In this article, I will demonstrate how to build a Hubot bot on OpenShift. Four key take-away points. Create secret for git clone Use docker strategy to build if you prefer Dockerfile over S2I Inject environment variables from ConfigMap If needed, you can replace the FROM or CMD that defined in Dockerfile during deployment. In … Continue reading Run Hubot on OpenShift
At the time of writing, OpenShift dedicated (v3.5.5.31) only supports autoscaling based on the CPU metrics. So the first step is to ensure the CPU request is in place. It can be setup in the section of container spec. e.g spec: containers: image: 'poc/web' name: my-web ports: - containerPort: 3000 resources: requests: cpu: 200m limits: … Continue reading Autoscaler on OpenShift Dedicated
We have been running mysql 5.7 on OpenShift with RedHat provisioned images. To make it work is easy, but to make it work correctly is a bit harder. One example is that how to setup the innodb_buffer_pool_size (one of the most important parameters of mysql)? When you build the image you don't know how much memory the … Continue reading Build smart into your docker images
I extracted a few points to grasp the rough idea of how Kubernetes manages resources QoS: Pods that need to stay up reliably can request guaranteed resources, while pods with less stringent requirements can use resources with weaker or no guarantee. If a pod is successfully scheduled, the container is guaranteed the amount of resources … Continue reading Resources QoS in Kubernetes
If you see the following error when run Rancher server 2.0 preview, it could be caused by your proxy. This is NOT the proxy settings in the docker daemon but the one inside the container itself. I noticed that Rancher server 2.0 tries to download some machine drivers when boots up, it returns the 403 … Continue reading HTTP Error 403 of Rancher server 2.0 preview
I have been working on OpenShift Dedicated (on AWS) for a few weeks. At the time of writing (v3.5.5.31), here are a couple missing parts that I have found out so far. They are all confirmed by the RedHat support. Share persistent volume across multiple containers: Currently there is no way to share the persistent … Continue reading Missing Parts of OpenShift Dedicated
Above is the Kubernetes design architecture. In my POC environment, I have written a script to install and configure the kubernetes. I have tested it on the RHEL 7, I think it should work on CentOS 7 as well but have not tested yet. Please be aware that the script uses the latest codes from … Continue reading Install Kubernetes
