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Mutable --node-label values for server/agent sub-commands.

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Values passed in via the server/agent `--node-label` flag are treated as mutable. They are passed through to the kubelet just as before but after the kubelet comes up they are applied again. This allows for passing labels a k3s start-time that may be necessary for scheduling but may change from boot to boot, e.g. `k3os.io/version` after an upgrade.

Tested locallon on my amd64 workstation with the docker container.

Addresses #1119.
This commit is contained in:
Jacob Blain Christen 2019-12-09 15:54:56 -07:00
parent 45aa518ba8
commit 063efb25bb
2 changed files with 38 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

53
pkg/agent/run.go
View File

@ -9,6 +9,8 @@ import (
"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"
@ -72,10 +74,8 @@ func run(ctx context.Context, cfg cmds.Agent, lb *loadbalancer.LoadBalancer) err
}
}
if !nodeConfig.AgentConfig.DisableCCM {
if err := syncAddressesLabels(ctx, &nodeConfig.AgentConfig, coreClient.CoreV1().Nodes()); err != nil {
return err
}
if err := syncLabels(ctx, &nodeConfig.AgentConfig, coreClient.CoreV1().Nodes()); err != nil {
return err
}
if !nodeConfig.AgentConfig.DisableNPC {
@ -158,7 +158,7 @@ func validate() error {
return nil
}
func syncAddressesLabels(ctx context.Context, agentConfig *daemonconfig.Agent, nodes v1.NodeInterface) error {
func syncLabels(ctx context.Context, agentConfig *daemonconfig.Agent, nodes v1.NodeInterface) error {
for {
node, err := nodes.Get(agentConfig.NodeName, metav1.GetOptions{})
if err != nil {
@ -167,8 +167,14 @@ func syncAddressesLabels(ctx context.Context, agentConfig *daemonconfig.Agent, n
continue
}
newLabels, update := updateLabelMap(agentConfig, node.Labels)
if update {
newLabels, updateMutables := updateMutableLabels(agentConfig, node.Labels)
updateAddresses := !agentConfig.DisableCCM
if updateAddresses {
newLabels, updateAddresses = updateAddressLabels(agentConfig, newLabels)
}
if updateAddresses || updateMutables {
node.Labels = newLabels
if _, err := nodes.Update(node); err != nil {
logrus.Infof("Failed to update node %s: %v", agentConfig.NodeName, err)
@ -179,9 +185,9 @@ func syncAddressesLabels(ctx context.Context, agentConfig *daemonconfig.Agent, n
continue
}
}
logrus.Infof("addresses labels has been set successfully on node: %s", agentConfig.NodeName)
logrus.Infof("labels have been set successfully on node: %s", agentConfig.NodeName)
} else {
logrus.Infof("addresses labels has already been set successfully on node: %s", agentConfig.NodeName)
logrus.Infof("labels have already set on node: %s", agentConfig.NodeName)
}
break
@ -190,19 +196,34 @@ func syncAddressesLabels(ctx context.Context, agentConfig *daemonconfig.Agent, n
return nil
}
func updateLabelMap(agentConfig *daemonconfig.Agent, nodeLabels map[string]string) (map[string]string, bool) {
func updateMutableLabels(agentConfig *daemonconfig.Agent, nodeLabels map[string]string) (map[string]string, bool) {
result := map[string]string{}
for k, v := range nodeLabels {
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)
}
result[InternalIPLabel] = agentConfig.NodeIP
result[HostnameLabel] = agentConfig.NodeName
if agentConfig.NodeExternalIP == "" {
delete(result, ExternalIPLabel)
} else {
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)
}

2
pkg/cli/cmds/agent.go
View File

@ -123,7 +123,7 @@ var (
}
NodeLabels = cli.StringSliceFlag{
Name: "node-label",
Usage: "(agent/node) Registering kubelet with set of labels",
Usage: "(agent/node) Registering and starting kubelet with set of labels",
Value: &AgentConfig.Labels,
}
)