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docker.go
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docker.go
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package docker
import (
"archive/tar"
"bytes"
"context"
"encoding/base64"
"encoding/json"
"fmt"
"io"
"os"
"strings"
"time"
"github.com/rancher/rke/util"
"github.com/coreos/go-semver/semver"
ref "github.com/docker/distribution/reference"
"github.com/docker/docker/api/types"
"github.com/docker/docker/api/types/container"
"github.com/docker/docker/client"
"github.com/docker/docker/pkg/stdcopy"
"github.com/rancher/rke/log"
"github.com/rancher/rke/metadata"
v3 "github.com/rancher/rke/types"
"github.com/sirupsen/logrus"
"k8s.io/apimachinery/pkg/util/sets"
)
const (
DockerRegistryURL = "docker.io"
// RestartTimeout in seconds
RestartTimeout = 5
// StopTimeout in seconds
StopTimeout = 5
// RetryCount is the amount of retries for Docker operations
RetryCount = 3
// WaitTimeout in seconds
WaitTimeout = 300
// WaitTimeoutContextKey name
WaitTimeoutContextKey = "wait_timeout"
)
type dockerConfig struct {
Auths map[string]authConfig `json:"auths,omitempty"`
CredHelpers map[string]string `json:"credHelpers,omitempty"`
}
type authConfig types.AuthConfig
func DoRunContainer(ctx context.Context, dClient *client.Client, imageCfg *container.Config, hostCfg *container.HostConfig,
containerName string, hostname string, plane string, prsMap map[string]v3.PrivateRegistry) error {
if dClient == nil {
return fmt.Errorf("[%s] Failed to run container: docker client is nil for container [%s] on host [%s]",
plane, containerName, hostname)
}
container, err := InspectContainer(ctx, dClient, hostname, containerName)
if err != nil {
if !client.IsErrNotFound(err) {
return err
}
if err := UseLocalOrPull(ctx, dClient, hostname, imageCfg.Image, plane, prsMap); err != nil {
return fmt.Errorf("Failed to pull image [%s] on host [%s]: %v", imageCfg.Image, hostname, err)
}
_, err := CreateContainer(ctx, dClient, hostname, containerName, imageCfg, hostCfg)
if err != nil {
return fmt.Errorf("Failed to create [%s] container on host [%s]: %v", containerName, hostname, err)
}
if err := StartContainer(ctx, dClient, hostname, containerName); err != nil {
return fmt.Errorf("Failed to start [%s] container on host [%s]: %v", containerName, hostname, err)
}
log.Infof(ctx, "[%s] Successfully started [%s] container on host [%s]", plane, containerName, hostname)
return nil
}
// Check for upgrades
if container.State.Running {
// check if container is in a restarting loop
if container.State.Restarting {
logrus.Debugf("[%s] Container [%s] is in a restarting loop [%s]", plane, containerName, hostname)
err = RestartContainer(ctx, dClient, hostname, containerName)
if err != nil {
return err
}
}
logrus.Debugf("[%s] Container [%s] is already running on host [%s]", plane, containerName, hostname)
isUpgradable, err := IsContainerUpgradable(ctx, dClient, imageCfg, hostCfg, containerName, hostname, plane)
if err != nil {
return err
}
if isUpgradable {
return DoRollingUpdateContainer(ctx, dClient, imageCfg, hostCfg, containerName, hostname, plane, prsMap)
}
return nil
}
// start if not running
logrus.Infof("[%s] Starting stopped container [%s] on host [%s]", plane, containerName, hostname)
if err := StartContainer(ctx, dClient, hostname, containerName); err != nil {
return fmt.Errorf("Failed to start [%s] container on host [%s]: %v", containerName, hostname, err)
}
log.Infof(ctx, "[%s] Successfully started [%s] container on host [%s]", plane, containerName, hostname)
return nil
}
func DoRunOnetimeContainer(ctx context.Context, dClient *client.Client, imageCfg *container.Config, hostCfg *container.HostConfig, containerName string, hostname string, plane string, prsMap map[string]v3.PrivateRegistry) error {
if dClient == nil {
return fmt.Errorf("[%s] Failed to run container: docker client is nil for container [%s] on host [%s]", plane, containerName, hostname)
}
_, err := InspectContainer(ctx, dClient, hostname, containerName)
if err != nil {
if !client.IsErrNotFound(err) {
return err
}
if err := UseLocalOrPull(ctx, dClient, hostname, imageCfg.Image, plane, prsMap); err != nil {
