Logging on Build. Run. Repeat.

HashiCorp Consul Service Mesh on Kubernetes Series - Part 1 - Introduction and Setup

Wed, 01 Jan 2025 09:00:00 -0400

Modern cloud-native architectures rely heavily on microservices, and Kubernetes has become the go-to platform for deploying, managing, and scaling these distributed applications. As the number of microservices grows, ensuring secure, reliable, and observable service-to-service communication becomes increasingly complex. This is where service mesh solutions, such as HashiCorp Consul, step in to provide a seamless approach to managing these challenges. In this blog post, we will delve into the integration of HashiCorp Consul Service Mesh with Kubernetes, exploring its architecture, features, and step-by-step deployment guide.

HashiCorp Consul Service Mesh on Kubernetes Series - Part 2 - Observability

Wed, 01 Jan 2025 09:00:00 -0400

Modern service meshes require robust observability to ensure seamless operations, proactive troubleshooting, and performance optimization. In this section, we explore the observability features of HashiCorp Consul Service Mesh, including visualizing the service mesh, querying metrics, distributed tracing, and logging and auditing.

Visualizing the Service Mesh

The Consul UI is used for visualizing the service mesh and its topology.

Use the watch command to send requests to the application continually. Make sure HTTP status code 200 is returned in the output.

HashiCorp Consul Service Mesh on Kubernetes Series - Part 3 - Traffic Management

Wed, 01 Jan 2025 09:00:00 -0400

Efficient traffic management is essential for maintaining application reliability, optimizing performance, and implementing advanced deployment strategies in a service mesh. HashiCorp Consul provides powerful traffic management capabilities through service routers, splitters, and resolvers. In this section, we explore request routing, traffic shifting, request timeouts, and circuit breaking.

Request Routing

This section shows you how to route requests dynamically to multiple versions of a microservice.

The Bookinfo sample consists of four separate microservices, each with multiple versions. Three different versions of one of the microservices, reviews, have been deployed and are running concurrently. To illustrate the problem this causes, access the Bookinfo app’s /productpage in a browser and refresh several times.

HashiCorp Vault Enterprise - Performance Replication on Kubernetes

Wed, 01 Jan 2025 09:00:00 -0400

This blog post dives into the technical implementation of Vault Enterprise replication within a Kubernetes environment. We’ll explore how to set up performance and disaster recovery replication, overcome common challenges, and ensure smooth synchronization between clusters. Whether you’re aiming for redundancy or better data locality, this guide will equip you with the insights and tools needed to leverage Vault’s enterprise-grade features in Kubernetes effectively.

Architecture

Prerequisites

2 Kubernetes clusters. *Note: for simulation purposes, you can also use a single Kubernetes cluster with multiple namespaces to host both Vault clusters.
Helm installed
kubectl installed
Vault CLI installed
jq installed
Vault Enterprise license

Note: for this implementation LoadBalancer services are used on Kubernetes to expose the Vault services (the API/UI and the cluster address for replication). It is highly recommended to use a LoadBalancer rather than ingress to expose the cluster address for replication. Vault itself performs the TLS termination as the TLS certificates are mounted to the Vault pods from Kubernetes. Additionally, note that when enabling the replication, the primary cluster points to the secondary cluster address (port 8201) and not the API/UI address (port 8200). When the secondary cluster applies the replication token, however, it points to the API/UI address (port 8200) to unwrap it and compelete the setup of the replication. We will see this in more detail in the implementation section.

MinIO on vSphere - Automated Deployment and Onboarding

Fri, 01 Nov 2024 09:00:00 -0400

In the world of Kubernetes, reliable S3-compliant object storage is essential for tasks like storing backups. However, not everyone has access to a native S3-compatible solution, and setting one up can feel like a daunting task. MinIO, an open-source object storage solution, is a popular choice to fill this gap. Its lightweight, high-performance architecture makes it an excellent option for Kubernetes users seeking quick and reliable storage.

MinIO is also one of the most widely adopted open-source object storage solutions, thanks to its simplicity and S3 compatibility. It’s perfect for Kubernetes environments that need a reliable and scalable storage layer for backups, logs, or other data.

