saltstack源码详解一

@(python之路)[saltstack源码详解一]

saltstack源码详解

初识源码流程

环境准备:

# 安装
yum install salt-ssh
pip3 install salt-ssh # 命令
salt-ssh
# 配置
/etc/salt/roster
# 功能
salt-ssh "*" cmd.run "ls"

下面我们查看源码

入口

yum install salt-ssh后,他就会把代码放到python中的lib中。他会触发这个脚本

from salt.scripts import salt_ssh

if __name__ == '__main__':
salt_ssh()

他会调用这里边的东西并执行。

解析salt-ssh "*" cmd.run "ls" -i 命令

源码流程:

  • 启动命令时python脚本
  • 读取默认配置文件

    obj = salt.clissh.SaltSSH()

    obj.run()
  • 执行命令

    obj = SSH(配置文件)

    obj.run()
  • 创建进程间供享的队列;[]
  • 读取配置文件中的主机,给每个符合条件的主机创建一个进程;

    host = next(target_iter)

    routine = MultiprocessingProcess(target=self.handle_routine,args=args)

    每个进程执行得到结果后,将结果放入队列中

    ret = self.handle_routing(……)

     触发Single

      触发Shell

      触发terminal

     que.put(ret)

salt日常使用

from salt.client.ssh.shell import Shell
shell = Shell({_ssh_version:(4,9 )})
result = shell.exec_cmd("ls")
print(result)

预留python接口:

from salt.client.ssh.client import SSHClient

client = SSHClient()

ret = client.cmd('*','cmd.run',('ls',),30)
print(ret)

1.grains.items

salt-ssh '*' grains.items

grains一般用于获取服务的静态信息

自定义

# /srv/salt/_grains/xx.py
预留python接口
from salt.client.ssh.client import SSHClient
client = SSHClient()
ret = client.cmd("*",'grains.items')
print(ret)

2.pillar.items

salt-ssh "*" pillar.items

pillar一般用于获取服务器动态信息

方式一

# /srv/pillar/top.sls
base:
"*": # "*" 表示所有的分组
- xxx # 文件名 # /srv/pillar/xxx.sls
x1:
{% if grains['os_family'] == 'Debian' %}
xxx1: 111111111111111
{% elif grains['os_family'] == 'RedHat' %}
xxx1: 222222222222222
{% elif grains['os'] == 'Arch' %}
xxx1: 333333333333333
{% endif %}

2/3: 是否可以用python脚本实现

# /etc/salt/master
ext_pillar:
- xiaohua:
api: 123
- tom: # /var/cache/salt/master/extmods/pillar/tom.py # [**推荐使用**]
def ext_pillar(minion_id,pillar,*args,**kwargs):
import time
return {'alexcccccccccccccctime':str(time.time())} # /usr/lib/python2.7/site-packages/salt/pillar/wupeiqi.py
def ext_pillar(minion_id,pillar,*args,**kwargs):
import time
return {'alexcccccccccccccctime':str(time.time())}

总结pillar源码分析:

salt/script.py
client = salt.cli.ssh.SaltSSH()
client.run() salt/cli/ssh.py
# self.config是读取的配置文件
ssh = salt.client.ssh.SSH(self.config)
ssh.run() salt/client/ssh/__init__.py
class SSH(object):
def run(self, jid=None):
if self.opts.get('raw_shell', False):
fun = 'ssh._raw'
args = argv
else:
fun = argv[0] if argv else ''
args = argv[1:]
for ret in self.handle_ssh():
pass def handle_ssh():
routine = MultiprocessingProcess(target=self.handle_routine,args=args)
routine.start()
def handle_routine(self, que, opts, host, target, mine=False):
single = Single(...)
single.run() salt/client/ssh/__init__.py
class Single(object):
def run(self, deploy_attempted=False):
stdout, retcode = self.run_wfunc()
return stdout, stderr, retcode
def run_wfunc(self): # 实例化Pillar对象
pillar = salt.pillar.Pillar(
opts_pkg,
opts_pkg['grains'],
opts_pkg['id'],
opts_pkg.get('environment', 'base')
)
pillar_dirs = {} # pillar对象.pillar => 去三个地方获取所有pillar
pillar_data = pillar.compile_pillar(pillar_dirs=pillar_dirs) print(pillar_data) salt/pillar/__init__.py
class Pillar(object): def __init__(...):
# 去中找自定义pillar
# /var/cache/salt/master/extmods/pillar/alex.py # [**推荐使用**]
# /usr/lib/python2.7/site-packages/salt/pillar/wupeiqi.py # ['xiaohua','tom','cmd_json',.....]
self.ext_pillars = salt.loader.pillars(ext_pillar_opts, self.functions) def compile_pillar(self, ext=True, pillar_dirs=None): # 1. top.sls
# 去中找自定义pillar
# 2. /var/cache/salt/master/extmods/pillar/alex.py # [**推荐使用**]
# 3. /usr/lib/python2.7/site-packages/salt/pillar/wupeiqi.py pillar1 = self.render_pillar('top.cls')
pillar2 = self.ext_pillar(pillar1,...) return pillar1 + pillar2 def self.ext_pillar(...):
return self._external_pillar_data(....) def _external_pillar_data(self, pillar, val, pillar_dirs, key):
ext = self.ext_pillars[key](self.minion_id,pillar,*val)
return ext
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