return err
}
_, err := CreateContainer(ctx, dClient, hostname, containerName, imageCfg, hostCfg)
if err != nil {
return fmt.Errorf("Failed to create [%s] container on host [%s]: %v", containerName, hostname, err)
}
if err := StartContainer(ctx, dClient, hostname, containerName); err != nil {
return fmt.Errorf("Failed to start [%s] container on host [%s]: %v", containerName, hostname, err)
}
log.Infof(ctx, "Successfully started [%s] container on host [%s]", containerName, hostname)
log.Infof(ctx, "Waiting for [%s] container to exit on host [%s]", containerName, hostname)
exitCode, err := WaitForContainer(ctx, dClient, hostname, containerName, true)
if err != nil {
return fmt.Errorf("Container [%s] did not complete in time on host [%s]", containerName, hostname)
}
if exitCode != 0 {
stderr, stdout, err := GetContainerLogsStdoutStderr(ctx, dClient, containerName, "1", false)
if err != nil {
return fmt.Errorf("Unable to retrieve logs for container [%s] on host [%s]: %v", containerName, hostname, err)
}
stderr = strings.TrimSuffix(stderr, "\n")
stdout = strings.TrimSuffix(stdout, "\n")
return fmt.Errorf("Container [%s] exited with non-zero exit code [%d] on host [%s]: stdout: %s, stderr: %s", containerName, exitCode, hostname, stdout, stderr)
}
return nil
}
return err
}
func DoCopyToContainer(ctx context.Context, dClient *client.Client, plane, containerName, hostname, destinationDir string, tarFile io.Reader) error {
if dClient == nil {
return fmt.Errorf("[%s] Failed to run container: docker client is nil for container [%s] on host [%s]", plane, containerName, hostname)
}
// Need container.ID for CopyToContainer function
container, err := InspectContainer(ctx, dClient, hostname, containerName)
if err != nil {
return fmt.Errorf("Could not inspect container [%s] on host [%s]: %s", containerName, hostname, err)
}
err = dClient.CopyToContainer(ctx, container.ID, destinationDir, tarFile, types.CopyToContainerOptions{})
if err != nil {
return fmt.Errorf("Error while copying file to container [%s] on host [%s]: %v", containerName, hostname, err)
}
return nil
}
func DoRollingUpdateContainer(ctx context.Context, dClient *client.Client, imageCfg *container.Config, hostCfg *container.HostConfig, containerName, hostname, plane string, prsMap map[string]v3.PrivateRegistry) error {
if dClient == nil {
return fmt.Errorf("[%s] Failed rolling update of container: docker client is nil for container [%s] on host [%s]", plane, containerName, hostname)
}
logrus.Debugf("[%s] Checking for deployed [%s]", plane, containerName)
exists, err := DoesContainerExist(ctx, dClient, hostname, containerName, false)
if err != nil {
return err
}
if !exists {
logrus.Debugf("[%s] Container %s is not running on host [%s]", plane, containerName, hostname)
return nil
}
err = UseLocalOrPull(ctx, dClient, hostname, imageCfg.Image, plane, prsMap)
if err != nil {
return err
}
logrus.Debugf("[%s] Stopping old container", plane)
oldContainerName := "old-" + containerName
if err := StopRenameContainer(ctx, dClient, hostname, containerName, oldContainerName); err != nil {
return err
}
logrus.Debugf("[%s] Successfully stopped old container %s on host [%s]", plane, containerName, hostname)
_, err = CreateContainer(ctx, dClient, hostname, containerName, imageCfg, hostCfg)
if err != nil {
return fmt.Errorf("Failed to create [%s] container on host [%s]: %v", containerName, hostname, err)
}
if err := StartContainer(ctx, dClient, hostname, containerName); err != nil {
return fmt.Errorf("Failed to start [%s] container on host [%s]: %v", containerName, hostname, err)
}
log.Infof(ctx, "[%s] Successfully updated [%s] container on host [%s]", plane, containerName, hostname)
logrus.Debugf("[%s] Removing old container", plane)
err = RemoveContainer(ctx, dClient, hostname, oldContainerName)
return err
}
func DoRemoveContainer(ctx context.Context, dClient *client.Client, containerName, hostname string) error {
if dClient == nil {
return fmt.Errorf("Failed to remove container: docker client is nil for container [%s] on host [%s]", containerName, hostname)
}
