如何使用 Helm 将额外的配置传递给 RabbitMQ？

Question

我正在使用此图表：https://github.com/helm/charts/tree/master/stable/rabbitmq 在 Kubernetes 上部署一个由 3 个 RabbitMQ 节点组成的集群。我的目的是将所有队列镜像到集群中的 2 个节点内。

这是我用来运行 Helm 的命令：helm install --name rabbitmq-local -f rabbitmq-values.yaml stable/rabbitmq

这是rabbitmq-values.yaml的内容：

persistence:
  enabled: true

resources:
  requests:
    memory: 256Mi
    cpu: 100m

replicas: 3

rabbitmq:
  extraConfiguration: |-
    {
      "policies": [
        {
          "name": "queue-mirroring-exactly-two",
          "pattern": "^ha\.",
          "vhost": "/",
          "definition": {
            "ha-mode": "exactly",
            "ha-params": 2
          }
        }
      ]
    }

但是，由于某些解析错误，节点无法启动，并且它们处于崩溃循环中。这是kubectl logs rabbitmq-local-0的输出：

BOOT FAILED
===========

Config file generation failed:
=CRASH REPORT==== 23-Jul-2019::15:32:52.880991 ===
  crasher:
    initial call: lager_handler_watcher:init/1
    pid: <0.95.0>
    registered_name: []
    exception exit: noproc
      in function  gen:do_for_proc/2 (gen.erl, line 228)
      in call from gen_event:rpc/2 (gen_event.erl, line 239)
      in call from lager_handler_watcher:install_handler2/3 (src/lager_handler_watcher.erl, line 117)
      in call from lager_handler_watcher:init/1 (src/lager_handler_watcher.erl, line 51)
      in call from gen_server:init_it/2 (gen_server.erl, line 374)
      in call from gen_server:init_it/6 (gen_server.erl, line 342)
    ancestors: [lager_handler_watcher_sup,lager_sup,<0.87.0>]
    message_queue_len: 0
    messages: []
    links: [<0.90.0>]
    dictionary: []
    trap_exit: false
    status: running
    heap_size: 610
    stack_size: 27
    reductions: 228
  neighbours:

15:32:53.679 [error] Syntax error in /opt/bitnami/rabbitmq/etc/rabbitmq/rabbitmq.conf after line 14 column 1, parsing incomplete
=SUPERVISOR REPORT==== 23-Jul-2019::15:32:53.681369 ===
    supervisor: {local,gr_counter_sup}
    errorContext: child_terminated
    reason: killed
    offender: [{pid,<0.97.0>},
               {id,gr_lager_default_tracer_counters},
               {mfargs,{gr_counter,start_link,
                                   [gr_lager_default_tracer_counters]}},
               {restart_type,transient},
               {shutdown,brutal_kill},
               {child_type,worker}]
=SUPERVISOR REPORT==== 23-Jul-2019::15:32:53.681514 ===
    supervisor: {local,gr_param_sup}
    errorContext: child_terminated
    reason: killed
    offender: [{pid,<0.96.0>},
               {id,gr_lager_default_tracer_params},
               {mfargs,{gr_param,start_link,[gr_lager_default_tracer_params]}},
               {restart_type,transient},
               {shutdown,brutal_kill},
               {child_type,worker}]

如果我删除 rabbitmq.extraConfiguration 部分，节点会正常启动，因此我在策略中输入的方式一定有问题。知道我做错了什么吗？

谢谢。

Answer 1

根据https://github.com/helm/charts/tree/master/stable/rabbitmq#load-definitions，可以将JSON 配置链接为extraConfiguration。所以我们最终得到了这个可行的设置：

rabbitmq-values.yaml：

rabbitmq:
  loadDefinition:
    enabled: true
    secretName: rabbitmq-load-definition
  extraConfiguration:
    management.load_definitions = /app/load_definition.json

rabbitmq-secret.yaml：

apiVersion: v1
kind: Secret
metadata:
  name: rabbitmq-load-definition
type: Opaque
stringData:
  load_definition.json: |-
    {
      "vhosts": [
        {
          "name": "/"
        }
      ],
      "policies": [
        {
          "name": "queue-mirroring-exactly-two",
          "pattern": "^ha\.",
          "vhost": "/",
          "definition": {
            "ha-mode": "exactly",
            "ha-params": 2
          }
        }
      ]
    }

必须在播放 Helm 图表之前将密钥加载到 Kubernetes，如下所示：kubectl apply -f ./rabbitmq-secret.yaml。

Answer 2

您可以使用 HelmChart 的配置默认值

如果需要，您可以使用 extraSecrets 让图表为您创建密钥。这样，您无需在部署版本之前手动创建它。例如：

extraSecrets:
  load-definition:
    load_definition.json: |
      {
        "vhosts": [
          {
            "name": "/"
          }
        ]
      }
rabbitmq:
  loadDefinition:
    enabled: true
    secretName: load-definition
  extraConfiguration: |
    management.load_definitions = /app/load_definition.json

https://github.com/helm/charts/tree/master/stable/rabbitmq

Answer 3

不要使用extraConfiguration，而是使用advancedConfiguration，你应该把所有这些信息放在这个部分，因为它是经典配置格式（erlang）