Question 1

How do I set up LambCI for a private GitHub repository?

Accepted Answer

You need a GitHub OAuth token with full repo access for private repos, as the README specifies only the 'repo' scope works. Then, deploy via CloudFormation and add the webhook URL with the secret for secure triggering.

Question 2

Can LambCI run Docker builds?

Accepted Answer

Yes, but not directly in Lambda due to constraints. LambCI can delegate builds to Docker containers on ECS clusters, as mentioned in the 'Extending with ECS' section, though this requires additional setup.

Question 3

LambCI vs GitHub Actions: which is better for serverless CI?

Accepted Answer

LambCI offers deeper AWS integration and cost savings for idle time, but GitHub Actions provides a more managed experience with native GitHub features. LambCI is in maintenance mode, so Actions might be more future-proof.

Question 4

How to configure Slack notifications in LambCI?

Accepted Answer

Create a Slack bot token, specify it in the CloudFormation parameters or DynamoDB config, and set the channel in notifications.slack.channel. The README includes detailed steps for bot creation and config overrides.

Question 5

What are the costs of running LambCI on AWS?

Accepted Answer

Costs are based on Lambda invocation time, S3 storage, and DynamoDB usage, with zero cost when idle. The README emphasizes 100% utilization, but expenses scale with build frequency and duration.

Question 6

How to handle builds that need more than 15 minutes?

Accepted Answer

Use the ECS extension to run builds in Docker containers, bypassing Lambda's time limit. The README notes this requires additional documentation and setup via the lambci/ecs repo.

Question 7

Is LambCI secure for private repositories?

Accepted Answer

Yes, with configurable security: set inheritSecrets to false for forked repos, use random S3 filenames, and clear /tmp by default. The README advises caution with secret exposure and provides email for security issues.

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