logrus.Debugf("[remove/%s] Checking if container is running on host [%s]", containerName, hostname)
_, err := InspectContainer(ctx, dClient, hostname, containerName)
if err != nil {
if client.IsErrNotFound(err) {
logrus.Debugf("[remove/%s] Container doesn't exist on host [%s]", containerName, hostname)
return nil
}
return err
}
logrus.Debugf("[remove/%s] Removing container on host [%s]", containerName, hostname)
err = RemoveContainer(ctx, dClient, hostname, containerName)
if err != nil {
return err
}
log.Infof(ctx, "[remove/%s] Successfully removed container on host [%s]", containerName, hostname)
return nil
}
func FindContainer(ctx context.Context, dClient *client.Client, hostname string, containerName string, all bool) (*types.Container, error) {
if dClient == nil {
return nil, fmt.Errorf("Failed to find container: docker client is nil for container [%s] on host [%s]", containerName, hostname)
}
var containers []types.Container
var err error
for i := 1; i <= RetryCount; i++ {
logrus.Infof("Finding container [%s] on host [%s], try #%d", containerName, hostname, i)
containers, err = dClient.ContainerList(ctx, types.ContainerListOptions{All: all})
if err != nil {
logrus.Warnf("Error finding container [%s] exists on host [%s]: %v", containerName, hostname, err)
continue
}
break
}
if err != nil {
return nil, fmt.Errorf("Error checking if container [%s] exists on host [%s]: %v", containerName, hostname, err)
}
for _, container := range containers {
if len(container.Names) != 0 && container.Names[0] == "/"+containerName {
return &container, nil
}
}
return nil, nil
}
func DoesContainerExist(ctx context.Context, dClient *client.Client, hostname string, containerName string, all bool) (bool, error) {
if dClient == nil {
return false, fmt.Errorf("Failed to check if container exists: docker client is nil for container [%s] on host [%s]", containerName, hostname)
}
container, err := FindContainer(ctx, dClient, hostname, containerName, all)
if err != nil {
return false, fmt.Errorf("Error checking if container [%s] is running on host [%s]: %v", containerName, hostname, err)
}
return container != nil, nil
}
func IsContainerRunning(ctx context.Context, dClient *client.Client, hostname string, containerName string, all bool) (bool, error) {
if dClient == nil {
return false, fmt.Errorf("Failed to check if container is running: docker client is nil for container [%s] on host [%s]", containerName, hostname)
}
container, err := FindContainer(ctx, dClient, hostname, containerName, all)
if err != nil {
return false, fmt.Errorf("Error checking if container [%s] is running on host [%s]: %v", containerName, hostname, err)
}
return container != nil && container.State == "running", nil
}
func localImageExists(ctx context.Context, dClient *client.Client, hostname string, containerImage string) error {
var err error
for i := 1; i <= RetryCount; i++ {
logrus.Debugf("Checking if image [%s] exists on host [%s], try #%d", containerImage, hostname, i)
_, _, err = dClient.ImageInspectWithRaw(ctx, containerImage)
if err != nil {
if client.IsErrNotFound(err) {
logrus.Debugf("Image [%s] does not exist on host [%s]: %v", containerImage, hostname, err)
return err
}
logrus.Debugf("Error checking if image [%s] exists on host [%s]: %v", containerImage, hostname, err)
continue
}
logrus.Infof("Image [%s] exists on host [%s]", containerImage, hostname)
return nil
}
return fmt.Errorf("Error checking if image [%s] exists on host [%s]: %v", containerImage, hostname, err)
}
func pullImage(ctx context.Context, dClient *client.Client, hostname string, containerImage string,
prsMap map[string]v3.PrivateRegistry) error {
var out io.ReadCloser
var err error
pullOptions := types.ImagePullOptions{}
regAuth, prURL, err := GetImageRegistryConfig(containerImage, prsMap)
if err != nil {
return err
}
if regAuth != "" && prURL == DockerRegistryURL {
pullOptions.PrivilegeFunc = tryRegistryAuth(prsMap[prURL])
}
pullOptions.RegistryAuth = regAuth
// Retry up to RetryCount times to pull image
for i := 1; i <= RetryCount; i++ {
logrus.Infof("Pulling image [%s] on host [%s], try #%d", containerImage, hostname, i)
out, err = dClient.ImagePull(ctx, containerImage, pullOptions)
