K8s-二进制安装
K8S-二进制安装使用
1.IP总规划
服务类型 | ip地址 | 组件 |
---|---|---|
k8s-master01 etcd集群节点1 |
192.168.80.20 | kube-apiserver、kube-controller-manager、kube-scheduler etcd |
k8s-master02 | 192.168.80.25 | |
k8s-node01 etcd集群节点2 |
192.168.80.30 | kubelet、kube-proxy、docker、etcd |
k8s-node02 etcd集群节点3 |
192.168.80.35 | kubelet、kube-proxy、docker、etcd |
负载均衡nginx+keepalive01(master) | 192.168.80.40 vip:192.168.80.100 |
|
负载均衡nginx+keepalive02(backup) | 192.168.80.45 vip192.168.80.100 |
2.部署步骤
2.1 环境准备(master01、node01、node02)
#关闭防火墙
systemctl stop firewalld
systemctl disable firewalld
iptables -F && iptables -t nat -F && iptables -t mangle -F && iptables -X
#关闭selinux
setenforce 0
sed -i 's/enforcing/disabled/' /etc/selinux/config
#关闭swap
swapoff -a
sed -ri 's/.*swap.*/#&/' /etc/fstab
#根据规划设置主机名
hostnamectl set-hostname master01
hostnamectl set-hostname node01
hostnamectl set-hostname node02
#在master添加hosts
cat >> /etc/hosts << EOF
192.168.80.20 master01
192.168.80.25 master02
192.168.80.30 node01
192.168.80.35 node02
EOF
#调整内核参数
cat > /etc/sysctl.d/k8s.conf << EOF
#开启网桥模式,可将网桥的流量传递给iptables链
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
#关闭ipv6协议
net.ipv6.conf.all.disable_ipv6=1
net.ipv4.ip_forward=1
EOF
sysctl --system
#时间同步
yum install ntpdate -y
ntpdate time.windows.com
crontab -e
*/30 * * * * ntpdate time.windows.com
操作截图
2.2 部署 etcd 集群
//在 master01 节点上操作
#准备cfssl证书生成工具
wget https://pkg.cfssl.org/R1.2/cfssl_linux-amd64 -O /usr/local/bin/cfssl
wget https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64 -O /usr/local/bin/cfssljson
wget https://pkg.cfssl.org/R1.2/cfssl-certinfo_linux-amd64 -O /usr/local/bin/cfssl-certinfo
chmod +x /usr/local/bin/cfssl*
#生成Etcd证书
mkdir /opt/k8s
cd /opt/k8s/
#上传 etcd-cert.sh 和 etcd.sh 到 /opt/k8s/ 目录中
chmod +x etcd-cert.sh etcd.sh
#创建用于生成CA证书、etcd 服务器证书以及私钥的目录
mkdir /opt/k8s/etcd-cert
mv etcd-cert.sh etcd-cert/
cd /opt/k8s/etcd-cert/
./etcd-cert.sh
ls
ca-config.json ca-csr.json ca.pem server.csr server-key.pem
ca.csr ca-key.pem etcd-cert.sh server-csr.json server.pem
#上传 etcd-v3.4.9-linux-amd64.tar.gz 到 /opt/k8s 目录中,启动etcd服务
cd /opt/k8s/
tar zxvf etcd-v3.4.9-linux-amd64.tar.gz
mkdir -p /opt/etcd/{cfg,bin,ssl}
cd /opt/k8s/etcd-v3.4.9-linux-amd64/
mv etcd etcdctl /opt/etcd/bin/
cp /opt/k8s/etcd-cert/*.pem /opt/etcd/ssl/
cd /opt/k8s/
./etcd.sh etcd01 192.168.80.20 etcd02=https://192.168.80.30:2380,etcd03=https://192.168.80.35:2380
ps -ef | grep etcd
scp -r /opt/etcd/ root@192.168.80.30:/opt/
scp -r /opt/etcd/ root@192.168.80.35:/opt/
scp /usr/lib/systemd/system/etcd.service root@192.168.80.30:/usr/lib/systemd/system/
scp /usr/lib/systemd/system/etcd.service root@192.168.80.35:/usr/lib/systemd/system/
//在 node01 节点上操作
vim /opt/etcd/cfg/etcd
#[Member]
ETCD_NAME="etcd02" #修改
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://192.168.80.30:2380" #修改
ETCD_LISTEN_CLIENT_URLS="https://192.168.80.30:2379" #修改
#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.80.30:2380" #修改
ETCD_ADVERTISE_CLIENT_URLS="https://192.168.80.30:2379" #修改
ETCD_INITIAL_CLUSTER="etcd01=https://192.168.80.20:2380,etcd02=https://192.168.80.30:2380,etcd03=https://192.168.80.35:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"
systemctl start etcd
systemctl enable etcd
systemctl status etcd
//在 node02 节点上操作
vim /opt/etcd/cfg/etcd
#[Member]
ETCD_NAME="etcd03" #修改
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://192.168.80.35:2380" #修改
ETCD_LISTEN_CLIENT_URLS="https://192.168.80.35:2379" #修改
#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.80.35:2380" #修改
ETCD_ADVERTISE_CLIENT_URLS="https://192.168.80.35:2379" #修改
ETCD_INITIAL_CLUSTER="etcd01=https://192.168.80.20:2380,etcd02=https://192.168.80.30:2380,etcd03=https://192.168.80.35:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"
systemctl start etcd
systemctl enable etcd
systemctl status etcd
#检查etcd群集状态
ETCDCTL_API=3 /opt/etcd/bin/etcdctl --cacert=/opt/etcd/ssl/ca.pem --cert=/opt/etcd/ssl/server.pem --key=/opt/etcd/ssl/server-key.pem --endpoints="https://192.168.80.20:2379,https://192.168.80.30:2379,https://192.168.80.35:2379" endpoint health --write-out=table
ETCDCTL_API=3 /opt/etcd/bin/etcdctl --cacert=/opt/etcd/ssl/ca.pem --cert=/opt/etcd/ssl/server.pem --key=/opt/etcd/ssl/server-key.pem --endpoints="https://192.168.80.20:2379,https://192.168.80.30:2379,https://192.168.80.35:2379" --write-out=table member list
etcd.sh内容
#!/bin/bash
#example: ./etcd.sh etcd01 192.168.80.20 etcd02=https://192.168.80.30:2380,etcd03=https://192.168.80.35:2380
#创建etcd配置文件/opt/etcd/cfg/etcd
ETCD_NAME=$1
ETCD_IP=$2
ETCD_CLUSTER=$3
WORK_DIR=/opt/etcd
cat > $WORK_DIR/cfg/etcd <<EOF
#[Member]
ETCD_NAME="${ETCD_NAME}"
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://${ETCD_IP}:2380"
ETCD_LISTEN_CLIENT_URLS="https://${ETCD_IP}:2379"
#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://${ETCD_IP}:2380"
ETCD_ADVERTISE_CLIENT_URLS="https://${ETCD_IP}:2379"
ETCD_INITIAL_CLUSTER="etcd01=https://${ETCD_IP}:2380,${ETCD_CLUSTER}"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"
EOF
#Member:成员配置
#ETCD_NAME:节点名称,集群中唯一。成员名字,集群中必须具备唯一性,如etcd01
#ETCD_DATA_DIR:数据目录。指定节点的数据存储目录,这些数据包括节点ID,集群ID,集群初始化配置,Snapshot文件,若未指定-wal-dir,还会存储WAL文件;如果不指定会用缺省目录
#ETCD_LISTEN_PEER_URLS:集群通信监听地址。用于监听其他member发送信息的地址。ip为全0代表监听本机所有接口
#ETCD_LISTEN_CLIENT_URLS:客户端访问监听地址。用于监听etcd客户发送信息的地址。ip为全0代表监听本机所有接口
#Clustering:集群配置
#ETCD_INITIAL_ADVERTISE_PEER_URLS:集群通告地址。其他member使用,其他member通过该地址与本member交互信息。一定要保证从其他member能可访问该地址。静态配置方式下,该参数的value一定要同时在--initial-cluster参数中存在
