CODEWITHSUNDEEP
rediscluster-computingdevops
Hamza Saeed
Hamza Saeed

Reputation: 304

One command/script to find and flush all masters in Redis cluster

Can we run one command/script to find and flush all masters in Redis cluster? I am trying to run FLUSHALL on all masters in my cluster at once. Also whenever one of my master fails, slave of that failed master becomes Master. so when it changes to master, it should run FLUSHALL command. Are their any built-in functions to do this?

Upvotes: 1

Views: 786

Answers (2)

LeoMurillo
LeoMurillo

Reputation: 6774

Look at https://redis.io/commands/cluster-nodes and the related commands.

The output of CLUSTER NODES command is a space-separated CSV string, where each line represents a node in the cluster. The following is an example of output:

07c3...b91 127...1:30004@31004 slave e7d1eecce10fd6bb5eb35b9f99a514335d9ba9ca 0 1426238317239 4 connected
67ed...fa1 127...1:30002@31002 master - 0 1426238316232 2 connected 5461-10922
292f...f4f 127...1:30003@31003 master - 0 1426238318243 3 connected 10923-16383
6ec2...e01 127...1:30005@31005 slave 67ed2db8d677e59ec4a4cefb06858cf2a1a89fa1 0 1426238316232 5 connected
824f...ac3 127...1:30006@31006 slave 292f8b365bb7edb5e285caf0b7e6ddc7265d2f4f 0 1426238317741 6 connected
e7d1...9ca 127...1:30001@31001 myself,master - 0 0 1 connected 0-5460

Each line is composed of the following fields:

  • id
  • ip:port@cport
  • flags
  • master/slave
  • ping-sent
  • pong-recv
  • config-epoch
  • link-state
  • slot slot ... slot

So with this command, you find all masters (and slaves), by type on the fourth field.

You would need to implement a monitor service to detect when to trigger your FLUSHALL commands.

Upvotes: 0

Itamar Haber
Itamar Haber

Reputation: 50112

The redis-cli can do something like this with the following syntax:

redis-cli --cluster call 1.2.3.4:9876 flushall

Where the ip:port is one of your cluster's nodes. This will run the command on all nodes.

Upvotes: 1

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