if err != nil {
logrus.Warnf("Can't pull Docker image [%s] on host [%s]: %v", containerImage, hostname, err)
continue
}
defer out.Close()
if logrus.GetLevel() == logrus.TraceLevel {
io.Copy(os.Stdout, out)
} else {
io.Copy(io.Discard, out)
}
return nil
}
// If the for loop does not return, return the error
return err
}
func UseLocalOrPull(ctx context.Context, dClient *client.Client, hostname string, containerImage string, plane string,
prsMap map[string]v3.PrivateRegistry) error {
if dClient == nil {
return fmt.Errorf("[%s] Failed to use local image or pull: docker client is nil for container [%s] on host [%s]", plane, containerImage, hostname)
}
var err error
// Retry up to RetryCount times to see if image exists
for i := 1; i <= RetryCount; i++ {
// Increasing wait time on retry, but not on the first two try
if i > 2 {
time.Sleep(time.Duration(i) * time.Second)
}
if err = localImageExists(ctx, dClient, hostname, containerImage); err == nil {
// Return if image exists to prevent pulling
return nil
}
// If error, log and retry
if !client.IsErrNotFound(err) {
logrus.Debugf("[%s] %v", plane, err)
continue
}
// Try pulling when not found and if error, log and retry
err = pullImage(ctx, dClient, hostname, containerImage, prsMap)
if err != nil {
logrus.Debugf("[%s] Can't pull Docker image [%s] on host [%s]: %v", plane, containerImage, hostname, err)
continue
}
}
// If the for loop does not return, return the error
if err != nil {
// Although error should be logged in the caller stack, logging the final error here just in case. Mostly
// because error logging was reduced in other places
logrus.Warnf("[%s] Can't pull Docker image [%s] on host [%s]: %v", plane, containerImage, hostname, err)
}
return err
}
func RemoveContainer(ctx context.Context, dClient *client.Client, hostname string, containerName string) error {
if dClient == nil {
return fmt.Errorf("Failed to remove container: docker client is nil for container [%s] on host [%s]", containerName, hostname)
}
var err error
// Retry up to RetryCount times to see if image exists
for i := 1; i <= RetryCount; i++ {
logrus.Infof("Removing container [%s] on host [%s], try #%d", containerName, hostname, i)
err = dClient.ContainerRemove(ctx, containerName, types.ContainerRemoveOptions{Force: true, RemoveVolumes: true})
if err != nil {
logrus.Warningf("Can't remove Docker container [%s] for host [%s]: %v", containerName, hostname, err)
continue
}
return nil
}
return err
}
func RestartContainer(ctx context.Context, dClient *client.Client, hostname, containerName string) error {
if dClient == nil {
return fmt.Errorf("Failed to restart container: docker client is nil for container [%s] on host [%s]", containerName, hostname)
}
var err error
restartTimeout := RestartTimeout * time.Second
// Retry up to RetryCount times to see if image exists
for i := 1; i <= RetryCount; i++ {
logrus.Infof("Restarting container [%s] on host [%s], try #%d", containerName, hostname, i)
err = dClient.ContainerRestart(ctx, containerName, &restartTimeout)
if err != nil {
logrus.Warningf("Can't restart Docker container [%s] for host [%s]: %v", containerName, hostname, err)
continue
}
return nil
}
return err
}
func StopContainer(ctx context.Context, dClient *client.Client, hostname string, containerName string) error {
if dClient == nil {
return fmt.Errorf("Failed to stop container: docker client is nil for container [%s] on host [%s]", containerName, hostname)
}
var err error
// define the stop timeout
stopTimeoutDuration := StopTimeout * time.Second
// Retry up to RetryCount times to see if image exists
for i := 1; i <= RetryCount; i++ {
logrus.Infof("Stopping container [%s] on host [%s] with stopTimeoutDuration [%s], try #%d", containerName, hostname, stopTimeoutDuration, i)
err = dClient.ContainerStop(ctx, containerName, &stopTimeoutDuration)
if err != nil {
logrus.Warningf("Can't stop Docker container [%s] for host [%s]: %v", containerName, hostname, err)
continue
}
return nil
}
return err
}
func RenameContainer(ctx context.Context, dClient *client.Client, hostname string, oldContainerName string, newContainerName string) error {
