298 lines
11 KiB
Go
298 lines
11 KiB
Go
package daemon // import "github.com/docker/docker/daemon"
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import (
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"context"
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"encoding/json"
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"fmt"
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"strconv"
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"github.com/containerd/containerd/log"
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"github.com/hashicorp/go-multierror"
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"github.com/mitchellh/copystructure"
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"github.com/docker/docker/daemon/config"
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)
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// reloadTxn is used to defer side effects of a config reload.
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type reloadTxn struct {
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onCommit, onRollback []func() error
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}
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// OnCommit defers a function to be called when a config reload is being finalized.
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// The error returned from cb is purely informational.
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func (tx *reloadTxn) OnCommit(cb func() error) {
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tx.onCommit = append(tx.onCommit, cb)
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}
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// OnRollback defers a function to be called when a config reload is aborted.
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// The error returned from cb is purely informational.
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func (tx *reloadTxn) OnRollback(cb func() error) {
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tx.onCommit = append(tx.onRollback, cb)
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}
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func (tx *reloadTxn) run(cbs []func() error) error {
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tx.onCommit = nil
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tx.onRollback = nil
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var res *multierror.Error
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for _, cb := range cbs {
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res = multierror.Append(res, cb())
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}
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return res.ErrorOrNil()
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}
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// Commit calls all functions registered with OnCommit.
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// Any errors returned by the functions are collated into a
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// *github.com/hashicorp/go-multierror.Error value.
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func (tx *reloadTxn) Commit() error {
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return tx.run(tx.onCommit)
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}
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// Rollback calls all functions registered with OnRollback.
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// Any errors returned by the functions are collated into a
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// *github.com/hashicorp/go-multierror.Error value.
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func (tx *reloadTxn) Rollback() error {
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return tx.run(tx.onRollback)
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}
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// Reload modifies the live daemon configuration from conf.
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// conf is assumed to be a validated configuration.
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//
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// These are the settings that Reload changes:
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// - Platform runtime
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// - Daemon debug log level
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// - Daemon max concurrent downloads
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// - Daemon max concurrent uploads
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// - Daemon max download attempts
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// - Daemon shutdown timeout (in seconds)
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// - Cluster discovery (reconfigure and restart)
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// - Daemon labels
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// - Insecure registries
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// - Registry mirrors
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// - Daemon live restore
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func (daemon *Daemon) Reload(conf *config.Config) error {
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daemon.configReload.Lock()
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defer daemon.configReload.Unlock()
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copied, err := copystructure.Copy(daemon.config().Config)
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if err != nil {
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return err
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}
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newCfg := &configStore{
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Config: copied.(config.Config),
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}
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attributes := map[string]string{}
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// Ideally reloading should be transactional: the reload either completes
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// successfully, or the daemon config and state are left untouched. We use a
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// two-phase commit protocol to achieve this. Any fallible reload operation is
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// split into two phases. The first phase performs all the fallible operations
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// and mutates the newCfg copy. The second phase atomically swaps newCfg into
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// the live daemon configuration and executes any commit functions the first
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// phase registered to apply the side effects. If any first-phase returns an
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// error, the reload transaction is rolled back by discarding newCfg and
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// executing any registered rollback functions.
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var txn reloadTxn
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for _, reload := range []func(txn *reloadTxn, newCfg *configStore, conf *config.Config, attributes map[string]string) error{
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daemon.reloadPlatform,
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daemon.reloadDebug,
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daemon.reloadMaxConcurrentDownloadsAndUploads,
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daemon.reloadMaxDownloadAttempts,
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daemon.reloadShutdownTimeout,
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daemon.reloadFeatures,
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daemon.reloadLabels,
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daemon.reloadRegistryConfig,
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daemon.reloadLiveRestore,
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daemon.reloadNetworkDiagnosticPort,
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} {
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if err := reload(&txn, newCfg, conf, attributes); err != nil {
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if rollbackErr := txn.Rollback(); rollbackErr != nil {
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return multierror.Append(nil, err, rollbackErr)
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}
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return err
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}
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}
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jsonString, _ := json.Marshal(&struct {
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*config.Config
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config.Proxies `json:"proxies"`
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}{
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Config: &newCfg.Config,
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Proxies: config.Proxies{
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HTTPProxy: config.MaskCredentials(newCfg.HTTPProxy),
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HTTPSProxy: config.MaskCredentials(newCfg.HTTPSProxy),
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NoProxy: config.MaskCredentials(newCfg.NoProxy),
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},
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})
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log.G(context.TODO()).Infof("Reloaded configuration: %s", jsonString)
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daemon.configStore.Store(newCfg)
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daemon.LogDaemonEventWithAttributes("reload", attributes)
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return txn.Commit()
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}
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func marshalAttributeSlice(v []string) string {
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if v == nil {
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return "[]"
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}
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b, err := json.Marshal(v)
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if err != nil {
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panic(err) // Should never happen as the input type is fixed.
