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66f3ffdd4a
Drop the Kubernetes manifests as static files clean up (this is only needed for upgrades from 1.2.x). Fix Talos handling of cgroup hierarchy: if started in container in a non-root cgroup hiearachy, use that to handle proper cgroup paths. Add a test for a simple TinK mode (Talos-in-Kubernetes). Update the docs. Fixes #8274 Signed-off-by: Andrey Smirnov <andrey.smirnov@siderolabs.com>
59 lines
1.6 KiB
Go
59 lines
1.6 KiB
Go
// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this
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// file, You can obtain one at http://mozilla.org/MPL/2.0/.
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// Package cgroup provides cgroup utilities to handle nested cgroups.
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//
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// When Talos runs in a container, it might either share or not share the host cgroup namespace.
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// If the cgroup namespace is not shared, PID 1 will appear in cgroup '/', otherwise it will be
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// part of some pre-existing cgroup hierarchy.
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//
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// When Talos is running in a non-container mode, it is always at the root of the cgroup hierarchy.
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//
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// This package provides a transparent way to handle nested cgroups by providing a Path() function
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// which returns the correct cgroup path based on the cgroup hierarchy available.
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package cgroup
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import (
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"path/filepath"
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"github.com/containerd/cgroups/v3"
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"github.com/containerd/cgroups/v3/cgroup2"
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)
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var root = "/"
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// InitRoot initializes the root cgroup path.
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//
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// This function should be called once at the beginning of the program, after the cgroup
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// filesystem is mounted.
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//
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// This function only supports cgroupv2 nesting.
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func InitRoot() error {
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if cgroups.Mode() != cgroups.Unified {
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return nil
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}
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var err error
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root, err = cgroup2.NestedGroupPath("/")
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return err
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}
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// Root returns the root cgroup path.
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func Root() string {
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return root
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}
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// Path returns the path to the cgroup.
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//
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// This function handles the case when the cgroups are nested.
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func Path(cgroupPath string) string {
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if cgroups.Mode() != cgroups.Unified {
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return cgroupPath
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}
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return filepath.Join(root, cgroupPath)
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}
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