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rkt.go
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rkt.go
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/*
Copyright 2015 The Kubernetes Authors All rights reserved.
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 rkt
import (
"bytes"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"os"
"os/exec"
"path"
"strconv"
"strings"
"syscall"
"time"
appcschema "github.com/appc/spec/schema"
appctypes "github.com/appc/spec/schema/types"
"github.com/coreos/go-systemd/unit"
rktapi "github.com/coreos/rkt/api/v1alpha"
"github.com/golang/glog"
"golang.org/x/net/context"
"google.golang.org/grpc"
"k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/client/record"
"k8s.io/kubernetes/pkg/credentialprovider"
kubecontainer "k8s.io/kubernetes/pkg/kubelet/container"
proberesults "k8s.io/kubernetes/pkg/kubelet/prober/results"
"k8s.io/kubernetes/pkg/kubelet/util/format"
"k8s.io/kubernetes/pkg/securitycontext"
"k8s.io/kubernetes/pkg/types"
"k8s.io/kubernetes/pkg/util"
utilexec "k8s.io/kubernetes/pkg/util/exec"
"k8s.io/kubernetes/pkg/util/sets"
utilstrings "k8s.io/kubernetes/pkg/util/strings"
)
const (
RktType = "rkt"
minimumAppcVersion = "0.7.4"
minimumRktBinVersion = "0.13.0"
recommendedRktBinVersion = "0.13.0"
minimumRktApiVersion = "1.0.0-alpha"
minimumSystemdVersion = "219"
systemdServiceDir = "/run/systemd/system"
rktDataDir = "/var/lib/rkt"
rktLocalConfigDir = "/etc/rkt"
kubernetesUnitPrefix = "k8s"
unitKubernetesSection = "X-Kubernetes"
unitPodName = "POD"
unitRktID = "RktID"
unitRestartCount = "RestartCount"
k8sRktKubeletAnno = "rkt.kubernetes.io/managed-by-kubelet"
k8sRktKubeletAnnoValue = "true"
k8sRktUIDAnno = "rkt.kubernetes.io/uid"
k8sRktNameAnno = "rkt.kubernetes.io/name"
k8sRktNamespaceAnno = "rkt.kubernetes.io/namespace"
//TODO: remove the creation time annotation once this is closed: https://github.com/coreos/rkt/issues/1789
k8sRktCreationTimeAnno = "rkt.kubernetes.io/created"
k8sRktContainerHashAnno = "rkt.kubernetes.io/container-hash"
k8sRktRestartCountAnno = "rkt.kubernetes.io/restart-count"
k8sRktTerminationMessagePathAnno = "rkt.kubernetes.io/termination-message-path"
dockerPrefix = "docker://"
authDir = "auth.d"
dockerAuthTemplate = `{"rktKind":"dockerAuth","rktVersion":"v1","registries":[%q],"credentials":{"user":%q,"password":%q}}`
defaultImageTag = "latest"
defaultRktAPIServiceAddr = "localhost:15441"
defaultNetworkName = "rkt.kubernetes.io"
// ndots specifies the minimum number of dots that a domain name must contain for the resolver to consider it as FQDN (fully-qualified)
// we want to able to consider SRV lookup names like _dns._udp.kube-dns.default.svc to be considered relative.
// hence, setting ndots to be 5.
// TODO(yifan): Move this and dockertools.ndotsDNSOption to a common package.
defaultDNSOption = "ndots:5"
)
// Runtime implements the Containerruntime for rkt. The implementation
// uses systemd, so in order to run this runtime, systemd must be installed
// on the machine.
type Runtime struct {
systemd systemdInterface
// The grpc client for rkt api-service.
apisvcConn *grpc.ClientConn
apisvc rktapi.PublicAPIClient
// The absolute path to rkt binary.
rktBinAbsPath string
config *Config
// TODO(yifan): Refactor this to be generic keyring.
dockerKeyring credentialprovider.DockerKeyring
containerRefManager *kubecontainer.RefManager
runtimeHelper kubecontainer.RuntimeHelper
recorder record.EventRecorder
livenessManager proberesults.Manager
volumeGetter volumeGetter
imagePuller kubecontainer.ImagePuller
// Versions
binVersion rktVersion
apiVersion rktVersion
appcVersion rktVersion
systemdVersion systemdVersion
}
var _ kubecontainer.Runtime = &Runtime{}
// TODO(yifan): Remove this when volumeManager is moved to separate package.
type volumeGetter interface {
GetVolumes(podUID types.UID) (kubecontainer.VolumeMap, bool)
}
// New creates the rkt container runtime which implements the container runtime interface.
