/
executor_kubernetes.go
755 lines (624 loc) · 20.3 KB
/
executor_kubernetes.go
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package kubernetes
import (
"encoding/json"
"fmt"
"strings"
"sync"
"github.com/sirupsen/logrus"
"golang.org/x/net/context"
api "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/util/intstr"
"k8s.io/client-go/kubernetes"
_ "k8s.io/client-go/plugin/pkg/client/auth" // Register all available authentication methods
"gitlab.com/gitlab-org/gitlab-runner/common"
"gitlab.com/gitlab-org/gitlab-runner/executors"
"gitlab.com/gitlab-org/gitlab-runner/helpers/dns"
"gitlab.com/gitlab-org/gitlab-runner/helpers/docker/helperimage"
"gitlab.com/gitlab-org/gitlab-runner/session/proxy"
)
const (
buildContainerName = "build"
helperContainerName = "helper"
)
var (
executorOptions = executors.ExecutorOptions{
DefaultCustomBuildsDirEnabled: true,
DefaultBuildsDir: "/builds",
DefaultCacheDir: "/cache",
SharedBuildsDir: false,
Shell: common.ShellScriptInfo{
Shell: "bash",
Type: common.NormalShell,
RunnerCommand: "/usr/bin/gitlab-runner-helper",
},
ShowHostname: true,
}
)
type kubernetesOptions struct {
Image common.Image
Services common.Services
}
type executor struct {
executors.AbstractExecutor
kubeClient *kubernetes.Clientset
pod *api.Pod
credentials *api.Secret
options *kubernetesOptions
services []api.Service
configurationOverwrites *overwrites
buildLimits api.ResourceList
serviceLimits api.ResourceList
helperLimits api.ResourceList
buildRequests api.ResourceList
serviceRequests api.ResourceList
helperRequests api.ResourceList
pullPolicy common.KubernetesPullPolicy
helperImageInfo helperimage.Info
}
type serviceDeleteResponse struct {
serviceName string
err error
}
type serviceCreateResponse struct {
service *api.Service
err error
}
func (s *executor) setupResources() error {
var err error
// Limit
if s.buildLimits, err = limits(s.Config.Kubernetes.CPULimit, s.Config.Kubernetes.MemoryLimit); err != nil {
return fmt.Errorf("invalid build limits specified: %s", err.Error())
}
if s.serviceLimits, err = limits(s.Config.Kubernetes.ServiceCPULimit, s.Config.Kubernetes.ServiceMemoryLimit); err != nil {
return fmt.Errorf("invalid service limits specified: %s", err.Error())
}
if s.helperLimits, err = limits(s.Config.Kubernetes.HelperCPULimit, s.Config.Kubernetes.HelperMemoryLimit); err != nil {
return fmt.Errorf("invalid helper limits specified: %s", err.Error())
}
// Requests
if s.buildRequests, err = limits(s.Config.Kubernetes.CPURequest, s.Config.Kubernetes.MemoryRequest); err != nil {
return fmt.Errorf("invalid build requests specified: %s", err.Error())
}
if s.serviceRequests, err = limits(s.Config.Kubernetes.ServiceCPURequest, s.Config.Kubernetes.ServiceMemoryRequest); err != nil {
return fmt.Errorf("invalid service requests specified: %s", err.Error())
}
if s.helperRequests, err = limits(s.Config.Kubernetes.HelperCPURequest, s.Config.Kubernetes.HelperMemoryRequest); err != nil {
return fmt.Errorf("invalid helper requests specified: %s", err.Error())
}
return nil
}
func (s *executor) Prepare(options common.ExecutorPrepareOptions) (err error) {
if err = s.AbstractExecutor.Prepare(options); err != nil {
return err
}
if s.BuildShell.PassFile {
return fmt.Errorf("kubernetes doesn't support shells that require script file")
}
if err = s.setupResources(); err != nil {
return err
}
if s.pullPolicy, err = s.Config.Kubernetes.PullPolicy.Get(); err != nil {
return err
}
if err = s.prepareOverwrites(options.Build.Variables); err != nil {
return err
}
s.prepareOptions(options.Build)
if err = s.checkDefaults(); err != nil {
return err
}
if s.kubeClient, err = getKubeClient(options.Config.Kubernetes, s.configurationOverwrites); err != nil {
return fmt.Errorf("error connecting to Kubernetes: %s", err.Error())
}
s.Println("Using Kubernetes executor with image", s.options.Image.Name, "...")
