[docker] move to alpine base image

813Mb => 29.5Mb

DOCKER/Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.7.4
+FROM alpine:3.5
 
 # This is the release of tendermint to pull in.
 ENV TM_VERSION 0.8.0
@@ -12,30 +12,31 @@ ENV DATA_ROOT /tendermint
 ENV TMROOT $DATA_ROOT
 
 # Set user right away for determinism
-RUN groupadd -r tmuser && \
-    useradd -r -s /bin/false -g tmuser tmuser
+RUN addgroup tmuser && \
+    adduser -S -G tmuser tmuser
 
 # Create directory for persistence and give our user ownership
 RUN mkdir -p $DATA_ROOT && \
     chown -R tmuser:tmuser $DATA_ROOT
 
-# TODO replace with downloading a binary (this will allow us to replace golang
-# base container with alpine|jessie - 600MB vs 50MB)
-RUN apt-get update && \
-    apt-get install -y --no-install-recommends \
-      git && \
-    rm -rf /var/lib/apt/lists/*
-RUN mkdir -p $GOPATH/src/github.com/tendermint/tendermint && \
-    cd $GOPATH/src/github.com/tendermint/tendermint && \
-    git clone https://github.com/tendermint/tendermint.git . && \
-    git fetch && \
-    git reset --hard v$TM_VERSION && \
-    make install
+# jq and curl used for extracting `pub_key` from private validator while
+# deploying tendermint with Kubernetes. It is nice to have bash so the users
+# could execute bash commands.
+RUN apk add --no-cache bash curl jq
+
+RUN apk add --no-cache openssl && \
+    wget https://s3-us-west-2.amazonaws.com/tendermint/${TM_VERSION}/tendermint_linux_amd64.zip && \
+    echo "83f6bd52055ebc93434a68263c6666a4de41e0e543d0b5a06ad461262c460f4c  tendermint_linux_amd64.zip" | sha256sum -c && \
+    unzip -d /bin tendermint_linux_amd64.zip && \
+    apk del openssl && \
+    rm -f tendermint_linux_amd64.zip
 
 # Expose the data directory as a volume since there's mutable state in there
 VOLUME $DATA_ROOT
 
+# p2p port
 EXPOSE 46656
+# rpc port
 EXPOSE 46657
 
 ENTRYPOINT ["tendermint"]