mirror of
https://github.com/fradelg/docker-mysql-cron-backup.git
synced 2024-11-01 08:31:45 +01:00
62 lines
2.7 KiB
Bash
Executable file
62 lines
2.7 KiB
Bash
Executable file
#!/bin/bash
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# Get hostname: try read from file, else get from env
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[ -z "${MYSQL_HOST_FILE}" ] || { MYSQL_USER=$(head -1 "${MYSQL_HOST_FILE}"); }
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[ -z "${MYSQL_HOST}" ] && { echo "=> MYSQL_HOST cannot be empty" && exit 1; }
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# Get username: try read from file, else get from env
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[ -z "${MYSQL_USER_FILE}" ] || { MYSQL_USER=$(head -1 "${MYSQL_USER_FILE}"); }
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[ -z "${MYSQL_USER}" ] && { echo "=> MYSQL_USER cannot be empty" && exit 1; }
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# Get password: try read from file, else get from env, else get from MYSQL_PASSWORD env
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[ -z "${MYSQL_PASS_FILE}" ] || { MYSQL_PASS=$(head -1 "${MYSQL_PASS_FILE}"); }
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[ -z "${MYSQL_PASS:=$MYSQL_PASSWORD}" ] && { echo "=> MYSQL_PASS cannot be empty" && exit 1; }
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# Get database name(s): try read from file, else get from env
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# Note: when from file, there can be one database name per line in that file
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[ -z "${MYSQL_DATABASE_FILE}" ] || { MYSQL_DATABASE=$(cat "${MYSQL_DATABASE_FILE}"); }
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# Get level from env, else use 6
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[ -z "${GZIP_LEVEL}" ] && { GZIP_LEVEL=6; }
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DATE=$(date +%Y%m%d%H%M)
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echo "=> Backup started at $(date "+%Y-%m-%d %H:%M:%S")"
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DATABASES=${MYSQL_DATABASE:-${MYSQL_DB:-$(mysql -h "$MYSQL_HOST" -P "$MYSQL_PORT" -u "$MYSQL_USER" -p"$MYSQL_PASS" $MYSQL_SSL_OPTS -e "SHOW DATABASES;" | tr -d "| " | grep -v Database)}}
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for db in ${DATABASES}
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do
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if [[ "$db" != "information_schema" ]] \
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&& [[ "$db" != "performance_schema" ]] \
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&& [[ "$db" != "mysql" ]] \
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&& [[ "$db" != "sys" ]] \
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&& [[ "$db" != _* ]]
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then
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echo "==> Dumping database: $db"
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FILENAME=/backup/$DATE.$db.sql
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LATEST=/backup/latest.$db.sql
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if mysqldump --single-transaction $MYSQLDUMP_OPTS -h "$MYSQL_HOST" -P "$MYSQL_PORT" -u "$MYSQL_USER" -p"$MYSQL_PASS" $MYSQL_SSL_OPTS "$db" > "$FILENAME"
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then
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EXT=
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if [ -z "${USE_PLAIN_SQL}" ]
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then
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echo "==> Compressing $db with LEVEL $GZIP_LEVEL"
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gzip "-$GZIP_LEVEL" -f "$FILENAME"
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EXT=.gz
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FILENAME=$FILENAME$EXT
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LATEST=$LATEST$EXT
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fi
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BASENAME=$(basename "$FILENAME")
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echo "==> Creating symlink to latest backup: $BASENAME"
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rm "$LATEST" 2> /dev/null
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cd /backup || exit && ln -s "$BASENAME" "$(basename "$LATEST")"
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if [ -n "$MAX_BACKUPS" ]
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then
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while [ "$(find /backup -maxdepth 1 -name "*.$db.sql$EXT" -type f | wc -l)" -gt "$MAX_BACKUPS" ]
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do
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TARGET=$(find /backup -maxdepth 1 -name "*.$db.sql$EXT" -type f | sort | head -n 1)
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echo "==> Max number of ($MAX_BACKUPS) backups reached. Deleting ${TARGET} ..."
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rm -rf "${TARGET}"
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echo "==> Backup ${TARGET} deleted"
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done
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fi
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else
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rm -rf "$FILENAME"
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fi
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fi
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done
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echo "=> Backup process finished at $(date "+%Y-%m-%d %H:%M:%S")"
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