return nil
}
func (s *executor) Run(cmd common.ExecutorCommand) error {
s.Debugln("Starting Kubernetes command...")
if s.pod == nil {
err := s.setupCredentials()
if err != nil {
return err
}
err = s.setupBuildPod()
if err != nil {
return err
}
}
containerName := buildContainerName
containerCommand := s.BuildShell.DockerCommand
if cmd.Predefined {
containerName = helperContainerName
containerCommand = s.helperImageInfo.Cmd
}
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
s.Debugln(fmt.Sprintf(
"Starting in container %q the command %q with script: %s",
containerName,
containerCommand,
cmd.Script,
))
select {
case err := <-s.runInContainer(ctx, containerName, containerCommand, cmd.Script):
s.Debugln(fmt.Sprintf("Container %q exited with error: %v", containerName, err))
if err != nil && strings.Contains(err.Error(), "command terminated with exit code") {
return &common.BuildError{Inner: err}
}
return err
case <-cmd.Context.Done():
return fmt.Errorf("build aborted")
}
}
func (s *executor) Cleanup() {
if s.pod != nil {
err := s.kubeClient.CoreV1().Pods(s.pod.Namespace).Delete(s.pod.Name, &metav1.DeleteOptions{})
if err != nil {
s.Errorln(fmt.Sprintf("Error cleaning up pod: %s", err.Error()))
}
}
if s.credentials != nil {
err := s.kubeClient.CoreV1().Secrets(s.configurationOverwrites.namespace).Delete(s.credentials.Name, &metav1.DeleteOptions{})
if err != nil {
s.Errorln(fmt.Sprintf("Error cleaning up secrets: %s", err.Error()))
}
}
ch := make(chan serviceDeleteResponse)
var wg sync.WaitGroup
wg.Add(len(s.services))
for _, service := range s.services {
go s.deleteKubernetesService(service.ObjectMeta.Name, ch, &wg)
}
go func() {
wg.Wait()
close(ch)
}()
for res := range ch {
if res.err != nil {
s.Errorln(fmt.Sprintf("Error cleaning up the pod service %q: %v", res.serviceName, res.err))
}
}
closeKubeClient(s.kubeClient)
s.AbstractExecutor.Cleanup()
}
func (s *executor) deleteKubernetesService(serviceName string, ch chan<- serviceDeleteResponse, wg *sync.WaitGroup) {
defer wg.Done()
err := s.kubeClient.CoreV1().Services(s.configurationOverwrites.namespace).Delete(serviceName, &metav1.DeleteOptions{})
ch <- serviceDeleteResponse{serviceName: serviceName, err: err}
}
func (s *executor) buildContainer(name, image string, imageDefinition common.Image, requests, limits api.ResourceList, containerCommand ...string) api.Container {
privileged := false
containerPorts := make([]api.ContainerPort, len(imageDefinition.Ports))
proxyPorts := make([]proxy.Port, len(imageDefinition.Ports))
for i, port := range imageDefinition.Ports {
proxyPorts[i] = proxy.Port{Name: port.Name, Number: port.Number, Protocol: port.Protocol}
containerPorts[i] = api.ContainerPort{ContainerPort: int32(port.Number)}
}
if len(proxyPorts) > 0 {
serviceName := imageDefinition.Alias
if serviceName == "" {
serviceName = name
if name != buildContainerName {
serviceName = fmt.Sprintf("proxy-%s", name)
}
}
s.ProxyPool[serviceName] = s.newProxy(serviceName, proxyPorts)
}
if s.Config.Kubernetes != nil {
privileged = s.Config.Kubernetes.Privileged
}
command, args := s.getCommandAndArgs(imageDefinition, containerCommand...)
