update readme, fix some bugs

README.markdown

@@ -8,29 +8,49 @@ hostname) will go fast.
 
 # Levers
 
+## Paths
+
+The mirror stores all the data in a docker volume at path
+`/var/mirror/ubuntu`.  Map that somewhere else if you like.
+
 ## Environment Variables
 
-* `MIRROR_ARCHITECTURES`
+* `UBUNTU_MIRROR_ARCHITECTURES`
     * default `amd64`.
     * You may want `i386,amd64`.
-* `MIRROR_CATEGORIES`
+* `UBUNTU_MIRROR_CATEGORIES`
     * Default `main,universe,restricted,multiverse`. Will use lots of disk.
     * You may want `main,universe`.
 * `UBUNTU_MIRROR_PROJECTS`
     * Default
       `bionic,bionic-updates,bionic-security,bionic-backports,focal,focal-updates,focal-security,focal-backports`.
     * You may want only `focal,focal-updates,focal-security,focal-backports`.
-* `UBUNTU_MIRROR_SOURCE` - upstream server to mirror from
+* `UBUNTU_MIRROR_UPSTREAM` - upstream server to mirror from
     * default `archive.ubuntu.com`.
     * You may want `xx.archive.ubuntu.com` (where `xx` is your country
       code).
-* `UBUNTU_SOURCE_MIRROR` - do we want to mirror all the source code too?
+* `UBUNTU_ENABLE_SOURCE_MIRRORING` - do we want to mirror all the source code too?
     * Default ``
     * You may want `1` if you want to use up even more disk for your mirror
-* `MIRROR_INTERVAL_SECONDS` - mirror update interval
+* `MIRROR_UPDATE_INTERVAL_SECONDS` - mirror update interval
     * default `43200` (12h)
     * You may want `10800` (3h)
 
+# Example Startup
+
+```
+docker rm -f local-ubuntu-mirror
+docker run -d --name local-ubuntu-mirror \
+	-v /storage/mirrors/ubuntu:/var/mirror/ubuntu \
+    --env MIRROR_UPDATE_INTERVAL_SECONDS=3600 \
+    --env UBUNTU_MIRROR_ARCHITECTURES=amd64 \
+    --env UBUNTU_MIRROR_UPSTREAM=us.archive.ubuntu.com \
+    --env UBUNTU_MIRROR_PROJECTS=focal,focal-updates,focal-security,focal-backports \
+	-p 8080:80 \
+	--restart unless-stopped \
+	sneak/ubuntumirror:latest
+```
+
 # Example CapRover Definition File
 
 ```