Roberto Carratalá

Linux Geek. Devops & Kubernetes enthusiast. SSA @ Red Hat.

All Posts

2021

Connecting stateful applications in multicluster environments with RHACM and Submariner

How can I deploy my applications in multiclustering environments and connect my microservices across the different clusters using the SDN and overlay network...

Deep Dive with RHACM and Submariner - Connecting multicluster overlay networks

How to connect your overlay networks of different Kubernetes clusters? How can you deploy stateful applications spanning in a multicluster cluster environmen...

Regenerating Kubeconfig for system:admin user in OpenShift clusters

You missed your kubeconfig file of your OpenShift cluster? Your dog ate your kubeconfig file? No worries! Let’s regenerate it in a easy and automated way!

Load Balancing and DNS with OpenShift IPI in VMware & On-Premise (Part II)

This is the second blog post of Load Balancing and DNS with OpenShift IPI series .

Load Balancing and DNS with OpenShift IPI in VMware & On-Premise (Part I)

How is managed the LoadBalancers and the DNS in OpenShift IPI in VMWARE and the rest of On-Premises platforms such as Baremetal, Openstack, or RHV? What are ...

2020

Multiple Route Shardings in the same node in a On-Premise OpenShift 4

How to run a Route Sharding in the same OpenShift nodes in a On-premise installation (UPI or IPI)? What are the steps for configuring it?

Deep Dive of OpenShift 4 Routers in On-Premise deployments

What’s the difference between the Routers / IngressController of OpenShift 4 in cloud environments and the deployments in On-premise? What are the main compo...

DNS Forwarding in OpenShift

How can I use a custom DNS in our cluster without modify the actual cluster DNS on top of for example AWS or Azure? How can I forward custom DNS and use spec...

Secure inter-cluster traffic in OpenShift with Service CA Operator

How I can secure the inter-cluster communication within two pods running into OpenShift? How can I secure one service calling another service using SSL both ...

Analysis of Operator Lifecycle Manager in OpenShift 4

How can I use the Operators in my OpenShift4 cluster? And how are updated and managed by the Operator Lifecycle Manager? What is the components of their arch...

Traffic Mirroring in OpenShift Service Mesh

How to do testing cases with live production in a safe, secure and predicted mode? How can achieve this within our Service Mesh? And what’s the traffic mirro...

Canary deployments in OpenShift Service Mesh

Whats a Canary deployment and how to configure in Service Mesh? What are the benefits of a Canary deployment? And how we can give more intelligence to our ro...

Blue Green deployments in OpenShift Service Mesh

Whats a Blue Green deployment and how to configure it our microservices within the Service Mesh? How change the balancing of our requests in a easy and quick...

Ingress Routing & Traffic Management in OpenShift Service Mesh

How configure ingress routing in Service Mesh and what components are involved? And which are the main differences between OpenShift Routes and Ingress routi...

Including microservices in OpenShift Service Mesh

How we can include within Service Mesh our microservices deployed easily and automatically? How to control and istiofying them? And what are the main compone...

Deploying AMQStreams Kafka without Cluster Admin

How to deploy fully automated a Kafka cluster using AMQStreams / Strimzi? And how to deploy Kafka clusters without being cluster-admin, using always regular ...

Upgrade OpenShift 4 clusters with the CLI

How to perform an OCP4 upgrade from the CLI safe, securely and fully CLI executed?

Making accesible from our laptop an OpenShift 4 UPI Libvirt/KVM Lab

How to expose certain ports of our VMs, to for example expose our Load Balancer port balancing itself the port of the API of OpenShift4? How to access to the...

DNS Deep Dive in OpenShift 4

How the DNS of OpenShift 4 works? And the operators to manage them? And how can I check the resolution basics within and externally to my OCP4 cluster?

Microservices Deployment in Service Mesh

How we can deploy microservices within Service Mesh easily and automatically? How to control and istiofying them? And what are the main components involved?

Service Mesh Installation

How to install Service Mesh easy, straight forward and with a basic but fully operational installation on top of OpenShift 4? And how are the advantages and ...

Analyse and debug network traffic in OpenShift

Sometimes is hard to analyse what is happening as networking level into your pods deployed in OpenShift or Kubernetes.

2019

Disabling the self provisioning in OpenShift 4

How to disable the Self Provisioning in OpenShift 4 clusters to gain more control for the projects created? How to apply a fancy new message when someone wit...

Extract AWS Credentials in a cluster of OpenShift 4

How obtain the AWS Credentials once the cluster of OCP4 is deployed? Where are they stored in the cluster?

Update SSH Keys into the nodes of OpenShift4 cluster

How to update the ssh keys into your OpenShift4 clusters once is deployed and up&running? And how to automate this easy and straightforward?

UPI Installation of OpenShift 4

How we can install OpenShift4 in UPI mode in AWS? How we can do in an semi-automatic way? Which are the caveats and the steps to execute?

Renew Certificates automatically in OpenShift 4

How generate certificates for our apps and sign them with a free and trusted Certificate Authority? And the most important, how I can automate this process f...

Collect Sosreport in OpenShift 4

This blog post aims to provide a guide for collect a Sosreport in a node of an OpenShift 4 Cluster.

Deep dive of Route Sharding in OpenShift 4

This blog post aims to provide a guide to implement Route Sharding in OpenShift Container Platform 4 (deployed in AWS), creating multiple routers for particu...

Machine Management in action into OpenShift 4

When you deploy a cluster of OpenShift 4.1 using the UPI (User-Provisioned Infrastructure) AWS installation, the deployment can be performed using the AWS Cl...

2018

Connect to Serial Console RHV VM through SSH

Imagine that you have one or several VMs deployed on top of your deployment of RHV, and you have not access with ssh configured (because is a brand new VM wi...

Share Vault between Ansible Core Roles

Sometimes you need to share the Ansible Vault between the different Ansible Roles, because you want to integrated within Tower or just in different Workflow ...

Integrate Ansible Tower with IDM