mcollective插件（shell plugins）功能在Linux系统上无所不能

众所周知，mcollecitve只是一个框架而已，它单独是干不了任何事情的，如果要让他去操作一个平台，是需要插件（plugins）进行操作的，比如通过puppet插件去管理节点puppet的所有命令，通过fact插件去管理fact的所有参数等等，那么如何去管理系统的命令呢，这就需要shell插件。

插件下载地址：https://github.com/kisspuppet/mcollective-plugins，有github客户端的童鞋可直接clonehttps://github.com/kisspuppet/mcollective-plugins.git

更多有关puppet的文章可访问http://kisspuppet.com

1、下载插件放在对应的目录里即可

mcollective-client端

[root@linuxmaster1poc ~]# mco shell "cat /etc/passwd | grep puppet"
Do you really want to send this command unfiltered? (y/n): y
Discovering hosts using the mc method for 2 second(s) .... 3
Host: linux58poc
Statuscode: 0
Output:
puppet:x:52:52:Puppet:/var/lib/puppet:/sbin/nologin
Host: linux64poc
Statuscode: 0
Output:
puppet:x:52:52:Puppet:/var/lib/puppet:/sbin/nologin
Host: linux57poc
Statuscode: 0
Output:
puppet:x:52:52:Puppet:/var/lib/puppet:/sbin/nologin

mcollective-server端

[root@linux57poc agent]# ll /usr/libexec/mcollective/mcollective/agent/ | grep shell
-rw-r--r-- 1 root root 1017 Aug  6 06:36 shell.ddl
-rw-r--r-- 1 root root  862 Aug  6 06:36 shell.rb

备注：mcollective-server端部署完成之后，记得重启mcollective服务。

2、 查看shell插件是否加载成功

从下面可以看出mcollective-client端shell插件已经有了[root@linuxmaster1poc ~]# mco The Marionette Collective version 2.2.4

usage: /usr/bin/mco command <options>
Known commands:
   completion           facts                find              
   help                 inventory            ping              
   plugin               puppet               rpc               
   shell   #shell插件加载OK                                                    
Type '/usr/bin/mco help' for a detailed list of commands and '/usr/bin/mco help command'
to get detailed help for a command

从下面可以看出mcollective-server端shell插件也加载了

[root@linuxmaster1poc ~]# mco inventory linux57poc
Inventory for linux57poc:
   Server Statistics:
                      Version: 2.2.4
                   Start Time: Fri Dec 13 01:14:14 +0800 2013
                  Config File: /etc/mcollective/server.cfg
                  Collectives: mcollective
              Main Collective: mcollective
                   Process ID: 23898
               Total Messages: 10
      Messages Passed Filters: 10
            Messages Filtered: 0
             Expired Messages: 0
                 Replies Sent: 9
         Total Processor Time: 0.73 seconds
                  System Time: 0.17 seconds
   Agents:
      discovery       puppet          rpcutil      
      shell  #shell插件加载OK                                        
   Data Plugins:
      agent           fstat           puppet       
      resource                                     
   Configuration Management Classes:
      No classes applied
   Facts:
      architecture => x86_64
      augeasversion => 0.10.0
      bios_release_date => 06/22/2012
      bios_vendor => Phoenix Technologies LTD
      bios_version => 6.00
      blockdevice_fd0_size => 4096
      blockdevice_hdc_size => 3834736640
      blockdevice_sda_model => Virtual disk
      blockdevice_sda_size => 42949672960
    。。。

3、通过shell插件执行shell命令

mco shell帮助信息

[root@linuxmaster1poc ~]# mco shell --help
MCollective Distributed Shell
Usage:   mco shell <CMD>
  The CMD is a string
  EXAMPLES:
    mco shell uptime
        --np, --no-progress          Do not show the progress bar
    -1, --one                        Send request to only one discovered nodes
        --batch SIZE                 Do requests in batches
        --batch-sleep SECONDS        Sleep time between batches
        --limit-seed NUMBER          Seed value for deterministic random batching
        --limit-nodes, --ln, --limit COUNT
                                     Send request to only a subset of nodes, can be a percentage
    -j, --json                       Produce JSON output
        --display MODE               Influence how results are displayed. One of ok, all or failed
    -c, --config FILE                Load configuratuion from file rather than default
    -v, --verbose                    Be verbose
    -h, --help                       Display this screen
Common Options
    -T, --target COLLECTIVE          Target messages to a specific sub collective
        --dt, --discovery-timeout SECONDS
                                     Timeout for doing discovery
    -t, --timeout SECONDS            Timeout for calling remote agents
    -q, --quiet                      Do not be verbose
        --ttl TTL                    Set the message validity period
        --reply-to TARGET            Set a custom target for replies
        --dm, --disc-method METHOD   Which discovery method to use
        --do, --disc-option OPTION   Options to pass to the discovery method
        --nodes FILE                 List of nodes to address
Host Filters
    -W, --with FILTER                Combined classes and facts filter
    -S, --select FILTER              Compound filter combining facts and classes
    -F, --wf, --with-fact fact=val   Match hosts with a certain fact
    -C, --wc, --with-class CLASS     Match hosts with a certain config management class
    -A, --wa, --with-agent AGENT     Match hosts with a certain agent
    -I, --wi, --with-identity IDENT  Match hosts with a certain configured identity
The Marionette Collective 2.2.4

显示对端uptime命令负载情况

[root@linuxmaster1poc ~]# mco shell "uptime"
Do you really want to send this command unfiltered? (y/n): y
Discovering hosts using the mc method for 2 second(s) .... 3
Host: linux58poc
Statuscode: 0
Output:
 02:45:02 up 21:10,  2 users,  load average: 0.00, 0.00, 0.00
Host: linux64poc
Statuscode: 0
Output:
 02:45:02 up 20:59,  1 user,  load average: 0.00, 0.00, 0.00
Host: linux57poc
Statuscode: 0
Output:
 02:45:02 up 21:04,  3 users,  load average: 0.00, 0.00, 0.00

显示所有节点/etc/password文件中puppet用户哪一行

[root@linuxmaster1poc ~]# mco shell "cat /etc/passwd | grep puppet"
Do you really want to send this command unfiltered? (y/n): y
Discovering hosts using the mc method for 2 second(s) .... 3
Host: linux58poc
Statuscode: 0
Output:
puppet:x:52:52:Puppet:/var/lib/puppet:/sbin/nologin
Host: linux64poc
Statuscode: 0
Output:
puppet:x:52:52:Puppet:/var/lib/puppet:/sbin/nologin
Host: linux57poc
Statuscode: 0
Output:
puppet:x:52:52:Puppet:/var/lib/puppet:/sbin/nologin

修改其中一台主机的root密码

备注：更多操作步骤可参考mco shell --help帮助。

警告：基于mcollective的shell插件虽然功能很强大，除了动态显示的命令之外，其它root能操作的，它基本上都能操作。所以操作也非常危险，可根据生产环境实际情况而定。