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I want to create a redis cluster with only specific redis hosts being master and slave. Also I want to assign from myself which host should be replica of which master.
Currently, cluster-create command creates a cluster when given a list of hostname:port parameters in any one of the redis masters. But this does not let us provide a custom config as we require. It suggests us with what is will create, and we can approve or cancel (not edit).

Is there any simple way of achieving what I intend to do?

Akash
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1 Answers1

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I figured out a good simple way myself.

Suppose we want to create the cluster as: 

A1-S1 
A2-S2
A3-S3

Where A is master and S are their corresponding slaves and this forms a single cluster. The steps would include.

  • Write into nodes.conf before starting the redis instances to append the desired slot hashes after the connected string. Make sure master and slave have the same slot hashes. Do this only for the line containing myself. This will look something like this:
Earlier:
a252d572140fd2b5410d4a63d051f1e6613cfd1f :6379@16379 myself,slave 0 0 0 connected

Final:
a252d572140fd2b5410d4a63d051f1e6613cfd1f :6379@16379 myself,slave 0 0 0 connected 0-5500

After this start the redis instances.

  • Now one by one do a cluster meet for each pair of master and slave. Do 3 cluster meet each for A1, A2 and A3 for their corresponding slaves. This connects the master and slave.
  • If by chance the master becomes a slave after a meet operation, do a cluster failover from the slave to make it the master.
  • Finally, run 2 more cluster meet for A1-A2 and A2-A3.

Doing this you get a cluster of the config you need.

Akash
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