when i use the cluster(just one master node),it has an error

[ayamzh]

I'm seeing this behaviour on

• OS: centos7
• Redis:
• PHP: 7.1.9
• phpredis: 3.1.6

mycode:
$redis = new \RedisCluster(NULL, ['127.0.0.1:6380']);

it will throw an exception
"Couldn't map cluster keyspace using any provided seed"

how to fix it

[michael-grunder]

Hi,

It's really hard to say. I connect to a single cluster node as a matter of practice when testing new functionality and it works just fine for me.

You can try to connect via redis-cli to see if the issue is actually in phpredis:
redis-cli -p 6380 -c

Then make sure you're actually running in cluster mode by doing something like this:
127.0.0.1:6380>cluster info

Make sure that cluster is actually enabled and that it's in an ok state.

[TTMikeK]

Same problem here (PHP 7.2, Redis 5.0.3, phpredis 4.2.0, on Ubuntu 18.04). INFO says redis_mode is cluster and cluster_enabled is 1.

[TTMikeK]

Mkay. My problem that caused the above error was I didn't create the cluster.

I expected phpcli --cluster create 127.0.0.1:6379 to work, but that's invalid. The workaround was to mass-assign the slots: for i in {0..16383}; do redis-cli -h 127.0.0.1 -p 6379 CLUSTER ADDSLOTS $i; done, but even with slots assigned it failed to work (different error, node complaining it can't connect to its peers ... which is true because it doesn't have any).

[michael-grunder]

Hey @TTSMike,

You don't need to do all of that. With a recent version of redis-server it's a lot easier to start up a cluster.

You can probably just use <phpredis_dir>/tests/make-cluster.sh along with redis-cli to get one up simply.

1. Run make-cluster.sh start
2. Run redis-cli --cluster create 127.0.0.1:7000 127.0.0.1:7001 127.0.0.1:7002 127.0.0.1:7003 127.0.0.1:7004 127.0.0.1:7005 127.0.0.1:7006 127.0.0.1:7007 127.0.0.1:7008 127.0.0.1:7009 127.0.0.1:7010 127.0.0.1:7011 127.0.0.1:7012 --cluster-replicas 3

https://asciinema.org/a/ADz6vxikqZQLts6QNJVY33XqN

[TTMikeK]

Cool, thanks for the tip. I was hoping to do it by hand initially just to better understand what was going on. Unfortunately that went badly so I aborted, and had to nuke my redis installation. I'll have to give that a try when I re-do our staging setup (I need to configure Live right now).

[michael-grunder]

OK good luck with your configuration.

Here's the simplest by hand approach to spinning up a cluster that I can think of:

 …/cluster-config $ for p in $(seq 7000 7003); do redis-server --cluster-enabled yes --save "" --port $p --cluster-config-file node-$p.conf --daemonize yes; done
 …/cluster-config $ redis-cli --cluster create 127.0.0.1:7000 127.0.0.1:7001 127.0.0.1:7002 --cluster-replicas 0

[TTMikeK]

Much appreciated. Thanks for all the tips. 😄

[michael-grunder]

I'm going to close this issue since it doesn't seem to be a bug in phpredis. Feel free to reopen if I'm misunderstanding.