Installing the Nagios Error

Recently installed Nagios, check the status of no problem, that is, the status of the monitoring system is not displayed

The results of the test are as follows:

[root@lb02 ~]# /etc/init.d/httpd start
Starting httpd: 
You have new mail in /var/spool/mail/root
[root@lb02 ~]# 
[root@lb02 ~]# 
[root@lb02 ~]# /etc/init.d/nagios checkconfig
Running configuration check...
Nagios Core 3.5.1 Copyright (c) 2009-2011 Nagios Core Development Team and Community Contributors
Copyright (c) 1999-2009 Ethan Galstad
Last Modified: 08-30-2013 License: GPL

Website: http://www.nagios.org Reading configuration data...
   Read main config file okay...
Processing object config file ‘/usr/local/nagios/etc/objects/commands.cfg‘...
Processing object config file ‘/usr/local/nagios/etc/objects/contacts.cfg‘...
Processing object config file ‘/usr/local/nagios/etc/objects/timeperiods.cfg‘...
Processing object config file ‘/usr/local/nagios/etc/objects/templates.cfg‘...
Processing object config file ‘/usr/local/nagios/etc/objects/hosts.cfg‘...
Processing object config file ‘/usr/local/nagios/etc/objects/services.cfg‘...
Processing object config directory ‘/usr/local/nagios/etc/objects/services‘...
   Read object config files okay...

Running pre-flight check on configuration data...

Checking services...
    Checked 12 services.
Checking hosts...
    Checked 2 hosts.
Checking host groups...
    Checked 1 host groups.
Checking service groups...
    Checked 0 service groups.
Checking contacts...
    Checked 1 contacts.
Checking contact groups...
    Checked 1 contact groups.
Checking service escalations...
    Checked 0 service escalations.
Checking service dependencies...
    Checked 0 service dependencies.
Checking host escalations...
    Checked 0 host escalations.
Checking host dependencies...
    Checked 0 host dependencies.
Checking commands...
    Checked 25 commands.
Checking time periods...
    Checked 5 time periods.
Checking for circular paths between hosts...
Checking for circular host and service dependencies...
Checking global event handlers...
Checking obsessive compulsive processor commands...
Checking misc settings...

Total Warnings: 0 Total Errors: 0 Things look okay - No serious problems were detected during the pre-flight check

To view the contents of the Nagios log:

[root@lb02 var]# tail nagios.log
[1536369288] LOG VERSION: 2.0 [1536369288] Finished daemonizing... (New PID=1423)
[1536369288] Error: Could not create external command file ‘/usr/local/nagios/var/rw/nagios.cmd‘ as named pipe: (2) -> No such file or directory.  If this file already exists and you are sure that another copy of Nagios is not running, you should delete this file.
[1536369288] Bailing out due to errors encountered while trying to initialize the external command file... (PID=1423)
[1536369446] Nagios 3.5.1 starting... (PID=1502)
[1536369446] Local time is Sat Sep 08 09:17:26 CST 2018 [1536369446] LOG VERSION: 2.0 [1536369446] Finished daemonizing... (New PID=1503)

Error reason: Basically I can't create nagios.cmd, to/usr/local/nagios/var directory to find no RW directory, created after reloading Nagios

[root@lb02 var]# mkdir rw
[root@lb02 var]# chown -R nagios.nagios rw
[root@lb02 var]# ll
total 40 drwxrwxr-x 2 nagios nagios 4096 Sep 6 12:55 archives -rw-r--r-- 1 nagios nagios 5 Sep 8 09:23 nagios.lock -rw-rw-r-- 1 nagios nagios 3991 Sep 8 09:23 nagios.log -rw-r--r-- 1 nagios nagios 17051 Sep 8 09:23 objects.cache -rw-rw-r-- 1 nagios nagios 0 Sep 8 09:23 retention.dat
drwxr-xr-x 2 nagios nagios 4096 Sep 8 09:25 rw
drwxr-xr-x 3 root   root 4096 Sep 6 12:55 spool

The correct monitoring effect is not loaded at this time.

Installing the Nagios Error