Selenium 4：Chrome 节点未正确注册到集线器

Question

我有一个包含以下两个容器的 Openshift 3 集群：selenium-hub 和 selenium-node-chrome。请参阅下面随附的部署和服务 yaml 文件。

中心部署：

apiVersion: apps.openshift.io/v1
kind: DeploymentConfig
metadata:
  labels:
    app: selenium-hub
    selenium-hub: master
  name: selenium-hub
spec:
  replicas: 1
  selector:
    type: selenium-hub
  template:
    metadata:
      labels:
        type: selenium-hub
      name: selenium-hub
    spec:
      containers:
        - image: 'selenium/hub:latest'
          imagePullPolicy: IfNotPresent
          name: master
          ports:
            - containerPort: 4444
              protocol: TCP
            - containerPort: 4442
              protocol: TCP
            - containerPort: 4443
              protocol: TCP
  triggers:
    - type: ConfigChange

中心服务：

apiVersion: v1
kind: Service
metadata:
  labels:
    app: selenium-hub
    selenium-hub: master
  name: selenium-hub
spec:
  ports:
    - name: selenium-hub
      port: 4444
      protocol: TCP
      targetPort: 4444
    - name: publish
      port: 4442
      protocol: TCP
      targetPort: 4442
    - name: subscribe
      port: 4443
      protocol: TCP
      targetPort: 4443
  selector:
    type: selenium-hub
  type: ClusterIP

节点部署：

apiVersion: apps.openshift.io/v1
kind: DeploymentConfig
metadata:
  labels:
    app: selenium-node-chrome
  name: selenium-node-chrome
spec:
  replicas: 1
  revisionHistoryLimit: 10
  selector:
    browser: chrome
  template:
    metadata:
      labels:
        app: node-chrome
        browser: chrome
      name: selenium-node-chrome-master
    spec:
      containers:
        - env:
            - name: SE_EVENT_BUS_HOST
              value: selenium-hub
            - name: SE_EVENT_BUS_PUBLISH_PORT
              value: '4442'
            - name: SE_EVENT_BUS_SUBSCRIBE_PORT
              value: '4443'
            - name: SE_NODE_HOST
              value: node-chrome
            - name: SE_NODE_PORT
              value: '5555'
          image: 'selenium/node-chrome:4.0.0-20211102'
          imagePullPolicy: IfNotPresent
          name: master
          ports:
            - containerPort: 5555
              protocol: TCP
  triggers:
    - type: ConfigChange

节点服务：

apiVersion: v1
kind: Service
metadata:
  labels:
    app: selenium-node-chrome
  name: selenium-node-chrome
spec:
  ports:
    - name: node-port
      port: 5555
      protocol: TCP
      targetPort: 5555
    - name: node-port-grid
      port: 4444
      protocol: TCP
      targetPort: 4444
  selector:
    browser: chrome
  type: ClusterIP

我的问题： 集线器和节点正在启动，但节点只是不断发送注册事件，集线器正在记录一些我不太了解的信息。请参阅下面附带的日志。

节点日志：

Setting up SE_NODE_GRID_URL...
Selenium Grid Node configuration: 
[events]
publish = "tcp://selenium-hub:4442"
subscribe = "tcp://selenium-hub:4443"

[server]
host = "node-chrome"
port = "5555"
[node]
session-timeout = "300"
override-max-sessions = false
detect-drivers = false
max-sessions = 1

[[node.driver-configuration]]
display-name = "chrome"
stereotype = '{"browserName": "chrome", "browserVersion": "95.0", "platformName": "Linux"}'
max-sessions = 1

Starting Selenium Grid Node...
11:34:31.635 INFO [LoggingOptions.configureLogEncoding] - Using the system default encoding
11:34:31.643 INFO [OpenTelemetryTracer.createTracer] - Using OpenTelemetry for tracing
11:34:31.774 INFO [UnboundZmqEventBus.<init>] - Connecting to tcp://selenium-hub:4442 and tcp://selenium-hub:4443
11:34:31.843 INFO [UnboundZmqEventBus.<init>] - Sockets created
11:34:32.854 INFO [UnboundZmqEventBus.<init>] - Event bus ready
11:34:33.018 INFO [NodeServer.createHandlers] - Reporting self as: http://node-chrome:5555 
11:34:33.044 INFO [NodeOptions.getSessionFactories] - Detected 1 available processors
11:34:33.115 INFO [NodeOptions.report] - Adding chrome for {"browserVersion": "95.0","browserName": "chrome","platformName": "Linux","se:vncEnabled": true} 1 times
11:34:33.130 INFO [Node.<init>] - Binding additional locator mechanisms: name, relative, id
11:34:33.471 INFO [NodeServer.start] - Starting registration process for node id 2832e819-cf31-4bd9-afcc-cd2b27578d58
11:34:33.473 INFO [NodeServer.execute] - Started Selenium node 4.0.0 (revision 3a21814679): http://node-chrome:5555 
11:34:33.476 INFO [NodeServer.lambda$start] - Sending registration event...
11:34:43.479 INFO [NodeServer.lambda$start] - Sending registration event...
11:34:53.481 INFO [NodeServer.lambda$start] - Sending registration event...

