March 2017
Intermediate to advanced
290 pages
5h 35m
English
Content preview from Troubleshooting DockerBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Configuring DNS
Docker provides hostname and DNS configuration for each container without building a custom image. It overlays the /etc files inside the container with virtual files where it can write new information.
This can be seen by running the mount command inside the container. Containers receive the same /resolv.conf as of the host machine when they are created initially. If a host's /resolv.conf file is modified, it will be reflected in the container's /resolv.conf file only when the container is restarted.
In Docker, you can set the dns options in two ways:
- Using
docker run --dns=<ip-address> - In the Docker daemon file, add
DOCKER_OPTS="--dns ip-address"
Tip
You can also specify the search domain using --dns-search=<DOMAIN>.
The following diagram shows ...
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