Docker : Use Registry2022/07/29

	Install Docker-Registry to build Private Registry for Docker images.
[1]	Pull the Registry image and run it. 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 ~]#

docker pull registry:2

[root@dlp ~]#

mkdir /var/lib/docker/registry

[root@dlp ~]#

docker run -d -p 5000:5000 \
-v /var/lib/docker/registry:/var/lib/registry \
registry:2

d063116f072ca8c107a0f4467b15cfcfc546ea155ae8a258e7348e77a796ebe0

[root@dlp ~]#

docker ps

CONTAINER ID   IMAGE        COMMAND                  CREATED          STATUS          PORTS                                       NAMES
d063116f072c   registry:2   "/entrypoint.sh /etc…"   11 seconds ago   Up 10 seconds   0.0.0.0:5000->5000/tcp, :::5000->5000/tcp   festive_bohr

# if Firewalld is running, allow ports

[root@dlp ~]#

firewall-cmd --add-port=5000/tcp

[root@dlp ~]#

firewall-cmd --runtime-to-permanent

# to use the Registry from Docker Client Hosts, set like follows

[root@client ~]#

vi /etc/docker/daemon.json

# create new or add
# add Hosts you allow HTTP connection (default is HTTPS)

{
  "insecure-registries":
    [
      "docker.internal:5000",
      "dlp.srv.world:5000"
    ]
}

[root@client ~]#

systemctl restart docker

[root@client ~]#

docker images

REPOSITORY                  TAG       IMAGE ID       CREATED             SIZE
quay.io/centos/centos       stream9   61674c24ebbf   31 hours ago        152MB
registry                    2         d1fe2eaf6101   10 days ago         24.1MB

[root@client ~]#

docker tag quay.io/centos/centos:stream9 dlp.srv.world:5000/centos:stream9

[root@client ~]#

docker push dlp.srv.world:5000/centos:stream9

[root@client ~]#

docker images

REPOSITORY                  TAG       IMAGE ID       CREATED             SIZE
dlp.srv.world:5000/centos   stream9   61674c24ebbf   31 hours ago        152MB
quay.io/centos/centos       stream9   61674c24ebbf   31 hours ago        152MB
registry                    2         d1fe2eaf6101   10 days ago         24.1MB

[2]	This is for the case you set self-signed certificate and enable HTTPS connection. This example is based on that certificate were created under the [/etc/pki/tls/certs] directory.

[root@dlp ~]#

docker run -d -p 5000:5000 \
-e REGISTRY_HTTP_TLS_CERTIFICATE=/certs/server.crt \
-e REGISTRY_HTTP_TLS_KEY=/certs/server.key \
-v /etc/pki/tls/certs:/certs \
-v /var/lib/docker/registry:/var/lib/registry \
registry:2

213fca43b7b889fc82ee2cd31742b75b700f22d003ec6e76e9ec5b38f3e1f403

# to use the Registry from other Docker Client Hosts, set like follows
# it's not need to add [insecure-registries] but
# need to locate server's certificate on the client side like follows

[root@client ~]#

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

[root@client ~]#

scp dlp.srv.world:/etc/pki/tls/certs/server.crt /etc/docker/certs.d/dlp.srv.world:5000/ca.crt

[root@client ~]#

docker tag centos dlp.srv.world:5000/centos:my-registry

[root@client ~]#

docker push dlp.srv.world:5000/centos:my-registry

[root@client ~]#

docker images

REPOSITORY                 TAG           IMAGE ID       CREATED      SIZE
nginx                      latest        670dcc86b69d   9 days ago   142MB
dlp.srv.world:5000/nginx   my-registry   670dcc86b69d   9 days ago   142MB

[3]	This is for the case you set valid certificate like Let's Encrypt and enable HTTPS connection. This example is based on that certificate were created under the [/etc/letsencrypt] directory.

[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

28512a4b96d93172b7af66f6b7263fdbff8d729a76659c8b955c60800b557f4f

# to use the Registry from other Docker Client Hosts, set like follows
# it's not need to change any specific settings, it can use with default

[root@client ~]#

docker tag centos dlp.srv.world:5000/centos:my-registry

[root@client ~]#

docker push dlp.srv.world:5000/centos:my-registry

[root@client ~]#

docker images

REPOSITORY                 TAG           IMAGE ID       CREATED      SIZE
nginx                      latest        670dcc86b69d   9 days ago   142MB
dlp.srv.world:5000/nginx   my-registry   670dcc86b69d   9 days ago   142MB

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