// It will test if the rkt binary is in the $PATH, and whether we can get the
// version of it. If so, creates the rkt container runtime, otherwise returns an error.
func New(config *Config,
runtimeHelper kubecontainer.RuntimeHelper,
recorder record.EventRecorder,
containerRefManager *kubecontainer.RefManager,
livenessManager proberesults.Manager,
volumeGetter volumeGetter,
imageBackOff *util.Backoff,
serializeImagePulls bool,
) (*Runtime, error) {
// Create dbus connection.
systemd, err := newSystemd()
if err != nil {
return nil, fmt.Errorf("rkt: cannot create systemd interface: %v", err)
}
// TODO(yifan): Use secure connection.
apisvcConn, err := grpc.Dial(defaultRktAPIServiceAddr, grpc.WithInsecure())
if err != nil {
return nil, fmt.Errorf("rkt: cannot connect to rkt api service: %v", err)
}
rktBinAbsPath := config.Path
if rktBinAbsPath == "" {
// No default rkt path was set, so try to find one in $PATH.
var err error
rktBinAbsPath, err = exec.LookPath("rkt")
if err != nil {
return nil, fmt.Errorf("cannot find rkt binary: %v", err)
}
}
rkt := &Runtime{
systemd: systemd,
rktBinAbsPath: rktBinAbsPath,
apisvcConn: apisvcConn,
apisvc: rktapi.NewPublicAPIClient(apisvcConn),
config: config,
dockerKeyring: credentialprovider.NewDockerKeyring(),
containerRefManager: containerRefManager,
runtimeHelper: runtimeHelper,
recorder: recorder,
livenessManager: livenessManager,
volumeGetter: volumeGetter,
}
if serializeImagePulls {
rkt.imagePuller = kubecontainer.NewSerializedImagePuller(recorder, rkt, imageBackOff)
} else {
rkt.imagePuller = kubecontainer.NewImagePuller(recorder, rkt, imageBackOff)
}
return rkt, nil
}
func (r *Runtime) buildCommand(args ...string) *exec.Cmd {
cmd := exec.Command(r.rktBinAbsPath)
cmd.Args = append(cmd.Args, r.config.buildGlobalOptions()...)
cmd.Args = append(cmd.Args, args...)
return cmd
}
// convertToACName converts a string into ACName.
func convertToACName(name string) appctypes.ACName {
// Note that as the 'name' already matches 'DNS_LABEL'
// defined in pkg/api/types.go, there shouldn't be error or panic.
acname, _ := appctypes.SanitizeACName(name)
return *appctypes.MustACName(acname)
}
// runCommand invokes rkt binary with arguments and returns the result
// from stdout in a list of strings. Each string in the list is a line.
func (r *Runtime) runCommand(args ...string) ([]string, error) {
glog.V(4).Info("rkt: Run command:", args)
var stdout, stderr bytes.Buffer
cmd := r.buildCommand(args...)
cmd.Stdout, cmd.Stderr = &stdout, &stderr
if err := cmd.Run(); err != nil {
return nil, fmt.Errorf("failed to run %v: %v\nstdout: %v\nstderr: %v", args, err, stdout.String(), stderr.String())
}
return strings.Split(strings.TrimSpace(stdout.String()), "\n"), nil
}
// makePodServiceFileName constructs the unit file name for a pod using its UID.
func makePodServiceFileName(uid types.UID) string {
// TODO(yifan): Add name for readability? We need to consider the
// limit of the length.
return fmt.Sprintf("%s_%s.service", kubernetesUnitPrefix, uid)
}
// setIsolators sets the apps' isolators according to the security context and resource spec.
func setIsolators(app *appctypes.App, c *api.Container, ctx *api.SecurityContext) error {
var isolators []appctypes.Isolator
// Capabilities isolators.
if ctx != nil {
var addCaps, dropCaps []string
if ctx.Capabilities != nil {
addCaps, dropCaps = securitycontext.MakeCapabilities(ctx.Capabilities.Add, ctx.Capabilities.Drop)
}
if ctx.Privileged != nil && *ctx.Privileged {
addCaps, dropCaps = allCapabilities(), []string{}
}
if len(addCaps) > 0 {
set, err := appctypes.NewLinuxCapabilitiesRetainSet(addCaps...)
