[BUG] KeyCloak K8s deployments may not be clustered

[przemyslavic]

Describe the bug
RabbitMQ/KeyCloak deployments do not seem to be clustered. After rescaling with command kubectl scale --replicas=xxx everything works fine. Probably some restart is needed for kubelet service.

To Reproduce
Deploy Epiphany cluster with RabbitMQ/KeyCloak applications configured to be clustered (replicas: 2 or more)
Use flannel CNI plugin

Expected behavior
Applications should be clustered, for example
kubectl logs rabbitmq-cluster-0 -n=queue should contain confirmation that RabbitMQ has N nodes in the cluster.

OS:

• OS: RHEL7

Cloud Environment:

• Cloud Provider: AWS

Additional context
See log in the comment below: #732 (comment)

[przemyslavic]

queue                  rabbitmq-cluster-0                                                          0/1     CrashLoopBackOff   17         68m
[ec2-user@ec2-35-181-49-111 ~]$ kubectl logs rabbitmq-cluster-0 -n=queue

  ##  ##
  ##  ##      RabbitMQ 3.7.10. Copyright (C) 2007-2018 Pivotal Software, Inc.
  ##########  Licensed under the MPL.  See http://www.rabbitmq.com/
  ######  ##
  ##########  Logs: <stdout>

              Starting broker...
2020-04-03 08:29:00.163 [info] <0.211.0>
 Starting RabbitMQ 3.7.10 on Erlang 21.2.3
 Copyright (C) 2007-2018 Pivotal Software, Inc.
 Licensed under the MPL.  See http://www.rabbitmq.com/
2020-04-03 08:29:00.168 [info] <0.211.0>
 node           : [email protected]
 home dir       : /var/lib/rabbitmq
 config file(s) : /etc/rabbitmq/rabbitmq.conf
 cookie hash    : LHdDZeqDJjd4t89pwS5zHg==
 log(s)         : <stdout>
 database dir   : /var/lib/rabbitmq/mnesia/[email protected]
2020-04-03 08:29:01.534 [info] <0.219.0> Memory high watermark set to 1864 MiB (1955366912 bytes) of 3729 MiB (3910733824 bytes) total
2020-04-03 08:29:01.538 [info] <0.221.0> Enabling free disk space monitoring
2020-04-03 08:29:01.538 [info] <0.221.0> Disk free limit set to 50MB
2020-04-03 08:29:01.541 [info] <0.224.0> Limiting to approx 1048476 file handles (943626 sockets)
2020-04-03 08:29:01.541 [info] <0.225.0> FHC read buffering:  OFF
2020-04-03 08:29:01.541 [info] <0.225.0> FHC write buffering: ON
2020-04-03 08:29:01.542 [info] <0.211.0> Node database directory at /var/lib/rabbitmq/mnesia/[email protected] is empty. Assuming we need to join an existing cluster or initialise from scratch...
2020-04-03 08:29:01.542 [info] <0.211.0> Configured peer discovery backend: rabbit_peer_discovery_k8s
2020-04-03 08:29:01.542 [info] <0.211.0> Will try to lock with peer discovery backend rabbit_peer_discovery_k8s
2020-04-03 08:29:01.542 [info] <0.211.0> Peer discovery backend does not support locking, falling back to randomized delay
2020-04-03 08:29:01.542 [info] <0.211.0> Peer discovery backend rabbit_peer_discovery_k8s does not support registration, skipping randomized startup delay.
2020-04-03 08:29:09.545 [info] <0.211.0> Failed to get nodes from k8s - {failed_connect,[{to_address,{"kubernetes.default.svc.cluster.local",443}},
                 {inet,[inet],nxdomain}]}
2020-04-03 08:29:09.545 [error] <0.210.0> CRASH REPORT Process <0.210.0> with 0 neighbours exited with reason: no case clause matching {error,"{failed_connect,[{to_address,{\"kubernetes.default.svc.cluster.local\",443}},\n
 {inet,[inet],nxdomain}]}"} in rabbit_mnesia:init_from_config/0 line 164 in application_master:init/4 line 138
2020-04-03 08:29:09.546 [info] <0.43.0> Application rabbit exited with reason: no case clause matching {error,"{failed_connect,[{to_address,{\"kubernetes.default.svc.cluster.local\",443}},\n                 {inet,[inet],nxdomain}]}"} in rabbit_mnesia:init_from_config/0 line 164
{"Kernel pid terminated",application_controller,"{application_start_failure,rabbit,{bad_return,{{rabbit,start,[normal,[]]},{'EXIT',{{case_clause,{error,\"{failed_connect,[{to_address,{\\"kubernetes.default.svc.cluster.local\\",443}},\n
              {inet,[inet],nxdomain}]}\"}},[{rabbit_mnesia,init_from_config,0,[{file,\"src/rabbit_mnesia.erl\"},{line,164}]},{rabbit_mnesia,init_with_lock,3,[{file,\"src/rabbit_mnesia.erl\"},{line,144}]},{rabbit_mnesia,init,0,[{file,\"src/rabbit_mnesia.erl\"},{line,111}]},{rabbit_boot_steps,'-run_step/2-lc$^1/1-1-',1,[{file,\"src/rabbit_boot_steps.erl\"},{line,49}]},{rabbit_boot_steps,run_step,2,[{file,\"src/rabbit_boot_steps.erl\"},{line,49}]},{rabbit_boot_steps,'-run_boot_steps/1-lc$^0/1-0-',1,[{file,\"src/rabbit_boot_steps.erl\"},{line,26}]},{rabbit_boot_steps,run_boot_steps,1,[{file,\"src/rabbit_boot_steps.erl\"},{line,26}]},{rabbit,start,2,[{file,\"src/rabbit.erl\"},{line,815}]}]}}}}}"}
Kernel pid terminated (application_controller) ({application_start_failure,rabbit,{bad_return,{{rabbit,start,[normal,[]]},{'EXIT',{{case_clause,{error,"{failed_connect,[{to_address,{\"kubernetes.defau

Crash dump is being written to: /var/log/rabbitmq/erl_crash.dump...done

[mkyc]

@przemyslavic can you update title and description of this bug? Title is saying about AWS/RedHat/flannel and description about RabbitMQ/KeyCloak. Can you describe in points what are you doing (steps to reproduce)?

[mkyc]

@to-bar @ar3ndt can you check if that is related to #1395

[mkyc]

RabbitMQ part is being handled in #1395

[sk4zuzu]

I've been trying to reproduce this issue for Keycloak for 2 days without any luck. We are not sure if this one is a real thing, because nobody recollects seeing it happen.

This is what I've been seeing consitently in logs (for 3 replicas in this case):

12:02:56,955 INFO  [org.infinispan.CLUSTER] (remote-thread--p13-t5) [Context=work] ISPN100010: Finished rebalance with members [as-testauthdb-0, as-testauthdb-1, as-testauthdb-2], topology id 7

We think it's possible it got "added" to the description of the RMQ issue by mistake.

The related RMQ issue #1395 is for sure real, which makes me think it's not really k8s related, but more of a something specific to RMQ itself.

Closing for now.