ubuntu 二进制部署k8s 1.24版本
1.环境准备
1.1.集群信息
注：本次部署没有做master节点和node节点扩展操作，直接部署三主两从。
| IP地址 | 说明 | 软件 | |
|---|---|---|---|
| Master01 | 192.168.80.45 | master节点 | kube-apiserver、kube-controller-manager、kube-scheduler、etcd、 kubelet、kube-proxy、nfs-client、haproxy、keepalived |
| Master02 | 192.168.80.46 | master节点 | kube-apiserver、kube-controller-manager、kube-scheduler、etcd、 kubelet、kube-proxy、nfs-client、haproxy、keepalived |
| Master03 | 192.168.80.47 | master节点 | kube-apiserver、kube-controller-manager、kube-scheduler、etcd、 kubelet、kube-proxy、nfs-client、haproxy、keepalived |
| Node01 | 192.168.80.48 | node节点 | kubelet、kube-proxy、nfs-client |
| Node02 | 192.168.80.49 | node节点 | kubelet、kube-proxy、nfs-client |
| 192.168.80.100 | VIP |
系统相关版本：
| 软件 | 版本 |
|---|---|
| 内核 | Linux 5.19.0-35-generic x86_64 |
| 22.04 | |
| v1.24.14 | |
| v3.5.4 | |
| v1.6.18 | |
| v1.6.1 | |
| v1.1.1 | |
| v1.24.2 | |
| haproxy | 2.4.18-0ubuntu1.2 |
| keepalived |
网段
-
物理主机：192.168.80.0/24
-
service：10.96.0.0/12
-
pod：172.16.0.0/12
1.2.系统设置
-
所有节点执行一遍
这里先将ip地址的环境变量加入到~/.bashrc，这样就可以永久保存，因为是为了防止部署时配置的ip地址写错导致集群出现问题，还有环境变量添加只能执行一次因为是重定向到文件内。
cd ~
echo "K8S_MASTER01='192.168.80.45'" >> ~/.bashrc
echo "K8S_MASTER02='192.168.80.46'" >> ~/.bashrc
echo "K8S_MASTER03='192.168.80.47'" >> ~/.bashrc
echo "K8S_NODE01='192.168.80.48'" >> ~/.bashrc
echo "K8S_NODE02='192.168.80.49'" >> ~/.bashrc
echo "LOCALHOST=`hostname -I |awk '{print $1}'`" >> ~/.bashrc
echo "K8S_VIP='192.168.80.100'" >> ~/.bashrc
source ~/.bashrchostnamectl set-hostname k8s-master01
hostnamectl set-hostname k8s-master02
hostnamectl set-hostname k8s-master03
hostnamectl set-hostname k8s-node01
hostnamectl set-hostname k8s-node02清华源：https://mirrors.tuna.tsinghua.edu.cn/help/ubuntu，阿里源：
cp /etc/apt/sources.list /etc/apt/sources.list_bak
cat > /etc/apt/sources.list << EOF
deb http://mirrors.aliyun.com/ubuntu/ focal main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ focal main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ focal-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ focal-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ focal-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ focal-updates main restricted universe multiverse
# deb http://mirrors.aliyun.com/ubuntu/ focal-proposed main restricted universe multiverse
# deb-src http://mirrors.aliyun.com/ubuntu/ focal-proposed main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiverse
EOF
# 更新软件列表
sudo apt-get updateapt install net-tools nfs-kernel-server curl vim git lvm2 telnet htop jq lrzsz tree bash-completion telnet wget make -y
vim ~/.bashrc
# 去除注释
if [ -f /etc/bash_completion ] && ! shopt -oq posix; then
. /etc/bash_completion
fi
source ~/.bashrccat >> /etc/hosts << EOF
$K8S_MASTER01 k8s-master01
$K8S_MASTER02 k8s-master02
$K8S_MASTER03 k8s-master03
$K8S_NODE01 k8s-node01
$K8S_NODE02 k8s-node02
EOFswapoff -a && sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab
swapoff -a && sysctl -w vm.swappiness=0
cat /etc/fstab | grep swapLinux大全：https://www.linuxcool.com/chronyc
# 时间同步(服务端)
apt install chrony -y
cat > /etc/chrony.conf << EOF
pool ntp.aliyun.com iburst
driftfile /var/lib/chrony/drift
makestep 1.0 3
rtcsync
allow 192.168.80.0/24 #允许网段地址同步时间
local stratum 10
keyfile /etc/chrony.keys
leapsectz right/UTC
logdir /var/log/chrony
EOF
systemctl restart chronyd.service
systemctl enable chrony
# 时间同步(客户端)
apt install chrony -y
cat > /etc/chrony.conf << EOF
pool k8s-master01 iburst
driftfile /var/lib/chrony/drift
makestep 1.0 3
rtcsync
keyfile /etc/chrony.keys
leapsectz right/UTC
logdir /var/log/chrony
EOF
systemctl restart chronyd.service
systemctl enable chrony
#使用客户端进行验证
chronyc sources -v
#查看时间同步源的状态
chronyc sourcestats -v
# 查看系统时间与日期(全部机器)
ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
date -R
timedatectlulimit -SHn 65535
cat >> /etc/security/limits.conf <<EOF
* soft nofile 655360
* hard nofile 131072
* soft nproc 655350
* hard nproc 655350
* seft memlock unlimited
* hard memlock unlimitedd
EOF1.10.配置免密登录
apt install -y sshpass
ssh-keygen -f /root/.ssh/id_rsa -P ''
export IP="k8s-master01 k8s-master02 k8s-master03 k8s-node01 k8s-node02"
export SSHPASS=1qazZSE$
for HOST in $IP;do
sshpass -e ssh-copy-id -o StrictHostKeyChecking=no $HOST
donesudo apt-get upgrade linux-image-generic
dpkg --list | grep linux-image
uname -rapt install ipvsadm ipset sysstat conntrack -y
cat >> /etc/modules-load.d/ipvs.conf <<EOF
ip_vs
ip_vs_rr
ip_vs_wrr
ip_vs_sh
nf_conntrack
ip_tables
ip_set
xt_set
ipt_set
ipt_rpfilter
ipt_REJECT
ipip
EOF
systemctl restart systemd-modules-load.service
systemctl enable ipvsadm
lsmod | grep -e ip_vs -e nf_conntrack
ip_vs_sh 16384 0
ip_vs_wrr 16384 0
ip_vs_rr 16384 0
ip_vs 180224 6 ip_vs_rr,ip_vs_sh,ip_vs_wrr
nf_conntrack 176128 1 ip_vs
nf_defrag_ipv6 24576 2 nf_conntrack,ip_vs
nf_defrag_ipv4 16384 1 nf_conntrack
libcrc32c 16384 2 nf_conntrack,ip_vscat <<EOF > /etc/sysctl.d/k8s.conf
net.ipv4.ip_forward = 1
net.bridge.bridge-nf-call-iptables = 1
fs.may_detach_mounts = 1
vm.overcommit_memory=1
vm.panic_on_oom=0
fs.inotify.max_user_watches=89100
fs.file-max=52706963
fs.nr_open=52706963
net.netfilter.nf_conntrack_max=2310720
net.ipv4.tcp_keepalive_time = 600
net.ipv4.tcp_keepalive_probes = 3
net.ipv4.tcp_keepalive_intvl =15
net.ipv4.tcp_max_tw_buckets = 36000
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_max_orphans = 327680
net.ipv4.tcp_orphan_retries = 3
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_max_syn_backlog = 16384
net.ipv4.ip_conntrack_max = 65536
net.ipv4.tcp_max_syn_backlog = 16384
net.ipv4.tcp_timestamps = 0
net.core.somaxconn = 16384
net.ipv6.conf.all.disable_ipv6 = 0
net.ipv6.conf.default.disable_ipv6 = 0
net.ipv6.conf.lo.disable_ipv6 = 0
net.ipv6.conf.all.forwarding = 0
EOF
sysctl --systemapt install resolvconf
systemctl enable resolvconf.service
echo -e "nameserver 8.8.8.8\nnameserver 8.8.4.4" >> /etc/resolvconf/resolv.conf.d/head
systemctl start resolvconf.service
sudo systemctl restart resolvconf.service
sudo systemctl restart systemd-resolved.service
sudo systemctl status resolvconf.service
echo -e "nameserver 8.8.8.8\nnameserver 8.8.4.4" >> /etc/resolv.conf2.k8s基本组件安装
https://containerd.io/downloads
wget https://github.com/containernetworking/plugins/releases/download/v1.1.1/cni-plugins-linux-amd64-v1.1.1.tgz
