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docker - 在 kubernetes 中具有持久容量的 redisinsights

问题描述

我有以下.yaml文件要安装redisinsights在 kubernetes 中，并具有持久性支持。

apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: redisinsight-storage-class
provisioner: 'kubernetes.io/gce-pd'
parameters:
  type: 'pd-standard'
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: redisinsight-volume-claim
spec:
  storageClassName: redisinsight-storage-class
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 10Gi
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: redisinsight #deployment name
  labels:
    app: redisinsight #deployment label
spec:
  replicas: 1 #a single replica pod
  selector:
    matchLabels:
      app: redisinsight #which pods is the deployment managing, as defined by the pod template
  template: #pod template
    metadata:
      labels:
        app: redisinsight #label for pod/s
    spec:
      initContainers:
        - name: change-data-dir-ownership
          image: alpine:3.6
          command:
            - chmod
            - -R
            - '777'
            - /db
          volumeMounts:
            - name: redisinsight
              mountPath: /db
      containers:
        - name: redisinsight #Container name (DNS_LABEL, unique)
          image: redislabs/redisinsight:1.6.1 #repo/image
          imagePullPolicy: Always #Always pull image
          volumeMounts:
            - name: redisinsight #Pod volumes to mount into the container's filesystem. Cannot be updated.
              mountPath: /db
          ports:
            - containerPort: 8001 #exposed conainer port and protocol
              protocol: TCP
      volumes:
        - name: redisinsight
          persistentVolumeClaim:
            claimName: redisinsight-volume-claim
---
apiVersion: v1
kind: Service
metadata:
  name: redisinsight
spec:
  ports:
    - port: 8001
      name: redisinsight
  type: LoadBalancer
  selector:
    app: redisinsight

但是，它无法启动并给出错误：

INFO 2020-07-03 06:30:08,117 redisinsight_startup Registered SIGTERM handler
ERROR 2020-07-03 06:30:08,131 redisinsight_startup Error in main()
Traceback (most recent call last):
  File "./startup.py", line 477, in main
ValueError: invalid literal for int() with base 10: 'tcp://10.69.9.111:8001'
Traceback (most recent call last):
  File "./startup.py", line 495, in <module>
  File "./startup.py", line 477, in main
ValueError: invalid literal for int() with base 10: 'tcp://10.69.9.111:8001'

但是相同的 docker 映像，当通过 docker 在本地运行时：

docker run -v redisinsight:/db -p 8001:8001 redislabs/redisinsight

工作正常。我究竟做错了什么 ？

感觉就像 redisinsights 试图将端口读取为 int 但不知何故得到一个字符串并且感到困惑。但我无法理解本地 docker 运行如何正常工作。

标签： dockerkubernetesredisredisinsights

解决方案

更新：

RedisInsight 的kubernetes 文档最近更新了。它清楚地描述了如何创建带有和不带有服务的 RedisInsight k8s 部署。

IT 还解释了当已经存在名为“redisinsight”的服务时该怎么做：

注意 - 如果部署将由名为“redisinsight”的服务公开，请设置 REDISINSIGHT_HOST 和 REDISINSIGHT_PORT 环境变量以覆盖服务创建的环境变量。

问题在于服务的名称。

从文档中提到，RedisInsight 有一个环境变量REDISINSIGHT_PORT，可以配置 RedisInsight 可以运行的端口。

当您在 Kubernetes 中创建服务时，与该服务匹配的所有 pod 都会获取一个环境变量<SERVICE_NAME>_PORT=<SERVICE_IP>:<SERVICE_PORT>。

因此，当您尝试使用名称创建上述服务时redisinsight，Kubernetes 会传递服务环境变量REDISINSIGHT_PORT=<SERVICE_IP>:SERVICE_PORT。但是端口环境变量 ( REDISINSIGHT_PORT) 被记录为端口号而不是端点，当在 Pod 上运行的 redisinsight 尝试使用环境变量作为端口号时，这会使 Pod 崩溃。

因此，将服务的名称更改为不同的名称，而不是redisinsight它应该可以工作。

这是一个快速部署和服务文件：

部署：

apiVersion: apps/v1
kind: Deployment
metadata:
  name: redisinsight #deployment name
  labels:
    app: redisinsight #deployment label
spec:
  replicas: 1 #a single replica pod
  selector:
    matchLabels:
      app: redisinsight #which pods is the deployment managing, as defined by the pod template
  template: #pod template
    metadata:
      labels:
        app: redisinsight #label for pod/s
    spec:
      containers:
      - name:  redisinsight #Container name (DNS_LABEL, unique)
        image: redislabs/redisinsight:1.6.3 #repo/image
        imagePullPolicy: IfNotPresent
        volumeMounts:
        - name: db #Pod volumes to mount into the container's filesystem. Cannot be updated.
          mountPath: /db
        ports:
        - containerPort: 8001 #exposed conainer port and protocol
          protocol: TCP
      volumes:
      - name: db
        emptyDir: {} # node-ephemeral volume https://kubernetes.io/docs/concepts/storage/volumes/#emptydir

服务：

apiVersion: v1
kind: Service
metadata:
  name: redisinsight-http # name should not be redisinsight 
spec:
  type: LoadBalancer
  ports:
    - port: 80
      targetPort: 8001
  selector:
    app: redisinsight

请注意服务的名称。

redisinsight pod的日志：

 INFO 2020-09-02 11:46:20,689 redisinsight_startup Registered SIGTERM handler
 INFO 2020-09-02 11:46:20,689 redisinsight_startup Starting webserver...
 INFO 2020-09-02 11:46:20,689 redisinsight_startup Visit http://0.0.0.0:8001 in your web browser. Press CTRL-C to exit.

还有服务端点（来自 minikube）：

$ minikube service list                                                                              
|----------------------|------------------------------------|--------------|-------------------------|
|      NAMESPACE       |                NAME                | TARGET PORT  |           URL           |
|----------------------|------------------------------------|--------------|-------------------------|
| default              | kubernetes                         | No node port |
| default              | redisinsight-http                  |           80 | http://172.17.0.2:30860 |
| kube-system          | ingress-nginx-controller-admission | No node port |
| kube-system          | kube-dns                           | No node port |
| kubernetes-dashboard | dashboard-metrics-scraper          | No node port |
| kubernetes-dashboard | kubernetes-dashboard               | No node port |
|----------------------|------------------------------------|--------------|-------------------------|

顺便说一句，如果您根本不想创建服务（这与问题无关），您可以进行端口转发：

kubectl port-forward <redisinsight-pod-name> 8001:8001

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