Set App (ie: Kubernetes Pod) Hostname

[HarryMuscle]

Is it possible to set the hostname for a Kubernetes pod in TrueNAS Scale? I didn't see it in the GUI so I'm hoping it's possible to set it via the API.

I need to get the pod IP address (not the service IP address, that's possible without a hostname) from a second pod using a domain name and as far as I can tell that's only possible if you set the hostname on the first pod.

Thanks,
Harry

 

[waqarahmed]

@HarryMuscle can i ask what you want to do basically ? It seems you want to communicate between 2 different apps but in that case you should be using services instead of finding out pod ip addresses as they are bound to change

 

[HarryMuscle]

@HarryMuscle can i ask what you want to do basically ? It seems you want to communicate between 2 different apps but in that case you should be using services instead of finding out pod ip addresses as they are bound to change

I ended up finding a different solution, but basically what I was trying to do is find the source IP for pod A from pod B so that I can whitelist that IP in pod B. The best approach seemed to be to do this via the DNS, however, it only provides the service IP address (unless you set a static hostname on the pod) but the source IP for communications is the pod IP address not the service IP address.

Thanks,
Harry

 

[truecharts]

you should whitelist:
172.16.0.0/16

If you want to block other apps from communicating, Kubernetes uses networkPolicies instead.