if err != nil {
return err
}
isolators = append(isolators, set.AsIsolator())
}
if len(dropCaps) > 0 {
set, err := appctypes.NewLinuxCapabilitiesRevokeSet(dropCaps...)
if err != nil {
return err
}
isolators = append(isolators, set.AsIsolator())
}
}
// Resources isolators.
type resource struct {
limit string
request string
}
// If limit is empty, populate it with request and vice versa.
resources := make(map[api.ResourceName]*resource)
for name, quantity := range c.Resources.Limits {
resources[name] = &resource{limit: quantity.String(), request: quantity.String()}
}
for name, quantity := range c.Resources.Requests {
r, ok := resources[name]
if ok {
r.request = quantity.String()
continue
}
resources[name] = &resource{limit: quantity.String(), request: quantity.String()}
}
for name, res := range resources {
switch name {
case api.ResourceCPU:
cpu, err := appctypes.NewResourceCPUIsolator(res.request, res.limit)
if err != nil {
return err
}
isolators = append(isolators, cpu.AsIsolator())
case api.ResourceMemory:
memory, err := appctypes.NewResourceMemoryIsolator(res.request, res.limit)
if err != nil {
return err
}
isolators = append(isolators, memory.AsIsolator())
default:
return fmt.Errorf("resource type not supported: %v", name)
}
}
mergeIsolators(app, isolators)
return nil
}
// mergeIsolators replaces the app.Isolators with isolators.
func mergeIsolators(app *appctypes.App, isolators []appctypes.Isolator) {
for _, is := range isolators {
found := false
for j, js := range app.Isolators {
if is.Name.Equals(js.Name) {
switch is.Name {
case appctypes.LinuxCapabilitiesRetainSetName:
// TODO(yifan): More fine grain merge for capability set instead of override.
fallthrough
case appctypes.LinuxCapabilitiesRevokeSetName:
fallthrough
case appctypes.ResourceCPUName:
fallthrough
case appctypes.ResourceMemoryName:
app.Isolators[j] = is
default:
panic(fmt.Sprintf("unexpected isolator name: %v", is.Name))
}
found = true
break
}
}
if !found {
app.Isolators = append(app.Isolators, is)
}
}
}
// mergeEnv merges the optEnv with the image's environments.
// The environments defined in the image will be overridden by
// the ones with the same name in optEnv.
func mergeEnv(app *appctypes.App, optEnv []kubecontainer.EnvVar) {
envMap := make(map[string]string)
for _, e := range app.Environment {
envMap[e.Name] = e.Value
}
for _, e := range optEnv {
envMap[e.Name] = e.Value
}
app.Environment = nil
for name, value := range envMap {
app.Environment = append(app.Environment, appctypes.EnvironmentVariable{
Name: name,
Value: value,
})
}
}
// mergeMounts merges the optMounts with the image's mount points.
// The mount points defined in the image will be overridden by the ones
// with the same name in optMounts.
func mergeMounts(app *appctypes.App, optMounts []kubecontainer.Mount) {
mountMap := make(map[appctypes.ACName]appctypes.MountPoint)
for _, m := range app.MountPoints {
mountMap[m.Name] = m
}
for _, m := range optMounts {
mpName := convertToACName(m.Name)
mountMap[mpName] = appctypes.MountPoint{
Name: mpName,
Path: m.ContainerPath,
ReadOnly: m.ReadOnly,
}
}
app.MountPoints = nil
for _, mount := range mountMap {
app.MountPoints = append(app.MountPoints, mount)
}
}
// mergePortMappings merges the optPortMappings with the image's port mappings.
