Configure VM / docker with company proxy CNTLM

docker_setup.md

Docker

NOTE this is still in progress, currently these steps are not sufficient!

This is a description of how to set up Docker for Mac with the company proxy CNTLM to ensure Internet access is supported.

• first run ifconfig in the terminal, determine IP of en0 network adapter, e.g. inet 172.23.123.234.

Docker For Mac

• open Docker for Mac preferences (accessible from menu bar)
• select Proxies tab, select Manual Proxy Configuration and fill in the IP for both fields Web Server (HTTP) and Secure Web Server (HTTPS)
• Press Apply & Restart to restart Docker deamon.

CNTLM

This assumes CNTLM is running on 127.0.0.1:3128.

• edit the CNTLM configuration, e.g. cntlm.conf
• set entry Gateyway yes
• set entry Listen 0.0.0.0:3128

Vagrantfile

# put the following content into ~/.vagrant/Vagrantfile
# install plugin vagrant-proxyconf: vagrant plugin install vagrant-proxyconf

VAGRANTFILE_API_VERSION = "2"

def get_proxy_url
  # Doesn't support different proxies for different protocols at present
  host_proxy = ENV['http_proxy'] || ENV['HTTP_PROXY'] || ENV['https_proxy'] || ENV["HTTPS_PROXY"]
  if host_proxy
    uri = URI(host_proxy)
    if ['localhost', '127.0.0.1'].include? uri.host
      # 10.0.2.2 is the default vagrant gateway and should connect to the host OS.
      # Confirm this by running 'netstat -r' in the guest.
      host_proxy = host_proxy.sub(uri.host, '10.0.2.2')
    end
  end

  host_proxy
end

def configure_proxy(config)
  proxy_server = get_proxy_url
  if Vagrant.has_plugin?("vagrant-proxyconf") && proxy_server
    config.proxy.http     = proxy_server
    config.proxy.https    = proxy_server
    config.proxy.no_proxy = "localhost,127.0.0.1"
  else
    puts "Please install vagrant-proxyconf for internet access via local proxy"
  end
end

Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
  configure_proxy(config)
  config.ssh.forward_agent = true
end