Solvedcharts [bitnami/redis] Sentinel cluster doesn't elect new master after master pod deletion

1275

Which chart:
Chart: bitnami/redis
Version: 13.0.1

Describe the bug
When a master pod is manually deleted, occasionally the remaining replicas appear to continue re-electing the nonexistent master. When the replacement pod reappears, it's unable to connect to the existing master as reported by the remaining replicas, which corresponds to the IP of the now nonexistent previous master pod.

To Reproduce
I'm not able to deterministically reproduce the behavior described above. I'd say the errant behavior occurs ~20% of the time.

Steps to reproduce the behavior:

Create a sentinel cluster with the values below and wait for it to come online
Determine which pod is master and delete it
(with some probability) the replacement pod can't start redis because it can't connect to the master IP reported by the remaining sentinels because they still think the IP of the now deleted pod is still master

Expected behavior
When a pod is deleted the cluster members should elect a new master among themselves and the replacement pod should be able to connect to the elected master when the replacement comes online.

Version of Helm and Kubernetes:

Output of helm version:

version.BuildInfo{Version:"v3.4.0", GitCommit:"7090a89efc8a18f3d8178bf47d2462450349a004", GitTreeState:"clean", GoVersion:"go1.14.10"}

Output of kubectl version:

Client Version: version.Info{Major:"1", Minor:"15", GitVersion:"v1.15.11", GitCommit:"d94a81c724ea8e1ccc9002d89b7fe81d58f89ede", GitTreeState:"clean", BuildDate:"2020-03-12T21:08:59Z", GoVersion:"go1.12.17", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"18", GitVersion:"v1.18.15", GitCommit:"73dd5c840662bb066a146d0871216333181f4b64", GitTreeState:"clean", BuildDate:"2021-01-13T13:14:05Z", GoVersion:"go1.13.15", Compiler:"gc", Platform:"linux/amd64"}

Additional context

values

## Bitnami Redis(TM) image version
## ref: https://hub.docker.com/r/bitnami/redis/tags/
##
image:
  registry: docker.io
  repository: bitnami/redis
  ## Bitnami Redis(TM) image tag
  ## ref: https://github.com/bitnami/bitnami-docker-redis#supported-tags-and-respective-dockerfile-links
  ##
  tag: "6.2.1-debian-10-r36"
  ## Specify a imagePullPolicy
  ## Defaults to 'Always' if image tag is 'latest', else set to 'IfNotPresent'
  ## ref: http://kubernetes.io/docs/user-guide/images/#pre-pulling-images
  ##
  pullPolicy: IfNotPresent

## Cluster settings
##
cluster:
  enabled: true
  slaveCount: 3

## Use redis sentinel in the redis pod. This will disable the master and slave services and
## create one redis service with ports to the sentinel and the redis instances
##
sentinel:
  enabled: true
  ## Require password authentication on the sentinel itself
  ## ref: https://redis.io/topics/sentinel
  ##
  usePassword: true
  ## Bitnami Redis(TM) Sentintel image version
  ## ref: https://hub.docker.com/r/bitnami/redis-sentinel/tags/
  ##
  image:
    registry: docker.io
    repository: bitnami/redis-sentinel
    ## Bitnami Redis(TM) image tag
    ## ref: https://github.com/bitnami/bitnami-docker-redis-sentinel#supported-tags-and-respective-dockerfile-links
    ##
    tag: "6.2.1-debian-10-r35"
    ## Specify a imagePullPolicy
    ## Defaults to 'Always' if image tag is 'latest', else set to 'IfNotPresent'
    ## ref: http://kubernetes.io/docs/user-guide/images/#pre-pulling-images
    ##
    pullPolicy: IfNotPresent

## Use password authentication
##
usePassword: true
## Redis(TM) password (both master and slave)
## Defaults to a random 10-character alphanumeric string if not set and usePassword is true
## ref: https://github.com/bitnami/bitnami-docker-redis#setting-the-server-password-on-first-run
##
password: "password"

##
## Redis(TM) Master parameters
##
master:
  ## Comma-separated list of Redis(TM) commands to disable
  ##
  ## Can be used to disable Redis(TM) commands for security reasons.
  ## Commands will be completely disabled by renaming each to an empty string.
  ## ref: https://redis.io/topics/security#disabling-of-specific-commands
  ##
  disableCommands:
  # - FLUSHDB
  # - FLUSHALL

