Localcheck: multi-line output not display in CheckMK

Troubleshooting
1

Hello,

I wrote a local check to read Linux updates (apt, yum, zypper, dnf). I would like to use a multi-line output like https://checkmk.com/cms_localchecks.html#Multi-line%20outputs

The script generates the following output as an example:

P Linux-Updates updates=2;5;10|sec_updates=2;1;3|Sources=2|Locks=0;3;5 2 Updates (kernel-uek-4.14.35-1902.10.8.el7uek.x86_64 kernel-uek-4.14.35-1902.8.4.el7uek.x86_64) \n2 Security Updates \n0 packets are locked \n2 used Paket-Sources

The local agent with this check generate in local-section following output:
<<<local>>>
...
P Linux-Updates updates=3;5;10|sec_updates=2;1;3|Sources=4|Locks=0;3;5 3 Updates (plugins: kernel-uek-4.14.35-1902.10.8.el7uek.x86_64 kernel-uek-4.14.35-1902.8.4.el7uek.x86_64) \n2 Security Updates \n0 packets are locked \n4 used Paket-Sources

P Linux-Updates updates=3;5;10|sec_updates=2;1;3|Sources=4|Locks=0;3;5 3 Updates (plugins: kernel-uek-4.14.35-1902.10.8.el7uek.x86_64 kernel-uek-4.14.35-1902.8.4.el7uek.x86_64) \n2 Security Updates \n0 packets are locked \n4 used Paket-Sources`

on the check-mk-server:
cmk -nv --debug --checks=local hostname

Check_MK version 1.6.0p7
+ FETCHING DATA
 [agent] Execute data source
 [piggyback] Execute data source
....
Linux-Updates        WARN - 3 Updates (plugins: kernel-uek-4.14.35-1902.10.8.el7uek.x86_64 kernel-uek-4.14.35-1902.8.4.el7uek.x86_64) 
OK - [agent] Version: 1.6.0p7, OS: linux, [piggyback] Successfully processed from source '...', execution time 6.9 sec | execution_time=6.943 user_time=0.100 system_time=0.000 children_user_time=0.000 children_system_time=0.000 cmk_time_agent=6.844

Why does checkmk ignore the output behind “\n”?

Edit: I use checkmk 1.6.0p7 Enterprise ; Agent versions are 1.6.0p7

best regards Tux

2

Look in the status GUI at the “long output of check plugin” line.

2 Likes
3

Are you aware that there are already official agent plugins at least for apt and zypper?

/opt/omd/sites/SITENAME/share/check_mk/agents/plugins/mk_apt
/opt/omd/sites/SITENAME/share/check_mk/agents/plugins/mk_zypper

But then, a unified approach for “Linux updates in general” surely is nice.

2 Likes
4

Exactly. And it is safe (yet unnecessary) to install both of them because they won’t output anything if zypper or apt-get isn’t installed on the host.

5

Hi,

i use this plugins, but these can’t yum and dnf. In addition, the plugins do not meet all my requirements and do not provide a uniform output (between apt and zypper).

6

Hi r.sander,

where do if find at GUI the “long output of check plugin”

7

i have find “long output of check plugin (multiline)”

see screnshot:

image
image987Ă—80 16.6 KB

we can i show this in normal view?

9

You could edit the view where you see the list of services and add the column for the long output.

10

Have you code the code so the output has 2 \ ?
Just checking, because when replying is also filter the backslash \\

root@linux# **/usr/lib/check_mk_agent/local/mycustomscript** 2 myservice - CRIT - This is my custom output\\nThis is some detailed information\\nAnd another line with details

11

@r.sander,

thanks for this idee. it works.

@sirbaas

Yes, i escape \ in the code.

12

i published my script to github