Use a Data Volume Container rather than a local fs mount

Dockerfile

@@ -2,7 +2,6 @@
 # docker-version 1.8.2
 FROM ubuntu:15.04
 MAINTAINER Jim Myhrberg "[email protected]"
-
 ENV ZNC_VERSION 1.6.1
 
 RUN apt-get update \

Makefile

@@ -1,3 +1,5 @@
+USER=tronpaul
+
 build:
 	docker build -t ${USER}/znc .
 

README.md

@@ -6,8 +6,8 @@ Run the [ZNC][] IRC Bouncer in a Docker container.
 
 ## Prerequisites
 
-1. Install [Docker][].
-2. Make .znc folder: `mkdir $HOME/.znc`
+1. Install [Docker][]
+2. Make .znc container: `docker run -v /znc-data --name znc-data busybox echo Data-only container for znc`
 
 [Docker]: http://docker.io/
 
@@ -17,7 +17,7 @@ To retain your ZNC settings between runs, you'll most likely want to
 bind a directory from the host to `/znc-data` in the container. For
 example:
 
-    docker run -d -p 6667 -v $HOME/.znc:/znc-data jimeh/znc
+    docker run -d -p 6667 --volumes-from znc-data jimeh/znc
 
 This will download the image if needed, and create a default config file in
 your data directory unless you already have a config in place. The default
@@ -28,7 +28,7 @@ exposed:
 
 Or if you want to specify which port to map the default 6667 port to:
 
-    docker run -d -p 36667:6667 -v $HOME/.znc:/znc-data jimeh/znc
+    docker run -d -p 36667:6667 --volumes-from znc-data jimeh/znc
 
 Resulting in port 36667 on the host mapping to 6667 within the container.
 
@@ -60,13 +60,16 @@ down ZNC's startup with a few seconds.
 
 ZNC needs a data/config directory to run. Within the container it uses
 `/znc-data`, so to retain this data when shutting down a container, you should
-mount a directory from the host. Hence `-v $HOME/.znc:/znc-data` is part of
-the instructions above.
+use the volume from another persistent container. Hence `--volumes-from znc-data`
+is part of the instructions above.
 
-As ZNC needs to run as it's own user within the container, the directory will
-have it's ownership changed to UID 1000 (user) and GID 1000 (group). Meaning
-after the first run, you might need root access to manually modify the data
-directory.
+You'll want to periodically back up your znc data to the host fs:
+
+    docker run --volumes-from znc-data -v $(pwd):/backup ubuntu tar cvf /backup/backup.tar /znc-data
+
+And restore them later:
+
+    docker run --volumes-from znc-data -v $(pwd):/backup busybox tar xvf /backup/backup.tar
 
 
 ## Passing Custom Arguments to ZNC
@@ -78,7 +81,7 @@ script, the [start-znc][] script simply passes all arguments along to ZNC.
 
 For example, if you want to use the `--makepass` option, you would run:
 
-    docker run -i -t -v $HOME/.znc:/znc-data jimeh/znc --makepass
+    docker run -i -t --volumes-from znc-data jimeh/znc --makepass
 
 Make note of the use of `-i` and `-t` instead of `-d`. This attaches us to the
 container, so we can interact with ZNC's makepass process. With `-d` it would
@@ -90,4 +93,5 @@ simply run in the background.
 1. Follow Prerequisites above.
 2. Checkout source: `git clone https://github.com/jimeh/docker-znc.git && cd docker-znc`
 3. Build container: `sudo docker build -t $(whoami)/znc .`
-4. Run container: `sudo docker run -d -p 6667 -v $HOME/.znc:/znc-data $(whoami)/znc`
+4. Make data container: `sudo docker run -v /znc-data --name znc-data jimeh/znc echo Data-only container for znc`
+5. Run container: `sudo docker run -d -p 6667 --volumes-from znc-data $(whoami)/znc`

docker-entrypoint.sh

@@ -2,6 +2,7 @@
 
 # Options.
 DATADIR="/znc-data"
+DEFAULT_NICK="admin"
 
 # Build modules from source.
 if [ -d "${DATADIR}/modules" ]; then
@@ -24,7 +25,48 @@ fi
 # Create default config if it doesn't exist
 if [ ! -f "${DATADIR}/configs/znc.conf" ]; then
   mkdir -p "${DATADIR}/configs"
-  cp /znc.conf.default "${DATADIR}/configs/znc.conf"
+  cat <<EOF > ${DATADIR}/configs/znc.conf
+// WARNING
+//
+// Do NOT edit this file while ZNC is running!
+// Use webadmin or *controlpanel instead.
+//
+// Altering this file by hand will forfeit all support.
+//
+// But if you feel risky, you might want to read help on /znc saveconfig and /znc rehash.
+// Also check http://en.znc.in/wiki/Configuration
+
+Version = 1.6.1
+<Listener l>
+        Port = 6667
+        IPv4 = true
+        IPv6 = true
+        SSL = false
+</Listener>
+LoadModule = webadmin
+
+<User ${ZNC_USER:-admin}>
+        Pass       = ${ZNC_PASSWORD:-sha256#00793765305dfc3e7bba28267fe9d9e2c721ebef4e20f3a89720265a89ee6a4f#N!lgZM8S.HZ4zH?)vFoW#}
+        Admin      = true
+        Nick       = ${ZNC_NICK:=$DEFAULT_NICK}
+        AltNick    = ${ZNC_NICK:=$DEFAULT_NICK}_
+        Ident      = ${ZNC_NICK:=$DEFAULT_NICK}
+        RealName   = Got ZNC?
+        Buffer     = 50
+        AutoClearChanBuffer = true
+        ChanModes  = +stn
+
+        LoadModule = chansaver
+        LoadModule = controlpanel
+        LoadModule = perform
+</User>
+EOF
+
+fi
+
+# Create a pemfile if it doesn't exist
+if [ ! -f "${DATADIR}/znc.pem" ]; then
+  znc --datadir="$DATADIR" --makepem
 fi
 
 # Make sure $DATADIR is owned by znc user. This effects ownership of the