mirror of https://github.com/k3s-io/k3s
130 lines
4.4 KiB
Go
130 lines
4.4 KiB
Go
//go:build linux
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// +build linux
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package containerd
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import (
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"context"
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"os"
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"github.com/containerd/containerd"
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overlayutils "github.com/containerd/containerd/snapshots/overlay/overlayutils"
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fuseoverlayfs "github.com/containerd/fuse-overlayfs-snapshotter"
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stargz "github.com/containerd/stargz-snapshotter/service"
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"github.com/docker/docker/pkg/parsers/kernel"
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"github.com/k3s-io/k3s/pkg/agent/templates"
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util2 "github.com/k3s-io/k3s/pkg/agent/util"
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"github.com/k3s-io/k3s/pkg/cgroups"
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"github.com/k3s-io/k3s/pkg/daemons/config"
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"github.com/k3s-io/k3s/pkg/version"
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"github.com/opencontainers/runc/libcontainer/userns"
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"github.com/pkg/errors"
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"github.com/rancher/wharfie/pkg/registries"
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"github.com/sirupsen/logrus"
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"golang.org/x/sys/unix"
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"k8s.io/kubernetes/pkg/kubelet/util"
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)
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const socketPrefix = "unix://"
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func getContainerdArgs(cfg *config.Node) []string {
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args := []string{
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"containerd",
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"-c", cfg.Containerd.Config,
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"-a", cfg.Containerd.Address,
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"--state", cfg.Containerd.State,
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"--root", cfg.Containerd.Root,
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}
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return args
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}
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// setupContainerdConfig generates the containerd.toml, using a template combined with various
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// runtime configurations and registry mirror settings provided by the administrator.
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func setupContainerdConfig(ctx context.Context, cfg *config.Node) error {
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privRegistries, err := registries.GetPrivateRegistries(cfg.AgentConfig.PrivateRegistry)
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if err != nil {
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return err
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}
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isRunningInUserNS := userns.RunningInUserNS()
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_, _, controllers := cgroups.CheckCgroups()
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// "/sys/fs/cgroup" is namespaced
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cgroupfsWritable := unix.Access("/sys/fs/cgroup", unix.W_OK) == nil
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disableCgroup := isRunningInUserNS && (!controllers["cpu"] || !controllers["pids"] || !cgroupfsWritable)
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if disableCgroup {
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logrus.Warn("cgroup v2 controllers are not delegated for rootless. Disabling cgroup.")
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} else {
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// note: this mutatation of the passed agent.Config is later used to set the
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// kubelet's cgroup-driver flag. This may merit moving to somewhere else in order
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// to avoid mutating the configuration while setting up containerd.
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cfg.AgentConfig.Systemd = !isRunningInUserNS && controllers["cpuset"] && os.Getenv("INVOCATION_ID") != ""
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}
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extraRuntimes := findContainerRuntimes(os.DirFS(string(os.PathSeparator)))
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// Verifies if the DefaultRuntime can be found
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if _, ok := extraRuntimes[cfg.DefaultRuntime]; !ok && cfg.DefaultRuntime != "" {
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return errors.Errorf("default runtime %s was not found", cfg.DefaultRuntime)
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}
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var containerdTemplate string
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containerdConfig := templates.ContainerdConfig{
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NodeConfig: cfg,
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DisableCgroup: disableCgroup,
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SystemdCgroup: cfg.AgentConfig.Systemd,
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IsRunningInUserNS: isRunningInUserNS,
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EnableUnprivileged: kernel.CheckKernelVersion(4, 11, 0),
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PrivateRegistryConfig: privRegistries.Registry,
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ExtraRuntimes: extraRuntimes,
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Program: version.Program,
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}
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selEnabled, selConfigured, err := selinuxStatus()
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if err != nil {
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return errors.Wrap(err, "failed to detect selinux")
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}
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switch {
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case !cfg.SELinux && selEnabled:
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logrus.Warn("SELinux is enabled on this host, but " + version.Program + " has not been started with --selinux - containerd SELinux support is disabled")
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case cfg.SELinux && !selConfigured:
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logrus.Warnf("SELinux is enabled for "+version.Program+" but process is not running in context '%s', "+version.Program+"-selinux policy may need to be applied", SELinuxContextType)
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}
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containerdTemplateBytes, err := os.ReadFile(cfg.Containerd.Template)
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if err == nil {
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logrus.Infof("Using containerd template at %s", cfg.Containerd.Template)
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containerdTemplate = string(containerdTemplateBytes)
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} else if os.IsNotExist(err) {
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containerdTemplate = templates.ContainerdConfigTemplate
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} else {
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return err
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}
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parsedTemplate, err := templates.ParseTemplateFromConfig(containerdTemplate, containerdConfig)
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if err != nil {
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return err
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}
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return util2.WriteFile(cfg.Containerd.Config, parsedTemplate)
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}
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func Client(address string) (*containerd.Client, error) {
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addr, _, err := util.GetAddressAndDialer(socketPrefix + address)
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if err != nil {
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return nil, err
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}
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return containerd.New(addr)
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}
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func OverlaySupported(root string) error {
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return overlayutils.Supported(root)
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}
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func FuseoverlayfsSupported(root string) error {
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return fuseoverlayfs.Supported(root)
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}
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func StargzSupported(root string) error {
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return stargz.Supported(root)
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}
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