FAQ about Container Solution

How do I perform auto updates based on immutable tags?How do I perform auto updates based on immutable tags?

Updating a Docker container will not work with tags that persist from version to version. We recommend using a new tag for each Docker image.

Getting startedGetting started

There is a number of disadvantages of using tags that persist from version to version:

• When a problem occurs, it is difficult to find its source if multiple identical VMs have the same tag but different code.
• A cluster of multiple VMs can be heterogeneous, for example, if one VM restarts and updates a Docker image.
• It is difficult to distinguish between Docker image versions on a VM.

I cannot create a Docker container. Why is that?I cannot create a Docker container. Why is that?

• Check that the Docker image name is correct.
• Make sure the service account linked to the VM has the container-registry.images.puller rights to the appropriate Docker image.
• Check that the VM has internet access.
• You can also view errors in logs by running the sudo journalctl -eu yc-container-daemon command on the VM.

How can I close a port for public access and leave it accessible within the network?How can I close a port for public access and leave it accessible within the network?

• If you use a standard Container Optimized Image (one Docker container configured by parameters), all ports that are open in the container will also be open on the host.
• If you need other network settings for Docker containers, you can configure them using a Container Optimized Image with the Docker Compose specification.
• To make your Docker container's port open on the host but disable access to it from the internet, you can use security groups.