Question: Running the Database

[360disrupt]

I did follow your instructions and I was able to compile it and run the guestbook. I've seen that you build a docker container from it. It would be great if you could describe how to run it (and how to build a docker container out of it) in a way that it runs without the guestbook and listens to a specific port. E.g. after a debian package installation you can run it on a default port:

dbPath="/home/pi/app/mongodb_data"
mongod --dbpath "$dbPath" &

And store the data in /home/pi/app/mongodb_data.

[mattlord]

The container was built and pushed this way: $ git clone https://github.com/mattlord/mongo-embedded-sample.git $ cd mongo-embedded-sample $ sudo docker build -t mattalord/mongo-embedded-sample:armhf . $ sudo docker push mattalord/mongo-embedded-sample

MongoDB Embedded is a library that you link into your application -- in this case the example iot_guestbook app. You cannot run it as a separate binary and it has no network support.

Thank you for your interest!

[360disrupt]

Ok thank you, that makes things more clear.

To build a non embedded version would I just have to change the target to mongod instead of install-embedded-dev in step 5 of your tutorial (and would I need step 4)? Or is this a completely different story?

https://github.com/mongodb/mongo/wiki/Build-Mongodb-From-Source#building-with-scons

I never installed it before from scratch, I used this packages:

  yes | apt-get install g++ protobuf-compiler libprotobuf-dev libboost-dev curl m4 wget libssl-dev
  yes | apt-get install mongodb-server

Is there a difference in the embedded version or why can a newer version be run on the pi than 3.2, Wasn't there this problem with MongoDB and 32bit ARM?

[mattlord]

What's your primary goal? Is it e.g. to install and run standard MongoDB 4.0 on Debian 9/Stretch ARM64? I can then help you get there. :-)

[360disrupt]

Yes, I have a RPI3B+ with rasbian stretch.

My goal is to run a multi container app with a nodejs application in the backend which uses mongodb as a database. Currently, I have all running without docker and an old mongodb I installed with the package above. This is the setup I would like to get on my rpi.

version: "3"
services:
    watchtower:
        container_name: watchtower
        image: v2tec/watchtower
        env_file:
             - watchtower.env
        volumes:
            - /var/run/docker.sock:/var/run/docker.sock
            - /root/.docker/config.json:/config.json
        command: --interval 30
    mongo:
        container_name: mongo
        ports:
            - '27017:27017'
        volumes:
            - '/var/opt/im/docker/mongo/data:/data/db'
            - '/var/opt/im/docker/backup:/data/backup'
        image: mongo
    360disrupt_nodeapp:
        container_name: 360disrupt_nodeapp
        ports:
            - '8080:8080'
        env_file:
            - nodeapp.env
        depends_on:
            - "mongo"
        volumes:
            - '/var/opt/im/docker/logs:/data/logs'
            - '/var/opt/im/docker/backup:/data/backup'
        image: index.docker.io/360disrupt/360disrupt_nodeapp:latest
    360disrupt_gui:
        container_name: 360disrupt_gui
        ports:
           - '80:80'
        depends_on:
           - "360disrupt_core"
        image: index.docker.io/360disrupt/360disrupt_gui:latest

I want to expose the port of the mongo container and use it in my node container. I've done this on linux server but I didn't find a mongo 4.0 docker build for arm. Thus I anted to create my own.

[mattlord]

OK. I also have a Pi3b+: https://medium.com/@mattalord/embedded-mongodb-4-0-on-raspberry-pi-e50fd1d65e43

You could build MongoDB 4.0 directly on the device as I did there, just changing the SCons target from "install-embedded-{dev,test}" to "mongo mongod" or even "all". As you saw, we have general instructions on building from source here: https://github.com/mongodb/mongo/wiki/Build-Mongodb-From-Source

You can also cross-compile as I did here: https://github.com/mattlord/mongo-embedded-sample/blob/master/build-instructions.md

I would recommend doing the cross-compile as it will be so much faster.

[360disrupt]

Scons fails to build the DB with the error: Implicit Dependency src/mongo/libshell_core.so not found, needed by target ... Do you have any idea what I need to install additionally?

I just did the steps from the tutorial on a new virtual machine linux debian 9.6 stretch. I additionally installed pip, git, libcurl4-openssl-dev, libssl-dev

[mattlord]

It's hard to say much without knowing the specific scons invocation used, but I would start with this (removing all embedded specific notations): python ./buildscripts/scons.py CC=/usr/bin/arm-linux-gnueabihf-gcc CXX=/usr/bin/arm-linux-gnueabihf-g++ --disable-warnings-as-errors --ssl --lto --prefix=$INSTALL_DIR core install -j$(grep -c ^processor /proc/cpuinfo)

If you haven't already done so set the INSTALL_DIR environment variable to where you want the build artifacts to be placed. You can then -- after a successful build -- tar it all up and scp it over to the Pi. For example: export INSTALL_DIR=$HOME/mongodb-4.0.4-armhf && mkdir -p $INSTALL_DIR

Since you're just trying to build standard MongoDB Community 4.0, you can follow the general building from source instructions, but specifying the cross compilers as I did here using the CC and CXX variables.

I hope this helps! Let me know if you run into any snags.