问题：执行./create_db_devel.sh -u postgres创建数据库时出错
描述：
[root@localhost dbscripts]# ./create_db_devel.sh -u postgres
/home/wqx/tf-git-repo/ovirt-engine-local/backend/manager/dbscripts /home/wqx/tf-git-repo/ovirt-engine-local/backend/manager/dbscripts
Running original create_db script...
/home/wqx/tf-git-repo/ovirt-engine-local/backend/manager/dbscripts /home/wqx/tf-git-repo/ovirt-engine-local/backend/manager/dbscripts
Creating the database: engine
dropdb: could not connect to database postgres: could not connect to server: Connection refused
Is the server running on host "localhost" and accepting
TCP/IP connections on port ?
could not connect to server: Connection refused
Is the server running on host "localhost" and accepting
TCP/IP connections on port ?
could not connect to server: Connection refused
Is the server running on host "localhost" and accepting
TCP/IP connections on port ?
createdb: could not connect to database postgres: could not connect to server: Connection refused
Is the server running on host "localhost" and accepting
TCP/IP connections on port ?
could not connect to server: Connection refused
Is the server running on host "localhost" and accepting
TCP/IP connections on port ?
could not connect to server: Connection refused
Is the server running on host "localhost" and accepting
TCP/IP connections on port ?
Failed to create database engine
/home/wqx/tf-git-repo/ovirt-engine-local/backend/manager/dbscripts
Failed to create database engine
/home/wqx/tf-git-repo/ovirt-engine-local/backend/manager/dbscripts
解决方法：重启数据库 service postgresql restart