Cannot use File Manager with cgroups service started: Cannot read property ‘show’ of undefined

Symptoms

• Cannot use File Manager with started cgroups service. Blank page is shown.

• Different errors appear while opening Domains > example.com > File Manager:

  PLESK_ERROR: Internal error ;-P
  TypeError: Cannot read property ‘show’ of undefined
  undefined

  OR

  PLESK_ERROR: Internal error ;-P
  TypeError: Cannot read property ‘hide’ of null
  undefined

• The following messages can be found in /var/log/plesk/panel.log:

  ERR [util_exec] proc_close() failed ['/opt/psa/admin/bin/filemng' 'jdoe' 'list' 'dirs' '/var/www/vhosts/example.com/httpdocs/wp-content' '--in-blocks'] with exit code [1]
   ERR [1] '/opt/psa/admin/bin/filemng' 'jdoe' 'list' 'dirs' '/var/www/vhosts/example.com/httpdocs/wp-content' '--in-blocks' failed with code 1.

  OR

  move process 7788 to cgroup for user testuser1 failed
   move_to_cgroup(): pam_open_session() failed 6: Permission denied

  OR

  Unable to open the directory: Unable to find the file /var/www/vhosts/example.com/httpdocs/css at the specified location

Cause

This is Plesk bug with ID #PPPM-6057. It will be fixed in future product updates.

Resolution

As a workaround, configure systemd limits via the following steps:

1. Connect to the server using SSH;

2. Uncomment and set DefaultStartLimitBurst=999 in /etc/systemd/system.conf:

   Before:

   ...
    [Manager]
    ...
    # DefaultStartLimitBurst=5
    ...

   After:

   ...
    [Manager]
    ...
    DefaultStartLimitBurst=999
    ...

3. Reload systemctl daemon:

   # systemctl daemon-reload

As another workaround, for each affected user create the file /etc/systemd/system/user-$userid.slice.d/51-StartLimit.conf which contains:

[Unit]
 StartLimitBurst=999

To determine $userid perform the following:

1. Login to Plesk > Subscriptions > example.com and determine system user for the subscription:

2. Connect to the server using SSH and execute:

   # grep johndoe /etc/passwd

   The output will be like:

   johndoe:x:10001:1003::/var/www/vhosts/example.com:/bin/false

   here 10001 is userid.

So, the correct path for config file should be:

/etc/systemd/system/user-10001.slice.d/51-StartLimit.conf