Failed to start Apply Kernel Variables

Hello

I’m running Debian 8 (Jessie).

Last week I updated the server and got an error:

● systemd-sysctl.service - Apply Kernel Variables
   Loaded: loaded (/lib/systemd/system/systemd-sysctl.service; static)
   Active: failed (Result: exit-code) since Thu 2018-06-07 17:47:02 EEST; 2min 1s ago
     Docs: man:systemd-sysctl.service(8)
           man:sysctl.d(5)
  Process: 1907 ExecStart=/lib/systemd/systemd-sysctl (code=exited, status=1/FAILURE)
 Main PID: 1907 (code=exited, status=1/FAILURE)

Jun 07 17:47:02 kvm1.prado.lt systemd[1]: systemd-sysctl.service: main process exited, code=exited, status=1/FAILURE
Jun 07 17:47:02 kvm1.prado.lt systemd[1]: Failed to start Apply Kernel Variables.
Jun 07 17:47:02 kvm1.prado.lt systemd[1]: Unit systemd-sysctl.service entered failed state.

then, I checked that the journald daemon has collected by using the journalctl command

journalctl -xn
-- Logs begin at Thu 2018-04-19 01:13:40 EEST, end at Thu 2018-06-07 17:52:19 EEST. --
Jun 07 17:52:12 kvm1.prado.lt systemd-sysctl[2467]: Failed to write '262144' to '/proc/sys/vm/max_map_count': Permission denied
Jun 07 17:52:12 kvm1.prado.lt systemd[1]: systemd-sysctl.service: main process exited, code=exited, status=1/FAILURE
Jun 07 17:52:12 kvm1.prado.lt systemd[1]: Failed to start Apply Kernel Variables.
-- Subject: Unit systemd-sysctl.service has failed
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- 
-- Unit systemd-sysctl.service has failed.
-- 
-- The result is failed.
Jun 07 17:52:12 kvm1.prado.lt systemd[1]: Unit systemd-sysctl.service entered failed state.
Jun 07 17:52:19 kvm1.prado.lt systemd[1]: Starting Apply Kernel Variables...
-- Subject: Unit systemd-sysctl.service has begun with start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- 
-- Unit systemd-sysctl.service has begun starting up.
Jun 07 17:52:19 kvm1.prado.lt systemd[1]: Failed to reset devices.list on /system.slice/systemd-sysctl.service: No such file or directory
Jun 07 17:52:19 kvm1.prado.lt systemd-sysctl[2506]: Failed to write '262144' to '/proc/sys/vm/max_map_count': Permission denied
Jun 07 17:52:19 kvm1.prado.lt systemd[1]: systemd-sysctl.service: main process exited, code=exited, status=1/FAILURE
Jun 07 17:52:19 kvm1.prado.lt systemd[1]: Failed to start Apply Kernel Variables.
-- Subject: Unit systemd-sysctl.service has failed
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- 
-- Unit systemd-sysctl.service has failed.
-- 
-- The result is failed.
Jun 07 17:52:19 kvm1.prado.lt systemd[1]: Unit systemd-sysctl.service entered failed state.

To load all configuration files manually, execute

sysctl --system

Once the command has been successfully executed, I found where the problem is.

* Applying /etc/sysctl.d/99-sysctl.conf ...
* Applying /usr/lib/sysctl.d/elasticsearch.conf ...
sysctl: permission denied on key 'vm.max_map_count'
* Applying /etc/sysctl.conf ...

Now it’s time to open the file /usr/lib/sysctl.d/elasticsearch.conf where we will need to comment one line and problem should be solved.

We should change one line from

vm.max_map_count=262144

to

#vm.max_map_count=262144

Now we should to restart a service using the command

systemctl restart systemd-sysctl.service

And now we can make sure the service is up and running properly using the command

status systemd-sysctl.service
● systemd-sysctl.service - Apply Kernel Variables
   Loaded: loaded (/lib/systemd/system/systemd-sysctl.service; static)
   Active: active (exited) since Wed 2018-06-13 22:29:05 EEST; 5s ago
     Docs: man:systemd-sysctl.service(8)
           man:sysctl.d(5)
  Process: 31532 ExecStart=/lib/systemd/systemd-sysctl (code=exited, status=0/SUCCESS)
 Main PID: 31532 (code=exited, status=0/SUCCESS)

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