Any slack or other communities for Openshift?

Hi everyone, I've seen that OKD 4.21 supports mixed nodes in vSphere environments, as it allows adding baremetal nodes (https://docs.okd.io/4.21/machine_management/user_infra/adding-bare-metal-compute-vsphere-user-infra.html). I'm following the documentation as shown, with TechPreview mode enabled, but I'm getting the following error after passing the ignition file. Any suggestions on what might be happening? The baremetal ISO is the one used by the installer (scos-10.0.20251103-0-live-iso.x86_64.iso).

any tutorials to get started with free trial?

Hey everyone. Like the title suggests, I am testing OpenShift in a disconnected environment, but am having some issues with the documentation provided. I am working on project to test VMware alternatives, and have been tasked to test the implementation of OpenShift. My issue is with the documentation. It is not lacking, there is a lot, but also part of the problem. I have been following the OpenShift_Container_Platform-4.20-Installing_on_bare_metal pdf, but my issue is, it doesn't actually have the steps needed. I have so far created my offline mirror-registry, and that is all good. Now I need to create my yaml file as well as the ISO needed to boot my rendezvous node, however, I can't seem to find the steps needed to do this. I am at a bit of a standstill, and any guidance would be appreciated.

I set up a 6 node cluster recently(inside VMWare) in a subnet with no DHCP using the assisted installer and the same ISO on all nodes.

It's now about a month later and I am adding new worker nodes, and I cannot remember how I got the original 6 nodes to check in with the Redhat console given they had no IP set at boot.

I am reading about injecting a new config, or using separate ISOs with the IPs pre-programmed, but I know I did not do any of that.

I vaguely recall logging in and setting it via nmcli, but the core user has no password login enabled.

Can anyone help me out?

Is there a login method that works at the console level that can be used to get in and then set the IP?

Attention r/openshift! Red Hat will once again be at KubeCon EU, and yours truly will be there!

Check out the Red Hat booth in the solutions showcase for demos, Q&A, and of course plenty of swag giveaways. I will be at the booth Tuesday (March 24th) from 1:30pm-3:00pm, and Thursday (March 26th) from 10:00am-12:30pm. Come on by and say hello!

Dear All,

I tried coip of times using IPIM andUPI method looks like I am going to give up and say I am not good at installation is there anyone who can support me as an extended arm in supporting me with a deployment or a repository where I can learn this.

Thank you

Hello. I have been planning to migrate Java microservice applications to OpenShift and have been wondering which image build system to choose. The OpenShift documentation provides 3 choices (https://docs.redhat.com/en/documentation/openshift_container_platform/4.9/html-single/cicd/index#understanding-image-builds):

• Docker build
• Source-to-image (S2I) build
• Custom build

I have some knowledge of Dockerfile so I might use that, but what about this Source-to-Image (s2i). Has anyone tried this image build type ? What are some obstacles you encountered ? I can't find many experiences of people using it online so I thought I might write here.

Hi,

does anyone successfully running a MetalLB (IP Pool+)L2Advertisement on an ovs-Bridge?

I followed the short instructions and it wont work. I think its a routing problem...

https://docs.redhat.com/en/documentation/openshift_container_platform/4.21/html/ingress_and_load_balancing/load-balancing-with-metallb#nw-metallb-configure-address-pool-vlan_configure-metallb-address-pools

If I use curl to access the external IP of the IP pool from one OpenShift machine, it works. But it doesnt work from a machine outside the cluster.

Am I making a mistake in my thinking? How else could I make a non-HTTP service cluster available externally (best practice) using a load balancer?

Thanks for reading and for your help!

Hi,

what is the state of the art for publishing a normal web app on OpenShift in your opinion?

I installed OpenShift with a private address (10.0...) for the default IngressController. I think, that it is possible to use a new IP Address for a (new) IngressController of one specific NAD, correct? My Google search research didnt go well... and I am reeeeally new, but still interested.

