feat(deviceplugin): persist container GPU config to file for child an… - #2660
feat(deviceplugin): persist container GPU config to file for child an…#2660SanyamRana wants to merge 5 commits into
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…d SSH processes Write a persistent config.json into the container cache directory during Allocate to ensure GPU memory isolation is retained across child processes, su/sudo sessions, and SSH login shells where process environment variables are scrubbed. - Add pkg/device-plugin/nvidiadevice/nvinternal/plugin/containerconfig package defining ContainerConfig, DeviceLimitConfig, and atomic WriteConfig helper. - Update Allocate in server.go to write config.json into cacheFileHostDirectory. - Preserve all existing environment variable injection for full backward compatibility. - Add comprehensive unit tests covering serialization, atomic write, and error cases. Fixes Project-HAMi#2125 Signed-off-by: Sanyam Rana <sanyamrana26@gmail.com>
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📝 WalkthroughWalkthroughThe change adds a versioned GPU container configuration schema and an atomic JSON writer. ChangesGPU container configuration
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🟡 Moderate · up to The PR adds a POSIX-specific test that may fail to compile on non-POSIX build targets, so the change is not fully merge-ready until the test is properly constrained or the platform limitation is explicitly accepted. Sequence Diagram(s)sequenceDiagram
participant Allocate
participant WriteConfig
participant ContainerFilesystem
Allocate->>WriteConfig: pass device limits and runtime settings
WriteConfig->>ContainerFilesystem: atomically write config.json
ContainerFilesystem-->>WriteConfig: return write result
WriteConfig-->>Allocate: return success or error
Allocate-->>Allocate: log warning on configuration failure
Possibly related PRs
Suggested reviewers: Poem
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Inline comments:
In `@pkg/device-plugin/nvidiadevice/nvinternal/plugin/containerconfig/config.go`:
- Around line 126-128: After os.WriteFile in the temporary container-config
creation flow, explicitly apply mode 0644 with os.Chmod and return a wrapped
error if it fails before os.Rename executes. Add a POSIX test covering a
restrictive umask and verifying the resulting config.json remains readable with
mode 0644.
In `@pkg/device-plugin/nvidiadevice/nvinternal/plugin/server.go`:
- Around line 893-899: Change the config.json handling around
containerconfig.WriteConfig so it writes to a root-owned host path outside the
mode-0777 cacheFileHostDirectory. Mount that file at
${hostHookPath}/vgpu/config.json with ReadOnly enabled, while retaining
cacheFileHostDirectory as the separate read-write mount.
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pkg/device-plugin/nvidiadevice/nvinternal/plugin/containerconfig/config.gopkg/device-plugin/nvidiadevice/nvinternal/plugin/containerconfig/config_test.gopkg/device-plugin/nvidiadevice/nvinternal/plugin/server.go
In WriteConfig, after os.WriteFile, explicitly apply mode 0644 with os.Chmod to ensure config.json remains readable by unprivileged container users even when the device plugin daemon runs under a restrictive process umask (e.g. 0077). - Explicitly call os.Chmod(tmpPath, 0644) and return wrapped error on failure. - Add TestWriteConfig_RestrictiveUmask in config_posix_test.go covering umask 0077. Signed-off-by: Sanyam Rana <sanyamrana26@gmail.com>
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worked on one of the flagged sections of code
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Actionable comments posted: 1
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Inline comments:
In
`@pkg/device-plugin/nvidiadevice/nvinternal/plugin/containerconfig/config_posix_test.go`:
- Line 1: Replace the !windows build constraint in config_posix_test.go with a
unix-only constraint so the test is excluded from Plan 9 and other non-Unix
targets while remaining enabled on Unix systems.
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pkg/device-plugin/nvidiadevice/nvinternal/plugin/containerconfig/config.gopkg/device-plugin/nvidiadevice/nvinternal/plugin/containerconfig/config_posix_test.go
🚧 Files skipped from review as they are similar to previous changes (1)
- pkg/device-plugin/nvidiadevice/nvinternal/plugin/containerconfig/config.go
cacheFileHostDirectory is mode 0777 and is mounted read-write into the
container. Writing config.json there allowed a root container process to
remove or replace it (e.g. symlink to /dev/null), silently defeating its
own GPU memory limits.
Move config.json to a separate root-owned host directory (mode 0755) under
{hostHookPath}/vgpu/configs/{podUID}_{containerName}/ and bind-mount it
into the container as a read-only file at {hostHookPath}/vgpu/config.json.
The read-write cacheFileHostDirectory mount is retained unchanged for the
libvgpu.so shared-memory cache files it needs to create at runtime.
Signed-off-by: Sanyam Rana <sanyamrana26@gmail.com>
Change //go:build !windows to //go:build unix on config_posix_test.go. The !windows constraint would include Plan 9, JS/WASM, and other non-Unix targets that lack syscall.Umask, causing build failures there. The unix constraint precisely targets Linux, macOS, FreeBSD, and other POSIX systems where the test semantics are guaranteed. Signed-off-by: Sanyam Rana <sanyamrana26@gmail.com>
Add an explicit lookup-order contract to the ContainerConfig Go doc comment so the libvgpu.so consumer implementer has the agreed policy at the call site without needing to trace the issue discussion: 1. env var present -> use env var (highest priority, backward compat) 2. env var absent -> read config.json field (SSH/su fallback) 3. both absent -> no limit (unchanged current behavior) Also documents that a missing/unreadable config.json must be treated as case (3) silently, never as a hard error. Follows up on the design discussion in Project-HAMi#2125. Signed-off-by: Sanyam Rana <sanyamrana26@gmail.com>
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2 participants
What type of PR is this?
/kind feature
What this PR does / why we need it:
In HAMi, GPU memory and compute isolation are currently configured via environment variables (
CUDA_DEVICE_MEMORY_LIMIT_*,CUDA_DEVICE_SM_LIMIT, andCUDA_DEVICE_MEMORY_SHARED_CACHE) injected by the device plugin duringAllocate.However, when child processes,
su/sudosessions, or SSH login shells start within a container, PAM and shell runtimes scrub process environment variables. Consequently,libvgpu.so(preloaded via/etc/ld.so.preload) cannot find the memory limits viagetenv()and falls back to unconstrained GPU access.This PR introduces a file-based configuration mechanism to persist container allocation limits to disk:
pkg/device-plugin/nvidiadevice/nvinternal/plugin/containerconfigdefiningContainerConfig,DeviceLimitConfig, and an atomicWriteConfighelper (using temp-file + intra-directory rename with mode0644).Allocateinserver.goto writeconfig.jsoninto the container's cache directory (cacheFileHostDirectory), which is already bind-mounted to{hostHookPath}/vgpu/inside the container.libvgpu.sobinaries continue to work unchanged.config_test.gocovering JSON serialization, file permissions, idempotency, and error handling.Which issue(s) this PR fixes:
Fixes #2125
Special notes for your reviewer:
cacheFileHostDirectorymakesconfig.jsonavailable inside the container at{hostHookPath}/vgpu/config.jsonvia the existing container volume mount (no new mounts required).0644so both root and non-root users (e.g., unprivileged SSH logins) can read the configuration file withoutEACCESerrors.libvgpu.so(HAMi-core) can now fall back to reading{hostHookPath}/vgpu/config.jsonwhengetenv("CUDA_DEVICE_MEMORY_LIMIT_...")returns empty.Does this PR introduce a user-facing change?: