When writing test, the documentation that the API you are integrating will only list all the good values that they intend to deliver to you or the other way around. What I observed from working with my colleague Harmen is this: A negative test A positive test for the happy path An empty input A malformed data I might add more example in the future but for now, I’ll try to follow this guideline....
Prerequisite: A cluster with RBAC enabled. Have enough capacity in the cluster Install Helm: kubectl create serviceaccount tiller --namespace kube-system kubectl create clusterrolebinding tiller-rb --clusterrole=cluster-admin --serviceaccount=kube-system:tiller helm init --service-account tiller Get the values.yaml from here Edit some things that you want to tweak, for us, we change the CPU limit to a lower value. Then just install Prometheus: helm install -f values.yaml --name prometheus stable/prometheus Ideally, this should be installed in another namespace but we will keep it simple for now....
Increasing disk space without downtime. So in our team, we had to resize an instance disk because it’s getting full, this is our experience. For the first time we search on how to do this, there are many articles written about it and most of them require to stop the system and detaching a volume. But there must be a real doc from aws itself, that is most likely up to date....
One of our server provider which is running in Germany have a bot that scans for an open port, this is to prevent other humans/robot in abusing services that are open on the internet. For us, they determined that our memcached port is open, we were confused at first how could this happen, we were sure that this is blocked via iptables. It turns out memcached by default listens to both TCP and UDP, since we don’t have yet a firewall for UDP, we opted for something simpler and to disable UDP on memcached(we know we only use TCP)....
At work, we started using Kubernetes for stateless application. We frequently change the values of configmap/secrets especially in staging environments, however, this is still not baked in to k8s. How to do it? You have to replace a config to update it. For example, if you create a configmap like this: kubectl create configmap site-config --from-file=nginx.conf If you want to update that, you have to add the command above with...