将Puppet部署到生产中第一个要编写的模块就是puppet本身，虽然puppet可以运行其它所有模块完成各自的部署，但是puppet一旦出问题，那么一切都会停止工作。当然除了puppet自身模块外，还需要保证网络的通畅以及其它你附加的环境等等。
之前编写过简单的motd模块，大致了解了一些模块的结构以及简单的pp语法，接下来我们进行详细的讲解。那么编写一个完整的puppet模块应该考虑哪些因素呢？
puppet及附属依赖包是否已经安装OK？
puppet配置文件是否正确？
puppet服务是否正常运行？
在更新puppet配置文件的情况下，是否能够主动让puppet服务重启或者reload？
puppet安装包是否能够自动升级到指定版本？
接下来以agent1和agent3为例进行讲解
[root@puppetmaster ~]# cd /etc/puppet/modules/
[root@puppetmaster modules]# mkdir puppet
[root@puppetmaster modules]# cd puppet/
[root@puppetmaster puppet]# mkdir files manifests templates #创建模块目录结构
[root@puppetmaster puppet]# tree ../puppet
../puppet
├── files #存放下载的文件
├── manifests #存放puppet配置
└── templates #存放配置模板，方便pp文件引用
3 directories, 0 files
[root@puppetmaster puppet]# [root@puppetmaster puppet]# cd manifests/
[root@puppetmaster manifests]# touch init.pp config.pp install.pp service.pp params.pp
[root@puppetmaster manifests]# tree ../
../
├── files
├── manifests
│ ├── config.pp #管理puppet配置
│ ├── init.pp #管理模块所有pp文件配置
│ ├── install.pp #管理puppet安装
│ ├── params.pp #管理模块中变量以及一些判断
│ └── service.pp #管理puppet服务
└── templates
3 directories, 5 files整个过程应该是这样，首先应该安装puppet（install.pp），然后配置puppet（config.pp），最后启动puppet服务（service.pp）
注意： 接下来的过程不是一步到位的，是一个循序渐进的过程，一步步指导直到完成一个比较完整的模块。
3.1、编写安装配置文件install.pp
通过package资源实现，更多有关package的语法及案例请访问http://kisspuppet.com/2013/11/11/package/
需要注意的是：class名称要和创建的模块名保持一致，名称为puppet，由于在整个配置文件中init.pp为起始配置文件，包含的都应该是子配置文件，所有应该写成“class主类名称::class子类名称”，而class子类名称需要和创建的pp文件名保持一致，比如puppet::install，那么创建的子类名称就应该是install.pp
3.1.1、编写不具备判断条件的配置文件
节点安装puppet主要还依赖于facter
[root@puppetmaster manifests]# vim install.pp
class puppet::install{ #一个类包含两个子类
include puppet::puppet_install,puppet::facter_install
}
class puppet::puppet_install{
package { 'puppet':
ensure => installed, #要求处于被安装状态
}
}
class puppet::facter_install{
package { 'facter':
ensure => installed,
}
}也可以用以下两种写法
[root@puppetmaster manifests]# vim install.pp
class puppet::install{ #一个类包含两个资源
package { 'puppet':
ensure => installed,
}
package { 'facter':
ensure => installed,
}
}
[root@puppetmaster manifests]# vim install.pp
class puppet::install{
package { ['puppet','facter']: #采用数组的形式
ensure => installed,
}
}3.1.2、编写具备判断系统版本条件的模块
存在这样一种情况，在我的yum源中有很多puppet版本，而我只希望所有节点只安装我指定的版本，比如2.7.25，那么如何设置呢？其次，还应该考虑一种情况，节点的系统版本可能会不一样，比如有RHEL5、RHEL6等，那么如何让puppet模块自己去判断呢？
通过以下facter进行判断
[root@agent1 ~]# facter | grep operatingsystemmajrelease
operatingsystemmajrelease => 5
[root@agent3 ~]# facter | grep operatingsystemmajrelease
operatingsystemmajrelease => 6应该是以下写法比较合理
[root@puppetmaster manifests]# vim install.pp
class puppet::install{
include puppet::puppet_install,puppet::facter_install
}
class puppet::puppet_install{
package { 'puppet':
ensure => $operatingsystemmajrelease ?{ #判断系统版本
5 => '2.7.25-1.el5',
6 => '2.7.25-1.el6',
}
}
}
class puppet::facter_install{
package { 'facter':
ensure => $operatingsystemmajrelease ?{
5 => '1.7.5-1.el5',
6 => '1.7.5-1.el6',
}
}
}3.1.3 添加子类到init.pp中
[root@puppetmaster manifests]# vim init.pp
class puppet{
include puppet::install
}3.1.4 应用到puppet主配置文件site.pp中的节点上
