How to disable “Cannot Render Console from…” on Rails

Question

I\'m using Ubuntu/vagrant as my development environment. I\'m getting these messages on rails console:

Started GET \"/assets/home-fcec5b5a277ac7c20cc9f45a209         


        

Answer 1

Anyone on any of my private networks is welcome.

I run in a docker container and I don't care which network it wants to use this week.

config/environments/development.rb add line

config.web_console.whitelisted_ips = ['10.0.0.0/8', '172.16.0.0/12', '192.168.0.0/16']

Answer 2

class Application < Rails::Application
  config.web_console.whitelisted_ips = %w( 0.0.0.0/0 ::/0 )
end

Answer 3

If you run your site locally (on the host) it generally works out, since 127.0.0.1 is always permitted. But if you're going to put your site into a container (not in production, locally), you might want to add this into config/environments/development.rb:

require 'socket'
require 'ipaddr'
Rails.application.configure do
  ...
  config.web_console.permissions = Socket.getifaddrs
    .select { |ifa| ifa.addr.ipv4_private? }
    .map { |ifa| IPAddr.new(ifa.addr.ip_address + '/' + ifa.netmask.ip_address) }
  ...
end

P.S. Most of the time you want it to whine (don't want to do config.web_console.whiny_requests = false). Because it might mean you're running web-console in production (which you shouldn't do).

Answer 4

For development environment: Detect if it's docker, then determine the IP address and whitelist it

# config/environments/development.rb
require 'socket'
require 'ipaddr'

Rails.application.configure do
  ...

  # When inside a docker container
  if File.file?('/.dockerenv')
    # Whitelist docker ip for web console
    # Cannot render console from 172.27.0.1! Allowed networks: 127.0.0.1
    Socket.ip_address_list.each do |addrinfo|
      next unless addrinfo.ipv4?
      next if addrinfo.ip_address == "127.0.0.1" # Already whitelisted

      ip = IPAddr.new(addrinfo.ip_address).mask(24)

      Logger.new(STDOUT).info "Adding #{ip.inspect} to config.web_console.whitelisted_ips"

      config.web_console.whitelisted_ips << ip
    end
  end
end

For me this prints the following and the warning goes away

Answer 5

If you want to stop seeing this error message you can add this line in development.rb

config.web_console.whiny_requests = false