if dClient == nil {
return fmt.Errorf("Failed to rename container: docker client is nil for container [%s] on host [%s]", oldContainerName, hostname)
}
var err error
// Retry up to RetryCount times to see if image exists
for i := 1; i <= RetryCount; i++ {
logrus.Infof("Renaming container [%s] to [%s] on host [%s], try #%d", oldContainerName, newContainerName, hostname, i)
err = dClient.ContainerRename(ctx, oldContainerName, newContainerName)
if err != nil {
logrus.Warningf("Can't rename Docker container [%s] to [%s] for host [%s]: %v", oldContainerName, newContainerName, hostname, err)
continue
}
return nil
}
return err
}
func StartContainer(ctx context.Context, dClient *client.Client, hostname string, containerName string) error {
if dClient == nil {
return fmt.Errorf("Failed to start container: docker client is nil for container [%s] on host [%s]", containerName, hostname)
}
var err error
// Retry up to RetryCount times to see if image exists
for i := 1; i <= RetryCount; i++ {
logrus.Infof("Starting container [%s] on host [%s], try #%d", containerName, hostname, i)
err = dClient.ContainerStart(ctx, containerName, types.ContainerStartOptions{})
if err != nil {
if strings.Contains(err.Error(), "bind: address already in use") || strings.Contains(err.Error(), "invalid argument") {
return err
}
logrus.Warningf("Can't start Docker container [%s] on host [%s]: %v", containerName, hostname, err)
continue
}
return nil
}
return err
}
func CreateContainer(ctx context.Context, dClient *client.Client, hostname string, containerName string, imageCfg *container.Config, hostCfg *container.HostConfig) (container.ContainerCreateCreatedBody, error) {
if dClient == nil {
return container.ContainerCreateCreatedBody{}, fmt.Errorf("Failed to create container: docker client is nil for container [%s] on host [%s]", containerName, hostname)
}
var created container.ContainerCreateCreatedBody
var err error
// Retry up to RetryCount times to see if image exists
for i := 1; i <= RetryCount; i++ {
created, err = dClient.ContainerCreate(ctx, imageCfg, hostCfg, nil, nil, containerName)
if err != nil {
logrus.Warningf("Failed to create Docker container [%s] on host [%s]: %v", containerName, hostname, err)
continue
}
return created, nil
}
return container.ContainerCreateCreatedBody{}, fmt.Errorf("Failed to create Docker container [%s] on host [%s]: %v", containerName, hostname, err)
}
func InspectContainer(ctx context.Context, dClient *client.Client, hostname string, containerName string) (types.ContainerJSON, error) {
if dClient == nil {
return types.ContainerJSON{}, fmt.Errorf("Failed to inspect container: docker client is nil for container [%s] on host [%s]", containerName, hostname)
}
var inspection types.ContainerJSON
var err error
// Retry up to RetryCount times to see if image exists
for i := 1; i <= RetryCount; i++ {
inspection, err = dClient.ContainerInspect(ctx, containerName)
if err != nil {
if client.IsErrNotFound(err) {
return types.ContainerJSON{}, err
}
logrus.Warningf("Failed to inspect Docker container [%s] on host [%s]: %v", containerName, hostname, err)
continue
}
return inspection, nil
}
return types.ContainerJSON{}, fmt.Errorf("Failed to inspect Docker container [%s] on host [%s]: %v", containerName, hostname, err)
}
func StopRenameContainer(ctx context.Context, dClient *client.Client, hostname string, oldContainerName string, newContainerName string) error {
if dClient == nil {
return fmt.Errorf("Failed to stop and rename container: docker client is nil for container [%s] on host [%s]", oldContainerName, hostname)
}
// make sure we don't have an old old-container from a previous broken update
exists, err := DoesContainerExist(ctx, dClient, hostname, newContainerName, true)
if err != nil {
return err
}
if exists {
if err := RemoveContainer(ctx, dClient, hostname, newContainerName); err != nil {
return err
}
}
if err := StopContainer(ctx, dClient, hostname, oldContainerName); err != nil {
return err
}
if _, err := WaitForContainer(ctx, dClient, hostname, oldContainerName, true); err != nil {
return err
}
return RenameContainer(ctx, dClient, hostname, oldContainerName, newContainerName)