  ## Redis(TM) Master additional pod labels and annotations
  ## ref: https://kubernetes.io/docs/concepts/overview/working-with-objects/labels/
  ##
  podLabels: {}
  podAnnotations:
    # Datadog redis metrics autodiscovery
    # See: https://docs.datadoghq.com/agent/kubernetes/integrations/?tab=kubernetes#datadog-redis-integration
    ad.datadoghq.com/redis.check_names: '["redisdb"]'
    ad.datadoghq.com/redis.init_configs: '[{}]'
    ad.datadoghq.com/redis.instances: |
      [
        {
          "host": "%%host%%",
          "port":"6379",
          "password":"{{ .Values.secrets.rms.cache.backend_config.password }}"
        }
      ]

  ## Redis(TM) Master resource requests and limits
  ## ref: http://kubernetes.io/docs/user-guide/compute-resources/
  resources:
    requests:
      memory: 512Mi
      cpu: 300m
    limits:
      memory: 1024Mi
      cpu: 600m

  ## Enable persistence using Persistent Volume Claims
  ## ref: http://kubernetes.io/docs/user-guide/persistent-volumes/
  ##
  persistence:
    enabled: false

##
## Redis(TM) Slave properties
## Note: service.type is a mandatory parameter
## The rest of the parameters are either optional or, if undefined, will inherit those declared in Redis(TM) Master
##
slave:
  ## List of Redis(TM) commands to disable
  ##
  disableCommands:
  # - FLUSHDB
  # - FLUSHALL

  ## Redis(TM) slave Resource
  resources:
    requests:
      memory: 512Mi
      cpu: 300m
    limits:
      memory: 1024Mi
      cpu: 600m

  podAnnotations:
    # Datadog redis metrics autodiscovery
    # See: https://docs.datadoghq.com/agent/kubernetes/integrations/?tab=kubernetes#datadog-redis-integration
    ad.datadoghq.com/redis.check_names: '["redisdb"]'
    ad.datadoghq.com/redis.init_configs: '[{}]'
    ad.datadoghq.com/redis.instances: |
      [
        {
          "host": "%%host%%",
          "port":"6379",
          "password":"{{ .Values.secrets.rms.cache.backend_config.password }}"
        }
      ]

  ## Enable persistence using Persistent Volume Claims
  ## ref: http://kubernetes.io/docs/user-guide/persistent-volumes/
  ##
  persistence:
    enabled: false

## Sysctl InitContainer
## used to perform sysctl operation to modify Kernel settings (needed sometimes to avoid warnings)
##
sysctlImage:
  enabled: true
  command:
    - /bin/sh
    - -c
    - |-
      sysctl -w net.core.somaxconn=10000
      echo never > /host-sys/kernel/mm/transparent_hugepage/enabled
  registry: docker.io
  repository: bitnami/bitnami-shell
  tag: "10"
  pullPolicy: Always
  mountHostSys: true

installation command

helm install redis . -f custom-values.yaml  --atomic --namespace redis-test

cluster log output

The output below occurs on an otherwise healthy sentinel cluster after I run kubectl delete pod redis-node-2 (please note: the logging is collected via stern which I believe explains the unexpected error: stream error: stream ID 19; INTERNAL_ERROR occurrences).

