CheckMK Setup

Initial Setup:


root@Monitoring:~# ip a | grep inet
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host
    inet 10.0.0.201/16 brd 10.0.255.255 scope global ens18
    inet6 fe80::dc3e:91ff:feff:21c3/64 scope link
root@Monitoring:~# apt update -y ; apt upgrade -y


root@Monitoring:~# wget https://download.checkmk.com/checkmk/2.0.0p3/check-mk-raw-2.0.0p3_0.buster_amd64.deb
--2021-04-25 16:30:48--  https://download.checkmk.com/checkmk/2.0.0p3/check-mk-raw-2.0.0p3_0.buster_amd64.deb
Resolving download.checkmk.com (download.checkmk.com)... 116.202.64.85
Connecting to download.checkmk.com (download.checkmk.com)|116.202.64.85|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 120673662 (115M) [application/x-debian-package]
Saving to: ‘check-mk-raw-2.0.0p3_0.buster_amd64.deb’

check-mk-raw-2.0.0p3_0.buster_amd64 100%[=================================================================>] 115.08M  4.60MB/s    in 26s

2021-04-25 16:31:14 (4.50 MB/s) - ‘check-mk-raw-2.0.0p3_0.buster_amd64.deb’ saved [120673662/120673662]

root@Monitoring:~# dpkg -i check-mk-raw-2.0.0p3_0.buster_amd64.deb
root@Monitoring:~# apt install -f 
root@Monitoring:~# dpkg -i check-mk-raw-2.0.0p3_0.buster_amd64.deb


root@Monitoring:~# omd version
OMD - Open Monitoring Distribution Version 2.0.0p3.cre
	
root@Monitoring:~# omd create -u 6100 -g 180 mysite
Adding /opt/omd/sites/mysite/tmp to /etc/fstab.
Creating temporary filesystem /omd/sites/mysite/tmp...OK
Updating core configuration...
Generating configuration for core (type nagios)...Precompiling host checks...OK
OK
Restarting Apache...OK
Created new site mysite with version 2.0.0p3.cre.

  The site can be started with omd start mysite.
  The default web UI is available at http://Monitoring/mysite/

  The admin user for the web applications is cmkadmin with password: CVnpP7xt
  For command line administration of the site, log in with 'omd su mysite'.
  After logging in, you can change the password for cmkadmin with 'htpasswd etc/htpasswd cmkadmin'.



root@Monitoring:~# su - mysite
OMD[mysite]:~$ omd start
Temporary filesystem already mounted
Starting mkeventd...OK
Starting rrdcached...OK
Starting npcd...OK
Starting nagios...OK
Starting apache...OK
Starting redis...OK
Initializing Crontab...OK

OMD[mysite]:~$ omd status
mkeventd:       running
rrdcached:      running
npcd:           running
nagios:         running
apache:         running
redis:          running
crontab:        running
-----------------------
Overall state:  running
	
OMD[mysite]:~$ omd config show
ADMIN_MAIL:
APACHE_MODE: own
APACHE_TCP_ADDR: 127.0.0.1
APACHE_TCP_PORT: 5000
AUTOSTART: on
CORE: nagios
LIVESTATUS_TCP: off
MKEVENTD: on
MKEVENTD_SNMPTRAP: off
MKEVENTD_SYSLOG: off
MKEVENTD_SYSLOG_TCP: off
MULTISITE_AUTHORISATION: on
MULTISITE_COOKIE_AUTH: on
NAGIOS_THEME: classicui
NSCA: off
PNP4NAGIOS: on
TMPFS: on



[ 10.0.0.10/16 ] [ /dev/pts/105 ] [~]
→ ssh root@10.0.0.101
root@10.0.0.101's password:
Linux home 4.19.0-16-amd64 #1 SMP Debian 4.19.181-1 (2021-03-19) x86_64

The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
Last login: Sun Apr 25 17:55:05 2021 from 10.0.0.10
root@home:~# cd /tmp
root@home:/tmp# wget http://10.0.0.201/mysite/check_mk/agents/check-mk-agent_2.0.0p3-1_all.deb
--2021-04-25 17:55:35--  http://10.0.0.201/mysite/check_mk/agents/check-mk-agent_2.0.0p3-1_all.deb
Connecting to 10.0.0.201:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 30166 (29K) [application/x-debian-package]
Saving to: ‘check-mk-agent_2.0.0p3-1_all.deb’

check-mk-agent_2.0.0p3-1_all.deb    100%[=================================================================>]  29.46K  --.-KB/s    in 0.001s

