Stories Tag: openshift-4

How to restore lost one master and etcd on OCP4.6 | by Daein Park | Nov, 2020 | Medium

admin 3 weeks ago in

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, so this restore procedures are different with old versions. After removing one master node vm on a hypervisor host,…

How to appropriately configure readiness/liveness probes for suppressing lost requests ? | by Daein Park | Nov, 2020 | Medium

admin 4 weeks ago in

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. You can learn why we configure the probes based on the service health check through…

How to recovery the expired certificates on OpenShift v4.6 | by Daein Park | Nov, 2020 | Medium

admin 4 weeks ago in

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. The certificates provided during installation steps will be expired within 24 hours by default as…

Review SCC(Security Context Constraints) based on RBAC in OpenShift v4 | by Daein Park | Oct, 2020 | Medium

admin 1 month ago in

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 the related RoleBindings or ClusterRoleBinding created for “nonroot” SCC after that. We can see the…

Startup, Liveness and Readiness Probes on OpenShift | by Daein Park | Oct, 2020 | Medium

admin 2 months ago in

As of OpenShift 4.5(Kubernetes 1.18), startup probe is graduated to beta. So we can configure it by default. Let’s look this new feature and existing ones in a nutshell. Probe is health check of the running pods for certain purposes, it means if the check is failed, then specific action is conducted to the pods. Such as restarting the pods and blocking external accesses to…

OpenShift 4 with MacVLAN and whereabouts | by Oren Oichman | Oct, 2020 | Medium

admin 2 months ago in

One of the must important things when transitioning into Micro Services is to make sure we provide a solution for edge scenarios such as Multicast communication or random clients request from a specific scope.For those type of scenarios (and more) in Openshift 4 we can setup a CNI named “Multus” which enables us to add another interface to our running pod and those connecting it…

OpenShift 4.6 Announcement Highlights | by Justin Miller | Oct, 2020 | Medium

admin 2 months ago in

With the announcement of many of the upcoming OpenShift 4.6 in a live stream today Red Hat has of new features and functionality to the platform. Below are slides and notes from the presentation (mostly made for myself) that I am publishing for anyone interested. The three biggest areas of expansion include: Kubernetes 1.19 Features Spotlight: Remote Worker Nodes: With OpenShift 4.6 the new Remote…

Debug Spring Boot Apps on Red Hat OpenShift4 (Bahasa) | by Erfin Feluzy | Development using RedHat Product. (This is...

admin 2 months ago in

Kisah ini berawal dari sebuah pertanyaan dari salah satu pengguna OpenShift tentang bagaimana cara debug aplikasi Spring Boot yang berjalan sebagai container di OpenShift. Mengingat cukup banyak teman-teman coder yang menggunakan framework ini sebagai aplikasi microservice, maka saya coba buat tutorialnya untuk remote debug aplikasi java pada OpenShift4. Flow nya seperti gambar berikut. Tambahkan environment variable JAVA_DEBUG=true pada Deployment atau Deployment Config Atau, menggunakan oc…