REDIS

This page will walk you through

1. How to install,
2. Run/Stop/Restart
3. How to configure Redis with Sentinel
4. How to run it with systemd
5. How to upgrade to latest version
6. Uninstall Redis Server

1. How to install:

Ubuntu

``` sudo apt-get update sudo apt-get install build-essential tcl8.5 wget http://download.redis.io/releases/redis-stable.tar.gz tar xzvf redis-stable.tar.gz cd redis-stable make make test sudo make install cd utils sudo ./install_server.sh sudo service redis_6379 start ```

2. Start|Stop|Restart Redis:

You can start/stop/restart Redis in multiple ways, |ACTION|COMMAND| |–|–| |start| sudo service redis start
redis-server /path/to/redis.conf
/usr/local/bin/redis-server start
/etc/init.d/redis_6379 start
redis-server /usr/local/etc/redis/6379.conf start| |stop|sudo service redis stop
redis-cli shutdown
/usr/local/bin/redis-server stop
/etc/init.d/redis_6379 stop
redis-server /usr/local/etc/redis/6379.conf stop| |restart|sudo service redis restart
/usr/local/bin/redis-server start/stop/restart|

Check Redis is running:

ps aux | grep redis-server or sudo service redis_6379 status

Run redis as daemon: ` redis-server –daemonize yes`

Run Redis on different port: redis-server --port 6380

3. Run sentinel as service: This link will help you run Sentinel as a service

Passing arguments via the command line: redis-server --port 6380 --slaveof 127.0.0.1 6379

To remove old Sentinels from configurations: (Old sentinels are not removed from configuration. So, you have to manually edit your configurations) SENTINEL RESET mymaster

Returns list of master: ${SERVER_IP}:26379> sentinel slaves redis-cluster

Initiate failover:${SERVER_IP}:26379> sentinel master redis-cluster

Binding rules: You cannot have bind 127.0.0.1 123.123.123.123 but bind 123.123.123.123 127.0.0.1 in your sentinel.conf. sentinel auth-pass redis-01 password

How to upgrade to latest version

(this example is for upgrading redis 5.0.8 to redis 6.2.6 on Centos7)

To backup existing redis instance:

cd /usr/bin/
mv redis-benchmark redis-benchmark_v5 mv redis-check-aof redis-check-aof_v5 mv redis-check-rdb redis-check-rdb_v5 mv redis-cli redis-cli_v5 mv redis-sentinel redis-sentinel_v5 mv redis-server redis-server_v5
ln -sfn redis-server_v5 redis-check-aof_v5 ln -sfn redis-server_v5 redis-check-rdb_v5 ln -sfn redis-server_v5 redis-sentinel_v5

INSTALL WITH SOURCE: To Install the updated Redis:

yum install systemd-devel
wget http://download.redis.io/releases/redis-6.2.6.tar.gz
tar xzf redis-6.2.6.tar.gz
cd redis-6.2.6
make BUILD_WITH_SYSTEMD=yes USE_SYSTEMD=yes   #to make redis work with systemd
sudo cp /home/deploy/redis-6.2.6/src/{redis-cli,redis-check-rdb,redis-server,redis-sentinel,redis-check-aof,redis-benchmark,redis-trib.rb} /usr/bin/
systemctl restart redis
redis-server --version

WITH YUM: https://computingforgeeks.com/how-to-install-latest-redis-on-centos-7/

sudo yum -y install http://rpms.remirepo.net/enterprise/remi-release-7.rpm
sudo yum --enablerepo=remi list redis
sudo yum --enablerepo=remi install redis
redis-cli -p 26379 info

uninstall redis:

sudo -i
service redis-server stop
apt remove --purge redis-server
rm /var/lib/redis/dump.rdb
apt install redis-server
systemctl enable redis-server
service redis-server start

I have not tried, but it is possible this is enough

service redis-server stop
rm /var/lib/redis/dump.rdb
service redis-server start

Reference links:

standalone: redis sentinel high availability(medium)

how to install and use redis(digitalocean)

how to install and use redis(pivotal)

master-slave: Setup Redis master and slave(pivotal)

sentinel: master slave replication and redis sentinel(RTFM)

(This page is created by AATHITH(myself) for my self-reference only.)