kubeasz基于ezctl实现k8s集群的扩容和缩容

博客园 - 尹正杰

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尹正杰 · 2026-02-15 · via 博客园 - 尹正杰

　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　作者：尹正杰

一.扩容k8s节点
二.伸缩node节点
- 1.扩容worker节点
- 2.缩容worker节点

一.扩容k8s节点

1.查看现有的节点

[root@master231 ~]# kubectl get nodes -o wide
NAME        STATUS                     ROLES    AGE     VERSION    INTERNAL-IP   EXTERNAL-IP   OS-IMAGE             KERNEL-VERSION      CONTAINER-RUNTIME
master231   Ready,SchedulingDisabled   master   5h23m   v1.33.11   10.0.0.231    <none>        Ubuntu 24.04.4 LTS   6.8.0-117-generic   containerd://2.1.1
master232   Ready,SchedulingDisabled   master   5h23m   v1.33.11   10.0.0.232    <none>        Ubuntu 24.04.4 LTS   6.8.0-117-generic   containerd://2.1.1
worker66    Ready                      node     5h21m   v1.33.11   10.0.0.66     <none>        Ubuntu 24.04.4 LTS   6.8.0-117-generic   containerd://2.1.1
worker77    Ready                      node     5h21m   v1.33.11   10.0.0.77     <none>        Ubuntu 24.04.4 LTS   6.8.0-117-generic   containerd://2.1.1
[root@master231 ~]# 
[root@master231 ~]# ps -ef | grep kube-lb
root        4348       1  0 02:58 ?        00:00:00 nginx: master process /etc/kube-lb/sbin/kube-lb -c /etc/kube-lb/conf/kube-lb.conf -p /etc/kube-lb
root      181504    1413  0 08:24 pts/0    00:00:00 grep --color=auto kube-lb
[root@master231 ~]# 
[root@master231 ~]# cat /etc/kube-lb/conf/kube-lb.conf
user root;
worker_processes 1;

error_log  /etc/kube-lb/logs/error.log warn;

events {
    worker_connections  3000;
}

stream {
    upstream backend {
        server 10.0.0.231:6443    max_fails=2 fail_timeout=3s;
        server 10.0.0.232:6443    max_fails=2 fail_timeout=3s;
    }

    server {
        listen 127.0.0.1:6443;
        proxy_connect_timeout 1s;
        proxy_pass backend;
    }
}
[root@master231 ~]#

2.扩容master节点

  1.新增master节点
[root@ansible99 ~]# /etc/kubeasz/ezctl add-master yinzhengjie-k8s 10.0.0.233 k8s_nodename='master233'


   2. 本质上会自动更新 hosts 文件，将新 Master IP 加入 [kube_master] 组
[root@ansible99 ~]# vim /etc/kubeasz/clusters/yinzhengjie-k8s/hosts 
...
[kube_master]
10.0.0.233 k8s_nodename=master233
10.0.0.231 k8s_nodename='master231'
10.0.0.232 k8s_nodename='master232'


  3.检查master组件
[root@master231 ~]# kubectl get nodes -o wide
NAME             STATUS                        ROLES    AGE     VERSION    INTERNAL-IP   EXTERNAL-IP   OS-IMAGE             KERNEL-VERSION      CONTAINER-RUNTIME
master231        Ready,SchedulingDisabled      master   5h57m   v1.33.11   10.0.0.231    <none>        Ubuntu 24.04.4 LTS   6.8.0-117-generic   containerd://2.1.1
master232        Ready,SchedulingDisabled      master   5h57m   v1.33.11   10.0.0.232    <none>        Ubuntu 24.04.4 LTS   6.8.0-117-generic   containerd://2.1.1
master233        Ready,SchedulingDisabled      master   2m50s   v1.33.11   10.0.0.233    <none>        Ubuntu 24.04.4 LTS   6.8.0-117-generic   containerd://2.1.1
worker66         Ready                         node     5h55m   v1.33.11   10.0.0.66     <none>        Ubuntu 24.04.4 LTS   6.8.0-117-generic   containerd://2.1.1
worker77         Ready                         node     5h55m   v1.33.11   10.0.0.77     <none>        Ubuntu 24.04.4 LTS   6.8.0-117-generic   containerd://2.1.1
[root@master231 ~]# 
[root@master231 ~]# ps -ef | grep kube-lb
root      199732       1  0 08:55 ?        00:00:00 nginx: master process /etc/kube-lb/sbin/kube-lb -c /etc/kube-lb/conf/kube-lb.conf -p /etc/kube-lb
root      207866    1413  0 09:09 pts/0    00:00:00 grep --color=auto kube-lb
[root@master231 ~]# 
[root@master231 ~]# cat /etc/kube-lb/conf/kube-lb.conf
user root;
worker_processes 1;

error_log  /etc/kube-lb/logs/error.log warn;

events {
    worker_connections  3000;
}

stream {
    upstream backend {
        server 10.0.0.233:6443    max_fails=2 fail_timeout=3s;  # 不难发现，会产生新的master节点哟~
        server 10.0.0.231:6443    max_fails=2 fail_timeout=3s;
        server 10.0.0.232:6443    max_fails=2 fail_timeout=3s;  
    }

    server {
        listen 127.0.0.1:6443;
        proxy_connect_timeout 1s;
        proxy_pass backend;
    }
}
[root@master231 ~]#