[root@puppetmaster ~]# vim /etc/puppet/manifests/site.pp
$puppetmaster = 'puppetmaster.kisspuppet.com'
node 'puppetmaster_cert.kisspuppet.com'{
include motd,puppet
}
node 'agent1_cert.kisspuppet.com'{
include motd,puppet
}
node 'agent2_cert.kisspuppet.com'{
include motd,puppet
}
node 'agent3_cert.kisspuppet.com'{
include motd,puppet
}也可以是以下写法
[root@puppetmaster ~]# vim /etc/puppet/manifests/site.pp
$puppetmaster = 'puppetmaster.kisspuppet.com'
class environments{
include motd,puppet
}
node 'puppetmaster_cert.kisspuppet.com'{
include environments
}
node 'agent1_cert.kisspuppet.com'{
include environments
}
node 'agent2_cert.kisspuppet.com'{
include environments
}
node 'agent3_cert.kisspuppet.com'{
include environments
}如何所有节点都使用相同的模块，也可以是以下写法
[root@puppetmaster ~]# vim /etc/puppet/manifests/site.pp
$puppetmaster = 'puppetmaster.kisspuppet.com'
class environments{
include motd,puppet
}
node default{
include environments
}3.1.5、进行简单的测试
降低facter版本为1.7.3
[root@agent1 ~]# rpm -e facter --nodeps
[root@agent1 ~]# rpm -ivh facter-1.7.3-1.el5.x86_64.rpm
warning: facter-1.7.3-1.el5.x86_64.rpm: Header V3 RSA/SHA1 signature: NOKEY, key ID 4bd6ec30
Preparing... ########################################### [100%]
1:facter ########################################### [100%]
[root@agent1 ~]# facter --version
1.7.3通过--noop进行尝试性测试，可以看到节点变化情况，但是不进行更改，这也是puppet强大的地方之一
[root@agent1 ~]# puppet agent -t --noop
info: Caching catalog for agent1_cert.kisspuppet.com
info: Applying configuration version '1394794815'
notice: /Stage[main]/Puppet::Facter_install/Package[facter]/ensure: current_value 1.7.3-1.el5, should be 1.7.5-1.el5 (noop)
notice: Class[Puppet::Facter_install]: Would have triggered 'refresh' from 1 events
notice: Stage[main]: Would have triggered 'refresh' from 1 events
notice: Finished catalog run in 0.23 seconds
[root@agent1 ~]# facter --version
1.7.3强制执行，可以看到管理端的facter版本变成了puppet模块中指定的版本1.7.5，这其实也说明了rpm包升级的方法！
[root@agent1 ~]# puppet agent -t
info: Caching catalog for agent1_cert.kisspuppet.com
info: Applying configuration version '1394794815'
notice: /Stage[main]/Puppet::Facter_install/Package[facter]/ensure: ensure changed '1.7.3-1.el5' to '1.7.5-1.el5'
notice: Finished catalog run in 6.27 seconds
[root@agent1 ~]# facter --version
1.7.5整个过程是这样，节点同步puppetmaster端后发现facter版本号不对，根据系统类型马上调用底层的安装工具yum（其它系统如suse会调用zypper等）进行安装，整个过程是透明的，而这正是puppet所呈现的强大功能之二。
3.2、编写配置文件config.pp
通过file资源实现，更多有关file资源的配置及案例请访问http://kisspuppet.com/2013/11/14/file/
3.2.1、我们暂时只配置puppet.conf文件
[root@puppetmaster manifests]# vim config.pp
class puppet::config{
file { '/etc/puppet/puppet.conf': #节点文件存放的路径
ensure => present, #要求存在
content => template('puppet/puppet.conf.erb'), #要求根据模板生成,路径写法为相对路径（templates目录隐藏掉）
owner => 'root', #要求文件属主为root
group => 'root', #要求文件属组为root
mode => '0644', #要求文件权限为644
require => Class['puppet::install'], #要求这个文件在配置之前先正确运行install.pp文件，也就是说要求puppet的包应当处于安装状态
}
}3.2.2、编写puppet.conf.erb模板
puppet的erb模板的存在是为了解决每个节点单独配置一个文件的问题，因为erb模板可以引用fact变量，变量的内容会根据节点系统的不同而变化。
以下为其中一个节点目前的puppet.conf配置文件，我们先找出会变化的内容
