Fresh Install Nagios 4 "Error in configuration file"

[t3dus]

So I'm working on installing Nagios 4 on a fresh Centos 7 VM and I did all the steps as outlind in this article http://tecadmin.net/install-nagios-core ... ntos-rhel/# but I'm stuck at step 6 which is to verify Nagios install by running the command below

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/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg

Which results in this error

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# /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg

Nagios Core 4.1.1
Copyright (c) 2009-present Nagios Core Development Team and Community Contributors
Copyright (c) 1999-2009 Ethan Galstad
Last Modified: 08-19-2015
License: GPL

Website: https://www.nagios.org
Reading configuration data...
Error in configuration file '/usr/local/nagios/etc/nagios.cfg' - Line 452 (Check result path '/usr/local/nagios/var/spool/checkresults' is not a valid directory)
   Error processing main config file!

Anyways I know very little about CentOS but I need to resolve this issue and need advice on how to go about doing it.

Thank You in advance.

[Box293]

What is the output of these commands:

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ls -al /usr/local/nagios
ls -alR /usr/local/nagios/var

[t3dus]

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# ls -al /usr/local/nagios
total 16
drwxr-xr-x.  9 root   root     87 Feb  4 15:38 .
drwxr-xr-x. 13 root   root   4096 Feb  4 15:29 ..
drwxrwxr-x.  2 nagios nagios   36 Feb  4 15:29 bin
drwxrwxr-x.  3 nagios nagios   70 Feb  4 15:29 etc
drwxr-xr-x.  2 root   root      6 Feb  4 15:38 include
drwxr-xr-x.  2 root   root   4096 Feb  4 15:38 libexec
drwxrwxr-x.  2 nagios nagios 4096 Feb  4 15:29 sbin
drwxrwxr-x. 15 nagios nagios 4096 Feb  4 15:38 share
drwxr-xr-x.  3 root   root     39 Feb  4 15:43 var

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]# ls -alR /usr/local/nagios/var
/usr/local/nagios/var:
total 4
drwxr-xr-x. 3 root   root    39 Feb  4 15:43 .
drwxr-xr-x. 9 root   root    87 Feb  4 15:38 ..
-rw-r--r--. 1 nagios nagios 255 Feb  4 15:43 nagios.configtest
drwxrwsr-x. 2 nagios nagcmd   6 Feb  4 15:29 rw

/usr/local/nagios/var/rw:
total 0
drwxrwsr-x. 2 nagios nagcmd  6 Feb  4 15:29 .
drwxr-xr-x. 3 root   root   39 Feb  4 15:43 ..

[rkennedy]

i ran through a fresh install, and made the mistake of not disabling SELinux the other day. I ran into the exact same issue. Can you confirm that SELinux is running on your machine with the command getenforce?

I'm setting up a test machine to replicate this now, as well.

[t3dus]

I ran this command and got these results.

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# sestatus
SELinux status:                 enabled
SELinuxfs mount:                /sys/fs/selinux
SELinux root directory:         /etc/selinux
Loaded policy name:             targeted
Current mode:                   enforcing
Mode from config file:          enforcing
Policy MLS status:              enabled
Policy deny_unknown status:     allowed
Max kernel policy version:      28

[hsmith]

What happens if you run the command setenforce 0, and then try to start nagios once more.

[rkennedy]

I ran through testing this morning, and the underlying issue is having SELinux enabled when you compile Nagios. It ends up not creating some folders / files, as well as permissions. I wrote up these instructions this morning. You will be better off to install it the proper way. While they are not official yet (still have to go through testing) they should work.

These assume a fresh install of Centos 7, minimal. I am disabling SELinux in these instructions.

SELINUX:
setenforce 0
nano /etc/selinux/config
change enforcing -> disabled, save and close.

INSTALL PRE-REQS:
yum install httpd php php-cli gcc glibc glibc-common gd gd-devel net-snmp openssl-devel wget unzip -y
useradd nagios
groupadd nagcmd
usermod -a -G nagcmd nagios
usermod -a -G nagcmd apache

DOWNLOAD & INSTALL NAGIOS:
cd /tmp
wget https://assets.nagios.com/downloads/nag ... 1.1.tar.gz
wget http://www.nagios-plugins.org/download/ ... 1.1.tar.gz
tar zxf nagios-4.1.1.tar.gz
tar zxf nagios-plugins-2.1.1.tar.gz
cd nagios-4.1.1
./configure --with-command-group=nagcmd
make all
make install
make install-init
make install-config
make install-commandmode
make install-webconf
htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin
service httpd start
service nagios start

PLUGINS:
cd /tmp/nagios-plugins-2.1.1
./configure --with-nagios-user=nagios --with-nagios-group=nagios --with-openssl
make all
make install
service nagios restart

POSSIBLE ERRORS:
Can't access web page? Check firewalld and at port 80 through.
firewall-cmd --zone=public --add-port=80/tcp --permanent
firewall-cmd --reload

Still can't access web page? Check IPV6 listening in the apache configuration.
modify /etc/httpd/conf/httpd.conf
Listen 0.0.0.0:80
service httpd restart

[t3dus]

What happens if you run the command setenforce 0, and then try to start nagios once more.

I get this error when verifying

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# /usr/bin/install -c -m 644 sample-config/httpd.conf /etc/httpd/conf.d/nagios.conf
/usr/bin/install: cannot stat ‘sample-config/httpd.conf’: No such file or directory

And this error when trying to start Nagios

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# service nagios start
Starting nagios (via systemctl):  Job for nagios.service failed because the control process exited with error code. See "systemctl status nagios.service" and "journalctl -xe" for details.
                                                           [FAILED]

[t3dus]

I ran through testing this morning, and the underlying issue is having SELinux enabled when you compile Nagios. It ends up not creating some folders / files, as well as permissions. I wrote up these instructions this morning. You will be better off to install it the proper way. While they are not official yet (still have to go through testing) they should work.

These assume a fresh install of Centos 7, minimal. I am disabling SELinux in these instructions.

SELINUX:
setenforce 0
nano /etc/selinux/config
change enforcing -> disabled, save and close.

INSTALL PRE-REQS:
yum install httpd php php-cli gcc glibc glibc-common gd gd-devel net-snmp openssl-devel wget unzip -y
useradd nagios
groupadd nagcmd
usermod -a -G nagcmd nagios
usermod -a -G nagcmd apache

DOWNLOAD & INSTALL NAGIOS:
cd /tmp
wget https://assets.nagios.com/downloads/nag ... 1.1.tar.gz
wget http://www.nagios-plugins.org/download/ ... 1.1.tar.gz
tar zxf nagios-4.1.1.tar.gz
tar zxf nagios-plugins-2.1.1.tar.gz
cd nagios-4.1.1
./configure --with-command-group=nagcmd
make all
make install
make install-init
make install-config
make install-commandmode
make install-webconf
htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin
service httpd start
service nagios start

PLUGINS:
cd /tmp/nagios-plugins-2.1.1
./configure --with-nagios-user=nagios --with-nagios-group=nagios --with-openssl
make all
make install
service nagios restart

POSSIBLE ERRORS:
Can't access web page? Check firewalld and at port 80 through.
firewall-cmd --zone=public --add-port=80/tcp --permanent
firewall-cmd --reload

Still can't access web page? Check IPV6 listening in the apache configuration.
modify /etc/httpd/conf/httpd.conf
Listen 0.0.0.0:80
service httpd restart

I'll try to do a fresh install again with your instructions and see how that works for me.

Thanks

[hsmith]

Let us know how it works. Thanks!