redis-node-2 redis 1:signal-handler (1618955501) Received SIGTERM scheduling shutdown...
redis-node-2 redis 1:M 20 Apr 2021 21:51:41.945 # User requested shutdown...
redis-node-2 redis 1:M 20 Apr 2021 21:51:41.945 * Calling fsync() on the AOF file.
redis-node-2 redis 1:M 20 Apr 2021 21:51:41.945 # Redis is now ready to exit, bye bye...
redis-node-2 sentinel 1:X 20 Apr 2021 21:51:41.949 # Executing user requested FAILOVER of 'mymaster'
redis-node-2 sentinel 1:X 20 Apr 2021 21:51:41.949 # +new-epoch 6
redis-node-2 sentinel 1:X 20 Apr 2021 21:51:41.949 # +try-failover master mymaster 10.42.12.213 6379
redis-node-1 redis 1:S 20 Apr 2021 21:51:41.954 # Connection with master lost.
redis-node-1 redis 1:S 20 Apr 2021 21:51:41.954 * Caching the disconnected master state.
redis-node-1 redis 1:S 20 Apr 2021 21:51:41.954 * Reconnecting to MASTER 10.42.12.213:6379
redis-node-1 redis 1:S 20 Apr 2021 21:51:41.954 * MASTER <-> REPLICA sync started
redis-node-1 redis 1:S 20 Apr 2021 21:51:41.955 # Error condition on socket for SYNC: Connection refused
redis-node-0 redis 1:S 20 Apr 2021 21:51:41.952 # Connection with master lost.
redis-node-0 redis 1:S 20 Apr 2021 21:51:41.952 * Caching the disconnected master state.
redis-node-0 redis 1:S 20 Apr 2021 21:51:41.952 * Reconnecting to MASTER 10.42.12.213:6379
redis-node-0 redis 1:S 20 Apr 2021 21:51:41.952 * MASTER <-> REPLICA sync started
redis-node-0 redis 1:S 20 Apr 2021 21:51:41.953 # Error condition on socket for SYNC: Connection refused
redis-node-2 sentinel 1:X 20 Apr 2021 21:51:41.993 # +vote-for-leader bc33c65f6d573da2c50da570ccf4dc629a32426d 6
redis-node-2 sentinel 1:X 20 Apr 2021 21:51:41.993 # +elected-leader master mymaster 10.42.12.213 6379
redis-node-2 sentinel 1:X 20 Apr 2021 21:51:41.993 # +failover-state-select-slave master mymaster 10.42.12.213 6379
redis-node-2 sentinel 1:X 20 Apr 2021 21:51:42.054 # +selected-slave slave 10.42.9.18:6379 10.42.9.18 6379 @ mymaster 10.42.12.213 6379
redis-node-2 sentinel 1:X 20 Apr 2021 21:51:42.054 * +failover-state-send-slaveof-noone slave 10.42.9.18:6379 10.42.9.18 6379 @ mymaster 10.42.12.213 6379
redis-node-2 sentinel 1:signal-handler (1618955502) Received SIGTERM scheduling shutdown...
redis-node-2 sentinel 1:X 20 Apr 2021 21:51:42.121 # User requested shutdown...
redis-node-2 sentinel 1:X 20 Apr 2021 21:51:42.121 # Sentinel is now ready to exit, bye bye...
redis-node-0 redis 1:S 20 Apr 2021 21:51:42.175 * Connecting to MASTER 10.42.12.213:6379
redis-node-0 redis 1:S 20 Apr 2021 21:51:42.175 * MASTER <-> REPLICA sync started
redis-node-0 redis 1:S 20 Apr 2021 21:51:42.177 # Error condition on socket for SYNC: Connection refused
redis-node-1 redis 1:S 20 Apr 2021 21:51:42.310 * Connecting to MASTER 10.42.12.213:6379
redis-node-1 redis 1:S 20 Apr 2021 21:51:42.310 * MASTER <-> REPLICA sync started
redis-node-1 redis 1:S 20 Apr 2021 21:51:42.312 # Error condition on socket for SYNC: Connection refused
- redis-node-2 › redis
- redis-node-2 › sentinel
redis-node-0 redis 1:S 20 Apr 2021 21:51:43.185 * Connecting to MASTER 10.42.12.213:6379
redis-node-0 redis 1:S 20 Apr 2021 21:51:43.185 * MASTER <-> REPLICA sync started
redis-node-1 redis 1:S 20 Apr 2021 21:51:43.328 * Connecting to MASTER 10.42.12.213:6379
redis-node-1 redis 1:S 20 Apr 2021 21:51:43.328 * MASTER <-> REPLICA sync started
redis-node-1 sentinel 1:X 20 Apr 2021 21:51:52.310 # +reset-master master mymaster 10.42.12.213 6379
+ redis-node-2 › sentinel
+ redis-node-2 › redis
redis-node-2 sentinel  21:51:52.24 INFO  ==> redis-headless.redis-test.svc.cluster.local has my IP: 10.42.12.214
redis-node-2 sentinel  21:51:52.29 INFO  ==> Cleaning sentinels in sentinel node: 10.42.9.18
redis-node-2 sentinel Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
redis-node-2 sentinel 1
redis-node-2 redis  21:51:51.92 INFO  ==> redis-headless.redis-test.svc.cluster.local has my IP: 10.42.12.214
redis-node-2 redis Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
redis-node-2 redis Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
redis-node-1 sentinel 1:X 20 Apr 2021 21:51:53.211 * +sentinel sentinel b942a249aa6aaca842ead4ff6ad2fd01cdd6797b 10.42.16.216 26379 @ mymaster 10.42.12.213 6379
redis-node-0 sentinel 1:X 20 Apr 2021 21:51:57.322 # +reset-master master mymaster 10.42.12.213 6379
redis-node-2 sentinel  21:51:57.31 INFO  ==> Cleaning sentinels in sentinel node: 10.42.16.216
redis-node-2 sentinel Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
redis-node-2 sentinel 1
