runs-on/action

RunsOn Action for magic caching, and more. This action is required if you are using the magic caching feature of RunsOn (extras=s3-cache job label).

Usage

jobs:
  build:
    runs-on: runs-on=${{ github.run_id }}/runner=2cpu-linux-x64/extras=s3-cache
    steps:
      - uses: runs-on/action@v2
      - other steps

When RunsOn fails a job because AWS is reclaiming its EC2 Spot instance, the post step skips all of its work (cost report, metrics summary, and sticky cache shutdown). The runner then has time to report the interruption before the instance shuts down, and RunsOn discards the sticky disk changes of an interrupted job anyway.

Options

show_env

Show all environment variables available to actions (used for debugging purposes).

jobs:
  build:
    runs-on: runs-on=${{ github.run_id }}/runner=2cpu-linux-x64/extras=s3-cache
    steps:
      - uses: runs-on/action@v2
        with:
          show_env: true

Possible values:

• true - Show all environment variables
• false - Don't show environment variables (default)

show_costs

Displays how much it cost to run that workflow job, and compares it with a similar GitHub-hosted runner.

RunsOn v3.4.0 and later. The RunsOn agent reports the cost itself, at the very end of the job, in the "Complete runner" step. This happens for every job, with or without this action, so show_costs only chooses how it is displayed. The estimate:

• covers EC2 (on-demand or spot), the root EBS volume, and any sticky disk, from when the instance starts (or the job starts, on a warm-pool instance) until the job ends;
• uses prices your RunsOn control plane already resolves, so the runner makes no pricing or EC2 API calls and needs no internet access.

Example output in the "Complete runner" step:

💰 Estimated cost: $0.0034 (GitHub-hosted: $0.0120)
| Metric                   | Value                                      |
| ------------------------ | ------------------------------------------ |
| Instance type            | c7a.large                                  |
| Instance lifecycle       | spot                                       |
| Region                   | us-east-1                                  |
| Availability zone        | us-east-1b                                 |
| Platform                 | linux/x64, 2 vCPUs                         |
| Billed duration          | 2m45s (boot, job, and 5s for shutdown)     |
| Job duration             | 1m44s                                      |
| EC2                      | $0.0014                                    |
| EBS root volume          | $0.0008                                    |
| EBS sticky disk          | $0.0012                                    |
| Total                    | $0.0034                                    |
| GitHub-hosted equivalent | $0.0120 (job duration rounded up to 2 min) |
| Savings                  | $0.0086 (71.7%)                            |

The GitHub-hosted equivalent uses GitHub's published per-minute price for the smallest runner with at least as many vCPUs. It bills only the job duration, rounded up to the next whole minute as GitHub does, since GitHub doesn't bill runner boot.

Earlier RunsOn versions. The action's post step computes the cost from https://ec2-pricing.runs-on.com, for both on-demand and spot pricing across all regions and availability zones. It covers EC2 only, up to the post step. When the cost API has no matching pricing data, cost reporting logs an informational message and skips the cost table and job summary. This includes unsupported regions and unavailable instance or zone prices. Other API and network failures still warn.

Possible values:

• inline - Display costs in the log output (default)
• summary - Display costs in the log output and in the GitHub job summary
• Any other value - Disables the feature

When runs-on/action is invoked more than once in the same job, only the first invocation with cost reporting enabled calculates and displays the job cost. Later invocations skip duplicate reporting automatically. An invocation with cost reporting disabled does not prevent a later enabled invocation from reporting.

metrics

Note: this is currently only available with a development release of RunsOn. This will be fully functional with v2.8.4+

Send additional metrics using CloudWatch agent.

Supported metrics:

Metric Type	Available Metrics
cpu	usage_user, usage_system
network	bytes_recv, bytes_sent
memory	used_percent
disk	used_percent, inodes_used, free, total
io	io_time, reads, writes

jobs:
  build:
    runs-on: runs-on=${{ github.run_id }}/runner=2cpu-linux-x64/extras=s3-cache
    steps:
      - uses: runs-on/action@v2
        with:
          metrics: cpu,network,memory,disk,io

Possible values:

• cpu - CPU usage metrics (usage_user, usage_system)
• network - Network metrics (bytes_recv, bytes_sent)
• memory - Memory metrics (used_percent)
• disk - Disk metrics (used_percent, inodes_used, free, total)
• io - I/O metrics (io_time, reads, writes)
• Comma-separated combinations (e.g., cpu,network,memory,disk,io)
• Empty string - No additional metrics (default)

Disk metrics are published for each of /, /tmp, /var/lib/docker and /home/runner that is a mount point, with the InstanceId, path, fstype, device and VolumeId dimensions. VolumeId is the EBS volume behind that mount, so a sticky disk or snapshot volume mounted at /var/lib/docker reports its own volume. Mounts that aren't on an EBS volume have no VolumeId, for example tmpfs, overlay, or the md0 array RunsOn builds from local instance storage. Earlier versions published disk metrics without the device and VolumeId dimensions, so update dashboards or alarms that match on the previous set.

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