Add arm32 Dockerfile

Dockerfile

@@ -1,4 +1,8 @@
-FROM golang:1.11-stretch
+# Go base image
+ARG base=golang:1.11-stretch
+# Busybox base image
+ARG busybox_base=busybox:1-glibc
+FROM $base
 MAINTAINER Lars Gierth <lgierth@ipfs.io>
 
 # There is a copy of this Dockerfile called Dockerfile.fast,
@@ -22,6 +26,8 @@ RUN cd $SRC_DIR \
 # Get su-exec, a very minimal tool for dropping privileges,
 # and tini, a very minimal init daemon for containers
 ENV SUEXEC_VERSION v0.2
+# Tini executable filename
+ARG tini_executable=tini
 ENV TINI_VERSION v0.16.1
 RUN set -x \
   && cd /tmp \
@@ -30,14 +36,16 @@ RUN set -x \
   && git checkout -q $SUEXEC_VERSION \
   && make \
   && cd /tmp \
-  && wget -q -O tini https://github.com/krallin/tini/releases/download/$TINI_VERSION/tini \
+  && wget -q -O tini https://github.com/krallin/tini/releases/download/$TINI_VERSION/$tini_executable \
   && chmod +x tini
 
 # Get the TLS CA certificates, they're not provided by busybox.
 RUN apt-get update && apt-get install -y ca-certificates
 
 # Now comes the actual target image, which aims to be as small as possible.
-FROM busybox:1-glibc
+ARG busybox_base
+FROM ${busybox_base}
+#FROM arm32v7/busybox:1-glibc
 MAINTAINER Lars Gierth <lgierth@ipfs.io>
 
 # Get the ipfs binary, entrypoint script, and TLS CAs from the build container.
@@ -49,7 +57,8 @@ COPY --from=0 /tmp/tini /sbin/tini
 COPY --from=0 /etc/ssl/certs /etc/ssl/certs
 
 # This shared lib (part of glibc) doesn't seem to be included with busybox.
-COPY --from=0 /lib/x86_64-linux-gnu/libdl-2.24.so /lib/libdl.so.2
+ARG glibc_shared_lib_arch=x86_64-linux-gnu
+COPY --from=0 /lib/${glibc_shared_lib_arch}/libdl-2.24.so /lib/libdl.so.2
 
 # Swarm TCP; should be exposed to the public
 EXPOSE 4001

Dockerfile.fast

@@ -1,4 +1,7 @@
-FROM golang:1.11-stretch
+# Go base image
+ARG base=golang:1.11-stretch
+FROM $base
+FROM $base
 MAINTAINER Lars Gierth <lgierth@ipfs.io>
 
 # This is a copy of /Dockerfile,
@@ -34,6 +37,8 @@ RUN set -x \
 # Get su-exec, a very minimal tool for dropping privileges,
 # and tini, a very minimal init daemon for containers
 ENV SUEXEC_VERSION v0.2
+# Tini executable filename
+ARG tini_executable=tini
 ENV TINI_VERSION v0.16.1
 RUN set -x \
   && cd /tmp \
@@ -42,7 +47,7 @@ RUN set -x \
   && git checkout -q $SUEXEC_VERSION \
   && make \
   && cd /tmp \
-  && wget -q -O tini https://github.com/krallin/tini/releases/download/$TINI_VERSION/tini \
+  && wget -q -O tini https://github.com/krallin/tini/releases/download/$TINI_VERSION/$tini_executable \
   && chmod +x tini \
   && mv su-exec/su-exec tini /sbin/ # Install them
 

README.md

@@ -317,6 +317,48 @@ Stop the running container:
 
     docker stop ipfs_host
 
+### Building Docker images
+
+For other platforms such as ARM, you may need to build a docker image to run.
+
+The main Dockerfile takes the following args:
+- `base`: The base go image for the target platform
+- `busybox_base`: The busybox base image for the target platform
+- `tini_executable`: The tini executable path for the target platform
+- `glibc_shared_lib_arch`: The target platform shared lib for glibc supplementing busybox
+
+#### `base`
+Possible values:
+- `golang:1.10-stretch` (default)
+- `arm32v7/golang:1.10-stretch`
+
+#### `busybox_base`
+Possible values:
+- `busybox:1-glibc` (default)
+- `arm32v7/golang:1.10-stretch`
+
+#### `tini_executable`
+Possible values:
+- `tini` (default)
+- `tini-armhf`
+
+#### `glibc_shared_lib_arch`
+Possible values:
+- `x86_64-linux-gnu` (default)
+- `arm-linux-gnueabihf`
+
+#### Example Docker image build
+
+Building for x86 linux:
+```sh
+docker build . -f Dockerfile
+```
+
+Building for Raspberry Pi (arm32v7):
+```sh
+docker build . -f Dockerfile --build-arg base=arm32v7/golang:1.10-stretch --build-arg tini_executable=tini-armhf --build-arg 'busybox_base=arm32v7/busybox:1-glibc' --build-arg glibc_shared_lib_arch=arm-linux-gnueabihf
+```
+
 When starting a container running ipfs for the first time with an empty data directory, it will call `ipfs init` to initialize configuration files and generate a new keypair. At this time, you can choose which profile to apply using the `IPFS_PROFILE` environment variable:
 
     docker run -d --name ipfs_host -e IPFS_PROFILE=server -v $ipfs_staging:/export -v $ipfs_data:/data/ipfs -p 4001:4001 -p 127.0.0.1:8080:8080 -p 127.0.0.1:5001:5001 ipfs/go-ipfs:latest