thaloco/banger
1
Fork 0
Code Pull requests Releases Packages Activity Actions

Speed up VM create with work seeds

Browse source 
Beat VM create wall time without changing VM semantics.

Generate a work-seed ext4 sidecar during image builds and rootfs rebuilds, then clone and resize that seed for each new VM instead of rebuilding /root from scratch. Plumb the new seed artifact through config, runtime metadata, store state, runtime-bundle defaults, doctor checks, and default-image reconciliation so older images still fall back cleanly.

Add a daemon TAP pool to keep idle bridge-attached devices warm, expose stage timing in lifecycle logs, add a create/SSH benchmark script plus Make target, and teach verify.sh that tap-pool-* devices are reusable capacity rather than cleanup leaks.

Validated with go test ./..., make build, ./verify.sh, and make bench-create ARGS="--runs 2".
This commit is contained in:
Thales Maciel 2026-03-18 21:22:12 -03:00
parent a14a80fd6b
commit c8d9a122f9
No known key found for this signature in database
GPG key ID: 33112E6833C34679
24 changed files with 695 additions and 44 deletions
Download patch file Download diff file Expand all files Collapse all files

10
internal/daemon/images.go
View file

@ -60,6 +60,7 @@ func (d *Daemon) BuildImage(ctx context.Context, params api.ImageBuildParams) (i
}
defer logFile.Close()
rootfsPath := filepath.Join(artifactDir, "rootfs.ext4")
workSeedPath := filepath.Join(artifactDir, "work-seed.ext4")
kernelPath := params.KernelPath
if kernelPath == "" {
kernelPath = d.config.DefaultKernel
@ -90,10 +91,17 @@ func (d *Daemon) BuildImage(ctx context.Context, params api.ImageBuildParams) (i
}
op.stage("launch_builder", "build_log_path", buildLogPath, "artifact_dir", artifactDir)
if err := d.runImageBuild(ctx, spec); err != nil {
_ = logFile.Sync()
_ = os.RemoveAll(artifactDir)
return model.Image{}, err
}
if err := system.BuildWorkSeedImage(ctx, d.runner, rootfsPath, workSeedPath); err != nil {
_ = logFile.Sync()
_ = os.RemoveAll(artifactDir)
return model.Image{}, err
}
if err := writePackagesMetadata(rootfsPath, d.config.DefaultPackagesFile); err != nil {
_ = logFile.Sync()
_ = os.RemoveAll(artifactDir)
return model.Image{}, err
}
@ -103,6 +111,7 @@ func (d *Daemon) BuildImage(ctx context.Context, params api.ImageBuildParams) (i
Managed: true,
ArtifactDir: artifactDir,
RootfsPath: rootfsPath,
WorkSeedPath: workSeedPath,
KernelPath: kernelPath,
InitrdPath: initrdPath,
ModulesDir: modulesDir,
@ -119,6 +128,7 @@ func (d *Daemon) BuildImage(ctx context.Context, params api.ImageBuildParams) (i
if d.logger != nil {
d.logger.Info("image build log preserved", append(imageLogAttrs(image), "build_log_path", buildLogPath)...)
}
_ = logFile.Sync()
return image, nil
}