Docker Private Registry Setup

We can create our own secure private  docker repository where we can store our images and can be accessed from remote machine.

1. Goto /var/lib/docker in server and Create certificate using the domain name:

cd /var/lib/docker && mkdir certs
 mkdir -p certs && openssl req -newkey rsa:4096 -nodes -sha256 -keyout certs/sl09vmf0022.us.company.com.key -x509 -days 365 -out certs/sl09vmf0022.us.company.com.crt

2. Delete any old registry if exists:

docker rm  OR docker rmi registry:2

3. Recreate the registry using the newly created certificates by staying in the cert dir:

docker run -d -p 5000:5000 --restart=always --name bkdevregistry -v `pwd`/certs:/certs -e REGISTRY_HTTP_TLS_CERTIFICATE=/certs/sl09vmf0022.us.company.com.crt -e REGISTRY_HTTP_TLS_KEY=/certs/sl09vmf0022.us.company.com.key registry:2

4. Goto docker cert dir and copy the crt file as ca.crt and restart docker service

cd /etc/docker/certs.d/sl09vmf0022.us.company.com\:5000/
 cp /var/lib/docker/sl09vmf0022.us.company.com.crt /etc/docker/certs.d/sl09vmf0022.us.company.com\:5000/ca.crt
 update-ca-trust enable
 service docker restart

5. Now push images to private repository:

docker pull ubuntu
 docker tag ubuntu sl09vmf0022.ua.company.com:5000/ubuntu1404
 docker push sl09vmf0022.ua.company.com:5000/ubuntu1404

6. Client side configuration:

Copy the ca.crt file from docker registry server to local docker cert dir and restart docker service

mkdir -p /etc/docker/certs.d/sl09vmf0022.us.company.com\:5000/
 scp sl09vmf0022.us.company.com:/var/lib/docker/certs/sl09vmf0022.us.company.com.crt /etc/docker/certs.d/sl09vmf0022.us.company.com:5000/ca.crt
 service docker restart

7. Pull image from remote registry :

docker pull sl09vmf0022.us.company.com:5000/oel6u6

8. Check images in remote registry available using the crt file or in insecure mode:

curl -X GET https://sn09vmf0022.us.company.com:5000/v2/_catalog --cacert /etc/docker/certs.d/sn09vmf0022.us.company.com\:5000/ca.crt

OR

curl -X GET https://sl09vmf0022.us.company.com:5000/v2/_catalog --insecure

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