This article is for the Etcd introduction. I will show you what the Etcd is in a glance. What is the Etcd ? The name comes from etc directory of linux which stores usually all configurations of the linux. And suffix “D” of the etcd means the Distributed architecture. Actually, the etcd is a distributed…

I will walk you through how to trace network traffic and how to capture the traffic in AWS for OpenShift and Kubernetes here. The test request is sent by a client(JMeter) with “request-id” header, I will filter the tcp packets with the “request-id” header from tcpdump pcap files we captured…

In this article, I will show you how to configure the multiple networks in OpenShift using the Multus CNI based on ipvlan plug-in with other optional CNI plug-ins. Personally, I think the ipvlan CNI plug-in is the most useful and easy in most cases and environments due to less restrictions…

OpenShift v4.6 just has been released, it’s a first version supported Extended Update Support(EUS) on OpenShift. I walk you through bare metal installation under restricted network that I reviewed. I hope this article help your practical installation plan. OpenShift Container Platform 4.6 release notes Red Hat OpenShift Extended Update Support…

This test is a kind of hands-on review for the Replacing an unhealthy etcd member in the docs. It show you the progress of the lost one master recovery procedures on the bare-metal platform. The etcd design was changed as etcd operator as of OCP 4.5, …

It is a simple test evidence about OpenShift v4.6 automatic certification procedures, further information is here, Recovering from expired control plane certificates. I made The OpenShift cluster just installed stop before first rotating new certificates, and I start the cluster for test after 48 hours for make the certificates expire…

I’d like to show you simple demonstration of the pod rolling update through two patterns. First pattern is configured probes based on middle ware healthy check, and the other pattern is configured probes based on service healthy check. It’s so different each other, so it will be interesting for you. …

As of OpenShift v4.5, SCC(Security Context Constraints) is managed by RBAC, so I review how to work the SCC with RBAC(Role Based Access Control) on OpenShift. I will check the “users:” sections are not modified after adding “nonroot” SCC to “user1” login account and “test-sa” serviceaccount. And then check if…

As of OpenShift 4.6, we can enable AWS Network Load Balancer(NLB) for an Ingress Controller. Until now only NLB was configured for Control plane services, and the Ingress Controller was supported only for Classic Load Balancer on AWS by default. Refer Ingress Controller Network Load Balancer for AWS for more…