package daemon import ( "bytes" "encoding/json" "fmt" "io" "io/ioutil" "runtime" "strings" "sync" "github.com/Sirupsen/logrus" "github.com/docker/docker/opts" "github.com/docker/docker/pkg/discovery" "github.com/docker/docker/registry" "github.com/imdario/mergo" "github.com/spf13/pflag" ) const ( // defaultMaxConcurrentDownloads is the default value for // maximum number of downloads that // may take place at a time for each pull. defaultMaxConcurrentDownloads = 3 // defaultMaxConcurrentUploads is the default value for // maximum number of uploads that // may take place at a time for each push. defaultMaxConcurrentUploads = 5 // stockRuntimeName is the reserved name/alias used to represent the // OCI runtime being shipped with the docker daemon package. stockRuntimeName = "runc" ) const ( defaultNetworkMtu = 1500 disableNetworkBridge = "none" ) // flatOptions contains configuration keys // that MUST NOT be parsed as deep structures. // Use this to differentiate these options // with others like the ones in CommonTLSOptions. var flatOptions = map[string]bool{ "cluster-store-opts": true, "log-opts": true, "runtimes": true, } // LogConfig represents the default log configuration. // It includes json tags to deserialize configuration from a file // using the same names that the flags in the command line use. type LogConfig struct { Type string `json:"log-driver,omitempty"` Config map[string]string `json:"log-opts,omitempty"` } // commonBridgeConfig stores all the platform-common bridge driver specific // configuration. type commonBridgeConfig struct { Iface string `json:"bridge,omitempty"` FixedCIDR string `json:"fixed-cidr,omitempty"` } // CommonTLSOptions defines TLS configuration for the daemon server. // It includes json tags to deserialize configuration from a file // using the same names that the flags in the command line use. type CommonTLSOptions struct { CAFile string `json:"tlscacert,omitempty"` CertFile string `json:"tlscert,omitempty"` KeyFile string `json:"tlskey,omitempty"` } // CommonConfig defines the configuration of a docker daemon which is // common across platforms. // It includes json tags to deserialize configuration from a file // using the same names that the flags in the command line use. type CommonConfig struct { AuthorizationPlugins []string `json:"authorization-plugins,omitempty"` // AuthorizationPlugins holds list of authorization plugins AutoRestart bool `json:"-"` Context map[string][]string `json:"-"` DisableBridge bool `json:"-"` DNS []string `json:"dns,omitempty"` DNSOptions []string `json:"dns-opts,omitempty"` DNSSearch []string `json:"dns-search,omitempty"` ExecOptions []string `json:"exec-opts,omitempty"` GraphDriver string `json:"storage-driver,omitempty"` GraphOptions []string `json:"storage-opts,omitempty"` Labels []string `json:"labels,omitempty"` Mtu int `json:"mtu,omitempty"` Pidfile string `json:"pidfile,omitempty"` RawLogs bool `json:"raw-logs,omitempty"` Root string `json:"graph,omitempty"` SocketGroup string `json:"group,omitempty"` TrustKeyPath string `json:"-"` CorsHeaders string `json:"api-cors-header,omitempty"` EnableCors bool `json:"api-enable-cors,omitempty"` // LiveRestoreEnabled determines whether we should keep containers // alive upon daemon shutdown/start LiveRestoreEnabled bool `json:"live-restore,omitempty"` // ClusterStore is the storage backend used for the cluster information. It is used by both // multihost networking (to store networks and endpoints information) and by the node discovery // mechanism. ClusterStore string `json:"cluster-store,omitempty"` // ClusterOpts is used to pass options to the discovery package for tuning libkv settings, such // as TLS configuration settings. ClusterOpts map[string]string `json:"cluster-store-opts,omitempty"` // ClusterAdvertise is the network endpoint that the Engine advertises for the purpose of node // discovery. This should be a 'host:port' combination on which that daemon instance is // reachable by other hosts. ClusterAdvertise string `json:"cluster-advertise,omitempty"` // MaxConcurrentDownloads is the maximum number of downloads that // may take place at a time for each pull. MaxConcurrentDownloads *int `json:"max-concurrent-downloads,omitempty"` // MaxConcurrentUploads is the maximum number of uploads that // may take place at a time for each push. MaxConcurrentUploads *int `json:"max-concurrent-uploads,omitempty"` Debug bool `json:"debug,omitempty"` Hosts []string `json:"hosts,omitempty"` LogLevel string `json:"log-level,omitempty"` TLS bool `json:"tls,omitempty"` TLSVerify bool `json:"tlsverify,omitempty"` // Embedded structs that allow config // deserialization without the full struct. CommonTLSOptions // SwarmDefaultAdvertiseAddr is the default host/IP or network interface // to use if a wildcard address is specified in the ListenAddr value // given to the /swarm/init endpoint and no advertise address is // specified. SwarmDefaultAdvertiseAddr string `json:"swarm-default-advertise-addr"` LogConfig bridgeConfig // bridgeConfig holds bridge network specific configuration. registry.ServiceOptions reloadLock sync.Mutex valuesSet map[string]interface{} } // InstallCommonFlags adds flags to the pflag.FlagSet to configure the daemon func (config *Config) InstallCommonFlags(flags *pflag.FlagSet) { var maxConcurrentDownloads, maxConcurrentUploads int config.ServiceOptions.InstallCliFlags(flags) flags.Var(opts.NewNamedListOptsRef("storage-opts", &config.GraphOptions, nil), "storage-opt", "Storage driver options") flags.Var(opts.NewNamedListOptsRef("authorization-plugins", &config.AuthorizationPlugins, nil), "authorization-plugin", "Authorization plugins to load") flags.Var(opts.NewNamedListOptsRef("exec-opts", &config.ExecOptions, nil), "exec-opt", "Runtime execution options") flags.StringVarP(&config.Pidfile, "pidfile", "p", defaultPidFile, "Path to use for daemon PID file") flags.StringVarP(&config.Root, "graph", "g", defaultGraph, "Root of the Docker runtime") flags.BoolVarP(&config.AutoRestart, "restart", "r", true, "--restart on the daemon has been deprecated in favor of --restart policies on docker run") flags.MarkDeprecated("restart", "Please use a restart policy on docker run") flags.StringVarP(&config.GraphDriver, "storage-driver", "s", "", "Storage driver to use") flags.IntVar(&config.Mtu, "mtu", 0, "Set the containers network MTU") flags.BoolVar(&config.RawLogs, "raw-logs", false, "Full timestamps without ANSI coloring") // FIXME: why the inconsistency between "hosts" and "sockets"? flags.Var(opts.NewListOptsRef(&config.DNS, opts.ValidateIPAddress), "dns", "DNS server to use") flags.Var(opts.NewNamedListOptsRef("dns-opts", &config.DNSOptions, nil), "dns-opt", "DNS options to use") flags.Var(opts.NewListOptsRef(&config.DNSSearch, opts.ValidateDNSSearch), "dns-search", "DNS search domains to use") flags.Var(opts.NewNamedListOptsRef("labels", &config.Labels, opts.ValidateLabel), "label", "Set key=value labels to the daemon") flags.StringVar(&config.LogConfig.Type, "log-driver", "json-file", "Default driver for container logs") flags.Var(opts.NewNamedMapOpts("log-opts", config.LogConfig.Config, nil), "log-opt", "Default log driver options for containers") flags.StringVar(&config.ClusterAdvertise, "cluster-advertise", "", "Address or interface name to advertise") flags.StringVar(&config.ClusterStore, "cluster-store", "", "URL of the distributed storage backend") flags.Var(opts.NewNamedMapOpts("cluster-store-opts", config.ClusterOpts, nil), "cluster-store-opt", "Set cluster store options") flags.StringVar(&config.CorsHeaders, "api-cors-header", "", "Set CORS headers in the remote API") flags.IntVar(&maxConcurrentDownloads, "max-concurrent-downloads", defaultMaxConcurrentDownloads, "Set the max concurrent downloads for each pull") flags.IntVar(&maxConcurrentUploads, "max-concurrent-uploads", defaultMaxConcurrentUploads, "Set the max concurrent uploads for each push") flags.StringVar(&config.SwarmDefaultAdvertiseAddr, "swarm-default-advertise-addr", "", "Set default address or interface for swarm advertised address") config.MaxConcurrentDownloads = &maxConcurrentDownloads config.MaxConcurrentUploads = &maxConcurrentUploads } // IsValueSet returns true if a configuration value // was explicitly set in the configuration file. func (config *Config) IsValueSet(name string) bool { if config.valuesSet == nil { return false } _, ok := config.valuesSet[name] return ok } // NewConfig returns a new fully initialized Config struct func NewConfig() *Config { config := Config{} config.LogConfig.Config = make(map[string]string) config.ClusterOpts = make(map[string]string) if runtime.GOOS != "linux" { config.V2Only = true } return &config } func parseClusterAdvertiseSettings(clusterStore, clusterAdvertise string) (string, error) { if clusterAdvertise == "" { return "", errDiscoveryDisabled } if clusterStore == "" { return "", fmt.Errorf("invalid cluster configuration. --cluster-advertise must be accompanied by --cluster-store configuration") } advertise, err := discovery.ParseAdvertise(clusterAdvertise) if err != nil { return "", fmt.Errorf("discovery advertise parsing failed (%v)", err) } return advertise, nil } // ReloadConfiguration reads the configuration in the host and reloads the daemon and server. func ReloadConfiguration(configFile string, flags *pflag.FlagSet, reload func(*Config)) error { logrus.Infof("Got signal to reload configuration, reloading from: %s", configFile) newConfig, err := getConflictFreeConfiguration(configFile, flags) if err != nil { return err } if err := ValidateConfiguration(newConfig); err != nil { return fmt.Errorf("file configuration validation failed (%v)", err) } reload(newConfig) return nil } // boolValue is an interface that boolean value flags implement // to tell the command line how to make -name equivalent to -name=true. type boolValue interface { IsBoolFlag() bool } // MergeDaemonConfigurations reads a configuration file, // loads the file configuration in an isolated structure, // and merges the configuration provided from flags on top // if there are no conflicts. func MergeDaemonConfigurations(flagsConfig *Config, flags *pflag.FlagSet, configFile string) (*Config, error) { fileConfig, err := getConflictFreeConfiguration(configFile, flags) if err != nil { return nil, err } if err := ValidateConfiguration(fileConfig); err != nil { return nil, fmt.Errorf("file configuration validation failed (%v)", err) } // merge flags configuration on top of the file configuration if err := mergo.Merge(fileConfig, flagsConfig); err != nil { return nil, err } // We need to validate again once both fileConfig and flagsConfig // have been merged if err := ValidateConfiguration(fileConfig); err != nil { return nil, fmt.Errorf("file configuration validation failed (%v)", err) } return fileConfig, nil } // getConflictFreeConfiguration loads the configuration from a JSON file. // It compares that configuration with the one provided by the flags, // and returns an error if there are conflicts. func getConflictFreeConfiguration(configFile string, flags *pflag.FlagSet) (*Config, error) { b, err := ioutil.ReadFile(configFile) if err != nil { return nil, err } var config Config var reader io.Reader if flags != nil { var jsonConfig map[string]interface{} reader = bytes.NewReader(b) if err := json.NewDecoder(reader).Decode(&jsonConfig); err != nil { return nil, err } configSet := configValuesSet(jsonConfig) if err := findConfigurationConflicts(configSet, flags); err != nil { return nil, err } // Override flag values to make sure the values set in the config file with nullable values, like `false`, // are not overridden by default truthy values from the flags that were not explicitly set. // See https://github.com/docker/docker/issues/20289 for an example. // // TODO: Rewrite configuration logic to avoid same issue with other nullable values, like numbers. namedOptions := make(map[string]interface{}) for key, value := range configSet { f := flags.Lookup(key) if f == nil { // ignore named flags that don't match namedOptions[key] = value continue } if _, ok := f.Value.(boolValue); ok { f.Value.Set(fmt.Sprintf("%v", value)) } } if len(namedOptions) > 0 { // set also default for mergeVal flags that are boolValue at the same time. flags.VisitAll(func(f *pflag.Flag) { if opt, named := f.Value.(opts.NamedOption); named { v, set := namedOptions[opt.Name()] _, boolean := f.Value.