Docker-compose container using host DNS server

You don’t specify which environment you’re running docker-compose in e.g Mac, Windows or Unix, so it will depend a little bit on what changes are needed. You also don’t specify if you’re using the default bridge network in docker on a user created bridge network.

In either case, by default, Docker should try and map DNS resolution from the Docker Host into your containers. So if your Docker Host can resolve the private DNS addresses, then in theory your containers should be able to as well.

I’d recommend reading this official Docker DNS documentation as it is pretty reasonable. Here for the default Docker bridge network, here for user created bridge networks.

A slight gotcha is if you’re running using Docker for Mac, Docker Machine or Docker for Windows you need to remember that your Docker Host is actually the VM running on your machine and not the physical box itself, so you need to ensure that the VM has the correct DNS resolution options set. You will need to restart your containers for changes to DNS resolution to be picked up by them.

You can of course override all the default settings using docker-compose. It has full options for explicitly setting DNS servers, DNS search options etc. As an example:

version: 2
services:
 application:
  dns:
   - 8.8.8.8
   - 4.4.4.4
   - 192.168.9.45

You’ll find the documentation for those features here.

Related Posts:

  1. What does localhost:8080 mean?
  2. Docker: How to delete all local Docker images
  3. Docker: How to delete all local Docker images
  4. Is it possible to repeat or redistribute a Bluetooth signal? [closed]
  5. java.net.ConnectException: Connection refused
  6. How can you find out which process is listening on a TCP or UDP port on Windows?
  7. ssh: Could not resolve hostname [hostname]: nodename nor servname provided, or not known
  8. java.net.ConnectException :connection timed out: connect?
  9. What is the difference between a port and a socket?
  10. How to fix docker: Got permission denied issue
  11. Can’t connect to docker from docker-compose
  12. Does TCP send a SYN/ACK on every packet or only on the first connection?
  13. Docker error: invalid reference format: repository name must be lowercase
  14. Finding local IP addresses using Python’s stdlib
  15. UDP vs TCP, how much faster is it?
  16. Docker: How to clear the logs properly for a Docker container?
  17. Android check internet connection
  18. Docker hv-sock proxy (vsudd) is not reachable windows
  19. Docker compose, running containers in net:host
  20. How does IPv4 Subnetting Work?
  21. I’ve inherited a rat’s nest of cabling. What now?
  22. What is the difference between Unix sockets and TCP/IP sockets?
  23. Why couldn’t MAC addresses be used instead of IPv4|6 for networking? [closed]
  24. VirtualBox: How to set up networking so both host and guest can access internet and talk to each other
  25. How do VLANs work?
  26. What causes the ‘Connection Refused’ message?
  27. How does IPv6 subnetting work and how does it differ from IPv4 subnetting?
  28. Why do consoles sometimes hang forever when SSH connection breaks?
  29. Switching to IPv6 implies dropping NAT. Is that a good thing?
  30. How much network latency is “typical” for east – west coast USA?
  31. How do I find if there is a rogue DHCP server on my Network?
  32. Is X.Y.Z.0 a valid IP address?
  33. ssh tunnel refusing connections with “channel 2: open failed”
  34. How do I make a connection private on Windows Server 2012 R2
  35. Should network hardware be set to “autonegotiate” speeds or fixed speeds?
  36. What is “anycast” and how is it helpful?
  37. What happens when you plug two sides of a cable to a single networking device?
  38. How to reload default Mac OSX routing table without rebooting
  39. An existing connection was forcibly closed by the remote host
  40. How to fix “SSL certificate problem: self signed certificate in certificate chain” error?
  41. Docker: Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock
  42. How do I pass environment variables to Docker containers?
  43. My users get “net::err_name_not_resolved”
  44. Docker error : no space left on device
  45. Connect: Socket operation on non-socket
  46. Error “The input device is not a TTY”
  47. what is the multicast doing on 224.0.0.251?
  48. “OSError: [Errno 8] Exec format error” when trying to run simple flask app in a docker container
  49. “VBoxManage not found. Make sure VirtualBox is installed and VBoxManage is in the path”
  50. What is the difference between CMD and ENTRYPOINT in a Dockerfile?
  51. What is the difference between the ‘COPY’ and ‘ADD’ commands in a Dockerfile?
  52. How to uninstall Docker completely from a Mac?
  53. How to easily install and uninstall docker on MacOs
  54. Docker can’t connect to docker daemon
  55. Where are Docker images stored on the host machine?
  56. How to force Docker for a clean build of an image
  57. Will setting a multicast destination address to FFFF.FFFF.FFFF make it a broadcast?
  58. How do I resolve the “java.net.BindException: Address already in use: JVM_Bind” error?
  59. Best C/C++ Network Library
  60. Docker for Windows error: “Hardware assisted virtualization and data execution protection must be enabled in the BIOS”
  61. Docker: unable to prepare context: unable to evaluate symlinks in Dockerfile path: GetFileAttributesEx
  62. Why does “docker attach” hang?
  63. Running docker container : iptables: No chain/target/match by that name
  64. Change directory command in Docker?
  65. WP in Docker – cannot install plugin or upgrade WP
  66. WP Multisite development with Mamp Pro and wildcard subdomains, not really working for me
  67. How do you seamlessly switch hosting?
  68. Multiple WordPress sites with docker
  69. Using docker with wordpress, how to handle backups correctly?
  70. WordPress development using Docker – how to share directories? [closed]
  71. Alias domain to Multi-site installation in Apache
  72. Pointing SSL Enabled URL at Single WordPress Page
  73. Use single-site install and map entities to subdomains
  74. docker on windows 10 with VVV [closed]
  75. WPTerm ssh connection not working [closed]
  76. wp-admin remove part of the url
  77. The easiest way to migrate a wordpress website across servers
  78. WordPress docker with empty responses to HTTP requests
  79. IP addresses to block to stop WP auto-update?
  80. Developing on localhost remove “index.php”
  81. DNS – Change WordPress Site Name?
  82. Installing other applications alongside WordPress multisite and configuring dns routing
  83. wordpress domain setup with ec2 apache
  84. How to queue API requests with PHP in WordPress?
  85. WordPress docker page is missing VIRTUAL_HOST variable
  86. WordPress Redirects to a cancelled domain, need to change it but can’t get to the admin portal
  87. Fresh install redirects to www, breaking page loads
  88. Too many redirects error when change of base url
  89. Dockerized WordPress is having Nginx Proxy Issues
  90. Why is the server response time slowing my site down? [closed]
  91. Change URL when visiting wordpress site
  92. wp-admin keeps forwarding me to an old url
  93. Should I quit using Ifconfig?
  94. In Windows, using the command line, how do you check if a remote port is open?
  95. How to forcibly close a socket in TIME_WAIT?
  96. Can Mac OS X be run inside Docker? [closed]
  97. Is it possible to rerun kubernetes job?
  98. SSHFS mount that survives disconnect
  99. How to get TX/RX bytes without ifconfig?
  100. Setup existing WordPress site for local development and testing using docker

Leave a Comment

tech