[FIXED] Check within Jenkinsfile if docker service exists

Issue

I am setting up an CI Pipelin by means of Jenkins.

I created the following Jenkinsfile:

pipeline {
agent none

stages {
    stage('Build and push image') {
        agent {
                label 'man'
              }
        steps {
            sh 'docker image build -t login:stage .'
            sh 'docker tag login:stage 192.168.66.201:5000/login:stage'
            sh 'docker push 192.168.66.201:5000/login:stage'
        }
    }
    stage('Create Service') {
        agent {
                label 'dev'
              }
        steps {
            sh 'docker service create --name loginService -p 40001:40001 --replicas=3  192.168.66.201:5000/login:stage'
        }
    }
} 
}

I know, I could use the components of docker (docker.withRegistry) but I like to do it manually in first attempt to exactly knew what happens.

But my question is how to check in the "Create Service"-Stage, if a docker service already exists. If he exists I like to execute an update statement.

You've got any idea? Using google or jenkins docs did not really helped me..

Solution

One way for doing this:

docker service ls | grep <service-name> && echo service-exists

If the service with name exists, the echo will execute. Replace the echo with the update command you intend to use.

Answered By - yamenk
Answer Checked By - David Goodson (JavaFixing Volunteer)