【Azure 应用服务】App Server 部署后，Docker报错，找不到8080端口

问题描述

App Service for Container.  Docker Image 推送到ACR(向 Azure 容器注册表)， 配置App Service并部署成功了。查看Docker日志（Log Stream页面）详情如下：

/home/LogFiles/2021_09_06_ll0sddwk000002_docker.log  (https://mytestappservice.scm.chinacloudsites.cn/api/vfs/LogFiles/2021_09_06_ll0sddwk000002_docker.log)
2021-09-06T03:28:44.786Z INFO  - Starting container for site
2021-09-06T03:28:44.787Z INFO  - docker run -d -p 8080:8080 --name mytestappservice_1_028b2421 -e WEBSITES_ENABLE_APP_SERVICE_STORAGE=false -e WEBSITE_SITE_NAME=mytestappservice -e WEBSITE_AUTH_ENABLED=False -e PORT=8080 -e WEBSITE_ROLE_INSTANCE_ID=0 -e WEBSITE_HOSTNAME=mytestappservice.chinacloudsites.cn -e WEBSITE_INSTANCE_ID=35a46b817ece1fe1cb77c89f27ac5f991e8f7d4f86abe5add36a6d6afb3f9989 myacrtest01.azurecr.cn/myacrr01/backendapi:latest  
2021-09-06T03:28:44.788Z INFO  - Logging is not enabled for this container.
Please use https://aka.ms/linux-diagnostics to enable logging to see container logs here.
2021-09-06T03:28:49.314Z INFO  - Initiating warmup request to container mytestappservice_1_028b2421 for site mytestappservice
2021-09-06T03:29:20.005Z INFO  - Waiting for response to warmup request for container mytestappservice_1_028b2421. Elapsed time = 30.6914685 sec
2021-09-06T03:29:25.092Z ERROR - Container mytestappservice_1_028b2421 for site mytestappservice has exited, failing site start
2021-09-06T03:29:25.107Z ERROR - Container mytestappservice_1_028b2421 didn't respond to HTTP pings on port: 8080, failing site start. See container logs for debugging.
2021-09-06T03:29:25.127Z INFO  - Stopping site mytestappservice because it failed during startup.

问题解决

对于自定义容器，App Service默认会尝试对端口 80 和 8080 进行自动端口检测， 而这里出现了HTTP ping 8080 failed，可以检测在Dockerfile中是否已经配置使用了8080端口。如果有，则从Dockerfile中修改，或者是通过App Service的Application Setting配置 WEBSITES_PORT参数，指定非8080的值，如WEBSITES_PORT = 8081。以解决问题。

更多有用有效的App Service for Container配置值，见：https://docs.microsoft.com/zh-cn/azure/app-service/reference-app-settings?tabs=kudu%2Cdotnet#custom-containers

参考资料

将应用服务配置为从注册表部署映像: https://docs.microsoft.com/zh-cn/azure/app-service/tutorial-custom-container?pivots=container-linux#configure-app-service-to-deploy-the-image-from-the-registry

自定义容器配置参数名：https://docs.microsoft.com/zh-cn/azure/app-service/reference-app-settings?tabs=kudu%2Cdotnet#custom-containers