基于saltstack实现的配置集中化管理

Saltstack是一个具备puppet与func功能为一身的集中化管理平台，saltstack基于python实现，功能十分强大，各模块融合度及复用性极高，官方极力推荐作为云计算平台的基础架构。轻松维护成千上万台服务器不是问题，现分享作者基于saltstack实现一个集中化的配置管理平台，以Nginx配置例子展开，涉及salt的grains、grains_module、pillar、States、jinja（template）等，本文适合有salt基础的同学阅读。

一、设备环境说明
有两组web业务服务器，组名分别为web1group与web2group，设备硬件配置、web根目录存在异常.

id				groupsnode		cpus	webroot
SN2012-07-010	web1group		2		/www
SN2012-07-011	web1group		4		/www
SN2012-07-012	web1group		2		/www
SN2013-08-021	web2group		2		/data
SN2013-08-022	web2group		2		/data

二、master配置说明
1、关键配置定义：

nodegroups:  
   web1group: 'L@SN2012-07-010,SN2012-07-011,SN2012-07-012'  
   web2group: 'L@SN2013-08-021,SN2013-08-022'  

file_roots:  
  base:  
    - /srv/salt  

pillar_roots:  
  base:  
    - /srv/pillar

2、定义的文件树结构

三、自定义grains_module
1）#vi /srv/salt/_grains/nginx_config.py

import os,sys,commands  

def NginxGrains():  
    ''' 
        return Nginx config grains value 
    '''  
    grains = {}  
    max_open_file=65536  
    #Worker_info={'cpus2':'01 10','cpus4':'1000 0100 0010 0001','cpus8':'10000000 01000000 00100000 00010000 00001000 00000100 00000010 00000001'}  
    try:  
        getulimit=commands.getstatusoutput('source /etc/profile;ulimit -n')  
    except Exception,e:  
        pass  
    if getulimit[0]==0:  
        max_open_file=int(getulimit[1])  
    grains['max_open_file'] = max_open_file  
    return grains

2)同步grains模块

# salt ‘*’ saltutil.sync_all

3)刷新模块(让minion编译模块)

# salt ‘*’ sys.reload_modules

4)验证max_open_file key的value

[root@SN2013-08-020 _grains]# salt '*' grains.item max_open_file              
SN2013-08-022:
  max_open_file: 1024
SN2013-08-021:
  max_open_file: 1024
SN2012-07-011:
  max_open_file: 1024
SN2012-07-012:
  max_open_file: 1024
SN2012-07-010:
  max_open_file: 1024

四、配置pillar
本例使用分组规则定义pillar，即不同分组引用各自的sls属性
1)定义入口top.sls
#vi /srv/pillar/top.sls

base:  
  web1group:  
    - match: nodegroup  
    - web1server  
  web2group:  
    - match: nodegroup  
    - web2server

2)定义私有配置，本例只配置web_root的数据，当然可以根据不同需求进行定制，格式为python的字典形式，即”key:value”。

#vi /srv/pillar/web1server.sls 
nginx:  
    root: /www  

#vi /srv/pillar/web2server.sls 
nginx:  
    root: /data

3）验证配置结果：

#salt 'SN2013-08-021' pillar.data nginx
SN2013-08-021:
    ----------
    root:
        /data

#salt 'SN2012-07-010' pillar.data nginx 
SN2012-07-010:
    ----------
    root:
        /www

五、配置States

1）定义入口top.sls

#vi /srv/salt/top.sls
base:  
  '*':  
    - nginx

2)定义nginx配置及重启服务SLS,其中salt://nginx/nginx.conf为配置模板文件位置。

#vi /srv/salt/nginx.sls
view plainprint?
nginx:  
  pkg:  
   - installed  
  file.managed:  
   - source: salt://nginx/nginx.conf  
   - name: /etc/nginx/nginx.conf  
   - user: root  
   - group: root  
   - mode: 644  
   - template: jinja  

  service.running:  
   - enable: True  
   - reload: True  
   - watch:  
     - file: /etc/nginx/nginx.conf  
     - pkg: nginx

3）Nginx配置文件（引用jinja模板）
功能点：
1、worker_processes参数采用grains[‘num_cpus’] 上报值（与设备CPU核数一致）；
2、worker_cpu_affinity分配多核CPU根据当前设备核数进行匹配，分别为2\4\8\其它核；
3、worker_rlimit_nofile参数与grains[‘max_open_file’] 获取的系统ulimit -n一致；
4、worker_connections 参数理论上为grains[‘max_open_file’]；
5、 root参数为定制的pillar[‘nginx’][‘root’]值。

#vi /srv/salt/nginx/nginx.conf
# For more information on configuration, see:  
user              nginx;  
worker_processes  {{ grains['num_cpus'] }};  
{% if grains['num_cpus'] == 2 %}  
worker_cpu_affinity 01 10;  
{% elif grains['num_cpus'] == 4 %}  
worker_cpu_affinity 1000 0100 0010 0001;  
{% elif grains['num_cpus'] >= 8 %}  
worker_cpu_affinity 00000001 00000010 00000100 00001000 00010000 00100000 01000000 10000000;  
{% else %}  
worker_cpu_affinity 1000 0100 0010 0001;  
{% endif %}  
worker_rlimit_nofile {{ grains['max_open_file'] }};  

error_log  /var/log/nginx/error.log;  
#error_log  /var/log/nginx/error.log  notice;  
#error_log  /var/log/nginx/error.log  info;  

pid        /var/run/nginx.pid;  

events {  
    worker_connections  {{ grains['max_open_file'] }};  
}  

http {  
    include       /etc/nginx/mime.types;  
    default_type  application/octet-stream;  

    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '  
                      '$status $body_bytes_sent "$http_referer" '  
                      '"$http_user_agent" "$http_x_forwarded_for"';  

    access_log  /var/log/nginx/access.log  main;  

    sendfile        on;  
    #tcp_nopush     on;  

    #keepalive_timeout  0;  
    keepalive_timeout  65;  

    #gzip  on;  

    # Load config files from the /etc/nginx/conf.d directory  
    # The default server is in conf.d/default.conf  
    #include /etc/nginx/conf.d/*.conf;  
    server {  
        listen       80 default_server;  
        server_name  _;  

        #charset koi8-r;  

        #access_log  logs/host.access.log  main;  

        location / {  
            root   {{ pillar['nginx']['root'] }};  
            index  index.html index.htm;  
        }  

        error_page  404              /404.html;  
        location = /404.html {  
            root   /usr/share/nginx/html;  
        }  

        # redirect server error pages to the static page /50x.html  
        #  
        error_page   500 502 503 504  /50x.html;  
        location = /50x.html {  
            root   /usr/share/nginx/html;  
        }  

    }  

}

4)同步配置

#salt ‘*’ state.highstate

5）验证结果：
注意查看root定义值和worker_processes值。
1、登录root@SN2013-08-021

#vi /etc/nginx/nginx.conf

2、登录root@SN2012-07-010

#vi /etc/nginx/nginx.conf

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