saltsack自动化配置day02：之配置管理-YAML编写技巧

1. 概述和内容

salt包含一个健壮且灵活的配置管理框架，它构建在远程执行核心上。这个框架运行于minion上，它通过特定呈现语言的state文件，即可轻松地同时配置成千上万的主机。

后面配置管理所介绍的内容有： 
* file_roots 
设置状态文件的位置

env 
Base环境 
开发、测试、预生产环境、生产环境

SLS 
YAML 
Jinja 
编写技巧

state模块 
file 
pkg 
service 
cmd

state关系 
require 
require_in 
watch 
watch_in 
unless 
onlyif

实践案例 
LAMP 
LNMP 
Zabbix 
Haproxy+keepalived

项目实战 
OpenStack自动化部署

2. YAML编写技巧

2.1 缩进

• YAML使用一个固定的缩进风格表示数据层结构关系。salt需要每个缩进级别使用2个空格。
• 不要使用table键。

2.2 冒号

冒号2边表示key和value。

my_key: my_value
    second_key: second_value

2.3 短横线

想要表示列表项，使用一个短横杠加一个空格。多个项使用同样的缩进级别作为同一列表的一部分。

my_dictionary:
  - list_value_one
  - list_value_two
  - list_value_three

3. 同步文件实战

下面介绍同步Linux下dns配置文件/etc/resolv.conf。

vim /etc/salt/master

state_top: top.sls

file_roots:
  base:
    - /srv/salt
  dev:
    - /srv/salt/dev
  test:
    - /srv/salt/test
  prod:
    - /srv/salt/prod

　

[root@salt-master salt]# mkdir dev test prod
[root@salt-master salt]# cat top.sls 
yaml
base:
  '*':
    - init.dns
[root@salt-master salt]# cat init/dns.sls 
/etc/resolv.conf:
  file.managed:
    - source:
      - salt://init/files/resolv.conf
    - user: root
    - group: root
    - mode: 644
[root@salt-master salt]# cat init/files/resolv.conf 
nameserver 10.1.0.2
nameserver 114.114.114.114
执行文件同步

　　

　

[root@salt-master salt]# salt '*' state.highstate
node1.test.com:
----------
          ID: /etc/resolv.conf
    Function: file.managed
      Result: True
     Comment: File /etc/resolv.conf updated
     Started: 17:50:20.016276
    Duration: 39.221 ms
     Changes:   
              ----------
              diff:
                  ---  
                  +++  
                  @@ -1,3 +1,2 @@
                  -# Generated by NetworkManager
                   nameserver 10.1.0.2
                   nameserver 114.114.114.114

Summary for node1.test.com
------------
Succeeded: 1 (changed=1)
Failed:    0
------------
Total states run:     1
Total run time:  39.221 ms
master.test.com:
----------
          ID: /etc/resolv.conf
    Function: file.managed
      Result: True
     Comment: File /etc/resolv.conf updated
     Started: 01:47:36.747919
    Duration: 32.041 ms
     Changes:   
              ----------
              diff:
                  --- 
                  +++ 
                  @@ -1,3 +1,2 @@
                  -# Generated by NetworkManager
                   nameserver 10.1.0.2
                   nameserver 114.114.114.114

Summary for master.test.com
------------
Succeeded: 1 (changed=1)
Failed:    0
------------
Total states run:     1
Total run time:  32.041 ms
node2.test.com:
----------
          ID: /etc/resolv.conf
    Function: file.managed
      Result: True
     Comment: File /etc/resolv.conf updated
     Started: 17:50:20.642481
    Duration: 58.623 ms
     Changes:   
              ----------
              diff:
                  ---  
                  +++  
                  @@ -1,3 +1,2 @@
                  -# Generated by NetworkManager
                   nameserver 10.1.0.2
                   nameserver 114.114.114.114

Summary for node2.test.com
------------
Succeeded: 1 (changed=1)
Failed:    0
------------
Total states run:     1
Total run time:  58.623 ms
[root@salt-master salt]# .test.com:
----------
          ID: /etc/resolv.conf
    Function: file.managed
      Result: True
     Comment: File /etc/resolv.conf updated
     Started: 01:40:04.210096
    Duration: 29.966 ms
     Changes:   
              ----------
              diff:
                  --- 
                  +++ 
                  @@ -1,2 +1,3 @@
                   # Generated by NetworkManager
                   nameserver 10.1.0.2
                  +nameserver 114.114.114.114

Summary for master.test.com
------------
Succeeded: 1 (changed=1)
Failed:    0
------------
Total states run:     1
Total run time:  29.966 ms
node1.test.com:
----------
          ID: /etc/resolv.conf
    Function: file.managed
      Result: True
     Comment: File /etc/resolv.conf updated
     Started: 17:42:47.647214
    Duration: 50.04 ms
     Changes:   
              ----------
              diff:
                  ---  
                  +++  
                  @@ -1,2 +1,3 @@
                  -
                  +# Generated by NetworkManager
                   nameserver 10.1.0.2
                  +nameserver 114.114.114.114

Summary for node1.test.com
------------
Succeeded: 1 (changed=1)
Failed:    0
------------
Total states run:     1
Total run time:  50.040 ms
node2.test.com:
----------
          ID: /etc/resolv.conf
    Function: file.managed
      Result: True
     Comment: File /etc/resolv.conf updated
     Started: 17:42:48.218295
    Duration: 70.125 ms
     Changes:   
              ----------
              diff:
                  ---  
                  +++  
                  @@ -1,2 +1,3 @@
                  -
                  +# Generated by NetworkManager
                   nameserver 10.1.0.2
                  +nameserver 114.114.114.114

Summary for node2.test.com
------------
Succeeded: 1 (changed=1)
Failed:    0
------------
Total states run:     1
Total run time:  70.125 ms

在minion端查看下/etc/resolv.conf。

[root@im109 ~]# cat /etc/resolv.conf
nameserver 10.1.0.2
nameserver 114.114.114.114
[root@im109 ~]#