• Configure an AWS Load Balancer to target an Autoscaling Group using terraform

    3 min read

    Terraform AWS load balancer target auto scaling group

    It's quite convenient to be able to configure a AWS Load Balancer to target an Auto Scaling Group so we don't have to handle how instances are getting in and out of this load balancer. This can be done easily using terraform as follows

    04/05/2022

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  • ALB Ingress: redirect traffic to HTTPS

    2 min read

    One of the beauties of using an ALB Ingress controller on AWS is that you can configure SSL certificates for your Ingress by just defining you want to use HTTPS

    apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  annotations:
    kubernetes.io/ingress.class: alb
    alb.ingress.kubernetes.io/listen-ports: '[{"HTTP":80},{"HTTPS":443}]'

    But this is going to serve the same content using HTTP and HTTPS. Configuring a SSL redirect it is also pretty straightforward but involves two steps:

    22/03/2021

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  • Error syncing load balancer: failed to ensure load balancer: could not find any suitable subnets for creating the ELB

    2 min read

    If we try to create a LoadBalancer on an AWS EKS cluster without any public subnet it will get stuck on the pending state and we won't get any external IP/DNS name for it. By using kubectl describe we will be able to get the actual error:

    $ kubectl get svc -n pet2cattle
NAME      TYPE           CLUSTER-IP       EXTERNAL-IP   PORT(S)        AGE
demo-lb   LoadBalancer   172.20.235.213   <pending>     80:30525/TCP   7d
$ kubectl describe svc demo-lb -n pet2cattle 
Name:                     demo-lb
Namespace:                pet2cattle
Labels:                   <none>
Annotations:              <none>
Selector:                 run=demo-lb
Type:                     LoadBalancer
IP Families:              <none>
IP:                       172.20.166.181
IPs:                      <none>
Port:                     <unset>  80/TCP
TargetPort:               80/TCP
NodePort:                 <unset>  30088/TCP
Endpoints:                10.236.124.69:80,10.236.126.253:80
Session Affinity:         None
External Traffic Policy:  Cluster
Events:
  Type     Reason                  Age                From                Message
  ----     ------                  ----               ----                -------
  Normal   EnsuringLoadBalancer    12s (x3 over 27s)  service-controller  Ensuring load balancer
  Warning  SyncLoadBalancerFailed  12s (x3 over 27s)  service-controller  Error syncing load balancer: failed to ensure load balancer: could not find any suitable subnets for creating the ELB

    17/02/2021

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From pet to cattle
Treat your kubernetes clusters like cattle, not pets