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