This is a bit of shell code to ensure that all Dockers and ProxMox VM's gets gracefully and timely shutdown before the host either reboots or shutdown. 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.
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/dockerThis 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 [email protected]
Enter password to Docker host and confirm the saving of the key
Test the connection from the Docker-less host cli:
ssh [email protected]You can pass one argument to the graceful script that commands the host itself after the Dockers and ProxMox VM's has shut down:
Reboot host after Dockers and ProxMox VM's has been shutdown
graceful rebootShutdown host after Dockers and ProxMox VM's has been shutdown
graceful stop