1 开启hub成功
2 appium -g 5723 --nodeconfig D:\Study\Automation_Tester_Guide\Lesson7_appcrawler_selenium_grid\selenium_grid\node2_appium.json --session-override 注册，报错
appium -g 5723 --nodeconfig D:\Study\Automation_Tester_Guide\Lesson7_appcrawler_selenium_grid\selenium_grid\node2_appium.json --session-override
[Appium] Welcome to Appium v1.15.1
[Appium] Non-default server args:
[Appium] sessionOverride: true
[Appium] logFile: 5723
[Appium] nodeconfig: D:\Study\Automation_Tester_Guide\Lesson7_appcrawler_selenium_grid\selenium_grid\node2_appium.json
[HTTP] Could not start REST http interface listener. The requested port may already be in use. Please make sure there is no other instance of this server running already.
Fatal Error: listen EADDRINUSE: address already in use 0.0.0.0:4723
at Server.setupListenHandle [as _listen2] (net.js:1313:16)
at listenInCluster (net.js:1361:12)
at doListen (net.js:1500:7)
at processTicksAndRejections (internal/process/task_queues.js:85:21)
同时注册两个节点注册不上去，一开始成功了，后面测试用例没跑起来，然后重新关了再注册就不行了，发现json文件里设置的端口号没有用，一直往4723端口上注册，导致第二个节点注册不成功，报错