#创建cni插件所需目录
mkdir -p /etc/cni/net.d /opt/cni/bin
#解压cni二进制包
tar xf cni-plugins-linux-amd64-v1.1.1.tgz -C /opt/cni/bin/
wget https://github.com/containerd/containerd/releases/download/v1.6.6/cri-containerd-cni-1.6.6-linux-amd64.tar.gz
#解压
tar -xzf cri-containerd-cni-*-linux-amd64.tar.gz -C /
rm -rf /etc/cni/net.d/10-containerd-net.conflist
#创建服务启动文件
cat > /etc/systemd/system/containerd.service <<EOF
[Unit]
Description=containerd container runtime
Documentation=https://containerd.io
After=network.target local-fs.target
[Service]
ExecStartPre=-/sbin/modprobe overlay
ExecStart=/usr/local/bin/containerd
Type=notify
Delegate=yes
KillMode=process
Restart=always
RestartSec=5
LimitNPROC=infinity
LimitCORE=infinity
LimitNOFILE=infinity
TasksMax=infinity
OOMScoreAdjust=-999
[Install]
WantedBy=multi-user.target
EOFcat <<EOF | sudo tee /etc/modules-load.d/containerd.conf
overlay
br_netfilter
EOFsystemctl restart systemd-modules-load.servicecat <<EOF | sudo tee /etc/sysctl.d/99-kubernetes-cri.conf
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.ip_forward = 1
net.bridge.bridge-nf-call-ip6tables = 1
EOF
# 加载内核
sysctl --systemmkdir -p /etc/containerd
containerd config default | tee /etc/containerd/config.toml
修改Containerd的配置文件
sed -i "s#SystemdCgroup\ \=\ false#SystemdCgroup\ \=\ true#g" /etc/containerd/config.toml
cat /etc/containerd/config.toml | grep SystemdCgroup
sed -i "s#k8s.gcr.io#registry.cn-hangzhou.aliyuncs.com/image-storage#g" /etc/containerd/config.toml
cat /etc/containerd/config.toml | grep sandbox_image
# 镜像加速
sed -i "s#config_path = \"\"#config_path = \"/etc/containerd/certs.d\"#g" /etc/containerd/config.toml
cat /etc/containerd/config.toml | grep config_path
mkdir /etc/containerd/certs.d/docker.io -pv
cat > /etc/containerd/certs.d/docker.io/hosts.toml << EOF
server = "https://docker.io"
[host."https://registry-1.docker.io"]
capabilities = ["pull", "resolve"]
[host."https://tlwy9ltd.mirror.aliyuncs.com"]
capabilities = ["pull", "resolve"]
[host."https://2lefsjdg.mirror.aliyuncs.com"]
capabilities = ["pull", "resolve"]
EOFsystemctl daemon-reload
systemctl enable --now containerd
systemctl restart containerd2.1.6配置crictl客户端连接的运行时位置
wget https://github.com/kubernetes-sigs/cri-tools/releases/download/v1.24.2/crictl-v1.24.2-linux-amd64.tar.gz
#解压
tar xf crictl-v1.24.2-linux-amd64.tar.gz -C /usr/bin/
#生成配置文件
cat > /etc/crictl.yaml <<EOF
runtime-endpoint: unix:///run/containerd/containerd.sock
image-endpoint: unix:///run/containerd/containerd.sock
timeout: 10
debug: false
EOF
#测试
systemctl restart containerd
crictl infonerdctl 也可以和 buildkit
# buildkit安装
wget https://github.com/moby/buildkit/releases/download/v0.11.6/buildkit-v0.11.6.linux-amd64.tar.gz
tar -zxvf buildkit-v0.11.6.linux-amd64.tar.gz --strip-components=1 bin/buildctl bin/buildkit-runc bin/buildkitd
mv buildctl buildkit-runc buildkitd /usr/local/bin
# https://github.com/moby/buildkit/tree/master/examples/systemd/system
cat > /usr/lib/systemd/system/buildkit.service <<EOF
[Unit]
Description=BuildKit
Requires=buildkit.socket
After=buildkit.socket
Documentation=https://github.com/moby/buildkit
[Service]
Type=notify
ExecStart=/usr/local/bin/buildkitd --oci-worker=false --containerd-worker=true
[Install]
WantedBy=multi-user.target
EOF
cat > /usr/lib/systemd/system/buildkit.socket <<EOF
[Unit]
Description=BuildKit
Documentation=https://github.com/moby/buildkit
[Socket]
ListenStream=%t/buildkit/buildkitd.sock
SocketMode=0660
[Install]
WantedBy=sockets.target
EOF
systemctl daemon-reload
systemctl enable --now buildkitnerdctl安装：
wget https://github.com/containerd/nerdctl/releases/download/v1.3.1/nerdctl-1.3.1-linux-amd64.tar.gz
mkdir -p /usr/local/containerd/bin && \
tar -zxvf nerdctl-1.3.1-linux-amd64.tar.gz nerdctl && \
mv nerdctl /usr/local/containerd/bin
ln -s /usr/local/containerd/bin/nerdctl /usr/bin/nerdctl
echo "source <(nerdctl completion bash)" >> /etc/profile
source /etc/profile
nerdctl version2.2.1解压k8s安装包
GitHub：https://github.com/kubernetes/kubernetes/tree/v1.24.14
华为国内地址：https://mirrors.huaweicloud.com/etcd/v3.5.4/etcd-v3.5.4-linux-amd64.tar.gz
GitHub：
# k8s二进制包
mkdir -p $HOME/k8s-install && cd $HOME/k8s-install
K8S_VERSION="v1.24.14"
wget https://dl.k8s.io/$K8S_VERSION/kubernetes-server-linux-amd64.tar.gz
tar -xf kubernetes-server-linux-amd64.tar.gz --strip-components=3 -C /usr/local/bin kubernetes/server/bin/kube{let,ctl,-apiserver,-controller-manager,-scheduler,-proxy}
#etcd二进制包
# Desc:
ETCDCTL_API=3
ETCD_VER=v3.5.4
ETCD_DIR=etcd-download
DOWNLOAD_URL=https://mirrors.huaweicloud.com/etcd
# Download
mkdir -p ${ETCD_DIR} && cd ${ETCD_DIR} && rm -rf etcd-${ETCD_VER}-linux-amd64.tar.gz etcd-${ETCD_VER}-linux-amd64
wget ${DOWNLOAD_URL}/${ETCD_VER}/etcd-${ETCD_VER}-linux-amd64.tar.gz
tar -xf etcd-v3.5.4-linux-amd64.tar.gz --strip-components=1 -C /usr/local/bin etcd-v3.5.4-linux-amd64/etcd{,ctl}
# 查看/usr/local/bin下内容
ls /usr/local/bin/
etcd etcdctl kube-apiserver kube-controller-manager kubectl kubelet kube-proxy kube-scheduler# kubelet --version
Kubernetes v1.24.14
# etcdctl version
etcdctl version: 3.5.4
API version: 3.5Master='k8s-master02 k8s-master03'
Work='k8s-node01 k8s-node02'
for NODE in $Master;
do
echo "正在传输的主机地址：$NODE ...";
scp /usr/local/bin/kube{let,ctl,-apiserver,-controller-manager,-scheduler,-proxy} $NODE:/usr/local/bin/;
scp /usr/local/bin/etcd* $NODE:/usr/local/bin/;
done
for NODE in $Work;
do
echo "正在传输的主机地址：$NODE ...";
scp /usr/local/bin/kube{let,-proxy,ctl} $NODE:/usr/local/bin/ ;
done
# 添加tab功能
apt install -y bash-completion
source /usr/share/bash-completion/bash_completion
source <(kubectl completion bash)
echo "source <(kubectl completion bash)" >> ~/.bashrc
source ~/.bashrcmkdir -p /root/k8s/ssl && cd /root/k8s/ssl
cat > admin-csr.json << EOF
{
"CN": "admin",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "Beijing",
"O": "system:masters",
"OU": "Kubernetes-manual"
}
]
}
EOF
cat > ca-config.json << EOF
{
"signing": {
"default": {
"expiry": "876000h"
},
"profiles": {
"kubernetes": {
"usages": [
"signing",
"key encipherment",
"server auth",
"client auth"
],
"expiry": "876000h"
}
}
}
}
EOF
cat > etcd-ca-csr.json << EOF
{
"CN": "etcd",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "Beijing",
"O": "etcd",
"OU": "Etcd Security"
}
],
"ca": {
"expiry": "876000h"
}
}
EOF
cat > front-proxy-ca-csr.json << EOF
