This is Part-1 of complete article How to Setup Nagios Monitoring Server with NagiosQL on CentOS/RHEL 7/6, In this part, you will find the steps to setup Nagios Monitoring Server on CentOS, Redhat, and Fedora systems.
Step 1 – Install Required Packages
We assume that you have fresh installed CentOS, Red Hat or Fedora systems, So our first requirement is to install Apache and PHP first. Use the following commands to complete it. You can find detailed LAMP setup instruction here.
Install Packages:
yum install httpd php php-cli gcc unzip wget glibc glibc-common gd gd-devel net-snmp yum groupinstall "development tools"
Start Apache:
service httpd start
Step 2 – Setup User Accounts
Now create a new nagios user account and setup a password to this account
useradd nagios passwd nagios
Now create a groud for nagios setup “nagcmd” and add nagios user to this group. Also add nagios user in apache group.
groupadd nagcmd usermod -a -G nagcmd nagios usermod -a -G nagcmd apache
Step 3 – Install Nagios Core Service
After installing the required dependencies and adding user accounts. Let’s start with the Nagios core installation. Download the latest Nagios core service from the official site.
cd /opt/ wget https://assets.nagios.com/downloads/nagioscore/releases/nagios-4.4.5.tar.gz tar xzf nagios-4.4.5.tar.gz cd nagios-4.4.5 ./configure --with-command-group=nagcmd make all make install make install-init make install-daemoninit make install-config make install-commandmode make install-exfoliation
Now use below command to setup Apache configuration for Nagios installation.
make install-webconf
Step 4 – Configure Apache Authentication
We need to setup apache authentication for user nagiosadmin. Do not change this username. else you would required more changes in configuration.
htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin
Now restart Apache service to make the new settings take effect.
service httpd restart
Step 5 – Install Nagios Plugins
After installing and configuring Nagios core service, Download latest nagios-plugins source and install using the following commands.
cd /opt wget http://nagios-plugins.org/download/nagios-plugins-2.2.1.tar.gz tar xzf nagios-plugins-2.2.1.tar.gz cd nagios-plugins-2.2.1
Now compile and install nagios plugins
./configure --with-nagios-user=nagios --with-nagios-group=nagios make make install
Step 6 – Verify and Start Nagios
First, verify the Nagios configuration file using the following command.
/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
If there is no error, let’s start the Nagios serivce
service nagios start
Step 7 – Access Nagios in Web Browser
Nagios creates its own apache configuration file /etc/httpd/conf.d/nagios.conf. There are no need to make any changes to it. Simply open below url in browser.
http://tecadmin.example.net/nagios/
Prompting for Apache Authentication Password –
Nagios After login screen –
Finally, you have successfully installed and configured Nagios core service in your system. Now go to article install NagiosQL3 web interface for managing Nagios.
Excellent post! We will be linking to this particularly great content on our site.
Keep up the good writing.
Great information shared. Adding a few lines about Nagios, ” Nagios provides complete monitoring of Linux operating systems and distributions – including operating system metrics, service state, process state, file system usage, and more.”
Awesome!. Perfect guide.
Your first step successfully done[How to Install Nagios 4 (Monitoring Server) on CentOS/RHEL 7/6] & its very helpful to understand. Would u plz tell me process, how to add host? & what another services are need to installed ? Plz Note I am using centos7 .
Reagards
This is just a simple guide, but check some examples.
–Open this file
nano /usr/local/nagios/etc/nagios.cfg
—search and uncoment
#cfg_file=/usr/local/nagios/etc/objects/switch.cfg
—to
cfg_file=/usr/local/nagios/etc/objects/switch.cfg
—close file
—Open and add these command below (host and 2 services to monitoring)
nano /usr/local/nagios/etc/objects/switch.cfg
define host{
use generic-switch
host_name switchcore01
alias swtich main num 1
address 10.10.10.3
hostgroups switches
}
define service{
use generic-service
host_name switchcore01
service_description PING
check_command check_ping!200.0,20%!600.0,60%
normal_check_interval 5
retry_check_interval 1
}
define service {
use generic-service
host_name switchcore01
service_description Uptime
check_command check_snmp!-C MYCOMMUNITYHERE -o sysUpTime.0
}
—-close the file
—–checck the config
sudo /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
— now reload the service
sudo service nagios reload
—-You can see on the web browser.
