Plesk sw-engine service cannot be started on Linux container: Unable to allocate shared memory segment

Leonid Gukhman

Updated April 05, 2023 03:57

DoNotDelete:docref Plesk for Linux kb: technical ABT: Group A

Applicable to:

Plesk is installed inside a container and shows 502 Bad Gateway error.
On attempt to start 'sw-engine' service manually, the following error appears:

# service sw-engine start
Starting sw-engine-fpm: Fatal Error Unable to allocate shared memory segment of 104857600 bytes:
mmap: Cannot allocate memory (12) [FAILED]

The container has a lack of some UBC resources. For example, shmpages:

# cat /proc/user_beancounters
Version: 2.5 uid resource held maxheld barrier limit failcnt 10001:
shmpages 17604 17604 20480 20480 18

Click on a section to expand

Solution 1. Increase container limits

Connect to the hardware node via SSH
Increase the amount of the corresponding UBC limit for the container to at least 40960:

# vzctl set 10001 --shmpages 40960 --save

Note: If there is no access to the Hardware Node, contact service provider to increase the limit.

Solution 2. Decrease memory consumption

Connect to the server via SSH
Open /usr/local/psa/admin/conf/php.ini in any text editor and change the parameter (create if does not exist) opcache.memory_consumption from 100 to 64:

CONFIG_TEXT: opcache.memory_consumption=64