centos7部署Hyperledger Fabric e2e示例遇到的问题

到Chaincode is installed on remote peer PEER2
这一步为止是成功的。

接下来出现错误
Error: Error endorsing chaincode: rpc error: code = Unknown desc = Error starting container: Post http://unix.sock/containers/create?name=dev-peer0.org2.example.com-mycc-1.0: dial unix /host/var/run/docker.sock: connect: permission denied
请教大家,错误可能是什么导致的呢?

详见:http://blog.csdn.net/yezaihong1982/article/details/56012805