#ETCD_ADVERTISE_CLIENT_URLS:客户端通告地址。etcd客户端使用,客户端通过该地址与本member交互信息。一定要保证从客户侧能可访问该地址
#ETCD_INITIAL_CLUSTER:集群节点地址。本member使用。描述集群中所有节点的信息,本member根据此信息去联系其他member
#ETCD_INITIAL_CLUSTER_TOKEN:集群Token。用于区分不同集群。本地如有多个集群要设为不同
#ETCD_INITIAL_CLUSTER_STATE:加入集群的当前状态,new是新集群,existing表示加入已有集群。
#创建etcd.service服务管理文件
cat > /usr/lib/systemd/system/etcd.service <<EOF
[Unit]
Description=Etcd Server
After=network.target
After=network-online.target
Wants=network-online.target
[Service]
Type=notify
EnvironmentFile=${WORK_DIR}/cfg/etcd
ExecStart=${WORK_DIR}/bin/etcd \
--cert-file=${WORK_DIR}/ssl/server.pem \
--key-file=${WORK_DIR}/ssl/server-key.pem \
--trusted-ca-file=${WORK_DIR}/ssl/ca.pem \
--peer-cert-file=${WORK_DIR}/ssl/server.pem \
--peer-key-file=${WORK_DIR}/ssl/server-key.pem \
--peer-trusted-ca-file=${WORK_DIR}/ssl/ca.pem \
--logger=zap \
--enable-v2
Restart=on-failure
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
EOF
#--enable-v2:开启 etcd v2 API 接口。当前 flannel 版本不支持 etcd v3 通信
#--logger=zap:使用 zap 日志框架。zap.Logger 是go语言中相对日志库中性能最高的
#--peer开头的配置项用于指定集群内部TLS相关证书(peer 证书),这里全部都使用同一套证书认证
#不带--peer开头的的参数是指定 etcd 服务器TLS相关证书(server 证书),这里全部都使用同一套证书认证
systemctl daemon-reload
systemctl enable etcd
systemctl restart etcd
etcd-cert.sh内容
#!/bin/bash
#配置证书生成策略,让 CA 软件知道颁发有什么功能的证书,生成用来签发其他组件证书的根证书
cat > ca-config.json <<EOF
{
"signing": {
"default": {
"expiry": "87600h"
},
"profiles": {
"www": {
"expiry": "87600h",
"usages": [
"signing",
"key encipherment",
"server auth",
"client auth"
]
}
}
}
}
EOF
#ca-config.json:可以定义多个 profiles,分别指定不同的过期时间、使用场景等参数;
#后续在签名证书时会使用某个 profile;此实例只有一个 www 模板。
#expiry:指定了证书的有效期,87600h 为10年,如果用默认值一年的话,证书到期后集群会立即宕掉
#signing:表示该证书可用于签名其它证书;生成的 ca.pem 证书中 CA=TRUE;
#key encipherment:表示使用非对称密钥加密,如 RSA 加密;
#server auth:表示client可以用该 CA 对 server 提供的证书进行验证;
#client auth:表示server可以用该 CA 对 client 提供的证书进行验证;
#注意标点符号,最后一个字段一般是没有逗号的。
#-----------------------
#生成CA证书和私钥(根证书和私钥)
#特别说明: cfssl和openssl有一些区别,openssl需要先生成私钥,然后用私钥生成请求文件,最后生成签名的证书和私钥等,但是cfssl可以直接得到请求文件。
cat > ca-csr.json <<EOF
{
"CN": "etcd",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"L": "Beijing",
"ST": "Beijing"
}
]
}
EOF
#CN:Common Name,浏览器使用该字段验证网站或机构是否合法,一般写的是域名
#key:指定了加密算法,一般使用rsa(size:2048)
#C:Country,国家
#ST:State,州,省
#L:Locality,地区,城市
#O: Organization Name,组织名称,公司名称
#OU: Organization Unit Name,组织单位名称,公司部门
cfssl gencert -initca ca-csr.json | cfssljson -bare ca
#生成的文件:
#ca-key.pem:根证书私钥
#ca.pem:根证书
#ca.csr:根证书签发请求文件
#cfssl gencert -initca <CSRJSON>:使用 CSRJSON 文件生成生成新的证书和私钥。如果不添加管道符号,会直接把所有证书内容输出到屏幕。
#注意:CSRJSON 文件用的是相对路径,所以 cfssl 的时候需要 csr 文件的路径下执行,也可以指定为绝对路径。
#cfssljson 将 cfssl 生成的证书(json格式)变为文件承载式证书,-bare 用于命名生成的证书文件。
#-----------------------
#生成 etcd 服务器证书和私钥
cat > server-csr.json <<EOF
{
"CN": "etcd",
"hosts": [
"192.168.80.20",
"192.168.80.30",
"192.168.80.35"
],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"L": "BeiJing",
"ST": "BeiJing"
}
]
}
EOF
#hosts:将所有 etcd 集群节点添加到 host 列表,需要指定所有 etcd 集群的节点 ip 或主机名不能使用网段,新增 etcd 服务器需要重新签发证书。
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=www server-csr.json | cfssljson -bare server
#生成的文件:
#server.csr:服务器的证书请求文件
#server-key.pem:服务器的私钥
#server.pem:服务器的数字签名证书
#-config:引用证书生成策略文件 ca-config.json
#-profile:指定证书生成策略文件中的的使用场景,比如 ca-config.json 中的 www
操作截图
master01操作
node1节点修改
node2节点修改
2.3 部署 docker引擎
//所有 node 节点部署docker引擎
yum install -y yum-utils device-mapper-persistent-data lvm2
yum-config-manager --add-repo https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
yum install -y docker-ce docker-ce-cli containerd.io
systemctl start docker.service
systemctl enable docker.service
操作截图(以node01为例)
2.4 部署master组件
//在 master01 节点上操作
#上传 master.zip 和 k8s-cert.sh 到 /opt/k8s 目录中,解压 master.zip 压缩包
#master.zip 中为apiserver.sh、schedule.sh、admin.sh、controller-manager.sh 4个脚本
cd /opt/k8s/
unzip master.zip
chmod +x *.sh
mkdir -p /opt/kubernetes/{bin,cfg,ssl,logs}
#创建用于生成CA证书、相关组件的证书和私钥的目录
mkdir /opt/k8s/k8s-cert
mv /opt/k8s/k8s-cert.sh /opt/k8s/k8s-cert
cd /opt/k8s/k8s-cert/
./k8s-cert.sh
ls *pem
admin-key.pem apiserver-key.pem ca-key.pem kube-proxy-key.pem
admin.pem apiserver.pem ca.pem kube-proxy.pem
cp ca*pem apiserver*pem /opt/kubernetes/ssl/
#上传 kubernetes-server-linux-amd64.tar.gz 到 /opt/k8s/ 目录中,解压 kubernetes 压缩包
cd /opt/k8s/
tar zxvf kubernetes-server-linux-amd64.tar.gz
cd /opt/k8s/kubernetes/server/bin
cp kube-apiserver kubectl kube-controller-manager kube-scheduler /opt/kubernetes/bin/
ln -s /opt/kubernetes/bin/* /usr/local/bin/
#创建 bootstrap token 认证文件,apiserver 启动时会调用,然后就相当于在集群内创建了一个这个用户,接下来就可以用 RBAC 给他授权
cd /opt/k8s/
vim token.sh
#!/bin/bash
#获取随机数前16个字节内容,以十六进制格式输出,并删除其中空格
BOOTSTRAP_TOKEN=$(head -c 16 /dev/urandom | od -An -t x | tr -d ' ')
#生成 token.csv 文件,按照 Token序列号,用户名,UID,用户组 的格式生成
cat > /opt/kubernetes/cfg/token.csv <<EOF
${BOOTSTRAP_TOKEN},kubelet-bootstrap,10001,"system:kubelet-bootstrap"
EOF
chmod +x token.sh
./token.sh
cat /opt/kubernetes/cfg/token.csv
cd /opt/k8s/
./apiserver.sh 192.168.80.20 https://192.168.80.20:2379,https://192.168.80.30:2379,https://192.168.80.35:2379
ps aux | grep kube-apiserver
netstat -natp | grep 6443 #安全端口6443用于接收HTTPS请求,用于基于Token文件或客户端证书等认证
cd /opt/k8s/
#启动 scheduler 服务
./scheduler.sh
ps aux | grep kube-scheduler
#启动 controller-manager 服务
./controller-manager.sh
ps aux | grep kube-controller-manager
#生成kubectl连接集群的证书
./admin.sh
kubectl create clusterrolebinding cluster-system-anonymous --clusterrole=cluster-admin --user=system:anonymous
#通过kubectl工具查看当前集群组件状态
kubectl get cs
NAME STATUS MESSAGE ERROR
