microk8s v1.27.4部署

1、windows环境下安装vmbox虚拟机

2、下载ubuntu 服务器镜像-ubuntu-22.04.3-live-server-amd64.iso

3、新建3个ubuntu虚拟环境，分别命名为ubuntu02,ubuntu03,ubuntu04,网卡设置为桥接模式,假设主机ip为192.168.1.6，三个环境对应ip分别为192.168.1.7,192.168.1.8,192.168.1.9，分别修改/etc/hostname为主机名

4、安装ssh环境,设置允许root用户登录

apt install openssh-server -y

5、使用tabby创建三个服务器的ssh配置，连接三个服务器

6、ubuntu02作为控制主机，安装microk8s服务

sudo snap install microk8s --classic
microk8s status --wait-ready

国内用户会在这里卡住，因为下载不了镜像，解决方案参考https://microk8s.io/docs/registry-private，具体操作如下

# create a directory with the registry name
sudo mkdir -p /var/snap/microk8s/current/args/certs.d/registry.k8s.io

# create the hosts.toml file pointing to the mirror
echo '
server = "registry.k8s.io"

[host."https://registry.aliyuncs.com/v2/google_containers"]
  capabilities = ["pull", "resolve"]
  override_path = true
' | sudo tee -a /var/snap/microk8s/current/args/certs.d/registry.k8s.io/hosts.toml
# A restart of the containerd daemon helps but is not required, since changes should take effect immediately.
sudo snap restart microk8s

7、ubuntu02启动必要服务,包括面板任务

microk8s enable dashboard dns registry istio
# 使用microk8s kubectl get pods -A 发现有dashboard服务镜像metrics-server无法拉取，从阿里云拉取并tag即可
microk8s ctr image pull registry.cn-hangzhou.aliyuncs.com/google_containers/metrics-server:v0.5.2
microk8s ctr image tag  registry.cn-hangzhou.aliyuncs.com/google_containers/metrics-server:v0.5.2  registry.k8s.io/metrics-server/metrics-server:v0.5.2

8 、ubuntu03和ubuntu04作为服务节点，安装步骤同理，如下

sudo snap install microk8s --classic
microk8s status --wait-ready # 设置使用国内源，参考主机
microk8s enable dns registry istio # 启动必要服务，排除面板服务

9、主机ubuntu02添加节点ubuntu03，执行命令microk8s add-node，加入信息如下:

From the node you wish to join to this cluster, run the following:
microk8s join 192.168.1.7:25000/8f6f92d867d4244a5da27fb5c4d150f5/fd98fbd2e263

Use the '--worker' flag to join a node as a worker not running the control plane, eg:
microk8s join 192.168.1.7:25000/8f6f92d867d4244a5da27fb5c4d150f5/fd98fbd2e263 --worker

If the node you are adding is not reachable through the default interface you can use one of the following:
microk8s join 192.168.1.7:25000/8f6f92d867d4244a5da27fb5c4d150f5/fd98fbd2e263
microk8s join 2408:823c:5616:a414:a00:27ff:fe4f:7e91:25000/8f6f92d867d4244a5da27fb5c4d150f5/fd98fbd2e263
# 在ubuntu03节点作为woker执行加入操作
microk8s join 192.168.1.7:25000/8f6f92d867d4244a5da27fb5c4d150f5/fd98fbd2e263 --worker

如果主机没有设置dns关系，会出现如下提示报错：

Connection failed. The hostname (ubuntu03) of the joining node does not resolve to the IP "192.168.1.8". Refusing join (400)

这个时候需要主机hosts指明关系，将如下内容加入/etc/hosts中，然后使用service nscd restart命令使其生效，重复如上操作即可完成加入

192.168.1.7 ubuntu02
192.168.1.8 ubuntu03
192.168.1.9 ubuntu04

10、如同步骤9，添加节点ubuntu04,然后在主机使用命令microk8s kubectl get no可以看到加入集群的所有节点,即完成集群部署：

NAME       STATUS   ROLES    AGE     VERSION
ubuntu03   Ready    <none>   3m22s   v1.27.4
ubuntu02   Ready    <none>   105m    v1.27.4
ubuntu04   Ready    <none>   33s     v1.27.4

补充命令，查看节点所有服务microk8s kubectl get all --all-namespaces，打开主机控制面板microk8s dashboard-proxy