Dockerfile update for node

Merged all process in one single RUN to save image space and also remove node user. Can not be used with rpi-alpine-base due to just-containers/s6-overlay#207

node/Dockerfile

@@ -1,24 +1,19 @@
-FROM kafebob/rpi-alpine:3.6
+FROM kafebob/rpi-alpine-base:3.6
+MAINTAINER Luis Toubes <[email protected]>
 
-ENV NVM_VERSION=v0.33.2 NODE_VERSION=v8.2.1 PROFILE=/home/node/.bashrc
+ENV NVM_VERSION=v0.33.2 NODE_VERSION=v8.2.1 PROFILE=/root/.bashrc
 
 RUN apk add --update --no-cache curl bash \
     ca-certificates openssl coreutils && \
     apk add --update --no-cache --virtual build-dependencies ncurses python2 \
     make gcc g++ libgcc linux-headers && \
-    addgroup -g 1000 node && \
-    adduser -u 1000 -G node -s /bin/bash -h /home/node -D node
-
-USER node   
-RUN cd /home/node && \
+    cd /root && \
     curl -o- https://raw.githubusercontent.com/creationix/nvm/$NVM_VERSION/install.sh | bash && \
     echo "#NVM Setup" >> $PROFILE && \
     echo 'export NVM_DIR="$HOME/.nvm"' >> $PROFILE && \
     echo '[ -s "$NVM_DIR/nvm.sh" ] && . "$NVM_DIR/nvm.sh"  # This loads nvm' >> $PROFILE && \
     source $PROFILE && \
     nvm install -s $NODE_VERSION --fully-static && \
-    rm -rf /home/node/.nvm/.cache/src/node-$NODE_VERSION
-
-USER root
-RUN apk del build-dependencies && \
+    rm -rf /root/.nvm/.cache/src/node-$NODE_VERSION && \
+    apk del build-dependencies && \
     rm -rf /tmp/* /var/cache/apk/*

node/README.md

@@ -0,0 +1,28 @@
+# Alpine Node Images
+
+## Node Image
+
+In order to build your own Node Image for your Raspberry Pi based on `gliderlabs/alpine`
+
+```
+git clone https://github.com/xcafebabe/gobstoppers.git && \
+cd gobstoppers/node && \
+sudo docker build -t kafebob/rpi-alpine-node:latest .
+```
+
+Be patient is going to take a while.
+
+By default is going to use as image name `kafebob/rpi-alpine-node` and as tag version `latest`
+
+You can change these names creating two environment variables
+
+```
+export IMAGE_VERSION=8.2.1  && \
+export IMAGE_NAME=kafebob/rpi-alpine-node
+```
+
+If you just want to use latest image available, pull a copy from DockerHub
+
+```
+sudo docker pull kafebob/rpi-alpine-node:latest
+```