controller-manager Healthy ok
scheduler Healthy ok
etcd-2 Healthy {"health":"true"}
etcd-1 Healthy {"health":"true"}
etcd-0 Healthy {"health":"true"}
#查看版本信息
kubectl version
k8s-cert.sh内容
#!/bin/bash
#配置证书生成策略,让 CA 软件知道颁发有什么功能的证书,生成用来签发其他组件证书的根证书
cat > ca-config.json <<EOF
{
"signing": {
"default": {
"expiry": "87600h"
},
"profiles": {
"kubernetes": {
"expiry": "87600h",
"usages": [
"signing",
"key encipherment",
"server auth",
"client auth"
]
}
}
}
}
EOF
#生成CA证书和私钥(根证书和私钥)
cat > ca-csr.json <<EOF
{
"CN": "kubernetes",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"L": "Beijing",
"ST": "Beijing",
"O": "k8s",
"OU": "System"
}
]
}
EOF
cfssl gencert -initca ca-csr.json | cfssljson -bare ca -
#-----------------------
#生成 apiserver 的证书和私钥(apiserver和其它k8s组件通信使用)
#hosts中将所有可能作为 apiserver 的 ip 添加进去,后面 keepalived 使用的 VIP 也要加入
cat > apiserver-csr.json <<EOF
{
"CN": "kubernetes",
"hosts": [
"10.0.0.1",
"127.0.0.1",
"192.168.80.20", #master01
"192.168.80.25", #master02
"192.168.80.100", #vip,后面 keepalived 使用
"192.168.80.40", #load balancer01(master)
"192.168.80.45", #load balancer02(backup)
"kubernetes",
"kubernetes.default",
"kubernetes.default.svc",
"kubernetes.default.svc.cluster",
"kubernetes.default.svc.cluster.local"
],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"L": "BeiJing",
"ST": "BeiJing",
"O": "k8s",
"OU": "System"
}
]
}
EOF
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes apiserver-csr.json | cfssljson -bare apiserver
#-----------------------
#生成 kubectl 连接集群的证书和私钥,具有admin权限
cat > admin-csr.json <<EOF
{
"CN": "admin",
"hosts": [],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"L": "BeiJing",
"ST": "BeiJing",
"O": "system:masters",
"OU": "System"
}
]
}
EOF
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes admin-csr.json | cfssljson -bare admin
#-----------------------
#生成 kube-proxy 的证书和私钥
cat > kube-proxy-csr.json <<EOF
{
"CN": "system:kube-proxy",
"hosts": [],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"L": "BeiJing",
"ST": "BeiJing",
"O": "k8s",
"OU": "System"
}
]
}
EOF
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes kube-proxy-csr.json | cfssljson -bare kube-proxy
apiserver.sh内容
#!/bin/bash
#example: apiserver.sh 192.168.80.10 https://192.168.80.20:2379,https://192.168.80.30:2379,https://192.168.80.35:2379
#创建 kube-apiserver 启动参数配置文件
MASTER_ADDRESS=$1
ETCD_SERVERS=$2
cat >/opt/kubernetes/cfg/kube-apiserver <<EOF
KUBE_APISERVER_OPTS="--logtostderr=false \\
--v=2 \\
--log-dir=/opt/kubernetes/logs \\
--etcd-servers=${ETCD_SERVERS} \\
--bind-address=${MASTER_ADDRESS} \\
--secure-port=6443 \\
--advertise-address=${MASTER_ADDRESS} \\
--allow-privileged=true \\
--service-cluster-ip-range=10.0.0.0/24 \\
--enable-admission-plugins=NamespaceLifecycle,LimitRanger,ServiceAccount,ResourceQuota,NodeRestriction \\
--authorization-mode=RBAC,Node \\
--enable-bootstrap-token-auth=true \\
--token-auth-file=/opt/kubernetes/cfg/token.csv \\
--service-node-port-range=30000-50000 \\
--kubelet-client-certificate=/opt/kubernetes/ssl/apiserver.pem \\
--kubelet-client-key=/opt/kubernetes/ssl/apiserver-key.pem \\
--tls-cert-file=/opt/kubernetes/ssl/apiserver.pem \\
--tls-private-key-file=/opt/kubernetes/ssl/apiserver-key.pem \\
--client-ca-file=/opt/kubernetes/ssl/ca.pem \\
--service-account-key-file=/opt/kubernetes/ssl/ca-key.pem \\
--service-account-issuer=api \\
--service-account-signing-key-file=/opt/kubernetes/ssl/apiserver-key.pem \\
--etcd-cafile=/opt/etcd/ssl/ca.pem \\
--etcd-certfile=/opt/etcd/ssl/server.pem \\
--etcd-keyfile=/opt/etcd/ssl/server-key.pem \\
--requestheader-client-ca-file=/opt/kubernetes/ssl/ca.pem \\
--proxy-client-cert-file=/opt/kubernetes/ssl/apiserver.pem \\
--proxy-client-key-file=/opt/kubernetes/ssl/apiserver-key.pem \\
--requestheader-allowed-names=kubernetes \\
--requestheader-extra-headers-prefix=X-Remote-Extra- \\
--requestheader-group-headers=X-Remote-Group \\
--requestheader-username-headers=X-Remote-User \\
--enable-aggregator-routing=true \\
--audit-log-maxage=30 \\
--audit-log-maxbackup=3 \\
--audit-log-maxsize=100 \\
--audit-log-path=/opt/kubernetes/logs/k8s-audit.log"
EOF
#--logtostderr=true:启用日志。输出日志到标准错误控制台,不输出到文件
#--v=4:日志等级。指定输出日志的级别,v=4为调试级别详细输出
#--etcd-servers:etcd集群地址。指定etcd服务器列表(格式://ip:port),逗号分隔
#--bind-address:监听地址。指定 HTTPS 安全接口的监听地址,默认值0.0.0.0
#--secure-port:https安全端口。指定 HTTPS 安全接口的监听端口,默认值6443
#--advertise-address:集群通告地址。通过该 ip 地址向集群其他节点公布 api server 的信息,必须能够被其他节点访问
#--allow-privileged=true:启用授权。允许拥有系统特权的容器运行,默认值false
#--service-cluster-ip-range:Service虚拟IP地址段。指定 Service Cluster IP 地址段
#--enable-admission-plugins:准入控制模块。kuberneres集群的准入控制机制,各控制模块以插件的形式依次生效,集群时必须包含ServiceAccount,运行在认证(Authentication)、授权(Authorization)之后,Admission Control是权限认证链上的最后一环, 对请求API资源对象进行修改和校验
#--authorization-mode:认证授权,启用RBAC授权和节点自管理。在安全端口使用RBAC,Node授权模式,未通过授权的请求拒绝,默认值AlwaysAllow。RBAC是用户通过角色与权限进行关联的模式;Node模式(节点授权)是一种特殊用途的授权模式,专门授权由kubelet发出的API请求,在进行认证时,先通过用户名、用户分组验证是否是集群中的Node节点,只有是Node节点的请求才能使用Node模式授权
#--enable-bootstrap-token-auth:启用TLS bootstrap机制。在apiserver上启用Bootstrap Token 认证
#--token-auth-file=/opt/kubernetes/cfg/token.csv:指定bootstrap token认证文件路径
#--service-node-port-range:指定 Service NodePort 的端口范围,默认值30000-32767
#–-kubelet-client-xxx:apiserver访问kubelet客户端证书
#--tls-xxx-file:apiserver https证书
#1.20版本必须加的参数:–-service-account-issuer,–-service-account-signing-key-file
#--etcd-xxxfile:连接Etcd集群证书
#–-audit-log-xxx:审计日志
