需求，在多台服务器一键部署kubernetes应用服务，并完成依赖的数据库/中间件的初始化。同时支持自定义启动参数。

思路：

1)将application.yml中的配置文件(如spring.application.datasource.url)变量作为ansible的变量暴露出来。

2)k8s中ConfigMap中使用ansible暴露出来的参数

3)k8s中Deployment设置启动参数args[] 引用k8s中ConfigMap

ansible目录结构

.
└── v1.0
    ├── playbook.yaml
    ├── res
    │   └── sql
    │       └── local_account.sql
    ├── roles
    │   ├── app
    │   │   ├── tasks
    │   │   │   └── main.yaml
    │   │   ├── templates
    │   │   │   └── deploy.yaml.j2
    │   │   └── vars
    │   │       └── main.yaml
    │   └── mysqlinit
    │       ├── tasks
    │       │   └── main.yaml
    │       └── vars
    │           └── main.yaml
    └── tags.yaml

playbook.yaml

- name: 1.mysqlinit
  hosts: mysqlinit
  roles:
    - role: mysqlinit
      become: yes

- name: 2.start deploy demo
  hosts: app
  roles:
    - role: app
      become: yes

mysqlinit：初始化数据库表结构等

start deploy demo：部署k8s应用服务

mysql初始化roles

- name: "create database"
  shell: "mysql -h 127.0.0.1 -u{{mysql_username}} -p{{mysql_password}} -P3306 -e 'create database  `cornorstone`; use  `cornorstone`;CREATE TABLE user_info (
                                                                                                                               id varchar(255) NOT NULL,
                                                                                                                               name varchar(32) DEFAULT NULL,
                                                                                                                               pwd varchar(64) DEFAULT NULL,
                                                                                                                               PRIMARY KEY (id)
                                                                                                                             ) ; '"
  ignore_errors: True

部署k8s应用roles

vars/main.yaml (变量信息)

mysql_host: "jdbc:mysql://xxxxxx:3306/xxxx?useSSL=false"
mysql_username: "root"
mysql_password: "xxxxxx"
redis_host: "xxxxx"
redis_port: "6379"
redis_password: "123456"

templates/deploy.yaml.j2

---
 apiVersion: v1
 kind: Service
 metadata:
   name: show-demo-service
 spec:
   type: NodePort
   selector:
     app: show-demo
   ports:
    - port: 80
      targetPort: 8088
      nodePort: 30089
---
 apiVersion: extensions/v1beta1
 kind: Deployment
 metadata:
   name: show-demo-deployment
 spec:
   replicas: 2
   template:
     metadata:
       labels:
         app: show-demo
     spec:
       containers:
         - name: show-demo
           image: registry.cn-shanghai.aliyuncs.com/glodoncornerstone/show_demo:latest
           imagePullPolicy: IfNotPresent
           args: [
                 "--spring.datasource.master.jdbc-url=$(mysql_host)",
                 "--spring.datasource.master.username=$(mysql_username)",
                 "--spring.datasource.master.password=$(mysql_password)",

                 "--spring.datasource.slave.jdbc-url=$(mysql_host)",
                 "--spring.datasource.slave.username=$(mysql_username)",
                 "--spring.datasource.slave.password=$(mysql_password)",

                 "--spring.redis.host=$(redis_host)",
                 "--spring.redis.port=$(redis_port)",
                 "--spring.redis.password=$(redis_password)"
           ]
           env:
             - name: mysql_host
               valueFrom:
                  configMapKeyRef:
                    name: show-demo-configmap
                    key: mysql_host
             - name: mysql_username
               valueFrom:
                  configMapKeyRef:
                    name: show-demo-configmap
                    key: mysql_username
             - name: mysql_password
               valueFrom:
                  configMapKeyRef:
                    name: show-demo-configmap
                    key: mysql_password
             - name: redis_host
               valueFrom:
                  configMapKeyRef:
                    name: show-demo-configmap
                    key: redis_host
             - name: redis_port
               valueFrom:
                  configMapKeyRef:
                    name: show-demo-configmap
                    key: redis_port
             - name: redis_password
               valueFrom:
                  configMapKeyRef:
                    name: show-demo-configmap
                    key: redis_password
           ports:
             - containerPort: 8088
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: show-demo-configmap
data:
  mysql_host: "{{mysql_host}}"
  mysql_username: "{{mysql_username}}"
  mysql_password: "{{mysql_password}}"
  redis_host: "{{redis_host}}"
  redis_port: "{{redis_port}}"
  redis_password: "{{redis_password}}"

tasks/main.yaml

- name: init deploy.yaml
  shell: "kubectl delete -f /deploy.yaml"
  ignore_errors: True
- name: "copy deploy.yaml"
  template:
    src: "deploy.yaml.j2"
    dest: "/"
- name: remane  deploy.yaml
  shell: "cp /deploy.yaml.j2 /deploy.yaml"
  ignore_errors: True
- name: execute apply -f deploy.yaml
  shell: "kubectl apply -f /deploy.yaml"
  ignore_errors: True