Hi, did you try with alpine version image? I can't get it done with alpine version image. here is my .gitlab-ci.yal

deploy:
  stage: deploy
  script:
     - which ssh-agent || apk add --no-cache openssh-client
     - eval `ssh-agent -s`
     - sshecho $SSH_PRIVATE_KEY | ssh-add
     - echo -e Host $PRODUCTION_HOST_IP >> ~/.ssh/config
     - echo -e '\tStrictHostKeyChecking no' >> ~/.ssh/config
     - ssh [email protected]$PRODUCTION_HOST_IP 'do someting stuff'
  only:
    - master