redis-node-0 sentinel 1:X 20 Apr 2021 21:51:59.379 * +sentinel sentinel 11f8f53ef3e904a0cfe2822709d6d6ca611daaf6 10.42.9.18 26379 @ mymaster 10.42.12.213 6379
redis-node-2 sentinel  21:52:02.32 INFO  ==> Sentinels clean up done
redis-node-2 sentinel Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
redis-node-2 sentinel Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
redis-node-1 sentinel 1:X 20 Apr 2021 21:52:12.350 # +sdown master mymaster 10.42.12.213 6379
redis-node-0 sentinel 1:X 20 Apr 2021 21:52:17.333 # +sdown master mymaster 10.42.12.213 6379
redis-node-0 sentinel 1:X 20 Apr 2021 21:52:17.388 # +odown master mymaster 10.42.12.213 6379 #quorum 2/2
redis-node-0 sentinel 1:X 20 Apr 2021 21:52:17.388 # +new-epoch 6
redis-node-0 sentinel 1:X 20 Apr 2021 21:52:17.388 # +try-failover master mymaster 10.42.12.213 6379
redis-node-0 sentinel 1:X 20 Apr 2021 21:52:17.397 # +vote-for-leader b942a249aa6aaca842ead4ff6ad2fd01cdd6797b 6
redis-node-1 sentinel 1:X 20 Apr 2021 21:52:17.407 # +new-epoch 6
redis-node-0 sentinel 1:X 20 Apr 2021 21:52:17.420 # 11f8f53ef3e904a0cfe2822709d6d6ca611daaf6 voted for b942a249aa6aaca842ead4ff6ad2fd01cdd6797b 6
redis-node-1 sentinel 1:X 20 Apr 2021 21:52:17.422 # +vote-for-leader b942a249aa6aaca842ead4ff6ad2fd01cdd6797b 6
redis-node-0 sentinel 1:X 20 Apr 2021 21:52:17.480 # +elected-leader master mymaster 10.42.12.213 6379
redis-node-0 sentinel 1:X 20 Apr 2021 21:52:17.480 # +failover-state-select-slave master mymaster 10.42.12.213 6379
redis-node-0 sentinel 1:X 20 Apr 2021 21:52:17.556 # -failover-abort-no-good-slave master mymaster 10.42.12.213 6379
redis-node-0 sentinel 1:X 20 Apr 2021 21:52:17.623 # Next failover delay: I will not start a failover before Tue Apr 20 21:52:54 2021
redis-node-1 sentinel 1:X 20 Apr 2021 21:52:17.716 # +odown master mymaster 10.42.12.213 6379 #quorum 2/2
redis-node-1 sentinel 1:X 20 Apr 2021 21:52:17.716 # Next failover delay: I will not start a failover before Tue Apr 20 21:52:53 2021
unexpected error: stream error: stream ID 19; INTERNAL_ERROR
unexpected error: stream error: stream ID 29; INTERNAL_ERROR
redis-node-1 sentinel 1:X 20 Apr 2021 21:52:49.303 # +reset-master master mymaster 10.42.12.213 6379
redis-node-0 sentinel 1:X 20 Apr 2021 21:52:49.700 # -odown master mymaster 10.42.12.213 6379
redis-node-1 sentinel 1:X 20 Apr 2021 21:52:50.232 * +sentinel sentinel b942a249aa6aaca842ead4ff6ad2fd01cdd6797b 10.42.16.216 26379 @ mymaster 10.42.12.213 6379
redis-node-0 sentinel 1:X 20 Apr 2021 21:52:54.314 # +reset-master master mymaster 10.42.12.213 6379
unexpected error: stream error: stream ID 33; INTERNAL_ERROR
redis-node-0 sentinel 1:X 20 Apr 2021 21:52:54.329 * +sentinel sentinel 11f8f53ef3e904a0cfe2822709d6d6ca611daaf6 10.42.9.18 26379 @ mymaster 10.42.12.213 6379
redis-node-1 sentinel 1:X 20 Apr 2021 21:53:09.384 # +sdown master mymaster 10.42.12.213 6379
redis-node-0 sentinel 1:X 20 Apr 2021 21:53:14.328 # +sdown master mymaster 10.42.12.213 6379
redis-node-0 sentinel 1:X 20 Apr 2021 21:53:14.411 # +odown master mymaster 10.42.12.213 6379 #quorum 2/2
redis-node-0 sentinel 1:X 20 Apr 2021 21:53:14.411 # +new-epoch 7
redis-node-0 sentinel 1:X 20 Apr 2021 21:53:14.411 # +try-failover master mymaster 10.42.12.213 6379
redis-node-0 sentinel 1:X 20 Apr 2021 21:53:14.422 # +vote-for-leader b942a249aa6aaca842ead4ff6ad2fd01cdd6797b 7
redis-node-1 sentinel 1:X 20 Apr 2021 21:53:14.437 # +new-epoch 7
redis-node-1 sentinel 1:X 20 Apr 2021 21:53:14.450 # +vote-for-leader b942a249aa6aaca842ead4ff6ad2fd01cdd6797b 7
redis-node-0 sentinel 1:X 20 Apr 2021 21:53:14.448 # 11f8f53ef3e904a0cfe2822709d6d6ca611daaf6 voted for b942a249aa6aaca842ead4ff6ad2fd01cdd6797b 7
redis-node-0 sentinel 1:X 20 Apr 2021 21:53:14.488 # +elected-leader master mymaster 10.42.12.213 6379
redis-node-0 sentinel 1:X 20 Apr 2021 21:53:14.488 # +failover-state-select-slave master mymaster 10.42.12.213 6379
redis-node-0 sentinel 1:X 20 Apr 2021 21:53:14.550 # -failover-abort-no-good-slave master mymaster 10.42.12.213 6379
redis-node-0 sentinel 1:X 20 Apr 2021 21:53:14.640 # Next failover delay: I will not start a failover before Tue Apr 20 21:53:51 2021
redis-node-1 sentinel 1:X 20 Apr 2021 21:53:14.695 # +odown master mymaster 10.42.12.213 6379 #quorum 2/2
redis-node-1 sentinel 1:X 20 Apr 2021 21:53:14.695 # Next failover delay: I will not start a failover before Tue Apr 20 21:53:51 2021
- redis-node-2 › redis
- redis-node-2 › sentinel
+ redis-node-2 › sentinel
+ redis-node-2 › redis