// The port mappings defined in the image will be overridden by the ones
// with the same name in optPortMappings.
func mergePortMappings(app *appctypes.App, optPortMappings []kubecontainer.PortMapping) {
portMap := make(map[appctypes.ACName]appctypes.Port)
for _, p := range app.Ports {
portMap[p.Name] = p
}
for _, p := range optPortMappings {
pName := convertToACName(p.Name)
portMap[pName] = appctypes.Port{
Name: pName,
Protocol: string(p.Protocol),
Port: uint(p.ContainerPort),
}
}
app.Ports = nil
for _, port := range portMap {
app.Ports = append(app.Ports, port)
}
}
func verifyNonRoot(app *appctypes.App, ctx *api.SecurityContext) error {
if ctx != nil && ctx.RunAsNonRoot != nil && *ctx.RunAsNonRoot {
if ctx.RunAsUser != nil && *ctx.RunAsUser == 0 {
return fmt.Errorf("container's runAsUser breaks non-root policy")
}
if ctx.RunAsUser == nil && app.User == "0" {
return fmt.Errorf("container has no runAsUser and image will run as root")
}
}
return nil
}
func setSupplementaryGIDs(app *appctypes.App, podCtx *api.PodSecurityContext) {
if podCtx != nil {
app.SupplementaryGIDs = app.SupplementaryGIDs[:0]
for _, v := range podCtx.SupplementalGroups {
app.SupplementaryGIDs = append(app.SupplementaryGIDs, int(v))
}
if podCtx.FSGroup != nil {
app.SupplementaryGIDs = append(app.SupplementaryGIDs, int(*podCtx.FSGroup))
}
}
}
// setApp merges the container spec with the image's manifest.
func setApp(app *appctypes.App, c *api.Container, opts *kubecontainer.RunContainerOptions, ctx *api.SecurityContext, podCtx *api.PodSecurityContext) error {
// TODO(yifan): If ENTRYPOINT and CMD are both specified in the image,
// we cannot override just one of these at this point as they are already mixed.
command, args := kubecontainer.ExpandContainerCommandAndArgs(c, opts.Envs)
exec := append(command, args...)
if len(exec) > 0 {
app.Exec = exec
}
// Set UID and GIDs.
if err := verifyNonRoot(app, ctx); err != nil {
return err
}
if ctx != nil && ctx.RunAsUser != nil {
app.User = strconv.Itoa(int(*ctx.RunAsUser))
}
setSupplementaryGIDs(app, podCtx)
// If 'User' or 'Group' are still empty at this point,
// then apply the root UID and GID.
// TODO(yifan): Instead of using root GID, we should use
// the GID which the user is in.
if app.User == "" {
app.User = "0"
}
if app.Group == "" {
app.Group = "0"
}
// Set working directory.
if len(c.WorkingDir) > 0 {
app.WorkingDirectory = c.WorkingDir
}
// Notes that we don't create Mounts section in the pod manifest here,
// as Mounts will be automatically generated by rkt.
mergeMounts(app, opts.Mounts)
mergeEnv(app, opts.Envs)
mergePortMappings(app, opts.PortMappings)
return setIsolators(app, c, ctx)
}
// makePodManifest transforms a kubelet pod spec to the rkt pod manifest.
func (r *Runtime) makePodManifest(pod *api.Pod, pullSecrets []api.Secret) (*appcschema.PodManifest, error) {
manifest := appcschema.BlankPodManifest()
listResp, err := r.apisvc.ListPods(context.Background(), &rktapi.ListPodsRequest{
Detail: true,
Filters: kubernetesPodFilters(pod.UID),
})
if err != nil {
return nil, fmt.Errorf("couldn't list pods: %v", err)
}
restartCount := 0
for _, pod := range listResp.Pods {
manifest := &appcschema.PodManifest{}
err = json.Unmarshal(pod.Manifest, manifest)
if err != nil {
glog.Warningf("rkt: error unmatshaling pod manifest: %v", err)
continue
}
if countString, ok := manifest.Annotations.Get(k8sRktRestartCountAnno); ok {
num, err := strconv.Atoi(countString)
if err != nil {
glog.Warningf("rkt: error reading restart count on pod: %v", err)
continue
}
if num+1 > restartCount {
restartCount = num + 1
}
}
}
manifest.Annotations.Set(*appctypes.MustACIdentifier(k8sRktKubeletAnno), k8sRktKubeletAnnoValue)
manifest.Annotations.Set(*appctypes.MustACIdentifier(k8sRktUIDAnno), string(pod.UID))
manifest.Annotations.Set(*appctypes.MustACIdentifier(k8sRktNameAnno), pod.Name)
manifest.Annotations.Set(*appctypes.MustACIdentifier(k8sRktNamespaceAnno), pod.Namespace)
manifest.Annotations.Set(*appctypes.MustACIdentifier(k8sRktCreationTimeAnno), strconv.FormatInt(time.Now().Unix(), 10))
manifest.Annotations.Set(*appctypes.MustACIdentifier(k8sRktRestartCountAnno), strconv.Itoa(restartCount))
for _, c := range pod.Spec.Containers {
err := r.newAppcRuntimeApp(pod, c, pullSecrets, manifest)
if err != nil {
return nil, err
}
}
volumeMap, ok := r.volumeGetter.GetVolumes(pod.UID)
if !ok {
return nil, fmt.Errorf("cannot get the volumes for pod %q", format.Pod(pod))
}
// Set global volumes.
