Internal server error

[Nagius]

Hi,

I have a problem in my apache server when I try to open nagios. Apache works correctly. But when I put http://localhost/nagios the web give me this message [img] (image attached).

The configuration that I use is:

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nagios@nagios-VirtualBox:: ~~$ sudo su
root@nagios-VirtualBox:: /home/nagios#
root@nagios-VirtualBox: /home/nagios#sudo apt-get install wget build-essential apache2 php5-gd libgd2-xpm libgd2-xpm-dev libapache2-mod-php5
root@nagios-VirtualBox: /home/nagios #mkdir Nagios
root@nagios-VirtualBox: /home/nagios # cd /Nagios
root@nagios-VirtualBox: /home/nagios /Nagios#wget http://prdownloads.sourceforge.net/sourceforge/nagios/nagios-4.0.4.tar.gz
root@nagios-VirtualBox: /home/nagios /Nagios #wget http://nagios-plugins.org/download/nagios-plugins-2.0.tar.gz
root@nagios-VirtualBox: /home/nagios /Nagios #useradd nagios –p nagios123
root@nagios-VirtualBox: /home/nagios /Nagios #groupadd nagios1
root@nagios-VirtualBox: /home/nagios /Nagios #usermod -a -G nagios1 nagios
root@nagios-VirtualBox: /home/nagios /Nagios #tar zxvf nagios-4.0.4.tar.gz
root@nagios-VirtualBox: /home/nagios /Nagios #tar zxvf nagios-plugins-2.0.tar.gz
root@nagios-VirtualBox: /home/nagios /Nagios # cd nagios-4.0.4
root@nagios-VirtualBox: /home/nagios /Nagios /Nagios-4.0.4#./configure --with-nagios-group=nagios --with-command-group=nagios1 -–with-mail=/usr/bin/sendmail --with-httpd-conf=/etc/apache2/sites-enabled
root@nagios-VirtualBox: /home/nagios /Nagios /Nagios-4.0.4# make all
root@nagios-VirtualBox: /home/nagios /Nagios /Nagios-4.0.4# make install
root@nagios-VirtualBox: /home/nagios /Nagios /Nagios-4.0.4# make install-init
root@nagios-VirtualBox: /home/nagios /Nagios /Nagios-4.0.4# make install-config
root@nagios-VirtualBox: /home/nagios /Nagios /Nagios-4.0.4# make install commandmode
root@nagios-VirtualBox: /home/nagios /Nagios /Nagios-4.0.4#  make install-webconf
root@nagios-VirtualBox: /home/nagios /Nagios /Nagios-4.0.4# make install-webconf
root@nagios-VirtualBox: /home/nagios /Nagios /Nagios-4.0.4#  cp -R contrib/eventhandlers/ /usr/local/nagios/libexec/ 
root@nagios-VirtualBox: /home/nagios /Nagios /Nagios-4.0.4#  chown -R nagios:nagios1 /usr/local/nagios/libexec/eventhandlers
root@nagios-VirtualBox: /home/nagios /Nagios /Nagios-4.0.4# /usr/local/nagios/bin/nagios –v /usr/local/nagios/etc/nagios.cfg 
root@nagios-VirtualBox: /home/nagios /Nagios /Nagios-4.0.4#  /etc/init.d/nagios start
root@nagios-VirtualBox: /home/nagios /Nagios /Nagios-4.0.4#  htpasswd –c /usr/local/nagios/etc/htpasswd.users nagiosadmin
root@nagios-VirtualBox: /home/nagios /Nagios /Nagios-4.0.4#  cd  ..
root@nagios-VirtualBox: /home/nagios /Nagios #  cd  nagios-plugins-2.0 
root@nagios-VirtualBox: /home/nagios /Nagios /nagios-plugins-2.0# ./configure --with-nagios-user=nagios --with-nagios-group=nagios1 --with-httpd-conf=/etc/apache2/sites-enabled
root@nagios-VirtualBox: /home/nagios /Nagios /nagios-plugins-2.0# make 
root@nagios-VirtualBox: /home/nagios /Nagios /nagios-plugins-2.0# make install
root@nagios-VirtualBox: /home/nagios /Nagios /nagios-plugins-2.0#sysv-rc-conf –list Nagios
root@nagios-VirtualBox: /home/nagios /Nagios /nagios-plugins-2.0#sysv-rc-conf –list httpd
root@nagios-VirtualBox: /home/nagios /Nagios /nagios-plugins-2.0#sysv-rc-conf –level 35 nagios on
root@nagios-VirtualBox: /home/nagios /Nagios /nagios-plugins-2.0# sysv-rc-conf –level 35 httpd on
root@nagios-VirtualBox: /home/nagios /Nagios /nagios-plugins-2.0 ln -s /etc/init.d/nagios /etc/rcS.d/S99nagios
root@nagios-VirtualBox: /home/nagios /Nagios /nagios-plugins-2.0#iptables -I INPUT -p tcp --destination-port 80 -j ACCEPT
root@nagios-VirtualBox: /home/nagios /Nagios /nagios-plugins-2.0#apt-get install -y iptables-persistent
root@nagios-VirtualBox: /home/nagios /Nagios /nagios-plugins-2.0#a2enmod rewrite
root@nagios-VirtualBox: /home/nagios /Nagios /nagios-plugins-2.0#a2enmod cgi
root@nagios-VirtualBox: /home/nagios /Nagios /nagios-plugins-2.0#service apache2 restart

