In the process of installing nagiosxi, you are prompted that the installation could not be successful. You are prompted to check systemctl status httpd.service. Httpd failed to start. It should be a problem with httpd. Check/etc/httpd/logs/error.log as follows

[Tue Feb 27 09:30:57.417008 2018] [core:notice] [pid 27244] SELinux policy enabled; httpd running as context system_u:system_r:httpd_t:s0
[Tue Feb 27 09:30:57.417655 2018] [suexec:notice] [pid 27244] AH01232: suEXEC mechanism enabled (wrapper: /usr/sbin/suexec)
[Tue Feb 27 09:30:57.417663 2018] [core:emerg] [pid 27244] (28)No space left on device: AH00023: Couldn't create the proxy mutex
[Tue Feb 27 09:30:57.417667 2018] [proxy:crit] [pid 27244] (28)No space left on device: AH02478: failed to create proxy mutex
AH00016: Configuration Failed

The first problem is the configuration of SELinux. Shut down SELinux to test again, or can’t install it.
/usr/SBIN/setenforce 0 shut down SELinux immediately
/usr/SBIN/setenforce 1 enable SELinux immediately

look at the second problem, baidu found an article, the original connection

solution:
1, input: IPCs – s to see if there are more than 5, If yes, please execute the following 2 commands:
found a lot of ZABBIX information, because ZABBIX was installed before

2, IPCs – s | Perl – ane ‘/ ^ 0x00000000/& amp& amp; ` Ipcrm – S $f [1] ‘
3. Restart Apache service（ This problem is solved!)
ipcs -s | grep apache | perl -e ‘while (< STDIN>) { @ a=split(/\s+/); Print ` ipcrm SEM $a [1] ‘}’

continue to install nagiosxi successfully