(boolValue) if set && boolean { f.Value.Set(fmt.Sprintf("%v", v)) } } }) } config.valuesSet = configSet } reader = bytes.NewReader(b) err = json.NewDecoder(reader).Decode(&config) return &config, err } // configValuesSet returns the configuration values explicitly set in the file. func configValuesSet(config map[string]interface{}) map[string]interface{} { flatten := make(map[string]interface{}) for k, v := range config { if m, isMap := v.(map[string]interface{}); isMap && !flatOptions[k] { for km, vm := range m { flatten[km] = vm } continue } flatten[k] = v } return flatten } // findConfigurationConflicts iterates over the provided flags searching for // duplicated configurations and unknown keys. It returns an error with all the conflicts if // it finds any. func findConfigurationConflicts(config map[string]interface{}, flags *pflag.FlagSet) error { // 1. Search keys from the file that we don't recognize as flags. unknownKeys := make(map[string]interface{}) for key, value := range config { if flag := flags.Lookup(key); flag == nil { unknownKeys[key] = value } } // 2. Discard values that implement NamedOption. // Their configuration name differs from their flag name, like `labels` and `label`. if len(unknownKeys) > 0 { unknownNamedConflicts := func(f *pflag.Flag) { if namedOption, ok := f.Value.(opts.NamedOption); ok { if _, valid := unknownKeys[namedOption.Name()]; valid { delete(unknownKeys, namedOption.Name()) } } } flags.VisitAll(unknownNamedConflicts) } if len(unknownKeys) > 0 { var unknown []string for key := range unknownKeys { unknown = append(unknown, key) } return fmt.Errorf("the following directives don't match any configuration option: %s", strings.Join(unknown, ", ")) } var conflicts []string printConflict := func(name string, flagValue, fileValue interface{}) string { return fmt.Sprintf("%s: (from flag: %v, from file: %v)", name, flagValue, fileValue) } // 3. Search keys that are present as a flag and as a file option. duplicatedConflicts := func(f *pflag.Flag) { // search option name in the json configuration payload if the value is a named option if namedOption, ok := f.Value.(opts.NamedOption); ok { if optsValue, ok := config[namedOption.Name()]; ok { conflicts = append(conflicts, printConflict(namedOption.Name(), f.Value.String(), optsValue)) } } else { // search flag name in the json configuration payload for _, name := range []string{f.Name, f.Shorthand} { if value, ok := config[name]; ok { conflicts = append(conflicts, printConflict(name, f.Value.String(), value)) break } } } } flags.Visit(duplicatedConflicts) if len(conflicts) > 0 { return fmt.Errorf("the following directives are specified both as a flag and in the configuration file: %s", strings.Join(conflicts, ", ")) } return nil } // ValidateConfiguration validates some specific configs. // such as config.DNS, config.Labels, config.DNSSearch, // as well as config.MaxConcurrentDownloads, config.MaxConcurrentUploads. func ValidateConfiguration(config *Config) error { // validate DNS for _, dns := range config.DNS { if _, err := opts.ValidateIPAddress(dns); err != nil { return err } } // validate DNSSearch for _, dnsSearch := range config.DNSSearch { if _, err := opts.ValidateDNSSearch(dnsSearch); err != nil { return err } } // validate Labels for _, label := range config.Labels { if _, err := opts.ValidateLabel(label); err != nil { return err } } // validate MaxConcurrentDownloads if config.IsValueSet("max-concurrent-downloads") && config.MaxConcurrentDownloads != nil && *config.MaxConcurrentDownloads < 0 { return fmt.Errorf("invalid max concurrent downloads: %d", *config.MaxConcurrentDownloads) } // validate MaxConcurrentUploads if config.IsValueSet("max-concurrent-uploads") && config.MaxConcurrentUploads != nil && *config.MaxConcurrentUploads < 0 { return fmt.Errorf("invalid max concurrent uploads: %d", *config.MaxConcurrentUploads) } // validate that "default" runtime is not reset if runtimes := config.GetAllRuntimes(); len(runtimes) > 0 { if _, ok := runtimes[stockRuntimeName]; ok { return fmt.Errorf("runtime name '%s' is reserved", stockRuntimeName) } } if defaultRuntime := config.GetDefaultRuntimeName(); defaultRuntime != "" && defaultRuntime != stockRuntimeName { runtimes := config.GetAllRuntimes() if _, ok := runtimes[defaultRuntime]; !ok { return fmt.Errorf("specified default runtime '%s' does not exist", defaultRuntime) } } return nil }