![docker ip address of another container docker ip address of another container](https://dzone.com/storage/temp/13498186-screen-shot-2020-05-21-at-44226-pm.png)
# DO NOT EDIT THIS FILE BY HAND - YOUR CHANGES WILL BE OVERWRITTEN # Dynamic nf(5) file for glibc resolver(3) generated by resolvconf(8) To see what the container is receiving, let’s examine the containers nf file: :~$ docker exec -t web8 more /etc/nf However – regardless of how it’s altered, it should always be the source of truth for how the system handles name resolution. In many cases it is altered automatically by configuration information in other places. In case you don’t know, the nf file is generally where you define a Linux system’s name resolution parameters.
Docker ip address of another container update#
At this point it’s safe to assume that the container is receiving some sort of intelligent update from the Docker host which provides it relevant information about the local DNS configuration. You’ll notice that we didn’t need to specify a fully qualified domain name in order to resolve the host name docker4 in the domain lab.lab. In addition, just like our Docker host, the container can also resolve local DNS records associated with the local domain lab.lab: :~$ docker exec web8 host docker4 has address 192.168.50.102 :~$ If we look at our local Docker host and run the same test, we should get similar results: :~$ host has address 216.58.216.196 It would appear that the container has the ability to resolve DNS names. To start with, let’s start a new container on our host docker1 and examine how the container handles name resolution: :~$ docker run -d -P -name=web8ĭ65baf205669c871d1216dc091edd1452a318b6522388e045c211344815c280a
![docker ip address of another container docker ip address of another container](https://imgs.developpaper.com/imgs/2019122009305721.png)
We’ll be altering name resolution settings on the host so you’ll need root level access. It is assumed that this host has Docker installed and that Docker is in its default configuration. In this recipe we’ll be demonstrating the configuration on a single Docker host. In this recipe, we’ll walk through how this is done and how you can verify that it’s working as expected. The mechanics used by Docker to achieve name resolution in a container are elegantly simple.
![docker ip address of another container docker ip address of another container](https://stackjava.com/wp-content/uploads/2019/06/docker-check-ip-1-768x299.png)
The result is that a spawned container can natively resolve anything that the Docker host itself can. Docker passes name resolution from the Docker host, directly into the container. While you might not realize it but Docker, by default, is providing your containers a means to do basic name resolution. (For more resources related to this topic, see here.) Verifying host based DNS configuration inside a container