Configure Docker on ubuntu under corporate proxy

gistfile1.txt

== Install
 
sudo apt-key adv --keyserver hkp://p80.pool.sks-keyservers.net:80 --keyserver-options http-proxy=localhost:3128 --recv-keys 58118E89F3A912897C070ADBF76221572C52609D
sudo apt-get install docker-ce

== Proxy config

sudo mkdir -p /etc/systemd/system/docker.service.d
sudo gedit /etc/systemd/system/docker.service.d/http-proxy.conf
[Service]
Environment="HTTP_PROXY=http://localhost:3128/" 

== Certificate

export certificado from: https://production.cloudflare.docker.com/

add .crt sufix, eg: remame file to 'docker.crt'

copy /usr/share/ca-certificates/:

sudo cp docker.crt /usr/share/ca-certificates/

sudo update-ca-certificates --fresh

sudo dpkg-reconfigure ca-certificates (don't forget to check imported cert)

== Run

docker run -it hello-world

Status: Downloaded newer image for hello-world:latest

Hello from Docker!