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runner: Use Docker socket via shared emptyDir instead of TCP/mTLS (#2324) 

Co-authored-by: Yusuke Kuoka <ykuoka@gmail.com>
This commit is contained in:
Milas Bowman 2023-03-27 22:29:16 -04:00 committed by GitHub
parent 4536707af6
commit 878c9b8b49
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 143 additions and 95 deletions
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116
controllers/actions.summerwind.net/new_runner_pod_test.go
View File

@ -76,9 +76,12 @@ func TestNewRunnerPod(t *testing.T) {
},
},
{
Name: "certs-client",
Name: "docker-sock",
VolumeSource: corev1.VolumeSource{
EmptyDir: &corev1.EmptyDirVolumeSource{},
EmptyDir: &corev1.EmptyDirVolumeSource{
Medium: corev1.StorageMediumMemory,
SizeLimit: resource.NewScaledQuantity(1, resource.Mega),
},
},
},
},
@ -137,15 +140,7 @@ func TestNewRunnerPod(t *testing.T) {
},
{
Name: "DOCKER_HOST",
Value: "tcp://localhost:2376",
},
{
Name: "DOCKER_TLS_VERIFY",
Value: "1",
},
{
Name: "DOCKER_CERT_PATH",
Value: "/certs/client",
Value: "unix:///run/docker/docker.sock",
},
},
VolumeMounts: []corev1.VolumeMount{
@ -158,9 +153,8 @@ func TestNewRunnerPod(t *testing.T) {
MountPath: "/runner/_work",
},
{
Name: "certs-client",
MountPath: "/certs/client",
ReadOnly: true,
Name: "docker-sock",
MountPath: "/run/docker",
},
},
ImagePullPolicy: corev1.PullAlways,
@ -169,10 +163,15 @@ func TestNewRunnerPod(t *testing.T) {
{
Name: "docker",
Image: "default-docker-image",
Args: []string{
"dockerd",
"--host=unix:///run/docker/docker.sock",
"--group=$(DOCKER_GROUP_GID)",
},
Env: []corev1.EnvVar{
{
Name: "DOCKER_TLS_CERTDIR",
Value: "/certs",
Name: "DOCKER_GROUP_GID",
Value: "121",
},
},
VolumeMounts: []corev1.VolumeMount{
@ -181,8 +180,8 @@ func TestNewRunnerPod(t *testing.T) {
MountPath: "/runner",
},
{
Name: "certs-client",
MountPath: "/certs/client",
Name: "docker-sock",
MountPath: "/run/docker",
},
{
Name: "work",
@ -485,9 +484,12 @@ func TestNewRunnerPod(t *testing.T) {
},
},
{
Name: "certs-client",
Name: "docker-sock",
VolumeSource: corev1.VolumeSource{
EmptyDir: &corev1.EmptyDirVolumeSource{},
EmptyDir: &corev1.EmptyDirVolumeSource{
Medium: corev1.StorageMediumMemory,
SizeLimit: resource.NewScaledQuantity(1, resource.Mega),
},
},
},
}
@ -501,9 +503,8 @@ func TestNewRunnerPod(t *testing.T) {
MountPath: "/runner",
},
{
Name: "certs-client",
MountPath: "/certs/client",
ReadOnly: true,
Name: "docker-sock",
MountPath: "/run/docker",
},
}
}),
@ -527,9 +528,12 @@ func TestNewRunnerPod(t *testing.T) {
},
},
{
Name: "certs-client",
Name: "docker-sock",
VolumeSource: corev1.VolumeSource{
EmptyDir: &corev1.EmptyDirVolumeSource{},
EmptyDir: &corev1.EmptyDirVolumeSource{
Medium: corev1.StorageMediumMemory,
SizeLimit: resource.NewScaledQuantity(1, resource.Mega),
