Update docker image in Azure Container Instances

Question

I have an image in the repository on the docker hub. I created azure container instance based on the image in the repository on the docker hub. I updated the image in the repository on the docker hub. How can I apply changes to a container?

Answer 1

The ways I've found so far are

1. to use the Azure Resource explorer.

   • Find the container group
   • Click read/write
   • Click edit
   • Change the image version
   • Put password in imageRegistryCredentials when using a private registry.
   • Click Post

2. This blog post using the Go SDK.

3. Delete and recreate the group by using an ARM template. You'll loose the public ip using this approach.

You'll have some downtime in any of the cases above.

Answer 2

You can also use Azure CLI. Run az container create again using the same resource group name and container group name, with the new image tag. The container will be updated with new image.

Answer 3

In addition to the mentioned re-creation of the container group and depending on your scenario you could also deploy a container group pointing to the :latest docker image once.

In my scenario I have a scheduled container instance that is running once a day. Whenever it starts it is pulling the docker image with the :latest tag from the azure container registry. This avoids re-creation of the container group.