[root@agent1 ~]# vim /etc/puppet/puppet.conf
[main]
logdir = /var/log/puppet
rundir = /var/run/puppet
ssldir = $vardir/ssl
[agent]
classfile = $vardir/classes.txt
localconfig = $vardir/localconfig
server = puppetmaster.kisspuppet.com #变量
certname = agent1_cert.kisspuppet.com #变量
runinterval = 10接下来解决这两个变量
之前我们说过创建params.pp就是为了解决变量问题，我们先用这个解决
找出fact值具有唯一性的fact，比如hostname
[root@agent1 ~]# facter |grep hostname
hostname => agent1
[root@agent3 ~]# facter |grep hostname
hostname => agent3编写params.pp文件，增加certname变量
[root@puppetmaster manifests]# vim params.pp
class puppet::params {
$puppetserver = 'puppetmaster.kisspuppet.com' #增加puppetserver变量指向puppetmaster名称
case $hostname{ #增加certname变量
agent1: {
$certname = 'agent1_cert.kisspuppet.com'
}
agent3: {
$certname = 'agent3_cert.kisspuppet.com'
}
default: { #设置默认不存在的情况下报错
fail("certname is not supported on ${::operatingsystem}")
}
}
}注意：这种创建变量的方法在大量节点的情况下显然不是最好的方法，能否通过fact变量实现呢，答案是可以的，可写成以下方式
[root@puppetmaster manifests]# vim params.pp
class puppet::params {
$puppetserver = 'puppetmaster.kisspuppet.com'
$certname = "${::hostname}_cert.kisspuppet.com" #通过fact：hostname实现
case $operatingsystemmajrelease{
5: {
$puppet_release = '2.7.23-1.el5'
$facter_release = '1.7.3-1.el5'
}
6: {
$puppet_release = '2.7.23-1.el6'
$facter_release = '1.7.3-1.el6'
}
default: {
fail("Module puppet is not supported on ${::operatingsystem}")
}
}
}备注：这里使用的是默认的fact，如果要通过系统没有的fact应当如何实现呢,后面《Puppet扩展篇1-自定义fact结合ENC(hirea)的应用实践》会有介绍
思考：通过变量，尤其是hostname变量确定certname只能保证在hostname不变的情况下才能保证certname不变，否则节点任意修改hostname就会造成certname变更，前期的认证失效，又需要重新认证。那么有没有什么办法解决在hostname变化的情况下certname不变呢，也就是说不需要再次申请证书呢？ 后面《Puppet扩展篇1-自定义fact结合ENC(hirea)的应用实践》会有介绍。
在模板中引用certname变量注意模板存放的位置要和config.pp中引用模板的位置保持一致
[root@puppetmaster manifests]# vim ../templates/puppet.conf.erb
### config by puppet ###
[main]
logdir = /var/log/puppet
rundir = /var/run/puppet
ssldir = $vardir/ssl
[agent]
classfile = $vardir/classes.txt
localconfig = $vardir/localconfig
server = <%= scope.lookupvar('puppet::params::puppetserver') %> #引用变量puppetserver
certname = <%= scope.lookupvar('puppet::params::certname') %> #引用变量certname
runinterval = 10由于config.pp依赖于params.pp中的变量，所以config.pp中应当应用class puppet::params
3.3.3 确定依赖关系
[root@puppetmaster manifests]# vim config.pp
class puppet::config{
include puppet::params #添加引用关系
file { '/etc/puppet/puppet.conf':
ensure => present,
content => template('puppet/puppet.conf.erb'),
owner => 'root',
group => 'root',
mode => '0644',
require => Class['puppet::install'],
}
}init.pp中应当包含class puppet::config
[root@puppetmaster manifests]# vim init.pp
class puppet{
include puppet::install,puppet::config
}3.3.4 更新测试
先进行noop测试
[root@agent1 ~]# puppet agent -t --noop
info: Caching catalog for agent1_cert.kisspuppet.com
info: Applying configuration version '1394797763'
notice: /Stage[main]/Puppet::Config/File[/etc/puppet/puppet.conf]/content:
--- /etc/puppet/puppet.conf 2014-03-10 08:22:33.000000000 +0800
+++ /tmp/puppet-file20140314-7231-f50ehp-0 2014-03-14 19:49:24.000000000 +0800
@@ -1,3 +1,4 @@
+### config by puppet ### #添加部分