for vname, volume := range volumeMap {
manifest.Volumes = append(manifest.Volumes, appctypes.Volume{
Name: convertToACName(vname),
Kind: "host",
Source: volume.Builder.GetPath(),
})
}
// TODO(yifan): Set pod-level isolators once it's supported in kubernetes.
return manifest, nil
}
func makeContainerLogMount(opts *kubecontainer.RunContainerOptions, container *api.Container) (*kubecontainer.Mount, error) {
if opts.PodContainerDir == "" || container.TerminationMessagePath == "" {
return nil, nil
}
// In docker runtime, the container log path contains the container ID.
// However, for rkt runtime, we cannot get the container ID before the
// the container is launched, so here we generate a random uuid to enable
// us to map a container's termination message path to an unique log file
// on the disk.
randomUID := util.NewUUID()
containerLogPath := path.Join(opts.PodContainerDir, string(randomUID))
fs, err := os.Create(containerLogPath)
if err != nil {
return nil, err
}
if err := fs.Close(); err != nil {
return nil, err
}
mnt := &kubecontainer.Mount{
// Use a random name for the termination message mount, so that
// when a container restarts, it will not overwrite the old termination
// message.
Name: fmt.Sprintf("termination-message-%s", randomUID),
ContainerPath: container.TerminationMessagePath,
HostPath: containerLogPath,
ReadOnly: false,
}
opts.Mounts = append(opts.Mounts, *mnt)
return mnt, nil
}
func (r *Runtime) newAppcRuntimeApp(pod *api.Pod, c api.Container, pullSecrets []api.Secret, manifest *appcschema.PodManifest) error {
if err, _ := r.imagePuller.PullImage(pod, &c, pullSecrets); err != nil {
return nil
}
imgManifest, err := r.getImageManifest(c.Image)
if err != nil {
return err
}
if imgManifest.App == nil {
imgManifest.App = new(appctypes.App)
}
imageID, err := r.getImageID(c.Image)
if err != nil {
return err
}
hash, err := appctypes.NewHash(imageID)
if err != nil {
return err
}
// TODO: determine how this should be handled for rkt
opts, err := r.runtimeHelper.GenerateRunContainerOptions(pod, &c, "")
if err != nil {
return err
}
// create the container log file and make a mount pair.
mnt, err := makeContainerLogMount(opts, &c)
if err != nil {
return err
}
ctx := securitycontext.DetermineEffectiveSecurityContext(pod, &c)
if err := setApp(imgManifest.App, &c, opts, ctx, pod.Spec.SecurityContext); err != nil {
return err
}
ra := appcschema.RuntimeApp{
Name: convertToACName(c.Name),
Image: appcschema.RuntimeImage{ID: *hash},
App: imgManifest.App,
Annotations: []appctypes.Annotation{
{
Name: *appctypes.MustACIdentifier(k8sRktContainerHashAnno),
Value: strconv.FormatUint(kubecontainer.HashContainer(&c), 10),
},
},
}
if mnt != nil {
ra.Annotations = append(ra.Annotations, appctypes.Annotation{
Name: *appctypes.MustACIdentifier(k8sRktTerminationMessagePathAnno),
Value: mnt.HostPath,
})
manifest.Volumes = append(manifest.Volumes, appctypes.Volume{
Name: convertToACName(mnt.Name),
Kind: "host",
Source: mnt.HostPath,
})
}
manifest.Apps = append(manifest.Apps, ra)
// Set global ports.
