Recently I installed docker on my work machine, as I had to verify some changes related to our documentation on my local machine.

Everything went well until I wanted to execute a docker command which had to download an image from our GitHub package, as we use GitHub Packages to publish our docker images.

When I tried to run my docker command below I started getting an error Unable to find image 'ghcr.io/org/dockerimage:latest' locally

docker run -it --rm -v .:/app -p 3000:3000 ghcr.io/org/dockerimage:latest

Unable to find image 'ghcr.io/org/dockerimage:latest' locally
docker: Error response from daemon: Head "https://ghcr.io/v2/org/dockerimage/manifests/latest": unauthorized.
See 'docker run --help'.

What went wrong?

I use my personal GitHub account at my work, so I understood that docker is not able to connect to my GitHub account as I am using SSO to login and not my GitHub account for docker.

Solution

I searched across and there was limited help, I found that I need to authinticate my GitHub account from docker and ended un finding docker login commmand.

But I was already authenticated with My org account.

Then I tried using docker login ghcr.io -u <my-github-username> and this command asked me to enter my password, but I ended up getting denied error and nothing happened.

Next try was to use PAT(Personal Access Token) I created a new PAT with below rights

• write:packages
• read:packages

And ran docker login ghcr.io -u <my-github-username> but this time I entered my PAT and thats it, it worked.