Add first version of backup script

Author: roschaefer

scripts/README.md

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+# How to use the backup script
+
+The backup script is intended to be used as a cron job or as a single command from your laptop.
+It uses SSH tunneling to a remote host and dumps the mongo database on your machine.
+Therefore, a public SSH key needs to be copied to the remote machine.
+
+# Usage
+
+All parameters must be supplied as environment variables:
+
+| Name                  | required  |
+|-----------------------|-----------|
+| SSH\_USERNAME         | yes       |
+| SSH\_HOST             | yes       |
+| MONGODB\USERNAME      | yes       |
+| MONGODB\PASSWORD      | yes       |
+| MONGODB\_DATABASE     | yes       |
+| OUTPUT                |           |
+
+After exporting these environment variables to your bash, run:
+```
+./remote-dump.sh
+```
+

scripts/remote-dump.sh

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+#!/bin/bash
+
+for var in "SSH_USERNAME" "SSH_HOST" "MONGODB_USERNAME" "MONGODB_PASSWORD" "MONGODB_DATABASE"
+do
+  if [[ -z "${!var}" ]]; then
+    echo "${var} is undefined"
+    exit -1
+  fi
+done
+
+OUTPUT_FILE_NAME=${OUTPUT:-human-connection-dump}_$(date -I).archive
+
+echo "SSH_USERNAME             ${SSH_USERNAME}"
+echo "SSH_HOST                 ${SSH_HOST}"
+echo "MONGODB_USERNAME         ${MONGODB_USERNAME}"
+echo "MONGODB_PASSWORD         ${MONGODB_PASSWORD}"
+echo "MONGODB_DATABASE         ${MONGODB_DATABASE}"
+echo "OUTPUT_FILE_NAME         ${OUTPUT_FILE_NAME}"
+echo "-------------------------------------------------"
+
+ssh -M -S my-ctrl-socket -fnNT -L 27018:localhost:27017 -l ${SSH_USERNAME} ${SSH_HOST}
+mongodump --host localhost -d ${MONGODB_DATABASE} --port 27018 --username ${MONGODB_USERNAME} --password ${MONGODB_PASSWORD} --authenticationDatabase admin --gzip --archive=${OUTPUT_FILE_NAME}
+ssh -S my-ctrl-socket -O check -l ${SSH_USERNAME} ${SSH_HOST}
+ssh -S my-ctrl-socket -O exit  -l ${SSH_USERNAME} ${SSH_HOST}