Known issues in Docker Cloud

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This is a list of known issues with current versions of Docker Engine along with our recommended workaround. You might encounter these errors in Docker Cloud.

Error message: Get i/o timeout

Get https://index.docker.io/v1/repositories/<image>/images: dial tcp: lookup <registry host> on <ip>:53: read udp <ip>:53: i/o timeout

Description

The DNS resolver configured on the host cannot resolve the registry’s hostname.

N/A

Workaround

Retry the operation, or if the error persists, use another DNS resolver. You can do this by updating your /etc/resolv.conf file with these or other DNS servers:

nameserver 8.8.8.8
nameserver 8.8.4.4

Error message: 500 Server Error: userland proxy

500 Server Error: Internal Server Error (“Cannot start container <id>: Error starting userland proxy: listen tcp 0.0.0.0:<port>: bind: address already in use”)

Description

Docker Cloud is trying to deploy a container publishing a port which is already being used by a process on the host (like the SSH server listening in port 22).

N/A

Workaround

Either choose another port, or SSH into the node and manually stop the process which is using the port that you are trying to use.

Error message: 500 Server Error: bind failed

500 Server Error: Internal Server Error (“Cannot start container <id>: Bind for 0.0.0.0:<port> failed: port is already allocated”)

Description

Docker Cloud is trying to deploy a container publishing a port which is already used by another container outside of the scope of Docker Cloud.

N/A

Workaround

Either choose another port, or SSH into the node and manually stop the container which is using the port that you are trying to use.

Error message: 500 Server Error: cannot start, executable not found

500 Server Error: Internal Server Error (“Cannot start container <id>: [8] System error: exec: “<path>”: executable file not found in $PATH”)

Description

The run command you specified for the container does not exist on the container.

N/A

Workaround

Edit the service to fix the run command.

Error message: Timeout when pulling image from the registry

Timeout when pulling image from the registry

Description

Timeouts occur when pulling the image takes more than 10 minutes. This can sometimes be caused by the Docker daemon waiting for a nonexistent process while pulling the required image.

docker/docker#12823

Workaround

Restart the dockercloud-agent service (sudo service dockercloud-agent restart) on the node, or restart the node.

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