Differences between revisions 19 and 20
Revision 19 as of 2021-01-02 00:19:42
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Revision 20 as of 2021-01-02 01:25:07
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DISCLAIMER
THIS ONLY WORKS IN BUSTER
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 * 192.168.1.58 redis01
 * 192.168.1.59 redis02
 * 192.168.1.60 redis03
 * 192.168.1.59 redis01
 * 192.168.1.60 redis02
 * 192.168.1.61 redis03
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apt-get install redis-server redis-sentinel apt-get install redis-server
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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. Change the contents of the redis configuration file in `/etc/redis/redis.conf`.
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Add the IP-address for each of the servers. Each of the redis servers needs to listen on its own IP-address.
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Enable Redis to listen on the network
Enable redis to listen on the network, instead of only listening on the loopback device.
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Stop the redis server on all hosts. Redis stores its data in memory only, hence its speed. To make sure redis does not loose its state, in case of a hardware failure, this will enable it to store the state as it changed in a file on disk.
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service redis-server stop appendonly yes
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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`. Activate redis cluster features
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slaveof 192.168.1.58 6379 cluster-enabled yes
cluster-config-file nodes-6379.conf
cluster-node-timeout 15000
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Start the redis servers again, but start it on redis01 first. Restart the redis server on all hosts.
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service redis-server start
}}}
redis01 should now be the master.

=== Redis Sentinel ===

The same goes for `/etc/redis/sentinel.conf`
{{{
bind 127.0.0.1 192.168.1.58
service redis-server restart

DISCLAIMER THIS ONLY WORKS IN BUSTER 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.

  • 192.168.1.59 redis01
  • 192.168.1.60 redis02
  • 192.168.1.61 redis03

Software

apt-get install redis-server

Configuration

Redis Server

Change the contents of the redis configuration file in /etc/redis/redis.conf.

Add the IP-address for each of the servers. Each of the redis servers needs to listen on its own IP-address.

bind 127.0.0.1 192.168.1.58

Enable redis to listen on the network, instead of only listening on the loopback device.

protected-mode no

Redis stores its data in memory only, hence its speed. To make sure redis does not loose its state, in case of a hardware failure, this will enable it to store the state as it changed in a file on disk.

appendonly yes

Activate redis cluster features

cluster-enabled yes
cluster-config-file nodes-6379.conf
cluster-node-timeout 15000

Restart the redis server on all hosts.

service redis-server restart

References

None: Redis (last edited 2022-01-03 22:09:21 by Kristian Kallenberg)