Update README.md

README.md

@@ -7,7 +7,7 @@ Using Docker to construct your APT(Advanced Packaging Tools) mirror HTTP server.
 
 ```
 docker run -d \
-           -v /path/data:/var/www/html/ubuntu \
+           -v /path/data:/var/www/html/ \
            -p 8080:80 kongkrit/apt-mirror-http-server
 ```
 
@@ -17,7 +17,22 @@ docker run -d \
 ### More options with docker command
 
 * `-e MIRROR_URL=url`: to replace default URL (http://archive.ubuntu.com/ubuntu) - See [Ubuntu Mirrors](https://launchpad.net/ubuntu/+archivemirrors)
-* `-e RESYNC_PERIOD=timeout-value`: to set the resync period, default is 12 hours. To set the [TIMEOUT format description](http://www.cyberciti.biz/faq/linux-unix-sleep-bash-scripting/)
+* `-e TIMEOUT=timeout-value`: to set the resync period, default is 12 hours. To set the [TIMEOUT format description](http://www.cyberciti.biz/faq/linux-unix-sleep-bash-scripting/)
+* `-e PUID=userid`: set to a userid that can access the mounted volume (see note below)
+* `-e PGID=groupid`: set to a groupid that can access the mounted volume (see note below)
+
+### More on PUID and PGID from [linuxserver.io](https://hub.docker.com/r/linuxserver/duckdns)
+
+When using volumes (-v flags) permissions issues can arise between the host OS and the container, we avoid this issue by allowing you to specify the user `PUID` and group `PGID`.
+
+Ensure any volume directories on the host are owned by the same user you specify and any permissions issues will vanish like magic.
+
+In this instance `PUID=1000` and `PGID=1000`, to find yours use id user as below:
+
+  > $ id username
+  > uid=1000(dockeruser) gid=1000(dockergroup) groups=1000(dockergroup)
+  
+You only need to set the PUID and PGID variables if you are mounting the `/var/www/html` folder
 
 ## Changelog