Regards
am getting some warning while installing Nagios in centos through putty
Hi Rahul, may I know what is port number RRD database uses in Nagios.
Hi I followed all lines.
While i was writing command make make all
got error “make: *** No rule to make target `all’. Stop.”
make utility allready installed.
Please help in this.
hi i am serge
i have install nagios properly when i run nagios.service i have this message “job for nagios.service failed because the control process exited with error code” thanks for your help
i am getting Authorization Required problem
Hi Team,
I installed Nagios on Linux, with all the steps as mentioned above. but while logging I am not able to login. getting error like
” Authorization Required
This server could not verify that you are authorized to access the document requested. Either you supplied the wrong credentials (e.g., bad password), or your browser doesn’t understand how to supply the credentials required.
Apache/2.2.15 (Red Hat) Server at 172.29.218.194 Port 80″
Can some one help on this please.
i have gone through all the commands its open login page where i put the user nagioadmin and password i gave at the time of creation on user, but the user is not authenticated, please tell me whats error. i have changed the password of this user as well but go not log in.
please tell
Hey Bilal,
Not sure if you have the correct user name. It is nagiosadmin and not nagioadmin . I was able to get it working without any issues
Very good notes
and i have one question
if you create a two user u1 and u2
and first log in to u1 and without logout
try to log in to u2 it is asking some password
by defualt what password it is tacking can you please solve this query….
Complete steps! – installed on CentOS 6 x64 after much trying and reading…
Nagios Centos Install
# rpm -Uvh http://download.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
# rpm -Uvh http://rpms.famillecollet.com/enterprise/remi-release-6.rpm
yum –enablerepo=remi install httpd
service httpd start
chkconfig httpd on
sudo rpm -Uvh http://dev.mysql.com/get/mysql-community-release-el7-5.noarch.rpm
yum install mysql mysql-server
service mysqld start
yum install php php-mysql
yum install php-common php-cli php-mysql php-devel
service httpd restart
service mysqld restart
yum install httpd php php-cli gcc glibc glibc-common gd gd-devel net-snmp
service httpd start
useradd nagios
passwd nagios
Step 2: Setup User Accounts
Now create a new nagios user account and setup a password to this account
# useradd nagios
# passwd nagios
Now create a groud for nagios setup “nagcmd” and add nagios user to this group. Also add nagios user in apache group.
# groupadd nagcmd
# usermod -a -G nagcmd nagios
# usermod -a -G nagcmd apache
Step 3: Install Nagios Core Service
After installing required dependencies and adding user accounts. Lets start with Nagios core installation. Download latest nagios core service from official site.
# cd /opt/
# wget http://prdownloads.sourceforge.net/sourceforge/nagios/nagios-4.0.8.tar.gz
# tar xzf nagios-4.0.8.tar.gz
# cd nagios-4.0.8
# ./configure –with-command-group=nagcmd
# make all
# make install
# make install-init
# make install-config
# make install-commandmode
Now use below command to setup apache configuration for Nagios installation.
# make install-webconf
Step 4: Configure Apache Authentication
We need to setup apache authentication for user nagiosadmin. Do not change this username. else you would required more changes in configuration.
# htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin
Now restart Apache service to make the new settings take effect.
# service httpd restart
Step 5: Install Nagios Plugins
After installing and configuring Nagios core service, Download latest nagios-plugins source and install using following commands.
# cd /opt
# wget http://nagios-plugins.org/download/nagios-plugins-2.0.3.tar.gz
# tar xzf nagios-plugins-2.0.3.tar.gz
# cd nagios-plugins-2.0.3
Now compile and install nagios plugins
# ./configure –with-nagios-user=nagios –with-nagios-group=nagios
# make
# make install
Step 6: Verify and Start Nagios
Use the following commands to verify nagios install and start nagios core service.
# /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
# service nagios start
Also configure nagios service to start on system start
# chkconfig –add nagios
# chkconfig nagios on
firewall-cmd –add-port=80/tcp –permanent
# vim /etc/sysconfig/selinux
SELINUX=disabled
REBOOT SERVER.
Service mysqld start
service https start
service nagios start
Logon on to nagios from web brower!
it’s not comment
thank you so much for your effort writing this article
i want to say unzip is a mandatory package for installation
Hello Rahul,
i have a question,
why we have to install apache and not nginx? (I am not asking the differences between them) but it has to do with the nagios program? e.g isn’t compatible or something like that?
Successfully Installed through follow your steps. but what is the main benefit for to install nagios ?
