Docker Behind Proxy Network with Cntlm on Centos/RHEL

Cntlm Authentication Proxy for Docker.txt

Install and Configure Cntlm:
	1. Configure EPEL Repo and install cntlm
	   yum install cntlm
	3. Generate hashes for password-less configuration and add one of the values to /etc/cntlm.conf
	    cntlm -u <user>@<domain> -H
	3. vi /etc/cntlm.conf
		Username        <Username>
		Domain          <Domain>
		PassNTLMv2      BCB555F5BA8709B8186C2A813C47A4BD    # Only for user '<user>', domain '<domain>'
		Proxy           <ProxyServer>:<Port>
		Port		<Localport> #Default 3128
	4. service cntlmd start
	5. chkconfig cntlmd on

Install Proxy CA Certs:
	1. yum install ca-certificates
	2. update-ca-trust force-enable
	3. Copy the Your Proxy CA Cert to /etc/pki/ca-trust/source/anchors/
	4. update-ca-trust extract

Docker Proxy Settings
    i. systemd(RHEL7):
	a. cp /usr/lib/systemd/system/docker.service /etc/systemd/system/
	b. Add a line that sets the environment variable in the unit above the ExecStart command:
		Environment="HTTP_PROXY=http://127.0.0.1:<Localport>"
		Environment="HTTPS_PROXY=http://127.0.0.1:<Localport>"
	c. systemctl daemon-reload
	d. systemctl restart docker
     
     ii. init(RHEL6):
        a.  Add below lines in /etc/sysconfig/docker
		export http_proxy="http://127.0.0.1:3128/"
		export https_proxy="http://127.0.0.1:3128/"
	b. /etc/init.d/docker restart


Ref:	https://danielksan81.wordpress.com/2015/05/22/running-docker-behind-a-proxy/