snapshot_manager.sh

.gitlab-ci.yml

stages:
  - snapshot

create_snapshot:
  stage: snapshot
  image:
    name: amazon/aws-cli
    entrypoint: ["/bin/sh", "-c"]
  script:
    - bash ./snapshot_manager.sh new_snapshot
  only:
    - schedules

delete_old_snapshots:
  stage: snapshot
  image:
    name: amazon/aws-cli
    entrypoint: ["/bin/sh", "-c"]
  variables:
    MAX_AGE_SNAPSHOTS_IN_DAYS: "30"
  script:
    - bash ./snapshot_manager.sh delete_old_snapshots
  only:
    - schedules

Readme.md

Automatically create snapshots of Lightsail (AWS) instances. Less frequent (to save costs) and longer than the automation that lightsail offers.

snapshot_manager.sh

#!/bin/bash

set -euo pipefail

INSTANCE_NAME="${INSTANCE_NAME:-autosave2}"
MAX_AGE_SNAPSHOTS_IN_DAYS="${MAX_AGE_SNAPSHOTS_IN_DAYS:-30}"

function new_snapshot {
    aws lightsail create-instance-snapshot \
    --instance-snapshot-name "autosave_$(date +%Y%m%d)" \
    --instance-name "$INSTANCE_NAME"
}

function delete_old_snapshots {
    # Get the current date in seconds since the epoch
    current_date=$(date +%s)

    # List all snapshots for the instance and parse their names
    aws lightsail get-instance-snapshots \
        --query 'instanceSnapshots[?fromInstanceName==`'"$INSTANCE_NAME"'`].[name]' \
        --output text | while read -r snapshot_name; do

            # Check if the snapshot name matches the autosave_%Y%m%d format
            if [[ $snapshot_name =~ ^autosave_([0-9]{8})$ ]]; then
                snapshot_date="${BASH_REMATCH[1]}"
                # Convert snapshot_date from YYYYMMDD to Unix timestamp
                snapshot_date_ts=$(date -d "$snapshot_date" +%s)

                # Calculate the difference in days from the current date
                diff=$(($current_date - $snapshot_date_ts))
                days=$(($diff / 86400))

                if [ "$days" -gt "$MAX_AGE_SNAPSHOTS_IN_DAYS" ]; then
                    echo >&2 "Deleting snapshot: $snapshot_name, which is $days days old."
                    # Uncomment the following line to enable actual deletion
                    # aws lightsail delete-instance-snapshot --instance-snapshot-name "$snapshot_name"
                fi
            fi
    done
}

case "${1:-x}" in
    new_snapshot) new_snapshot ;;
    delete_old_snapshots) delete_old_snapshots ;;
    *)
        echo  >&2 "usage:"
        echo  >&2 "$0 new_snapshot|delete_old_snapshots"
esac