With Nagios, you can monitor your entire infrastructure (critical servers and network components) with ease, on a web interface. In case anything goes wrong, you receive a notification and the issue gets addressed in timely manner.
And best thing is that, Nagios Core is Free and Open Source, so you can customize it as per your needs.
Thanks.
I followed the steps and it works the only issue I had it was:
Permission denied: exec of ‘/usr/local/nagios/sbin/statusjson.cgi’ failed, referer: http://myserver/nagios/main.php
I fixed with
chcon -R -t httpd_sys_content_t /usr/local/nagios
Thanks
Hi
I finish all progress . but I can’t see local host status
Current, My nagios web page show the message ‘unable to get process status’
Do you know this problem?
I am getting this error when i am trying to open via browser
Forbidden
You don’t have permission to access /nagios on this server.
Hi,
We are trying to install this, and all went well – but on the homepage we get an error saying “Unable to get process status” and no other page will load – internal server error.
Steve
I had this problem as well. Try the selinux suggestion above. When things don’t work and you did everything right with no errors, for me 9 times out of 10 the problem is selinux. I try to remember to try this first now.
Hello,
I have followed these steps and it is successfully installed on my VM (CentOS) and everything was fine but next day when I again poweered on my VM and tried to take web access it gives me an error I have checked nagios service and process as well but no use I’m not able to get my web access
any one can help…
“” FACING PROBLEM WITH FOLLOWING ERROR”
make[1]: Leaving directory `/opt/nagios-plugins-2.0.3/po’
make[1]: Entering directory `/opt/nagios-plugins-2.0.3′
make[2]: Entering directory `/opt/nagios-plugins-2.0.3′
make[2]: Nothing to be done for `install-exec-am’.
make[2]: Nothing to be done for `install-data-am’.
make[2]: Leaving directory `/opt/nagios-plugins-2.0.3′
make[1]: Leaving directory `/opt/nagios-plugins-2.0.3′
[[email protected] nagios-plugins-2.0.3]# /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
bash: /usr/local/nagios/bin/nagios: No such file or directory
<
If you have SELinux enabled then you need to run:
chcon -R -t httpd_sys_content_t /usr/local/nagios
thanks thomaz its works for me..,
When accessing the nagios weblink http:///nagios I am receiving
403 Forbidden
You don’t have permission to access /nagios on this server.
Any ideas on how to fix this issue?
You may need access http://hostname/nagios
It works GREAT and thanks however, when i reboot the server nagios does not start back up.
I have doen theis on CentOS 6.5 then 7 same results.
Please help.
Hi Rahul,
Recently, I just deleted my /etc/passwd and /etc/group file in my nagios server. Luckily, I restored it from the backup I had. But after that, I am not able to import data to remote nagios server over SSH/SFTP using nagiosql.
I can login directly without password from local system to remote system, but getting error for permission check. I have also tried to change ownership to apache user and nagios user vice-versa. But no use. Do you have exact idea where should I be wrong going as unluckily, I had restarted the corrupted slave simnagios and due to that getting stale results.
Hello Naresh,
Can you please provide me complete error message you are getting.
Hi Rahul,
I am able to install and open the Nagios. i need to configure the my servers and switches . Please let me know the process
Hi Kiran,
You can go through the following articles to monitor remote hosts.
https://tecadmin.net/monitor-remote-windows-host-using-nagios/
https://tecadmin.net/monitor-remote-linux-host-using-nagios/
https://tecadmin.net/monitor-remote-linux-system-nagios-via-ssh/
https://tecadmin.net/install-nrpe-on-ubuntu/
Hi Rahul,
Thank you very much for quick response i will go through the link if thing i need your help i will ping you
I have problem with NagiosQL3 Web Installer.
Please, help me
Thanks
Update config file permission to 777 and refresh page
$ chmod -R 777 config
Thanks for reply, but terminal was wrote: directory or file does not exist. In directory html/webadmin is created directory config.
Hi Hubalda,
If you are talking about warning “setting file doesn’t exists”, Then no worry, Just continue to next if other issues are fixed. setting.php will automatically created by installer using input given.
config has permission 777, but still not working. I talkinig about Write test on setting directory… failed
I solved this problem. Thanks for your help.
Solution:
$ echo 0 >/selinux/enforce
$ sed -i ‘s/SELINUX=enforcing/SELINUX=disable/’ /etc/selinux/config
Sounds good Hubalda..
