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如何在Centos7上安装Microk8s

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本文字数： 2.1k 阅读时长 ≈ 2 分钟

在线安装Microk8s

  1. 安装snap

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    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

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snap install microk8s --classic --channel=1.23/stable
snap alias microk8s.kubectl kubectl
  1. 安装microk8s插件(addons)
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    microk8s enable dns ingress metrics-server

成功安装后，通过kubectl查看Pod和Image

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# 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

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    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

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

  3. 启动Microk8s服务

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    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

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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

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microk8s.ctr image import *.tar

启动microk8s插件

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

配置kubectl访问Microk8s

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

卸载microk8s

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