Hey folks! I'm trying to inject some local host entries into the CoreDNS engine for my Kubernetes setup. I've crafted a YAML file to add these custom entries, which looks like this:
```
apiVersion: v1
kind: ConfigMap
metadata:
name: coredns-custom
namespace: kube-system
data:
# The key name can be anything, but must end with .override
local-containers.override: |
hosts {
192.168.12.6 oracle.fedora.local broker01.fedora.local broker02.fedora.local broker03.fedora.local oracle broker01 broker02 broker03
fallthrough
}
```
After creating this, I launched a Fedora container, but I can't seem to see those entries in the host table. It looks like the config map is expecting `/etc/coredns/custom/*.override`, and I'm not sure if what I've created matches that requirement.
I also tried adding a custom host block, but that caused DNS issues in the containers. I attempted to create a block for docker hosts similar to the node hosts, but that didn't persist either. All I want is custom name resolution without needing a full DNS server setup. Any advice would be greatly appreciated! Another thing—I noticed the coredns pod won't even start after I added my entries. Help!
2 Answers
Another option is to utilize the hostAlias feature directly in your deployment definition. It might streamline the process for you. You can find more about it here: https://kubernetes.io/docs/tasks/network/customize-hosts-file-for-pods/.
You might want to check this guide out; it could provide the clarity you need: [Adding Custom Host to Kubernetes](https://hjrocha.medium.com/add-a-custom-host-to-kubernetes-a06472cedccb).
Also, `local-containers.override` doesn't seem to be standard in Kubernetes, so that could be part of the issue.
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