for _, port := range opts.PortMappings {
manifest.Ports = append(manifest.Ports, appctypes.ExposedPort{
Name: convertToACName(port.Name),
HostPort: uint(port.HostPort),
})
}
return nil
}
func runningKubernetesPodFilters(uid types.UID) []*rktapi.PodFilter {
return []*rktapi.PodFilter{
{
States: []rktapi.PodState{
rktapi.PodState_POD_STATE_RUNNING,
},
Annotations: []*rktapi.KeyValue{
{
Key: k8sRktKubeletAnno,
Value: k8sRktKubeletAnnoValue,
},
{
Key: k8sRktUIDAnno,
Value: string(uid),
},
},
},
}
}
func kubernetesPodFilters(uid types.UID) []*rktapi.PodFilter {
return []*rktapi.PodFilter{
{
Annotations: []*rktapi.KeyValue{
{
Key: k8sRktKubeletAnno,
Value: k8sRktKubeletAnnoValue,
},
{
Key: k8sRktUIDAnno,
Value: string(uid),
},
},
},
}
}
func newUnitOption(section, name, value string) *unit.UnitOption {
return &unit.UnitOption{Section: section, Name: name, Value: value}
}
// apiPodToruntimePod converts an api.Pod to kubelet/container.Pod.
func apiPodToruntimePod(uuid string, pod *api.Pod) *kubecontainer.Pod {
p := &kubecontainer.Pod{
ID: pod.UID,
Name: pod.Name,
Namespace: pod.Namespace,
}
for i := range pod.Spec.Containers {
c := &pod.Spec.Containers[i]
p.Containers = append(p.Containers, &kubecontainer.Container{
ID: buildContainerID(&containerID{uuid, c.Name}),
Name: c.Name,
Image: c.Image,
Hash: kubecontainer.HashContainer(c),
Created: time.Now().Unix(),
})
}
return p
}
// serviceFilePath returns the absolute path of the service file.
func serviceFilePath(serviceName string) string {
return path.Join(systemdServiceDir, serviceName)
}
// generateRunCommand crafts a 'rkt run-prepared' command with necessary parameters.
func (r *Runtime) generateRunCommand(pod *api.Pod, uuid string) (string, error) {
runPrepared := r.buildCommand("run-prepared").Args
// Setup network configuration.
if pod.Spec.SecurityContext != nil && pod.Spec.SecurityContext.HostNetwork {
runPrepared = append(runPrepared, "--net=host")
} else {
runPrepared = append(runPrepared, fmt.Sprintf("--net=%s", defaultNetworkName))
}
// Setup DNS.
dnsServers, dnsSearches, err := r.runtimeHelper.GetClusterDNS(pod)
if err != nil {
return "", err
}
for _, server := range dnsServers {
runPrepared = append(runPrepared, fmt.Sprintf("--dns=%s", server))
}
for _, search := range dnsSearches {
runPrepared = append(runPrepared, fmt.Sprintf("--dns-search=%s", search))
}
if len(dnsServers) > 0 || len(dnsSearches) > 0 {
runPrepared = append(runPrepared, fmt.Sprintf("--dns-opt=%s", defaultDNSOption))
}
runPrepared = append(runPrepared, uuid)
return strings.Join(runPrepared, " "), nil
}
// preparePod will:
//
// 1. Invoke 'rkt prepare' to prepare the pod, and get the rkt pod uuid.
// 2. Create the unit file and save it under systemdUnitDir.
//
// On success, it will return a string that represents name of the unit file
// and the runtime pod.
func (r *Runtime) preparePod(pod *api.Pod, pullSecrets []api.Secret) (string, *kubecontainer.Pod, error) {
// Generate the pod manifest from the pod spec.
manifest, err := r.makePodManifest(pod, pullSecrets)
if err != nil {
return "", nil, err
}
manifestFile, err := ioutil.TempFile("", fmt.Sprintf("manifest-%s-", pod.Name))
if err != nil {
return "", nil, err
}
defer func() {
manifestFile.Close()
if err := os.Remove(manifestFile.Name()); err != nil {
glog.Warningf("rkt: Cannot remove temp manifest file %q: %v", manifestFile.Name(), err)
}
}()
data, err := json.Marshal(manifest)
if err != nil {
return "", nil, err
}
glog.V(4).Infof("Generating pod manifest for pod %q: %v", format.Pod(pod), string(data))
// Since File.Write returns error if the written length is less than len(data),
// so check error is enough for us.
