错误：
[root@k8s-node-2 ~]# docker pull hello-world Using default tag: latest Error response from daemon: Get https://registry-1.docker.io/v2/: x509: certificate is valid for *.mars.sourcemap.com, mars.sourcemap.com, not registry-1.docker.io [root@k8s-node-2 ~]#
解决：
step0:
查看 本地是否安装 bind-utils yum list installed |grep bind-utils 安装 yum install bind-utils
step1:
[root@localhost ~]# dig auth.docker.io
; <<>> DiG 9.9.4-RedHat-9.9.4-73.el7_6 <<>> auth.docker.io
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 28936
;; flags: qr rd ra; QUERY: 1, ANSWER: 8, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4000
;; QUESTION SECTION:
;auth.docker.io. IN A
;; ANSWER SECTION:
auth.docker.io. 43 IN A 52.206.40.44
auth.docker.io. 43 IN A 52.22.67.152
auth.docker.io. 43 IN A 34.233.151.211
auth.docker.io. 43 IN A 54.175.43.85
auth.docker.io. 43 IN A 52.54.155.177
auth.docker.io. 43 IN A 52.22.201.61
auth.docker.io. 43 IN A 54.165.149.19
auth.docker.io. 43 IN A 52.70.175.131
step2:
echo '52.206.40.44 registry-1.docker.io auth.docker.io' >> /etc/hosts
step3: 问题解决
