已配置镜像加速，仍然提示Error response from daemon: Get https://registry-1.docker.io/v2/: net/http: request canc

[root@localhost mydata]# docker pull elasticsearch-head:5
Error response from daemon: Get https://registry-1.docker.io/v2/: net/http: request canceled (Client.Timeout exceeded while awaiting headers)

• 解决：
  配置镜像加速后重启。如果已经配置过了，那就直接重启vagrant,执行vagrant reload。