[main]
logdir = /var/log/puppet
rundir = /var/run/puppet
notice: /Stage[main]/Puppet::Config/File[/etc/puppet/puppet.conf]/content: current_value {md5}fb17740fd53d8d4dfd6d291788a9bda3, should be {md5}134bae34adddbf30a3fe02ff0eb3c6a6 (noop)
notice: Class[Puppet::Config]: Would have triggered 'refresh' from 1 events
notice: Stage[main]: Would have triggered 'refresh' from 1 events
notice: Finished catalog run in 0.43 seconds强制执行更新
[root@agent1 ~]# puppet agent -t
info: Caching catalog for agent1_cert.kisspuppet.com
info: Applying configuration version '1394797763'
notice: /Stage[main]/Puppet::Config/File[/etc/puppet/puppet.conf]/content:
--- /etc/puppet/puppet.conf 2014-03-10 08:22:33.000000000 +0800
+++ /tmp/puppet-file20140314-7475-mlybgg-0 2014-03-14 19:50:16.000000000 +0800
@@ -1,3 +1,4 @@
+### config by puppet ###
[main]
logdir = /var/log/puppet
rundir = /var/run/puppet
info: FileBucket adding {md5}fb17740fd53d8d4dfd6d291788a9bda3
info: /Stage[main]/Puppet::Config/File[/etc/puppet/puppet.conf]: Filebucketed /etc/puppet/puppet.conf to puppet with sum fb17740fd53d8d4dfd6d291788a9bda3
notice: /Stage[main]/Puppet::Config/File[/etc/puppet/puppet.conf]/content: content changed '{md5}fb17740fd53d8d4dfd6d291788a9bda3' to '{md5}134bae34adddbf30a3fe02ff0eb3c6a6'
notice: Finished catalog run in 0.34 seconds
[root@agent1 ~]# cat /etc/puppet/puppet.conf
### config by puppet ###
[main]
logdir = /var/log/puppet
rundir = /var/run/puppet
ssldir = $vardir/ssl
[agent]
classfile = $vardir/classes.txt
localconfig = $vardir/localconfig
server = puppetmaster.kisspuppet.com #根据预先定的puppetserver变量生成
certname = agent1_cert.kisspuppet.com #根据预先定义的certname变量生成
runinterval = 10
[root@agent3 ~]# puppet agent -t
info: Caching certificate for agent3_cert.kisspuppet.com
info: Caching certificate_revocation_list for ca
info: Caching catalog for agent3_cert.kisspuppet.com
info: Applying configuration version '1394797763'
notice: /Stage[main]/Motd/File[/etc/motd]/content:
--- /etc/motd 2010-01-12 21:28:22.000000000 +0800
+++ /tmp/puppet-file20140314-2786-1wb4mas-0 2014-03-14 19:51:27.589533699 +0800
@@ -0,0 +1,3 @@
+-- --
+--------puppet test---------
+-- --
info: FileBucket adding {md5}d41d8cd98f00b204e9800998ecf8427e
info: /Stage[main]/Motd/File[/etc/motd]: Filebucketed /etc/motd to puppet with sum d41d8cd98f00b204e9800998ecf8427e
notice: /Stage[main]/Motd/File[/etc/motd]/content: content changed '{md5}d41d8cd98f00b204e9800998ecf8427e' to '{md5}87ea3a1af8650395038472457cc7f2b1'
notice: /Stage[main]/Puppet::Config/File[/etc/puppet/puppet.conf]/content:
--- /etc/puppet/puppet.conf 2014-03-09 01:50:46.112175841 +0800
+++ /tmp/puppet-file20140314-2786-z4e844-0 2014-03-14 19:51:27.719533700 +0800
@@ -1,3 +1,4 @@
+### config by puppet ###
[main]
logdir = /var/log/puppet
rundir = /var/run/puppet
@@ -8,3 +9,5 @@
localconfig = $vardir/localconfig
server = puppetmaster.kisspuppet.com
certname = agent3_cert.kisspuppet.com
+ runinterval = 10
+
+
+
+
+ = true
info: FileBucket adding {md5}03cbe6d4def560996eeacedfaef229b4
