k3s/pkg/agent/containerd/config_linux.go

115 lines
3.6 KiB
Go

//go:build linux
// +build linux
package containerd
import (
"context"
"io/ioutil"
"os"
"time"
"github.com/opencontainers/runc/libcontainer/userns"
"github.com/pkg/errors"
"github.com/rancher/k3s/pkg/agent/templates"
util2 "github.com/rancher/k3s/pkg/agent/util"
"github.com/rancher/k3s/pkg/cgroups"
"github.com/rancher/k3s/pkg/daemons/config"
"github.com/rancher/k3s/pkg/version"
"github.com/rancher/wharfie/pkg/registries"
"github.com/sirupsen/logrus"
"golang.org/x/sys/unix"
"google.golang.org/grpc"
runtimeapi "k8s.io/cri-api/pkg/apis/runtime/v1alpha2"
"k8s.io/kubernetes/pkg/kubelet/util"
)
func getContainerdArgs(cfg *config.Node) []string {
args := []string{
"containerd",
"-c", cfg.Containerd.Config,
"-a", cfg.Containerd.Address,
"--state", cfg.Containerd.State,
"--root", cfg.Containerd.Root,
}
return args
}
// setupContainerdConfig generates the containerd.toml, using a template combined with various
// runtime configurations and registry mirror settings provided by the administrator.
func setupContainerdConfig(ctx context.Context, cfg *config.Node) error {
privRegistries, err := registries.GetPrivateRegistries(cfg.AgentConfig.PrivateRegistry)
if err != nil {
return err
}
isRunningInUserNS := userns.RunningInUserNS()
_, _, hasCFS, hasPIDs := cgroups.CheckCgroups()
// "/sys/fs/cgroup" is namespaced
cgroupfsWritable := unix.Access("/sys/fs/cgroup", unix.W_OK) == nil
disableCgroup := isRunningInUserNS && (!hasCFS || !hasPIDs || !cgroupfsWritable)
if disableCgroup {
logrus.Warn("cgroup v2 controllers are not delegated for rootless. Disabling cgroup.")
}
var containerdTemplate string
containerdConfig := templates.ContainerdConfig{
NodeConfig: cfg,
DisableCgroup: disableCgroup,
IsRunningInUserNS: isRunningInUserNS,
PrivateRegistryConfig: privRegistries.Registry(),
ExtraRuntimes: findNvidiaContainerRuntimes(os.DirFS(string(os.PathSeparator))),
}
selEnabled, selConfigured, err := selinuxStatus()
if err != nil {
return errors.Wrap(err, "failed to detect selinux")
}
switch {
case !cfg.SELinux && selEnabled:
logrus.Warn("SELinux is enabled on this host, but " + version.Program + " has not been started with --selinux - containerd SELinux support is disabled")
case cfg.SELinux && !selConfigured:
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)
}
containerdTemplateBytes, err := ioutil.ReadFile(cfg.Containerd.Template)
if err == nil {
logrus.Infof("Using containerd template at %s", cfg.Containerd.Template)
containerdTemplate = string(containerdTemplateBytes)
} else if os.IsNotExist(err) {
containerdTemplate = templates.ContainerdConfigTemplate
} else {
return err
}
parsedTemplate, err := templates.ParseTemplateFromConfig(containerdTemplate, containerdConfig)
if err != nil {
return err
}
return util2.WriteFile(cfg.Containerd.Config, parsedTemplate)
}
// criConnection connects to a CRI socket at the given path.
func CriConnection(ctx context.Context, address string) (*grpc.ClientConn, error) {
addr, dialer, err := util.GetAddressAndDialer("unix://" + address)
if err != nil {
return nil, err
}
conn, err := grpc.Dial(addr, grpc.WithInsecure(), grpc.WithTimeout(3*time.Second), grpc.WithContextDialer(dialer), grpc.WithDefaultCallOptions(grpc.MaxCallRecvMsgSize(maxMsgSize)))
if err != nil {
return nil, err
}
c := runtimeapi.NewRuntimeServiceClient(conn)
_, err = c.Version(ctx, &runtimeapi.VersionRequest{
Version: "0.1.0",
})
if err != nil {
conn.Close()
return nil, err
}
return conn, nil
}