HashiCorp Vault Intermediate CA Setup with Cert-Manager and Microsoft Root CA

Mon, 01 Jan 2024 09:00:00 -0400

In this post, we’ll explore how to set up HashiCorp Vault as an Intermediate Certificate Authority (CA) on a Kubernetes cluster, using a Microsoft CA as the Root CA. We’ll then integrate this setup with cert-manager, a powerful Kubernetes add-on for automating the management and issuance of TLS certificates.

The following is an architecture diagram for the use case I’ve built.

A Microsoft Windows server is used as the Root CA of the environment.
A Kubernetes cluster hosting shared/common services, including HashiCorp Vault. This is a cluster that can serve many other purposes/solutions, consumed by other clusters. The Vault server is deployed on this cluster and serves as an intermediate CA server, under the Microsoft Root CA server.
A second Kubernetes cluster hosting the application(s). Cert-Manager is deployed on this cluster, integrated with Vault, and handles the management and issuance of TLS certificates against Vault using the ClusterIssuer resource. A web application, exposed via ingress, is running on this cluster. The ingress resource consumes its TLS certificate from Vault.

Prerequisites

Atleast one running Kubernetes cluster. To follow along, you will need two Kubernetes clusters, one serving as the shared services cluster and the other as the workload/application cluster.
Access to a Microsoft Root Certificate Authority (CA).
The Helm CLI installed.
Clone my GitHub repository. This repository contains all involved manifests, files and configurations needed.

Setting Up HashiCorp Vault as Intermediate CA

Deploy Initialize and Configure Vault

Install the Vault CLI. In the following example, Linux Ubuntu is used. If you are using a different operating system, refer to these instructions.

CAPV: Addressing Node Provisioning Issues Due to an Invalid State of ETCD

Fri, 01 Dec 2023 09:00:00 -0400

I recently ran into a strange scenario on a Kubernetes cluster after a sudden and unexpected crash it had experienced due to an issue in the underlying vSphere environment. In this case, the cluster was a TKG cluster (in fact, it happened to be the TKG management cluster), however, the same situation could have occurred on any cluster managed by Cluster API Provider vSphere (CAPV).

I have seen clusters unexpectedly crash many times before and most of the time, they successfully went back online when all nodes were up and running. In this case, however, some of the nodes could not boot properly, and Cluster API started attempting their reconciliation.

CAPV: Fixing and Cleaning Up Idle vCenter Server Sessions

Wed, 01 Nov 2023 09:00:00 -0400

I recently ran into an issue causing the vCenter server to crash almost daily. What seemed to be a random vCenter issue initially, turned out to be related to CAPV (Cluster API Provider vSphere), running on some of our Kubernetes clusters. That was also an edge case I had not seen before, so I decided to document and share it here.

Initially, the issue we were witnessing on the vCenter server was the following:

Tanzu Kubernetes Grid GPU Integration

Wed, 01 Mar 2023 09:00:00 -0400

I recently had to demonstrate Tanzu Kubernetes Grid and its GPU integration capabilities. Developing a good use case and assembling the demo required some preliminary research.

During my research, I reached out to Jay Vyas, staff engineer at VMware, SIG Windows lead for Kubernetes, a Kubernetes legend, and an awesome guy in general. :) For those who don’t know Jay, he is also one of the authors of the fantastic book Core Kubernetes (look it up!).

Harbor Registry – Automating LDAP/S Configuration – Part 2

Sun, 01 Jan 2023 09:00:00 -0400

This post continues our two-part series on automating LDAP configuration for Harbor Registry. In the previous post, we demonstrated how to achieve this using Ansible, running externally. However, external automation has its challenges, such as firewall restrictions or limited API access in some cases/environments.

Note: make sure you review the previous post as it provides a lot of additional background and clarifications on this process, LDAPS configuration, and more.

Here, we explore an alternative approach using Terraform, running the automation directly inside the Kubernetes cluster hosting Harbor. This method leverages native Kubernetes scheduling capabilities for running the configuration job in a fully declarative approach and does not require any network access to Harbor from the machine running the job.

Customizing Elasticsearch indices using Fluent-Bit in TKG