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model.go
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model.go
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/*
Copyright 2018 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package etcdmanager
import (
"bytes"
"encoding/json"
"fmt"
"io"
"os"
"strings"
"github.com/golang/glog"
"k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/resource"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/util/yaml"
scheme "k8s.io/client-go/kubernetes/scheme"
"k8s.io/kops/pkg/apis/kops"
"k8s.io/kops/pkg/assets"
"k8s.io/kops/pkg/dns"
"k8s.io/kops/pkg/flagbuilder"
"k8s.io/kops/pkg/k8scodecs"
"k8s.io/kops/pkg/kubemanifest"
"k8s.io/kops/pkg/model"
"k8s.io/kops/upup/pkg/fi"
"k8s.io/kops/upup/pkg/fi/cloudup/awsup"
"k8s.io/kops/upup/pkg/fi/cloudup/gce"
"k8s.io/kops/upup/pkg/fi/fitasks"
"k8s.io/kops/util/pkg/exec"
)
const metaFilename = "_etcd_backup.meta"
// EtcdManagerBuilder builds the manifest for the etcd-manager
type EtcdManagerBuilder struct {
*model.KopsModelContext
Lifecycle *fi.Lifecycle
AssetBuilder *assets.AssetBuilder
}
var _ fi.ModelBuilder = &EtcdManagerBuilder{}
// Build creates the tasks
func (b *EtcdManagerBuilder) Build(c *fi.ModelBuilderContext) error {
for _, etcdCluster := range b.Cluster.Spec.EtcdClusters {
if etcdCluster.Provider != kops.EtcdProviderTypeManager {
continue
}
name := etcdCluster.Name
version := etcdCluster.Version
backupStore := ""
if etcdCluster.Backups != nil {
backupStore = etcdCluster.Backups.BackupStore
}
if backupStore == "" {
return fmt.Errorf("backupStore must be set for use with etcd-manager")
}
manifest, err := b.buildManifest(etcdCluster)
if err != nil {
return err
}
manifestYAML, err := k8scodecs.ToVersionedYaml(manifest)
if err != nil {
return fmt.Errorf("error marshalling manifest to yaml: %v", err)
}
c.AddTask(&fitasks.ManagedFile{
Contents: fi.WrapResource(fi.NewBytesResource(manifestYAML)),
Lifecycle: b.Lifecycle,
Location: fi.String("manifests/etcd/" + name + ".yaml"),
Name: fi.String("manifests-etcdmanager-" + name),
})
info := &etcdClusterSpec{
EtcdVersion: version,
MemberCount: int32(len(etcdCluster.Members)),
}
d, err := json.MarshalIndent(info, "", " ")
if err != nil {
return err
}
c.AddTask(&fitasks.ManagedFile{
Contents: fi.WrapResource(fi.NewBytesResource(d)),
Lifecycle: b.Lifecycle,
// TODO: We need this to match the backup base (currently)
Location: fi.String("backups/etcd/" + etcdCluster.Name + "/control/etcd-cluster-spec"),
Name: fi.String("etcd-cluster-spec-" + name),
})
}
return nil
}
type etcdClusterSpec struct {
MemberCount int32 `json:"member_count,omitempty"`
EtcdVersion string `json:"etcd_version,omitempty"`
}
func (b *EtcdManagerBuilder) buildManifest(etcdCluster *kops.EtcdClusterSpec) (*v1.Pod, error) {
return b.buildPod(etcdCluster)
}
// parseManifest parses a set of objects from a []byte
func parseManifest(data []byte) ([]runtime.Object, error) {
decoder := yaml.NewYAMLOrJSONDecoder(bytes.NewReader(data), 4096)
deser := scheme.Codecs.UniversalDeserializer()
var objects []runtime.Object
for {
ext := runtime.RawExtension{}
if err := decoder.Decode(&ext); err != nil {
if err == io.EOF {
break
}
fmt.Fprintf(os.Stderr, "%s", string(data))
glog.Infof("manifest: %s", string(data))
return nil, fmt.Errorf("error parsing manifest: %v", err)
}
