[系统运维]kubernetes集群搭建（2）

安装docker

# 参考阿里云
# https://developer.aliyun.com/mirror/docker-ce?spm=a2c6h.13651102.0.0.3e221b11RIrnWN

# 编辑daemon
cat > /etc/docker/daemon.json <<EOF
{
"exec-opts": ["native.cgroupdriver=systemd"]
}
EOF

安装kubernetes组件

# kubernetes镜像
# https://developer.aliyun.com/mirror/kubernetes?spm=a2c6h.13651102.0.0.3e221b11RIrnWN

cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF


# 安装 kubelet kubeadm kubectl
yum install -y --nogpgcheck kubelet kubeadm kubectl


# 配置kubelet的cgroup
cat <<EOF >/etc/sysconfig/kubelet
KUBELET_CGROUP_ARGS="--cgroup-driver=systemd"
KUBE_PROXY_MODE="ipvs"
EOF


# 启动
systemctl enable kubelet && systemctl start kubelet

准备集群镜像

// 查看需要镜像

[root@vigour ~]# kubeadm config images list
k8s.gcr.io/kube-apiserver:v1.22.2
k8s.gcr.io/kube-controller-manager:v1.22.2
k8s.gcr.io/kube-scheduler:v1.22.2
k8s.gcr.io/kube-proxy:v1.22.2
k8s.gcr.io/pause:3.5
k8s.gcr.io/etcd:3.5.0-0
k8s.gcr.io/coredns/coredns:v1.8.4

// 拉取镜像
kubeadm init \
--apiserver-advertise-address=192.168.43.128 \
--image-repository registry.aliyuncs.com/google_containers \
--kubernetes-version=v1.22.2 \
--pod-network-cidr=10.244.0.0/16 \
--service-cidr=10.96.0.0/12 

// 创建目录保存配置信息
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config

// 加入集群

安装网络插件

wget https://github.com/caoran/kube-flannel.yml/blob/master/kube-flannel.yml

kubectl apply -f kube-flannel.yml

[root@master ~]# kubectl get nodes
NAME     STATUS   ROLES                  AGE     VERSION
master   Ready    control-plane,master   8m31s   v1.22.2
node1    Ready    <none>                 84s     v1.22.2
node2    Ready    <none>  

安装nginx

# 安装nginx
[root@master ~]# kubectl create deployment nginx --image=nginx:1.14-alpine
deployment.apps/nginx created

# 部署niginx
[root@master ~]# kubectl expose deployment nginx --port=80 --type=NodePort
service/nginx exposed

# 查看pod
[root@master ~]# kubectl get pod
NAME                     READY   STATUS    RESTARTS   AGE
nginx-65c4bffcb6-g4ths   1/1     Running   0          44s


# 查看service
[root@master ~]# kubectl get service
NAME         TYPE        CLUSTER-IP    EXTERNAL-IP   PORT(S)        AGE
kubernetes   ClusterIP   10.96.0.1     <none>        443/TCP        48m
nginx        NodePort    10.109.37.7   <none>        80:31182/TCP   20s