彻底解决docker：docker: Get https://registry-1.docker.io/v2/: net/http: request canceled 报错
给docker服务配置一个代理
mkdir -p /etc/systemd/system/docker.service.d
touch /etc/systemd/system/docker.service.d/http-proxy.conf
vim /etc/systemd/system/docker.service.d/http-proxy.conf
[Service]
Environment="HTTP_PROXY=http://192.168.100.10:808/"
Environment="HTTPS_PROXY=http://192.168.100.10:808/"
Environment="NO_PROXY=localhost,127.0.0.1"
【注】HTTP_PROXY 用于代理访问 http 请求，HTTPS_PROXY 用于代理访问 https 请求，如果想某个 IP或域名不走代理则配置到 NO_PROXY中。
systemctl daemon-reload
systemctl restart docker
cat /etc/docker/daemon.json
{"registry-mirrors": ["https://ys4vhbmg.mirror.aliyuncs.com","https://docker.m.daocloud.io","https://docker.mirrors.ustc.edu.cn","http://hub-mirror.c.163.com","https://docker.1ms.run","https://docker.domys.cc","https://docker.imgdb.de","https://docker-0.unsee.tech","https://docker.hlmirror.com","https://cjie.eu.org","https://docker.m.daocloud.io","https://hub.rat.dev","https://docker.1panel.live","https://docker.rainbond.cc"]
}