Server Restart Sequence

When an installation employs memcached or the Messaging Server, it is important to follow this sequence when restarting servers:

<syntaxhighlight lang="bash" enclose="div">

1. STOP THE MESSAGING SERVER, if one is running:

/etc/init.d/messaging stop {hornetq-folder}/bin/stop.sh

1. STOP ALL APPLICATION SERVERS
2. On each server:

{appserver_files}/scripts/longjump stop ps aux | grep tomcat

  # If you see a Tomcat process running, kill it: 
    kill {tomcat_process_id}
  # Repeat until the system says "No such process"

1. STOP ALL memcached SERVERS
2. On each server:

/bin/memcached -d stop

1. START ALL memcached SERVERS
2. On each server:

/bin/memcached -d start -p {port_number} -u {user} -m {MB_of_memory}

  # Typical values:
  #    Port number: 11211, User: root, MB of memory: 25

1. START ALL APPLICATION SERVERS
2. On each server:

{appserver_files}/scripts/longjump start

1. START THE MESSAGING SERVER, if you're running one:

{hornetq-folder}/bin/start.sh /etc/init.d/messaging start </syntaxhighlight>

Considerations

• Stopping application servers ensures that they aren't adding entries to the cache.
• Stopping memcached makes sure that the cache is flushed.
• Those two steps can occur in either order. It is the next two for which order is critical:

• Restarting memcached first makes sure that a clean copy of the cache is available.
• When the application servers come up, they use the clean cache.