if _, err := manifestFile.Write(data); err != nil {
return "", nil, err
}
// Run 'rkt prepare' to get the rkt UUID.
cmds := []string{"prepare", "--quiet", "--pod-manifest", manifestFile.Name()}
if r.config.Stage1Image != "" {
cmds = append(cmds, "--stage1-image", r.config.Stage1Image)
}
output, err := r.runCommand(cmds...)
if err != nil {
return "", nil, err
}
if len(output) != 1 {
return "", nil, fmt.Errorf("invalid output from 'rkt prepare': %v", output)
}
uuid := output[0]
glog.V(4).Infof("'rkt prepare' returns %q", uuid)
// Create systemd service file for the rkt pod.
runPrepared, err := r.generateRunCommand(pod, uuid)
if err != nil {
return "", nil, fmt.Errorf("failed to generate 'rkt run-prepared' command: %v", err)
}
// TODO handle pod.Spec.HostPID
// TODO handle pod.Spec.HostIPC
units := []*unit.UnitOption{
// This makes the service show up for 'systemctl list-units' even if it exits successfully.
newUnitOption("Service", "RemainAfterExit", "true"),
newUnitOption("Service", "ExecStart", runPrepared),
// This enables graceful stop.
newUnitOption("Service", "KillMode", "mixed"),
}
// Check if there's old rkt pod corresponding to the same pod, if so, update the restart count.
var needReload bool
serviceName := makePodServiceFileName(pod.UID)
if _, err := os.Stat(serviceFilePath(serviceName)); err == nil {
// Service file already exists, that means the pod is being restarted.
needReload = true
}
glog.V(4).Infof("rkt: Creating service file %q for pod %q", serviceName, format.Pod(pod))
serviceFile, err := os.Create(serviceFilePath(serviceName))
if err != nil {
return "", nil, err
}
if _, err := io.Copy(serviceFile, unit.Serialize(units)); err != nil {
return "", nil, err
}
serviceFile.Close()
if needReload {
if err := r.systemd.Reload(); err != nil {
return "", nil, err
}
}
return serviceName, apiPodToruntimePod(uuid, pod), nil
}
// generateEvents is a helper function that generates some container
// life cycle events for containers in a pod.
func (r *Runtime) generateEvents(runtimePod *kubecontainer.Pod, reason string, failure error) {
// Set up container references.
for _, c := range runtimePod.Containers {
containerID := c.ID
id, err := parseContainerID(containerID)
if err != nil {
glog.Warningf("Invalid container ID %q", containerID)
continue
}
ref, ok := r.containerRefManager.GetRef(containerID)
if !ok {
glog.Warningf("No ref for container %q", containerID)
continue
}
// Note that 'rkt id' is the pod id.
uuid := utilstrings.ShortenString(id.uuid, 8)
switch reason {
case "Created":
r.recorder.Eventf(ref, api.EventTypeNormal, kubecontainer.CreatedContainer, "Created with rkt id %v", uuid)
case "Started":
r.recorder.Eventf(ref, api.EventTypeNormal, kubecontainer.StartedContainer, "Started with rkt id %v", uuid)
case "Failed":
r.recorder.Eventf(ref, api.EventTypeWarning, kubecontainer.FailedToStartContainer, "Failed to start with rkt id %v with error %v", uuid, failure)
case "Killing":
r.recorder.Eventf(ref, api.EventTypeNormal, kubecontainer.KillingContainer, "Killing with rkt id %v", uuid)
default:
glog.Errorf("rkt: Unexpected event %q", reason)
}
}
return
}
// RunPod first creates the unit file for a pod, and then
// starts the unit over d-bus.
func (r *Runtime) RunPod(pod *api.Pod, pullSecrets []api.Secret) error {
glog.V(4).Infof("Rkt starts to run pod: name %q.", format.Pod(pod))
name, runtimePod, prepareErr := r.preparePod(pod, pullSecrets)
// Set container references and generate events.
// If preparedPod fails, then send out 'failed' events for each container.
