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Re: Slab Unreclaimable is continually growing

From Matthias Böttcher <matthias.boettcher@gmail.com>
Newsgroups linux.debian.user
Subject Re: Slab Unreclaimable is continually growing
Date 2019-07-27 12:00 +0200
Message-ID <yorEB-1DK-1@gated-at.bofh.it> (permalink)
References <ynsMp-4t4-1@gated-at.bofh.it> <ynvqV-6dM-1@gated-at.bofh.it> <yodBD-WI-9@gated-at.bofh.it> <yodV0-1jC-7@gated-at.bofh.it>
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On Fri, Jul 26, 2019 at 10:12:20PM +0300, Reco wrote:
> On Fri, Jul 26, 2019 at 08:55:19PM +0200, Matthias Böttcher wrote:

[...]

> > and additionally I stopped the socket for the Check_MK agent:
> > 
> >     sudo systemctl stop check_mk.socket
> 
> I do not know this one. What's its purpose? Monitoring, backup,
> something else? Is there a source available.

Checkmk, formerly Check_MK, is a monitoring software[1].
I am using the Checkmk Raw Edition (CRE) open-source.
Per default it gets data from an agent on a host with connect to 6556/tcp
every 60 seconds. All counters are fetched in one connect,
nothing is sent to the host. The agent for Linux is one big bash script[2].

The deb with the agent brings systemd integration:

--------------------------------------------
$ cat "/etc/systemd/system/check_mk@.service"

# systemd service definition file
[Unit]
Description=Check_MK

[Service]
ExecStart=/usr/bin/check_mk_agent
KillMode=process

User=root
Group=root

StandardInput=socket

--------------------------------------------
$ cat /etc/systemd/system/check_mk.socket

# systemd socket definition file
[Unit]
Description=Check_MK Agent Socket

[Socket]
ListenStream=6556
Accept=true

[Install]
WantedBy=sockets.target
--------------------------------------------

With check_mk.socket started, SUnreclaim and vm_area_struct are growing
endlessly. So I will investigate the checkmk agent.

> Reco

Reco, Thank you for your explanations and bumping me in the right direction.

Matthias

[1] https://checkmk.com/
[2] https://github.com/tribe29/checkmk/blob/master/agents/check_mk_agent.linux

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Thread

Slab Unreclaimable is continually growing Matthias Böttcher <matthias.boettcher@gmail.com> - 2019-07-24 19:00 +0200
  Re: Slab Unreclaimable is continually growing Shahryar Afifi <shahryarafifi@yahoo.com> - 2019-07-24 21:10 +0200
    Re: Slab Unreclaimable is continually growing Matthias Böttcher <matthias.boettcher@gmail.com> - 2019-07-26 20:10 +0200
  Re: Slab Unreclaimable is continually growing Reco <recoverym4n@enotuniq.net> - 2019-07-24 21:50 +0200
    Re: Slab Unreclaimable is continually growing Matthias Böttcher <matthias.boettcher@gmail.com> - 2019-07-26 21:00 +0200
      Re: Slab Unreclaimable is continually growing Reco <recoverym4n@enotuniq.net> - 2019-07-26 21:20 +0200
        Re: Slab Unreclaimable is continually growing Matthias Böttcher <matthias.boettcher@gmail.com> - 2019-07-27 12:00 +0200
          Re: Slab Unreclaimable is continually growing Matthias Böttcher <matthias.boettcher@gmail.com> - 2019-09-19 09:40 +0200

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