在线安装Microk8s

1. 安装snap

yum install -y epel-release
yum install -y snapd
systemctl enable --now snapd.socket
systemctl start snapd
ln -s /var/lib/snapd/snap /snap

2. 安装microk8s

snap install microk8s --classic --channel=1.23/stable
snap alias microk8s.kubectl kubectl

3. 安装microk8s插件(addons)

microk8s enable dns ingress metrics-server

成功安装后，通过kubectl查看Pod和Image

# kubectl get pods -A
kube-system   calico-node-srvfr                         1/1     Running   0          11m
kube-system   calico-kube-controllers-5b577d865-xwqjh   1/1     Running   0          11m
kube-system   coredns-64c6478b6c-fcvkk                  1/1     Running   0          23s
ingress       nginx-ingress-microk8s-controller-rqtj2   1/1     Running   0          32s
kube-system   metrics-server-679c5f986d-vb6z7           1/1     Running   0          53m

microk8s.ctr i list | grep -vw DIGEST | grep -v ^sha256 | grep -v @sha256 | awk '{print $1}'
docker.io/calico/cni:v3.19.1
docker.io/calico/kube-controllers:v3.17.3
docker.io/calico/node:v3.19.1
docker.io/calico/pod2daemon-flexvol:v3.19.1
docker.io/coredns/coredns:1.8.0
k8s.gcr.io/ingress-nginx/controller:v1.5.1
k8s.gcr.io/metrics-server/metrics-server:v0.5.2
k8s.gcr.io/pause:3.1

离线安装Microk8s

1. 在可联网的环境下载Microk8s的snap安装包

snap download microk8s --channel=1.23/stable # 下载指定版本1.23

2. 将下载好的snap包传输到目标机器上，安装microk8s

snap ack microk8s_<版本号>.assert
snap install microk8s_<版本号>.snap --classic

3. 启动Microk8s服务

microk8s start

4. 启动microk8s插件(可选)

在可联网的环境下载Microk8s插件的Image并导出

microk8s.ctr i list | grep -vw DIGEST | grep -v ^sha256 | grep -v @sha256 | awk '{print $1}'
docker.io/calico/cni:v3.19.1
docker.io/calico/kube-controllers:v3.17.3
docker.io/calico/node:v3.19.1
docker.io/calico/pod2daemon-flexvol:v3.19.1
docker.io/coredns/coredns:1.8.0
k8s.gcr.io/ingress-nginx/controller:v1.5.1
k8s.gcr.io/metrics-server/metrics-server:v0.5.2
k8s.gcr.io/pause:3.1

microk8s.ctr i export cni.tar docker.io/calico/cni:v3.19.1
microk8s.ctr i export kube-controllers.tar docker.io/calico/kube-controllers:v3.17.3
microk8s.ctr i export .....

将image传到目标机器上并导入

microk8s.ctr image import *.tar

启动microk8s插件

microk8s enable dns ingress metrics-server
microk8s status --wait-ready

配置kubectl访问Microk8s

microk8s.kubectl config view --raw > $HOME/.kube/config

卸载microk8s

microk8s stop 
snap remove microk8s
rm -rf /root/.kube