129 lines
4.2 KiB
Bash
129 lines
4.2 KiB
Bash
#!/usr/bin/env bash
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# =====================================================================
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# WebGIS Database Backup Script
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# Location: /opt/webgis-lohne/scripts/backup.sh (on Server)
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# Purpose: Creates compressed pg_dump Backups with daily/weekly/monthly
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# Rotation. Intended to be run via Cron.
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# =====================================================================
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# Safety Switches
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set -euo pipefail
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# Logs Error Messages
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trap 'echo "[$(date)] ERROR: Script failed at Line ${LINENO} with Exit Code $?."' ERR
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# ---------------------------------------------------------------------
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# Configuration
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# ---------------------------------------------------------------------
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DB_HOST="localhost"
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DB_PORT="5432"
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DB_NAME="webgis-db"
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DB_USER="webgis-db-admin"
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BACKUP_ROOT="/var/backups/webgis"
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BACKUP_DIR_DAILY="${BACKUP_ROOT}/daily"
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BACKUP_DIR_WEEKLY="${BACKUP_ROOT}/weekly"
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BACKUP_DIR_MONTHLY="${BACKUP_ROOT}/monthly"
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# Retention Periods in Days
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KEEP_DAILY=7
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KEEP_WEEKLY=28
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KEEP_MONTHLY=365
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# Minimum acceptable Backup File Size in Bytes
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# Valid Dumps of even empty Databases are several KBs
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MIN_BACKUP_SIZE=10000
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# Password is read from protected File
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# pg_dump honors the PGPASSFILE Environment Variable.
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export PGPASSFILE="/root/.pgpass_webgis"
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# ---------------------------------------------------------------------
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# Preflight Checks
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# ---------------------------------------------------------------------
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# Check pg_dump Availability
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if ! command -v pg_dump &> /dev/null; then
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echo "[$(date)] ERROR: pg_dump not found. Install postgresql-client."
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exit 1
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fi
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# Check Password File Existence and Permissions
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if [[ ! -f "${PGPASSFILE}" ]]; then
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echo "[$(date)] ERROR: Password File ${PGPASSFILE} not found."
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exit 1
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fi
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PGPASS_PERMS=$(stat -c "%a" "${PGPASSFILE}")
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if [[ "${PGPASS_PERMS}" != "600" ]]; then
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echo "[$(date)] ERROR: ${PGPASSFILE} has Permissions ${PGPASS_PERMS}, expected 600."
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exit 1
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fi
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# ---------------------------------------------------------------------
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# Preparation
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# ---------------------------------------------------------------------
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TIMESTAMP=$(date +"%Y-%m-%d_%H-%M-%S")
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DAY_OF_WEEK=$(date +"%u") # 1=Monday ... 7=Sunday
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DAY_OF_MONTH=$(date +"%d")
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mkdir -p "${BACKUP_DIR_DAILY}" "${BACKUP_DIR_WEEKLY}" "${BACKUP_DIR_MONTHLY}"
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# ---------------------------------------------------------------------
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# Create Daily Backup in compressed Custom Format
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# ---------------------------------------------------------------------
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DAILY_FILE="${BACKUP_DIR_DAILY}/webgis_${TIMESTAMP}.dump"
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echo "[$(date)] Starting daily Backup -> ${DAILY_FILE}"
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pg_dump \
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--host="${DB_HOST}" \
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--port="${DB_PORT}" \
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--username="${DB_USER}" \
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--format=custom \
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--compress=9 \
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--file="${DAILY_FILE}" \
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"${DB_NAME}"
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# Verify Backup File Size
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BACKUP_SIZE=$(stat -c "%s" "${DAILY_FILE}")
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if [[ "${BACKUP_SIZE}" -lt "${MIN_BACKUP_SIZE}" ]]; then
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echo "[$(date)] ERROR: Backup File is only ${BACKUP_SIZE} Bytes (Minimum: ${MIN_BACKUP_SIZE}). Dump probably corrupt."
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exit 1
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fi
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echo "[$(date)] Daily Backup complete (${BACKUP_SIZE} Bytes)."
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# ---------------------------------------------------------------------
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# Promote to Weekly Backup on Sundays
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# ---------------------------------------------------------------------
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if [[ "${DAY_OF_WEEK}" == "7" ]]; then
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cp "${DAILY_FILE}" "${BACKUP_DIR_WEEKLY}/webgis_${TIMESTAMP}.dump"
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echo "[$(date)] Promoted to weekly Backup."
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fi
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# ---------------------------------------------------------------------
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# Promote to Monthly Backup on the First of the Month
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# ---------------------------------------------------------------------
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if [[ "${DAY_OF_MONTH}" == "01" ]]; then
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cp "${DAILY_FILE}" "${BACKUP_DIR_MONTHLY}/webgis_${TIMESTAMP}.dump"
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echo "[$(date)] Promoted to monthly Backup."
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fi
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# ---------------------------------------------------------------------
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# Rotation: Delete Backups older than Retention Period
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# ---------------------------------------------------------------------
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find "${BACKUP_DIR_DAILY}" -name "*.dump" -mtime +${KEEP_DAILY} -delete
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find "${BACKUP_DIR_WEEKLY}" -name "*.dump" -mtime +${KEEP_WEEKLY} -delete
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find "${BACKUP_DIR_MONTHLY}" -name "*.dump" -mtime +${KEEP_MONTHLY} -delete
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echo "[$(date)] Backup Rotation complete." |