centos-exec

This proof of concept app is intended to demonstrate SSH Tunneling for Docker Containers running CentOS in Heroku. Prompted by https://gus.lightning.force.com/lightning/r/0D5B000000vWwrs/view

First clone the code

git clone https://github.com/danjrichards/centos-exec

Create Heroku App

heroku create

Creating app... done, ⬢ rocky-everglades-56640
https://rocky-everglades-56640.herokuapp.com/ | https://git.heroku.com/rocky-everglades-56640.git

NOTES

$HEROKU_EXEC_URL = https://exec-manager.heroku.com:443/api/v2/7e81ec1f-a7f0-413f-8c74-3fcab3c4469f which runs:

if ssh -V 2>&1 | grep -q -e '^OpenSSH_7\.2.*$' -e '^OpenSSH_6\.6.*$'; then
  echo "UsePrivilegeSeparation no" >> $HOME/.ssh/sshd_config
fi

and further down the script:

ssh -o ServerAliveInterval=30 -o ServerAliveCountMax=3 \
  -o StrictHostKeyChecking=no -i ${privateKey} \
  -p ${proxyPort} -R 0.0.0.0:0:localhost:${localPort} \
  -q -N ${proxyUser}@${proxyHost} > /dev/null 2>&1

The https://hub.docker.com/r/alfresco/alfresco-imagemagick image specifies an Entrypoint: "Entrypoint": [ "/bin/sh", "-c", "java $JAVA_OPTS -jar /usr/bin/alfresco-docker-imagemagick.jar" ],

Build Image

• docker build -t centos-exec .

Run locally

• docker container rm cexec && docker run --name cexec -p 2022:22 -p 8090:8090 centos-exec
• docker ps
• docker exec -it cexec /bin/bash
• docker stop cexec /bin/bash

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Scale Dynos (Optional)

heroku ps:scale web=1

Check Dynos are up

heroku ps -a <APP_NAME>

SSH into Dyno

heroku ps:exec --dyno=web.1 -a <APP_NAME>