Redis Notes - How to start a Redis server

Running Redis on Ubuntu 20.04
- Start, Stop and disable a system service in Ubuntu system
Running Redis on MacOS
Deploy Redis in Docker
References

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Running Redis on Ubuntu 20.04

Install Redis via apt tool.

sudo apt update
sudo apt install redis-server

Checking that the Redis service is running:

sudo systemctl status redis

If it is running without errors, the output will be like:

● redis-server.service - Advanced key-value store
    Loaded: loaded (/lib/systemd/system/redis-server.service; enabled; vendor preset: enable>
    Active: active (running) since Fri 2020-08-07 16:02:26 CST; 6min ago
      Docs: http://redis.io/documentation,
            man:redis-server(1)
    Process: 8982 ExecStart=/usr/bin/redis-server /etc/redis/redis.conf (code=exited, status=>
  Main PID: 8983 (redis-server)
      Tasks: 4 (limit: 3713)
    Memory: 2.9M
    CGroup: /system.slice/redis-server.service
            └─8983 /usr/bin/redis-server 127.0.0.1:6379

Connect to the server using redis-cli, the Redis command line interface:
```
redis-cli
```

Test connection with the ping command:

127.0.0.1:6379> ping
PONG

127.0.0.1:6379> set hello world
OK

127.0.0.1:6379> get hello
"world"

To shutdown the Redis server

Using redis-cli command to shutdown a Redis server is a relatively elegant way, this will save the data into RDB snapshot before the server shutdown, so you can get data back after the server rebooted.

redis-cli shutdown [save|nosave]

You will see the log of Redis outputs:

$ redis-cli shutdown

# the Redis server log output
74902:M 11 Oct 2020 19:10:06.457 # User requested shutdown...
74902:M 11 Oct 2020 19:10:06.458 * Saving the final RDB snapshot before exiting.
74902:M 11 Oct 2020 19:10:06.460 * DB saved on disk
74902:M 11 Oct 2020 19:10:06.460 # Redis is now ready to exit, bye bye...

Start, Stop and disable a system service in Ubuntu system

$ systemctl start redis
$ systemctl stop redis
$ systemctl restart redis

# Enable/disable the redis service at boot
$ systemctl enable redis
$ systemctl disable redis

Running Redis on MacOS

Install Redis via brew: brew install redis
To start a Redis server:
- Option 1. Run Redis server as service process:
```
brew services start redis
brew services stop redis
brew services restart redis
```
- Option 2. Run a Redis server and let output shows on terminal:
```
redis-server
```
  To shutdown a Redis server with redis-cli:
```
redis-cli shutdown
```

Deploy Redis in Docker

Pull the Redis image from Docker Hub, start a Redis instance based on Alpine Linux in background, and start listening TCP port 6379:

docker run -d --rm --name redis -p 6379:6379 redis:alpine

Test Redis through telnet command:

telnet 127.0.0.1 6379

The outputs will be like:

Trying 127.0.0.1...
Connected to 127.0.0.1.
Escape character is '^]'.

Note: Exit telnet interface by type in quit command.

And the Redis server is ready to go, test the connection by Redis ping command:

ping
+PONG

Stop the instance:

docker container stop redis

References

Redis.io

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