[Infrastructure as Code (IaC) Pulumi] Use Pulumi kubernetes (K8S) Helm Chart to deploy Fluent Bit

Posted on 2021-11-27 Edited on 2023-09-02 In Infrastructure as Code (IaC) , Cloud Native , Kubernetes (K8S) , Pulumi Views: Word count in article: 4.5k Reading time ≈ 4 mins.

Fluent Bit

Fluent Bit is an open source Log Processor and Forwarder which allows you to collect any data like metrics and logs from different sources, enrich them with filters and send them to multiple destinations. It’s the preferred choice for containerized environments like Kubernetes.

Fluent Bit is designed with performance in mind: high throughput with low CPU and Memory usage. It’s written in C language and has a pluggable architecture supporting more than 70 extensions for inputs, filters and outputs.

This article is about how to use Pulumi, kubernetes (K8S) provider, Helm Chart and TypeScript SDK to deploy Fluent Bit within Kubernetes (K8S).

Prerequisites

Kubernetes (K8S)

Kubernetes (K8s) is an open-source system for automating deployment, scaling, and management of containerized applications.

See Getting started | Kubernetes - https://kubernetes.io/docs/setup/ to leanr more.
Pulumi - Modern Infrastructure as Code - https://www.pulumi.com/

Pulumi is a modern infrastructure-as-code platform that allows you to use common programming languages, tools, and frameworks, to provision, update, and manage cloud infrastructure resources.

Install the Pulumi - https://www.pulumi.com/ CLI.
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# Mac OS X
$ brew install pulumi
See Download and Install | Pulumi - https://www.pulumi.com/docs/get-started/install/ to learn more about others OS.
Node.js - https://nodejs.org/en/

Node.js® is a JavaScript runtime built on Chrome’s V8 JavaScript engine.

Install Node.js - https://nodejs.org/en/ CLI.
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# Mac OS X
$ brew install node
See Node.js - https://nodejs.org/en/ to learn more about others OS.

Usage

Pulumi New

Create the workspace directory.

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$ mkdir -p col-example-pulumi-typescript-fluent-bit

$ cd col-example-pulumi-typescript-fluent-bit

Pulumi login into local file system.

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$ pulumi login file://.
Logged in to cloudolife as cloudolife (file://.)
or visit https://pulumi.com/docs/reference/install/ for manual instructions and release notes.

Pulumi new a project with kubernetes-typescript SDK.

1	$ pulumi new kubernetes-typescript

The above command will create some files within the current directory.

tree . -L 1
.
├── node_modules/
├── package.json
├── package.json.lock
├── Pulumi.dev.yaml
├── Pulumi.yaml
└── main.ts

Install js-yaml package to load and parse yaml file.

1	$ npm i js-yaml

Pulumi Configuration

Configure Kubernetes

By default, Pulumi will look for a kubeconfig file in the following locations, just like kubectl:

The environment variable: $KUBECONFIG,
Or in current user’s default kubeconfig directory: ~/.kube/config

If the kubeconfig file is not in either of these locations, Pulumi will not find it, and it will fail to authenticate against the cluster. Set one of these locations to a valid kubeconfig file, if you have not done so already.

Configure Values.yaml

Edit values.yaml and replace content within {{ }}.

# values.yaml

# helm-charts/values.yaml at main · fluent/helm-charts
# https://github.com/fluent/helm-charts/blob/main/charts/fluent-bit/values.yaml

main.ts

// main.ts

import * as pulumi from "@pulumi/pulumi";

import * as k8s from "@pulumi/kubernetes";

const yaml = require('js-yaml');
const fs   = require('fs');

const nameElastic = "elastic"

// kubernetes.core/v1.Namespace | Pulumi
// https://www.pulumi.com/docs/reference/pkg/kubernetes/core/v1/namespace/
const namespaceElastic = new k8s.core.v1.Namespace(nameElastic, {
    metadata: {
        name: nameElastic,
    },
})

const values = yaml.safeLoad(fs.readFileSync("./values.yaml", 'utf8'))

const charNameFluentBit = "fluent-bit"

const charFluentBit = new k8s.helm.v3.Chart(charNameFluentBit, {
    chart: charNameFluentBit,
    version: "0.19.7",
    fetchOpts:{
        repo: "https://fluent.github.io/helm-charts",
    },
    values: values,
    namespace: namespaceElastic.metadata.name,
})

Pulumi Up

Run pulumi up to create the namespace and pods.

1	$ pulumi up

See pods about fluent-bit.

$ kubectl -n elastic get pods | grep fluent-bit
fluent-bit-5twrq                         1/1     Running   0          4h15m
fluent-bit-b29zc                         1/1     Running   0          4h15m
fluent-bit-gnmqw                         1/1     Running   0          4h15m