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| Redis is an in memory data structure storage. It will be used to share PHP-sessions between the apache servers. Three redis servers will be configured | Redis is an in memory data structure storage. It will be used to share PHP-sessions between the apache servers. To guarantee a robust deployment three redis servers will be configured. |
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| apt-get install redis-server | apt-get install redis-server redis-sentinel |
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| Guess we need to do some kind of configuration. | === Redis Server === Make sure the apache servers can reach redis. Change `bind 127.0.0.1` in `/etc/redis/redis.conf`. Each of the redis servers needs to listen on its own IP-address. {{{ bind 127.0.0.1 192.168.1.58 }}} Stop the redis server on all hosts. {{{ service redis-server stop }}} To enable replication we need to consider one of the redis servers the master. Here it will be redis01. On the two other hosts add the following to `/etc/redis/redis.conf`. {{{ slaveof 192.168.1.58 6379 }}} Start the redis servers again, but start it on redis03 first. {{{ service redis-server start }}} redis03 should now be the master. === Redis Sentinel === The same goes for `/etc/redis/sentinel.conf` {{{ bind 127.0.0.1 192.168.1.58 }}} |
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| * https://medium.com/@amila922/redis-sentinel-high-availability-everything-you-need-to-know-from-dev-to-prod-complete-guide-deb198e70ea6 |
INCOMPLETE DO NOT USE
Redis
Redis is an in memory data structure storage. It will be used to share PHP-sessions between the apache servers. To guarantee a robust deployment three redis servers will be configured.
- 192.168.1.58 redis01
- 192.168.1.59 redis02
- 192.168.1.60 redis03
Software
apt-get install redis-server redis-sentinel
Configuration
Redis Server
Make sure the apache servers can reach redis. Change bind 127.0.0.1 in /etc/redis/redis.conf. Each of the redis servers needs to listen on its own IP-address.
bind 127.0.0.1 192.168.1.58
Stop the redis server on all hosts.
service redis-server stop
To enable replication we need to consider one of the redis servers the master. Here it will be redis01. On the two other hosts add the following to /etc/redis/redis.conf.
slaveof 192.168.1.58 6379
Start the redis servers again, but start it on redis03 first.
service redis-server start
redis03 should now be the master.
Redis Sentinel
The same goes for /etc/redis/sentinel.conf
bind 127.0.0.1 192.168.1.58