Integret scheduled mode for periodic backups

README.md

@@ -33,6 +33,8 @@ MySQL Backup tool, backup database to S3 or Object Storage
 | --path        |      | Set s3 path without file name. eg: /custom_path      |
 | --dbname        | -d     | Set database name      |
 | --port        | -p     | Set database port (default: 3306)      |
+| --mode     | -m     | Set timeout execution mode. default or scheduled (default: default)        |
+| --period     |      | Set crontab period for scheduled mode only. (default: "*/30 * * * *")        |
 | --timeout     | -t     | Set timeout (default: 60s)        |
 | --help        | -h     | Print this help message and exit   |
 | --version     | -V     | Print version information and exit |
@@ -156,6 +158,8 @@ Simple S3 backup usage
 bkup --operation backup --storage s3 --dbname mydatabase 
 ```
 ```yaml
+version: '3'
+services:
   mysql-bkup:
     image: jkaninda/mysql-bkup
     container_name: mysql-bkup
@@ -179,10 +183,64 @@ bkup --operation backup --storage s3 --dbname mydatabase
       - S3_ENDPOINT=${S3_ENDPOINT}
 
 ```
-## Run "docker run" from crontab
+## Run in Scheduled mode
 
-Make an automated backup (every night at 1).
+This tool can be run as CronJob in Kubernetes for a regular backup which makes deployment on Kubernetes easy as Kubernetes has CronJob resources.
+For Docker, you need to run it in scheduled mode by adding `--mode scheduled` flag and specify the periodical backup time by adding `--period "*/30 * * * *" flag.
 
+Make an automated backup on Docker
+
+## Syntax of crontab (field description)
+
+The syntax is:
+
+- 1: Minute (0-59)
+- 2: Hours (0-23)
+- 3: Day (0-31)
+- 4: Month (0-12 [12 == December])
+- 5: Day of the week(0-7 [7 or 0 == sunday])
+
+Easy to remember format:
+
+* * * * * command to be executed
+- - - - -
+| | | | |
+| | | | ----- Day of week (0 - 7) (Sunday=0 or 7)
+| | | ------- Month (1 - 12)
+| | --------- Day of month (1 - 31)
+| ----------- Hour (0 - 23)
+------------- Minute (0 - 59)
+
+## Example of scheduling mode
+
+> Docker run :
+
+```sh
+docker run --rm --name mysql-bkup -v $BACKUP_DIR:/backup/ -e "DB_HOST=$DB_HOST" -e "DB_USERNAME=$DB_USERNAME" -e "DB_PASSWORD=$DB_PASSWORD" jkaninda/mysql-bkup:latest  bkup --operation backup --dbname $DB_NAME --mode scheduled --period "*/30 * * * *"
+```
+
+> With Docker compose
+
+```yaml
+version: '3'
+services:
+  mysql-bkup:
+    image: jkaninda/mysql-bkup
+    container_name: mysql-bkup
+    command:
+      - /bin/sh
+      - -c
+      - bkup --operation backup --dbname database_name --mode scheduled --period "*/30 * * * *"
+    volumes:
+      - ./backup:/backup
+    environment:
+      - DB_PORT=3306
+      - DB_HOST=mariadb
+      - DB_USERNAME=mariadb
+      - DB_PASSWORD=password
+```
+
+## Manual
 > backup_script.sh
 
