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agent.go
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/
agent.go
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package agent
import (
"bufio"
"context"
"math/rand"
"os"
"path/filepath"
"strings"
"time"
"github.com/rancher/k3s/pkg/daemons/config"
"github.com/sirupsen/logrus"
"k8s.io/apimachinery/pkg/util/net"
"k8s.io/apiserver/pkg/util/logs"
app2 "k8s.io/kubernetes/cmd/kube-proxy/app"
"k8s.io/kubernetes/cmd/kubelet/app"
_ "k8s.io/kubernetes/pkg/client/metrics/prometheus" // for client metric registration
_ "k8s.io/kubernetes/pkg/version/prometheus" // for version metric registration
)
func Agent(config *config.Agent) error {
rand.Seed(time.Now().UTC().UnixNano())
kubelet(config)
kubeProxy(config)
return nil
}
func kubeProxy(config *config.Agent) {
args := []string{
"--proxy-mode", "iptables",
"--healthz-bind-address", "127.0.0.1",
"--kubeconfig", config.KubeConfig,
"--cluster-cidr", config.ClusterCIDR.String(),
}
args = append(args, config.ExtraKubeletArgs...)
command := app2.NewProxyCommand()
command.SetArgs(args)
go func() {
err := command.Execute()
logrus.Fatalf("kube-proxy exited: %v", err)
}()
}
func kubelet(cfg *config.Agent) {
command := app.NewKubeletCommand(context.Background().Done())
logs.InitLogs()
defer logs.FlushLogs()
args := []string{
"--healthz-bind-address", "127.0.0.1",
"--read-only-port", "0",
"--allow-privileged=true",
"--cluster-domain", "cluster.local",
"--kubeconfig", cfg.KubeConfig,
"--eviction-hard", "imagefs.available<5%,nodefs.available<5%",
"--eviction-minimum-reclaim", "imagefs.available=10%,nodefs.available=10%",
"--fail-swap-on=false",
//"--cgroup-root", "/k3s",
"--cgroup-driver", "cgroupfs",
}
if cfg.RootDir != "" {
args = append(args, "--root-dir", cfg.RootDir)
args = append(args, "--cert-dir", filepath.Join(cfg.RootDir, "pki"))
args = append(args, "--seccomp-profile-root", filepath.Join(cfg.RootDir, "seccomp"))
}
if cfg.CNIConfDir != "" {
args = append(args, "--cni-conf-dir", cfg.CNIConfDir)
}
if cfg.CNIBinDir != "" {
args = append(args, "--cni-bin-dir", cfg.CNIBinDir)
}
if len(cfg.ClusterDNS) > 0 {
args = append(args, "--cluster-dns", cfg.ClusterDNS.String())
}
if cfg.RuntimeSocket != "" {
args = append(args, "--container-runtime", "remote")
args = append(args, "--container-runtime-endpoint", cfg.RuntimeSocket)
}
if cfg.ListenAddress != "" {
args = append(args, "--address", cfg.ListenAddress)
}
if cfg.CACertPath != "" {
args = append(args, "--anonymous-auth=false", "--client-ca-file", cfg.CACertPath)
}
if cfg.NodeName != "" {
args = append(args, "--hostname-override", cfg.NodeName)
}
defaultIP, err := net.ChooseHostInterface()
if err != nil || defaultIP.String() != cfg.NodeIP {
args = append(args, "--node-ip", cfg.NodeIP)
}
if !hasCFS() {
logrus.Warn("Disabling CPU quotas due to missing cpu.cfs_period_us")
args = append(args, "--cpu-cfs-quota=false")
}
args = append(args, cfg.ExtraKubeletArgs...)
command.SetArgs(args)
go func() {
logrus.Infof("Running kubelet %s", config.ArgString(args))
logrus.Fatalf("kubelet exited: %v", command.Execute())
}()
}
func hasCFS() bool {
f, err := os.Open("/proc/self/cgroup")
if err != nil {
return false
}
defer f.Close()
scan := bufio.NewScanner(f)
for scan.Scan() {
parts := strings.Split(scan.Text(), ":")
if len(parts) < 3 {
continue
}
systems := strings.Split(parts[1], ",")
for _, system := range systems {
if system == "cpu" {
p := filepath.Join("/sys/fs/cgroup", parts[1], parts[2], "cpu.cfs_period_us")
if _, err := os.Stat(p); err == nil {
return true
}
}
}
}
return false
}