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Docker : Use Registry2023/06/22

 
Install Docker-Registry to build Private Registry for Docker images.
[1] Install Registry.
root@dlp:~#
apt -y install docker-registry
[2] Configure Registry.
This is the settings to use HTTP connection and no-authentication.
root@dlp:~#
vi /etc/docker/registry/config.yml
# comment out [auth] section like follows

version: 0.1
log:
  fields:
    service: registry
storage:
  cache:
    blobdescriptor: inmemory
  filesystem:
    rootdirectory: /var/lib/docker-registry
  delete:
    enabled: true
http:
  addr: :5000
  headers:
    X-Content-Type-Options: [nosniff]
#auth:
#  htpasswd:
#    realm: basic-realm
#    path: /etc/docker/registry
health:
  storagedriver:
    enabled: true
    interval: 10s
    threshold: 3

root@dlp:~#
systemctl restart docker-registry
# verify possible to access from any clients
# for HTTP connection, it needs to add [insecure-registries] setting

root@dlp:~#
vi /etc/docker/daemon.json
# create new
# add hosts to allow HTTP connection

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

root@dlp:~#
systemctl restart docker
# [push] from localhost

root@dlp:~#
docker images

REPOSITORY                 TAG       IMAGE ID       CREATED        SIZE
srv.world/debian-apache2   latest    b7891f747bd5   18 hours ago   227MB
srv.world/debian-nginx     latest    51f5190bb9d9   18 hours ago   170MB
debian                     latest    2dc39ba059dc   6 days ago     77.8MB

root@dlp:~#
docker tag debian dlp.srv.world:5000/debian:my-registry

root@dlp:~#
docker push dlp.srv.world:5000/debian:my-registry

root@dlp:~#
docker images

REPOSITORY                  TAG           IMAGE ID       CREATED        SIZE
srv.world/debian-apache2    latest        b7891f747bd5   18 hours ago   227MB
srv.world/debian-nginx      latest        51f5190bb9d9   18 hours ago   170MB
dlp.srv.world:5000/debian   my-registry   2dc39ba059dc   6 days ago     77.8MB
debian                      latest        2dc39ba059dc   6 days ago     77.8MB

# [pull] from another node

root@node01:~#
docker pull dlp.srv.world:5000/debian:my-registry

root@node01:~#
docker images

REPOSITORY                  TAG           IMAGE ID       CREATED      SIZE
dlp.srv.world:5000/debian   my-registry   2dc39ba059dc   6 days ago   77.8MB
[3] To enable Basic authentication, Configure like follows.
root@dlp:~#
apt -y install apache2-utils
root@dlp:~#
vi /etc/docker/registry/config.yml
# uncomment [auth] section and specify passwd file

.....
.....
auth:
  htpasswd:
    realm: basic-realm
    path: /etc/docker/registry/.htpasswd
.....
.....

root@dlp:~#
systemctl restart docker-registry
# add users
# add [-c] at initial file creation

root@dlp:~#
htpasswd -Bc /etc/docker/registry/.htpasswd debian

New password:
Re-type new password:
Adding password for user debian

# verify possible to access
# an error is shown if access with no-authentication

root@node01:~#
docker pull dlp.srv.world:5000/debian:my-registry

Error response from daemon: Head http://dlp.srv.world:5000/v2/nginx/manifests/my-registry: no basic auth credentials
# authenticate by a user added with [htpasswd]

root@node01:~#
docker login dlp.srv.world:5000

Username: debian
Password:
WARNING! Your password will be stored unencrypted in /root/.docker/config.json.
Configure a credential helper to remove this warning. See
https://docs.docker.com/engine/reference/commandline/login/#credentials-store

Login Succeeded
root@node01:~#
docker pull dlp.srv.world:5000/debian:my-registry

root@node01:~#
docker images

REPOSITORY                  TAG           IMAGE ID       CREATED      SIZE
dlp.srv.world:5000/debian   my-registry   2dc39ba059dc   6 days ago   77.8MB
[4] To access via HTTPS and use valid certificates like from Let's Encrypt and so on, Configure like follows.
This example is based on the environment that certificates have been gotten under the [/etc/letsencrypt/live/dlp.srv.world].
root@dlp:~#
mkdir /etc/docker/certs.d

root@dlp:~#
cp -p /etc/letsencrypt/live/dlp.srv.world/{fullchain,privkey}.pem /etc/docker/certs.d/

root@dlp:~#
chown docker-registry /etc/docker/certs.d/{fullchain,privkey}.pem

root@dlp:~#
vi /etc/docker/registry/config.yml
# add [tls] section under the [http] section like follows

.....
.....
http:
  addr: :5000
  tls:
    certificate: /etc/docker/certs.d/fullchain.pem
    key: /etc/docker/certs.d/privkey.pem
  headers:
    X-Content-Type-Options: [nosniff]
.....
.....

root@dlp:~#
systemctl restart docker-registry
# verify possible to access
# on HTTPS connection, it does not need to add [insecure-registries] on Docker

root@node01:~#
docker pull dlp.srv.world:5000/debian:my-registry

root@node01:~#
docker images

REPOSITORY                 TAG           IMAGE ID       CREATED       SIZE
debian                     latest        7e0aa2d69a15   2 weeks ago   72.7MB
dlp.srv.world:5000/debian  my-registry   62d49f9bab67   4 weeks ago   133MB
[5] To access via HTTPS and use self signed certificates, Configure like follows.
This example is based on the environment that certificates have been created under the [/etc/ssl/private].
root@dlp:~#
mkdir -p /etc/docker/certs.d/dlp.srv.world:5000

root@dlp:~#
cp -p /etc/ssl/private/server.{crt,key} /etc/docker/certs.d/dlp.srv.world:5000/

root@dlp:~#
chown docker-registry /etc/docker/certs.d/dlp.srv.world:5000/server.{crt,key}

root@dlp:~#
vi /etc/docker/registry/config.yml
# add [tls] section under the [http] section like follows

.....
.....
http:
  addr: :5000
  tls:
    certificate: /etc/docker/certs.d/dlp.srv.world:5000/server.crt
    key: /etc/docker/certs.d/dlp.srv.world:5000/server.key
  headers:
    X-Content-Type-Options: [nosniff]
.....
.....

root@dlp:~#
systemctl restart docker-registry
# verify possible to access
# an error is shown because of self signed certificate

root@node01:~#
docker pull dlp.srv.world:5000/debian:my-registry

Error response from daemon: Get https://dlp.srv.world:5000/v2/: x509: certificate signed by unknown authority
# copy certificate on registry server to client

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

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

root@node01:~#
docker pull dlp.srv.world:5000/debian:my-registry

root@node01:~#
docker images

REPOSITORY                 TAG           IMAGE ID       CREATED       SIZE
debian                     latest        7e0aa2d69a15   2 weeks ago   72.7MB
dlp.srv.world:5000/debian  my-registry   62d49f9bab67   4 weeks ago   133MB
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