{
"CN": "kubernetes",
"key": {
"algo": "rsa",
"size": 2048
},
"ca": {
"expiry": "876000h"
}
}
EOF
cat > kubelet-csr.json << EOF
{
"CN": "system:node:\$NODE",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"L": "Beijing",
"ST": "Beijing",
"O": "system:nodes",
"OU": "Kubernetes-manual"
}
]
}
EOF
cat > manager-csr.json << EOF
{
"CN": "system:kube-controller-manager",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "Beijing",
"O": "system:kube-controller-manager",
"OU": "Kubernetes-manual"
}
]
}
EOF
cat > apiserver-csr.json << EOF
{
"CN": "kube-apiserver",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "Beijing",
"O": "Kubernetes",
"OU": "Kubernetes-manual"
}
]
}
EOF
cat > ca-csr.json << EOF
{
"CN": "kubernetes",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "Beijing",
"O": "Kubernetes",
"OU": "Kubernetes-manual"
}
],
"ca": {
"expiry": "876000h"
}
}
EOF
cat > etcd-csr.json << EOF
{
"CN": "etcd",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "Beijing",
"O": "etcd",
"OU": "Etcd Security"
}
]
}
EOF
cat > front-proxy-client-csr.json << EOF
{
"CN": "front-proxy-client",
"key": {
"algo": "rsa",
"size": 2048
}
}
EOF
cat > kube-proxy-csr.json << EOF
{
"CN": "system:kube-proxy",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "Beijing",
"O": "system:kube-proxy",
"OU": "Kubernetes-manual"
}
]
}
EOF
cat > scheduler-csr.json << EOF
{
"CN": "system:kube-scheduler",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "Beijing",
"O": "system:kube-scheduler",
"OU": "Kubernetes-manual"
}
]
}
EOF
cd .. ; mkdir -p bootstrap ; cd bootstrap
cat > bootstrap.secret.yaml << EOF
apiVersion: v1
kind: Secret
metadata:
name: bootstrap-token-c8ad9c
namespace: kube-system
type: bootstrap.kubernetes.io/token
stringData:
description: "The default bootstrap token generated by 'kubelet '."
token-id: c8ad9c
token-secret: 2e4d610cf3e7426e
usage-bootstrap-authentication: "true"
usage-bootstrap-signing: "true"
auth-extra-groups: system:bootstrappers:default-node-token,system:bootstrappers:worker,system:bootstrappers:ingress
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: kubelet-bootstrap
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: system:node-bootstrapper
subjects:
- apiGroup: rbac.authorization.k8s.io
kind: Group
name: system:bootstrappers:default-node-token
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: node-autoapprove-bootstrap
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: system:certificates.k8s.io:certificatesigningrequests:nodeclient
subjects:
- apiGroup: rbac.authorization.k8s.io
kind: Group
name: system:bootstrappers:default-node-token
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: node-autoapprove-certificate-rotation
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: system:certificates.k8s.io:certificatesigningrequests:selfnodeclient
subjects:
- apiGroup: rbac.authorization.k8s.io
kind: Group
name: system:nodes
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
annotations:
rbac.authorization.kubernetes.io/autoupdate: "true"
labels:
kubernetes.io/bootstrapping: rbac-defaults
name: system:kube-apiserver-to-kubelet
rules:
- apiGroups:
- ""
resources:
- nodes/proxy
- nodes/stats
- nodes/log
- nodes/spec
- nodes/metrics
verbs:
- "*"
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: system:kube-apiserver
namespace: ""
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: system:kube-apiserver-to-kubelet
subjects:
- apiGroup: rbac.authorization.k8s.io
kind: User
name: kube-apiserver
EOF
cd .. ; mkdir -p coredns && cd coredns
cat > coredns.yaml << EOF
apiVersion: v1
kind: ServiceAccount
metadata:
name: coredns
namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
labels:
kubernetes.io/bootstrapping: rbac-defaults
name: system:coredns
rules:
- apiGroups:
- ""
resources:
- endpoints
- services
- pods
- namespaces
verbs:
- list
- watch
- apiGroups:
- discovery.k8s.io
resources:
- endpointslices
verbs:
- list
- watch
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
annotations:
rbac.authorization.kubernetes.io/autoupdate: "true"
labels:
kubernetes.io/bootstrapping: rbac-defaults
name: system:coredns
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: system:coredns
subjects:
- kind: ServiceAccount
name: coredns
namespace: kube-system
---
apiVersion: v1
kind: ConfigMap
metadata:
name: coredns
namespace: kube-system
data:
Corefile: |
.:53 {
errors
health {
lameduck 5s
}
ready
kubernetes cluster.local in-addr.arpa ip6.arpa {
fallthrough in-addr.arpa ip6.arpa
}
prometheus :9153
forward . /etc/resolv.conf {
max_concurrent 1000
}
cache 30
loop
reload
loadbalance
}
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: coredns
namespace: kube-system
labels:
k8s-app: kube-dns
kubernetes.io/name: "CoreDNS"
spec:
# replicas: not specified here:
# 1. Default is 1.
# 2. Will be tuned in real time if DNS horizontal auto-scaling is turned on.
strategy:
type: RollingUpdate
rollingUpdate:
maxUnavailable: 1
selector:
matchLabels:
k8s-app: kube-dns
template:
metadata:
labels:
k8s-app: kube-dns
spec:
priorityClassName: system-cluster-critical
serviceAccountName: coredns
tolerations:
- key: "CriticalAddonsOnly"
operator: "Exists"
nodeSelector:
kubernetes.io/os: linux
affinity:
podAntiAffinity:
preferredDuringSchedulingIgnoredDuringExecution:
- weight: 100
podAffinityTerm:
labelSelector:
matchExpressions:
- key: k8s-app
operator: In
values: ["kube-dns"]
topologyKey: kubernetes.io/hostname
containers:
- name: coredns
image: registry.cn-beijing.aliyuncs.com/dotbalo/coredns:1.8.6
imagePullPolicy: IfNotPresent
resources:
limits:
memory: 170Mi
requests:
cpu: 100m
memory: 70Mi
args: [ "-conf", "/etc/coredns/Corefile" ]
volumeMounts:
- name: config-volume
mountPath: /etc/coredns
readOnly: true
ports:
- containerPort: 53
name: dns
protocol: UDP
- containerPort: 53
name: dns-tcp
protocol: TCP
- containerPort: 9153
name: metrics
protocol: TCP
securityContext:
allowPrivilegeEscalation: false
capabilities:
add:
- NET_BIND_SERVICE
drop:
- all
readOnlyRootFilesystem: true
livenessProbe:
httpGet:
path: /health
port: 8080
scheme: HTTP
initialDelaySeconds: 60
timeoutSeconds: 5
successThreshold: 1
failureThreshold: 5
readinessProbe:
httpGet:
path: /ready
port: 8181
scheme: HTTP
dnsPolicy: Default
volumes:
- name: config-volume
configMap:
