Improved backup script

dev-scripts/backup-vols.sh

@@ -1,15 +1,55 @@
 #!/bin/bash
 
-# This may cause data corruption if your volumes are in active use!!
+# https://stackoverflow.com/questions/36273665/what-does-set-x-do
+set -x
 
-mkdir -p /backup-vols
+
+### STEP 1: turning off all services to avoid data corruption
+
+all_services=$(docker volume ls --quiet)
+for srv in $all_services
+do
+  echo "Service: $srv"
+  docker service scale $srv=0 -d
+done
+
+echo "Turning off all services..."
+echo "Waiting 10 seconds until all services are scaled to zero..."
+sleep 10
+
+
+
+
+
+### STEP 2: Creating the backup
+
+backup_directory=/backup-vols/$(date +%Y_%m_%d_%H_%M_%S)
+
+mkdir -p $backup_directory
 
 vols=$(docker volume ls --quiet)
 
-for vol in $vols
+for VOL_NAME_TO_BACKUP in $vols
 do
-  echo "Volume: $vol"
-  pathToMount=($(docker volume inspect $vol --format {{.Mountpoint}}))
-  tar -cf /backup-vols/$vol-$(date +%Y_%m_%d_%H_%M_%S).tar -C $pathToMount .
+  echo "Volume: $VOL_NAME_TO_BACKUP"
+  docker run -it --rm -v $VOL_NAME_TO_BACKUP:/volume -v $backup_directory:/backup alpine \
+    tar -cf /backup/$VOL_NAME_TO_BACKUP.tar -C /volume ./
   echo ================================
 done
+
+
+
+
+
+### STEP 3: turning on all services that we disabled in STEP 1
+
+echo "Turning on all services..."
+
+for srv in $all_services
+do
+  echo "Service: $srv"
+  docker service scale $srv=1 -d
+done
+
+
+set +x