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⇤ ← Revision 3 as of 2020-02-11 21:55:22 →
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Editor: Kristian Kallenberg
Comment:
← Revision 32 as of 2021-01-04 21:34:44 → ⇥
Size: 4489
Editor: Kristian Kallenberg
Comment:
Deletions are marked like this. Additions are marked like this.
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INCOMPLETE DO NOT USE

= Redis =		 = Redis =
DISCLAIMER: This is running in Buster
Line 7: Line 6:
 * 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 apt-get install redis-server redis-sentinel
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Guess we need to do some kind of configuration. === Redis Server ===

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


= Redis Cluster =

As i by mistake configured this as a custer. this description will stay for a while. until then, the page will just be long

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 redis-sentinel
}}}

== 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. Due to a bug in redis, the added IP-address will have to be in the beginning of the line, right next to `bind`. If the IP-address is added in the end of the line, then the cluster will not initialize itself, and a `Waiting for the cluster to join...` message will continuously write dots.
{{{
bind 192.168.1.58 127.0.0.1 ::1
}}}


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 changes 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 redis on all hosts.
{{{
service redis-server restart
}}}

Next we will need to configure the servers to run as a cluster
{{{
redis-cli --cluster create 192.168.1.59:6379 192.168.1.60:6379 192.168.1.61:6379
}}}

You should get output similar to this
{{{
>>> Performing hash slots allocation on 3 nodes...
Master[0] -> Slots 0 - 5460
Master[1] -> Slots 5461 - 10922
Master[2] -> Slots 10923 - 16383
M: 78252519c58c5e7651554b3c82ba5800e4c11c41 192.168.1.59:6379
   slots:[0-5460] (5461 slots) master
M: b26d5a1ebe4891c68acf1d6b7cea5cc19057849f 192.168.1.60:6379
   slots:[5461-10922] (5462 slots) master
M: 0db96b401cca249b61660ed4d2945d658dcdc6e1 192.168.1.61:6379
   slots:[10923-16383] (5461 slots) master
Can I set the above configuration? (type 'yes' to accept): yes
>>> Nodes configuration updated
>>> Assign a different config epoch to each node
>>> Sending CLUSTER MEET messages to join the cluster
Waiting for the cluster to join

>>> Performing Cluster Check (using node 192.168.1.59:6379)
M: 78252519c58c5e7651554b3c82ba5800e4c11c41 192.168.1.59:6379
   slots:[0-5460] (5461 slots) master
M: 0db96b401cca249b61660ed4d2945d658dcdc6e1 192.168.1.61:6379
   slots:[10923-16383] (5461 slots) master
M: b26d5a1ebe4891c68acf1d6b7cea5cc19057849f 192.168.1.60:6379
   slots:[5461-10922] (5462 slots) master
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
}}}
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 * https://www.haproxy.com/blog/haproxy-advanced-redis-health-check/
 * https://medium.com/@amila922/redis-sentinel-high-availability-everything-you-need-to-know-from-dev-to-prod-complete-guide-deb198e70ea6
 * https://blog.usejournal.com/first-step-to-redis-cluster-7712e1c31847
 * https://www.linode.com/docs/applications/big-data/how-to-install-and-configure-a-redis-cluster-on-ubuntu-1604/
 * https://www.willandskill.se/en/setup-a-highly-available-redis-cluster-with-sentinel-and-haproxy/
 * https://www.tecmint.com/setup-redis-replication-in-centos-8/
 * https://www.tecmint.com/setup-redis-high-availability-with-sentinel-in-centos-8/
 * https://www.tecmint.com/setup-redis-cluster-in-centos-8/
 * https://stackoverflow.com/questions/39568561/how-to-solve-redis-cluster-waiting-for-the-cluster-to-join-issue

= Redis = DISCLAIMER: This is running in Buster

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 redis-sentinel

Configuration

Redis Server

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

Redis Cluster

As i by mistake configured this as a custer. this description will stay for a while. until then, the page will just be long

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 redis-sentinel

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. Due to a bug in redis, the added IP-address will have to be in the beginning of the line, right next to bind. If the IP-address is added in the end of the line, then the cluster will not initialize itself, and a Waiting for the cluster to join... message will continuously write dots. 

bind 192.168.1.58 127.0.0.1 ::1

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 changes 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 redis on all hosts. 

service redis-server restart

Next we will need to configure the servers to run as a cluster 

redis-cli --cluster create 192.168.1.59:6379 192.168.1.60:6379 192.168.1.61:6379

You should get output similar to this 

>>> Performing hash slots allocation on 3 nodes...
Master[0] -> Slots 0 - 5460
Master[1] -> Slots 5461 - 10922
Master[2] -> Slots 10923 - 16383
M: 78252519c58c5e7651554b3c82ba5800e4c11c41 192.168.1.59:6379
   slots:[0-5460] (5461 slots) master
M: b26d5a1ebe4891c68acf1d6b7cea5cc19057849f 192.168.1.60:6379
   slots:[5461-10922] (5462 slots) master
M: 0db96b401cca249b61660ed4d2945d658dcdc6e1 192.168.1.61:6379
   slots:[10923-16383] (5461 slots) master
Can I set the above configuration? (type 'yes' to accept): yes
>>> Nodes configuration updated
>>> Assign a different config epoch to each node
>>> Sending CLUSTER MEET messages to join the cluster
Waiting for the cluster to join

>>> Performing Cluster Check (using node 192.168.1.59:6379)
M: 78252519c58c5e7651554b3c82ba5800e4c11c41 192.168.1.59:6379
   slots:[0-5460] (5461 slots) master
M: 0db96b401cca249b61660ed4d2945d658dcdc6e1 192.168.1.61:6379
   slots:[10923-16383] (5461 slots) master
M: b26d5a1ebe4891c68acf1d6b7cea5cc19057849f 192.168.1.60:6379
   slots:[5461-10922] (5462 slots) master
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.

References

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