 ```sh
@@ -207,6 +265,7 @@ Your crontab looks like this:
 ```
 
 ## Kubernetes CronJob
+For Kubernetes you don't need to run it in scheduled mode.
 
 Simple Kubernetes CronJob usage:
 

src/docker/Dockerfile

@@ -16,7 +16,8 @@ ENV VERSION="1.0"
 
 RUN apt-get update -qq
 RUN apt-get install build-essential libcurl4-openssl-dev libxml2-dev mime-support -y
-RUN apt install s3fs mysql-client -y
+RUN apt install s3fs mysql-client supervisor cron -y
+
 # Clear cache
 RUN apt-get clean && rm -rf /var/lib/apt/lists/*
 
@@ -28,6 +29,8 @@ RUN chmod 777 /tmp/s3cache
 COPY src/mysql_bkup.sh /usr/local/bin/
 RUN chmod +x /usr/local/bin/mysql_bkup.sh
 
+ADD src/supervisord.conf /etc/supervisor/supervisord.conf
+
 RUN ln -s /usr/local/bin/mysql_bkup.sh /usr/local/bin/mysql_bkup
 RUN ln -s /usr/local/bin/mysql_bkup.sh /usr/local/bin/bkup
 

src/mysql_bkup.sh

@@ -1,5 +1,4 @@
 #!/usr/bin/env bash 
-
 set -e
 TIME=$(date +%Y%m%d_%H%M%S)
 MY_SQL_DUMP=/usr/bin/mysqldump
@@ -10,6 +9,8 @@ export STORAGE=local
 export STORAGE_PATH=/backup
 export S3_PATH=/mysql-bkup
 export TIMEOUT=60
+export EXECUTION_MODE="default"
+export SCHEDULE_PERIOD="*/30 * * * *"
 export FILE_COMPRESION=true
 usage_info()
 {
@@ -92,6 +93,16 @@ flags()
             [ $# = 0 ] && error "No database name specified"
             export DB_PORT="$1"
             shift;;
+        (-m|--mode)
+            shift
+            [ $# = 0 ] && error "No Scheduled mode specified"
+            export EXECUTION_MODE="$1"
+            shift;;
+        (--period)
+            shift
+            [ $# = 0 ] && error "No Scheduled period entered"
+            export SCHEDULE_PERIOD="$1"
+            shift;;
         (-t|--timeout)
             shift
             [ $# = 0 ] && error "No timeout specified"
@@ -177,8 +188,58 @@ else
 export STORAGE_PATH=/s3mnt$S3_PATH
 fi
 }
+create_crontab_script()
+{
+TASK=/usr/local/bin/backup_cron.sh
+touch $TASK
+if [ $STORAGE == 's3' ]
+then
+cat > "$TASK" <<EOF
+#!/usr/bin/env bash 
+set -e
+bkup --operation backup --dbname $DB_NAME --port $DB_PORT --storage s3 --path $S3_PATH 
+EOF
+else
+cat > "$TASK" <<EOF
+#!/usr/bin/env bash 
+set -e
+bkup --operation backup --dbname $DB_NAME --port $DB_PORT
+EOF
+fi
+
+chmod +x /usr/local/bin/backup_cron.sh
+ln -s /usr/local/bin/backup_cron.sh /usr/local/bin/backup_cron
+## Create crontab job
+CRON_JOB=/etc/cron.d/backup_cron
+touch $CRON_JOB
+cat > "$CRON_JOB" <<EOF
+$SCHEDULE_PERIOD root exec /bin/bash -c ". /run/supervisord.env; /usr/local/bin/backup_cron.sh >> /var/log/backup_cron.log"
+EOF
+chmod 0644 /etc/cron.d/*
+crontab /etc/cron.d/backup_cron
+}
+scheduled_mode()
+{
+  if [  $OPERATION == 'backup' ]
+  then
+     create_crontab_script
+     echo ""
+     echo "**********************************"
+     echo "     Starting MySQL Bkup...       "
+     echo "***********************************"
+     echo "Running in Scheduled mode"
+     echo "Execution period $SCHEDULE_PERIOD"
+    supervisord -c /etc/supervisor/supervisord.conf
+  else
+    echo "Scheduled mode supports only backup operation"
+    exit 1
+  fi
+}
+
 flags "$@"
 # ?
+if [  $EXECUTION_MODE == 'default' ]
+then
   if [  $OPERATION != 'backup' ]
   then
      if [ $STORAGE != 's3' ]
@@ -198,4 +259,11 @@ flags "$@"
          echo "Backup to s3 storage"
          s3_backup
       fi
-   fi
+   fi
+elif [  $EXECUTION_MODE == 'scheduled' ]
+then
+  scheduled_mode
+else
+echo "Error, unknow execution mode!"
+exit 1
+fi

src/supervisord.conf

@@ -0,0 +1,13 @@
+[supervisord]
+nodaemon=true
+user=root
+logfile=/var/log/supervisor/supervisord.log
+pidfile=/var/run/supervisord.pid
+
+[program:cron]
+command = /bin/bash -c "declare -p | grep -Ev '^declare -[[:alpha:]]*r' > /run/supervisord.env && /usr/sbin/cron -f -L 15"
+autostart=true
+autorestart=true
+user = root
+stderr_logfile=/var/log/cron.err.log
+stdout_logfile=/var/log/cron.out.log