k3s/pkg/agent/run.go
Brad Davidson c0d129003b Handle loadbalancer port in TIME_WAIT
If the port wanted by the client load balancer is in TIME_WAIT, startup
will fail. Set SO_REUSEPORT so that it can be listened on again
immediately.

The configurable Listen call wants a context, so plumb that through as
well.

Signed-off-by: Brad Davidson <brad.davidson@rancher.com>
2021-03-08 17:05:25 -08:00

338 lines
8.8 KiB
Go

package agent
import (
"context"
"errors"
"fmt"
"io/ioutil"
"net/url"
"os"
"path/filepath"
"strings"
"time"
"github.com/containerd/cgroups"
cgroupsv2 "github.com/containerd/cgroups/v2"
systemd "github.com/coreos/go-systemd/daemon"
"github.com/rancher/k3s/pkg/agent/config"
"github.com/rancher/k3s/pkg/agent/containerd"
"github.com/rancher/k3s/pkg/agent/flannel"
"github.com/rancher/k3s/pkg/agent/netpol"
"github.com/rancher/k3s/pkg/agent/proxy"
"github.com/rancher/k3s/pkg/agent/syssetup"
"github.com/rancher/k3s/pkg/agent/tunnel"
"github.com/rancher/k3s/pkg/cli/cmds"
"github.com/rancher/k3s/pkg/clientaccess"
"github.com/rancher/k3s/pkg/daemons/agent"
daemonconfig "github.com/rancher/k3s/pkg/daemons/config"
"github.com/rancher/k3s/pkg/nodeconfig"
"github.com/rancher/k3s/pkg/rootless"
"github.com/rancher/k3s/pkg/version"
"github.com/sirupsen/logrus"
"k8s.io/apimachinery/pkg/api/equality"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/client-go/kubernetes"
v1 "k8s.io/client-go/kubernetes/typed/core/v1"
"k8s.io/client-go/tools/clientcmd"
"k8s.io/controller-manager/app"
)
var (
InternalIPLabel = version.Program + ".io/internal-ip"
ExternalIPLabel = version.Program + ".io/external-ip"
HostnameLabel = version.Program + ".io/hostname"
)
const (
dockershimSock = "unix:///var/run/dockershim.sock"
containerdSock = "unix:///run/k3s/containerd/containerd.sock"
)
// setupCriCtlConfig creates the crictl config file and populates it
// with the given data from config.
func setupCriCtlConfig(cfg cmds.Agent, nodeConfig *daemonconfig.Node) error {
cre := nodeConfig.ContainerRuntimeEndpoint
if cre == "" {
switch {
case cfg.Docker:
cre = dockershimSock
default:
cre = containerdSock
}
}
agentConfDir := filepath.Join(cfg.DataDir, "agent", "etc")
if _, err := os.Stat(agentConfDir); os.IsNotExist(err) {
if err := os.MkdirAll(agentConfDir, 0700); err != nil {
return err
}
}
crp := "runtime-endpoint: " + cre + "\n"
return ioutil.WriteFile(agentConfDir+"/crictl.yaml", []byte(crp), 0600)
}
func run(ctx context.Context, cfg cmds.Agent, proxy proxy.Proxy) error {
nodeConfig := config.Get(ctx, cfg, proxy)
if err := setupCriCtlConfig(cfg, nodeConfig); err != nil {
return err
}
if !nodeConfig.NoFlannel {
if err := flannel.Prepare(ctx, nodeConfig); err != nil {
return err
}
}
if !nodeConfig.Docker && nodeConfig.ContainerRuntimeEndpoint == "" {
if err := containerd.Run(ctx, nodeConfig); err != nil {
return err
}
}
if err := setupTunnelAndRunAgent(ctx, nodeConfig, cfg, proxy); err != nil {
return err
}
coreClient, err := coreClient(nodeConfig.AgentConfig.KubeConfigKubelet)
if err != nil {
return err
}
app.WaitForAPIServer(coreClient, 30*time.Second)
if !nodeConfig.NoFlannel {
if err := flannel.Run(ctx, nodeConfig, coreClient.CoreV1().Nodes()); err != nil {
return err
}
}
if err := configureNode(ctx, &nodeConfig.AgentConfig, coreClient.CoreV1().Nodes()); err != nil {
return err
}
if !nodeConfig.AgentConfig.DisableNPC {
if err := netpol.Run(ctx, nodeConfig); err != nil {
return err
}
}
<-ctx.Done()
return ctx.Err()
}
func coreClient(cfg string) (kubernetes.Interface, error) {
restConfig, err := clientcmd.BuildConfigFromFlags("", cfg)
if err != nil {
return nil, err
}
return kubernetes.NewForConfig(restConfig)
}
func Run(ctx context.Context, cfg cmds.Agent) error {
if err := validate(); err != nil {
return err
}
syssetup.Configure()
if cfg.Rootless && !cfg.RootlessAlreadyUnshared {
if err := rootless.Rootless(cfg.DataDir); err != nil {
return err
}
}
agentDir := filepath.Join(cfg.DataDir, "agent")
if err := os.MkdirAll(agentDir, 0700); err != nil {
return err
}
proxy, err := proxy.NewSupervisorProxy(ctx, !cfg.DisableLoadBalancer, agentDir, cfg.ServerURL, cfg.LBServerPort)
if err != nil {
return err
}
for {
newToken, err := clientaccess.ParseAndValidateTokenForUser(proxy.SupervisorURL(), cfg.Token, "node")
if err != nil {
logrus.Error(err)
select {
case <-ctx.Done():
return ctx.Err()
case <-time.After(2 * time.Second):
}
continue
}
cfg.Token = newToken.String()
break
}
systemd.SdNotify(true, "READY=1\n")
