woahbase/alpine-blynk repository overview

⁠Alpine-Blynk⁠

⁠Container for Alpine Linux + OpenJDK8 + Blynk Server

This image⁠ containerizes Blynk⁠ IOT server, a platform for visualizing/controlling microcontrollers like Arduino, RaspberryPi etc that use their library⁠, over the web, running under OpenJDK⁠ 8.*.*.

Based on Alpine Linux⁠ from my alpine-openjdk8⁠ image with the s6⁠ init system and GNU LibC overlayed⁠ in it.

Auto updated according to the Github⁠ releases.

The image is tagged respectively for the following architectures,

• armhf
• x86_64 (retagged as the latest )

armhf builds have embedded binfmt_misc support and contain the qemu-user-static⁠ binary that allows for running it also inside an x64 environment that has it.

⁠Get the Image

Pull the image for your architecture it's already available from Docker Hub.

# make pull
docker pull woahbase/alpine-blynk:x86_64

⁠Configuration defaults

• Blynk home is at /opt/blynk. User data is at /opt/blynk/data. Mount this directory in local to persist blynk configuration data.

• Default configurations for server and mail is provided right inside the Blynk home directory as /opt/blynk/server.properties and /opt/blynk/mail.properties. Edit or remount these files to use custom configurations.

• By default, Blynk binds to the following ports :

  • 7443: Administration UI HTTPS port
  • 8080: HTTP port
  • 8081: Web socket ssl/tls port
  • 8082: Web sockets plain tcp/ip port
  • 8441: Hardware ssl/tls port (for hardware that supports SSL/TLS sockets)
  • 8442: Hardware plain tcp/ip port
  • 8443: Application mutual ssl/tls port
  • 9443: HTTPS port

⁠Run

If you want to run images for other architectures, you will need to have binfmt support configured for your machine. multiarch⁠, has made it easy for us containing that into a docker container.

# make regbinfmt
docker run --rm --privileged multiarch/qemu-user-static:register --reset

Without the above, you can still run the image that is made for your architecture, e.g for an x86_64 machine..

This image already has a user alpine configured to drop privileges to the passed PUID/PGID which is ideal if its used to run in non-root mode. That way you only need to specify the values at runtime and pass the -u alpine if need be. (run id in your terminal to see your own PUID/PGID values.)

Running make starts the service.

# make
docker run --rm -it \
  --name docker_blynk --hostname blynk \
  -e PGID=1000 -e PUID=1000 \
  -p 7443:7443 -p 8080:8080 \
  -p 8081:8081 -p 8082:8082 \
  -p 8441:8441 -p 8442:8442 \
  -p 8443:8443 -p 9443:9443 \
  -v /etc/localtime:/etc/localtime:ro \
  woahbase/alpine-blynk:x86_64

Stop the container with a timeout, (defaults to 2 seconds)

# make stop
docker stop -t 2 docker_blynk

Removes the container, (always better to stop it first and -f only when needed most)

# make rm
docker rm -f docker_blynk

Restart the container with

# make restart
docker restart docker_blynk

⁠Shell access

Get a shell inside a already running container,

# make shell
docker exec -it docker_blynk /bin/bash

set user or login as root,

# make rshell
docker exec -u root -it docker_blynk /bin/bash

To check logs of a running container in real time

# make logs
docker logs -f docker_blynk

⁠Development

If you have the repository access, you can clone and build the image yourself for your own system, and can push after.

⁠Setup

Before you clone the repo⁠, you must have Git⁠, GNU make⁠, and Docker⁠ setup on the machine.

git clone https://github.com/woahbase/alpine-blynk
cd alpine-blynk

You can always skip installing make but you will have to type the whole docker commands then instead of using the sweet make targets.

⁠Build

You need to have binfmt_misc configured in your system to be able to build images for other architectures.

Otherwise to locally build the image for your system. [ARCH defaults to x86_64, need to be explicit when building for other architectures.]

# make ARCH=x86_64 build
# sets up binfmt if not x86_64
docker build --rm --compress --force-rm \
  --no-cache=true --pull \
  -f ./Dockerfile_x86_64 \
  --build-arg ARCH=x86_64 \
  --build-arg DOCKERSRC=alpine-openjdk8 \
  --build-arg USERNAME=woahbase \
  -t woahbase/alpine-blynk:x86_64 \
  .

To check if its working..

# make ARCH=x86_64 test
docker run --rm -it \
  --name docker_blynk --hostname blynk \
  -e PGID=1000 -e PUID=1000 \
  woahbase/alpine-blynk:x86_64 \
  sh -ec 'sleep 5; java -version; cat /opt/blynk/version'

And finally, if you have push access,

# make ARCH=x86_64 push
docker push woahbase/alpine-blynk:x86_64

⁠Maintenance

Sources at Github⁠. Built at Travis-CI.org⁠ (armhf / x64 builds). Images at Docker hub⁠. Metadata at Microbadger⁠.

Maintained by WOAHBase⁠.