info: /Stage[main]/Puppet::Config/File[/etc/puppet/puppet.conf]: Filebucketed /etc/puppet/puppet.conf to puppet with sum 03cbe6d4def560996eeacedfaef229b4
notice: /Stage[main]/Puppet::Config/File[/etc/puppet/puppet.conf]/content: content changed '{md5}03cbe6d4def560996eeacedfaef229b4' to '{md5}4f57479998961563e3306b5d0e02a678'
info: Creating state file /var/lib/puppet/state/state.yaml
notice: Finished catalog run in 2.86 seconds
[root@agent3 ~]# cat /etc/puppet/puppet.conf
### config by puppet ###
[main]
logdir = /var/log/puppet
rundir = /var/run/puppet
ssldir = $vardir/ssl
[agent]
classfile = $vardir/classes.txt
localconfig = $vardir/localconfig
server = puppetmaster.kisspuppet.com
certname = agent3_cert.kisspuppet.com
runinterval = 103.3、编写配置文件service.pp
通过service资源实现，更多有关service资源及案例请访问http://kisspuppet.com/2013/11/12/service/
3.3.1、编写service.pp文件
[root@puppetmaster manifests]# vim service.pp
class puppet::service{
service { 'puppet':
ensure => running, #设置puppet服务一直处于运行状态
hasstatus => true, #通过标准的命令“service server_name status"进行检查状态
hasrestart => true, #设置puppet服务具有标准的restart命令
enable => true, #要求开机自动启动，其实通过chkconfig设置puppet状态为on
}
}3.3.2、更新config.pp文件，增加通知服务重启功能
这个设置完成后，我们再想想我们预先确定的要求是配置在更新后要求puppet服务自动重启，应当做如下设置
[root@puppetmaster manifests]# vim config.pp
class puppet::config{
include puppet::params
file { '/etc/puppet/puppet.conf':
ensure => present,
content => template('puppet/puppet.conf.erb'),
owner => 'root',
group => 'root',
mode => '0644',
require => Class['puppet::install'],
notify => Class['puppet::service'], #配置更新后主动通过puppet服务重启
}
}3.3.3、添加class puppet::service到init.pp中
[root@puppetmaster manifests]# vim init.pp
class puppet{
include puppet::install,puppet::config,puppet::service
}3.3.4、测试
测试一：查看是否设置了开机启动，查看puppet服务状态
[root@agent1 ~]# chkconfig puppet off
[root@agent1 ~]# /etc/init.d/puppet status
puppetd is stopped
[root@agent1 ~]# puppet agent -t
info: Caching catalog for agent1_cert.kisspuppet.com
info: Applying configuration version '1394798692'
notice: /Stage[main]/Puppet::Service/Service[puppet]/ensure: ensure changed 'stopped' to 'running'
notice: Finished catalog run in 1.42 seconds
[root@agent1 ~]# chkconfig --list | grep puppet
puppet 0:off 1:off 2:on 3:on 4:on 5:on 6:off
[root@agent1 ~]# /etc/init.d/puppet status
puppetd (pid 8537) is running...测试二、查看配置被更改还原后，服务是否会自动重启
[root@agent1 ~]# echo "#add a line" >>/etc/puppet/puppet.conf
[root@agent1 ~]# tailf /var/log/messages
Mar 14 21:18:52 agent1 puppet-agent[10803]: Reopening log files
Mar 14 21:18:52 agent1 puppet-agent[10803]: Starting Puppet client version 2.7.25
Mar 14 21:18:53 agent1 puppet-agent[10803]: Finished catalog run in 0.27 seconds
Mar 14 21:19:05 agent1 puppet-agent[10803]: Finished catalog run in 0.35 seconds
Mar 14 21:19:16 agent1 puppet-agent[10803]: Finished catalog run in 0.71 seconds
Mar 14 21:19:27 agent1 puppet-agent[10803]: Finished catalog run in 0.30 seconds
Mar 14 21:19:38 agent1 puppet-agent[10803]: Finished catalog run in 0.37 seconds
Mar 14 21:19:50 agent1 puppet-agent[10803]: Finished catalog run in 0.42 seconds