#启动聚合层相关配置:–requestheader-client-ca-file,–proxy-client-cert-file,–proxy-client-key-file,–requestheader-allowed-names,–requestheader-extra-headers-prefix,–requestheader-group-headers,–requestheader-username-headers,–enable-aggregator-routing
#创建 kube-apiserver.service 服务管理文件
cat >/usr/lib/systemd/system/kube-apiserver.service <<EOF
[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/kubernetes/kubernetes
[Service]
EnvironmentFile=-/opt/kubernetes/cfg/kube-apiserver
ExecStart=/opt/kubernetes/bin/kube-apiserver \$KUBE_APISERVER_OPTS
Restart=on-failure
[Install]
WantedBy=multi-user.target
EOF
systemctl daemon-reload
systemctl enable kube-apiserver
systemctl restart kube-apiserver
schedule.sh内容
#!/bin/bash
##创建 kube-scheduler 启动参数配置文件
MASTER_ADDRESS=$1
cat >/opt/kubernetes/cfg/kube-scheduler <<EOF
KUBE_SCHEDULER_OPTS="--logtostderr=false \\
--v=2 \\
--log-dir=/opt/kubernetes/logs \\
--leader-elect=true \\
--kubeconfig=/opt/kubernetes/cfg/kube-scheduler.kubeconfig \\
--bind-address=127.0.0.1"
EOF
#-–kubeconfig:连接 apiserver 用的配置文件,用于识别 k8s 集群
#--leader-elect=true:当该组件启动多个时,自动启动 leader 选举
#k8s中Controller-Manager和Scheduler的选主逻辑:k8s中的etcd是整个集群所有状态信息的存储,涉及数据的读写和多个etcd之间数据的同步,对数据的一致性要求严格,所以使用较复杂的 raft 算法来选择用于提交数据的主节点。而 apiserver 作为集群入口,本身是无状态的web服务器,多个 apiserver 服务之间直接负载请求并不需要做选主。Controller-Manager 和 Scheduler 作为任务类型的组件,比如 controller-manager 内置的 k8s 各种资源对象的控制器实时的 watch apiserver 获取对象最新的变化事件做期望状态和实际状态调整,调度器watch未绑定节点的pod做节点选择,显然多个这些任务同时工作是完全没有必要的,所以 controller-manager 和 scheduler 也是需要选主的,但是选主逻辑和 etcd 不一样的,这里只需要保证从多个 controller-manager 和 scheduler 之间选出一个 leader 进入工作状态即可,而无需考虑它们之间的数据一致和同步。
##生成kube-scheduler证书
cd /opt/k8s/k8s-cert/
#创建证书请求文件
cat > kube-scheduler-csr.json << EOF
{
"CN": "system:kube-scheduler",
"hosts": [],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"L": "BeiJing",
"ST": "BeiJing",
"O": "system:masters",
"OU": "System"
}
]
}
EOF
#生成证书
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes kube-scheduler-csr.json | cfssljson -bare kube-scheduler
#生成kubeconfig文件
KUBE_CONFIG="/opt/kubernetes/cfg/kube-scheduler.kubeconfig"
KUBE_APISERVER="https://192.168.80.20:6443"
kubectl config set-cluster kubernetes \
--certificate-authority=/opt/kubernetes/ssl/ca.pem \
--embed-certs=true \
--server=${KUBE_APISERVER} \
--kubeconfig=${KUBE_CONFIG}
kubectl config set-credentials kube-scheduler \
--client-certificate=./kube-scheduler.pem \
--client-key=./kube-scheduler-key.pem \
--embed-certs=true \
--kubeconfig=${KUBE_CONFIG}
kubectl config set-context default \
--cluster=kubernetes \
--user=kube-scheduler \
--kubeconfig=${KUBE_CONFIG}
kubectl config use-context default --kubeconfig=${KUBE_CONFIG}
##创建 kube-scheduler.service 服务管理文件
cat >/usr/lib/systemd/system/kube-scheduler.service <<EOF
[Unit]
Description=Kubernetes Scheduler
Documentation=https://github.com/kubernetes/kubernetes
[Service]
EnvironmentFile=-/opt/kubernetes/cfg/kube-scheduler
ExecStart=/opt/kubernetes/bin/kube-scheduler \$KUBE_SCHEDULER_OPTS
Restart=on-failure
[Install]
WantedBy=multi-user.target
EOF
systemctl daemon-reload
systemctl enable kube-scheduler
systemctl restart kube-scheduler
controller-manager.sh
#!/bin/bash
##创建 kube-controller-manager 启动参数配置文件
MASTER_ADDRESS=$1
cat >/opt/kubernetes/cfg/kube-controller-manager <<EOF
KUBE_CONTROLLER_MANAGER_OPTS="--logtostderr=false \\
--v=2 \\
--log-dir=/opt/kubernetes/logs \\
--leader-elect=true \\
--kubeconfig=/opt/kubernetes/cfg/kube-controller-manager.kubeconfig \\
--bind-address=127.0.0.1 \\
--allocate-node-cidrs=true \\
--cluster-cidr=10.244.0.0/16 \\
--service-cluster-ip-range=10.0.0.0/24 \\
--cluster-signing-cert-file=/opt/kubernetes/ssl/ca.pem \\
--cluster-signing-key-file=/opt/kubernetes/ssl/ca-key.pem \\
--root-ca-file=/opt/kubernetes/ssl/ca.pem \\
--service-account-private-key-file=/opt/kubernetes/ssl/ca-key.pem \\
--cluster-signing-duration=87600h0m0s"
EOF
#––leader-elect:当该组件启动多个时,自动选举(HA)
#-–kubeconfig:连接 apiserver 用的配置文件,用于识别 k8s 集群
#--cluster-cidr=10.244.0.0/16:pod资源的网段,需与pod网络插件的值设置一致。通常,Flannel网络插件的默认为10.244.0.0/16,Calico插件的默认值为192.168.0.0/16
#--cluster-signing-cert-file/–-cluster-signing-key-file:自动为kubelet颁发证书的CA,与apiserver保持一致。指定签名的CA机构根证书,用来签名为 TLS BootStrapping 创建的证书和私钥
#--root-ca-file:指定根CA证书文件路径,用来对 kube-apiserver 证书进行校验,指定该参数后,才会在 Pod 容器的 ServiceAccount 中放置该 CA 证书文件
#--experimental-cluster-signing-duration:设置为 TLS BootStrapping 签署的证书有效时间为10年,默认为1年
##生成kube-controller-manager证书
cd /opt/k8s/k8s-cert/
#创建证书请求文件
cat > kube-controller-manager-csr.json << EOF
{
"CN": "system:kube-controller-manager",
"hosts": [],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"L": "BeiJing",
"ST": "BeiJing",
"O": "system:masters",
"OU": "System"
}
]
}
EOF
#生成证书
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes kube-controller-manager-csr.json | cfssljson -bare kube-controller-manager
#生成kubeconfig文件
KUBE_CONFIG="/opt/kubernetes/cfg/kube-controller-manager.kubeconfig"
KUBE_APISERVER="https://192.168.80.20:6443"
kubectl config set-cluster kubernetes \
--certificate-authority=/opt/kubernetes/ssl/ca.pem \
--embed-certs=true \
--server=${KUBE_APISERVER} \
--kubeconfig=${KUBE_CONFIG}
kubectl config set-credentials kube-controller-manager \
--client-certificate=./kube-controller-manager.pem \
--client-key=./kube-controller-manager-key.pem \
--embed-certs=true \
--kubeconfig=${KUBE_CONFIG}
kubectl config set-context default \
--cluster=kubernetes \
--user=kube-controller-manager \
--kubeconfig=${KUBE_CONFIG}
kubectl config use-context default --kubeconfig=${KUBE_CONFIG}
##创建 kube-controller-manager.service 服务管理文件
cat >/usr/lib/systemd/system/kube-controller-manager.service <<EOF
[Unit]
