119 lines
4.1 KiB
Bash
Executable File
119 lines
4.1 KiB
Bash
Executable File
#!/bin/sh
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# Purpose {{{
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## Backup data of a Docker container.
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## To do that, the script will :
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## Try to stop the corresponding systemd unit (or docker if no related service is found)
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## Make a archive of the container's data to a backup path
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## Restart the container service (or docker.service)
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## Clean old backup
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# }}}
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# How-to use {{{
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## First argument should be the absolut path to the container's data.
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## The data directory and the container should have the same name.
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# }}}
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# Vars {{{
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DEBUG=1
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## Nomber of backup to keep
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keep_backup="3"
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## Manage arguments {{{
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## Expect at least 1 argument and 2 maximum
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case $# in
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1 )
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## Absolut path to the container data
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ct_data_path="${1}"
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## Absolut path to store the archives.
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## A sub-directory will be created for the container
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docker_backup_path="/mnt/backup/docker"
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;;
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2 )
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ct_data_path="${1}"
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docker_backup_path="${2}"
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;;
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* )
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cat << HELP
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container.backup --
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Backup data of a given Docker container.
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EXAMPLE :
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- Backup data of FIRST_CT container require the absolut path to data
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container.backup /srv/docker/FIRST_CT
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- Select the directory to store the backup of hello_world container
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container.backup /srv/docker/hello_world /media/usb/docker.backup
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HELP
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exit 1
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;;
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esac
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ct_name=$(basename -- "${ct_data_path}")
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docker_data_path=$(dirname -- "${ct_data_path}")
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ct_backup_path="${docker_backup_path}/${ct_name}"
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## }}}
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# }}}
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# Tests {{{
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## Ensure container data directory exists {{{
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if [ ! -d "${ct_data_path}" ]; then
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printf '\e[0;31m%-6s\e[m\n' "Docker data directory doesn't seems available : ${ct_data_path} ."
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exit 1
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else
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[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "DEBUG : Test arg — Path to Docker data : ${ct_data_path} ."
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[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "DEBUG : Test arg — Container name to backup : ${ct_name} ."
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fi
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## }}}
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## Ensure backup directory exists {{{
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if [ ! -d "${docker_backup_path}" ]; then
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printf '\e[0;31m%-6s\e[m\n' "Backup directory doesn't seems available : ${docker_backup_path} ."
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exit 1
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else
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[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "DEBUG : Test arg — Path to store the backup : ${docker_backup_path} ."
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fi
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## }}}
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# }}}
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# Get container service name {{{
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ct_service_name=$(find /etc/systemd -type f -iname "*${ct_name}*.service" -printf "%f\n")
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## If no specific systemd service exists, the docker.service will be used
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if [ "${ct_service_name}" = "" ]; then
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ct_service_name="docker.service"
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[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "DEBUG : Service name — No specific service found for ${ct_name} container, the ${ct_service_name} will be stopped."
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else
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[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "DEBUG : Service name — Service name of ${ct_name} container to stop : ${ct_service_name} ."
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fi
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# }}}
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# Stop the container service {{{
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systemctl stop "${ct_service_name}"
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[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "DEBUG : Service management — Service ${ct_service_name} was stopped."
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# }}}
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# Backup container data {{{
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## Create the directory to store archive if doesn't already exist
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if [ ! -d "${ct_backup_path}" ]; then
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mkdir -p -- "${ct_backup_path}"
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[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "DEBUG : Backup data — ${ct_backup_path} was created."
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fi
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## Backup container data
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tar czf "${ct_backup_path}/${ct_name}-backup.$(date '+%Y%m%d-%H%M').tar.gz" --directory "${docker_data_path}" "${ct_name}"
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[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "DEBUG : Backup data — Data of ${ct_name} container were successfully backuped ${ct_backup_path}/${ct_name}-backup.$(date '+%Y%m%d-%H%M').tar.gz"
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# }}}
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# Restart the container service {{{
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systemctl start "${ct_service_name}"
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[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "DEBUG : Service management — Service ${ct_service_name} was started."
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# }}}
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# Remove old backups {{{
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cd -- "${ct_backup_path}" || exit 1
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[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "DEBUG : Cleaning — Keep only the ${keep_backup} newest backups."
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find . -type f | sort | head -n -"${keep_backup}" | xargs -d '\n' rm -f --
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cd -- - > /dev/null || exit 1
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# }}}
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exit 0
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