======How to use Redis in a UNIX Socket======

Please use root privilege to execute the following instructions.
If Redis fails to start, please verify SELinux is disabled , and all mentioned directories and files have correct permissions to the designated user.

=====for Centos 7.X=====

  - Stop Redis. <code>systemctl stop redis</code>
  - Copy the service file. <code>cp /usr/lib/systemd/system/redis.service /etc/systemd/system/redis.service</code>
  - Edit ''/etc/systemd/system/redis.service''. <code>User=username
Group=username</code> Change ''username'' to same user that runs PHP.
  - Edit ''/etc/redis.conf'' and change the following: <code>unixsocket /path/to/redis.sock
unixsocketperm 770
logfile /path/to/redis.log
dir /path/to/redis</code> Change **port** to ''0'' if TCP socket is no longer needed.
  - Change owner of redis.conf to same username in step 3. <code>chown username:group /etc/redis.conf</code> If ''/path/to/redis'' directory does not exist, please manually create it, and make sure above mentioned ''socket path'', ''log path''and ''dir path'' and are writable by the designated user.
  - Start Redis. <code>systemctl start redis</code>
  - Verify it started successfully. <code>systemctl status redis</code>
  - Check whether everything is working well. <code>nc -U /path/to/redis.sock
info</code>