Cannot Connect to Redis-compatible YEDIS API

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1. Are YugabyteDB processes running?

First, ensure that the expected YugabyteDB processes on the current node.At a minimum, the tserver process needs to be running to be able to connect to this node with a Redis client or application.Additionally, depending on the setup, you might expect a master process to also be running on this node.Follow the instructions on the Check Processes page.

2. Is YugabyteDB’s Redis-compatible YEDIS service running?

If the tserver process is running, make sure the the YEDIS service is enabled and listening on the Redis port (default 6379).

  1. $ lsof -i :6379
  1. COMMAND     PID   USER   FD   TYPE     DEVICE SIZE/OFF NODE NAME
  2. yb-tserve 81590 centos   92u  IPv4 0xdeadbeef      0t0  TCP localhost:6379 (LISTEN)

Note: You may need to install lsof first.

When running a local cluster with yb-ctl you should see all the nodes here with different IPs. For instance:

  1. $ lsof -i :6379
  1. COMMAND     PID   USER   FD   TYPE     DEVICE SIZE/OFF NODE NAME
  2. yb-tserve 81590 centos   92u  IPv4 0xdeadbeef      0t0  TCP localhost:6379 (LISTEN)
  3. yb-tserve 81593 centos   92u  IPv4 0xdeadbeef      0t0  TCP 127.0.0.2:6379 (LISTEN)
  4. yb-tserve 81596 centos   92u  IPv4 0xdeadbeef      0t0  TCP 127.0.0.3:6379 (LISTEN)

If there is another process using this port you might need to stop that and restart the tserver process.Otherwise, if no process is listening but the tserver is running, check the value of the —redis_proxy_bind_address flag passed to thetserver process.

3. Can the Redis CLI can connect locally?

Use redis-cli to connect to the local node.You may need to install redis-cli, otherwise you can find it in the Yugabyte bin directory).Try running:

  1. $ ./redis-cli -h <yb-local-address>

where <yb-local-address> is the address where the YEDIS service is listening (e.g. as returned by lsof). For instance, in the example above, it is localhost (or, additionally, 127.0.0.2 and 127.0.0.3 for the yb-ctl case).

If redis-cli can connect, the issue is likely a network issue with the original client not being able to access this node where YugabyteDB is running. See also Cannot access Master or TServer Endpoints below.Otherwise, you might need to run ./yb-admin —master_addresses <master-ip-addresses> setup_redis_table". You can find the yb-admin tool in the Yugabyte bin directory.