Unable to pull docker image – Repository not found
sudo docker pull hello-world latest: Pulling from hello-world 50a54e1f9180: Pulling fs layer 7a5a2d73abce: Pulling fs layer Pulling repository hello-world Repository not found
Docker version: (I cannot upgrade to newest docker on RHEL 6.9)
Docker version 1.7.1, build 786b29d/1.7.1
Could somebody explain me which protocols (https only?) are used during docker image pulling phase and what addresses are contacted (“https://registry-1.docker.io/v2” only?) ?
2 Solutions collect form web for “Unable to pull docker image – Repository not found”
Docker images can consist of multiple layers. By default, the Docker daemon will pull three layers of an image at a time but will pull less in case an image has lesser layers. Also, if no tag is provided, Docker Engine uses the
:latest tag as a default. Above is a basic log of your pull request indicating docker trying to pull layers of the image but failing, may be due to firewall restrictions or older docker version.
Docker uses the
https://protocol to communicate with a registry,
unless the registry is allowed to be accessed over an insecure
Not sure what all addresses it tries to connect to pull an image.
Problem was that firewall was blocking connections during pulling images.
Docker registry uses CDN so more URLs need to be allowed and not only registry URL.
I requested to allow the following URLs on company firewall and it is working now.
dseasb33srnrn.cloudfront.net auth.docker.io elb-registry.us-east-1.aws.dckr.io. us-east-1-elbregis-10fucsvj1tcgy-133821800.us-east-1.elb.amazonaws.com registry-1.docker.io registry-origin.docker.io index.docker.io elb-io.us-east-1.aws.dckr.io us-east-1-elbio-rm5bon1qaeo4-623296237.us-east-1.elb.amazonaws.com
Docker log file (/var/log/docker) help me to identify root problem.
There were the following errors:
level=error msg="Error from V2 registry: Get https://dseasb33srnrn.cloudfront.net/registry-v2/docker/registry/v2/blobs/sha256/78/78445dd45222097f5f8d5a16e48dc19c4ca162dcdb80010ab6f1ccfc7e2c0fa3/data?Expires=1493033299&Signature=DiEmffSxF1F9z-SRoGyX3NwzfeQY3BhE2Du3aPb1qy9VglXyn1mus7Xy9Y~DQnwaQ9IIN71FboK5lOAiN1Qj-x662qhioi72CJ-v02fiMHqC03FDb0l4LyULquU8GaalW3uZG4hdfuSqOBQ1qo9HEcxhMyQGqOqpfPUKjUlHqm8_&Key-Pair-Id=APKAJECH5M7VWIS5YZ6Q: read tcp 188.8.131.52:443: connection reset by peer"
The list of URLs which needs to be allowed I found here: