How to use Redis in a UNIX Socket

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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.

Stop Redis.
```
systemctl stop redis
```

Copy the service file.

cp /usr/lib/systemd/system/redis.service /etc/systemd/system/redis.service

Edit /etc/systemd/system/redis.service.
```
User=username
Group=username
```
Change username to same user that runs PHP.

Edit /etc/redis.conf and change the following:

unixsocket /path/to/redis.sock
unixsocketperm 770
logfile /path/to/redis.log
dir /path/to/redis

Change port to 0 if TCP socket is no longer needed.

Change owner of redis.conf to same username in step 3.
```
chown username:group /etc/redis.conf
```
If /path/to/redis directory does not exist, please manually create it, and make sure above mentioned socket path, log pathand dir path and are writable by the designated user.
Start Redis.
```
systemctl start redis
```
Verify it started successfully.
```
systemctl status redis
```
Check whether everything is working well.
```
nc -U /path/to/redis.sock
info
```

How to use Redis in a UNIX Socket

for Centos 7.X