Easypack: Ansible方式部署工具中增加Metrics Server支持

本是古典何须时尚 2023-07-03 04:41 23阅读 0赞

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在Easypack中提供了多套Kubernetes快速部署的工具，基于Bash脚本和Ansible的，Ansible的方式也有基于K3S和普通的Kubernetes的两种。这篇文章介绍一下普通Kubernetes版本下的Ansible部署工具中如何增加Metrics Server的支持。

# 事前准备 #

本文使用Kubernetes 1.17.2，可参看下文进行快速环境搭建：

*  [单机版本或者集群版本环境搭建][Link 1]

[root@host131 ansible]# kubectl get node -o wide
    NAME              STATUS   ROLES    AGE     VERSION   INTERNAL-IP       EXTERNAL-IP   OS-IMAGE                KERNEL-VERSION          CONTAINER-RUNTIME
    192.168.163.131   Ready    <none>   3m49s   v1.17.2   192.168.163.131   <none>        CentOS Linux 7 (Core)   3.10.0-957.el7.x86_64   docker://19.3.5
    [root@host131 ansible]#

*  事前环境确认: service、pod与deployment

[root@host131 ansible]# kubectl get service -A |grep metrics
    [root@host131 ansible]# kubectl get pod -A |grep metrics
    [root@host131 ansible]# kubectl get deployment -A |grep metrics
    [root@host131 ansible]#

*  事前环境确认: kubectl top命令

[root@host131 ansible]# kubectl top pod
    Error from server (NotFound): the server could not find the requested resource (get services http:heapster:)
    [root@host131 ansible]# kubectl top node
    Error from server (NotFound): the server could not find the requested resource (get services http:heapster:)
    [root@host131 ansible]#

# Metrics Server安装 #

## 安装Metrics Server ##

执行如下命令即可完成Metrics Server的安装

[root@host131 ansible]# ansible-playbook metrics/tests/test.yml 
    
    PLAY [localhost] *********************************************************************************************************************************
    
    TASK [metrics : create dirs for metrics] *********************************************************************************************************
    changed: [localhost] => (item=/etc/k8s/metrics)
    
    TASK [metrics : copy metrics yaml file] **********************************************************************************************************
    changed: [localhost] => (item=aggregated-metrics-reader.yaml)
    changed: [localhost] => (item=auth-delegator.yaml)
    changed: [localhost] => (item=auth-reader.yaml)
    changed: [localhost] => (item=metrics-apiservice.yaml)
    changed: [localhost] => (item=metrics-server-service.yaml)
    changed: [localhost] => (item=resource-reader.yaml)
    
    TASK [metrics : create metrics server deployment yaml file] **************************************************************************************
    changed: [localhost]
    
    TASK [metrics : load metrics server image] *******************************************************************************************************
    changed: [localhost]
    
    TASK [metrics : create metrics service] **********************************************************************************************************
    changed: [localhost]
    
    TASK [metrics : confirm metrics service state] ***************************************************************************************************
    changed: [localhost]
    
    PLAY RECAP ***************************************************************************************************************************************
    localhost                  : ok=6    changed=6    unreachable=0    failed=0   
    
    [root@host131 ansible]#

## 结果确认 ##

使用kubectl命令可以确认到，pod、deployment以及service全部生成并正常运行

[root@host131 ansible]# kubectl get service -A |grep metrics
    kube-system   metrics-server   ClusterIP   10.254.47.213   <none>        443/TCP         2m36s
    [root@host131 ansible]# kubectl get pod -A |grep metrics
    kube-system   metrics-server-5cc8d5c4df-qcpg6   1/1     Running   0          2m43s
    [root@host131 ansible]# kubectl get deployment -A |grep metrics
    kube-system   metrics-server   1/1     1            1           2m56s
    [root@host131 ansible]#

*  确认kubectl top命令

[root@host131 ansible]# kubectl top node
    NAME              CPU(cores)   CPU%   MEMORY(bytes)   MEMORY%   
    192.168.163.131   100m         10%    2588Mi          67%       
    [root@host131 ansible]# 
    [root@host131 ansible]# kubectl top pod metrics-server-5cc8d5c4df-qcpg6  -n kube-system
    NAME                              CPU(cores)   MEMORY(bytes)   
    metrics-server-5cc8d5c4df-qcpg6   1m           11Mi            
    [root@host131 ansible]#

# Ansible脚本 #

> github地址：https://github.com/liumiaocn/easypack/tree/master/k8s/ansible

*  各组件版本

<table> 
 <thead> 
  <tr> 
   <th>组件</th> 
   <th>版本</th> 
   <th>更新时间</th> 
   <th>获取地址</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>cfssl</td> 
   <td>1.2</td> 
   <td>2016/3/30</td> 
   <td>https://pkg.cfssl.org/</td> 
  </tr> 
  <tr> 
   <td>flannel</td> 
   <td>0.11.0</td> 
   <td>2019/1/29</td> 
   <td>https://github.com/coreos/flannel</td> 
  </tr> 
  <tr> 
   <td>pause</td> 
   <td>3.1</td> 
   <td>-</td> 
   <td>gcr.io/google_containers/pause-amd64:3.1</td> 
  </tr> 
  <tr> 
   <td>kubernetes</td> 
   <td>1.17.2</td> 
   <td>2020/1/21</td> 
   <td>https://dl.k8s.io</td> 
  </tr> 
  <tr> 
   <td>etcd</td> 
   <td>3.3.18</td> 
   <td>2019/11/27</td> 
   <td>https://github.com/etcd-io/etcd/releases</td> 
  </tr> 
  <tr> 
   <td>docker</td> 
   <td>19.03.5</td> 
   <td>2019/11/14</td> 
   <td>https://download.docker.com/</td> 
  </tr> 
  <tr> 
   <td>cni</td> 
   <td>0.8.5</td> 
   <td>2020/1/22</td> 
   <td>https://github.com/containernetworking/plugins/releases</td> 
  </tr> 
  <tr> 
   <td>coredns</td> 
   <td>1.6.7</td> 
   <td>2020/1/28</td> 
   <td>coredns/coredns:1.6.7</td> 
  </tr> 
  <tr> 
   <td>dashboard</td> 
   <td>1.10.1</td> 
   <td>-</td> 
   <td>k8s.gcr.io/kubernetes-dashboard-amd64:v1.10.1</td> 
  </tr> 
  <tr> 
   <td>prometheus</td> 
   <td>2.15.1</td> 
   <td>2019/12/25</td> 
   <td>prom/prometheus:v2.15.1</td> 
  </tr> 
  <tr> 
   <td>metrics server</td> 
   <td>0.3.6</td> 
   <td>2019/10/15</td> 
   <td>k8s.gcr.io/metrics-server-amd64 :v0.3.6</td> 
  </tr> 
 </tbody> 
</table>

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[Link 1]: https://blog.csdn.net/liumiaocn/article/details/103725251