Description=Kubernetes Controller Manager
Documentation=https://github.com/kubernetes/kubernetes
[Service]
EnvironmentFile=-/opt/kubernetes/cfg/kube-controller-manager
ExecStart=/opt/kubernetes/bin/kube-controller-manager \$KUBE_CONTROLLER_MANAGER_OPTS
Restart=on-failure
[Install]
WantedBy=multi-user.target
EOF
systemctl daemon-reload
systemctl enable kube-controller-manager
systemctl restart kube-controller-manager
admin.sh内容
#!/bin/bash
mkdir /root/.kube
KUBE_CONFIG="/root/.kube/config"
KUBE_APISERVER="https://192.168.80.20:6443"
cd /opt/k8s/k8s-cert/
kubectl config set-cluster kubernetes \
--certificate-authority=/opt/kubernetes/ssl/ca.pem \
--embed-certs=true \
--server=${KUBE_APISERVER} \
--kubeconfig=${KUBE_CONFIG}
kubectl config set-credentials cluster-admin \
--client-certificate=./admin.pem \
--client-key=./admin-key.pem \
--embed-certs=true \
--kubeconfig=${KUBE_CONFIG}
kubectl config set-context default \
--cluster=kubernetes \
--user=cluster-admin \
--kubeconfig=${KUBE_CONFIG}
kubectl config use-context default --kubeconfig=${KUBE_CONFIG}
controller-manager.sh内容
#!/bin/bash
##创建 kube-controller-manager 启动参数配置文件
MASTER_ADDRESS=$1
cat >/opt/kubernetes/cfg/kube-controller-manager <<EOF
KUBE_CONTROLLER_MANAGER_OPTS="--logtostderr=false \\
--v=2 \\
--log-dir=/opt/kubernetes/logs \\
--leader-elect=true \\
--kubeconfig=/opt/kubernetes/cfg/kube-controller-manager.kubeconfig \\
--bind-address=127.0.0.1 \\
--allocate-node-cidrs=true \\
--cluster-cidr=10.244.0.0/16 \\
--service-cluster-ip-range=10.0.0.0/24 \\
--cluster-signing-cert-file=/opt/kubernetes/ssl/ca.pem \\
--cluster-signing-key-file=/opt/kubernetes/ssl/ca-key.pem \\
--root-ca-file=/opt/kubernetes/ssl/ca.pem \\
--service-account-private-key-file=/opt/kubernetes/ssl/ca-key.pem \\
--cluster-signing-duration=87600h0m0s"
EOF
#––leader-elect:当该组件启动多个时,自动选举(HA)
#-–kubeconfig:连接 apiserver 用的配置文件,用于识别 k8s 集群
#--cluster-cidr=10.244.0.0/16:pod资源的网段,需与pod网络插件的值设置一致。通常,Flannel网络插件的默认为10.244.0.0/16,Calico插件的默认值为192.168.0.0/16
#--cluster-signing-cert-file/–-cluster-signing-key-file:自动为kubelet颁发证书的CA,与apiserver保持一致。指定签名的CA机构根证书,用来签名为 TLS BootStrapping 创建的证书和私钥
#--root-ca-file:指定根CA证书文件路径,用来对 kube-apiserver 证书进行校验,指定该参数后,才会在 Pod 容器的 ServiceAccount 中放置该 CA 证书文件
#--experimental-cluster-signing-duration:设置为 TLS BootStrapping 签署的证书有效时间为10年,默认为1年
##生成kube-controller-manager证书
cd /opt/k8s/k8s-cert/
#创建证书请求文件
cat > kube-controller-manager-csr.json << EOF
{
"CN": "system:kube-controller-manager",
"hosts": [],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"L": "BeiJing",
"ST": "BeiJing",
"O": "system:masters",
"OU": "System"
}
]
}
EOF
#生成证书
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes kube-controller-manager-csr.json | cfssljson -bare kube-controller-manager
#生成kubeconfig文件
KUBE_CONFIG="/opt/kubernetes/cfg/kube-controller-manager.kubeconfig"
KUBE_APISERVER="https://192.168.80.20:6443"
kubectl config set-cluster kubernetes \
--certificate-authority=/opt/kubernetes/ssl/ca.pem \
--embed-certs=true \
--server=${KUBE_APISERVER} \
--kubeconfig=${KUBE_CONFIG}
kubectl config set-credentials kube-controller-manager \
--client-certificate=./kube-controller-manager.pem \
--client-key=./kube-controller-manager-key.pem \
--embed-certs=true \
--kubeconfig=${KUBE_CONFIG}
kubectl config set-context default \
--cluster=kubernetes \
--user=kube-controller-manager \
--kubeconfig=${KUBE_CONFIG}
kubectl config use-context default --kubeconfig=${KUBE_CONFIG}
##创建 kube-controller-manager.service 服务管理文件
cat >/usr/lib/systemd/system/kube-controller-manager.service <<EOF
[Unit]
Description=Kubernetes Controller Manager
Documentation=https://github.com/kubernetes/kubernetes
[Service]
EnvironmentFile=-/opt/kubernetes/cfg/kube-controller-manager
ExecStart=/opt/kubernetes/bin/kube-controller-manager \$KUBE_CONTROLLER_MANAGER_OPTS
Restart=on-failure
[Install]
WantedBy=multi-user.target
EOF
systemctl daemon-reload
systemctl enable kube-controller-manager
systemctl restart kube-controller-manager
操作截图
2.5 部署 Worker Node 组件
MASTER02环境准备
先将2.1所有步骤执行一下
//在所有 node 节点上操作
#创建kubernetes工作目录
mkdir -p /opt/kubernetes/{bin,cfg,ssl,logs}
#上传 node.zip 到 /opt 目录中,解压 node.zip 压缩包,获得kubelet.sh、proxy.sh
cd /opt/
unzip node.zip
chmod +x kubelet.sh proxy.sh
//在 master01 节点上操作
#把 kubelet、kube-proxy 拷贝到 node 节点
cd /opt/k8s/kubernetes/server/bin
scp kubelet kube-proxy root@192.168.80.30:/opt/kubernetes/bin/
scp kubelet kube-proxy root@192.168.80.35:/opt/kubernetes/bin/
#上传 kubeconfig.sh 文件到 /opt/k8s/kubeconfig 目录中,生成 kubeconfig 的配置文件
mkdir /opt/k8s/kubeconfig
cd /opt/k8s/kubeconfig
chmod +x kubeconfig.sh
./kubeconfig.sh 192.168.80.20 /opt/k8s/k8s-cert/
scp bootstrap.kubeconfig kube-proxy.kubeconfig root@192.168.80.30:/opt/kubernetes/cfg/
scp bootstrap.kubeconfig kube-proxy.kubeconfig root@192.168.80.35:/opt/kubernetes/cfg/
#RBAC授权,使用户 kubelet-bootstrap 能够有权限发起 CSR 请求
kubectl create clusterrolebinding kubelet-bootstrap --clusterrole=system:node-bootstrapper --user=kubelet-bootstrap
//在 node01/02 节点上操作
#启动 kubelet 服务
cd /opt/
./kubelet.sh 192.168.80.30/35
ps aux | grep kubelet
//在 master01 节点上操作,通过 CSR 请求
#检查到 node01 节点的 kubelet 发起的 CSR 请求,Pending 表示等待集群给该节点签发证书
kubectl get csr
NAME AGE SIGNERNAME REQUESTOR CONDITION
node-csr-od7WoiYNololFAtl9xbhzB2aE3HWFi2uPWQzwygbmBU 69s kubernetes.io/kube-apiserver-client-kubelet kubelet-bootstrap Pending
node-csr-qq9aKXpHuxbDnG_KTpfbxbAWbuY5Na9813tq_n94_6Y 2m6s kubernetes.io/kube-apiserver-client-kubelet kubelet-bootstrap Pending
#通过 CSR 请求