}
func WaitForContainer(ctx context.Context, dClient *client.Client, hostname string, containerName string, noisy bool) (int64, error) {
if dClient == nil {
return 1, fmt.Errorf("Failed waiting for container: docker client is nil for container [%s] on host [%s]", containerName, hostname)
}
// Set containerTimeout value from context or default. Especially for transferring snapshots
containerTimeout := WaitTimeout
if v, ok := ctx.Value(WaitTimeoutContextKey).(int); ok && v > 0 {
containerTimeout = v
}
log.Infof(ctx, "Waiting for [%s] container to exit on host [%s]", containerName, hostname)
var lastStdout, lastStderr string
for retries := 0; retries < containerTimeout; retries++ {
container, err := InspectContainer(ctx, dClient, hostname, containerName)
if err != nil {
return 1, fmt.Errorf("Could not inspect container [%s] on host [%s]: %s", containerName, hostname, err)
}
if container.State.Running {
stderr, stdout, err := GetContainerLogsStdoutStderr(ctx, dClient, containerName, "1", false)
if err != nil {
logrus.Warnf("Failed to get container logs from container [%s] on host [%s]: %v", containerName, hostname, err)
}
if noisy || lastStdout != stdout || lastStderr != stderr {
log.Infof(ctx, "Container [%s] is still running on host [%s]: stderr: [%s], stdout: [%s]", containerName, hostname, stderr, stdout)
lastStdout = stdout
lastStderr = stderr
}
time.Sleep(1 * time.Second)
continue
}
logrus.Debugf("Exit code for [%s] container on host [%s] is [%d]", containerName, hostname, int64(container.State.ExitCode))
return int64(container.State.ExitCode), nil
}
stderr, stdout, err := GetContainerLogsStdoutStderr(ctx, dClient, containerName, "1", false)
if err != nil {
logrus.Warnf("Failed to get container logs from container [%s] on host [%s]", containerName, hostname)
}
return 1, fmt.Errorf("Container [%s] did not exit in time on host [%s]: stderr: [%s], stdout: [%s]", containerName, hostname, stderr, stdout)
}
func IsContainerUpgradable(ctx context.Context, dClient *client.Client, imageCfg *container.Config, hostCfg *container.HostConfig, containerName string, hostname string, plane string) (bool, error) {
if dClient == nil {
return false, fmt.Errorf("[%s] Failed checking if container is upgradable: docker client is nil for container [%s] on host [%s]", plane, containerName, hostname)
}
logrus.Debugf("[%s] Checking if container [%s] is eligible for upgrade on host [%s]", plane, containerName, hostname)
// this should be moved to a higher layer.
containerInspect, err := InspectContainer(ctx, dClient, hostname, containerName)
if err != nil {
return false, err
}
// image inspect to compare the env correctly
imageInspect, _, err := dClient.ImageInspectWithRaw(ctx, imageCfg.Image)
if err != nil {
if !client.IsErrNotFound(err) {
return false, err
}
logrus.Debugf("[%s] Container [%s] is eligible for upgrade on host [%s]", plane, containerName, hostname)
return true, nil
}
if containerInspect.Config.Image != imageCfg.Image ||
!sliceEqualsIgnoreOrder(containerInspect.Config.Entrypoint, imageCfg.Entrypoint) ||
!sliceEqualsIgnoreOrder(containerInspect.Config.Cmd, imageCfg.Cmd) ||
!isContainerEnvChanged(containerInspect.Config.Env, imageCfg.Env, imageInspect.Config.Env) ||
!sliceEqualsIgnoreOrder(containerInspect.HostConfig.Binds, hostCfg.Binds) ||
!securityOptsliceEqualsIgnoreOrder(containerInspect.HostConfig.SecurityOpt, hostCfg.SecurityOpt) {
logrus.Debugf("[%s] Container [%s] is eligible for upgrade on host [%s]", plane, containerName, hostname)
return true, nil
}
logrus.Debugf("[%s] Container [%s] is not eligible for upgrade on host [%s]", plane, containerName, hostname)
return false, nil
}
func sliceEqualsIgnoreOrder(left, right []string) bool {
if equal := sets.NewString(left...).Equal(sets.NewString(right...)); !equal {
logrus.Debugf("slice is not equal, showing data in new value which is not in old value: %v", sets.NewString(right...).Difference(sets.NewString(left...)))
logrus.Debugf("slice is not equal, showing data in old value which is not in new value: %v", sets.NewString(left...).Difference(sets.NewString(right...)))
