Learn step-by-step instructions to install Checkmk monitoring system on Rocky Linux 9. Follow this comprehensive guide to set up efficient monitoring for your infrastructure. #centlinux #linux #checkmk
Table of Contents
What is Checkmk?:
Checkmk is software developed in Python and C++ for IT Infrastructure monitoring. It is used for the monitoring of servers, applications, networks, cloud infrastructures (public, private, hybrid), containers, storage, databases and environment sensors.
Checkmk is available in three editions:
- an open source edition (“Checkmk Raw Edition – CRE”),
- a commercial enterprise edition (“Checkmk Enterprise Edition – CEE”) and
- a commercial edition for managed services providers (“Checkmk Managed Services Edition – CME”).
These Checkmk-Editions are available for a range of platforms, in particular for various versions of Debian, Ubuntu, SLES and Red Hat / CentOS, and also as a Docker Image. In addition, physical appliances of various sizes as well as a virtual appliance are offered to simplify the administration of the underlying operating system through a graphical user interface and to enable high-availability solutions.
The agents used by Checkmk to collect data are available for 11 platforms, including Windows. (Source: Wikipedia)
Environment Specification:
We are using a minimal Rocky Linux 9 virtual machine with following specifications.
- CPU – 3.4 Ghz (2 cores)
- Memory – 2 GB
- Storage – 20 GB
- Operating System – Rocky Linux release 9.1 (Blue Onyx)
- Hostname – checkmk-01.centlinux.com
- IP Address – 192.168.116.128/24
Prepare your Rocky Linux Server:
By using a ssh client, login to your Rocky linux server as root user.
If you are not used to Linux command line then we recommend that you should attend online training Linux Command Line: From novice to wizard
Set a Hostname (preferably FQDN) and configure Local DNS Resolver by executing following commands at Linux terminal.
# hostnamectl set-hostname checkmk-01.centlinux.com
# echo "192.168.116.128 checkmk-01 checkmk-01.centlinux.com" >> /etc/hosts
Execute following command to update software packages in your Linux operating system.
# dnf update -y
If a software package related to Linux Kernel is updated by the above command, then you should reboot your Linux operating system with newly installed Kernel.
# reboot
After reboot, login as root user and check your Linux operating system and Kernel versions.
# cat /etc/rocky-release Rocky Linux release 9.1 (Blue Onyx) # uname -r 5.14.0-162.23.1.el9_1.x86_64
Install Third Party Yum Repositories:
To install Checkmk software, you will require some software package from EPEL (Extra Packages for Enterprise Linux) yum repository. Therefore, you should install it now, by executing dnf command.
# dnf install -y epel-release
EPEL requires some packages from CRB (CodeReady Linux Builder) yum repository. Therefore, it will be better if you enable CRB yum repository too.
You can execute following command at Linux terminal to enable CRB yum repository.
# /usr/bin/crb enable Enabling CRB repo CRB repo is enabled and named: crb
Build your cache for newly installed yum repositories.
# dnf makecache
Configure SELinux and Linux Firewall:
Execute following Linux command to set SELinux boolean that allows your web server to access the network interfaces.
# setsebool -P httpd_can_network_connect 1
Allow the http service in Linux firewall.
# firewall-cmd --permanent --add-service=http success # firewall-cmd --reload success
Install Checkmk on Rocky Linux:
You can download different versions of this network monitoring software from Checkmk official website.
But we recommend that, you download RAW version of Checkmk if you do not have a license.
RAW version is open source edition and it is free to use under GNU GPL license.
Select your preferred Checkmk version, Platfrom and OS version. The same webpage will generate a Linux command according to your selection to download checkmk software.
Copy the command from Checkmk website to download the software straight from Linux terminal.
But you need to install wget command, because it is not preinstalled on minimal Rocky Linux 9 operating systems.
# dnf install -y wget
Now execute wget command to download Checkmk software.
# wget https://download.checkmk.com/checkmk/2.1.0p25/check-mk-raw-2.1.0p25-el9-38.x86_64.rpm --2023-04-12 22:03:22-- https://download.checkmk.com/checkmk/2.1.0p25/check-mk-raw-2.1.0p25-el9-38.x86_64.rpm Resolving download.checkmk.com (download.checkmk.com)... 45.133.11.29 Connecting to download.checkmk.com (download.checkmk.com)|45.133.11.29|:443... connected. HTTP request sent, awaiting response... 200 OK Length: 167168936 (159M) [application/x-redhat-package-manager] Saving to: ‘check-mk-raw-2.1.0p25-el9-38.x86_64.rpm’ check-mk-raw-2.1.0p 100%[===================>] 159.42M 439KB/s in 7m 1s 2023-04-12 22:10:24 (388 KB/s) - ‘check-mk-raw-2.1.0p25-el9-38.x86_64.rpm’ saved [167168936/167168936]
You have already setup the required yum repositories, therefore, you can easily install checkmk software by executing following dnf command.
# dnf localinstall -y check-mk-raw-2.1.0p25-el9-38.x86_64.rpm
Verify installation of Checkmk software by querying it’s version by using omd command.
# omd version OMD - Open Monitoring Distribution Version 2.1.0p25.cre
Configure Checkmk Monitoring:
Create a new monitoring instance by using omd command.
# omd create monitoring
Adding /opt/omd/sites/monitoring/tmp to /etc/fstab.
Creating temporary filesystem /omd/sites/monitoring/tmp...OK
Updating core configuration...
Generating configuration for core (type nagios)...
Precompiling host checks...OK
Executing post-create script "01_create-sample-config.py"...OK
Restarting Apache...OK
Created new site monitoring with version 2.1.0p25.cre.
The site can be started with omd start monitoring.
The default web UI is available at http://checkmk-01.centlinux.com/monitoring/
The admin user for the web applications is cmkadmin with password: rPOtCNpZ
For command line administration of the site, log in with 'omd su monitoring'.
After logging in, you can change the password for cmkadmin with 'cmk-passwd cmkadmin'.
Note down the URL of Checkmk Web UI and Password for chkadmin user.
Start the monitoring instance now.
# omd start monitoring Temporary filesystem already mounted Starting agent-receiver...OK Starting mkeventd...OK Starting rrdcached...OK Starting npcd...OK Starting nagios...OK Starting apache...OK Starting redis...OK Initializing Crontab...OK
Change the Password of chkadmin user.
# omd su monitoring OMD[monitoring]:~$ cmk-passwd cmkadmin New password: Re-type new password: OMD[monitoring]:~$ exit logout
Access Checkmk Dashboards:
Open URL http://checkmk-01.centlinux.com/monitoring in a web browser.
Login as chkadmin user.
You have reached at the Dashboards of Checkmk monitoring software.
Video: How to install Checkmk on Linux
Final Thoughts
Process to install Checkmk on Rocky Linux 9 opens up a world of possibilities for robust infrastructure monitoring. By carefully following the installation steps and obtaining the required software packages from the EPEL & CRB repositories, you’ll empower yourself to keep a close eye on your system’s health and performance. With monitoring in place, you can proactively address issues and optimize your infrastructure for maximum efficiency and reliability.