Added command to backup all databases in docker containers

backup_docker_databases.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+for NAME in `dps | grep postgis | awk '{print $13}'`; 
+do 
+  # ensure we have the same version of pg_dump as on the server
+  # we dont know if we have 9.3 or 9.4 etc so try to copy both -one will win
+  docker cp $NAME:/usr/lib/postgresql/9.3/bin/pg_dump .
+  docker cp $NAME:/usr/lib/postgresql/9.4/bin/pg_dump .
+  HOST=`dipall | grep $NAME | awk '{ print $3 }'`; 
+  echo "$NAME $HOST"; 
+  PGPASSWORD=docker ./pg_dump -Fc -f PG_${NAME}_`date +%d-%B-%Y`.dmp -U docker -h $HOST gis; 
+done