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controller_manager_boot.go
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controller_manager_boot.go
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package k8s
import (
"context"
"github.com/cybozu-go/cke"
"github.com/cybozu-go/cke/op"
"github.com/cybozu-go/cke/op/common"
"k8s.io/client-go/tools/clientcmd"
)
type controllerManagerBootOp struct {
nodes []*cke.Node
cluster string
serviceSubnet string
params cke.ServiceParams
step int
files *common.FilesBuilder
}
// ControllerManagerBootOp returns an Operator to bootstrap kube-controller-manager
func ControllerManagerBootOp(nodes []*cke.Node, cluster string, serviceSubnet string, params cke.ServiceParams) cke.Operator {
return &controllerManagerBootOp{
nodes: nodes,
cluster: cluster,
serviceSubnet: serviceSubnet,
params: params,
files: common.NewFilesBuilder(nodes),
}
}
func (o *controllerManagerBootOp) Name() string {
return "kube-controller-manager-bootstrap"
}
func (o *controllerManagerBootOp) NextCommand() cke.Commander {
switch o.step {
case 0:
o.step++
return common.ImagePullCommand(o.nodes, cke.HyperkubeImage)
case 1:
o.step++
return prepareControllerManagerFilesCommand{o.cluster, o.files}
case 2:
o.step++
return o.files
case 3:
o.step++
return common.RunContainerCommand(o.nodes,
op.KubeControllerManagerContainerName, cke.HyperkubeImage,
common.WithParams(ControllerManagerParams(o.cluster, o.serviceSubnet)),
common.WithExtra(o.params))
default:
return nil
}
}
type prepareControllerManagerFilesCommand struct {
cluster string
files *common.FilesBuilder
}
func (c prepareControllerManagerFilesCommand) Run(ctx context.Context, inf cke.Infrastructure) error {
const kubeconfigPath = "/etc/kubernetes/controller-manager/kubeconfig"
storage := inf.Storage()
ca, err := storage.GetCACertificate(ctx, "kubernetes")
if err != nil {
return err
}
g := func(ctx context.Context, n *cke.Node) ([]byte, error) {
crt, key, err := cke.KubernetesCA{}.IssueForControllerManager(ctx, inf)
if err != nil {
return nil, err
}
cfg := controllerManagerKubeconfig(c.cluster, ca, crt, key)
return clientcmd.Write(*cfg)
}
err = c.files.AddFile(ctx, kubeconfigPath, g)
if err != nil {
return err
}
saKey, err := storage.GetServiceAccountKey(ctx)
if err != nil {
return err
}
saKeyData := []byte(saKey)
g = func(ctx context.Context, n *cke.Node) ([]byte, error) {
return saKeyData, nil
}
return c.files.AddFile(ctx, op.K8sPKIPath("service-account.key"), g)
}
func (c prepareControllerManagerFilesCommand) Command() cke.Command {
return cke.Command{
Name: "prepare-controller-manager-files",
}
}
// ControllerManagerParams returns parameters for kube-controller-manager.
func ControllerManagerParams(clusterName, serviceSubnet string) cke.ServiceParams {
args := []string{
"controller-manager",
"--cluster-name=" + clusterName,
"--service-cluster-ip-range=" + serviceSubnet,
"--kubeconfig=/etc/kubernetes/controller-manager/kubeconfig",
// ToDo: cluster signing
// https://kubernetes.io/docs/tasks/tls/managing-tls-in-a-cluster/#a-note-to-cluster-administrators
// https://kubernetes.io/docs/reference/command-line-tools-reference/kubelet-tls-bootstrapping/
// Create an intermediate CA under cke/ca-kubernetes?
// or just an certificate/key pair?
// "--cluster-signing-cert-file=..."
// "--cluster-signing-key-file=..."
// for healthz service
"--tls-cert-file=" + op.K8sPKIPath("apiserver.crt"),
"--tls-private-key-file=" + op.K8sPKIPath("apiserver.key"),
// for service accounts
"--root-ca-file=" + op.K8sPKIPath("ca.crt"),
"--service-account-private-key-file=" + op.K8sPKIPath("service-account.key"),
"--use-service-account-credentials=true",
}
return cke.ServiceParams{
ExtraArguments: args,
ExtraBinds: []cke.Mount{
{
Source: "/etc/machine-id",
Destination: "/etc/machine-id",
ReadOnly: true,
Propagation: "",
Label: "",
},
{
Source: "/etc/kubernetes",
Destination: "/etc/kubernetes",
ReadOnly: true,
Propagation: "",
Label: cke.LabelShared,
},
},
}
}