Error "psa dead but subsys locked" is shown when check status of Parallels Plesk Panel from the command line

Error "psa dead but subsys locked" is shown when check status of Parallels Plesk Panel from the command line

I get the following error when check status of Parallels Plesk Panel from the command line:

~# /etc/init.d/psa status
psa dead but subsys locked
~#

What does the error mean?

Cause

The error means that Parallels Plesk Panel is stopped but lock file exists.

Another way to check status of Parallels Plesk Panel is using command "netstat". Here is an example of correct output if Parallels Plesk Panel was running:

Parallels Plesk Panel version 7.x, 8.x

~# netstat -antp | grep 8443
tcp 0 0 0.0.0.0:8443 0.0.0.0:* LISTEN 9691/httpsd
~#

Parallels Plesk Panel version 9.x

~# netstat -antp | grep 8443
tcp 0 0 0.0.0.0:8443 0.0.0.0:* LISTEN 21856/sw-cp-serverd
~#

Here is result if Parallels Pleks Panel is not running:

~# netstat -antp | grep 8443
~#

Lock file of Parallels Plesk Panel on RedHat-like operating systems is /var/lock/subsys/psa.

Resolution

Remove file /var/lock/subsys/psa manually and start the service usual way:

~# rm -f /var/lock/subsys/psa
~# /etc/init.d/psa start1
Starting Plesk... done
~#

NOTE: Option "start1" allows to start only Parallels Panel Panel without other services.

Error log file is /usr/local/psa/admin/logs/httpsd_error_log for Parallels Plesk Panel version 7.x, 8.5 or /var/log/sw-cp-server/error_log for Parallels Plesk Panel version 9.x.