Apache periodically down when docker is running: Can not restart web server

Symptoms

• Apache goes down after plesk repair web example.com -y is run with following error:

  # plesk repair web example.com
  
  Checking web server configuration 
  
  Repair web server configuration for domains example.com? [Y/n] y 
  Repairing web server configuration for the domain 
  example.com ...............................................
  [2020-09-22 14:41:22.557] ERR [util_exec] proc_close() failed ['/opt/psa/admin/bin/httpdmng' '--reconfigure-domain' example.com'] with exit code [1] 
  [FAILED] 
  - httpdmng failed:
  [2020-09-22 14:41:21.873] ERR [util_exec] 
  proc_close() failed 
  ['/opt/psa/admin/bin/apache_control_adapter' '--restart' 
  '--restart-interval' '0' '--http-port' '7080' '--https-port' 
  '7081'] with exit code [255] 
  [2020-09-22 14:41:22.359] ERR [panel] Apache config 
  (16007783440.36871400) generation failed: Template_Exception: 
  Can not restart web server: 
  file: /opt/psa/admin/plib/Service/Driver/Web/Server/Apache.php 
  line: 122 
  code: 0 
  Can not restart web server:
  
  Error messages: 0; Warnings: 0; Errors resolved: 0

• Another Apache webserver process is running:

  # ps auxwwff | grep -B2 apache
  root 1749 0.0 0.2 598104 39556 ? Ssl Sep29 0:05 /usr/bin/containerd
  root 7401 0.0 0.0 11788 5164 ? Sl Sep29 0:01 _ containerd-shim -namespace moby -workdir /var/lib/containerd/io.containerd.runtime.v1.linux/moby/00966c4ea498300fc454fc563a4869d0556fe94b2818898b0c6f2a03a6d9b0ec -address /run/containerd/containerd.sock -containerd-binary /usr/bin/containerd -runtime-root /var/run/docker/runtime-runc
  root 7826 0.0 0.1 83360 24708 ? Ss Sep29 0:01 _ apache2 -DFOREGROUND
  www-data 8250 0.0 0.0 83392 7228 ? S Sep29 0:00 _ apache2 -DFOREGROUND
  www-data 8251 0.0 0.0 83392 7228 ? S Sep29 0:00 _ apache2 -DFOREGROUND
  —
  plesk_s+ 14984 0.0 0.0 37084 4632 ? Ss 03:38 0:00 /lib/systemd/systemd –user
  plesk_s+ 14985 0.0 0.0 143988 2360 ? S 03:38 0:00 _ (sd-pam)
  root 20185 0.0 0.3 274624 51020 ? Ss 05:56 0:00 /usr/sbin/apache2 -k start
  www-data 20189 0.0 0.2 274540 43264 ? S 05:56 0:00 _ /usr/sbin/apache2 -k start

Cause

Software issue with ID #PPPM-12387 that will be resolved in future updates of the product.

Resolution

1. Connect to the server via SSH

2. Execute the following command:

   # sed -i -e ‘s|^(apache_status_linux_debian)|_1|g’ /opt/psa/admin/sbin/pleskrc

3. Restart Apache webserver