Memcached systemd file

vikelidiskostas

• January 22, 2018 21:47

Hello, I have installed memcached: [root@server ~]# rpm -qa |grep memcac ea-php56-php-memcached-2.2.0-1.4.119.cpanel.x86_64 libmemcached-1.0.18-1.3.4.cpanel.x86_64 ea-php56-php-memcache-2.2.7-1.3.118.cpanel.x86_64 ea-memcached-1.5.3-2.2.1.cpanel.x86_64
but occasionally after a cpanel update the unit file that starts the service: /etc/systemd/system/multi-user.target.wants/memcached.service
is overwritten. The correct unit files is this: [Unit] Description=Memcached Before=httpd.service After=network.target [Service] Type=simple EnvironmentFile=-/etc/sysconfig/memcached ExecStart=/usr/bin/memcached -u memcached -p $PORT -m $CACHESIZE -c $MAXCONN $OPTIONS [Install] WantedBy=multi-user.target
while the wrong one (the service is not started) is this: [Unit] Description=Memcached Before=httpd.service After=network.target [Service] Type=simple EnvironmentFile=-/etc/sysconfig/memcached ExecStart=/usr/bin/memcached -u $USER -p $PORT -m $CACHESIZE -c $MAXCONN $OPTIONS [Install] WantedBy=multi-user.target
It seems that the $USER variable is not available in the unit file. Any idea as why this happens?

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  cPanelMichael

  • January 23, 2018 16:31

  Hello, The /etc/systemd/system/multi-user.target.wants/memcached.service does not exist on a test CentOS 7 system when installing the Memcached via the EA4 experimental repo: # stat /etc/systemd/system/multi-user.target.wants/memcached.service stat: cannot stat "/etc/systemd/system/multi-user.target.wants/memcached.service": No such file or directory
  Instead, it uses the following file: /usr/lib/systemd/system/memcached.service
  To clarify, are you manually setting up the /etc/systemd/system/multi-user.target.wants/memcached.service file? Thank you.

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  vikelidiskostas

  • January 23, 2018 20:04

  This file: /etc/systemd/system/multi-user.target.wants/memcached.service
  is a link to: /usr/lib/systemd/system/memcached.service
  The truth is that the link is automatically created from systemd when you enable the service with the command: [root@server]# systemctl enable memcached.service Created symlink from /etc/systemd/system/multi-user.target.wants/memcached.service to /usr/lib/systemd/system/memcached.service.
  Do the same in your test system and you will see that the link will be created. So the problem is that each time a new version of ea-memcached package is installed it overwrites the /usr/lib/systemd/system/memcached.service file. More specific the problem is the $USER variable. When this variable is present the service is not started. When i replace the $USER variable with the "memcached" string (compare the unit files in my initial post) the service is successfully started.

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• 

  cPanelMichael

  • January 24, 2018 14:51

  Hello, The "$USER" variable should work, because it links to the following environment file: /etc/sysconfig/memcached
  Within this file, you should see an entry like this: USER="memcached"
  I left the default "$USER" entry in the /usr/lib/systemd/system/memcached.service file, and rebooted the system. Upon doing so, memcached was started successfully: Jan 24 09:50:03 cp70 systemd[1]: Starting Memcached... -- Subject: Unit memcached.service has begun start-up -- Defined-By: systemd -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel -- -- Unit memcached.service has begun starting up.
  What does the /etc/sysconfig/memcached file look like on your system? Thank you.

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  vikelidiskostas

  • January 25, 2018 04:19

  Thanks for the reply. I wasn't aware of the file: /etc/sysconfig/memcached
  The contents of this file in my system is this: user=memcached PORT=11211
  To solve the problem i have done the following: I restored the unit file /usr/lib/systemd/system/memcached.service in its original state and now it looks like this: [Unit] Description=Memcached Before=httpd.service After=network.target [Service] Type=simple EnvironmentFile=-/etc/sysconfig/memcached ExecStart=/usr/bin/memcached -u $USER -p $PORT -m $CACHESIZE -c $MAXCONN $OPTIONS [Install] WantedBy=multi-user.target
  Then i capitilized the variable's name in /etc/sysconfig/memcached. Now this file looks like this: USER=memcached PORT=11211
  Problem solved. The service is successfully started, restarted etc. Thanks for the help!!!

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