Services also typically bind to well-known ports such as 22, 53, or 5432 to make the service easy to find. Only 65,536 ports are available for services to bind, with the lowest 1,024 generally reserved for binding by the root user. This matters when you're running large numbers of containers that use the same port by default, and you don't want to manually assign or track alternative port numbers.Īs a general rule, a port can only map to a single service or process on each host (multiplexing ports and multi-port services are something of an exception).
There are a number of use cases for port mapping, but for DevOps at scale the primary reason is generally to enable mapping well-known service ports to available ports on the host. Despite the fact that i have the option -with-registry-auth. The problem is that, when I do a docker pull :12345/myimage:mytag on the workers, it pulls the image successfully and without any problem, but not through an docker stack deploy command. Jan 31 11:22:29 myhost dockerd: time="T11:22:29.548642584+01:00" level=warning msg="failed to deactivate service binding for container test-stack_myservice.1.c1uy2gnwdcmibp6l2p9rfxcsh" error="No such container: test-stack_myservice.1.c1uy2gnwdcmibp6l2p9rfxcsh" module=node/agent node.id=rarbt9afb16y7j77bfwiacby2 Jan 31 11:22:24 myhost dockerd: time="T11:22:24.618840324+01:00" level=error msg="fatal task error" error="No such image: :12345/myimage:mytag" module=node/agent/taskmanager node.id=rarbt9afb16y7j77bfwiacby2 service.id=ej4y7wbwp539u7mmmhfashz93 task.id=c1uy2gnwdcmibp6l2p9rfxcsh Jan 31 11:22:24 myhost dockerd: time="T11:22:24.618121224+01:00" level=error msg="pulling image failed" error="unauthorized: authentication required" module=node/agent/taskmanager node.id=rarbt9afb16y7j77bfwiacby2 service.id=ej4y7wbwp539u7mmmhfashz93 task.id=c1uy2gnwdcmibp6l2p9rfxcsh Jan 31 11:22:24 myhost dockerd: time="T11:22:24.618063948+01:00" level=info msg="Attempting next endpoint for pull after error: unauthorized: authentication required" Jan 31 11:22:24 myhost dockerd: time="T11:22:24.574342640+01:00" level=info msg="Attempting next endpoint for pull after error: Get : http: server gave HTTP response to HTTPS client" On their logs, I get the following: Jan 31 11:22:24 myhost dockerd: time="T11:22:24.574302458+01:00" level=warning msg="Error getting v2 registry: Get : http: server gave HTTP response to HTTPS client" The workers aren't uploading the images I want.
Shutdown Rejected 11 minutes ago "No such image: :12345/myimage:mytag" The problem is first seen here with a docker stack ps test-stack. I have my credentials to access this registry are defined in. I'm launching through Ansible (just SSH basically) a docker stack deploy, the issue is also true when launching directly from a manager: docker stack deploy -prune -with-registry-auth -c /docker/docker-compose.yml "test-stack"
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