return false
}
return true
}
func securityOptsliceEqualsIgnoreOrder(left, right []string) bool {
if equal := sets.NewString(left...).Equal(sets.NewString(right...)); !equal {
logrus.Debugf("slice is not equal, showing data in new value which is not in old value: %v", sets.NewString(right...).Difference(sets.NewString(left...)))
diff := sets.NewString(left...).Difference(sets.NewString(right...))
logrus.Debugf("slice is not equal, showing data in old value which is not in new value: %v", diff)
// Docker sets label=disable automatically on all non labeled containers with will result in a false diff between spec and the actual running container
// If the diff matches the disable label exactly, we still report true as being equal
if equal := sets.NewString([]string{"label=disable"}...).Equal(diff); equal {
logrus.Debugf("returning equal as true because diff matches the automatically added disable label for SELinux which can be ignored: %v", diff)
return true
}
return false
}
return true
}
func IsSupportedDockerVersion(info types.Info, K8sVersion string) (bool, error) {
dockerVersion, err := semver.NewVersion(info.ServerVersion)
if err != nil {
return false, err
}
for _, DockerVersion := range metadata.K8sVersionToDockerVersions[K8sVersion] {
supportedDockerVersion, err := convertToSemver(DockerVersion)
if err != nil {
return false, err
}
if dockerVersion.Major == supportedDockerVersion.Major && dockerVersion.Minor == supportedDockerVersion.Minor {
return true, nil
}
}
return false, nil
}
func ReadFileFromContainer(ctx context.Context, dClient *client.Client, hostname, container, filePath string) (string, error) {
if dClient == nil {
return "", fmt.Errorf("Failed reading file from container: docker client is nil for container [%s] on host [%s]", container, hostname)
}
reader, _, err := dClient.CopyFromContainer(ctx, container, filePath)
if err != nil {
return "", fmt.Errorf("Failed to copy file [%s] from container [%s] on host [%s]: %v", filePath, container, hostname, err)
}
defer reader.Close()
tarReader := tar.NewReader(reader)
if _, err := tarReader.Next(); err != nil {
return "", err
}
file, err := io.ReadAll(tarReader)
if err != nil {
return "", err
}
return string(file), nil
}
func ReadContainerLogs(ctx context.Context, dClient *client.Client, containerName string, follow bool, tail string) (io.ReadCloser, error) {
if dClient == nil {
return nil, fmt.Errorf("Failed reading container logs: docker client is nil for container [%s]", containerName)
}
var logs io.ReadCloser
var err error
for i := 1; i <= RetryCount; i++ {
logs, err = dClient.ContainerLogs(ctx, containerName, types.ContainerLogsOptions{Follow: follow, ShowStdout: true, ShowStderr: true, Timestamps: false, Tail: tail})
if err != nil {
logrus.Warnf("Can't read container logs for container [%s]: %v", containerName, err)
continue
}
return logs, nil
}
return nil, err
}
func GetContainerLogsStdoutStderr(ctx context.Context, dClient *client.Client, containerName, tail string, follow bool) (string, string, error) {
if dClient == nil {
return "", "", fmt.Errorf("Failed to get container logs stdout and stderr: docker client is nil for container [%s]", containerName)
}
var containerStderr bytes.Buffer
var containerStdout bytes.Buffer
var containerErrLog, containerStdLog string
clogs, logserr := ReadContainerLogs(ctx, dClient, containerName, follow, tail)
if logserr != nil || clogs == nil {
logrus.Debugf("logserr: %v", logserr)
return containerErrLog, containerStdLog, fmt.Errorf("Failed to get gather logs from container [%s]: %v", containerName, logserr)
}
defer clogs.Close()
stdcopy.StdCopy(&containerStdout, &containerStderr, clogs)
containerErrLog = containerStderr.String()
containerStdLog = containerStdout.String()
return containerErrLog, containerStdLog, nil
}
func tryRegistryAuth(pr v3.PrivateRegistry) types.RequestPrivilegeFunc {
return func() (string, error) {
return getRegistryAuth(pr)
}
}
func getRegistryAuth(pr v3.PrivateRegistry) (string, error) {
var authConfig types.AuthConfig
