修改表
UPDATE vm_instance SET private_ip_address ='10.168.8.88' WHERE instance_name = 'i-2-71-VM';
UPDATE nics AS n,vm_instance AS v SET n.ip4_address ='10.168.8.88',n.gateway='10.168.8.1' WHERE n.instance_id= v.id AND v.instance_name='i-2-71-VM';
重新启动VM，要stop，在start
