最近想玩一下自动化安装，就研究了一下cobbler，测试环境本来是想用CentOS6.X的，但是后来一想，还是想用CentOS7.X。然后就碰到坑了。
在同步cobbler配置的时候，发现了以下错误：
cobbler sync
dhcpd -t failed
Exception occured: <class ‘cobbler.cexceptions.CX‘>
Exception value: ‘cobbler trigger failed: cobbler.modules.sync_post_restart_services‘
Exception Info:
File "/usr/lib/python2.7/site-packages/cobbler/remote.py", line 82, in run
rc = self._run(self)
File "/usr/lib/python2.7/site-packages/cobbler/remote.py", line 181, in runner
return self.remote.api.sync(self.options.get("verbose",False),logger=self.logger)
File "/usr/lib/python2.7/site-packages/cobbler/api.py", line 763, in sync
return sync.run()
File "/usr/lib/python2.7/site-packages/cobbler/action_sync.py", line 144, in run
utils.run_triggers(self.api, None, "/var/lib/cobbler/triggers/sync/post/*", logger=self.logger)
File "/usr/lib/python2.7/site-packages/cobbler/utils.py", line 928, in run_triggers
raise CX("cobbler trigger failed: %s" % m.__name__)
!!! TASK FAILED !!!
看报错是跟DHCP服务有关系，
查看dhcp的模板：
subnet 192.168.100.0 netmask 255.255.255.0 {
option routers 192.168.100.254;
option domain-name-servers 192.168.100.254;
option subnet-mask 255.255.255.0;
range dynamic-bootp 192.168.1.10 192.168.1.200;
default-lease-time 21600;
max-lease-time 43200;
next-server $next_server;
发现配置有问题，犯这么低级的错误。太狗血了
修改过配置之后，再执行：
发现还是报这个错误。
只好求助Google大神了。
发现竟然是cobbler的Python源码在CentOS7上面有点问题：
cd /usr/lib/python2.7/site-packages/cobbler/modules
cat -n sync_post_restart_services.py
35 dhcp_restart_command = "service %s restart" % dhcp_service_name
发现第35行，重启dhcp的命令还是使用的CentOS6的
拷贝出去，修改代码：
cp sync_post_restart_services.py /tmp/
然后备份老的代码：
mv sync_post_restart_services.py{,.ori}
mv sync_post_restart_services.pyc{,.ori}
mv sync_post_restart_services.pyo{,.ori}
然后对拷贝的文件进行修改：
cd /tmp/
vim sync_post_restart_services.py
把 35 行：dhcp_restart_command = "service %s restart" % dhcp_service_name
修改为：dhcp_restart_command = "/usr/bin/systemctl restart %s " % dhcp_service_name
然后编译Python文件
python -m compileall sync_post_restart_services.py
python -O -m compileall sync_post_restart_services.py
把编译后的文件拷贝回原目录：
cp sync_post_restart_services.py* /usr/lib/python2.7/site-packages/cobbler/modules
最后重启：cobbler
systemctl restart cobbler
引用：https://bugzilla.redhat.com/show_bug.cgi?id=709151
Cobbler安装报错--dhcpd -t failed Exception occured: <class 'cobbler.cexceptions.CX'>
原文地址：https://www.cnblogs.com/guoyishen/p/9210929.html