集线器日志：

2021-12-07 11:14:22,663 INFO spawned: 'selenium-grid-hub' with pid 11
2021-12-07 11:14:23,664 INFO success: selenium-grid-hub entered RUNNING state, process has stayed up for > than 0 seconds (startsecs)
11:14:23.953 INFO [LoggingOptions.configureLogEncoding] - Using the system default encoding
11:14:23.961 INFO [OpenTelemetryTracer.createTracer] - Using OpenTelemetry for tracing
11:14:24.136 INFO [BoundZmqEventBus.<init>] - XPUB binding to [binding to tcp://*:4442, advertising as tcp://XXXXXXX:4442], XSUB binding to [binding to tcp://*:4443, advertising as tcp://XXXXXX:4443]
11:14:24.246 INFO [UnboundZmqEventBus.<init>] - Connecting to tcp://XXXXXX:4442 and tcp://XXXXXXX:4443
11:14:24.275 INFO [UnboundZmqEventBus.<init>] - Sockets created
11:14:25.278 INFO [UnboundZmqEventBus.<init>] - Event bus ready
11:14:26.232 INFO [Hub.execute] - Started Selenium Hub 4.1.0 (revision 87802e897b): http://XXXXXXX:4444 
11:14:46.965 INFO [Node.<init>] - Binding additional locator mechanisms: name, relative, id
11:15:46.916 INFO [Node.<init>] - Binding additional locator mechanisms: relative, name, id
11:17:52.377 INFO [Node.<init>] - Binding additional locator mechanisms: relative, id, name

谁能告诉我为什么集线器不注册节点？如果您需要任何进一步的信息，请告诉我。非常感谢

Answer 1

您没有从中心容器公开端口 4443 和 4442（请参阅 spec.containers 的端口部分）

Answer 2

你在同一台机器上，所以我认为你不需要使用环境变量：SE_NODE_HOST 在节点部署中只使用这些变量：

SE_EVENT_BUS_HOST=selenium-hub
SE_EVENT_BUS_PUBLISH_PORT=4442
SE_EVENT_BUS_SUBSCRIBE_PORT=4443

如果您认为您不在同一个虚拟机中，则需要使用这些环境变量正确配置节点部署：

SE_EVENT_BUS_HOST=<ip-of-hub-machine>
SE_EVENT_BUS_PUBLISH_PORT=4442
SE_EVENT_BUS_SUBSCRIBE_PORT=4443
SE_NODE_HOST=<ip-of-node-machine>

请不要添加未使用的环境变量，如：'SE_NODE_PORT' 因为 selenium 图像不支持除了您可以在 Github [=20= 的文档中阅读的环境变量之外的其他环境变量] 项目：https://github.com/SeleniumHQ/docker-selenium。如果你非常想使用你的变量。所以创建你自己的 selenium 图像（我不推荐这样做）我对你说的话成功了。

Answer 3

所以，有点晚了，但我仍然遇到同样的问题 - docker-compose 示例给了我 selenium-hub 作为主机，这在那种情况下是正确的，因为它指向定义的容器selenium-hub 服务。但是，在 Kubernetes 中，inter-pod 通信需要通过服务进行。有多种服务，但为了从集群内部访问它，在这种情况下使用 ClusterIP (docs here for more info).

是最简单的

我解决它的方法是为事件总线使用的两个端口提供服务：

bus-publisher（端口 4442）
bus-subscription（端口 4443）

在清单 yaml 中，如下所示：

apiVersion: v1
kind: Service
metadata:
  labels:
    app-name: selenium
  name: bus-sub
  namespace: selenium
spec:
  ports:
  - port: 4443
    protocol: TCP
    targetPort: 4443
  selector:
    app: selenium-hub
  type: ClusterIP

Selenium 4：Chrome 节点未正确注册到集线器

Selenium 4: Chrome Node does not register correctly to the hub

selenium

selenium-webdriver

kubernetes

openshift

selenium-grid