Implementation

1. Create a local docker repository named docker-login 
2. Modify the VirtualHost entry with your details (replace all <value> - There are 15)
3. Apply the Apache configuration and restart Apache

  Listen <port#>
<VirtualHost *:<port#>>
    ProxyPreserveHost On

    ServerName <apache-server-name>
    ServerAdmin server@admin

    SSLEngine on
    SSLCertificateFile <cert-file-location>
    SSLCertificateKeyFile <cert-key-file-location>

    RewriteEngine on

    RewriteCond %{SERVER_PORT} (.*)
    RewriteRule (.*) - [E=my_server_port:%1]

    RewriteCond %{REQUEST_SCHEME} (.*)
    RewriteRule (.*) - [E=my_scheme:%1]

    RewriteCond %{HTTP_HOST} (.*)
    RewriteRule (.*) - [E=my_custom_host:%1]

    RewriteCond "%{REQUEST_URI}" "^/v2/(.*?)/"
    RewriteRule "^/v2/.*?/(.*)$" "/api/docker/%1/v2/$1" [PT,E=repo:%1]

    RewriteRule ^/v2/$ <art-URL>/artifactory/api/docker/docker-login/v2/ [P]
    RewriteRule ^/v2/token$ <art-URL>/artifactory/api/docker/docker-login/v2/token [P]

    RequestHeader set Host <apache-server-name>/%{repo}e
    RequestHeader set X-Forwarded-Port %{my_server_port}e
    RequestHeader set X-Forwarded-Proto %{my_scheme}e
    RequestHeader set X-Artifactory-Override-Base-Url %{my_scheme}e://<apache-server-name>:<port#>
    ProxyPassReverseCookiePath /artifactory /

    Header edit* Location "^https://<apache-server-name>/(.*?)/v2/(.*)$" "https://<apache-server-name>:<port#>/v2/$1/$2"
    ProxyRequests off
    ProxyPass / <art-URL>/artifactory/
    ProxyPassReverse / <art-URL>/artifactory/
</VirtualHost>  

Example (Proxy port: 5000, apache-server-name: jfrog-docker, art-URL: http://192.168.99.100:8081):
 

Listen 5000
<VirtualHost *:5000>
    ProxyPreserveHost On

    ServerName jfrog-docker.com
    ServerAdmin server@admin

    SSLEngine on
    SSLCertificateFile /etc/ssl/demo.pem
    SSLCertificateKeyFile /etc/ssl/demo.key


    RewriteEngine on

    RewriteCond %{SERVER_PORT} (.*)
    RewriteRule (.*) - [E=my_server_port:%1]

    RewriteCond %{REQUEST_SCHEME} (.*)
    RewriteRule (.*) - [E=my_scheme:%1]

    RewriteCond %{HTTP_HOST} (.*)
    RewriteRule (.*) - [E=my_custom_host:%1]

    RewriteCond "%{REQUEST_URI}" "^/v2/(.*?)/"
    RewriteRule "^/v2/.*?/(.*)$" "/api/docker/%1/v2/$1" [PT,E=repo:%1]

    RewriteRule ^/v2/$ http://192.168.99.100:8081/artifactory/api/docker/docker-login/v2/ [P]
    RewriteRule ^/v2/token$ http://192.168.99.100:8081/artifactory/api/docker/docker-login/v2/token [P]

    RequestHeader set Host jfrog-docker.com/%{repo}e
    RequestHeader set X-Forwarded-Port %{my_server_port}e
    RequestHeader set X-Forwarded-Proto %{my_scheme}e
    RequestHeader set X-Artifactory-Override-Base-Url %{my_scheme}e://jfrog-docker.com:5000
    ProxyPassReverseCookiePath /artifactory /

    Header edit* Location "^https://jfrog-docker.com/(.*?)/v2/(.*)$" "https://jfrog-docker.com:5000/v2/$1/$2"
    ProxyRequests off
    ProxyPass / http://192.168.99.100:8081/artifactory/
    ProxyPassReverse / http://192.168.99.100:8081/artifactory/
</VirtualHost>