Redis instance running as background daemon (service)

Redis
Petr Kostelanský | 30 October 2017
In this article we are going to look at how create background process for Redis instance and make it automatic runnable after system start.
  1. Installation
  2. Redis instance running as background daemon
  3. Cluster configuration

We are going to create daemon to run Redis instance as background proccess. Daemon is something like service in Windows wolrd.

Redis as daemon under Ubuntu Linux

Let's look at what we need to configure.

Edit /etc/redis/redis-6379.conf file.

The name part ..6379.conf related with port numer under Redis instance running because we are going probably run more Redis instances and each instance need own config file. So we need distinguish those files.

Open config file in editor (open file by Nano editor)

sudo nano /etc/redis/redis-6379.conf

Changes in redis-6379.conf file

Check and set correct port

port 6379

Comment out binding IP address (to comment out use # hash)

# bind 127.0.0.1

Set protected-mode to no to allow connect to Redis instance remotely

protected-mode no

Find supervised directive and set it to systemd (systemd is linux daemon that start other daemons after system start and exit those daemons when system shutting down)

#   If you run Redis from upstart or systemd, Redis can interact with your
#   supervision tree. Options:
#   supervised no      - no supervision interaction
#   supervised upstart - signal upstart by putting Redis into SIGSTOP mode
#   supervised systemd - signal systemd by writing READY=1 to $NOTIFY_SOCKET
#   supervised auto    - detect upstart or systemd method based on
#                        UPSTART_JOB or NOTIFY_SOCKET environment variables
#   Note: these supervision methods only signal "process is ready."
#   They do not enable continuous liveness pings back to your supervisor.
supervised systemd
...

Rename pidfile

pidfile /var/run/redis1.pid

Next find dir and set /var/lib/redis/redis1

# The working directory.
#
# The DB will be written inside this directory, with the filename specified
# above using the 'dbfilename' configuration directive.
#
# The Append Only File will also be created inside this directory.
#
# Note that you must specify a directory here, not a file name.
dir /var/lib/redis/redis1
...

Create systemd file for Redis

Create systemd file in Nano editor

sudo nano /etc/systemd/system/redis1.service

Add text (service is going to be running under redis user)

[Unit]
Description=Redis Cache 1
After=network.target

[Service]
User=redis
Group=redis
ExecStart=/usr/local/bin/redis-server /etc/redis/redis-6379.conf
ExecStop=/usr/local/bin/redis-cli -p 6379 shutdown
Restart=always

[Install]
WantedBy=multi-user.target

Create redis user, groups and directories

sudo adduser --system --group --no-create-home redis   
sudo mkdir /var/lib/redis/redis1   # create directory
sudo chown redis:redis /var/lib/redis/redis1   # make redis own directory
sudo chmod 770 /var/lib/redis/redis1  # permission

Start Redis service

sudo systemctl start redis1

Check status

systemctl status redis

--- test redis instance---

Open Redis client and connect to running redis server

redis-cli -p 6379

Test connectivity from Redis client to Redis server

127.0.0.1:6379>ping

Exit Redis client

127.0.0.1:6379>exit

------

Restart Redis service

sudo systemctl restart redis1

Enable Redis to start after boot computer

sudo systemctl enable redis1

 

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