name: coredns
items:
- key: Corefile
path: Corefile
---
apiVersion: v1
kind: Service
metadata:
name: kube-dns
namespace: kube-system
annotations:
prometheus.io/port: "9153"
prometheus.io/scrape: "true"
labels:
k8s-app: kube-dns
kubernetes.io/cluster-service: "true"
kubernetes.io/name: "CoreDNS"
spec:
selector:
k8s-app: kube-dns
clusterIP: 10.96.0.10
ports:
- name: dns
port: 53
protocol: UDP
- name: dns-tcp
port: 53
protocol: TCP
- name: metrics
port: 9153
protocol: TCP
EOF# master01节点下载证书生成工具
wget "https://github.com/cloudflare/cfssl/releases/download/v1.6.1/cfssl_1.6.1_linux_amd64" -O /usr/local/bin/cfssl
wget "https://github.com/cloudflare/cfssl/releases/download/v1.6.1/cfssljson_1.6.1_linux_amd64" -O /usr/local/bin/cfssljson
chmod +x /usr/local/bin/cfssl*mkdir /etc/etcd/ssl -pmkdir -p /root/k8s/ssl && cd /root/k8s/ssl
# 生成etcd证书和etcd证书的key（如果你觉得以后可能会扩容，可以在ip那多写几个预留出来）
cfssl gencert -initca etcd-ca-csr.json | cfssljson -bare /etc/etcd/ssl/etcd-ca
cfssl gencert \
-ca=/etc/etcd/ssl/etcd-ca.pem \
-ca-key=/etc/etcd/ssl/etcd-ca-key.pem \
-config=ca-config.json \
-hostname=127.0.0.1,k8s-master01,k8s-master02,k8s-master03,$K8S_MASTER01,$K8S_MASTER02,$K8S_MASTER03 \
-profile=kubernetes \
etcd-csr.json | cfssljson -bare /etc/etcd/ssl/etcdMaster='k8s-master02 k8s-master03'
for NODE in $Master;
do
ssh $NODE "mkdir -p /etc/etcd/ssl";
for FILE in etcd-ca-key.pem etcd-ca.pem etcd-key.pem etcd.pem;
do
scp /etc/etcd/ssl/${FILE} $NODE:/etc/etcd/ssl/${FILE};
done;
done3.2.1所有k8s节点创建证书存放目录
mkdir -p /etc/kubernetes/pkicfssl gencert -initca ca-csr.json | cfssljson -bare /etc/kubernetes/pki/ca
# 生成一个根证书 ，多写了一些IP作为预留IP，为将来添加node做准备
# 10.96.0.1是service网段的第一个地址，需要计算，192.168.80.100为高可用vip地址
# 若没有IPv6 可删除可保留
cfssl gencert \
-ca=/etc/kubernetes/pki/ca.pem \
-ca-key=/etc/kubernetes/pki/ca-key.pem \
-config=ca-config.json \
-hostname=10.96.0.1,192.168.80.100,127.0.0.1,kubernetes,kubernetes.default,kubernetes.default.svc,kubernetes.default.svc.cluster,kubernetes.default.svc.cluster.local,192.168.80.45,192.168.80.46,192.168.80.47,192.168.80.48,192.168.80.49,192.168.80.50,192.168.80.51,192.168.80.52,192.168.80.53,192.168.80.54,10.0.0.40,10.0.0.41 \
-profile=kubernetes apiserver-csr.json | cfssljson -bare /etc/kubernetes/pki/apiserver
ls /etc/kubernetes/pki/apiserver*cfssl gencert -initca front-proxy-ca-csr.json | cfssljson -bare /etc/kubernetes/pki/front-proxy-ca
# 有一个警告，可以忽略
cfssl gencert \
-ca=/etc/kubernetes/pki/front-proxy-ca.pem \
-ca-key=/etc/kubernetes/pki/front-proxy-ca-key.pem \
-config=ca-config.json \
-profile=kubernetes front-proxy-client-csr.json | cfssljson -bare /etc/kubernetes/pki/front-proxy-clientcd /root/k8s/ssl
cfssl gencert \
-ca=/etc/kubernetes/pki/ca.pem \
-ca-key=/etc/kubernetes/pki/ca-key.pem \
-config=ca-config.json \
-profile=kubernetes \
kube-proxy-csr.json | cfssljson -bare /etc/kubernetes/pki/kube-proxy
kubectl config set-cluster kubernetes \
--certificate-authority=/etc/kubernetes/pki/ca.pem \
--embed-certs=true \
--server=https://$K8S_VIP:8443 \
--kubeconfig=/etc/kubernetes/kube-proxy.kubeconfig
kubectl config set-credentials kube-proxy \
--client-certificate=/etc/kubernetes/pki/kube-proxy.pem \
--client-key=/etc/kubernetes/pki/kube-proxy-key.pem \
--embed-certs=true \
--kubeconfig=/etc/kubernetes/kube-proxy.kubeconfig
kubectl config set-context kube-proxy@kubernetes \
--cluster=kubernetes \
--user=kube-proxy \
--kubeconfig=/etc/kubernetes/kube-proxy.kubeconfig
kubectl config use-context kube-proxy@kubernetes --kubeconfig=/etc/kubernetes/kube-proxy.kubeconfigcfssl gencert \
-ca=/etc/kubernetes/pki/ca.pem \
-ca-key=/etc/kubernetes/pki/ca-key.pem \
-config=ca-config.json \
-profile=kubernetes \
manager-csr.json | cfssljson -bare /etc/kubernetes/pki/controller-manager
# 设置一个集群项
kubectl config set-cluster kubernetes \
--certificate-authority=/etc/kubernetes/pki/ca.pem \
--embed-certs=true \
--server=https://$K8S_VIP:8443 \
--kubeconfig=/etc/kubernetes/controller-manager.kubeconfig
# 设置一个环境项，一个上下文
kubectl config set-context system:kube-controller-manager@kubernetes \
--cluster=kubernetes \
--user=system:kube-controller-manager \
--kubeconfig=/etc/kubernetes/controller-manager.kubeconfig
# 设置一个用户项
kubectl config set-credentials system:kube-controller-manager \
--client-certificate=/etc/kubernetes/pki/controller-manager.pem \
--client-key=/etc/kubernetes/pki/controller-manager-key.pem \
--embed-certs=true \
--kubeconfig=/etc/kubernetes/controller-manager.kubeconfig
# 设置默认环境
kubectl config use-context system:kube-controller-manager@kubernetes \
--kubeconfig=/etc/kubernetes/controller-manager.kubeconfig
cfssl gencert \
-ca=/etc/kubernetes/pki/ca.pem \
-ca-key=/etc/kubernetes/pki/ca-key.pem \
-config=ca-config.json \
-profile=kubernetes \
scheduler-csr.json | cfssljson -bare /etc/kubernetes/pki/scheduler
kubectl config set-cluster kubernetes \
--certificate-authority=/etc/kubernetes/pki/ca.pem \
--embed-certs=true \
--server=https://$K8S_VIP:8443 \
--kubeconfig=/etc/kubernetes/scheduler.kubeconfig
kubectl config set-credentials system:kube-scheduler \
--client-certificate=/etc/kubernetes/pki/scheduler.pem \
--client-key=/etc/kubernetes/pki/scheduler-key.pem \
--embed-certs=true \
--kubeconfig=/etc/kubernetes/scheduler.kubeconfig
kubectl config set-context system:kube-scheduler@kubernetes \
--cluster=kubernetes \
--user=system:kube-scheduler \
--kubeconfig=/etc/kubernetes/scheduler.kubeconfig
kubectl config use-context system:kube-scheduler@kubernetes \
--kubeconfig=/etc/kubernetes/scheduler.kubeconfig
cfssl gencert \
-ca=/etc/kubernetes/pki/ca.pem \
-ca-key=/etc/kubernetes/pki/ca-key.pem \
-config=ca-config.json \
-profile=kubernetes \
admin-csr.json | cfssljson -bare /etc/kubernetes/pki/admin
kubectl config set-cluster kubernetes \
--certificate-authority=/etc/kubernetes/pki/ca.pem \
--embed-certs=true \
--server=https://$K8S_VIP:8443 \
--kubeconfig=/etc/kubernetes/admin.kubeconfig
kubectl config set-credentials kubernetes-admin \
--client-certificate=/etc/kubernetes/pki/admin.pem \
--client-key=/etc/kubernetes/pki/admin-key.pem \
--embed-certs=true \
--kubeconfig=/etc/kubernetes/admin.kubeconfig
kubectl config set-context kubernetes-admin@kubernetes \
--cluster=kubernetes \
--user=kubernetes-admin \
--kubeconfig=/etc/kubernetes/admin.kubeconfig
