运维编排场景系列---在ECS实例上运行Ansible-playbook

2022-03-07 21:14:00

场景介绍

Ansible是一个简单的自动化运维管理工具，基于Python语言实现，由Paramiko和PyYAML两个关键模块构建，可用于自动化部署应用、配置、编排task(持续交付、无宕机更新等)。本文介绍通过OOS在实例中运行指定OSS中的PlayBook。

模板介绍

模板内容：

FormatVersion: OOS-2019-06-01
Description: Use this template to run Ansible playbooks on ECS Instance.
Parameters:
  instanceId:
    Description: The ID of ECS Instance.
    Type: String
    MaxLength: 30
    MinLength: 1
  playbookurl:
    Type: String
    Description: "You must specify a URL where the playbook is stored.You can specify the URL in the following formats: http://example.com/playbook.yml"
    AllowedPattern: ^\s*$|^(http|https)://[^']*$
  extravars:
    Type: String
    Description: 'Additional variables to pass to Ansible at runtime. Enter a space separated list of key/value
      pairs. For example: color=red flavor=lime'
    Default: SSM=True
    AllowedPattern: ^$|^\w+\=\S+(\s\w+\=\S+)*$
  check:
    Type: String
    Description: 'Use the check parameter to perform a dry run of the Ansible execution.'
    AllowedValues:
    - 'True'
    - 'False'
    Default: 'False'
  OOSAssumeRole:
    Description: The RAM role to be assumed by OOS.
    Type: String
    Default: OOSServiceRole
RamRole: '{{ OOSAssumeRole }}'
Tasks:
- Name: runCommand
  Action: ACS::ECS::RunCommand
  Properties:
    commandContent:
      Fn::Join:
        - ' '
        - - ansible --version;
          - if [ $? -ne 0 ]; then
          -   echo "Ansible is not installed. Please install Ansible and rerun the command" >&2;
          -   exit 1;
          - fi;
          - if [[ {{playbookurl}} == http* ]]; then
          -   wget {{playbookurl}} -O playbook.yml;
          -   if [ $? -ne 0 ]; then
          -     echo "There was a problem downloading the playbook. Make sure the URL is correct and that the playbook exists.">&2;
          -     exit 1;
          -   fi;
          - fi;
          - if  [[ {{check}} == True ]] ; then
          -     ansible-playbook --check -c local -e {{extravars}} playbook.yml;
          - else
          -     ansible-playbook -c local -e {{extravars}} playbook.yml;
          - fi;
    instanceId: '{{ instanceId }}'
    commandType: RunShellScript
  Outputs:
    commandOutput:
      Type: String
      ValueSelector: invocationOutput
Outputs:
  commandOutput:
    Type: String
    Value: '{{ runCommand.commandOutput }}'

2.模板参数：

instanceId：实例ID
playbookurl：playbook下载路径
extravars：运行剧本的参数
check：检测模式

3.剧本介绍：
在oss中准备一个需要运行的剧本：

本文所用剧本内容如下：

---
- hosts: local
  connection: local
  become: yes
  become_user: root
  tasks:
   - name: Install Nginx
     yum:
       name: nginx
       state: installed
       update_cache: true

4.实例介绍：
准备一台已安装Ansible实例，Ansible的hosts配置如下：