NRPE:无法读取输出权限问题

Question

我正试着尽可能的清楚:我的大脑会爆炸，就像那些爆炸的小猫一样。

两台机器Centos 7：

[root@192.168.10.2]# cat /proc/version
Linux version 3.10.0-693.11.6.el7.x86_64 (builder@kbuilder.dev.centos.org) (gcc version 4.8.5 20150623 (Red Hat 4.8.5-16) (GCC) ) #1 SMP Thu Jan 4 01:06:37 UTC 2018

以及来自EPEL的最新NRPE：

[root@192.168.10.1]# ./check_nrpe -H 192.168.10.2
NRPE v3.2.0

我正在尝试从nagios服务器重新启动一个服务，这样我就可以设置一个事件处理程序。所有这些都是从大量脚本开始的，但现在我将问题缩小到以下几个方面：

[root@192.168.10.1]# ./check_nrpe -H 192.168.10.2 -c restart
NRPE: Unable to read output

[root@192.168.10.1]# ./check_nrpe -H 192.168.10.2 -c status
(... correct service status output ...)
Loaded: loaded (/usr/lib/systemd/system/cachefilesd.service
(... correct service status output ...)

因此，我可以状态服务，但不能启动或重新启动。

[root@192.168.10.2]# cat /etc/nagios/nrpe.conf:

[...]
nrpe_user=nrpe
nrpe_group=nrpe
allowed_hosts=127.0.0.1,192.168.10.1
command[status]=/lib64/nagios/plugins/status.sh
command[restart]=/lib64/nagios/plugins/restart.sh
[...]


[root@192.168.10.2]# cat /lib64/nagios/plugins/status.sh

#!/bin/bash
sudo systemctl status cachefilesd
exit 0

和

[root@192.168.10.2]# cat /lib64/nagios/plugins/restart.sh

#!/bin/bash
sudo systemctl restart cachefilesd
exit 0

sudoers：

[root@192.168.10.2]# cat /etc/sudoers

# Defaults specification
Defaults: nrpe !requiretty
Defaults: nagios !requiretty

nagios ALL = NOPASSWD: /sbin/service,/usr/bin/systemctl,/usr/sbin/service
nrpe ALL = NOPASSWD: /sbin/service,/usr/bin/systemctl,/usr/sbin/service

如果我输入：

[root@192.168.10.2]# sudo -u nrpe -H ./restart-cachefilesd.sh

一切都很好。

我在NRPE中启用了调试，我得到：

nrpe[5431]: Host address is in allowed_hosts
nrpe[5431]: Host 192.168.10.1 is asking for command 'restart' to be run...
nrpe[5431]: Running command: /lib64/nagios/plugins/restart.sh
nrpe[5432]: WARNING: my_system() seteuid(0): Operation not permitted
nrpe[5431]: Command completed with return code 0 and output:
nrpe[5431]: Return Code: 3, Output: NRPE: Unable to read output
nrpe[5431]: Connection from 192.168.10.1 closed.

我试着strace输出，但是对我来说太多了.

Answer 1

与其将sudo放入脚本中，不如将sudo包含在nrpe.cfg文件中：

command[status]=sudo /lib64/nagios/plugins/status.sh

而不是

command[status]=/lib64/nagios/plugins/status.sh