3.缩容master节点

  1.删除master节点
[root@ansible99 ~]# /etc/kubeasz/ezctl del-master yinzhengjie-k8s 10.0.0.232


  2.测试验证本地配置文件
[root@master231 ~]# cat /etc/kube-lb/conf/kube-lb.conf
user root;
worker_processes 1;

error_log  /etc/kube-lb/logs/error.log warn;

events {
    worker_connections  3000;
}

stream {
    upstream backend {
        server 10.0.0.233:6443    max_fails=2 fail_timeout=3s;
        server 10.0.0.231:6443    max_fails=2 fail_timeout=3s;
    }

    server {
        listen 127.0.0.1:6443;
        proxy_connect_timeout 1s;
        proxy_pass backend;
    }
}
[root@master231 ~]#

二.伸缩node节点

1.扩容worker节点

  1.配置免密
[root@ansible99 ~]# ssh-copy-id 10.0.0.88


  2.新增worker节点
[root@ansible99 ~]# /etc/kubeasz/ezctl add-node yinzhengjie-k8s 10.0.0.88 k8s_nodename='worker88'


  3.查看节点
[root@master231 ~]# kubectl get nodes -o wide
NAME        STATUS                     ROLES    AGE     VERSION    INTERNAL-IP   EXTERNAL-IP   OS-IMAGE             KERNEL-VERSION      CONTAINER-RUNTIME
master231   Ready,SchedulingDisabled   master   9h      v1.33.11   10.0.0.231    <none>        Ubuntu 24.04.4 LTS   6.8.0-117-generic   containerd://2.1.1
master232   Ready,SchedulingDisabled   master   124m    v1.33.11   10.0.0.232    <none>        Ubuntu 24.04.4 LTS   6.8.0-117-generic   containerd://2.1.1
master233   Ready,SchedulingDisabled   master   3h33m   v1.33.11   10.0.0.233    <none>        Ubuntu 24.04.4 LTS   6.8.0-117-generic   containerd://2.1.1
worker66    Ready                      node     9h      v1.33.11   10.0.0.66     <none>        Ubuntu 24.04.4 LTS   6.8.0-117-generic   containerd://2.1.1
worker77    Ready                      node     9h      v1.33.11   10.0.0.77     <none>        Ubuntu 24.04.4 LTS   6.8.0-117-generic   containerd://2.1.1
worker88    Ready                      node     4m59s   v1.33.11   10.0.0.88     <none>        Ubuntu 24.04.4 LTS   6.8.0-117-generic   containerd://2.1.1
[root@master231 ~]#

2.缩容worker节点

  1.删除指定节点
[root@ansible99 ~]# /etc/kubeasz/ezctl del-node yinzhengjie-k8s 10.0.0.88 


  2.查看节点信息
[root@master231 ~]# kubectl get nodes -o wide
NAME        STATUS                     ROLES    AGE     VERSION    INTERNAL-IP   EXTERNAL-IP   OS-IMAGE             KERNEL-VERSION      CONTAINER-RUNTIME
master231   Ready,SchedulingDisabled   master   9h      v1.33.11   10.0.0.231    <none>        Ubuntu 24.04.4 LTS   6.8.0-117-generic   containerd://2.1.1
master232   Ready,SchedulingDisabled   master   126m    v1.33.11   10.0.0.232    <none>        Ubuntu 24.04.4 LTS   6.8.0-117-generic   containerd://2.1.1
master233   Ready,SchedulingDisabled   master   3h35m   v1.33.11   10.0.0.233    <none>        Ubuntu 24.04.4 LTS   6.8.0-117-generic   containerd://2.1.1
worker66    Ready                      node     9h      v1.33.11   10.0.0.66     <none>        Ubuntu 24.04.4 LTS   6.8.0-117-generic   containerd://2.1.1
worker77    Ready                      node     9h      v1.33.11   10.0.0.77     <none>        Ubuntu 24.04.4 LTS   6.8.0-117-generic   containerd://2.1.1
[root@master231 ~]#

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博客园 - 尹正杰

一.扩容k8s节点

1.查看现有的节点

2.扩容master节点

3.缩容master节点

二.伸缩node节点

1.扩容worker节点

2.缩容worker节点