Could not fetch/save url https://download.docker.com/linux/centos/docker-ce.repo to file /etc/yum.re

解决docker在代理下不能拉取镜像

解决方案

如下步骤执行即可，注意proxy的替换

#First, create a systemd drop-in directory for the Docker service:
mkdir /etc/systemd/system/docker.service.d
#Now create a file called /etc/systemd/system/docker.service.d/http-proxy.conf that adds the HTTP_PROXY environment variable:
# 换成自己的代理ip
[Service]
Environment="HTTP_PROXY=http://proxy.example:80/"
#If you have internal Docker registries that you need to contact without proxying you can specify them via the NO_PROXY environment variable:

Environment="HTTP_PROXY=http://proxy.example:80/"
Environment="NO_PROXY=localhost,127.0.0.0/8,docker-registry.somecorporation"

#Flush changes:
$ sudo systemctl daemon-reload

#Verify that the configuration has been loaded:
$ sudo systemctl show --property Environment docker
#output: Environment=HTTP_PROXY=http://proxy.example:80/

#Restart Docker:
$ sudo systemctl restart docker