Mar 14 21:20:01 agent1 puppet-agent[10803]: Finished catalog run in 0.28 seconds
Mar 14 21:20:12 agent1 puppet-agent[10803]: Finished catalog run in 0.36 seconds
Mar 14 21:20:23 agent1 puppet-agent[10803]: Finished catalog run in 0.27 seconds
Mar 14 21:20:34 agent1 puppet-agent[10803]: (/Stage[main]/Puppet::Config/File[/etc/puppet/puppet.conf]/content) content changed '{md5}898865b650b9af4cae1886a894ce656e' to '{md5}8c67cb8c039bb6436556b91f0c6678c4'
Mar 14 21:20:34 agent1 puppet-agent[10803]: Caught TERM; calling stop
Mar 14 21:20:36 agent1 puppet-agent[13068]: Reopening log files
Mar 14 21:20:36 agent1 puppet-agent[13068]: Starting Puppet client version 2.7.25 #重启服务3.3.5、服务设置reload动作
在有些场合，我们仅仅需要在修改配置后，让服务重新reload而不是restart，这又当如何设置呢
[root@puppetmaster manifests]# vim config.pp
class puppet::service{
service { 'puppet':
ensure => running,
hasstatus => true,
hasrestart => true,
enable => true,
provider => init,
path => "/etc/init.d", #设置启动脚本的搜索路径
restart => "/etc/init.d/sshd reload", #将restart改成reload
start => "/etc/init.d/sshd start",
stop => "/etc/init.d/sshd stop",
}
}测试可以看出服务并没有停止，而是refresh了
[root@agent1 ~]# echo "#add a line" >>/etc/puppet/puppet.conf
[root@agent1 ~]# tailf /var/log/messages
Mar 14 21:32:03 agent1 puppet-agent[13068]: Finished catalog run in 0.33 seconds
Mar 14 21:32:13 agent1 puppet-agent[13068]: Reparsing /etc/puppet/puppet.conf
Mar 14 21:32:14 agent1 puppet-agent[13068]: (/Stage[main]/Puppet::Config/File[/etc/puppet/puppet.conf]/content) content changed '{md5}898865b650b9af4cae1886a894ce656e' to '{md5}8c67cb8c039bb6436556b91f0c6678c4'
Mar 14 21:32:14 agent1 puppet-agent[13068]: (/Service[puppet]) Triggered 'refresh' from 1 events
Mar 14 21:32:14 agent1 puppet-agent[13068]: Finished catalog run in 0.32 seconds
Mar 14 21:32:25 agent1 puppet-agent[13068]: Finished catalog run in 0.25 seconds
Mar 14 21:32:35 agent1 puppet-agent[13068]: Reparsing /etc/puppet/puppet.conf
Mar 14 21:32:36 agent1 puppet-agent[13068]: Finished catalog run in 0.25 seconds4、优化代码
4.1、 将install.pp中的判断语句添加到params.pp中
[root@puppetmaster manifests]# vim params.pp
class puppet::params {
$puppetserver = 'puppetmaster.kisspuppet.com'
case $hostname{
agent1: {
$certname = 'agent1_cert.kisspuppet.com'
}
agent3: {
$certname = 'agent3_cert.kisspuppet.com'
}
default: {
fail("certname is not supported on ${::operatingsystem}")
}
}
case $operatingsystemmajrelease{ #添加系统版本变量
5: {
$puppet_release = '2.7.23-1.el5'
$facter_release = '1.7.3-1.el5'
}
6: {
$puppet_release = '2.7.23-1.el6'
$facter_release = '1.7.3-1.el6'
}
default: {
fail("Module puppet is not supported on ${::operatingsystem}")
}
}
}
[root@puppetmaster manifests]# vim install.pp #通过变量引用
class puppet::install{
include puppet::puppet_install,puppet::facter_install
}
class puppet::puppet_install{
package { 'puppet':
ensure => $puppet::params::puppet_release, #puppet里引用变量的方法为“$class::子class::变量”
}
}
class puppet::facter_install{
package { 'facter':
ensure => $puppet::params::facter_release,
}
}4.2、测试（略）
技术源于分享.....
ssh模块案例详解：http://dreamfire.blog.51cto.com/418026/1257719