在执行 docker run 操作的时候，一直报如下错误：
[root@etcd1 vagrant]# docker run --name redis-6379 -p 6379:6379 -d --rm daocloud.io/library/redis
9e3e4650004bfd68030ea23c4a1e300556721c516160464afe45554b2184c111
/usr/bin/docker-current: Error response from daemon: driver failed programming external connectivity on endpoint redis-6379 (78ec2496afe55876e51d8e062bb09a6fcda7f36e292b99ad902efc27c65aa555): exec: "docker-proxy": executable file not found in $PATH
[root@etcd1 vagrant]
