This is a bit of shell code to ensure that all Dockers and ProxMox VM's gets gracefully and timely backed up, shut down or rebooted. The code is written for a Debian12 host that holds a ProxMox environment with multiple LXC containers and VM's. One of those LXC containers holds a Debian12 which in turn runs a Docker environment. File access between various containers and VM's are over NFS. This has been a bit problematic as some containers or VM's 'hangs' while trying to unmount NFS before shutdown.

To rectify that this script has been born.

This script also contains a function to send status updates to a Rocket.chat instance.

Installation:

The script uses the built in standard tools for a Debian 12 installation.

To be able to communicate with a container hosted docker environment you will also need to install the docker-cli tool: You only need the docker file, which can be run directly from its location. The script calls docker-cli from /usr/bin/docker. Use the commands below to download, unpack and drop it in place:

curl https://download.docker.com/linux/static/stable/x86_64/docker-26.0.2.tgz | tar xvz --directory /tmp && mv -v /tmp/docker/docker /usr/bin/docker && chmod +x /usr/bin/docker && rm -rf /tmp/docker

To be able to communicate with Rocket.chat you will also need to install this:

apt install python3-pip
pip install rocket-python

Run commands on remote Docker host with docker-cli

This is used to connect to another Docker host with docker-cli, without modifying your local Docker installation or when you don't have a local Docker installation. This script requires that you already added and confirmed a SSH public key to your Docker host for passwordless root access. From your Docker-less host run:

apt install ssh
ssh-keygen (Press enter twice to leave the passphrase empty)
ssh-copy-id -i ~/.ssh/id_rsa.pub root@x.x.x.x

Enter password to Docker host and confirm the saving of the key

Test the connection from the Docker-less host cli:
ssh root@x.x.x.x

Usage

You can pass two arguments to the graceful script. Valid inputs are; 'graceful [HOST,SERVICES,DOCKER,BACKUP] [reboot,stop,host,folders,all]'

Examples:

Reboot host after Dockers and ProxMox VM's has been shutdown

graceful HOST reboot

Shutdown host after Dockers and ProxMox VM's has been shutdown

graceful HOST stop

Backup host

graceful BACKUP host

Backup VM's

graceful BACKUP vm

Backup folders

graceful BACKUP folders

ToDo

Configurable shutdown order of Docker containers and ProxMox VM's

Add link to my instructions for installing a self-hosted Rocket.chat in a LXC container