Jenkins Scripted Pipeline Job failing for docker login

Question

Jenkins Version - 2.164.1
Jenkins Docker Plugin Version – 1.1.6
Docker Version - 18.09.3, build 774a1f4

Problem:-

I have below code in my Jenkins scripted pipeline section. I have added my private Docker registry URL and Credentials added under Manage Jenkins --> Configure System. But pipeline Job is failing for docker login.

Error form Jenkins - ERROR: docker login failed

Code:-

stage('Build') { 
  withDockerRegistry(credentialsId: 'docker-reg-credentails', url: 'http://registryhub:8081/nexus/') {
    image = docker.image('registryhub:8085/ubuntu-16:1')
    image.pull()
    docker.image('registryhub:8085/ubuntu-16:1').inside {   
      sh 'cat /etc/issue'
    }
  }
}

Answer 1

Inside Stage, do something like below:

    script
        {
        def server = Nexus.server 'docker-reg-credentails'
        def buildRegistry = [ url: 'http://registryhub:8081/nexus/', credentialsId: 'docker-reg-credentails' ]
        def rtDocker = Nexus.docker server: server
            withDockerRegistry(registry: buildRegistry ) 
            {
                sh 'docker pull hello-world' 
                sh 'docker tag hello-world:latest hello-world:latest2' 
                rtDocker.addProperty("status", "stable") 
                def buildInfo = rtDocker.push 'hello-world:latest', 'docker-local'
                // Step 4: Publish the build-info to Nexus: server.publishBuildInfo buildInfo

                server.publishBuildInfo buildInfo
            }
            }

Answer 2

If you try to run docker login explicitly in sh, you can get more information about the cause of failure. Most probable cause would be access denied on connection to docker daemon. So you need add Jenkins account to docker group, e.g.

sudo usermod -a -G docker jenkins