Config docker behind proxy on CentOS 7

After install docker need to add ca certificate to CentOS 7 copy ca certificates into

after than use follow command to update certificates
# update-ca-trust

now add proxy settings into docker config file /etc/sysconfig/docker as follow

for sudo without password add row indo /etc/sudoers
[USER] ALL=(ALL) NOPASSWD: /usr/bin/docker

configure docker engine to start at boot:
systemctl enable docker
systemctl restart docker