return api.Container{
Name: name,
Image: image,
ImagePullPolicy: api.PullPolicy(s.pullPolicy),
Command: command,
Args: args,
Env: buildVariables(s.Build.GetAllVariables().PublicOrInternal()),
Resources: api.ResourceRequirements{
Limits: limits,
Requests: requests,
},
Ports: containerPorts,
VolumeMounts: s.getVolumeMounts(),
SecurityContext: &api.SecurityContext{
Privileged: &privileged,
},
Stdin: true,
}
}
func (s *executor) getCommandAndArgs(imageDefinition common.Image, command ...string) ([]string, []string) {
if len(command) == 0 && len(imageDefinition.Entrypoint) > 0 {
command = imageDefinition.Entrypoint
}
var args []string
if len(imageDefinition.Command) > 0 {
args = imageDefinition.Command
}
return command, args
}
func (s *executor) getVolumeMounts() (mounts []api.VolumeMount) {
mounts = append(mounts, api.VolumeMount{
Name: "repo",
MountPath: s.Build.RootDir,
})
for _, mount := range s.Config.Kubernetes.Volumes.HostPaths {
mounts = append(mounts, api.VolumeMount{
Name: mount.Name,
MountPath: mount.MountPath,
ReadOnly: mount.ReadOnly,
})
}
for _, mount := range s.Config.Kubernetes.Volumes.Secrets {
mounts = append(mounts, api.VolumeMount{
Name: mount.Name,
MountPath: mount.MountPath,
ReadOnly: mount.ReadOnly,
})
}
for _, mount := range s.Config.Kubernetes.Volumes.PVCs {
mounts = append(mounts, api.VolumeMount{
Name: mount.Name,
MountPath: mount.MountPath,
ReadOnly: mount.ReadOnly,
})
}
for _, mount := range s.Config.Kubernetes.Volumes.ConfigMaps {
mounts = append(mounts, api.VolumeMount{
Name: mount.Name,
MountPath: mount.MountPath,
ReadOnly: mount.ReadOnly,
})
}
for _, mount := range s.Config.Kubernetes.Volumes.EmptyDirs {
mounts = append(mounts, api.VolumeMount{
Name: mount.Name,
MountPath: mount.MountPath,
})
}
return
}
func (s *executor) getVolumes() (volumes []api.Volume) {
volumes = append(volumes, api.Volume{
Name: "repo",
VolumeSource: api.VolumeSource{
EmptyDir: &api.EmptyDirVolumeSource{},
},
})
for _, volume := range s.Config.Kubernetes.Volumes.HostPaths {
path := volume.HostPath
// Make backward compatible with syntax introduced in version 9.3.0
if path == "" {
path = volume.MountPath
}
volumes = append(volumes, api.Volume{
Name: volume.Name,
VolumeSource: api.VolumeSource{
HostPath: &api.HostPathVolumeSource{
Path: path,
},
},
})
}
for _, volume := range s.Config.Kubernetes.Volumes.Secrets {
items := []api.KeyToPath{}
for key, path := range volume.Items {
items = append(items, api.KeyToPath{Key: key, Path: path})
}
volumes = append(volumes, api.Volume{
Name: volume.Name,
VolumeSource: api.VolumeSource{
Secret: &api.SecretVolumeSource{
SecretName: volume.Name,
Items: items,
},
},
})
}
for _, volume := range s.Config.Kubernetes.Volumes.PVCs {
volumes = append(volumes, api.Volume{
Name: volume.Name,
VolumeSource: api.VolumeSource{
PersistentVolumeClaim: &api.PersistentVolumeClaimVolumeSource{
ClaimName: volume.Name,
ReadOnly: volume.ReadOnly,
},
},
})
}
for _, volume := range s.Config.Kubernetes.Volumes.ConfigMaps {
items := []api.KeyToPath{}
for key, path := range volume.Items {
items = append(items, api.KeyToPath{Key: key, Path: path})
}
volumes = append(volumes, api.Volume{
Name: volume.Name,
VolumeSource: api.VolumeSource{
ConfigMap: &api.ConfigMapVolumeSource{
LocalObjectReference: api.LocalObjectReference{
Name: volume.Name,
},
Items: items,
},
},
})
}
for _, volume := range s.Config.Kubernetes.Volumes.EmptyDirs {
volumes = append(volumes, api.Volume{
Name: volume.Name,
VolumeSource: api.VolumeSource{
EmptyDir: &api.EmptyDirVolumeSource{
Medium: api.StorageMedium(volume.Medium),
},
},
})
}
return
}
type dockerConfigEntry struct {
Username, Password string
}
func (s *executor) projectUniqueName() string {
return dns.MakeRFC1123Compatible(s.Build.ProjectUniqueName())
}
func (s *executor) setupCredentials() error {
authConfigs := make(map[string]dockerConfigEntry)
for _, credentials := range s.Build.Credentials {
if credentials.Type != "registry" {
continue
}
authConfigs[credentials.URL] = dockerConfigEntry{
Username: credentials.Username,
Password: credentials.Password,
}
}
if len(authConfigs) == 0 {