// Otherwise, store the container references so we can use them later to send events.
for i, c := range pod.Spec.Containers {
ref, err := kubecontainer.GenerateContainerRef(pod, &c)
if err != nil {
glog.Errorf("Couldn't make a ref to pod %q, container %v: '%v'", format.Pod(pod), c.Name, err)
continue
}
if prepareErr != nil {
r.recorder.Eventf(ref, api.EventTypeWarning, kubecontainer.FailedToCreateContainer, "Failed to create rkt container with error: %v", prepareErr)
continue
}
containerID := runtimePod.Containers[i].ID
r.containerRefManager.SetRef(containerID, ref)
}
if prepareErr != nil {
return prepareErr
}
r.generateEvents(runtimePod, "Created", nil)
// RestartUnit has the same effect as StartUnit if the unit is not running, besides it can restart
// a unit if the unit file is changed and reloaded.
reschan := make(chan string)
_, err := r.systemd.RestartUnit(name, "replace", reschan)
if err != nil {
r.generateEvents(runtimePod, "Failed", err)
return err
}
res := <-reschan
if res != "done" {
err := fmt.Errorf("Failed to restart unit %q: %s", name, res)
r.generateEvents(runtimePod, "Failed", err)
return err
}
r.generateEvents(runtimePod, "Started", nil)
return nil
}
// convertRktPod will convert a rktapi.Pod to a kubecontainer.Pod
func (r *Runtime) convertRktPod(rktpod *rktapi.Pod) (*kubecontainer.Pod, error) {
manifest := &appcschema.PodManifest{}
err := json.Unmarshal(rktpod.Manifest, manifest)
if err != nil {
return nil, err
}
podUID, ok := manifest.Annotations.Get(k8sRktUIDAnno)
if !ok {
return nil, fmt.Errorf("pod is missing annotation %s", k8sRktUIDAnno)
}
podName, ok := manifest.Annotations.Get(k8sRktNameAnno)
if !ok {
return nil, fmt.Errorf("pod is missing annotation %s", k8sRktNameAnno)
}
podNamespace, ok := manifest.Annotations.Get(k8sRktNamespaceAnno)
if !ok {
return nil, fmt.Errorf("pod is missing annotation %s", k8sRktNamespaceAnno)
}
podCreatedString, ok := manifest.Annotations.Get(k8sRktCreationTimeAnno)
if !ok {
return nil, fmt.Errorf("pod is missing annotation %s", k8sRktCreationTimeAnno)
}
podCreated, err := strconv.ParseInt(podCreatedString, 10, 64)
if err != nil {
return nil, fmt.Errorf("couldn't parse pod creation timestamp: %v", err)
}
kubepod := &kubecontainer.Pod{
ID: types.UID(podUID),
Name: podName,
Namespace: podNamespace,
}
for i, app := range rktpod.Apps {
// The order of the apps is determined by the rkt pod manifest.
// TODO(yifan): Let the server to unmarshal the annotations? https://github.com/coreos/rkt/issues/1872
hashStr, ok := manifest.Apps[i].Annotations.Get(k8sRktContainerHashAnno)
if !ok {
return nil, fmt.Errorf("app %q is missing annotation %s", app.Name, k8sRktContainerHashAnno)
}
containerHash, err := strconv.ParseUint(hashStr, 10, 64)
if err != nil {
return nil, fmt.Errorf("couldn't parse container's hash %q: %v", hashStr, err)
}
kubepod.Containers = append(kubepod.Containers, &kubecontainer.Container{
ID: buildContainerID(&containerID{rktpod.Id, app.Name}),
Name: app.Name,
Image: app.Image.Name,
Hash: containerHash,
Created: podCreated,
State: appStateToContainerState(app.State),
})
}
return kubepod, nil
}
// GetPods runs 'systemctl list-unit' and 'rkt list' to get the list of rkt pods.
// Then it will use the result to construct a list of container runtime pods.
// If all is false, then only running pods will be returned, otherwise all pods will be
// returned.
func (r *Runtime) GetPods(all bool) ([]*kubecontainer.Pod, error) {
glog.V(4).Infof("Rkt getting pods")
listReq := &rktapi.ListPodsRequest{
Detail: true,
Filters: []*rktapi.PodFilter{
{
Annotations: []*rktapi.KeyValue{
{
Key: k8sRktKubeletAnno,
Value: k8sRktKubeletAnnoValue,
},
},
},
},
}
if !all {
listReq.Filters[0].States = []rktapi.PodState{rktapi.PodState_POD_STATE_RUNNING}
}
listResp, err := r.apisvc.ListPods(context.Background(), listReq)
if err != nil {
return nil, fmt.Errorf("couldn't list pods: %v", err)
}