1.问题如下:

执行 

docker pull php:7.4-fpm

报错 Error response from daemon: Get "https://registry-1.docker.io/v2/": net/http

2.解决办法

2.1 修改docker的配置文件

-- 要用超管权限执行
sudo vim /etc/docker/daemon.json

2.2 将该配置填入

这个 JSON 配置是用于 Docker 镜像加速

{
	"registry-mirrors": [
	"https://docker.1panelproxy.com",
	"https://2a6bf1988cb6428c877f723ec7530dbc.mirror.swr.myhuaweicloud.com",
	"https://docker.m.daocloud.io",
	"https://hub-mirror.c.163.com",
	"https://mirror.baidubce.com",
	"https://your_preferred_mirror",
	"https://dockerhub.icu",
	"https://docker.registry.cyou",
	"https://docker-cf.registry.cyou",
	"https://dockercf.jsdelivr.fyi",
	"https://docker.jsdelivr.fyi",
	"https://dockertest.jsdelivr.fyi",
	"https://mirror.aliyuncs.com",
	"https://dockerproxy.com",
	"https://mirror.baidubce.com",
	"https://docker.m.daocloud.io",
	"https://docker.nju.edu.cn",
	"https://docker.mirrors.sjtug.sjtu.edu.cn",
	"https://docker.mirrors.ustc.edu.cn",
	"https://mirror.iscas.ac.cn",
	"https://docker.rainbond.cc"
	]
}

2.3 重新加载配置文件及docker服务

sudo systemctl daemon-reload 

2.4 重启docker

sudo systemctl restart docker

到这里就解决了，原文章为：Error response from daemon: Get “https://registry-1.docker.io/v2/“: net/http: request canceled报错-CSDN博客

感谢大佬!!!