var err error
if len(pr.User) == 0 && len(pr.Password) == 0 && pr.ECRCredentialPlugin != nil {
authConfig, err = util.ECRCredentialPlugin(pr.ECRCredentialPlugin, pr.URL)
if err != nil {
return "", err
}
} else {
authConfig = types.AuthConfig{
Username: pr.User,
Password: pr.Password,
}
}
encodedJSON, err := json.Marshal(authConfig)
if err != nil {
return "", err
}
return base64.URLEncoding.EncodeToString(encodedJSON), nil
}
func GetImageRegistryConfig(image string, prsMap map[string]v3.PrivateRegistry) (string, string, error) {
/*
Image can be passed as
- Example1: repo.com/foo/bar/rancher/rke-tools:v0.1.51
or
- Example2: repo.com/rancher/rke-tools:v0.1.51 // image2
or
- rancher/rke-tools
Where the repo can be:
- repo.com
or
- repo.com/foo/bar
When checking for the repo presence in prsMap, the following repo will be found:
- Example1: repo.com/foo/bar
- Exmaple2: repo.com
*/
namedImage, err := ref.ParseNormalizedNamed(image)
if err != nil {
return "", "", err
}
if len(prsMap) == 0 {
return "", "", nil
}
regURL := ref.Domain(namedImage)
regPath := ref.Path(namedImage)
splitPath := strings.Split(regPath, "/")
if len(splitPath) > 2 {
splitPath = splitPath[:len(splitPath)-2]
regPath = strings.Join(splitPath, "/")
regURL = fmt.Sprintf("%s/%s", regURL, regPath)
}
if pr, ok := prsMap[regURL]; ok {
logrus.Debugf("Found regURL %v", regURL)
// We do this if we have some docker.io login information
regAuth, err := getRegistryAuth(pr)
return regAuth, pr.URL, err
}
return "", "", nil
}
func convertToSemver(version string) (*semver.Version, error) {
compVersion := strings.SplitN(version, ".", 3)
if len(compVersion) != 3 {
return nil, fmt.Errorf("The default version is not correct")
}
compVersion[2] = "0"
return semver.NewVersion(strings.Join(compVersion, "."))
}
func isContainerEnvChanged(containerEnv, imageConfigEnv, dockerfileEnv []string) bool {
// remove PATH env from the container env
allImageEnv := append(imageConfigEnv, dockerfileEnv...)
return sliceEqualsIgnoreOrder(allImageEnv, containerEnv)
}
func GetKubeletDockerConfig(prsMap map[string]v3.PrivateRegistry) (string, error) {
auths := map[string]authConfig{}
credHelper := make(map[string]string)
for url, pr := range prsMap {
if pr.ECRCredentialPlugin != nil {
credHelper[pr.URL] = "ecr-login"
} else {
auth := base64.StdEncoding.EncodeToString([]byte(fmt.Sprintf("%s:%s", pr.User, pr.Password)))
auths[url] = authConfig{Auth: auth}
}
}
cfg, err := json.Marshal(dockerConfig{auths, credHelper})
if err != nil {
return "", err
}
return string(cfg), nil
}
func DoRestartContainer(ctx context.Context, dClient *client.Client, containerName, hostname string) error {
if dClient == nil {
return fmt.Errorf("Failed to restart container: docker client is nil for container [%s] on host [%s]", containerName, hostname)
}
logrus.Debugf("[restart/%s] Checking if container is running on host [%s]", containerName, hostname)
_, err := InspectContainer(ctx, dClient, hostname, containerName)
if err != nil {
if client.IsErrNotFound(err) {
logrus.Debugf("[restart/%s] Container doesn't exist on host [%s]", containerName, hostname)
return nil
}
return err
}
logrus.Debugf("[restart/%s] Restarting container on host [%s]", containerName, hostname)
err = RestartContainer(ctx, dClient, hostname, containerName)
if err != nil {
return err
}
log.Infof(ctx, "[restart/%s] Successfully restarted container on host [%s]", containerName, hostname)
return nil
}
func GetContainerOutput(ctx context.Context, dClient *client.Client, containerName, hostname string, noisy bool) (int64, string, string, error) {
if dClient == nil {
return 1, "", "", fmt.Errorf("Failed to get container output: docker client is nil for container [%s] on host [%s]", containerName, hostname)
}
status, err := WaitForContainer(ctx, dClient, hostname, containerName, noisy)
if err != nil {
return 1, "", "", err
}
stderr, stdout, err := GetContainerLogsStdoutStderr(ctx, dClient, containerName, "1", false)
if err != nil {
return 1, "", "", err
}
return status, stdout, stderr, nil
}