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Jenkins Pipeline Error: No ECDSA host key is known for github.com

Solution source: stderr: No ECDSA host key is known for github.com and you have requested strict checking

There are two solutions to this problem:

Option 1: Configure Jenkins to Use No verification​

This isn't a good practice as it may cause security issues.

Option 2: Configure the Jenkins Server/Container​

Execute this command on the server where Jenkins is installed:

ssh-keyscan github.com >> ~/.ssh/known_hosts

If your Jenkins runs in a container, you need to enter the container to execute this command. Create the file first if it doesn't exist.

docker exec -it -u root <containerId> /bin/bash
cd ~/.ssh/
touch known_hosts
ssh-keyscan github.com >> ~/.ssh/known_hosts

Then run your pipeline again and it should work.