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Check ca_cert

Check command ca_cert checks the expiration timestamp of Kubernetes api server CA certificate. No longer you have to get a surprise that the CA certificate for your cluster has expired.

Spec

ca_cert check command has the following variables:

  • warning - Condition for warning, compare with tiem left before expiration. (Default: TTL < 360h)
  • critical - Condition for critical, compare with tiem left before expiration. (Default: TTL < 120h)

Execution of this command can result in following states:

  • OK
  • WARNING
  • CRITICAL
  • UNKNOWN

Tutorial

Before You Begin

At first, you need to have a Kubernetes cluster, and the kubectl command-line tool must be configured to communicate with your cluster. If you do not already have a cluster, you can create one by using Minikube.

Now, install Searchlight operator in your cluster following the steps here.

To keep things isolated, this tutorial uses a separate namespace called demo throughout this tutorial. Run the following command to prepare your cluster for this tutorial:

$ kubectl create namespace demo
namespace "demo" created

$ kubectl get namespaces
NAME          STATUS    AGE
default       Active    6h
kube-public   Active    6h
kube-system   Active    6h
demo          Active    4m

Create Alert

In this tutorial, we are going to create an alert to check ca_cert.

$ cat ./docs/examples/cluster-alerts/ca_cert/demo-0.yaml

apiVersion: monitoring.appscode.com/v1alpha1
kind: ClusterAlert
metadata:
  name: ca-cert-demo-0
  namespace: demo
spec:
  check: ca_cert
  vars:
    warning: 240h
    critical: 72h
  checkInterval: 30s
  alertInterval: 2m
  notifierSecretName: notifier-config
  receivers:
  - notifier: Mailgun
    state: CRITICAL
    to: ["ops@example.com"]
$ kubectl apply -f ./docs/examples/cluster-alerts/ca_cert/demo-0.yaml 
clusteralert "ca-cert-demo-0" created

$ kubectl describe clusteralert ca-cert-demo-0 -n demo
Name:		ca-cert-demo-0
Namespace:	demo
Labels:		<none>
Events:
  FirstSeen	LastSeen	Count	From			SubObjectPath	Type		Reason		Message
  ---------	--------	-----	----			-------------	--------	------		-------
  9s		9s		1	Searchlight operator			Normal		SuccessfulSync	Applied ClusterAlert: "ca-cert-demo-0"

Voila! ca_cert command has been synced to Icinga2. Please visit here to learn how to configure notifier secret. Now, open IcingaWeb2 in your browser. You should see a Icinga host demo@cluster and Icinga service ca-cert-demo-0.

check ca_cert

Cleaning up

To cleanup the Kubernetes resources created by this tutorial, run:

$ kubectl delete ns demo

If you would like to uninstall Searchlight operator, please follow the steps here.

Next Steps

  • To periodically run various checks on nodes in a Kubernetes cluster, use NodeAlerts.
  • To periodically run various checks on pods in a Kubernetes cluster, use PodAlerts.
  • See the list of supported notifiers here.
  • Wondering what features are coming next? Please visit here.
  • Want to hack on Searchlight? Check our contribution guidelines.

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