package daemon import ( "net" "github.com/docker/docker/daemon/networkdriver" "github.com/docker/docker/opts" flag "github.com/docker/docker/pkg/mflag" ) const ( defaultNetworkMtu = 1500 disableNetworkBridge = "none" ) // Config define the configuration of a docker daemon // These are the configuration settings that you pass // to the docker daemon when you launch it with say: `docker -d -e lxc` // FIXME: separate runtime configuration from http api configuration type Config struct { Pidfile string Root string AutoRestart bool Dns []string DnsSearch []string Mirrors []string EnableIptables bool EnableIpForward bool EnableIpMasq bool DefaultIp net.IP BridgeIface string BridgeIP string FixedCIDR string InterContainerCommunication bool GraphDriver string GraphOptions []string ExecDriver string Mtu int DisableNetwork bool EnableSelinuxSupport bool Context map[string][]string } // InstallFlags adds command-line options to the top-level flag parser for // the current process. // Subsequent calls to `flag.Parse` will populate config with values parsed // from the command-line. func (config *Config) InstallFlags() { flag.StringVar(&config.Pidfile, []string{"p", "-pidfile"}, "/var/run/docker.pid", "Path to use for daemon PID file") flag.StringVar(&config.Root, []string{"g", "-graph"}, "/var/lib/docker", "Path to use as the root of the Docker runtime") flag.BoolVar(&config.AutoRestart, []string{"#r", "#-restart"}, true, "--restart on the daemon has been deprecated in favor of --restart policies on docker run") flag.BoolVar(&config.EnableIptables, []string{"#iptables", "-iptables"}, true, "Enable Docker's addition of iptables rules") flag.BoolVar(&config.EnableIpForward, []string{"#ip-forward", "-ip-forward"}, true, "Enable net.ipv4.ip_forward") flag.BoolVar(&config.EnableIpMasq, []string{"-ip-masq"}, true, "Enable IP masquerading for bridge's IP range") flag.StringVar(&config.BridgeIP, []string{"#bip", "-bip"}, "", "Use this CIDR notation address for the network bridge's IP, not compatible with -b") flag.StringVar(&config.BridgeIface, []string{"b", "-bridge"}, "", "Attach containers to a pre-existing network bridge\nuse 'none' to disable container networking") flag.StringVar(&config.FixedCIDR, []string{"-fixed-cidr"}, "", "IPv4 subnet for fixed IPs (ex: 10.20.0.0/16)\nthis subnet must be nested in the bridge subnet (which is defined by -b or --bip)") flag.BoolVar(&config.InterContainerCommunication, []string{"#icc", "-icc"}, true, "Enable inter-container communication") flag.StringVar(&config.GraphDriver, []string{"s", "-storage-driver"}, "", "Force the Docker runtime to use a specific storage driver") flag.StringVar(&config.ExecDriver, []string{"e", "-exec-driver"}, "native", "Force the Docker runtime to use a specific exec driver") flag.BoolVar(&config.EnableSelinuxSupport, []string{"-selinux-enabled"}, false, "Enable selinux support. SELinux does not presently support the BTRFS storage driver") flag.IntVar(&config.Mtu, []string{"#mtu", "-mtu"}, 0, "Set the containers network MTU\nif no value is provided: default to the default route MTU or 1500 if no default route is available") opts.IPVar(&config.DefaultIp, []string{"#ip", "-ip"}, "0.0.0.0", "Default IP address to use when binding container ports") opts.ListVar(&config.GraphOptions, []string{"-storage-opt"}, "Set storage driver options") // FIXME: why the inconsistency between "hosts" and "sockets"? opts.IPListVar(&config.Dns, []string{"#dns", "-dns"}, "Force Docker to use specific DNS servers") opts.DnsSearchListVar(&config.DnsSearch, []string{"-dns-search"}, "Force Docker to use specific DNS search domains") opts.MirrorListVar(&config.Mirrors, []string{"-registry-mirror"}, "Specify a preferred Docker registry mirror") } func GetDefaultNetworkMtu() int { if iface, err := networkdriver.GetDefaultRouteIface(); err == nil { return iface.MTU } return defaultNetworkMtu }