/centos8-vm-redis-sentinel-install

install redis - all three instances

dnf install @redis

systemctl start redis systemctl enable redis systemctl status redis

ss -ltpn | grep redis-server

configure master

sudo nano /etc/redis.conf

bind 0.0.0.0 protected-mode no supervised systemd requirepass Passw0rd! masterauth Passw0rd!

systemctl restart redis

configure replicas

sudo nano /etc/redis.conf

bind 0.0.0.0 protected-mode no supervised systemd requirepass Passw0rd! masterauth Passw0rd! replicaof 6379

systemctl restart redis

firewall settings - all three instances

firewall-cmd --zone=public --permanent --add-port=6379/tcp firewall-cmd --reload

redis-sentinel - all three instances

systemctl start redis-sentinel systemctl enable redis-sentinel systemctl status redis-sentinel

sudo nano /etc/redis-sentinel.conf

sentinel monitor mymaster 6379 2 sentinel auth-pass mymaster Passw0rd! sentinel down-after-milliseconds mymaster 5000 sentinel parallel-syncs mymaster 1 sentinel failover-timeout mymaster 60000

protected-mode no

systemctl restart redis-sentinel

firewall settings - all three instances

firewall-cmd --zone=public --permanent --add-port=26379/tcp firewall-cmd --reload

Check the Redis Sentinel Setup Status

redis-cli -p 26379 info sentinel

redis-cli -p 26379 sentinel master mymaster

redis-cli -p 26379 sentinel get-master-addr-by-name mymaster

test the failover

connect to master

systemctl stop redis