Can anybody help me?

Thanks

[Box293]

It SELinux installed and enabled?

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getenforce

If it is, at least set it to permissive:

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sed -i 's/SELINUX=enforcing/SELINUX=permissive/g' /etc/selinux/config
setenforce 0

Is this a fresh build or did it just start happening?

Run these commands

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tail /var/log/syslog -n 100 > /tmp/syslog_log.txt
tail /var/log/apache2/error.log -n 100 > /tmp/apache2_log.txt

Send us these files:
/tmp/syslog_log.txt
/tmp/apache2_log.txt

[Nagius]

Hi,

I do all the steps that you give me but the error persist.

apache2_log.txt

(9.37 KiB) Downloaded 301 times

syslog_log.txt

(10.83 KiB) Downloaded 317 times

Thanks

[hsmith]

Is this a fresh build or did it just start happening?

Can you please elaborate on this?

[Nagius]

I create the virtual machine and configure nagios on it last week, so its a fresh build. And it did occur when I finish configure nagios with te configuration that I post it and I tried to enter nagios via web.

[rkennedy]

It SELinux installed and enabled?

Code: Select all

getenforce

Can you post the result of this?

[Box293]

Also, what is the output of these commands:

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ls -al /usr/local/nagios/etc/
ls -al /etc/apache2/sites-enabled/
grep nag /etc/passwd
grep nag /etc/group

[Nagius]

Code: Select all

root@nagios-VirtualBox:/home/nagios# getenforce
Disabled
root@nagios-VirtualBox:/home/nagios# ls -al /usr/local/nagios/etc/
total 76
drwxrwxr-x 3 nagios nagios  4096 oct 31 21:41 .
drwxr-xr-x 9 root   root    4096 oct 31 21:44 ..
-rw-rw-r-- 1 nagios nagios 12015 oct 31 21:35 cgi.cfg
-rw-r--r-- 1 root   root      50 oct 31 21:41 httpasswd.users
-rw-rw-r-- 1 nagios nagios 44475 oct 31 21:35 nagios.cfg
drwxrwxr-x 2 nagios nagios  4096 oct 31 21:35 objects
-rw-rw---- 1 nagios nagios  1312 oct 31 21:35 resource.cfg
root@nagios-VirtualBox:/home/nagios# ls -al /etc/apache2/sites-enabled/
total 12
drwxr-xr-x 2 root root 4096 oct 31 21:35 .
drwxr-xr-x 8 root root 4096 oct 31 21:18 ..
lrwxrwxrwx 1 root root   35 oct 31 21:19 000-default.conf -> ../sites-available/000-default.conf
-rw-r--r-- 1 root root  982 oct 31 21:35 nagios.conf
root@nagios-VirtualBox:/home/nagios#
root@nagios-VirtualBox:/home/nagios# grep nag /etc/passwd
list:x:38:38:Mailing List Manager:/var/list:/usr/sbin/nologin
lightdm:x:112:118:Light Display Manager:/var/lib/lightdm:/bin/false
colord:x:113:121:colord colour management daemon,,,:/var/lib/colord:/bin/false
nagios:x:1000:1000:nagios,,,:/home/nagios:/bin/bash
root@nagios-VirtualBox:/home/nagios# grep nag /etc/group
adm:x:4:syslog,nagios
cdrom:x:24:nagios
sudo:x:27:nagios
dip:x:30:nagios
plugdev:x:46:nagios
lpadmin:x:108:nagios
nagios:x:1000:
sambashare:x:124:nagios
nagios1:x:1001:nagios
root@nagios-VirtualBox:/home/nagios#

[Box293]

I suspect the www-data user (apache) is not a member of the nagios group and hence is the cause of your issue. Try this command:

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usermod -a -G nagios www-data

[Nagius]

I put that command but the error persist