kubectl certificate approve node-csr-od7WoiYNololFAtl9xbhzB2aE3HWFi2uPWQzwygbmBU
kubectl certificate approve node-csr-qq9aKXpHuxbDnG_KTpfbxbAWbuY5Na9813tq_n94_6Y
#Approved,Issued 表示已授权 CSR 请求并签发证书
kubectl get csr
NAME AGE SIGNERNAME REQUESTOR CONDITION
node-csr-od7WoiYNololFAtl9xbhzB2aE3HWFi2uPWQzwygbmBU 3m49s kubernetes.io/kube-apiserver-client-kubelet kubelet-bootstrap Approved,Issued
node-csr-qq9aKXpHuxbDnG_KTpfbxbAWbuY5Na9813tq_n94_6Y 4m46s kubernetes.io/kube-apiserver-client-kubelet kubelet-bootstrap Approved,Issued
#查看节点,由于网络插件还没有部署,节点会没有准备就绪 NotReady
kubectl get node
NAME STATUS ROLES AGE VERSION
192.168.80.30 NotReady <none> 69s v1.20.11
192.168.80.35 NotReady <none> 77s v1.20.11
//在 node01/02 节点上操作
#加载 ip_vs 模块
for i in $(ls /usr/lib/modules/$(uname -r)/kernel/net/netfilter/ipvs|grep -o "^[^.]*");do echo $i; /sbin/modinfo -F filename $i >/dev/null 2>&1 && /sbin/modprobe $i;done
#启动proxy服务
cd /opt/
./proxy.sh 192.168.80.30/35
ps aux | grep kube-proxy
kubeconfig.sh内容
#!/bin/bash
#example: kubeconfig 192.168.80.20 /opt/k8s/k8s-cert/
#创建bootstrap.kubeconfig文件
#该文件中内置了 token.csv 中用户的 Token,以及 apiserver CA 证书;kubelet 首次启动会加载此文件,使用 apiserver CA 证书建立与 apiserver 的 TLS 通讯,使用其中的用户 Token 作为身份标识向 apiserver 发起 CSR 请求
BOOTSTRAP_TOKEN=$(awk -F ',' '{print $1}' /opt/kubernetes/cfg/token.csv)
APISERVER=$1
SSL_DIR=$2
export KUBE_APISERVER="https://$APISERVER:6443"
# 设置集群参数
kubectl config set-cluster kubernetes \
--certificate-authority=$SSL_DIR/ca.pem \
--embed-certs=true \
--server=${KUBE_APISERVER} \
--kubeconfig=bootstrap.kubeconfig
#--embed-certs=true:表示将ca.pem证书写入到生成的bootstrap.kubeconfig文件中
# 设置客户端认证参数,kubelet 使用 bootstrap token 认证
kubectl config set-credentials kubelet-bootstrap \
--token=${BOOTSTRAP_TOKEN} \
--kubeconfig=bootstrap.kubeconfig
# 设置上下文参数
kubectl config set-context default \
--cluster=kubernetes \
--user=kubelet-bootstrap \
--kubeconfig=bootstrap.kubeconfig
# 使用上下文参数生成 bootstrap.kubeconfig 文件
kubectl config use-context default --kubeconfig=bootstrap.kubeconfig
#----------------------
#创建kube-proxy.kubeconfig文件
# 设置集群参数
kubectl config set-cluster kubernetes \
--certificate-authority=$SSL_DIR/ca.pem \
--embed-certs=true \
--server=${KUBE_APISERVER} \
--kubeconfig=kube-proxy.kubeconfig
# 设置客户端认证参数,kube-proxy 使用 TLS 证书认证
kubectl config set-credentials kube-proxy \
--client-certificate=$SSL_DIR/kube-proxy.pem \
--client-key=$SSL_DIR/kube-proxy-key.pem \
--embed-certs=true \
--kubeconfig=kube-proxy.kubeconfig
# 设置上下文参数
kubectl config set-context default \
--cluster=kubernetes \
--user=kube-proxy \
--kubeconfig=kube-proxy.kubeconfig
# 使用上下文参数生成 kube-proxy.kubeconfig 文件
kubectl config use-context default --kubeconfig=kube-proxy.kubeconfig
kubelet.sh内容
#!/bin/bash
NODE_ADDRESS=$1
DNS_SERVER_IP=${2:-"10.0.0.2"}
#创建 kubelet 启动参数配置文件
cat >/opt/kubernetes/cfg/kubelet <<EOF
KUBELET_OPTS="--logtostderr=false \\
--v=2 \\
--log-dir=/opt/kubernetes/logs \\
--hostname-override=${NODE_ADDRESS} \\
--network-plugin=cni \\
--kubeconfig=/opt/kubernetes/cfg/kubelet.kubeconfig \\
--bootstrap-kubeconfig=/opt/kubernetes/cfg/bootstrap.kubeconfig \\
--config=/opt/kubernetes/cfg/kubelet.config \\
--cert-dir=/opt/kubernetes/ssl \\
--pod-infra-container-image=registry.cn-hangzhou.aliyuncs.com/google-containers/pause-amd64:3.0"
EOF
#--hostname-override:指定kubelet节点在集群中显示的主机名或IP地址,默认使用主机hostname;kube-proxy和kubelet的此项参数设置必须完全一致
#--network-plugin:启用CNI
#--kubeconfig:指定kubelet.kubeconfig文件位置,当前为空路径,会自动生成,用于如何连接到apiserver,里面含有kubelet证书,master授权完成后会在node节点上生成 kubelet.kubeconfig 文件
#--bootstrap-kubeconfig:指定连接 apiserver 的 bootstrap.kubeconfig 文件
#--config:指定kubelet配置文件的路径,启动kubelet时将从此文件加载其配置
#--cert-dir:指定master颁发的kubelet证书生成目录
#--pod-infra-container-image:指定Pod基础容器(Pause容器)的镜像。Pod启动的时候都会启动一个这样的容器,每个pod之间相互通信需要Pause的支持,启动Pause需要Pause基础镜像
#----------------------
#创建kubelet配置文件(该文件实际上就是一个yml文件,语法非常严格,不能出现tab键,冒号后面必须要有空格,每行结尾也不能有空格)
cat >/opt/kubernetes/cfg/kubelet.config <<EOF
kind: KubeletConfiguration
apiVersion: kubelet.config.k8s.io/v1beta1
address: ${NODE_ADDRESS}
port: 10250
readOnlyPort: 10255
cgroupDriver: cgroupfs
clusterDNS:
- ${DNS_SERVER_IP}
clusterDomain: cluster.local
failSwapOn: false
authentication:
anonymous:
enabled: true
EOF
#PS:当命令行参数与此配置文件(kubelet.config)有相同的值时,就会覆盖配置文件中的该值。
#----------------------
#创建 kubelet.service 服务管理文件
cat >/usr/lib/systemd/system/kubelet.service <<EOF
[Unit]
Description=Kubernetes Kubelet
After=docker.service
Requires=docker.service
[Service]
EnvironmentFile=/opt/kubernetes/cfg/kubelet
ExecStart=/opt/kubernetes/bin/kubelet \$KUBELET_OPTS
Restart=on-failure
KillMode=process
[Install]
WantedBy=multi-user.target
EOF
systemctl daemon-reload
systemctl enable kubelet
systemctl restart kubelet
proxy.sh内容
#!/bin/bash
NODE_ADDRESS=$1
#创建 kube-proxy 启动参数配置文件
cat >/opt/kubernetes/cfg/kube-proxy <<EOF
KUBE_PROXY_OPTS="--logtostderr=true \\
--v=4 \\
--hostname-override=${NODE_ADDRESS} \\
--cluster-cidr=172.17.0.0/16 \\
--proxy-mode=ipvs \\
--kubeconfig=/opt/kubernetes/cfg/kube-proxy.kubeconfig"
EOF
#--hostnameOverride: 参数值必须与 kubelet 的值一致,否则 kube-proxy 启动后会找不到该 Node,从而不会创建任何 ipvs 规则
#--cluster-cidr:指定 Pod 网络使用的聚合网段,Pod 使用的网段和 apiserver 中指定的 service 的 cluster ip 网段不是同一个网段。 kube-proxy 根据 --cluster-cidr 判断集群内部和外部流量,指定 --cluster-cidr 选项后 kube-proxy 才会对访问 Service IP 的请求做 SNAT,即来自非 Pod 网络的流量被当成外部流量,访问 Service 时需要做 SNAT。
#--proxy-mode:指定流量调度模式为ipvs模式,可添加--ipvs-scheduler选项指定ipvs调度算法(rr|wrr|lc|wlc|lblc|lblcr|dh|sh|sed|nq)
#--kubeconfig: 指定连接 apiserver 的 kubeconfig 文件
#----------------------
