mirror of https://github.com/k3s-io/k3s
109 lines
2.3 KiB
Go
109 lines
2.3 KiB
Go
package node
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import (
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"context"
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"strings"
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"github.com/pkg/errors"
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coreclient "github.com/rancher/k3s/types/apis/core/v1"
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"github.com/sirupsen/logrus"
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core "k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/runtime"
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)
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func Register(ctx context.Context) error {
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clients := coreclient.ClientsFrom(ctx)
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h := &handler{
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configCache: clients.ConfigMap.Cache(),
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configClient: clients.ConfigMap,
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}
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clients.Node.OnChange(ctx, "node", h.onChange)
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clients.Node.OnRemove(ctx, "node", h.onRemove)
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return nil
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}
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type handler struct {
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configCache coreclient.ConfigMapClientCache
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configClient coreclient.ConfigMapClient
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}
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func (h *handler) onChange(node *core.Node) (runtime.Object, error) {
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return h.updateHosts(node, false)
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}
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func (h *handler) onRemove(node *core.Node) (runtime.Object, error) {
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return h.updateHosts(node, true)
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}
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func (h *handler) updateHosts(node *core.Node, removed bool) (runtime.Object, error) {
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var (
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newHosts string
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nodeAddress string
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hostsMap map[string]string
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)
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hostsMap = make(map[string]string)
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for _, address := range node.Status.Addresses {
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if address.Type == "InternalIP" {
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nodeAddress = address.Address
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break
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}
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}
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if nodeAddress == "" {
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logrus.Errorf("No InternalIP found for node %s", node.Name)
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return nil, nil
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}
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configMap, err := h.configCache.Get("kube-system", "coredns")
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if err != nil || configMap == nil {
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logrus.Warn(errors.Wrap(err, "Unable to fetch coredns config map"))
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return nil, nil
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}
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hosts := configMap.Data["NodeHosts"]
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for _, line := range strings.Split(hosts, "\n") {
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if line == "" {
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continue
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}
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fields := strings.Fields(line)
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if len(fields) != 2 {
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logrus.Warnf("Unknown format for hosts line [%s]", line)
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continue
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}
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ip := fields[0]
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host := fields[1]
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if host == node.Name {
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if removed {
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continue
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}
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if ip == nodeAddress {
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return nil, nil
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}
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}
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hostsMap[host] = ip
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}
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if !removed {
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hostsMap[node.Name] = nodeAddress
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}
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for host, ip := range hostsMap {
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newHosts += ip + " " + host + "\n"
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}
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configMap.Data["NodeHosts"] = newHosts
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if _, err := h.configClient.Update(configMap); err != nil {
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return nil, err
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}
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var actionType string
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if removed {
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actionType = "Removed"
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} else {
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actionType = "Updated"
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}
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logrus.Infof("%s coredns node hosts entry [%s]", actionType, nodeAddress+" "+node.Name)
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return nil, nil
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}
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