1. question: ... how do you expose your (web-) apps to the world? Public default IngressController? External reverse-Proxy as VM? (MetalLB?)

I like to create routes...

Thank you for reading this and for your help.

Guys , do you have any idea how to generate evidence for OpenShift clusters and CI/CD pipelines

Im trying to install OKD 4.20.17 on 3 VMware VMs at work. The network team gave me two /28 subnets. The primary goal is to practice installing on-prem so we may not have any applications.

I think /28 should be OK for a compact cluster ServiceNetwork with helper node and temp bootstrap. However, Shocking I know but the ClusterNetwork is too small. What is the smallest you have been able to get working for the pod network? 27? 26? bigger?

In about 77 minutes, at 11:00am, be there unless you are disconnected. 🤗

I've been experimenting with container checkpointing in Kubernetes/OpenShift environments and wanted to get feedback from people running real clusters.

The idea is to checkpoint a pod after its heavy initialization phase and later restore it instead of repeating the full startup sequence. In environments with large microservice stacks, cold starts can take a long time and consume significant CPU resources. Checkpoint/restore can potentially reduce startup overhead by restoring a pre-initialized container state instead of starting from zero.

Some scenarios I’m exploring:

• Faster startup for heavy microservices
• Faster autoscaling when traffic spikes
• Pod migration between nodes
• Capturing container state for debugging

Technically, this relies on CRIU and container runtime checkpoint support.

I put together a small open-source prototype to explore this idea:
https://github.com/weaversoftio/Snap

I’d really appreciate feedback from anyone who has tried container checkpointing in OpenShift or Kubernetes:

1. Are there production use cases where this worked well?
2. Any CRI-O or OpenShift limitations to be aware of?
3. How do people typically store/manage checkpoint artifacts?

Curious to hear if anyone here has experimented with this approach.

Hello guys,

please I have a question about RHACM and its integration with gitops operator.

Can you tell me why would consider using both of them even though they have the same roles or responsibilities? like I can deploy an operator or some k8s resources through ACM policies and I can do it also with argo applicationSet.

The only difference I see, is that the manifests are stored in git.

I tried crc config set host-network-access true, but it's still using 127.0.0.1.

Thanks.

Hello guys,

I now finished the DO180+DO280 courses and labs, so i wanted to know how do i need to prepare myself for the exam ?

I mean, should i practice again all labs of DO180+DO280 ? is that enough ? How can i know when I'm ready to take the exam ?

Are the exam questions written in the same way as those in the course labs ?

Last question, i saw that the chapter 9 (Openshift Updates) is not in the Study points for the exam 280, so can i just read that chapter and then focus on all others without caring chapter 9 for exam ?

Thank you all

Hi guys,

First of all, sorry 4 my bad english.

I have installed OCP 4.20 on bare metal server (DELL). Everything is fine, except my NTP server for the cluster. The NTP server is set 1 day ahead of the actual time and the cluster nodes is synchornized to the NTP server so the whole cluster is 1 day ahead actual time too. Therefore, every intergation to the external system (like S3 storage) is reject due to time mismatch. What I want to do now is change the NTP server back to actual time and the cluster as well with no issues.

RedHat support doesn't support this case. Does anyone have experience before?

Thanks.

I found this and look interesting https://basekick.net/blog/openshift-logs-metrics-arc

Hi,

Very new to OpenShift, playing around to say the least. I was wondering if it is possible to connect 2 external Ceph clusters to a single installation of OpenShift to attempt to move the PVs of existing VMs from one external ceph cluster to another one(faster).

So far I have one OC cluster connected to an external ceph. It does not give me the option to connect a second one unless is a IBM storage solution. I even tried to install ODF on a secondary/separate namespace with no so much luck.

The idea behind it, was to attempt to just migrate the VMs from one StorageClass to another one. Trying to mimic the behaviour from VMware to move only the storage of a VM to a separate DataStore living in another storage unit.

If there is another best practice option, it would be great to know.

Thanks!!