#创建 kube-proxy.service 服务管理文件
cat >/usr/lib/systemd/system/kube-proxy.service <<EOF
[Unit]
Description=Kubernetes Proxy
After=network.target
[Service]
EnvironmentFile=-/opt/kubernetes/cfg/kube-proxy
ExecStart=/opt/kubernetes/bin/kube-proxy \$KUBE_PROXY_OPTS
Restart=on-failure
[Install]
WantedBy=multi-user.target
EOF
systemctl daemon-reload
systemctl enable kube-proxy
systemctl restart kube-proxy
操作截图
node01/02操作
master节点操作
node01/02操作
master操作
node1/2操作
2.6 部署网络组件(flannel)
//在 node01/02 节点上操作
#上传 cni-plugins-linux-amd64-v0.8.6.tgz 和 flannel.tar 到 /opt 目录中
cd /opt/
docker load -i flannel.tar
mkdir -p /opt/cni/bin
tar zxvf cni-plugins-linux-amd64-v0.8.6.tgz -C /opt/cni/bin
//在 master01 节点上操作
#上传 kube-flannel.yml 文件到 /opt/k8s 目录中,部署 CNI 网络
cd /opt/k8s
kubectl apply -f kube-flannel.yml
kubectl get pods -n kube-system
NAME READY STATUS RESTARTS AGE
kube-flannel-ds-4t9r8 1/1 Running 0 15s
kube-flannel-ds-ddpn4 1/1 Running 0 15s
kubectl get nodes
NAME STATUS ROLES AGE VERSION
192.168.80.30 Ready <none> 79m v1.20.11
192.168.80.35 Ready <none> 79m v1.20.11
kube-flannel.yml文件内容
---
apiVersion: policy/v1beta1
kind: PodSecurityPolicy
metadata:
name: psp.flannel.unprivileged
annotations:
seccomp.security.alpha.kubernetes.io/allowedProfileNames: docker/default
seccomp.security.alpha.kubernetes.io/defaultProfileName: docker/default
apparmor.security.beta.kubernetes.io/allowedProfileNames: runtime/default
apparmor.security.beta.kubernetes.io/defaultProfileName: runtime/default
spec:
privileged: false
volumes:
- configMap
- secret
- emptyDir
- hostPath
allowedHostPaths:
- pathPrefix: "/etc/cni/net.d"
- pathPrefix: "/etc/kube-flannel"
- pathPrefix: "/run/flannel"
readOnlyRootFilesystem: false
# Users and groups
runAsUser:
rule: RunAsAny
supplementalGroups:
rule: RunAsAny
fsGroup:
rule: RunAsAny
# Privilege Escalation
allowPrivilegeEscalation: false
defaultAllowPrivilegeEscalation: false
# Capabilities
allowedCapabilities: ['NET_ADMIN', 'NET_RAW']
defaultAddCapabilities: []
requiredDropCapabilities: []
# Host namespaces
hostPID: false
hostIPC: false
hostNetwork: true
hostPorts:
- min: 0
max: 65535
# SELinux
seLinux:
# SELinux is unused in CaaSP
rule: 'RunAsAny'
---
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
name: flannel
rules:
- apiGroups: ['extensions']
resources: ['podsecuritypolicies']
verbs: ['use']
resourceNames: ['psp.flannel.unprivileged']
- apiGroups:
- ""
resources:
- pods
verbs:
- get
- apiGroups:
- ""
resources:
- nodes
verbs:
- list
- watch
- apiGroups:
- ""
resources:
- nodes/status
verbs:
- patch
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
name: flannel
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: flannel
subjects:
- kind: ServiceAccount
name: flannel
namespace: kube-system
---
apiVersion: v1
kind: ServiceAccount
metadata:
name: flannel
namespace: kube-system
---
kind: ConfigMap
apiVersion: v1
metadata:
name: kube-flannel-cfg
namespace: kube-system
labels:
tier: node
app: flannel
data:
cni-conf.json: |
{
"name": "cbr0",
"cniVersion": "0.3.1",
"plugins": [
{
"type": "flannel",
"delegate": {
"hairpinMode": true,
"isDefaultGateway": true
}
},
{
"type": "portmap",
"capabilities": {
"portMappings": true
}
}
]
}
net-conf.json: |
{
"Network": "10.244.0.0/16",
"Backend": {
"Type": "vxlan"
}
}
---
apiVersion: apps/v1
kind: DaemonSet
metadata:
name: kube-flannel-ds
namespace: kube-system
labels:
tier: node
app: flannel
spec:
selector:
matchLabels:
app: flannel
template:
metadata:
labels:
tier: node
app: flannel
spec:
affinity:
nodeAffinity:
requiredDuringSchedulingIgnoredDuringExecution:
nodeSelectorTerms:
- matchExpressions:
- key: kubernetes.io/os
operator: In
values:
- linux
hostNetwork: true
priorityClassName: system-node-critical
tolerations:
- operator: Exists
effect: NoSchedule
serviceAccountName: flannel
initContainers:
- name: install-cni
image: quay.io/coreos/flannel:v0.14.0
command:
- cp
args:
- -f
- /etc/kube-flannel/cni-conf.json
- /etc/cni/net.d/10-flannel.conflist
volumeMounts:
- name: cni
mountPath: /etc/cni/net.d
- name: flannel-cfg
mountPath: /etc/kube-flannel/
containers:
- name: kube-flannel
image: quay.io/coreos/flannel:v0.14.0
command:
- /opt/bin/flanneld
args:
- --ip-masq
- --kube-subnet-mgr
resources:
requests:
cpu: "100m"
memory: "50Mi"
limits:
cpu: "100m"
memory: "50Mi"
securityContext:
privileged: false
capabilities:
add: ["NET_ADMIN", "NET_RAW"]
env:
- name: POD_NAME
valueFrom:
fieldRef:
fieldPath: metadata.name
- name: POD_NAMESPACE
valueFrom:
fieldRef:
fieldPath: metadata.namespace
volumeMounts:
- name: run
mountPath: /run/flannel
- name: flannel-cfg
mountPath: /etc/kube-flannel/
volumes:
- name: run
hostPath:
path: /run/flannel
- name: cni
hostPath:
path: /etc/cni/net.d
- name: flannel-cfg
configMap:
name: kube-flannel-cfg
操作截图
node01/02节点操作(以node01为例)
master01操作
2.7 多master节点部署
新主机准备,先将步骤2.1全部在master02中执行一遍
#从 master01 节点上拷贝证书文件、各master组件的配置文件和服务管理文件到 master02 节点
scp -r /opt/etcd/ root@192.168.80.25:/opt/
scp -r /opt/kubernetes/ root@192.168.80.25:/opt
scp /usr/lib/systemd/system/{kube-apiserver,kube-controller-manager,kube-scheduler}.service root@192.168.80.25:/usr/lib/systemd/system/
cd ~
scp -r .kube/ master02:/root
#修改配置文件kube-apiserver中的IP master02上操作
vim /opt/kubernetes/cfg/kube-apiserver
KUBE_APISERVER_OPTS="--logtostderr=true \
--v=4 \
--etcd-servers=https://192.168.80.20:2379,https://192.168.80.30:2379,https://192.168.80.35:2379 \
--bind-address=192.168.80.25 \ #修改
--secure-port=6443 \
--advertise-address=192.168.80.25 \ #修改
......