return nil
}
dockerCfgContent, err := json.Marshal(authConfigs)
if err != nil {
return err
}
secret := api.Secret{}
secret.GenerateName = s.projectUniqueName()
secret.Namespace = s.configurationOverwrites.namespace
secret.Type = api.SecretTypeDockercfg
secret.Data = map[string][]byte{}
secret.Data[api.DockerConfigKey] = dockerCfgContent
s.credentials, err = s.kubeClient.CoreV1().Secrets(s.configurationOverwrites.namespace).Create(&secret)
if err != nil {
return err
}
return nil
}
func (s *executor) setupBuildPod() error {
services := make([]api.Container, len(s.options.Services))
for i, service := range s.options.Services {
resolvedImage := s.Build.GetAllVariables().ExpandValue(service.Name)
services[i] = s.buildContainer(fmt.Sprintf("svc-%d", i), resolvedImage, service, s.serviceRequests, s.serviceLimits)
}
// We set a default label to the pod. This label will be used later
// by the services, to link each service to the pod
labels := map[string]string{"pod": s.projectUniqueName()}
for k, v := range s.Build.Runner.Kubernetes.PodLabels {
labels[k] = s.Build.Variables.ExpandValue(v)
}
annotations := make(map[string]string)
for key, val := range s.configurationOverwrites.podAnnotations {
annotations[key] = s.Build.Variables.ExpandValue(val)
}
var imagePullSecrets []api.LocalObjectReference
for _, imagePullSecret := range s.Config.Kubernetes.ImagePullSecrets {
imagePullSecrets = append(imagePullSecrets, api.LocalObjectReference{Name: imagePullSecret})
}
if s.credentials != nil {
imagePullSecrets = append(imagePullSecrets, api.LocalObjectReference{Name: s.credentials.Name})
}
podConfig := s.preparePodConfig(labels, annotations, services, imagePullSecrets)
pod, err := s.kubeClient.CoreV1().Pods(s.configurationOverwrites.namespace).Create(&podConfig)
if err != nil {
return err
}
s.pod = pod
s.services, err = s.makePodProxyServices()
if err != nil {
return err
}
return nil
}
func (s *executor) preparePodConfig(labels, annotations map[string]string, services []api.Container, imagePullSecrets []api.LocalObjectReference) api.Pod {
buildImage := s.Build.GetAllVariables().ExpandValue(s.options.Image.Name)
return api.Pod{
ObjectMeta: metav1.ObjectMeta{
GenerateName: s.projectUniqueName(),
Namespace: s.configurationOverwrites.namespace,
Labels: labels,
Annotations: annotations,
},
Spec: api.PodSpec{
Volumes: s.getVolumes(),
ServiceAccountName: s.configurationOverwrites.serviceAccount,
RestartPolicy: api.RestartPolicyNever,
NodeSelector: s.Config.Kubernetes.NodeSelector,
Tolerations: s.Config.Kubernetes.GetNodeTolerations(),
Containers: append([]api.Container{
// TODO use the build and helper template here
s.buildContainer(buildContainerName, buildImage, s.options.Image, s.buildRequests, s.buildLimits, s.BuildShell.DockerCommand...),
s.buildContainer(helperContainerName, s.getHelperImage(), common.Image{}, s.helperRequests, s.helperLimits, s.BuildShell.DockerCommand...),
}, services...),
TerminationGracePeriodSeconds: &s.Config.Kubernetes.TerminationGracePeriodSeconds,
ImagePullSecrets: imagePullSecrets,
SecurityContext: s.Config.Kubernetes.GetPodSecurityContext(),
},
}
}
func (s *executor) getHelperImage() string {
if len(s.Config.Kubernetes.HelperImage) > 0 {
return common.AppVersion.Variables().ExpandValue(s.Config.Kubernetes.HelperImage)
}
return s.helperImageInfo.String()
}
func (s *executor) makePodProxyServices() ([]api.Service, error) {
ch := make(chan serviceCreateResponse)
var wg sync.WaitGroup
wg.Add(len(s.ProxyPool))
for serviceName, serviceProxy := range s.ProxyPool {
serviceName := dns.MakeRFC1123Compatible(serviceName)
servicePorts := make([]api.ServicePort, len(serviceProxy.Settings.Ports))
for i, port := range serviceProxy.Settings.Ports {
// When there is more than one port Kubernetes requires a port name
portName := fmt.Sprintf("%s-%d", serviceName, port.Number)
servicePorts[i] = api.ServicePort{Port: int32(port.Number), TargetPort: intstr.FromInt(port.Number), Name: portName}
}
serviceConfig := s.prepareServiceConfig(serviceName, servicePorts)
go s.createKubernetesService(&serviceConfig, serviceProxy.Settings, ch, &wg)
