k3s/pkg/agent/run.go
2020-04-18 23:59:08 -07:00

236 lines
5.8 KiB
Go

package agent
import (
"context"
"errors"
"io/ioutil"
"os"
"path/filepath"
"strings"
"time"
"k8s.io/apimachinery/pkg/labels"
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/loadbalancer"
"github.com/rancher/k3s/pkg/agent/netpol"
"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/sirupsen/logrus"
"k8s.io/apimachinery/pkg/api/equality"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
v1 "k8s.io/client-go/kubernetes/typed/core/v1"
"k8s.io/client-go/tools/clientcmd"
)
const (
InternalIPLabel = "k3s.io/internal-ip"
ExternalIPLabel = "k3s.io/external-ip"
HostnameLabel = "k3s.io/hostname"
)
func run(ctx context.Context, cfg cmds.Agent, lb *loadbalancer.LoadBalancer) error {
nodeConfig := config.Get(ctx, cfg)
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 := tunnel.Setup(ctx, nodeConfig, lb.Update); err != nil {
return err
}
if err := agent.Agent(&nodeConfig.AgentConfig); err != nil {
return err
}
coreClient, err := coreClient(nodeConfig.AgentConfig.KubeConfigKubelet)
if err != nil {
return err
}
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
}
}
cfg.DataDir = filepath.Join(cfg.DataDir, "agent")
os.MkdirAll(cfg.DataDir, 0700)
lb, err := loadbalancer.Setup(ctx, cfg)
if err != nil {
return err
}
if lb != nil {
cfg.ServerURL = lb.LoadBalancerServerURL()
}
for {
newToken, err := clientaccess.NormalizeAndValidateTokenForUser(cfg.ServerURL, 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
break
}
systemd.SdNotify(true, "READY=1\n")
return run(ctx, cfg, lb)
}
func validate() 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 configureNode(ctx context.Context, agentConfig *daemonconfig.Agent, nodes v1.NodeInterface) error {
for {
node, err := nodes.Get(ctx, agentConfig.NodeName, metav1.GetOptions{})
if err != nil {
logrus.Infof("Waiting for kubelet to be ready on node %s: %v", agentConfig.NodeName, err)
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)
}