Issue
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We are trying to push a Docker image to a Amazon ECR repository in a Pipeline, and we see following messages in the console output.
[docker_container] Running shell script + docker tag --force=true my-image:38 my-image:38 unknown flag: --force See 'docker tag --help'. + docker tag my-image:38 my-image:38 The push refers to repository [docker.io/library/my-image] c31d9a5958c9: Preparing 1e9451bf9430: Preparing 36698d5e0963: Preparing f9e79a7653f9: Preparing efa0b7a2d37b: Preparing fe548f92b224: Preparing a7d53ea16e81: Preparing e53f74215d12: Preparing fe548f92b224: Waiting a7d53ea16e81: Waiting e53f74215d12: Waiting denied: requested access to the resource is denied
Resolution
The tag step fails because the docker version do not know the deprecated parameter --force=true, for more details take a look at JENKINS-42152
There is the bug related to withDockerRegistry step JENKINS-38018, it will not work, so try to use this example that uses docker.withRegistry() instead withDockerRegistry() in it works if the repository "my-image" exists in Amaron ECR repository.
node {
//cleanup current user docker credentials
sh 'rm ~/.dockercfg || true'
sh 'rm ~/.docker/config.json || true'
//configure registry
docker.withRegistry('https://ID.ecr.eu-west-1.amazonaws.com', 'ecr:eu-west-1:86c8f5ec-1ce1-4e94-80c2-18e23bbd724a') {
//build image
def customImage = docker.build("my-image:${env.BUILD_ID}")
//push image
customImage.push()
}