Docker : Use Docker-Registry2019/07/24

	Install Docker-Registry to build Private Registry for Docker images.
[1]	On The Host which Docker-Registry Container runs, Get SSL Certificates, refer to here. This example is based on the case that SSL certificates are gotten under the [/etc/letsencrypt/live/dlp.srv.world] and set the [Common Name] as [dlp.srv.world].
[2]	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 -p /etc/docker/certs.d/dlp.srv.world:5000

root@dlp:~#

cp -p /etc/letsencrypt/live/dlp.srv.world/cert.pem /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/fullchain.pem \
-e REGISTRY_HTTP_TLS_KEY=/certs/privkey.pem \
-v /etc/letsencrypt/live/dlp.srv.world:/certs \
-v /var/lib/docker/registry:/var/lib/registry \
registry:2

131143d2def7d089976ce6dd658bf9c4ccc4e43beff3f6932da4d9c81841a768

root@dlp:~#

docker ps

CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                    NAMES
131143d2def7        registry:2          "/entrypoint.sh /etc…"   11 seconds ago      Up 10 seconds       0.0.0.0:5000->5000/tcp   clever_williamson

[3]	For pushing local Image to Registry Container server, set like follows.

# list images on Registry container

root@dlp:~#

curl https://dlp.srv.world:5000/v2/_catalog

{"repositories":[]}

root@dlp:~#

docker images

REPOSITORY                 TAG                 IMAGE ID            CREATED             SIZE
storage                    latest              51e28000b0fb        8 minutes ago       1.22MB
web_server                 latest              42e95a62ed8e        25 minutes ago      300MB
srv.world/debian_apache2   latest              4295df3e5c82        31 minutes ago      243MB
busybox                    latest              db8ee88ad75f        5 days ago          1.22MB
debian                     latest              00bf7fdd8baf        2 weeks ago         114MB
registry                   2                   f32a97de94e1        4 months ago        25.8MB

# set a tag and push

root@dlp:~#

docker tag debian dlp.srv.world:5000/debian_reg

root@dlp:~#

docker push dlp.srv.world:5000/debian_reg

The push refers to repository [dlp.srv.world:5000/debian_reg]
.....
.....
31b0e148310d: Pushed
latest: digest: sha256:2ea543d7e388e3cee7be9d37ae93b1eab62a108716e64bb71f6fa93948967e73 size: 529

root@dlp:~#

docker images

REPOSITORY                      TAG                 IMAGE ID            CREATED             SIZE
storage                         latest              51e28000b0fb        10 minutes ago      1.22MB
web_server                      latest              42e95a62ed8e        26 minutes ago      300MB
srv.world/debian_apache2        latest              4295df3e5c82        32 minutes ago      243MB
busybox                         latest              db8ee88ad75f        5 days ago          1.22MB
dlp.srv.world:5000/debian_reg   latest              00bf7fdd8baf        2 weeks ago         114MB
debian                          latest              00bf7fdd8baf        2 weeks ago         114MB
registry                        2                   f32a97de94e1        4 months ago        25.8MB

root@dlp:~#

curl https://dlp.srv.world:5000/v2/_catalog

{"repositories":["debian_reg"]}

[4]	For getting images from Registry Container server on a Docker node, set like follows.

# get certificates from Registry Container

root@node01:~#

mkdir -p /etc/docker/certs.d/dlp.srv.world:5000

root@node01:~#

cd /etc/docker/certs.d/dlp.srv.world:5000

root@node01:/etc/...5000#

scp debian@dlp.srv.world:"/etc/docker/certs.d/dlp.srv.world:5000/ca.crt" ./

root@node01:~#

docker pull dlp.srv.world:5000/debian_reg

Using default tag: latest
latest: Pulling from debian_reg
5ae19949497e: Pull complete
Digest: sha256:2ea543d7e388e3cee7be9d37ae93b1eab62a108716e64bb71f6fa93948967e73
Status: Downloaded newer image for dlp.srv.world:5000/debian_reg:latest

root@node01:~#

docker images

REPOSITORY                      TAG                 IMAGE ID            CREATED             SIZE
dlp.srv.world:5000/debian_reg   latest              00bf7fdd8baf        2 weeks ago         114MB

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