Fedora 26
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Docker : Use Docker-Registry
2017/07/30
 
Install Docker-Registry to build Private Registry for Docker images.
This example is based on the case to use self-signed certificates.
[1]
This example is based on the environment that SELnux is Permissive or Disabled.
[2]
On The Host which Docker-Registry Container runs, Create SSL Certificates, refer to here.
This example is based on the case that SSL certificates are made under the [/etc/pki/tls/certs] and set the [Common Name] as [dlp.srv.world].
[3] Copy to locate Certificates and pull Registry Image (v2).
Container Images are located under [/var/lib/regstry] on Registry v2 Container, so map to mount [/var/lib/docker/registry] on parent Host for Registry Container to use as Persistent Storage
[root@dlp ~]#
mkdir /etc/docker/certs.d/dlp.srv.world:5000

[root@dlp ~]#
cp -p /etc/pki/tls/certs/server.crt /etc/pki/tls/certs/domain.crt

[root@dlp ~]#
cp -p /etc/pki/tls/certs/server.key /etc/pki/tls/certs/domain.key

[root@dlp ~]#
cp -p /etc/pki/tls/certs/server.crt /etc/docker/certs.d/dlp.srv.world:5000/ca.crt
[root@dlp ~]#
docker pull registry:2

[root@dlp ~]#
mkdir /var/lib/docker/registry

[root@dlp ~]#
docker run -d -p 5000:5000 \
-e REGISTRY_HTTP_TLS_CERTIFICATE=/certs/domain.crt \
-e REGISTRY_HTTP_TLS_KEY=/certs/domain.key \
-v /etc/pki/tls/certs:/certs \
-v /var/lib/docker/registry:/var/lib/registry \
registry:2
[root@dlp ~]#
docker ps 

CONTAINER ID  IMAGE       COMMAND          CREATED         STATUS         PORTS                  NAMES
e7338be2ddd4  registry:2  "/entrypoin..."  23 seconds ago  Up 21 seconds  0.0.0.0:5000->5000/tcp loving_h..
[4] If Firewalld is running, allow mapped port.
[root@dlp ~]#
firewall-cmd --add-port=5000/tcp --permanent

success
[root@dlp ~]#
firewall-cmd --reload

success
[5] For pushing local Image to Registry Container server, set like follows.
# list images on Registry container

[root@dlp ~]#
curl -k https://localhost:5000/v2/_catalog

{"repositories":[]}
[root@dlp ~]#
docker images 

REPOSITORY                          TAG       IMAGE ID         CREATED       SIZE
docker.io/registry                  2         751f286bc25e     10 days ago   33.2 MB
registry.fedoraproject.org/fedora   latest    7f17e6b4a386     4 weeks ago   232 MB
# set a tag and push

[root@dlp ~]#
docker tag fedora dlp.srv.world:5000/fedora_reg

[root@dlp ~]#
docker push dlp.srv.world:5000/fedora_reg

The push refers to a repository [dlp.srv.world:5000/fedora_reg]
42ce6d637cc2: Pushed
latest: digest: sha256:9bc40b04427b92a009c416e06997f4f2de424185b7d52bb6def93df75b9d99d2 size: 529
[root@dlp ~]#
docker images 

REPOSITORY                          TAG        IMAGE ID        CREATED         SIZE
docker.io/registry                  2          751f286bc25e    10 days ago     33.2 MB
dlp.srv.world:5000/fedora_reg       latest     7f17e6b4a386    4 weeks ago     232 MB
registry.fedoraproject.org/fedora   latest     7f17e6b4a386    4 weeks ago     232 MB
[root@dlp ~]#
curl -k https://localhost:5000/v2/_catalog

{"repositories":["fedora_reg"]}
[6] For getting images from Registry Container server on a Docker node, set like follows.
# get certificates from Registry Container

[root@node01 ~]#
mkdir /etc/docker/certs.d/dlp.srv.world:5000

[root@node01 ~]#
cd /etc/docker/certs.d/dlp.srv.world:5000

[root@node01 dlp.srv.world:5000]#
scp dlp.srv.world:"/etc/docker/certs.d/dlp.srv.world:5000/ca.crt" ./
[root@node01 ~]#
docker pull dlp.srv.world:5000/fedora_reg

Using default tag: latest
Trying to pull repository dlp.srv.world:5000/fedora_reg ...
sha256:9bc40b04427b92a009c416e06997f4f2de424185b7d52bb6def93df75b9d99d2: Pulling from dlp.srv.world:5000/fedora_reg
4ca659ae84e5: Pull complete
Digest: sha256:9bc40b04427b92a009c416e06997f4f2de424185b7d52bb6def93df75b9d99d2
Status: Downloaded newer image for dlp.srv.world:5000/fedora_reg:latest
[root@node01 ~]#
docker images 

REPOSITORY                      TAG        IMAGE ID        CREATED        SIZE
dlp.srv.world:5000/fedora_reg   latest     7f17e6b4a386    4 weeks ago    232 MB
 
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