2021-04-25 17:55:35 (42.3 MB/s) - ‘check-mk-agent_2.0.0p3-1_all.deb’ saved [30166/30166]

root@home:/tmp# dpkg -i check-mk-agent_2.0.0p3-1_all.deb
Selecting previously unselected package check-mk-agent.
(Reading database ... 54845 files and directories currently installed.)
Preparing to unpack check-mk-agent_2.0.0p3-1_all.deb ...
Unpacking check-mk-agent (2.0.0p3-1) ...
Setting up check-mk-agent (2.0.0p3-1) ...
Enable Checkmk Agent in systemd...
Created symlink /etc/systemd/system/sockets.target.wants/check_mk.socket → /etc/systemd/system/check_mk.socket.

Adding a windows host:


root@Monitoring:~# ping 10.0.0.203
PING 10.0.0.203 (10.0.0.203) 56(84) bytes of data.
64 bytes from 10.0.0.203: icmp_seq=1 ttl=128 time=8.28 ms
64 bytes from 10.0.0.203: icmp_seq=2 ttl=128 time=0.718 ms
64 bytes from 10.0.0.203: icmp_seq=3 ttl=128 time=0.878 ms
64 bytes from 10.0.0.203: icmp_seq=4 ttl=128 time=11.3 ms
64 bytes from 10.0.0.203: icmp_seq=5 ttl=128 time=0.953 ms
64 bytes from 10.0.0.203: icmp_seq=6 ttl=128 time=10.5 ms

Here you can see that my Windows 10 VM has a few problems, and now i know them thanks to my checkmk instance. Now for a non-standard linux system like Arch Linux:


[ 10.0.0.10/16 ] [ /dev/pts/127 ] [~/Downloads]
→ ls -lash | grep check
 32K -rw-r--r--   1 nothing nothing  30K Apr 27 17:10 check-mk-agent_2.0.0p3-1_all
 56K -rw-r--r--   1 nothing nothing  56K Apr 27 18:46 check_mk_agent.linux
4.0K -rw-r--r--   1 nothing nothing  256 Apr 27 18:46 check_mk@.service
4.0K -rw-r--r--   1 nothing nothing  510 Apr 27 18:46 check_mk.socket

[ 10.0.0.10/16 ] [ /dev/pts/127 ] [~/Downloads]
→ sudo mv check_mk@.service /etc/systemd/system/                                                                                              
[sudo] password for nothing:

[ 10.0.0.10/16 ] [ /dev/pts/127 ] [~/Downloads]
→ sudo mv check_mk.socket /etc/systemd/system/ 

[ 10.0.0.10/16 ] [ /dev/pts/127 ] [~/Downloads]
→ sudo systemctl daemon-reload

[ 10.0.0.10/16 ] [ /dev/pts/127 ] [~/Downloads]
→ sudo mv check_mk_agent.linux /usr/bin/check_mk_agent

[ 10.0.0.10/16 ] [ /dev/pts/127 ] [~/Downloads]
→ chmod +x /usr/bin/check_mk_agent

[ 10.0.0.10/16 ] [ /dev/pts/130 ] [/etc/systemd/system]
→ systemctl enable --now check_mk.socket
==== AUTHENTICATING FOR org.freedesktop.systemd1.manage-units ====
Authentication is required to start 'check_mk.socket'.
Authenticating as: nothing
Password:
==== AUTHENTICATION COMPLETE ====
Created symlink /etc/systemd/system/sockets.target.wants/check_mk.socket → /etc/systemd/system/check_mk.socket.

[ 10.0.0.10/16 ] [ /dev/pts/130 ] [/etc/systemd/system]
→ systemctl status check_mk.socket
● check_mk.socket - Check_MK Agent Socket
     Loaded: loaded (/etc/systemd/system/check_mk.socket; disabled; vendor preset: disabled)
     Active: active (listening) since Tue 2021-04-27 18:55:53 CEST; 5s ago
     Listen: [::]:6556 (Stream)
   Accepted: 0; Connected: 0;
      Tasks: 0 (limit: 38425)
     Memory: 8.0K
        CPU: 542us
     CGroup: /system.slice/check_mk.socket

Apr 27 18:55:53 nowhere systemd[1]: Listening on Check_MK Agent Socket.

And then simply add the host itself to your checkmk instance just like we did previously.

CheckMK Setup

Initial Setup:

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