python 远程执行代码 fabr

 fabric应用:                1、fab -H 172.23.177.40,172.23.177.41 host_type                2、fab host_type check_ver                3、role： 当client较多时可以定义角色，然后按角色进行操作。                     #!/usr/bin/pyhton                     from fabric.api import *                     env.user = 'root'                     env.password = 'vagrant'                     env.roledefs = {                          'web': ['172.23.177.41','172.23.177.43'],                          'dns': ['172.23.177.46','177.23.177.73']                     }                     def test():                         run('uname -a')                run:                     fab -R web test                result:                     [172.23.177.41] Executing task 'test'                     [172.23.177.41] run: uname -a                     [172.23.177.41] out: Linux salt-master 2.6.32-358.23.2.el6.x86_64 #1 SMP Wed Oct 16 18:37:12 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux                     [172.23.177.41] out:                     [172.23.177.43] Executing task 'test'                     [172.23.177.43] run: uname -a                     [172.23.177.43] out: Linux salt-minion-3 2.6.32-358.23.2.el6.x86_64 #1 SMP Wed Oct 16 18:37:12 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux                     [172.23.177.43] out:                     Done.                     Disconnecting from 172.23.177.43... done.                     Disconnecting from 172.23.177.41... done.                     #从结果可以看到，fab只执行了属于web组的client。                4、extend属性                     from fabric.api import env, run                     env.hosts.extend(['host3', 'host4'])                     def test():                         run('uname -r')                     When this fabfile is run as fab -H host1,host2 mytask, env.hosts will then contain ['host1', 'host2', 'host3', 'host4'] at the time that mytask is executed.                5、fabfile中没有定义client，可以在命令行中指定                     fab mytask:hosts='172.23.177.41;172.23.177.46'                6、使用task方式：                     from fabric.api import hosts, run                     @hosts('172.23.177.41', '172.23.188.46')                     def test():                         run('uname -r')                     或者：                     my_hosts = ('172.23.177.41', '172.23.177.46')                     @hosts(my_hosts)                     def test():                          run('uname -r')                run:                     fab test                resule: 从结果中可以看到，fab只执行了task定义的test部分                     [172.23.177.41] Executing task 'test'                     [172.23.177.41] run: uname -a                     [172.23.177.41] out: Linux salt-master 2.6.32-358.23.2.el6.x86_64 #1 SMP Wed Oct 16 18:37:12 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux                     [172.23.177.41] out:                     [172.23.177.46] Executing task 'test'                     [172.23.177.46] run: uname -a                     [172.23.177.46] out: Linux salt-minion-1 2.6.32-358.23.2.el6.x86_64 #1 SMP Wed Oct 16 18:37:12 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux                     [172.23.177.46] out:                     Done.                     Disconnecting from 172.23.177.41... done.                     Disconnecting from 172.23.177.46... done.                7、综合应用：                     from fabric.api import env, hosts, roles, run                     env.roledefs = {'role1': ['b', 'c']}                     @hosts('a', 'b')                     @roles('role1')                     def test():                         run('uname -r')                8、遇到主机不可达的情况，可以使用--skip-bad-hosts参数，这样就会跳过不存在或有问题的client，而执行其他的client，从返回结果中可以排除那些是有问题的client，进而在进行处理                     fab --skip-bad-hosts test                     node:                     my_hosts = ('172.23.177.41','172.23.177.40','172.23.177.46')                     @hosts(my_hosts)                     def test():                         run('uname -a')