Good catch
thanks for the tutorial bro ; )
I’ve gone through all your steps several times and it still doesn’t work. I can navigate to the site “Settings file not found or not readable (config/settings.php). Upgrade not available!” When i click the Start installation it says “SSH2: Not Available”, “MySQL: Not Available”, “date.timezon: Not Available (cannot be empty and needs to be set)”, “Write test on settings directory (config/): failed”
Now i’ve installed all of these programs and started/added to services. I’ve edited the php.ini file to have America/Denver as my timezone. I’ve disable the iptables to make sure somethings not being blocked.
Do you have any input on how i can solve this. Any assistance would be much appreciated.
Hi Jon,
1. make sure you have assigned privileges to apache user on config directory
2. To install SSH2 use below commands.
# yum install libssh2-devel libssh2
# pecl install ssh2
or
# pecl install channel://pecl.php.net/ssh2-0.12
3. For MysQL
# yum install php-mysql
I hope above steps will fix your issues.
Thank you for your reply. I’m still having issues getting pecl install ssh2 and pecl install channel://pecl.php.net/ssh2-0.12 installed. it gives me an error. ERROR: ‘phpize’ failed. If you have input it would be much appreciated.
Thanks,
Jon
Hi John,
Can you please provide full output of both commands
So I’ve actually resolved the ssh2 issue now. But I’m now unable to get mysql to work. It says “MySQL: Not Available”.
Now I’m quite sure i’ve installed everything properly. This only thing i’m questionable on is php-mysql. I’ve tried the yum install php-mysql with no success. It returns:
Loaded plugins: fastestmirror, security
Loading mirror speeds from cached hostfile
* base: mirrors.usinternet.com
* epel: linux.mirrors.es.net
* extras: mirrors.xmission.com
* updates: mirrors.easynews.com
Setting up Install Process
Resolving Dependencies
–> Running transaction check
—> Package php-mysql.x86_64 0:5.3.27-1.el6 will be installed
–> Processing Dependency: php-pdo(x86-64) = 5.3.27-1.el6 for package: php-mysql-5.3.27-1.el6.x86_64
–> Running transaction check
—> Package php-pdo.x86_64 0:5.3.27-1.el6 will be installed
–> Processing Dependency: php-common(x86-64) = 5.3.27-1.el6 for package: php-pdo-5.3.27-1.el6.x86_64
–> Finished Dependency Resolution
Error: Package: php-pdo-5.3.27-1.el6.x86_64 (CentALT)
Requires: php-common(x86-64) = 5.3.27-1.el6
Installed: php-common-5.4.19-1.el6.remi.x86_64 (@remi)
php-common(x86-64) = 5.4.19-1.el6.remi
Available: php-common-5.3.3-22.el6.x86_64 (base)
php-common(x86-64) = 5.3.3-22.el6
Available: php-common-5.3.3-23.el6_4.x86_64 (updates)
php-common(x86-64) = 5.3.3-23.el6_4
Available: php-common-5.3.27-1.el6.x86_64 (CentALT)
php-common(x86-64) = 5.3.27-1.el6
You could try using –skip-broken to work around the problem
You could try running: rpm -Va –nofiles –nodigest
So I’m not sure if its a installation problem or if i need to configure a file or something.
Thanks,
Jon Nelson
Hi John,
You are using php-common-5.4.19-1.el6.remi.x86_64 (@remi), But php-mysql is trying to install 5.3. Try below methods
Method 1:
yum –enablerepo=remi install php-mysql
Method 2: If method 1 failed, try to download rpms manually and install them using rpm command.
ftp://fr2.rpmfind.net/linux/remi/enterprise/6/remi/x86_64/php-mysql-5.4.19-1.el6.remi.x86_64.rpm
ftp://fr2.rpmfind.net/linux/remi/enterprise/6/remi/x86_64/php-pdo-5.4.19-1.el6.remi.x86_64.rpm
If you still get any dependencey error, download that at below location and install manually
ftp://fr2.rpmfind.net/linux/remi/enterprise/6/remi/x86_64/
I hope it will help you..
So I see that when I install MySQL it installs mariadb instead. Do you think this would be causing a linking error? Do you know why mariadb is installing instead of MySQL? I’m confused as to why this is being so much trouble.
Thanks again!
Jon
No, php-mysql package will work with MariaDB as well.. That is not an issue..
thanks for very good info