kubectl config use-context kubernetes-admin@kubernetes --kubeconfig=/etc/kubernetes/admin.kubeconfigopenssl genrsa -out /etc/kubernetes/pki/sa.key 2048
openssl rsa -in /etc/kubernetes/pki/sa.key -pubout -out /etc/kubernetes/pki/sa.pubfor NODE in k8s-master02 k8s-master03;
do
for FILE in $(ls /etc/kubernetes/pki | grep -v etcd);
do
ssh $NODE "mkdir -p /etc/kubernetes/pki"
scp /etc/kubernetes/pki/${FILE} $NODE:/etc/kubernetes/pki/${FILE};
done;
for FILE in admin.kubeconfig controller-manager.kubeconfig scheduler.kubeconfig kube-proxy.kubeconfig;
do
ssh $NODE "mkdir -p /etc/kubernetes"
scp /etc/kubernetes/${FILE} $NODE:/etc/kubernetes/${FILE};
done;
donels /etc/kubernetes/pki/
admin.csr apiserver-key.pem ca.pem etcd front-proxy-client.csr kubelet.key sa.key scheduler.pem
admin-key.pem apiserver.pem controller-manager.csr front-proxy-ca.csr front-proxy-client-key.pem kube-proxy.csr sa.pub
admin.pem ca.csr controller-manager-key.pem front-proxy-ca-key.pem front-proxy-client.pem kube-proxy-key.pem scheduler.csr
apiserver.csr ca-key.pem controller-manager.pem front-proxy-ca.pem kubelet.crt kube-proxy.pem scheduler-key.pem
ls /etc/kubernetes/pki/ | wc -l
294.k8s系统组件配置
-
所有master节点操作
添加环境变量：
cd ~
if [ $LOCALHOST == $K8S_MASTER01 ];then
echo "etcd='k8s-etcd01'" >> ~/.bashrc
elif [ $LOCALHOST == $K8S_MASTER02 ];then
echo "etcd='k8s-etcd02'" >> ~/.bashrc
elif [ $LOCALHOST == $K8S_MASTER03 ];then
echo "etcd='k8s-etcd03'" >> ~/.bashrc
fi
source ~/.bashrc配置etcd
cat > /etc/etcd/etcd.config.yml << EOF
name: $etcd
data-dir: /var/lib/etcd
wal-dir: /var/lib/etcd/wal
snapshot-count: 5000
heartbeat-interval: 100
election-timeout: 1000
quota-backend-bytes: 0
listen-peer-urls: "https://$LOCALHOST:2380"
listen-client-urls: "https://$LOCALHOST:2379,http://127.0.0.1:2379"
max-snapshots: 3
max-wals: 5
cors:
initial-advertise-peer-urls: "https://$LOCALHOST:2380"
advertise-client-urls: "https://$LOCALHOST:2379"
discovery:
discovery-fallback: 'proxy'
discovery-proxy:
discovery-srv:
initial-cluster: "k8s-etcd01=https://$K8S_MASTER01:2380,k8s-etcd02=https://$K8S_MASTER02:2380,k8s-etcd03=https://$K8S_MASTER03:2380"
initial-cluster-token: 'etcd-k8s-cluster'
initial-cluster-state: 'new'
strict-reconfig-check: false
enable-v2: true
enable-pprof: true
proxy: 'off'
proxy-failure-wait: 5000
proxy-refresh-interval: 30000
proxy-dial-timeout: 1000
proxy-write-timeout: 5000
proxy-read-timeout: 0
client-transport-security:
cert-file: '/etc/kubernetes/pki/etcd/etcd.pem'
key-file: '/etc/kubernetes/pki/etcd/etcd-key.pem'
client-cert-auth: true
trusted-ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem'
auto-tls: true
peer-transport-security:
cert-file: '/etc/kubernetes/pki/etcd/etcd.pem'
key-file: '/etc/kubernetes/pki/etcd/etcd-key.pem'
peer-client-cert-auth: true
trusted-ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem'
auto-tls: true
debug: false
log-package-levels:
log-outputs: [default]
force-new-cluster: false
EOF4.2.创建service（所有master节点操作）
cat > /usr/lib/systemd/system/etcd.service << EOF
[Unit]
Description=Etcd Service
Documentation=https://coreos.com/etcd/docs/latest/
After=network.target
[Service]
Type=notify
ExecStart=/usr/local/bin/etcd --config-file=/etc/etcd/etcd.config.yml
Restart=on-failure
RestartSec=10
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
Alias=etcd3.service
EOFmkdir /etc/kubernetes/pki/etcd
ln -s /etc/etcd/ssl/* /etc/kubernetes/pki/etcd/
systemctl daemon-reload
systemctl enable --now etcdinfo。
export ETCDCTL_API=3
etcdctl --endpoints="$K8S_MASTER01:2379,$K8S_MASTER02:2379,$K8S_MASTER03:2379" --cacert=/etc/kubernetes/pki/etcd/etcd-ca.pem --cert=/etc/kubernetes/pki/etcd/etcd.pem --key=/etc/kubernetes/pki/etcd/etcd-key.pem endpoint status --write-out=table
+--------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
| ENDPOINT | ID | VERSION | DB SIZE | IS LEADER | IS LEARNER | RAFT TERM | RAFT INDEX | RAFT APPLIED INDEX | ERRORS |
+--------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
| 192.168.80.45:2379 | aeceb08f95191d44 | 3.5.4 | 20 kB | true | false | 2 | 9 | 9 | |
| 192.168.80.46:2379 | e33e882bc326495d | 3.5.4 | 20 kB | false | false | 2 | 9 | 9 | |
| 192.168.80.47:2379 | c39d0bf63332ca37 | 3.5.4 | 20 kB | false | false | 2 | 9 | 9 | |
+--------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+5.高可用配置
5.1.在master01和master02和master03服务器上操作
apt -y install keepalived haproxy# cp /etc/haproxy/haproxy.cfg /etc/haproxy/haproxy.cfg.bak
cat > /etc/haproxy/haproxy.cfg << EOF
global
maxconn 2000
ulimit-n 16384
log 127.0.0.1 local0 err
stats timeout 30s
defaults
log global
mode http
option httplog
timeout connect 5000
timeout client 50000
timeout server 50000
timeout http-request 15s
timeout http-keep-alive 15s
frontend monitor-in
bind *:33305
mode http
option httplog
monitor-uri /monitor
frontend k8s-master
bind 0.0.0.0:8443
bind 127.0.0.1:8443
mode tcp
option tcplog
tcp-request inspect-delay 5s
default_backend k8s-master
backend k8s-master
mode tcp
option tcplog
option tcp-check
balance roundrobin
default-server inter 10s downinter 5s rise 2 fall 2 slowstart 60s maxconn 250 maxqueue 256 weight 100
server k8s-master01 $K8S_MASTER01:6443 check
server k8s-master02 $K8S_MASTER02:6443 check
server k8s-master03 $K8S_MASTER03:6443 check
EOF5.1.3Master01配置keepalived master节点
注：这里keepalived使用的是非抢占模式：priority id
if [ $LOCALHOST == $K8S_MASTER01 ];then
export PRIORITY="100"
elif [ $LOCALHOST == $K8S_MASTER02 ];then
export PRIORITY="80"
elif [ $LOCALHOST == $K8S_MASTER03 ];then
export PRIORITY="50"
fi
#cp /etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf.bak
cat > /etc/keepalived/keepalived.conf << EOF
! Configuration File for keepalived
global_defs {
router_id LVS_DEVEL
}
vrrp_script chk_apiserver {
script "/etc/keepalived/check_apiserver.sh"
interval 5
weight -5
fall 2
rise 1
}
vrrp_instance VI_1 {
state MASTER
# 注意网卡名
interface ens33
mcast_src_ip $LOCALHOST
virtual_router_id 51
priority $PRIORITY
nopreempt
advert_int 2
authentication {
auth_type PASS
auth_pass K8SHA_KA_AUTH
}
virtual_ipaddress {
$K8S_VIP
}
track_script {
chk_apiserver
} }
EOFcat > /etc/keepalived/check_apiserver.sh << EOF
#!/bin/bash
err=0
for k in \$(seq 1 3)
do
check_code=\$(pgrep haproxy)
if [[ \$check_code == "" ]]; then
err=\$(expr \$err + 1)
sleep 1
continue
else
err=0
break
fi
done
if [[ \$err != "0" ]]; then
echo "systemctl stop keepalived"
