show free disk in the volumes folder

show-db-size.sh

@@ -1,6 +1,12 @@
 #!/bin/bash
 
 date
-df -h / | awk 'NR==2 {print "Total: " $2, "Free: " $4}'
+vols_free=$(df -h /var/lib/docker/volumes | awk 'NR==2 {print $4}')
+root_free=$(df -h / | awk 'NR==2 {print $4}')
+if [[ "$vols_free" == "$root_free" ]]; then
+    echo "Free space in /var/lib/docker/volumes: $vols_free"
+else
+    echo "Free space in /var/lib/docker/volumes: $vols_free (note: root / free is $root_free)"
+fi
 
 find /var/lib/docker/volumes -maxdepth 1 -type d -name 'rpc_*' -exec du -shL {} \; | sort -rh | awk '{cmd="basename "$2; cmd | getline dir; close(cmd); sub(/^rpc_/, "", dir); print $1, dir}'