},
},
},
}
@ -606,9 +610,12 @@ func TestNewRunnerPodFromRunnerController(t *testing.T) {
},
},
{
Name: "certs-client",
Name: "docker-sock",
VolumeSource: corev1.VolumeSource{
EmptyDir: &corev1.EmptyDirVolumeSource{},
EmptyDir: &corev1.EmptyDirVolumeSource{
Medium: corev1.StorageMediumMemory,
SizeLimit: resource.NewScaledQuantity(1, resource.Mega),
},
},
},
},
@ -667,15 +674,7 @@ func TestNewRunnerPodFromRunnerController(t *testing.T) {
},
{
Name: "DOCKER_HOST",
Value: "tcp://localhost:2376",
},
{
Name: "DOCKER_TLS_VERIFY",
Value: "1",
},
{
Name: "DOCKER_CERT_PATH",
Value: "/certs/client",
Value: "unix:///run/docker/docker.sock",
},
{
Name: "RUNNER_NAME",
@ -696,9 +695,8 @@ func TestNewRunnerPodFromRunnerController(t *testing.T) {
MountPath: "/runner/_work",
},
{
Name: "certs-client",
MountPath: "/certs/client",
ReadOnly: true,
Name: "docker-sock",
MountPath: "/run/docker",
},
},
ImagePullPolicy: corev1.PullAlways,
@ -707,10 +705,15 @@ func TestNewRunnerPodFromRunnerController(t *testing.T) {
{
Name: "docker",
Image: "default-docker-image",
Args: []string{
"dockerd",
"--host=unix:///run/docker/docker.sock",
"--group=$(DOCKER_GROUP_GID)",
},
Env: []corev1.EnvVar{
{
Name: "DOCKER_TLS_CERTDIR",
Value: "/certs",
Name: "DOCKER_GROUP_GID",
Value: "121",
},
},
VolumeMounts: []corev1.VolumeMount{
@ -719,8 +722,8 @@ func TestNewRunnerPodFromRunnerController(t *testing.T) {
MountPath: "/runner",
},
{
Name: "certs-client",
MountPath: "/certs/client",
Name: "docker-sock",
MountPath: "/run/docker",
},
{
Name: "work",
@ -1079,6 +1082,10 @@ func TestNewRunnerPodFromRunnerController(t *testing.T) {
Name: "work",
MountPath: "/runner/_work",
},
{
Name: "docker-sock",
MountPath: "/run/docker",
},
},
},
},
@ -1097,9 +1104,12 @@ func TestNewRunnerPodFromRunnerController(t *testing.T) {
},
},
{
Name: "certs-client",
Name: "docker-sock",
VolumeSource: corev1.VolumeSource{
EmptyDir: &corev1.EmptyDirVolumeSource{},
EmptyDir: &corev1.EmptyDirVolumeSource{
Medium: corev1.StorageMediumMemory,
SizeLimit: resource.NewScaledQuantity(1, resource.Mega),
},
},
},
workGenericEphemeralVolume,
@ -1110,13 +1120,12 @@ func TestNewRunnerPodFromRunnerController(t *testing.T) {
MountPath: "/runner/_work",
},
{
Name: "runner",
MountPath: "/runner",
Name: "docker-sock",
MountPath: "/run/docker",
},
{
Name: "certs-client",
MountPath: "/certs/client",
ReadOnly: true,
Name: "runner",
MountPath: "/runner",
},
}
}),
@ -1144,9 +1153,12 @@ func TestNewRunnerPodFromRunnerController(t *testing.T) {
},
},
{
Name: "certs-client",
Name: "docker-sock",
VolumeSource: corev1.VolumeSource{
EmptyDir: &corev1.EmptyDirVolumeSource{},
EmptyDir: &corev1.EmptyDirVolumeSource{
Medium: corev1.StorageMediumMemory,
SizeLimit: resource.NewScaledQuantity(1, resource.Mega),
},
},
},
workGenericEphemeralVolume,

