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
func
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
https://www.ttlsa.com/saltstack/centralized-management-of-saltstack-based-configuration/