docker拉取redis时，抛出以下错误：
[master@localhost ~]$ docker pull redis
Using default tag: latest
Error response from daemon: Get https://registry-1.docker.io/v2/library/redis/manifests/latest: net/http: TLS handshake timeout
以及：
[master@localhost ~]$ docker pull redis
Using default tag: latest
Error response from daemon: Get https://registry-1.docker.io/v2/library/redis/manifests/latest: Get https://auth.docker.io/token?scope=repository%3Alibrary%2Fredis%3Apull&service=registry.docker.io: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
看来是网络的问题，由于是新安装的docker，国内直接拉取docker hub上的images速度很慢，看来应该是没有配置加速的原因导致的，配置一个加速器，这里配置的是DaoCloud，使用命令：
curl -sSL https://get.daocloud.io/daotools/set_mirror.sh | sh -s http://f1361db2.m.daocloud.io
输出如下：
[master@localhost ~]$ curl -sSL https://get.daocloud.io/daotools/set_mirror.sh | sh -s http://f1361db2.m.daocloud.io
docker version >= 1.12
{"registry-mirrors": ["http://f1361db2.m.daocloud.io"]}
Success.
You need to restart docker to take effect: sudo systemctl restart docker
然后使用命令sudo systemctl restart docker重启docker服务，拉取Redis的Image
latest: Pulling from library/redis
fc7181108d40: Downloading [=================================================> ] 22.24MB/22.49MB
3e0ac67cad82: Download complete
6ee495cb7235: Download complete
9f7206d08b9d: Download complete
a8354ef8cccb: Waiting
53afb10d81c2: Download complete
打完收工，看来是网路问题，需要配置加速器