Centos 快速安装配置K3S

尘缘k8s

免费视频教程

https://study.163.com/course/courseLearn.htm?courseId=1209568805#/learn/video?lessonId=1279885390&courseId=1209568805

官方文档(中文)

https://rancher2.docs.rancher.cn/docs/k3s/installation/_index

docker 安装

因为我对 Docker 比较熟悉，所以采用 docker 做为容器，默认为 containerd 

curl -fsSL https://get.docker.com -o get-docker.sh && sh get-docker.sh

Server 安装

curl -sfL https://get.k3s.io | sh -
curl -sfL https://get.k3s.io | sh -s - --docker

# 读出装好以后的  token 备用，其它 Agent 机器才能加入集群
cat /var/lib/rancher/k3s/server/node-token

--docker 表示 用 docker 代替 containerd

添加 Node

获取上一步的 Token 以后替换以直命令，并在 Node 机器上执行

curl -sfL https://get.k3s.io | K3S_URL=https://myserver:6443 K3S_TOKEN=${token} sh -
curl -sfL https://get.k3s.io | K3S_URL=https://myserver:6443 K3S_TOKEN=${token} sh -s - --docker

组建 Server 集群

如果有多台 Server ，可以通过以下命令组建集群

K3S_TOKEN=mynodetoken k3s server --server https://myserver:6443

修改环境变量

echo 'PATH=$PATH:/usr/local/bin'>>/etc/profile

检查集群状态

kubectl config get-clusters
kubectl cluster-info
kubectl get nodes
kubectl get namespaces
kubectl get endpoints -n kube-system
kubectl get pods -n kube-system

实例管理

crictl ps
docker ps

管理界面安装及启动

GITHUB_URL=https://github.com/kubernetes/dashboard/releases
VERSION_KUBE_DASHBOARD=$(curl -w '%{url_effective}' -I -L -s -S ${GITHUB_URL}/latest -o /dev/null | sed -e 's|.*/||')
k3s kubectl create -f https://raw.githubusercontent.com/kubernetes/dashboard/${VERSION_KUBE_DASHBOARD}/aio/deploy/recommended.yaml

cat << EOF >dashboard.admin-user.yml
apiVersion: v1
kind: ServiceAccount
metadata:
  name: admin-user
  namespace: kubernetes-dashboard
EOF

cat << EOF >dashboard.admin-user-role.yml
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: admin-user
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: cluster-admin
subjects:
  - kind: ServiceAccount
    name: admin-user
    namespace: kubernetes-dashboard
EOF

k3s kubectl create -f dashboard.admin-user.yml -f dashboard.admin-user-role.yml
k3s kubectl -n kubernetes-dashboard describe secret admin-user-token | grep ^token
k3s kubectl proxy --accept-hosts='.*' --address='0.0.0.0'

查看 token

kubectl -n kube-system describe $(kubectl -n kube-system get secret -n kube-system -o name | grep namespace) | grep token