解决Error response from daemon: Get https://registry-1.docker.io/v2/library/hello-world/manifests/

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昨天在使用docker 时，将 image 文件从仓库抓取到本地一直报错，经过尝试，终于得以解决。

错误信息如下：

[root@archlinux ~]# docker image pull library/hello-world 
Using default tag: latest 
Error response from daemon: Get [https://registry-1.docker.io/v2/library/hello-world/manifests/latest](https://registry-1.docker.io/v2/library/hello-world/manifests/latest): dial tcp 52.20.146.203:443: i/o timeout

或者：

> [root@archlinux quanxj]# docker image pull library/hello-world 
> Using default tag: latest 
> latest: Pulling from library/hello-world 
> ca4f61b1923c: Pull complete 
> error pulling image configuration: Get [https://registry-1.docker.io/v2/library/hello-world/blobs/sha256:f2a91732366c0332ccd7afd2a5c4ff2b9af81f549370f7a19acd460f87686bc7](https://registry-1.docker.io/v2/library/hello-world/blobs/sha256:f2a91732366c0332ccd7afd2a5c4ff2b9af81f549370f7a19acd460f87686bc7): dial tcp 35.169.231.249:443: i/o timeout

解决方法如下：

第一步：通过dig @114.114.114.114 registry-1.docker.io找到可用IP

> [root@archlinux ~]# dig @114.114.114.114 registry-1.docker.io 
> ; <<>> DiG 9.12.0 <<>> @114.114.114.114 registry-1.docker.io 
> ; (1 server found) 
> ;; global options: +cmd 
> ;; Got answer: 
> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 37534 
> ;; flags: qr rd ra; QUERY: 1, ANSWER: 8, AUTHORITY: 0, ADDITIONAL: 1 
> ;; OPT PSEUDOSECTION: 
> ; EDNS: version: 0, flags:; udp: 4096 
> ; COOKIE: 88f87a15f4ca45dc (echoed) 
> ;; QUESTION SECTION: 
> ;registry-1.docker.io. IN A 
> ;; ANSWER SECTION: 
> registry-1.docker.io. 30 IN A 34.200.28.105 
> registry-1.docker.io. 30 IN A 52.22.181.254 
> registry-1.docker.io. 30 IN A 35.169.231.249 
> registry-1.docker.io. 30 IN A 52.5.185.86 
> registry-1.docker.io. 30 IN A 54.164.230.151 
> registry-1.docker.io. 30 IN A 34.200.90.16 
> registry-1.docker.io. 30 IN A 52.20.146.203 
> registry-1.docker.io. 30 IN A 52.206.156.207 
> ;; Query time: 116 msec 
> ;; SERVER: 114.114.114.114#53(114.114.114.114) 
> ;; WHEN: 四 3月 08 09:27:12 CST 2018 
> ;; MSG SIZE rcvd: 189

第二步：尝试修改/etc/hosts强制docker.io相关的域名解析到其它可用IP

> vim /etc/hosts

添加一个可用IP：

52.5.185.86 registry-1.docker.io

保存之后重试:

> [root@archlinux quanxj]# docker image pull library/hello-world 
> Using default tag: latest 
> latest: Pulling from library/hello-world 
> ca4f61b1923c: Already exists 
> Digest: sha256:083de497cff944f969d8499ab94f07134c50bcf5e6b9559b27182d3fa80ce3f7 
> Status: Downloaded newer image for hello-world:latest

验证：

> [root@archlinux quanxj]# docker image ls 
> REPOSITORY TAG IMAGE ID CREATED SIZE 
> hello-world latest f2a91732366c 3 months ago 1.85kB

成功！

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