Docker 拉镜像无法访问 registry-x.docker.io 问题（Centos7）

> 本文由 [简悦 SimpRead](http://ksria.com/simpread/) 转码， 原文地址 [blog.csdn.net](https://blog.csdn.net/hahaxu/article/details/80522244)

[Docker](https://so.csdn.net/so/search?q=Docker&spm=1001.2101.3001.7020) 拉取镜像文件时，遇到错误

```
Get https://registry-1.docker.io/v2/: net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers)
```

可能是网络无法解决，解决办法有很多，本文介绍的使用修改 host 表方式，但并不代码您遇到问题的原因与我相同。

### 1、安装 bind-utils

```
yum install bind-utils
```

### 2、找出 registry-x.docker.io 可用的 ip

```
dig @114.114.114.114 registry-1.docker.io
```

```
[root@vm1 ~]# dig @114.114.114.114 registry-1.docker.io  
; <<>> DiG 9.9.4-RedHat-9.9.4-61.el7 <<>> @114.114.114.114 registry-1.docker.io  
; (1 server found)  
;; global options: +cmd  
;; Got answer:  
;; ->>[HEADER](https://so.csdn.net/so/search?q=HEADER&spm=1001.2101.3001.7020)<<- opcode: QUERY, status: NOERROR, id: 39101  
;; flags: qr rd ra; QUERY: 1, ANSWER: 8, AUTHORITY: 0, ADDITIONAL: 1  
;; OPT PSEUDOSECTION:  
; EDNS: version: 0, flags:; udp: 4096  
;; QUESTION SECTION:  
;registry-1.docker.io. IN A  
;; ANSWER SECTION:  
registry-1.docker.io. 35 IN A 52.22.181.254  
registry-1.docker.io. 35 IN A 52.204.202.231  
registry-1.docker.io. 35 IN A 34.200.90.16  
registry-1.docker.io. 35 IN A 54.164.230.151  
registry-1.docker.io. 35 IN A 34.205.207.96  
registry-1.docker.io. 35 IN A 35.169.231.249  
registry-1.docker.io. 35 IN A 54.152.209.167  
registry-1.docker.io. 35 IN A 34.200.28.105  
;; Query time: 13 msec  
;; SERVER: 114.114.114.114#53(114.114.114.114)  
;; WHEN: 三 5 月 30 23:51:27 EDT 2018  
;; MSG SIZE rcvd: 177

### 3、修改 host 表，添加可用 ip
```

```
vim /etc/hosts
```

```
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4  
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6

54.152.209.167 registry-1.docker.io
```
问题解决！