docker遇到超时

1. 直接通过docker拉取镜像遇到的问题：熟悉的timeout！！！

[root@localhost ~]# docker search mysql
INDEX       NAME                                                             DESCRIPTION                                     STARS     OFFICIAL   AUTOMATED
docker.io   docker.io/mysql                                                  MySQL is a widely used, open-source relati...   8073      [OK]
docker.io   docker.io/mariadb                                                MariaDB is a community-developed fork of M...   2733      [OK]
docker.io   docker.io/mysql/mysql-server                                     Optimized MySQL Server Docker images. Crea...   604                  [OK]
docker.io   docker.io/percona                                                Percona Server is a fork of the MySQL rela...   430       [OK]
docker.io   docker.io/zabbix/zabbix-server-mysql                             Zabbix Server with MySQL database support       187                  [OK]
docker.io   docker.io/hypriot/rpi-mysql                                      RPi-compatible Docker Image with Mysql          113
docker.io   docker.io/zabbix/zabbix-web-nginx-mysql                          Zabbix frontend based on Nginx web-server ...   98                   [OK]
docker.io   docker.io/centurylink/mysql                                      Image containing mysql. Optimized to be li...   60                   [OK]
docker.io   docker.io/centos/mysql-57-centos7                                MySQL 5.7 SQL database server                   51
docker.io   docker.io/1and1internet/ubuntu-16-nginx-php-phpmyadmin-mysql-5   ubuntu-16-nginx-php-phpmyadmin-mysql-5          50                   [OK]
docker.io   docker.io/mysql/mysql-cluster                                    Experimental MySQL Cluster Docker images. ...   44
docker.io   docker.io/tutum/mysql                                            Base docker image to run a MySQL database ...   31
docker.io   docker.io/zabbix/zabbix-web-apache-mysql                         Zabbix frontend based on Apache web-server...   27                   [OK]
docker.io   docker.io/bitnami/mysql                                          Bitnami MySQL Docker Image                      26                   [OK]
docker.io   docker.io/schickling/mysql-backup-s3                             Backup MySQL to S3 (supports periodic back...   26                   [OK]
docker.io   docker.io/zabbix/zabbix-proxy-mysql                              Zabbix proxy with MySQL database support        22                   [OK]
docker.io   docker.io/linuxserver/mysql                                      A Mysql container, brought to you by Linux...   20
docker.io   docker.io/centos/mysql-56-centos7                                MySQL 5.6 SQL database server                   13
docker.io   docker.io/circleci/mysql                                         MySQL is a widely used, open-source relati...   12
docker.io   docker.io/mysql/mysql-router                                     MySQL Router provides transparent routing ...   11
docker.io   docker.io/openshift/mysql-55-centos7                             DEPRECATED: A Centos7 based MySQL v5.5 ima...   6
docker.io   docker.io/jelastic/mysql                                         An image of the MySQL database server main...   1
docker.io   docker.io/ansibleplaybookbundle/mysql-apb                        An APB which deploys RHSCL MySQL                0                    [OK]
docker.io   docker.io/cloudposse/mysql                                       Improved `mysql` service with support for ...   0                    [OK]
docker.io   docker.io/widdpim/mysql-client                                   Dockerized MySQL Client (5.7) including Cu...   0                    [OK]
[root@localhost ~]# docker pull mysql
Using default tag: latest
Trying to pull repository docker.io/library/mysql ...
latest: Pulling from docker.io/library/mysql
27833a3ba0a5: Pull complete
864c283b3c4b: Pull complete
cea281b2278b: Pull complete
8f856c14f5af: Pull complete
9c4f38c23b6f: Pull complete
1b810e1751b3: Pull complete
5479aaef3d30: Pull complete
9667974ee097: Pull complete
4ebb5e7ad6ac: Retrying in 1 second
021bd5074e22: Download complete
cce70737c123: Download complete
544ff12e028f: Download complete
Get https://registry-1.docker.io/v2/library/mysql/blobs/sha256:4ebb5e7ad6ac739b0457381dabae8d7db6f8f8b4750f9140891d91bbc9433b3f: Get https://auth.docker.io/t
oken?scope=repository%3Alibrary%2Fmysql%3Apull&service=registry.docker.io: net/http: request canceled while waiting for connection (Client.Timeout exceeded w
hile awaiting headers)

2. 通过国内镜像daocloud.io/library库下载，下载速度快到感人！

[root@localhost ~]#  docker pull daocloud.io/library/centos:latest
Trying to pull repository daocloud.io/library/centos ...
latest: Pulling from daocloud.io/library/centos
a02a4930cb5d: Pull complete
Digest: sha256:365fc7f33107869dfcf2b3ba220ce0aa42e16d3f8e8b3c21d72af1ee622f0cf0
Status: Downloaded newer image for daocloud.io/library/centos:latest
[root@localhost ~]# docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
[root@localhost ~]# docker pull daocloud.io/library/mysql:5.7
Trying to pull repository daocloud.io/library/mysql ...
5.7: Pulling from daocloud.io/library/mysql
27833a3ba0a5: Pull complete
864c283b3c4b: Pull complete
cea281b2278b: Pull complete
8f856c14f5af: Pull complete
9c4f38c23b6f: Pull complete
1b810e1751b3: Pull complete
5479aaef3d30: Pull complete
0f1430d39d4f: Pull complete
2bc64c824b3f: Pull complete
b64ec62ca852: Pull complete
42323e351ef3: Pull complete
Digest: sha256:c7b264f4d61c1efdc3265299083cd6516c9ff45448766c766393065d4dc5d4f4
Status: Downloaded newer image for daocloud.io/library/mysql:5.7

需要注意的是：mysql镜像名的前缀不能忘记，否则报错！ 
完整的名字： daocloud.io/library/mysql:5.7

sysuygm@sysuygm:~$ docker run -p 3306:3306 --name mysql2 -e MYSQL_ROOT_PASSWORD=root -d mysql:5.7
Unable to find image 'mysql:5.7' locally

docker: Error response from daemon: Get https://registry-1.docker.io/v2/library/mysql/manifests/5.7: Get https://auth.docker.io/token?scope=repository%3Alibrary%2Fmysql%3Apull&service=registry.docker.io: net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers).
See 'docker run --help'.
sysuygm@sysuygm:~$ docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES

sysuygm@sysuygm:~$ docker run -it --net host daocloud.io/library/mysql:5.7 "sh"
# mysql -h127.0.0.1 -P3306 -uroot -proot
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 3
Server version: 5.7.20 MySQL Community Server (GPL)

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