torlee 发表于 2018-8-2 13:49:00

Puppet根据节点机器名推送并自动执行SHELL脚本

  puppet的基础环境介绍:
  puppet服务器和客户端都已下载了epel的外部yum源,都已通过yum程序自动安装了puppet程序,过程比较简单,这里就不一一介绍了,机器都放置在同一局域网内,cn7788.com的域名,内部有内网DNS环境,没有用LDP作为域控,局域网还有其它客户端,由于不需要使用puppet环境,所以就不一一介绍了。
server.cn7788.com 192.168.1.124puppet-master  
client.cn7788.com 192.168.1.125puppet-client
  
lamp.cn7788.com 192.168.1.126puppet-client
  
xen.cn7788.com192.168.1.144 puppet-client
  大家可以将上面的域名对应关系可将其都写在各自机器的/etc/hosts文件里,在各个puppet客户端上建议ntpdate精准对时(因为puppet的证书对时间要求严格),不然puppet-client连接时会报如下错误:
warning: peer certificate won't be verified in thisSSL session  
info: Caching certificate for client.cn7788.com
  
info: Caching certificate_revocation_list for ca
  
err: Could not retrieve catalog from remote server:certificate verify failed.This is oftenbecause the time is out of sync on the server or client
  
warning: Not using cache on failed catalog
  
err: Could not retrieve catalog; skipping run
  
err: Could not send report: certificate verifyfailed.This is often because the timeis out of sync on the server or client
  需求如下:客户机机器xen.cn7788.com和lamp.cn7788.com没有安装nagios客户端程序,这时想过通过puppet-server推送SHELL脚本自动安装,其它的客户端暂时没这么需求,这个应该如何实现呢?
  由于客户端节点机器比较多,所以这里需要用到节点和模块的概念,这里我们先建立名为nagioscli的模块,如下所示:
mkdir -p/etc/puppet/modules/nagioscli/{manifests,files,templates}  files目录下的nagioscli.sh文件内容如下所示:
#!/bin/bash  
useradd nagios
  
cd /usr/local/src
  
wget wget http://syslab.comsenz.com/downloads/linux/nagios-plugins-1.4.13.tar.gz
  
wget http://syslab.comsenz.com/downloads/linux/nrpe-2.12.tar.gz
  
tar zxvf nagios-plugins-1.4.13.tar.gz
  
cd nagios-plugins-1.4.13
  
./configure
  
make
  
make install
  
chown nagios:nagios /usr/local/nagios
  
chown -R nagios:nagios /usr/local/nagios/libexec
  
cd ../
  
tar zxvf nrpe-2.12.tar.gz
  
cd nrpe-2.12
  
./configure
  
make all
  
make install-plugin
  
make install-daemon
  
make install-daemon-config
  
sed -i's@allowed_hosts=127.0.0.1@allowed_hosts=114.112.11.11@'/usr/local/nagios/etc/nrpe.cfg
  
#114.112.11.11为nagios服务器的IP地址,这个可以根据实际需求更改。
  
/usr/local/nagios/bin/nrpe -c/usr/local/nagios/etc/nrpe.cfg -d
  
echo "/usr/local/nagios/bin/nrpe -c/usr/local/nagios/etc/nrpe.cfg -d" >> /etc/rc.local
  site.pp文件内容如下:
import "node.pp"  这里扩展了site.pp文件内容,它会载入node.pp文件,这样puppet-master在启动的时候,就会自动截入并处理node.pp文件了。
  node.pp文件内容如下所示:
node 'lamp.cn7788.com'{  
file
  
{"/usr/local/src/nagioscli.sh":
  
source =>"puppet://server.cn7788.com/modules/nagioscli/nagioscli.sh",
  
group => root,
  
owner => root,
  
mode=> 755,
  
}
  
exec {
  
"auto install naigios client":
  
command =>"sh /usr/local/src/nagioscli.sh",
  
user =>"root",
  
path =>["/usr/bin","/usr/sbin","/bin","/bin/sh"],
  
}
  
}
  
node 'xen.cn7788.com'{
  
file
  
{"/usr/local/src/nagioscli.sh":
  
source =>"puppet://server.cn7788.com/modules/nagioscli/nagioscli.sh ",
  
group => root,
  
owner => root,
  
mode=>644,
  
}
  
exec {
  
"auto install naigios client":
  
command =>"sh /usr/local/src/nagioscli.sh",
  
user =>"root",
  
path =>["/usr/bin","/usr/sbin","/bin","/bin/sh"],
  
}
  
}
  
node 'client.cn7788.com'{
  

  client.cn7788.com节点机器后面什么都没有,则表示没有任何操作在此节点机器上面,因为client机器也在puppet环境里,并配置成了自动连接,配置成如此,是防止自动连接时puppet频繁报错。
  这里以xen.cn7788.com为例,在其主机上输入如下命令:
puppetd --test --server server.cn7788.com  xen.cn7788.com上命令显示结果如下所示:
info: Caching catalog for xen.cn7788.com  
info: Applying configuration version '1382622383'
  
--- /usr/local/src/nagioscli.sh       2013-10-24 22:35:36.000000000 +0800
  
+++ /tmp/puppet-file.22857.0   2013-10-24 22:39:08.000000000 +0800
  
@@ -1,4 +1,5 @@
  #!/bin/bash
  
+yum -y install httpd gcc gcc-c++ glibcglibc-common gd gd-devel
  useraddnagios
  cd/usr/local/src
  wgetwget http://syslab.comsenz.com/downloads/linux/nagios-plugins-1.4.13.tar.gz
  
info: FileBucket adding{md5}f75e9aa3fc301c8e9c85f2677feaa9b5
  
info:/Stage//Node/File:Filebucketed /usr/local/src/nagioscli.sh to puppet with sumf75e9aa3fc301c8e9c85f2677feaa9b5
  
notice:/Stage//Node/File/content: contentchanged '{md5}f75e9aa3fc301c8e9c85f2677feaa9b5' to'{md5}a1ed4dc2b98450e3144530f32677f736'
  
notice:/Stage//Node/Exec/returns:executed successfully
  
notice: Finished catalog run in 283.11 seconds
  执行时间比较长,总共耗时283.11秒,我们要检查下xen.cn7788.com的节点机器上是否开启了nrpe 进程,输入命令如下所示:
ps aux | grep nrpe | grep –v grep  命令显示结果如下所示:
nagios223310.00.15108   924 ?      Ss22:35   0:00/usr/local/nagios/bin/nrpe -c /usr/local/nagios/etc/nrpe.cfg -d  我们检查下/etc/rc.local,看此命令有没有添加进去,命令如下:
grep -v"^#" /etc/rc.local  命令执行结果显示如下所示:
touch /var/lock/subsys/local  
/usr/local/nagios/bin/nrpe -c/usr/local/nagios/etc/nrpe.cfg -d
  检查结果说明puppet-master的nagioscli模块是正常的,lamp.cn7788.com的结果类似,这里就不再贴出检测结果了,我们主要看下lamp.cn7788.com总共耗时多少,命令如下所示:
puppetd --test --serverserver.cn7788.com  结果如下所示:
info: Caching catalog for lamp.cn7788.com  
info: Applying configuration version '1382622383'
  
notice: /Stage//Node/Exec/returns: executed successfully
  
notice: Finished catalog run in 169.08 seconds
  执行时间比较长,总共耗时169.08秒。
  其实工作中像这种推送脚本执行的需求还是很多的,类似在各种不同名字的节点上执行的优化服务器命令、批量清除varnish缓存加速服务器缓存、根据机器名推送文件,我们只需要将此案例稍为变通下即可在工作中投入应用了。
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