Troubleshooting Bring Back SSH for App Service (Blessed) Images
Overview
The blog will show you how to bring back the SSH feature on App Service (Blessed) Images. By default these commands will bring up the default parking page, as shown below, and make the SSH feature available.
This blog is not written for custom docker images running on app services. Refer to the following blogs if you are using a custom image.
Commands
Navigate to your app service on the Azure Portal then click on
Configuration -> General Settings -> Startup Command
Enter the below command dependant on your language stack and save your changes.
Make sure to remove or replace this command when you are done troubleshooting, otherwise your app service will continue to serve the default parking page.
Dot Net
dotnet /defaulthome/hostingstart/hostingstart.dll
Node
node /opt/startup/default-static-site.js
Python
gunicorn application:app --timeout 600 --access-logfile '-' --error-logfile '-' -c /opt/startup/gunicorn.conf.py --chdir=/opt/defaultsite
Java (SE)
java -jar -Dserver.port=80 /usr/local/appservice/parkingpage.jar
Go
/opt/startup/hostingstart
Reasoning and Use Cases
Sometimes deployment or startup issues can be tricky to troubleshoot on linux app services. If your container is crashing after a deployment you will not have access to this feature. This is because the SSH process is started on the app container itself.
With SSH working you can navigate the application containers file system to see what files are present and experiment with different startup commands to validate they are working successfully. If your container is not crashing, this feature should be working by default without modifying the startup command.