return run(ctx, cfg, proxy)
}
func validate() error {
if cgroups.Mode() == cgroups.Unified {
return validateCgroupsV2()
}
return validateCgroupsV1()
}
func validateCgroupsV1() error {
cgroups, err := ioutil.ReadFile("/proc/self/cgroup")
if err != nil {
return err
}
if !strings.Contains(string(cgroups), "cpuset") {
logrus.Warn(`Failed to find cpuset cgroup, you may need to add "cgroup_enable=cpuset" to your linux cmdline (/boot/cmdline.txt on a Raspberry Pi)`)
}
if !strings.Contains(string(cgroups), "memory") {
msg := "ailed to find memory cgroup, you may need to add \"cgroup_memory=1 cgroup_enable=memory\" to your linux cmdline (/boot/cmdline.txt on a Raspberry Pi)"
logrus.Error("F" + msg)
return errors.New("f" + msg)
}
return nil
}
func validateCgroupsV2() error {
manager, err := cgroupsv2.LoadManager("/sys/fs/cgroup", "/")
if err != nil {
return err
}
controllers, err := manager.RootControllers()
if err != nil {
return err
}
m := make(map[string]struct{})
for _, controller := range controllers {
m[controller] = struct{}{}
}
for _, controller := range []string{"cpu", "cpuset", "memory"} {
if _, ok := m[controller]; !ok {
return fmt.Errorf("failed to find %s cgroup (v2)", controller)
}
}
return nil
}
func configureNode(ctx context.Context, agentConfig *daemonconfig.Agent, nodes v1.NodeInterface) error {
count := 0
for {
node, err := nodes.Get(ctx, agentConfig.NodeName, metav1.GetOptions{})
if err != nil {
if count%30 == 0 {
logrus.Infof("Waiting for kubelet to be ready on node %s: %v", agentConfig.NodeName, err)
}
count++
time.Sleep(1 * time.Second)
continue
}
newLabels, updateMutables := updateMutableLabels(agentConfig, node.Labels)
updateAddresses := !agentConfig.DisableCCM
if updateAddresses {
newLabels, updateAddresses = updateAddressLabels(agentConfig, newLabels)
}
// inject node config
updateNode, err := nodeconfig.SetNodeConfigAnnotations(node)
if err != nil {
return err
}
if updateAddresses || updateMutables {
node.Labels = newLabels
updateNode = true
}
if updateNode {
if _, err := nodes.Update(ctx, node, metav1.UpdateOptions{}); err != nil {
logrus.Infof("Failed to update node %s: %v", agentConfig.NodeName, err)
select {
case <-ctx.Done():
return ctx.Err()
case <-time.After(time.Second):
continue
}
}
logrus.Infof("labels have been set successfully on node: %s", agentConfig.NodeName)
} else {
logrus.Infof("labels have already set on node: %s", agentConfig.NodeName)
}
break
}
return nil
}
func updateMutableLabels(agentConfig *daemonconfig.Agent, nodeLabels map[string]string) (map[string]string, bool) {
result := map[string]string{}
for _, m := range agentConfig.NodeLabels {
var (
v string
p = strings.SplitN(m, `=`, 2)
k = p[0]
)
if len(p) > 1 {
v = p[1]
}
result[k] = v
}
result = labels.Merge(nodeLabels, result)
return result, !equality.Semantic.DeepEqual(nodeLabels, result)
}
func updateAddressLabels(agentConfig *daemonconfig.Agent, nodeLabels map[string]string) (map[string]string, bool) {
result := map[string]string{
InternalIPLabel: agentConfig.NodeIP,
HostnameLabel: agentConfig.NodeName,
}
if agentConfig.NodeExternalIP != "" {
result[ExternalIPLabel] = agentConfig.NodeExternalIP
}
result = labels.Merge(nodeLabels, result)
return result, !equality.Semantic.DeepEqual(nodeLabels, result)
}
// setupTunnelAndRunAgent should start the setup tunnel before starting kubelet and kubeproxy
// there are special case for etcd agents, it will wait until it can find the apiaddress from
// the address channel and update the proxy with the servers addresses, if in rke2 we need to
// start the agent before the tunnel is setup to allow kubelet to start first and start the pods
func setupTunnelAndRunAgent(ctx context.Context, nodeConfig *daemonconfig.Node, cfg cmds.Agent, proxy proxy.Proxy) error {
var agentRan bool
if cfg.ETCDAgent {
// only in rke2 run the agent before the tunnel setup and check for that later in the function
if proxy.IsAPIServerLBEnabled() {
if err := agent.Agent(&nodeConfig.AgentConfig); err != nil {
return err
}
agentRan = true
}
select {
case address := <-cfg.APIAddressCh:
cfg.ServerURL = address
u, err := url.Parse(cfg.ServerURL)
if err != nil {
logrus.Warn(err)
}
proxy.Update([]string{fmt.Sprintf("%s:%d", u.Hostname(), nodeConfig.ServerHTTPSPort)})
case <-ctx.Done():
return ctx.Err()
}
}
if err := tunnel.Setup(ctx, nodeConfig, proxy); err != nil {
return err
}
if !agentRan {
return agent.Agent(&nodeConfig.AgentConfig)
}
return nil
}