使用docker pull從映象倉庫拉取映象時報錯如下：
[[email protected] ~]# docker pull centos
Using default tag: latest
Trying to pull repository docker.io/library/centos ...
Get https://registry-1.docker.io/v2/library/centos/manifests/latest: Get https://auth.docker.io/token?scope=repository%3Alibrary%2Fcentos%3Apull&service=registry.docker.io: net/http: TLS handshake timeout

解決辦法：

[[email protected] ~]# yum install bind-utils                          // 安裝dig工具
[[email protected] ~]# dig @114.114.114.114 registry-1.docker.io

; <<>> DiG 9.9.4-RedHat-9.9.4-61.el7_5.1 <<>> @114.114.114.114 registry-1.docker.io
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 51198
;; 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.   31      IN      A       34.206.236.31
registry-1.docker.io.   31      IN      A       54.175.43.85
registry-1.docker.io.   31      IN      A       34.205.207.96
registry-1.docker.io.   31      IN      A       34.233.151.211
registry-1.docker.io.   31      IN      A       52.70.175.131
registry-1.docker.io.   31      IN      A       34.200.28.105
registry-1.docker.io.   31      IN      A       54.165.149.19
registry-1.docker.io.   31      IN      A       34.201.236.93

;; Query time: 10 msec
;; SERVER: 114.114.114.114#53(114.114.114.114)
;; WHEN: Wed Oct 31 11:18:55 CST 2018
;; MSG SIZE  rcvd: 177

選擇上面命令執行結果中的一組解析放到本機的/etc/hosts檔案裡做對映
[
 
[email protected] ~]# vim /etc/hosts
54.175.43.85    registry-1.docker.io

接著再進行docker pull映象下載操作
[[email protected] ~]# docker pull centos
Using default tag: latest
Trying to pull repository docker.io/library/centos ... 
latest: Pulling from docker.io/library/centos
aeb7866da422: Pull complete 
Digest: sha256:67dad89757a55bfdfabec8abd0e22f8c7c12a1856514726470228063ed86593b
Status: Downloaded newer image for docker.io/centos:latest

[
 
[email protected] ~]# docker images
REPOSITORY           TAG                 IMAGE ID            CREATED             SIZE
docker.io/centos     latest              75835a67d134        3 weeks ago         200 MB