#创建命令链接
ln -s /opt/kubernetes/bin/* /usr/local/bin
#启动各服务,并设置开机自启
systemctl enable --now kube-apiserver.service
systemctl enable --now kube-controller-manager.service
systemctl enable --now kube-scheduler.service
操作截图
配置master02主机
2.8 lb01和lb02搭建nginx和Keepalived
配置load balancer集群双机热备负载均衡(nginx实现负载均衡,keepalived实现双机热备)
###lb01/lb02步骤一致,除个别ip和配置需修改
###机器初始化
systemctl disable --now firewalld.service
Removed symlink /etc/systemd/system/multi-user.target.wants/firewalld.service.
Removed symlink /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service.
setenforce 0
hostnamectl set-hostname lb01/02
su
###nginx yum源配置
cat > /etc/yum.repos.d/nginx.repo << 'EOF'
[nginx]
name=nginx repo
baseurl=http://nginx.org/packages/centos/7/$basearch/
gpgcheck=0
EOF
yum install nginx -y
###nginx配置文件修改,配置负载均衡
vim /etc/nginx/nginx.conf
events {
worker_connections 1024;
}
#添加
stream {
log_format main '$remote_addr $upstream_addr - [$time_local] $status $upstream_bytes_sent';
access_log /var/log/nginx/k8s-access.log main;
upstream k8s-apiserver {
server 192.168.80.20:6443;
server 192.168.80.25:6443;
}
server {
listen 6443;
proxy_pass k8s-apiserver;
}
}
http {
......
###启动nginx服务,监听6443端口
nginx -t
systemctl start nginx
systemctl enable nginx
netstat -natp | grep nginx
###安装并配置keeplived
yum install keepalived -y
vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
# 接收邮件地址(不变)
notification_email {
acassen@firewall.loc
failover@firewall.loc
sysadmin@firewall.loc
}
# 邮件发送地址
notification_email_from Alexandre.Cassen@firewall.loc
smtp_server 127.0.0.1 ##修改为127.0.0.1
smtp_connect_timeout 30
router_id LB01 #lb01节点的为 LB01,lb02节点的为 LB02
}
#添加一个周期性执行的脚本
vrrp_script check_nginx {
script "/etc/nginx/check_nginx.sh" #指定检查nginx存活的脚本路径
}
vrrp_instance VI_1 {
state MASTER #lb01节点的为 MASTER,lb02节点的为 BACKUP
interface ens33 #指定网卡名称 ens33
virtual_router_id 51 #指定vrid,两个节点要一致
priority 100 #lb01节点的为 100,lb02节点的为 90
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.80.100/24 #指定 VIP
}
track_script {
check_nginx #指定vrrp_script配置的脚本
}
}
其余配置删除
### 配置nginx检查脚本
vim /etc/nginx/check_nginx.sh
#!/bin/bash
#egrep -cv "grep|$$" #用于过滤掉包含grep 或者 $$ 表示的当前Shell进程ID
count=$(ps -ef | grep nginx | egrep -cv "grep|$$")
if [ "$count" -eq 0 ];then
systemctl stop keepalived
fi
chmod +x /etc/nginx/check_nginx.sh
###启动keeplived(nginx服务必须先启动)
systemctl start keepalived
systemctl enable keepalived
ip a #查看VIP是否生成
操作截图
keepalived测试
2.lb01恢复
2.9 修改node节点配置
###修改所有node节点上的bootstrap.kubeconfig,kubelet.kubeconfig配置文件为VIP
cd /opt/kubernetes/cfg/
vim bootstrap.kubeconfig
server: https://192.168.80.100:6443
vim kubelet.kubeconfig
server: https://192.168.80.100:6443
vim kube-proxy.kubeconfig
server: https://192.168.80.100:6443
###重启kubelet和kube-proxy服务
systemctl restart kubelet.service
systemctl restart kube-proxy.service
###LB01查看日志
tail /var/log/nginx/k8s-access.log
操作截图(以node01为例)
2.10 操作测试
###创建pod测试
[root@master02 ~]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
192.168.80.30 Ready <none> 2d2h v1.20.11
192.168.80.35 Ready <none> 2d2h v1.20.11
[root@master02 ~]# kubectl run nginx --image=nginx
pod/nginx created
[root@master02 ~]# kubectl get pods
NAME READY STATUS RESTARTS AGE
nginx 0/1 ContainerCreating 0 23s
[root@master02 ~]# kubectl get pods
NAME READY STATUS RESTARTS AGE
nginx 1/1 Running 0 40s
[root@master02 ~]# kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
nginx 1/1 Running 0 50s 10.244.1.2 192.168.80.30 <none> <none>
[root@master02 ~]# kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
nginx 1/1 Running 0 62s 10.244.1.2 192.168.80.30 <none> <none>
### 对应节点访问服务
curl 172.17.38.2
### master01查看日志
kubectl logs nginx
2.11 Dashboard UI部署
Dashboard UI是k8s的管理UI界面,可以通过图形化界面管理k8s的节点。
###创建命名空间
kubectl create ns kubernetes-dashboard
###创建Dashboard rbac文件
kubectl apply -f http://down.i4t.com/rbac-dashboard.yaml
创建dashboard
kubectl apply -f http://down.i4t.com/dashboard-k8s.yaml
###查看pod和svc
kubectl get pod,svc -n kubernetes-dashboard
###查看secret
kubectl -n kube-system get secret|grep admin-token
###获取token
kubectl get secret -n kube-system
操作截图
访问测试
查看节点状态,可以看到之前创建的nginx