/usr/bin/systemctl stop keepalived
exit 1
else
exit 0
fi
EOF
# 给脚本授权
chmod +x /etc/keepalived/check_apiserver.shsystemctl daemon-reload
systemctl enable --now haproxy
systemctl enable --now keepalived
systemctl restart haproxy.service && netstat -lntup | grep 4435.1.6测试高可用
ping 192.168.80.100
# 关闭主节点，看vip是否漂移到备节点注：现在apiserver还有创建，所以先不telnet8443端口，因为负载不到6443端口。
6.k8s组件配置（区别于第4点）
6.1.创建apiserver
6.1.1准备目录
所有k8s节点创建以下目录
mkdir -p /etc/kubernetes/manifests/ /etc/systemd/system/kubelet.service.d /var/lib/kubelet /var/log/kubernetes--service-cluster-ip-range=10.96.0.0/12: Service IP 段
cat > /usr/lib/systemd/system/kube-apiserver.service << EOF
[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/kubernetes/kubernetes
After=network.target
[Service]
ExecStart=/usr/local/bin/kube-apiserver \\
--v=2 \\
--logtostderr=true \\
--allow-privileged=true \\
--bind-address=0.0.0.0 \\
--secure-port=6443 \\
--advertise-address=$LOCALHOST \\
--service-cluster-ip-range=10.96.0.0/12,fd00::/108 \\
--service-node-port-range=30000-32767 \\
--etcd-servers=https://$K8S_MASTER01:2379,https://$K8S_MASTER02:2379,https://$K8S_MASTER03:2379 \\
--etcd-cafile=/etc/etcd/ssl/etcd-ca.pem \\
--etcd-certfile=/etc/etcd/ssl/etcd.pem \\
--etcd-keyfile=/etc/etcd/ssl/etcd-key.pem \\
--client-ca-file=/etc/kubernetes/pki/ca.pem \\
--tls-cert-file=/etc/kubernetes/pki/apiserver.pem \\
--tls-private-key-file=/etc/kubernetes/pki/apiserver-key.pem \\
--kubelet-client-certificate=/etc/kubernetes/pki/apiserver.pem \\
--kubelet-client-key=/etc/kubernetes/pki/apiserver-key.pem \\
--service-account-key-file=/etc/kubernetes/pki/sa.pub \\
--service-account-signing-key-file=/etc/kubernetes/pki/sa.key \\
--service-account-issuer=https://kubernetes.default.svc.cluster.local \\
--kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname \\
--enable-admission-plugins=NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,DefaultTolerationSeconds,NodeRestriction,ResourceQuota \\
--authorization-mode=Node,RBAC \\
--enable-bootstrap-token-auth=true \\
--requestheader-client-ca-file=/etc/kubernetes/pki/front-proxy-ca.pem \\
--proxy-client-cert-file=/etc/kubernetes/pki/front-proxy-client.pem \\
--proxy-client-key-file=/etc/kubernetes/pki/front-proxy-client-key.pem \\
--requestheader-allowed-names=aggregator \\
--requestheader-group-headers=X-Remote-Group \\
--requestheader-extra-headers-prefix=X-Remote-Extra- \\
--requestheader-username-headers=X-Remote-User \\
--enable-aggregator-routing=true
#--feature-gates=IPv6DualStack=true
Restart=on-failure
RestartSec=10s
LimitNOFILE=65535
[Install]
WantedBy=multi-user.target
EOF注：在1.24+ 版本中已经遗弃了 --insecure-port、–enable-swagger-ui 这两个参数。
systemctl daemon-reload && systemctl enable --now kube-apiserver
journalctl -u kube-apiserver
# 注意查看状态是否启动正常
systemctl status kube-apiserver
netstat -lntup | grep 6443
#测试haproxy 8443端口
telnet 192.168.80.100 8443
Trying 192.168.80.100...
Connected to 192.168.80.100.
Escape character is '^]'.# 所有master节点配置，且配置相同
# 172.16.0.0/12为pod网段，按需求设置你自己的网段
cat > /usr/lib/systemd/system/kube-controller-manager.service << EOF
[Unit]
Description=Kubernetes Controller Manager
Documentation=https://github.com/kubernetes/kubernetes
After=network.target
[Service]
ExecStart=/usr/local/bin/kube-controller-manager \\
--v=2 \\
--logtostderr=true \\
--bind-address=127.0.0.1 \\
--root-ca-file=/etc/kubernetes/pki/ca.pem \\
--cluster-signing-cert-file=/etc/kubernetes/pki/ca.pem \\
--cluster-signing-key-file=/etc/kubernetes/pki/ca-key.pem \\
--service-account-private-key-file=/etc/kubernetes/pki/sa.key \\
--kubeconfig=/etc/kubernetes/controller-manager.kubeconfig \\
--leader-elect=true \\
--use-service-account-credentials=true \\
--node-monitor-grace-period=40s \\
--node-monitor-period=5s \\
--pod-eviction-timeout=2m0s \\
--controllers=*,bootstrapsigner,tokencleaner \\
--allocate-node-cidrs=true \\
--service-cluster-ip-range=10.96.0.0/12,fd00::/108 \\
--cluster-cidr=172.16.0.0/12,fc00::/48 \\
--node-cidr-mask-size-ipv4=24 \\
--node-cidr-mask-size-ipv6=64 \\
--requestheader-client-ca-file=/etc/kubernetes/pki/front-proxy-ca.pem
#--feature-gates=IPv6DualStack=true
Restart=always
RestartSec=10s
[Install]
WantedBy=multi-user.target
EOF要是没有配置ipv6就不要打开，打开会出现 Get "http://127.0.0.1:10252/healthz
6.2.1启动kube-controller-manager，并查看状态
systemctl daemon-reload
systemctl enable --now kube-controller-manager
systemctl status kube-controller-managercat > /usr/lib/systemd/system/kube-scheduler.service << EOF
[Unit]
Description=Kubernetes Scheduler
Documentation=https://github.com/kubernetes/kubernetes
After=network.target
[Service]
ExecStart=/usr/local/bin/kube-scheduler \\
--v=2 \\
--logtostderr=true \\
--bind-address=127.0.0.1 \\
--leader-elect=true \\
--kubeconfig=/etc/kubernetes/scheduler.kubeconfig
Restart=always
RestartSec=10s
[Install]
WantedBy=multi-user.target
EOFsystemctl daemon-reload
systemctl enable --now kube-scheduler
systemctl status kube-scheduler7.1.在master01上配置
kubectl config set-cluster kubernetes \
--certificate-authority=/etc/kubernetes/pki/ca.pem \
--embed-certs=true \
--server=https://$K8S_VIP:8443 \
--kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig
kubectl config set-credentials tls-bootstrap-token-user \
--token=c8ad9c.2e4d610cf3e7426e \
--kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig
kubectl config set-context tls-bootstrap-token-user@kubernetes \
--cluster=kubernetes \
--user=tls-bootstrap-token-user \
--kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig
kubectl config use-context tls-bootstrap-token-user@kubernetes \
--kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig
# token的位置在bootstrap.secret.yaml，如果修改的话到这个文件修改
mkdir -p /root/.kube ; cp /etc/kubernetes/admin.kubeconfig /root/.kube/config
for NODE in k8s-master02 k8s-master03 k8s-node01 k8s-node02;
do
ssh $NODE "mkdir -p /root/.kube"
scp /root/.kube/config $NODE:/root/.kube
done7.2.查看集群状态，没问题的话继续后续操作
kubectl get cs
Warning: v1 ComponentStatus is deprecated in v1.19+
NAME STATUS MESSAGE ERROR
scheduler Healthy ok
controller-manager Healthy ok
etcd-0 Healthy {"health":"true","reason":""}
etcd-2 Healthy {"health":"true","reason":""}
etcd-1 Healthy {"health":"true","reason":""}
cd /root/k8s/bootstrap
kubectl create -f bootstrap.secret.yamlcd /etc/kubernetes/
for NODE in k8s-master02 k8s-master03 k8s-node01 k8s-node02;
