請讀者務必保持環境一致

安裝過程中需要下載所需系統包，請務必使所有節點連上互聯網。

本次安裝的集群節點信息

實驗環境：VMware的虛擬機

另外由所有 master節點提供一組VIP 192.168.77.140

本次安裝的集群拓撲圖

本次使用到的ROLE

• Ansible Role 系統環境 之【epel源設置】
• Ansible Role 系統環境 之【hostnames】
• Ansible Role 容器 之【docker】
• Ansible Role 容器 之【kubernetes】

ansible role怎麽用請看下面文章

• Ansible Role【怎麽用？】

集群安裝方式

以static pod方式安裝kubernetes ha高可用集群。

Ansible管理節點操作

OS： CentOS Linux release 7.4.1708 (Core)

安裝Ansible

# yum -y install ansible
# ansible --version
ansible 2.5.3
  config file = /etc/ansible/ansible.cfg
  configured module search path = [u‘/root/.ansible/plugins/modules‘, u‘/usr/share/ansible/plugins/modules‘]
  ansible python module location = /usr/lib/python2.7/site-packages/ansible
  executable location = /usr/bin/ansible
  python version = 2.7.5 (default, Aug  4 2017, 00:39:18) [GCC 4.8.5 20150623 (Red Hat 4.8.5-16)]
 

配置ansible

# sed -i ‘s|#host_key_checking|host_key_checking|g‘ /etc/ansible/ansible.cfg

下載role

# yum -y install git
# git clone https://github.com/kuailemy123/Ansible-roles.git /etc/ansible/roles
正克隆到 ‘/etc/ansible/roles‘...
remote: Counting objects: 1767, done.
remote: Compressing objects: 100% (20/20), done.
remote: Total 1767 (delta 5), reused 24 (delta 4), pack-reused 1738
接收對象中: 100% (1767/1767), 427.96 KiB | 277.00 KiB/s, done.
處理 delta 中: 100% (639/639), done.

下載kubernetes-files.zip文件

這是為了適應國情，導出所需的谷歌docker image，方便大家使用。

文件下載鏈接：https://pan.baidu.com/s/1BNMJLEVzCE8pvegtT7xjyQ 密碼：qm4k

# yum -y install unzip
# unzip kubernetes-files.zip -d /etc/ansible/roles/kubernetes/files/

配置主機信息

# cat /etc/ansible/hosts
[k8s-master]
192.168.77.133
192.168.77.134
192.168.77.135
[k8s-node]
192.168.77.136
192.168.77.137
192.168.77.138
[k8s-cluster:children]
k8s-master
k8s-node
[k8s-cluster:vars]
ansible_ssh_pass=123456

k8s-master組為所有的master節點主機。k8s-node組為所有的node節點主機。k8s-cluster包含k8s-master和k8s-node組的所有主機。

請註意, 主機名稱請用小寫字母, 大寫字母會出現找不到主機的問題。

配置playbook

# cat /etc/ansible/k8s.yml
---
# 初始化集群
- hosts: k8s-cluster
  serial: "100%"
  any_errors_fatal: true
  vars:
    - ipnames:
        ‘192.168.77.133‘: ‘k8s-m1‘
        ‘192.168.77.134‘: ‘k8s-m2‘
        ‘192.168.77.135‘: ‘k8s-m3‘
        ‘192.168.77.136‘: ‘k8s-n1‘
        ‘192.168.77.137‘: ‘k8s-n2‘
        ‘192.168.77.138‘: ‘k8s-n3‘
  roles:
    - hostnames
    - repo-epel
    - docker

# 安裝master節點
- hosts: k8s-master
  any_errors_fatal: true
  vars:
    - kubernetes_master: true
    - kubernetes_apiserver_vip: 192.168.77.140
  roles:
    - kubernetes

# 安裝node節點
- hosts: k8s-node
  any_errors_fatal: true
  vars:
    - kubernetes_node: true
    - kubernetes_apiserver_vip: 192.168.77.140
  roles:
    - kubernetes
    
# 安裝addons應用
- hosts: k8s-master
  any_errors_fatal: true
  vars:
    - kubernetes_addons: true
    - kubernetes_ingress_controller: nginx
    - kubernetes_apiserver_vip: 192.168.77.140
  roles:
    - kubernetes

kubernetes_ingress_controller 還可以選擇traefik

執行playbook

# ansible-playbook /etc/ansible/k8s.yml
......
real    26m44.153s
user    1m53.698s
sys 0m55.509s

驗證集群版本

# kubectl version
Client Version: version.Info{Major:"1", Minor:"10", GitVersion:"v1.10.3", GitCommit:"2bba0127d85d5a46ab4b778548be28623b32d0b0", GitTreeState:"clean", BuildDate:"2018-05-21T09:17:39Z", GoVersion:"go1.9.3", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"10", GitVersion:"v1.10.3", GitCommit:"2bba0127d85d5a46ab4b778548be28623b32d0b0", GitTreeState:"clean", BuildDate:"2018-05-21T09:05:37Z", GoVersion:"go1.9.3", Compiler:"gc", Platform:"linux/amd64"}

驗證集群狀態

kubectl -n kube-system get po -o wide -l k8s-app=kube-proxy
kubectl -n kube-system get po -l k8s-app=kube-dns
kubectl -n kube-system get po -l k8s-app=calico-node -o wide
calicoctl node status
kubectl -n kube-system get po,svc -l k8s-app=kubernetes-dashboard
kubectl -n kube-system get po,svc | grep -E ‘monitoring|heapster|influxdb‘
kubectl -n ingress-nginx get pods
kubectl -n kube-system get po -l app=helm
kubectl -n kube-system logs -f kube-scheduler-k8s-m2
helm version

這裏就不寫結果了。

查看addons訪問信息

在第一臺master服務器上

kubectl cluster-info
Kubernetes master is running at https://192.168.77.140:6443
Elasticsearch is running at https://192.168.77.140:6443/api/v1/namespaces/kube-system/services/elasticsearch-logging/proxy
heapster is running at https://192.168.77.140:6443/api/v1/namespaces/kube-system/services/heapster/proxy
Kibana is running at https://192.168.77.140:6443/api/v1/namespaces/kube-system/services/kibana-logging/proxy
kube-dns is running at https://192.168.77.140:6443/api/v1/namespaces/kube-system/services/kube-dns:dns/proxy
monitoring-grafana is running at https://192.168.77.140:6443/api/v1/namespaces/kube-system/services/monitoring-grafana/proxy
monitoring-influxdb is running at https://192.168.77.140:6443/api/v1/namespaces/kube-system/services/monitoring-influxdb:http/proxy

# cat ~/k8s_addons_access

集群部署完成後，建議重啟集群所有節點。

利用ansible來做kubernetes 1.10.3集群高可用的一鍵部署