docker异常：flag provided but not defined: -e

-e参数设置docker环境变量出错：

[root@master ~]# docker exec -it -e "CORE_PEER_MSPCONFIGPATH=/etc/hyperledger/msp/users/Admin@org1.example.com/msp" peer0.org1.example.com bash
flag provided but not defined: -e
See '/usr/bin/docker-current exec --help'.
[root@master ~]#

解决办法，先进入docker，再设置环境变量

[root@master ~]# docker exec -it peer0.org1.example.com bash
root@a179b5f98889:/opt/gopath/src/github.com/hyperledger/fabric#export CORE_PEER_MSPCONFIGPATH=/etc/hyperledger/msp/users/Admin@org1.example.com/msp