do
ssh $NODE mkdir -p /etc/kubernetes/pki;
for FILE in pki/ca.pem pki/ca-key.pem pki/front-proxy-ca.pem bootstrap-kubelet.kubeconfig;
do
scp /etc/kubernetes/$FILE $NODE:/etc/kubernetes/${FILE};
done;
done8.2.1当使用Containerd作为Runtime
# 所有k8s节点配置kubelet service
cat > /usr/lib/systemd/system/kubelet.service << EOF
[Unit]
Description=Kubernetes Kubelet
Documentation=https://github.com/kubernetes/kubernetes
After=containerd.service
Requires=containerd.service
[Service]
ExecStart=/usr/local/bin/kubelet \\
--bootstrap-kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig \\
--kubeconfig=/etc/kubernetes/kubelet.kubeconfig \\
--config=/etc/kubernetes/kubelet-conf.yml \\
--container-runtime=remote \\
--runtime-request-timeout=15m \\
--container-runtime-endpoint=unix:///run/containerd/containerd.sock \\
--cgroup-driver=systemd \\
--node-labels=node.kubernetes.io/node=
# --feature-gates=IPv6DualStack=true
[Install]
WantedBy=multi-user.target
EOFcat > /etc/kubernetes/kubelet-conf.yml <<EOF
apiVersion: kubelet.config.k8s.io/v1beta1
kind: KubeletConfiguration
address: 0.0.0.0
port: 10250
readOnlyPort: 10255
authentication:
anonymous:
enabled: false
webhook:
cacheTTL: 2m0s
enabled: true
x509:
clientCAFile: /etc/kubernetes/pki/ca.pem
authorization:
mode: Webhook
webhook:
cacheAuthorizedTTL: 5m0s
cacheUnauthorizedTTL: 30s
cgroupDriver: systemd
cgroupsPerQOS: true
clusterDNS:
- 10.96.0.10
clusterDomain: cluster.local
containerLogMaxFiles: 5
containerLogMaxSize: 10Mi
contentType: application/vnd.kubernetes.protobuf
cpuCFSQuota: true
cpuManagerPolicy: none
cpuManagerReconcilePeriod: 10s
enableControllerAttachDetach: true
enableDebuggingHandlers: true
enforceNodeAllocatable:
- pods
eventBurst: 10
eventRecordQPS: 5
evictionHard:
imagefs.available: 15%
memory.available: 100Mi
nodefs.available: 10%
nodefs.inodesFree: 5%
evictionPressureTransitionPeriod: 5m0s
failSwapOn: true
fileCheckFrequency: 20s
hairpinMode: promiscuous-bridge
healthzBindAddress: 127.0.0.1
healthzPort: 10248
httpCheckFrequency: 20s
imageGCHighThresholdPercent: 85
imageGCLowThresholdPercent: 80
imageMinimumGCAge: 2m0s
iptablesDropBit: 15
iptablesMasqueradeBit: 14
kubeAPIBurst: 10
kubeAPIQPS: 5
makeIPTablesUtilChains: true
maxOpenFiles: 1000000
maxPods: 110
nodeStatusUpdateFrequency: 10s
oomScoreAdj: -999
podPidsLimit: -1
registryBurst: 10
registryPullQPS: 5
resolvConf: /etc/resolv.conf
rotateCertificates: true
runtimeRequestTimeout: 2m0s
serializeImagePulls: true
staticPodPath: /etc/kubernetes/manifests
streamingConnectionIdleTimeout: 4h0m0s
syncFrequency: 1m0s
volumeStatsAggPeriod: 1m0s
EOFsystemctl daemon-reload
systemctl restart kubelet
systemctl enable --now kubelet
# systemctl status kubelet.servicecat > /usr/lib/systemd/system/kube-proxy.service << EOF
[Unit]
Description=Kubernetes Kube Proxy
Documentation=https://github.com/kubernetes/kubernetes
After=network.target
[Service]
ExecStart=/usr/local/bin/kube-proxy \\
--config=/etc/kubernetes/kube-proxy.yaml \\
--v=2
Restart=always
RestartSec=10s
[Install]
WantedBy=multi-user.target
EOFcat > /etc/kubernetes/kube-proxy.yaml << EOF
apiVersion: kubeproxy.config.k8s.io/v1alpha1
bindAddress: 0.0.0.0
clientConnection:
acceptContentTypes: ""
burst: 10
contentType: application/vnd.kubernetes.protobuf
kubeconfig: /etc/kubernetes/kube-proxy.kubeconfig
qps: 5
clusterCIDR: 172.16.0.0/12,fc00::/48
configSyncPeriod: 15m0s
conntrack:
max: null
maxPerCore: 32768
min: 131072
tcpCloseWaitTimeout: 1h0m0s
tcpEstablishedTimeout: 24h0m0s
enableProfiling: false
healthzBindAddress: 0.0.0.0:10256
hostnameOverride: ""
iptables:
masqueradeAll: false
masqueradeBit: 14
minSyncPeriod: 0s
syncPeriod: 30s
ipvs:
masqueradeAll: true
minSyncPeriod: 5s
scheduler: "rr"
syncPeriod: 30s
kind: KubeProxyConfiguration
metricsBindAddress: 127.0.0.1:10249
mode: "ipvs"
nodePortAddresses: null
oomScoreAdj: -999
portRange: ""
udpIdleTimeout: 250ms
EOF8.3.3启动kube-proxy
systemctl daemon-reload
systemctl enable --now kube-proxy
systemctl restart kube-proxy
netstat -lntup | grep 10249
# 查看当前使用是默认是iptables或ipvs
curl localhost:10249/proxyMode9.1安装Calico
注意对应的版本：https://docs.tigera.io/archive/v3.25/getting-started/kubernetes/requirements
mkdir -p $HOME/k8s-install/network && cd $HOME/k8s-install/network
# 1. 下载插件
curl https://docs.tigera.io/archive/v3.25/manifests/calico.yaml -O
# CIDR的值，与 kube-controller-manager中“--cluster-cidr=172.16.0.0/16” 一致
cat calico.yaml | grep -A 5 CALICO_IPV4POOL_CIDR
- name: CALICO_IPV4POOL_CIDR
value: "172.16.0.0/16"
- name: IP_AUTODETECTION_METHOD
value: "interface=ens33" # 指定网卡
# Disable file logging so `kubectl logs` works.
- name: CALICO_DISABLE_FILE_LOGGING
kubectl apply -f calico.yaml
kubectl get pod -n kube-system
NAME READY STATUS RESTARTS AGE
calico-kube-controllers-55fc758c88-7b65k 1/1 Running 0 40m
calico-node-bnkqh 1/1 Running 0 40m
calico-node-djxn2 1/1 Running 1 (17m ago) 40m
calico-node-n4x9q 1/1 Running 0 40m
calico-node-spqbf 1/1 Running 0 32m
calico-node-sw485 1/1 Running 0 40mk8s对比： 镜像地址：
官网：https://github.com/coredns/deployment/tree/master/kubernetes 文档参考：
参考：
apiVersion: v1
kind: ServiceAccount
metadata:
name: coredns
namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
labels:
kubernetes.io/bootstrapping: rbac-defaults
name: system:coredns
rules:
- apiGroups:
- ""
resources:
- endpoints
- services
- pods
- namespaces
verbs:
- list
- watch
- apiGroups:
- discovery.k8s.io
resources:
- endpointslices
verbs:
- list
- watch
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
annotations:
rbac.authorization.kubernetes.io/autoupdate: "true"
labels:
kubernetes.io/bootstrapping: rbac-defaults
name: system:coredns
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: system:coredns
subjects:
- kind: ServiceAccount
name: coredns
namespace: kube-system
---
apiVersion: v1
kind: ConfigMap
metadata:
name: coredns
namespace: kube-system
data:
Corefile: |
.:53 {
log
errors
health {
lameduck 5s
}
ready
kubernetes cluster.local in-addr.arpa ip6.arpa {
fallthrough in-addr.arpa ip6.arpa
}
prometheus :9153
forward . /etc/resolv.conf {
max_concurrent 1000
}
cache 30
loop
reload
loadbalance
}
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: coredns
namespace: kube-system
labels:
k8s-app: kube-dns
kubernetes.io/name: "CoreDNS"
app.kubernetes.io/name: coredns
spec:
