package config // import "github.com/docker/docker/daemon/config" import ( "bytes" "encoding/json" "fmt" "io" "io/ioutil" "os" "reflect" "runtime" "strings" "sync" daemondiscovery "github.com/docker/docker/daemon/discovery" "github.com/docker/docker/opts" "github.com/docker/docker/pkg/authorization" "github.com/docker/docker/pkg/discovery" "github.com/docker/docker/registry" "github.com/imdario/mergo" "github.com/pkg/errors" "github.com/sirupsen/logrus" "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" // DefaultShmSize is the default value for container's shm size DefaultShmSize = int64(67108864) // DefaultNetworkMtu is the default value for network MTU DefaultNetworkMtu = 1500 // DisableNetworkBridge is the default value of the option to disable network bridge DisableNetworkBridge = "none" // DefaultInitBinary is the name of the default init binary DefaultInitBinary = "docker-init" ) // 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, "default-ulimits": true, "features": true, "builder": true, } // skipValidateOptions contains configuration keys // that will be skipped from findConfigurationConflicts // for unknown flag validation. var skipValidateOptions = map[string]bool{ "features": true, "builder": true, } // skipDuplicates contains configuration keys that // will be skipped when checking duplicated // configuration field defined in both daemon // config file and from dockerd cli flags. // This allows some configurations to be merged // during the parsing. var skipDuplicates = map[string]bool{ "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"` } // NetworkConfig stores the daemon-wide networking configurations type NetworkConfig struct { // Default address pools for docker networks DefaultAddressPools opts.PoolsOpt `json:"default-address-pools,omitempty"` // NetworkControlPlaneMTU allows to specify the control plane MTU, this will allow to optimize the network use in some components NetworkControlPlaneMTU int `json:"network-control-plane-mtu,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 { AuthzMiddleware *authorization.Middleware `json:"-"` 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"` NetworkDiagnosticPort int `json:"network-diagnostic-port,omitempty"` Pidfile string `json:"pidfile,omitempty"` RawLogs bool `json:"raw-logs,omitempty"` RootDeprecated string `json:"graph,omitempty"` Root string `json:"data-root,omitempty"` ExecRoot string `json:"exec-root,omitempty"` SocketGroup string `json:"group,omitempty"` CorsHeaders string `json:"api-cors-header,omitempty"` // TrustKeyPath is used to generate the daemon ID and for signing schema 1 manifests // when pushing to a registry which does not support schema 2. This field is marked as // deprecated because schema 1 manifests are deprecated in favor of schema 2 and the // daemon ID will use a dedicated identifier not shared with exported signatures. TrustKeyPath string `json:"deprecated-key-path,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"` // ShutdownTimeout is the timeout value (in seconds) the daemon will wait for the container // to stop when daemon is being shutdown ShutdownTimeout int `json:"shutdown-timeout,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"` // SwarmRaftHeartbeatTick is the number of ticks in time for swarm mode raft quorum heartbeat // Typical value is 1 SwarmRaftHeartbeatTick uint32 `json:"swarm-raft-heartbeat-tick"` // SwarmRaftElectionTick is the number of ticks to elapse before followers in the quorum can propose // a new round of leader election. Default, recommended value is at least 10X that of Heartbeat tick. // Higher values can make the quorum less sensitive to transient faults in the environment, but this also // means it takes longer for the managers to detect a down leader. SwarmRaftElectionTick uint32 `json:"swarm-raft-election-tick"` MetricsAddress string `json:"metrics-addr"` LogConfig BridgeConfig // bridgeConfig holds bridge network specific configuration. NetworkConfig registry.ServiceOptions sync.Mutex // FIXME(vdemeester) This part is not that clear and is mainly dependent on cli flags // It should probably be handled outside this package. ValuesSet map[string]interface{} `json:"-"` Experimental bool `json:"experimental"` // Experimental indicates whether experimental features should be exposed or not // Exposed node Generic Resources // e.g: ["orange=red", "orange=green", "orange=blue", "apple=3"] NodeGenericResources []string `json:"node-generic-resources,omitempty"` // ContainerAddr is the address used to connect to containerd if we're // not starting it ourselves ContainerdAddr string `json:"containerd,omitempty"` // CriContainerd determines whether a supervised containerd instance // should be configured with the CRI plugin enabled. This allows using // Docker's containerd instance directly with a Kubernetes kubelet. CriContainerd bool `json:"cri-containerd,omitempty"` // Features contains a list of feature key value pairs indicating what features are enabled or disabled. // If a certain feature doesn't appear in this list then it's unset (i.e. neither true nor false). Features map[string]bool `json:"features,omitempty"` Builder BuilderConfig `json:"builder,omitempty"` } // IsValueSet returns true if a configuration value // was explicitly set in the configuration file. func (conf *Config) IsValueSet(name string) bool { if conf.ValuesSet == nil { return