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}
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return string(b)
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}
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// reloadDebug updates configuration with Debug option
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// and updates the passed attributes
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func (daemon *Daemon) reloadDebug(txn *reloadTxn, newCfg *configStore, conf *config.Config, attributes map[string]string) error {
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// update corresponding configuration
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if conf.IsValueSet("debug") {
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newCfg.Debug = conf.Debug
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}
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// prepare reload event attributes with updatable configurations
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attributes["debug"] = strconv.FormatBool(newCfg.Debug)
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return nil
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}
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// reloadMaxConcurrentDownloadsAndUploads updates configuration with max concurrent
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// download and upload options and updates the passed attributes
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func (daemon *Daemon) reloadMaxConcurrentDownloadsAndUploads(txn *reloadTxn, newCfg *configStore, conf *config.Config, attributes map[string]string) error {
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// We always "reset" as the cost is lightweight and easy to maintain.
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newCfg.MaxConcurrentDownloads = config.DefaultMaxConcurrentDownloads
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newCfg.MaxConcurrentUploads = config.DefaultMaxConcurrentUploads
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if conf.IsValueSet("max-concurrent-downloads") && conf.MaxConcurrentDownloads != 0 {
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newCfg.MaxConcurrentDownloads = conf.MaxConcurrentDownloads
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}
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if conf.IsValueSet("max-concurrent-uploads") && conf.MaxConcurrentUploads != 0 {
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newCfg.MaxConcurrentUploads = conf.MaxConcurrentUploads
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}
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txn.OnCommit(func() error {
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if daemon.imageService != nil {
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daemon.imageService.UpdateConfig(
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newCfg.MaxConcurrentDownloads,
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newCfg.MaxConcurrentUploads,
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)
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}
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return nil
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})
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// prepare reload event attributes with updatable configurations
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attributes["max-concurrent-downloads"] = strconv.Itoa(newCfg.MaxConcurrentDownloads)
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attributes["max-concurrent-uploads"] = strconv.Itoa(newCfg.MaxConcurrentUploads)
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log.G(context.TODO()).Debug("Reset Max Concurrent Downloads: ", attributes["max-concurrent-downloads"])
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log.G(context.TODO()).Debug("Reset Max Concurrent Uploads: ", attributes["max-concurrent-uploads"])
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return nil
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}
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// reloadMaxDownloadAttempts updates configuration with max concurrent
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// download attempts when a connection is lost and updates the passed attributes
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func (daemon *Daemon) reloadMaxDownloadAttempts(txn *reloadTxn, newCfg *configStore, conf *config.Config, attributes map[string]string) error {
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// We always "reset" as the cost is lightweight and easy to maintain.
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newCfg.MaxDownloadAttempts = config.DefaultDownloadAttempts
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if conf.IsValueSet("max-download-attempts") && conf.MaxDownloadAttempts != 0 {
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newCfg.MaxDownloadAttempts = conf.MaxDownloadAttempts
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}
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// prepare reload event attributes with updatable configurations
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attributes["max-download-attempts"] = strconv.Itoa(newCfg.MaxDownloadAttempts)
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log.G(context.TODO()).Debug("Reset Max Download Attempts: ", attributes["max-download-attempts"])
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return nil
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}
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// reloadShutdownTimeout updates configuration with daemon shutdown timeout option
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// and updates the passed attributes
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func (daemon *Daemon) reloadShutdownTimeout(txn *reloadTxn, newCfg *configStore, conf *config.Config, attributes map[string]string) error {
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// update corresponding configuration
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if conf.IsValueSet("shutdown-timeout") {
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newCfg.ShutdownTimeout = conf.ShutdownTimeout
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log.G(context.TODO()).Debugf("Reset Shutdown Timeout: %d", newCfg.ShutdownTimeout)
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}
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// prepare reload event attributes with updatable configurations
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attributes["shutdown-timeout"] = strconv.Itoa(newCfg.ShutdownTimeout)
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return nil
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}
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// reloadLabels updates configuration with engine labels
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// and updates the passed attributes
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func (daemon *Daemon) reloadLabels(txn *reloadTxn, newCfg *configStore, conf *config.Config, attributes map[string]string) error {
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// update corresponding configuration
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if conf.IsValueSet("labels") {
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newCfg.Labels = conf.Labels
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}
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// prepare reload event attributes with updatable configurations
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attributes["labels"] = marshalAttributeSlice(newCfg.Labels)
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return nil
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}
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// reloadRegistryConfig updates the configuration with registry options
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// and updates the passed attributes.