30 Answers

Original

✔️Accepted Answer

bluecrabs007

Mitigation: We've been able to mitigate this issue by reducing sentinel.downAfterMilliseconds and sentinel.failoverTimeout to beat the pod restart delay.

Looks like this works, I was able to workaround the issue by setting these two config options to

-  downAfterMilliseconds: 60000
-  failoverTimeout: 18000
+  downAfterMilliseconds: 4000
+  failoverTimeout: 2000

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I get the same error message with our SonarQube chart for OpenShift The same install works with Helm...

helm charts prometheus-kube-stack unknown fields probenamespaceselector and probeSelector

Can you try to delete the crds before retrying to install the chart? See https://github.com/promethe...

charts [stable/nginx-ingress] toYaml can't render configmap with booleans

same here :( I was able to make it work (fix) by using --set-string For example: ...

helm Secret Management in Helm

The method proposed above does not seem like it would work with helm rollback or simple helm upgrade...

helm Helm 2.2.3 not working properly with kubeadm 1.6.1 default RBAC rules

After running helm init When installing a cluster for the first time using kubeadm v1.6.1 the initia...

helm helm cant upgrade already created resources

For the benefit of the group I am using helm 2.9.1 and I want to create a namespace with an annotati...

Solvedcharts [bitnami/redis] Sentinel cluster doesn't elect new master after master pod deletion

values

installation command

cluster log output

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