# replicas: not specified here:
# 1. Default is 1.
# 2. Will be tuned in real time if DNS horizontal auto-scaling is turned on.
strategy:
type: RollingUpdate
rollingUpdate:
maxUnavailable: 1
selector:
matchLabels:
k8s-app: kube-dns
app.kubernetes.io/name: coredns
template:
metadata:
labels:
k8s-app: kube-dns
app.kubernetes.io/name: coredns
spec:
priorityClassName: system-cluster-critical
serviceAccountName: coredns
tolerations:
- key: "CriticalAddonsOnly"
operator: "Exists"
nodeSelector:
kubernetes.io/os: linux
affinity:
podAntiAffinity:
requiredDuringSchedulingIgnoredDuringExecution:
- labelSelector:
matchExpressions:
- key: k8s-app
operator: In
values: ["kube-dns"]
topologyKey: kubernetes.io/hostname
containers:
- name: coredns
image: coredns/coredns:1.8.5 #对比下与本地k8s版本是否符合
imagePullPolicy: IfNotPresent
resources:
limits:
memory: 170Mi
requests:
cpu: 100m
memory: 70Mi
args: [ "-conf", "/etc/coredns/Corefile" ]
volumeMounts:
- name: config-volume
mountPath: /etc/coredns
readOnly: true
ports:
- containerPort: 53
name: dns
protocol: UDP
- containerPort: 53
name: dns-tcp
protocol: TCP
- containerPort: 9153
name: metrics
protocol: TCP
securityContext:
allowPrivilegeEscalation: false
capabilities:
add:
- NET_BIND_SERVICE
drop:
- all
readOnlyRootFilesystem: true
livenessProbe:
httpGet:
path: /health
port: 8080
scheme: HTTP
initialDelaySeconds: 60
timeoutSeconds: 5
successThreshold: 1
failureThreshold: 5
readinessProbe:
httpGet:
path: /ready
port: 8181
scheme: HTTP
dnsPolicy: Default
volumes:
- name: config-volume
configMap:
name: coredns
items:
- key: Corefile
path: Corefile
---
apiVersion: v1
kind: Service
metadata:
name: kube-dns
namespace: kube-system
annotations:
prometheus.io/port: "9153"
prometheus.io/scrape: "true"
labels:
k8s-app: kube-dns
kubernetes.io/cluster-service: "true"
kubernetes.io/name: "CoreDNS"
app.kubernetes.io/name: coredns
spec:
selector:
k8s-app: kube-dns
app.kubernetes.io/name: coredns
clusterIP: 10.96.0.10 #这里改成自己的clusterDNS
ports:
- name: dns
port: 53
protocol: UDP
- name: dns-tcp
port: 53
protocol: TCP
- name: metrics
port: 9153
protocol: TCP启动容器：
# 启动文件
kubectl apply -f coredns.yaml
#查看pod情况
kubectl get pod -n kube-system -l k8s-app=kube-dns
coredns-857d6b74c4-tn59p 1/1 Running 0 95s
# 查看集群
kubectl get node
NAME STATUS ROLES AGE VERSION
192.168.80.45 Ready <none> 59m v1.22.17
192.168.80.46 Ready <none> 55m v1.22.17
192.168.80.47 Ready <none> 55m v1.22.17
192.168.80.48 Ready <none> 55m v1.22.17
192.168.80.49 Ready <none> 55m v1.22.17GitHub：https://github.com/kubernetes-sigs/metrics-server
helm：
wget https://github.com/kubernetes-sigs/metrics-server/releases/download/v0.6.3/components.yaml
sed -i s#registry.k8s.io/metrics-server/metrics-server:v0.6.3#registry.cn-hangzhou.aliyuncs.com/image-storage/metrics-server:v0.6.3#g components.yaml
# 参数部分
containers:
- args:
- --cert-dir=/tmp
- --secure-port=4443
- --kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname
- --kubelet-use-node-status-port
- --metric-resolution=15s
- --kubelet-insecure-tls
- --requestheader-client-ca-file=/etc/kubernetes/pki/front-proxy-ca.pem
- --requestheader-username-headers=X-Remote-User
- --requestheader-group-headers=X-Remote-Group
- --requestheader-extra-headers-prefix=X-Remote-Extra-
image: registry.cn-hangzhou.aliyuncs.com/image-storage/metrics-server:v0.6.3
imagePullPolicy: IfNotPresent
# 挂载部分
volumeMounts:
- mountPath: /tmp
name: tmp-dir
- name: ca-ssl
mountPath: /etc/kubernetes/pki
nodeSelector:
kubernetes.io/os: linux
priorityClassName: system-cluster-critical
serviceAccountName: metrics-server
volumes:
- emptyDir: {}
name: tmp-dir
- name: ca-ssl
hostPath:
path: /etc/kubernetes/pki
kubectl apply -f components.yamlkubectl top node
NAME CPU(cores) CPU% MEMORY(bytes) MEMORY%
k8s-master01 301m 15% 3187Mi 84%
k8s-master02 286m 14% 3148Mi 83%
k8s-master03 299m 14% 3037Mi 80%
k8s-node01 133m 6% 2618Mi 69%
k8s-node02 182m 9% 2568Mi 67%12.集群验证
cat<<EOF | kubectl apply -f -
apiVersion: v1
kind: Pod
metadata:
name: busybox
namespace: default
spec:
containers:
- name: busybox
image: docker.io/library/busybox:1.28
command:
- sleep
- "3600"
imagePullPolicy: IfNotPresent
restartPolicy: Always
EOFkubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 3h44m
kubectl exec busybox -n default -- nslookup kubernetes
Server: 10.96.0.10
Address 1: 10.96.0.10 kube-dns.kube-system.svc.cluster.local
Name: kubernetes
Address 1: 10.96.0.1 kubernetes.default.svc.cluster.localkubectl exec busybox -n default -- nslookup kube-dns.kube-system
Server: 10.96.0.10
Address 1: 10.96.0.10 kube-dns.kube-system.svc.cluster.local
Name: kube-dns.kube-system
Address 1: 10.96.0.10 kube-dns.kube-system.svc.cluster.localtelnet 10.96.0.1 443
Trying 10.96.0.1...
Connected to 10.96.0.1.
Escape character is '^]'.
telnet 10.96.0.10 53
Trying 10.96.0.10...
Connected to 10.96.0.10.
Escape character is '^]'.
curl 10.96.0.10:53
curl: (52) Empty reply from server# 进入busybox ping其他节点上的pod
kubectl exec -ti busybox -- sh
# ping node主机
/ # ping 192.168.80.45
PING 192.168.80.46 (192.168.80.46): 56 data bytes
64 bytes from 192.168.80.46: seq=0 ttl=63 time=3.778 ms
# ping coredns pod地址
/ # ping 172.16.85.196
PING 172.16.85.196 (172.16.85.196): 56 data bytes
64 bytes from 172.16.85.196: seq=0 ttl=62 time=1.648 ms
# ping baidu地址
/ # ping baidu.com
PING baidu.com (110.242.68.66): 56 data bytes
64 bytes from 110.242.68.66: seq=0 ttl=127 time=38.964 ms
64 bytes from 110.242.68.66: seq=1 ttl=127 time=40.936 mscat > deployments.yaml << EOF
apiVersion: apps/v1
kind: Deployment
metadata:
name: nginx-deployment
labels:
app: nginx
spec:
replicas: 3
selector:
matchLabels:
app: nginx
template:
metadata:
labels:
app: nginx
spec:
containers:
- name: nginx
image: docker.io/library/nginx:1.14.2
ports:
- containerPort: 80
EOF
kubectl apply -f deployments.yaml
deployment.apps/nginx-deployment created
kubectl get pod -owide -w
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
busybox 1/1 Running 0 99s 172.16.58.194 k8s-node02 <none> <none>
nginx-deployment-78c4d49446-8cz9r 1/1 Running 0 36s 172.16.85.195 k8s-node01 <none> <none>
nginx-deployment-78c4d49446-jzpd6 1/1 Running 0 36s 172.16.58.195 k8s-node02 <none> <none>
nginx-deployment-78c4d49446-lbmlb 1/1 Running 0 36s 172.16.85.194 k8s-node01 <none> <none># 标签
kubectl label node k8s-master01 k8s-master02 k8s-master03 node-role.kubernetes.io/master=
kubectl label node k8s-node01 k8s-node02 node-role.kubernetes.io/node=
# 污点
kubectl taint nodes k8s-master01 k8s-master02 k8s-master03 node-role.kubernetes.io/master=:NoSchedule# 1. k8s-master02 上，停止kubelet进程
systemctl stop kubelet
# 2. 检查 k8s-master02 是否已下线
kubectl get nodes
# 3. 删除节点
kubectl drain k8s-master02
# 4.强制下线
kubectl drain k8s-master02 --ignore-daemonsets
# 5. 下线状态
kubectl get nodes
# 6. 恢复操作 (如有必要)
kubectl uncordon k8s-master02
# 7. 彻底删除
kubectl delete node k8s-master02
# 8. 彻底删除加回来
kubectl get csr
kubectl certificate approve csr-pjsd8
# https://kubernetes.io/zh-cn/docs/tasks/tls/certificate-rotation