obj, _, err := deser.Decode([]byte(ext.Raw), nil, nil)
if err != nil {
return nil, fmt.Errorf("error parsing object in manifest: %v", err)
}
objects = append(objects, obj)
}
return objects, nil
}
// Until we introduce the bundle, we hard-code the manifest
var defaultManifest = `
apiVersion: v1
kind: Pod
metadata:
name: etcd-manager
namespace: kube-system
spec:
containers:
- image: kopeio/etcd-manager:1.0.20181001
name: etcd-manager
resources:
requests:
cpu: 100m
# TODO: Would be nice to reduce these permissions; needed for volume mounting
securityContext:
privileged: true
volumeMounts:
# TODO: Would be nice to scope this more tightly, but needed for volume mounting
- mountPath: /rootfs
name: rootfs
# We write artificial hostnames into etc hosts for the etcd nodes, so they have stable names
- mountPath: /etc/hosts
name: hosts
hostNetwork: true
hostPID: true # helps with mounting volumes from inside a container
volumes:
- hostPath:
path: /
type: Directory
name: rootfs
- hostPath:
path: /etc/hosts
type: File
name: hosts
`
// buildPod creates the pod spec, based on the EtcdClusterSpec
func (b *EtcdManagerBuilder) buildPod(etcdCluster *kops.EtcdClusterSpec) (*v1.Pod, error) {
var pod *v1.Pod
var container *v1.Container
var manifest []byte
// TODO: pull from bundle
bundle := "(embedded etcd manifest)"
manifest = []byte(defaultManifest)
{
objects, err := parseManifest(manifest)
if err != nil {
return nil, err
}
if len(objects) != 1 {
return nil, fmt.Errorf("expected exactly one object in manifest %s, found %d", bundle, len(objects))
}
if podObject, ok := objects[0].(*v1.Pod); !ok {
return nil, fmt.Errorf("expected v1.Pod object in manifest %s, found %T", bundle, objects[0])
} else {
pod = podObject
}
if len(pod.Spec.Containers) != 1 {
return nil, fmt.Errorf("expected exactly one container in etcd-manager Pod, found %d", len(pod.Spec.Containers))
}
container = &pod.Spec.Containers[0]
if etcdCluster.Manager != nil && etcdCluster.Manager.Image != "" {
glog.Warningf("overloading image in manifest %s with images %s", bundle, etcdCluster.Manager.Image)
container.Image = etcdCluster.Manager.Image
}
}
// Remap image via AssetBuilder
{
remapped, err := b.AssetBuilder.RemapImage(container.Image)
if err != nil {
return nil, fmt.Errorf("unable to remap container image %q: %v", container.Image, err)
}
container.Image = remapped
}
isTLS := etcdCluster.EnableEtcdTLS
cpuRequest := resource.MustParse("100m")
clientPort := 4001
clusterName := "etcd-" + etcdCluster.Name
peerPort := 2380
backupStore := ""
if etcdCluster.Backups != nil {
backupStore = etcdCluster.Backups.BackupStore
}
pod.Name = "etcd-manager-" + etcdCluster.Name
if pod.Labels == nil {
pod.Labels = make(map[string]string)
}
pod.Labels["k8s-app"] = pod.Name
// TODO: Use a socket file for the quarantine port
quarantinedClientPort := 3994
grpcPort := 3996
// The dns suffix logic mirrors the existing logic, so we should be compatible with existing clusters
// (etcd makes it difficult to change peer urls, treating it as a cluster event, for reasons unknown)
dnsInternalSuffix := ""
if dns.IsGossipHostname(b.Cluster.Spec.MasterInternalName) {
// @TODO: This is hacky, but we want it so that we can have a different internal & external name
dnsInternalSuffix = b.Cluster.Spec.MasterInternalName
dnsInternalSuffix = strings.TrimPrefix(dnsInternalSuffix, "api.")
