# Issues with DNS resolution of cert-manager webhook

**URL:** <https://discuss.kubernetes.io/t/issues-with-dns-resolution-of-cert-manager-webhook/27737>\
**Category:** General Discussions\
**Tags:** network\
**Created:** [April 3, 2024, 5:13pm UTC](https://discuss.kubernetes.io/t/issues-with-dns-resolution-of-cert-manager-webhook/27737 "2024-04-03T17:13:47Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![tim.desmet](https://sea2.discourse-cdn.com/flex016/user_avatar/discuss.kubernetes.io/tim.desmet/32/14676_2.png) [@tim.desmet](https://discuss.kubernetes.io/u/tim.desmet)\
**Post date:** [April 3, 2024, 5:13pm UTC](https://discuss.kubernetes.io/t/issues-with-dns-resolution-of-cert-manager-webhook/27737/1 "2024-04-03T17:13:47Z")

</div>

I have a Kubernetes setup on VMs on our OpenStack environment.  
Pods and everything working fine, have a HA load balancer setup and ingress requests are handled correctly. Now I wanted to setup cert-manager to auto generate Let’s Encrypt SSL certificates for the nginx Ingress services.

For some reason the webhook isn’t working, I’ve checked and it tries to call the **[https://cert-manager-webhook.cert-manager.svc:443](https://cert-manager-webhook.cert-manager.svc:443)** webhook. Did a test to DNS resolve it in a test pod but **cert-manager-webhook.cert-manager.svc** doesn’t resolve. When I add .cluster.local at the end it does resolve **cert-manager-webhook.cert-manager.svc.cluster.local**

Any thoughts? Appreciate any help! I’m new to Kubernetes.

### Cluster information:

Kubernetes version: v1.29.3  
Cloud being used: bare-metal (OpenStack)  
Installation method: kubeadm  
Host OS: AlmaLinux 8.9  
CNI and version: calico v3.26.1  
CRI and version: docker://26.0.0  
CoreDNS version: v1.11.1  
Cert-Manager version: v1.14.4