Kubernetes安装

节点：

• master
• node1
• node2

1、设置hostname

# 在master节点
# hostnamectl set-hostname master #设置master节点的hostname

# 在node1节点
# hostnamectl set-hostname node1 #设置node1节点的hostname

# 在node2节点
# hostnamectl set-hostname node2 #设置node2节点的hostname

2、/etc/hosts # 三节点一致

192.168.10.11 master
192.168.10.13 node1
192.168.10.15 node2

3、基本设置，三节点都设置

# 关防火墙、Selinux
systemctl stop firewalld
systemctl disable firewalld
setenforce 0
sed -i 's#(SELINUX=).*#\1disabled#' /etc/selinux/config
# 关swap
swapoff -a
sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab  #关闭开机自动挂载
# 参数相关，iptables过滤
cat <<EOF >  /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.ip_forward=1
vm.max_map_count=262144
EOF
modprobe br_netfilter
sysctl -p /etc/sysctl.d/k8s.conf
# yum

curl -o /etc/yum.repos.d/docker-ce.repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

cat <<EOF > /etc/yum.repos.d/kubernetes.repo

[kubernetes]
name=Kubernetes
baseurl=http://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=0
repo_gpgcheck=0
gpgkey=http://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg
        http://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF
yum clean all && yum makecache

安装docker

yum install docker-ce

安装 kubeadm, kubelet 和 kubectl

yum install kubeadm kubelet kubectl

systemctl enable kubelet #自动启动

 

初始化kubeadm

kubeadm config print init-defaults > kubeadm.yaml
cat kubeadm.yaml
###
apiVersion: kubeadm.k8s.io/v1beta2
bootstrapTokens:
- groups:
  - system:bootstrappers:kubeadm:default-node-token
  token: abcdef.0123456789abcdef
  ttl: 24h0m0s
  usages:
  - signing
  - authentication
kind: InitConfiguration
localAPIEndpoint:
  advertiseAddress: 1.2.3.4
  bindPort: 6443
nodeRegistration:
  criSocket: /var/run/dockershim.sock
  name: master
  taints:
  - effect: NoSchedule
    key: node-role.kubernetes.io/master
---
apiServer:
  timeoutForControlPlane: 4m0s
apiVersion: kubeadm.k8s.io/v1beta2
certificatesDir: /etc/kubernetes/pki
clusterName: kubernetes
controllerManager: {}
dns:
  type: CoreDNS
etcd:
  local:
    dataDir: /var/lib/etcd
imageRepository: k8s.gcr.io
kind: ClusterConfiguration
kubernetesVersion: v1.19.0
networking:
  dnsDomain: cluster.local
  serviceSubnet: 10.96.0.0/12
scheduler: {}

修改yaml中的配置：

#advertiseAddress: 1.2.3.4
advertiseAddress: 192.168.10.11 # master地址

# imageRepository: k8s.gcr.io
imageRepository: registry.aliyuncs.com/google_containers # 使用aliyuncs镜像

下载镜像

#查看
#kubeadm config images list --config kubeadm.yaml

registry.aliyuncs.com/google_containers/kube-apiserver:v1.19.0
registry.aliyuncs.com/google_containers/kube-controller-manager:v1.19.0
registry.aliyuncs.com/google_containers/kube-scheduler:v1.19.0
registry.aliyuncs.com/google_containers/kube-proxy:v1.19.0
registry.aliyuncs.com/google_containers/pause:3.2
registry.aliyuncs.com/google_containers/etcd:3.4.13-0
registry.aliyuncs.com/google_containers/coredns:1.7.0

kubeadm config images pull --config kubeadm.yaml # pull image

初始化

# 如果没有执行前面的pull，这里也会自动去pull
kubeadm init --config kubeadm.yaml

成功后出行提示

To start using your cluster, you need to run the following as a regular user:

  mkdir -p $HOME/.kube
  sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
  sudo chown $(id -u):$(id -g) $HOME/.kube/config

You should now deploy a pod network to the cluster.
Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at:
  https://kubernetes.io/docs/concepts/cluster-administration/addons/

Then you can join any number of worker nodes by running the following on each as root:

kubeadm join 192.168.10.11:6443 --token abcdef.0123456789abcdef \
    --discovery-token-ca-cert-hash sha256:1c4305f032f4bf534f628c32f5039084f4b103c922ff71b12a5f0f98d1ca9a4f

接下来按照上述提示信息操作，配置kubectl客户端的认证

  mkdir -p $HOME/.kube
  sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
  sudo chown $(id -u):$(id -g) $HOME/.kube/config

添加到集群中，到node1,node2上执行

kubeadm join 192.168.10.11:6443 --token abcdef.0123456789abcdef \
    --discovery-token-ca-cert-hash sha256:1c4305f032f4bf534f628c32f5039084f4b103c922ff71b12a5f0f98d1ca9a4f

 

查看状态

kubectl get nodes

kubectl get all


……

 

安装失败后，重新安装

kubeadm reset