If you are using cert-manager versions older than 0.8.0, they will start to block all traffic from these versions and result in your SSL certificates not working. Cert-manager 0.9.0 is already released and should be updated immediately.
- Kubernetes Cluster
If you have deployed cert-manager with Helm
Most people are familiar with Helm and the deployment of cert-manager through helm charts. And you can easily check if you are affected by typing “Helm list | grep cert-manager” and see what version you are running.
- Upgrade cert-manager to version 0.9.0 or newer and don’t forget to back-up in case something breaks during the upgrade.
Release notes: https://github.com/jetstack/cert-manager/releases
Helm chart: https://hub.helm.sh/charts/jetstack/cert-manager
You can read more about it here: