Using kubernetes fluentbit.fluent.io with databases.spotahome.com

Question

Pulumi · Accepted Answer

To use Fluent Bit (`fluentbit.fluent.io`) on Kubernetes with a PostgreSQL database hosted by `databases.spotahome.com`, you would follow these general steps:

1. **Set up Fluent Bit on Kubernetes**: Deploy Fluent Bit as a log processor and forwarder. It's an open source and multi-platform log processor and forwarder which allows you to collect data/logs from different sources, unify and send them to multiple destinations. It's fully compatible with Docker and Kubernetes environments.

2. **Output to PostgreSQL**: Configure Fluent Bit to send logs to a PostgreSQL instance. Fluent Bit can be configured to send collected logs to a specified output, in your case databases.spotahome.com, as long as the correct output plugin is available and you have network connectivity between your Kubernetes cluster and the PostgreSQL instance.

Below is a Pulumi program in TypeScript which demonstrates how you might set up Fluent Bit on a Kubernetes cluster and configure it to output logs to a PostgreSQL server. Note that the specifics of the setup depend on the actual PostgreSQL service you're using (`databases.spotahome.com` in your case), your Kubernetes cluster configuration details, and the Fluent Bit configuration options.

```typescript
import * as k8s from '@pulumi/kubernetes';

// Create a Kubernetes Namespace
const namespace = new k8s.core.v1.Namespace('fluentbit-namespace', {
    metadata: { name: 'fluentbit' },
});

// Fluent Bit Configuration for Kubernetes
const configMap = new k8s.core.v1.ConfigMap('fluentbit-config', {
    metadata: {
        namespace: namespace.metadata.name,
        name: 'fluentbit-config',
    },
    data: {
        // The input configuration for Fluent Bit, tailing logs from containers
        'input-kubernetes.conf': `
            [INPUT]
                Name              tail
                Path              /var/log/containers/*.log
                Parser            docker
                Tag               kube.*
                Refresh_Interval  5
                Mem_Buf_Limit     5MB
                Skip_Long_Lines   On
        `,
        // The output configuration for Fluent Bit, which should point to your PostgreSQL instance
        'output-postgresql.conf': `
            [OUTPUT]
                Name              pgsql
                Match             *
                Host              your-postgres-server.databases.spotahome.com
                Port              5432
                Database          your_database_name
                Table             your_table_name
                User              your_database_user
                Password          your_password
        `,
        // Parser configuration for Docker
        'parsers.conf': `
            [PARSER]
                Name        docker
                Format      json
                Time_Key    time
                Time_Format %Y-%m-%dT%H:%M:%S.%L
                Time_Keep   On
        `,
    },
});

// Define the DaemonSet for Fluent Bit
const fluentBitDaemonSet = new k8s.apps.v1.DaemonSet('fluentbit-daemonset', {
    metadata: {
        namespace: namespace.metadata.name,
    },
    spec: {
        selector: { matchLabels: { app: 'fluentbit' }},
        template: {
            metadata: { labels: { app: 'fluentbit' }},
            spec: {
                containers: [
                    {
                        name: 'fluentbit',
                        image: 'fluent/fluent-bit:latest',
                        volumeMounts: [
                            { name: 'varlog', mountPath: '/var/log' },
                            { name: 'config', mountPath: '/fluent-bit/etc/' },
                        ],
                    },
                ],
                volumes: [
                    { name: 'varlog', hostPath: { path: '/var/log' }},
                    {
                        name: 'config',
                        configMap: { name: 'fluentbit-config' },
                    },
                ],
            },
        },
    },
});

// Export the fluentbit namespace name
export const fluentbitNamespaceName = namespace.metadata.name;
```

In the above Pulumi TypeScript program:

- We create a `Namespace` in Kubernetes to hold our Fluent Bit resources.
- A `ConfigMap` is defined to hold the Fluent Bit configuration, including the inputs to collect logs from all pods and the output to send the logs to your PostgreSQL server. You will need to replace `your-postgres-server.databases.spotahome.com`, `your_database_name`, `your_table_name`,  `your_database_user`, and `your_password` with the actual values you use for your PostgreSQL instance.
- A `DaemonSet` is defined to deploy Fluent Bit to every node in the Kubernetes cluster. The `DaemonSet` uses Fluent Bit's Docker image, mounts the necessary volumes for it to access pod logs and the provided configuration.
- Finally an export is defined to output the namespace's name, which can be useful for querying the cluster's resources.

Remember to replace placeholder values in the Fluent Bit configuration (`output-postgresql.conf` section) with actual credentials, endpoints, and database details as per your `databases.spotahome.com` PostgreSQL setup.

Ensure you have the right permissions to deploy to the Kubernetes cluster and connect it to the PostgreSQL instance. Also, you will need the PostgreSQL output plugin (`pgsql`) to be included in the Fluent Bit image you are using or added if not present.

After deploying this program with Pulumi, Fluent Bit will start collecting logs from Kubernetes and sending them to the PostgreSQL server defined in the output configuration. This centralized logging can help you in monitoring and troubleshooting applications running in your Kubernetes environment.