103
controllers/actions.summerwind.net/runner_controller.go
View File

@ -30,6 +30,7 @@ import (
"github.com/go-logr/logr"
kerrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/api/resource"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/client-go/tools/record"
ctrl "sigs.k8s.io/controller-runtime"
@ -1001,6 +1002,35 @@ func newRunnerPodWithContainerMode(containerMode string, template corev1.Pod, ru
)
}
// explicitly invoke `dockerd` to avoid automatic TLS / TCP binding
dockerdContainer.Args = append([]string{
"dockerd",
"--host=unix:///run/docker/docker.sock",
}, dockerdContainer.Args...)
// this must match a GID for the user in the runner image
// default matches GitHub Actions infra (and default runner images
// for actions-runner-controller) so typically should not need to be
// overridden
if ok, _ := envVarPresent("DOCKER_GROUP_GID", dockerdContainer.Env); !ok {
dockerdContainer.Env = append(dockerdContainer.Env,
corev1.EnvVar{
Name: "DOCKER_GROUP_GID",
Value: "121",
})
}
dockerdContainer.Args = append(dockerdContainer.Args, "--group=$(DOCKER_GROUP_GID)")
// ideally, we could mount the socket directly at `/var/run/docker.sock`
// to use the default, but that's not practical since it won't exist
// when the container starts, so can't use subPath on the volume mount
runnerContainer.Env = append(runnerContainer.Env,
corev1.EnvVar{
Name: "DOCKER_HOST",
Value: "unix:///run/docker/docker.sock",
},
)
if ok, _ := workVolumePresent(pod.Spec.Volumes); !ok {
pod.Spec.Volumes = append(pod.Spec.Volumes,
corev1.Volume{
@ -1014,9 +1044,12 @@ func newRunnerPodWithContainerMode(containerMode string, template corev1.Pod, ru
pod.Spec.Volumes = append(pod.Spec.Volumes,
corev1.Volume{
Name: "certs-client",
Name: "docker-sock",
VolumeSource: corev1.VolumeSource{
EmptyDir: &corev1.EmptyDirVolumeSource{},
EmptyDir: &corev1.EmptyDirVolumeSource{
Medium: corev1.StorageMediumMemory,
SizeLimit: resource.NewScaledQuantity(1, resource.Mega),
},
},
},
)
@ -1030,28 +1063,14 @@ func newRunnerPodWithContainerMode(containerMode string, template corev1.Pod, ru
)
}
runnerContainer.VolumeMounts = append(runnerContainer.VolumeMounts,
corev1.VolumeMount{
Name: "certs-client",
MountPath: "/certs/client",
ReadOnly: true,
},
)
runnerContainer.Env = append(runnerContainer.Env, []corev1.EnvVar{
{
Name: "DOCKER_HOST",
Value: "tcp://localhost:2376",
},
{
Name: "DOCKER_TLS_VERIFY",
Value: "1",
},
{
Name: "DOCKER_CERT_PATH",
Value: "/certs/client",
},
}...)
if ok, _ := volumeMountPresent("docker-sock", runnerContainer.VolumeMounts); !ok {
runnerContainer.VolumeMounts = append(runnerContainer.VolumeMounts,
corev1.VolumeMount{
Name: "docker-sock",
MountPath: "/run/docker",
},
)
}
// Determine the volume mounts assigned to the docker sidecar. In case extra mounts are included in the RunnerSpec, append them to the standard
// set of mounts. See https://github.com/actions/actions-runner-controller/issues/435 for context.
@ -1060,14 +1079,16 @@ func newRunnerPodWithContainerMode(containerMode string, template corev1.Pod, ru
Name: runnerVolumeName,
MountPath: runnerVolumeMountPath,
},
{
Name: "certs-client",
MountPath: "/certs/client",
},
}
mountPresent, _ := workVolumeMountPresent(dockerdContainer.VolumeMounts)
if !mountPresent {
if p, _ := volumeMountPresent("docker-sock", dockerdContainer.VolumeMounts); !p {
dockerVolumeMounts = append(dockerVolumeMounts, corev1.VolumeMount{
Name: "docker-sock",
MountPath: "/run/docker",
})
}
if p, _ := workVolumeMountPresent(dockerdContainer.VolumeMounts); !p {
dockerVolumeMounts = append(dockerVolumeMounts, corev1.VolumeMount{
Name: "work",
MountPath: workDir,
@ -1078,11 +1099,6 @@ func newRunnerPodWithContainerMode(containerMode string, template corev1.Pod, ru
dockerdContainer.Image = defaultDockerImage
}
dockerdContainer.Env = append(dockerdContainer.Env, corev1.EnvVar{
Name: "DOCKER_TLS_CERTDIR",
Value: "/certs",
})
if dockerdContainer.SecurityContext == nil {
dockerdContainer.SecurityContext = &corev1.SecurityContext{
Privileged: &privileged,
@ -1273,6 +1289,15 @@ func removeFinalizer(finalizers []string, finalizerName string) ([]string, bool)
return result, removed
}
func envVarPresent(name string, items []corev1.EnvVar) (bool, int) {
for index, item := range items {
if item.Name == name {
return true, index
}
}
return false, -1
}
func workVolumePresent(items []corev1.Volume) (bool, int) {
for index, item := range items {
if item.Name == "work" {
@ -1283,12 +1308,16 @@ func workVolumePresent(items []corev1.Volume) (bool, int) {
}
func workVolumeMountPresent(items []corev1.VolumeMount) (bool, int) {
return volumeMountPresent("work", items)
}
func volumeMountPresent(name string, items []corev1.VolumeMount) (bool, int) {
for index, item := range items {
if item.Name == "work" {
if item.Name == name {
return true, index
}
}
return false, 0
return false, -1
}
func applyWorkVolumeClaimTemplateToPod(pod *corev1.Pod, workVolumeClaimTemplate *v1alpha1.WorkVolumeClaimTemplate, workDir string) error {

19
test/e2e/e2e_test.go
View File

@ -1096,7 +1096,6 @@ func installActionsWorkflow(t *testing.T, testName, runnerLabel, testResultCMNam
if !kubernetesContainerMode {
setupBuildXActionWith := &testing.With{
BuildkitdFlags: "--debug",
Endpoint: "mycontext",
// As the consequence of setting `install: false`, it doesn't install buildx as an alias to `docker build`
// so we need to use `docker buildx build` in the next step
Install: false,
@ -1122,16 +1121,24 @@ func installActionsWorkflow(t *testing.T, testName, runnerLabel, testResultCMNam
setupBuildXActionWith.Driver = "docker"
dockerfile = "Dockerfile.nocache"
}
steps = append(steps,
testing.Step{
useCustomDockerContext := os.Getenv("ARC_E2E_USE_CUSTOM_DOCKER_CONTEXT") != ""
if useCustomDockerContext {
setupBuildXActionWith.Endpoint = "mycontext"
steps = append(steps, testing.Step{
// https://github.com/docker/buildx/issues/413#issuecomment-710660155
// To prevent setup-buildx-action from failing with:
// error: could not create a builder instance with TLS data loaded from environment. Please use `docker context create <context-name>` to create a context for current environment and then create a builder instance with `docker buildx create <context-name>`
Run: "docker context create mycontext",
},
testing.Step{
Run: "docker context use mycontext",
},
testing.Step{
Run: "docker context use mycontext",
},
)
}
steps = append(steps,
testing.Step{
Name: "Set up Docker Buildx",
Uses: "docker/setup-buildx-action@v1",