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func (daemon *Daemon) reloadRegistryConfig(txn *reloadTxn, newCfg *configStore, conf *config.Config, attributes map[string]string) error {
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// Update corresponding configuration.
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if conf.IsValueSet("allow-nondistributable-artifacts") {
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newCfg.ServiceOptions.AllowNondistributableArtifacts = conf.AllowNondistributableArtifacts
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}
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if conf.IsValueSet("insecure-registries") {
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newCfg.ServiceOptions.InsecureRegistries = conf.InsecureRegistries
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}
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if conf.IsValueSet("registry-mirrors") {
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newCfg.ServiceOptions.Mirrors = conf.Mirrors
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}
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commit, err := daemon.registryService.ReplaceConfig(newCfg.ServiceOptions)
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if err != nil {
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return err
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}
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txn.OnCommit(func() error { commit(); return nil })
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attributes["allow-nondistributable-artifacts"] = marshalAttributeSlice(newCfg.ServiceOptions.AllowNondistributableArtifacts)
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attributes["insecure-registries"] = marshalAttributeSlice(newCfg.ServiceOptions.InsecureRegistries)
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attributes["registry-mirrors"] = marshalAttributeSlice(newCfg.ServiceOptions.Mirrors)
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return nil
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}
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// reloadLiveRestore updates configuration with live restore option
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// and updates the passed attributes
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func (daemon *Daemon) reloadLiveRestore(txn *reloadTxn, newCfg *configStore, conf *config.Config, attributes map[string]string) error {
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// update corresponding configuration
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if conf.IsValueSet("live-restore") {
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newCfg.LiveRestoreEnabled = conf.LiveRestoreEnabled
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}
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// prepare reload event attributes with updatable configurations
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attributes["live-restore"] = strconv.FormatBool(newCfg.LiveRestoreEnabled)
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return nil
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}
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// reloadNetworkDiagnosticPort updates the network controller starting the diagnostic if the config is valid
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func (daemon *Daemon) reloadNetworkDiagnosticPort(txn *reloadTxn, newCfg *configStore, conf *config.Config, attributes map[string]string) error {
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txn.OnCommit(func() error {
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if conf == nil || daemon.netController == nil || !conf.IsValueSet("network-diagnostic-port") ||
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conf.NetworkDiagnosticPort < 1 || conf.NetworkDiagnosticPort > 65535 {
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// If there is no config make sure that the diagnostic is off
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if daemon.netController != nil {
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daemon.netController.StopDiagnostic()
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}
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return nil
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}
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// Enable the network diagnostic if the flag is set with a valid port within the range
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log.G(context.TODO()).WithFields(log.Fields{"port": conf.NetworkDiagnosticPort, "ip": "127.0.0.1"}).Warn("Starting network diagnostic server")
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daemon.netController.StartDiagnostic(conf.NetworkDiagnosticPort)
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return nil
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})
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return nil
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}
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// reloadFeatures updates configuration with enabled/disabled features
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func (daemon *Daemon) reloadFeatures(txn *reloadTxn, newCfg *configStore, conf *config.Config, attributes map[string]string) error {
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// update corresponding configuration
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// note that we allow features option to be entirely unset
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newCfg.Features = conf.Features
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// prepare reload event attributes with updatable configurations
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attributes["features"] = fmt.Sprintf("%v", newCfg.Features)
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return nil
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}
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