Build Your First Pipeline

Create a simple log processing pipeline using the Expanso Cloud pipeline builder.

What You'll Build

A pipeline that:

1. Reads log files from your node
2. Filters for ERROR-level logs
3. Outputs to stdout (visible in daemon logs)

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Create the Pipeline

1. In your network, go to Pipelines tab
2. Click Create Pipeline
3. Enter name: error-log-filter
4. Click Open Pipeline Builder

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Configure Input

1. Click Add Input
2. Search for and select File
3. Configure:

   paths:
     - /var/log/*.log

4. Click Save

This reads all .log files from /var/log/.

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Add Processor

1. Click + to add a processor
2. Select Mapping (uses Bloblang)
3. Add this filter:

   # Only keep ERROR logs
   root = if this.contains("ERROR") {
     this
   } else {
     deleted()
   }

4. Click Save

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Configure Output

1. Click Add Output
2. Select STDOUT
3. Configure:

   codec: lines

4. Click Save

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Deploy Pipeline

1. Click Save & Deploy
2. Select your node (or use label selectors)
3. Click Deploy

The pipeline deploys to your node within seconds!

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What's Next?

👉 View Results & Monitor

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Tips

Visual flow: Your pipeline shows: File → Filter → STDOUT

Edit anytime: Click the pipeline to edit and redeploy

Multiple outputs: Add more outputs to send data to multiple destinations

Learn Bloblang: See Bloblang Guide for advanced transformations