}
go func() {
wg.Wait()
close(ch)
}()
var services []api.Service
for res := range ch {
if res.err != nil {
err := fmt.Errorf("error creating the proxy service %q: %v", res.service.Name, res.err)
s.Errorln(err)
return []api.Service{}, err
}
services = append(services, *res.service)
}
return services, nil
}
func (s *executor) prepareServiceConfig(name string, ports []api.ServicePort) api.Service {
return api.Service{
ObjectMeta: metav1.ObjectMeta{
GenerateName: name,
Namespace: s.configurationOverwrites.namespace,
},
Spec: api.ServiceSpec{
Ports: ports,
Selector: map[string]string{"pod": s.projectUniqueName()},
Type: api.ServiceTypeClusterIP,
},
}
}
func (s *executor) createKubernetesService(service *api.Service, proxySettings *proxy.Settings, ch chan<- serviceCreateResponse, wg *sync.WaitGroup) {
defer wg.Done()
service, err := s.kubeClient.CoreV1().Services(s.pod.Namespace).Create(service)
if err == nil {
// Updating the internal service name reference and activating the proxy
proxySettings.ServiceName = service.Name
}
ch <- serviceCreateResponse{service: service, err: err}
}
func (s *executor) runInContainer(ctx context.Context, name string, command []string, script string) <-chan error {
errc := make(chan error, 1)
go func() {
defer close(errc)
status, err := waitForPodRunning(ctx, s.kubeClient, s.pod, s.Trace, s.Config.Kubernetes)
if err != nil {
errc <- err
return
}
if status != api.PodRunning {
errc <- fmt.Errorf("pod failed to enter running state: %s", status)
return
}
config, err := getKubeClientConfig(s.Config.Kubernetes, s.configurationOverwrites)
if err != nil {
errc <- err
return
}
exec := ExecOptions{
PodName: s.pod.Name,
Namespace: s.pod.Namespace,
ContainerName: name,
Command: command,
In: strings.NewReader(script),
Out: s.Trace,
Err: s.Trace,
Stdin: true,
Config: config,
Client: s.kubeClient,
Executor: &DefaultRemoteExecutor{},
}
errc <- exec.Run()
}()
return errc
}
func (s *executor) prepareOverwrites(variables common.JobVariables) error {
values, err := createOverwrites(s.Config.Kubernetes, variables, s.BuildLogger)
if err != nil {
return err
}
s.configurationOverwrites = values
return nil
}
func (s *executor) prepareOptions(build *common.Build) {
s.options = &kubernetesOptions{}
s.options.Image = build.Image
s.getServices(build)
}
func (s *executor) getServices(build *common.Build) {
for _, service := range s.Config.Kubernetes.Services {
if service.Name == "" {
continue
}
s.options.Services = append(s.options.Services, common.Image{Name: service.Name})
}
for _, service := range build.Services {
if service.Name == "" {
continue
}
s.options.Services = append(s.options.Services, service)
}
}
// checkDefaults Defines the configuration for the Pod on Kubernetes
func (s *executor) checkDefaults() error {
if s.options.Image.Name == "" {
if s.Config.Kubernetes.Image == "" {
return fmt.Errorf("no image specified and no default set in config")
}
s.options.Image = common.Image{
Name: s.Config.Kubernetes.Image,
}
}
if s.configurationOverwrites.namespace == "" {
s.Warningln("Namespace is empty, therefore assuming 'default'.")
s.configurationOverwrites.namespace = "default"
}
s.Println("Using Kubernetes namespace:", s.configurationOverwrites.namespace)
return nil
}
func createFn() common.Executor {
helperImageInfo, err := helperimage.Get(common.REVISION, helperimage.Config{
OSType: helperimage.OSTypeLinux,
Architecture: "amd64",
})
if err != nil {
logrus.WithError(err).Fatal("Failed to set up helper image for kubernetes executor")
}
return &executor{
AbstractExecutor: executors.AbstractExecutor{
ExecutorOptions: executorOptions,
},
helperImageInfo: helperImageInfo,
}
}
func featuresFn(features *common.FeaturesInfo) {
features.Variables = true
features.Image = true
features.Services = true
features.Artifacts = true
features.Cache = true
features.Session = true
features.Terminal = true
features.Proxy = true
}
func init() {
common.RegisterExecutor("kubernetes", executors.DefaultExecutorProvider{
Creator: createFn,
FeaturesUpdater: featuresFn,
DefaultShellName: executorOptions.Shell.Shell,
})
}