false } _, ok := conf.ValuesSet[name] return ok } // New returns a new fully initialized Config struct func New() *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 } // ParseClusterAdvertiseSettings parses the specified advertise settings func ParseClusterAdvertiseSettings(clusterStore, clusterAdvertise string) (string, error) { if clusterAdvertise == "" { return "", daemondiscovery.ErrDiscoveryDisabled } if clusterStore == "" { return "", errors.New("invalid cluster configuration. --cluster-advertise must be accompanied by --cluster-store configuration") } advertise, err := discovery.ParseAdvertise(clusterAdvertise) if err != nil { return "", errors.Wrap(err, "discovery advertise parsing failed") } return advertise, nil } // GetConflictFreeLabels validates Labels for conflict // In swarm the duplicates for labels are removed // so we only take same values here, no conflict values // If the key-value is the same we will only take the last label func GetConflictFreeLabels(labels []string) ([]string, error) { labelMap := map[string]string{} for _, label := range labels { stringSlice := strings.SplitN(label, "=", 2) if len(stringSlice) > 1 { // If there is a conflict we will return an error if v, ok := labelMap[stringSlice[0]]; ok && v != stringSlice[1] { return nil, fmt.Errorf("conflict labels for %s=%s and %s=%s", stringSlice[0], stringSlice[1], stringSlice[0], v) } labelMap[stringSlice[0]] = stringSlice[1] } } newLabels := []string{} for k, v := range labelMap { newLabels = append(newLabels, fmt.Sprintf("%s=%s", k, v)) } return newLabels, nil } // ValidateReservedNamespaceLabels errors if the reserved namespaces com.docker.*, // io.docker.*, org.dockerproject.* are used in a configured engine label. // // TODO: This is a separate function because we need to warn users first of the // deprecation. When we return an error, this logic can be added to Validate // or GetConflictFreeLabels instead of being here. func ValidateReservedNamespaceLabels(labels []string) error { for _, label := range labels { lowered := strings.ToLower(label) if strings.HasPrefix(lowered, "com.docker.") || strings.HasPrefix(lowered, "io.docker.") || strings.HasPrefix(lowered, "org.dockerproject.") { return fmt.Errorf( "label %s not allowed: the namespaces com.docker.*, io.docker.*, and org.dockerproject.* are reserved for Docker's internal use", label) } } return nil } // Reload reads the configuration in the host and reloads the daemon and server. func Reload(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 { if flags.Changed("config-file") || !os.IsNotExist(err) { return errors.Wrapf(err, "unable to configure the Docker daemon with file %s", configFile) } newConfig = New() } if err := Validate(newConfig); err != nil { return errors.Wrap(err, "file configuration validation failed") } // Check if duplicate label-keys with different values are found newLabels, err := GetConflictFreeLabels(newConfig.Labels) if err != nil { return err } newConfig.Labels = newLabels 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 := Validate(fileConfig); err != nil { return nil, errors.Wrap(err, "configuration validation from file failed") } // 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 := Validate(fileConfig); err != nil { return nil, errors.Wrap(err, "merged configuration validation from file and command line flags failed") } 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) if err := json.NewDecoder(reader).Decode(&config); err != nil { return nil, err } if config.RootDeprecated != "" { logrus.Warn(`The "graph" config file option is deprecated. Please use "data-root" instead.`) if config.Root != "" { return nil, errors.New(`cannot specify both "graph" and "data-root" config file options`) } config.Root = config.RootDeprecated } return &config, nil } // 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 && !skipValidateOptions[key] { 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 && !skipDuplicates[namedOption.Name()] { 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 && !skipDuplicates[name] { 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 } // Validate validates some specific configs. // such as config.DNS, config.Labels, config.DNSSearch, // as well as config.MaxConcurrentDownloads, config.MaxConcurrentUploads. func Validate(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.MaxConcurrentDownloads != nil && *config.MaxConcurrentDownloads < 0 { return fmt.Errorf("invalid max concurrent downloads: %d", *config.MaxConcurrentDownloads) } // validate MaxConcurrentUploads if 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 _, err := ParseGenericResources(config.NodeGenericResources); err != nil { return err } 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) } } // validate platform-specific settings return config.ValidatePlatformConfig() } // ModifiedDiscoverySettings returns whether the discovery configuration has been modified or not. func ModifiedDiscoverySettings(config *Config, backendType, advertise string, clusterOpts map[string]string) bool { if config.ClusterStore != backendType || config.ClusterAdvertise != advertise { return true } if (config.ClusterOpts == nil && clusterOpts == nil) || (config.ClusterOpts == nil && len(clusterOpts) == 0) || (len(config.ClusterOpts) == 0 && clusterOpts == nil) { return false } return !reflect.DeepEqual(config.ClusterOpts, clusterOpts) }