}
if dnsInternalSuffix == "" {
dnsInternalSuffix = ".internal." + b.Cluster.ObjectMeta.Name
}
switch etcdCluster.Name {
case "main":
clusterName = "etcd"
cpuRequest = resource.MustParse("200m")
case "events":
clientPort = 4002
peerPort = 2381
grpcPort = 3997
quarantinedClientPort = 3995
default:
return nil, fmt.Errorf("unknown etcd cluster key %q", etcdCluster.Name)
}
if backupStore == "" {
return nil, fmt.Errorf("backupStore must be set for use with etcd-manager")
}
name := clusterName
if !strings.HasPrefix(name, "etcd") {
// For sanity, and to avoid collisions in directories / dns
return nil, fmt.Errorf("unexpected name for etcd cluster (must start with etcd): %q", name)
}
logFile := "/var/log/" + name + ".log"
config := &config{
Containerized: true,
ClusterName: clusterName,
BackupStore: backupStore,
GrpcPort: grpcPort,
DNSSuffix: dnsInternalSuffix,
}
config.LogVerbosity = 8
{
// @check if we are using TLS
scheme := "http"
if isTLS {
scheme = "https"
}
config.PeerUrls = fmt.Sprintf("%s://__name__:%d", scheme, peerPort)
config.ClientUrls = fmt.Sprintf("%s://__name__:%d", scheme, clientPort)
config.QuarantineClientUrls = fmt.Sprintf("%s://__name__:%d", scheme, quarantinedClientPort)
// TODO: We need to wire these into the etcd-manager spec
// // add timeout/heartbeat settings
if etcdCluster.LeaderElectionTimeout != nil {
// envs = append(envs, v1.EnvVar{Name: "ETCD_ELECTION_TIMEOUT", Value: convEtcdSettingsToMs(etcdClusterSpec.LeaderElectionTimeout)})
return nil, fmt.Errorf("LeaderElectionTimeout not supported by etcd-manager")
}
if etcdCluster.HeartbeatInterval != nil {
// envs = append(envs, v1.EnvVar{Name: "ETCD_HEARTBEAT_INTERVAL", Value: convEtcdSettingsToMs(etcdClusterSpec.HeartbeatInterval)})
return nil, fmt.Errorf("HeartbeatInterval not supported by etcd-manager")
}
if isTLS {
return nil, fmt.Errorf("TLS not supported for etcd-manager")
}
}
{
switch kops.CloudProviderID(b.Cluster.Spec.CloudProvider) {
case kops.CloudProviderAWS:
config.VolumeProvider = "aws"
config.VolumeTag = []string{
fmt.Sprintf("kubernetes.io/cluster/%s=owned", b.Cluster.Name),
awsup.TagNameEtcdClusterPrefix + etcdCluster.Name,
awsup.TagNameRolePrefix + "master=1",
}
config.VolumeNameTag = awsup.TagNameEtcdClusterPrefix + etcdCluster.Name
case kops.CloudProviderGCE:
config.VolumeProvider = "gce"
config.VolumeTag = []string{
gce.GceLabelNameKubernetesCluster + "=" + gce.SafeClusterName(b.Cluster.Name),
gce.GceLabelNameEtcdClusterPrefix + etcdCluster.Name,
gce.GceLabelNameRolePrefix + "master=master",
}
config.VolumeNameTag = gce.GceLabelNameEtcdClusterPrefix + etcdCluster.Name
default:
return nil, fmt.Errorf("CloudProvider %q not supported with etcd-manager", b.Cluster.Spec.CloudProvider)
}
}
args, err := flagbuilder.BuildFlagsList(config)
if err != nil {
return nil, err
}
{
container.Command = exec.WithTee("/etcd-manager", args, "/var/log/etcd.log")
// TODO: Should we try to incorporate the resources in the manifest?
container.Resources = v1.ResourceRequirements{
Requests: v1.ResourceList{
v1.ResourceCPU: cpuRequest,
},
}
// TODO: Use helper function here
container.VolumeMounts = append(container.VolumeMounts, v1.VolumeMount{
Name: "varlogetcd",
MountPath: "/var/log/etcd.log",
ReadOnly: false,
})
hostPathFileOrCreate := v1.HostPathFileOrCreate
pod.Spec.Volumes = append(pod.Spec.Volumes, v1.Volume{
Name: "varlogetcd",
VolumeSource: v1.VolumeSource{
HostPath: &v1.HostPathVolumeSource{
Path: logFile,
Type: &hostPathFileOrCreate,
},
},
})
if isTLS {
return nil, fmt.Errorf("TLS not supported for etcd-manager")
}
}
kubemanifest.MarkPodAsCritical(pod)
return pod, nil
}
// config defines the flags for etcd-manager
type config struct {
// LogVerbosity sets the log verbosity level
LogVerbosity int `flag:"v"`
// Containerized is set if etcd-manager is running in a container
Containerized bool `flag:"containerized"`
Address string `flag:"address"`
PeerUrls string `flag:"peer-urls"`
GrpcPort int `flag:"grpc-port"`
ClientUrls string `flag:"client-urls"`
QuarantineClientUrls string `flag:"quarantine-client-urls"`
ClusterName string `flag:"cluster-name"`
BackupStore string `flag:"backup-store"`
DataDir string `flag:"data-dir"`
VolumeProvider string `flag:"volume-provider"`
VolumeTag []string `flag:"volume-tag,repeat"`
VolumeNameTag string `flag:"volume-name-tag"`
DNSSuffix string `flag:"dns-suffix"`
}