github.com/kaisenlinux/docker.io@v0.0.0-20230510090727-ea55db55fac7/engine/cmd/dockerd/config_unix.go (about)

     1  //go:build linux || freebsd
     2  // +build linux freebsd
     3  
     4  package main
     5  
     6  import (
     7  	"os/exec"
     8  
     9  	"github.com/containerd/cgroups"
    10  	"github.com/docker/docker/daemon/config"
    11  	"github.com/docker/docker/opts"
    12  	"github.com/docker/docker/rootless"
    13  	units "github.com/docker/go-units"
    14  	"github.com/pkg/errors"
    15  	"github.com/spf13/pflag"
    16  )
    17  
    18  // installConfigFlags adds flags to the pflag.FlagSet to configure the daemon
    19  func installConfigFlags(conf *config.Config, flags *pflag.FlagSet) error {
    20  	// First handle install flags which are consistent cross-platform
    21  	if err := installCommonConfigFlags(conf, flags); err != nil {
    22  		return err
    23  	}
    24  
    25  	// Then install flags common to unix platforms
    26  	installUnixConfigFlags(conf, flags)
    27  
    28  	conf.Ulimits = make(map[string]*units.Ulimit)
    29  	conf.NetworkConfig.DefaultAddressPools = opts.PoolsOpt{}
    30  
    31  	// Set default value for `--default-shm-size`
    32  	conf.ShmSize = opts.MemBytes(config.DefaultShmSize)
    33  
    34  	// Then platform-specific install flags
    35  	flags.BoolVar(&conf.EnableSelinuxSupport, "selinux-enabled", false, "Enable selinux support")
    36  	flags.Var(opts.NewNamedUlimitOpt("default-ulimits", &conf.Ulimits), "default-ulimit", "Default ulimits for containers")
    37  	flags.BoolVar(&conf.BridgeConfig.EnableIPTables, "iptables", true, "Enable addition of iptables rules")
    38  	flags.BoolVar(&conf.BridgeConfig.EnableIP6Tables, "ip6tables", false, "Enable addition of ip6tables rules")
    39  	flags.BoolVar(&conf.BridgeConfig.EnableIPForward, "ip-forward", true, "Enable net.ipv4.ip_forward")
    40  	flags.BoolVar(&conf.BridgeConfig.EnableIPMasq, "ip-masq", true, "Enable IP masquerading")
    41  	flags.BoolVar(&conf.BridgeConfig.EnableIPv6, "ipv6", false, "Enable IPv6 networking")
    42  	flags.StringVar(&conf.BridgeConfig.FixedCIDRv6, "fixed-cidr-v6", "", "IPv6 subnet for fixed IPs")
    43  	flags.BoolVar(&conf.BridgeConfig.EnableUserlandProxy, "userland-proxy", true, "Use userland proxy for loopback traffic")
    44  	defaultUserlandProxyPath := ""
    45  	if rootless.RunningWithRootlessKit() {
    46  		var err error
    47  		// use rootlesskit-docker-proxy for exposing the ports in RootlessKit netns to the initial namespace.
    48  		defaultUserlandProxyPath, err = exec.LookPath(rootless.RootlessKitDockerProxyBinary)
    49  		if err != nil {
    50  			return errors.Wrapf(err, "running with RootlessKit, but %s not installed", rootless.RootlessKitDockerProxyBinary)
    51  		}
    52  	}
    53  	flags.StringVar(&conf.BridgeConfig.UserlandProxyPath, "userland-proxy-path", defaultUserlandProxyPath, "Path to the userland proxy binary")
    54  	flags.StringVar(&conf.CgroupParent, "cgroup-parent", "", "Set parent cgroup for all containers")
    55  	flags.StringVar(&conf.RemappedRoot, "userns-remap", "", "User/Group setting for user namespaces")
    56  	flags.BoolVar(&conf.LiveRestoreEnabled, "live-restore", false, "Enable live restore of docker when containers are still running")
    57  	flags.IntVar(&conf.OOMScoreAdjust, "oom-score-adjust", 0, "Set the oom_score_adj for the daemon")
    58  	flags.BoolVar(&conf.Init, "init", false, "Run an init in the container to forward signals and reap processes")
    59  	flags.StringVar(&conf.InitPath, "init-path", "", "Path to the docker-init binary")
    60  	flags.Int64Var(&conf.CPURealtimePeriod, "cpu-rt-period", 0, "Limit the CPU real-time period in microseconds for the parent cgroup for all containers")
    61  	flags.Int64Var(&conf.CPURealtimeRuntime, "cpu-rt-runtime", 0, "Limit the CPU real-time runtime in microseconds for the parent cgroup for all containers")
    62  	flags.StringVar(&conf.SeccompProfile, "seccomp-profile", "", "Path to seccomp profile")
    63  	flags.Var(&conf.ShmSize, "default-shm-size", "Default shm size for containers")
    64  	flags.BoolVar(&conf.NoNewPrivileges, "no-new-privileges", false, "Set no-new-privileges by default for new containers")
    65  	flags.StringVar(&conf.IpcMode, "default-ipc-mode", config.DefaultIpcMode, `Default mode for containers ipc ("shareable" | "private")`)
    66  	flags.Var(&conf.NetworkConfig.DefaultAddressPools, "default-address-pool", "Default address pools for node specific local networks")
    67  	// rootless needs to be explicitly specified for running "rootful" dockerd in rootless dockerd (#38702)
    68  	// Note that defaultUserlandProxyPath and honorXDG are configured according to the value of rootless.RunningWithRootlessKit, not the value of --rootless.
    69  	flags.BoolVar(&conf.Rootless, "rootless", rootless.RunningWithRootlessKit(), "Enable rootless mode; typically used with RootlessKit")
    70  	defaultCgroupNamespaceMode := "host"
    71  	if cgroups.Mode() == cgroups.Unified {
    72  		defaultCgroupNamespaceMode = "private"
    73  	}
    74  	flags.StringVar(&conf.CgroupNamespaceMode, "default-cgroupns-mode", defaultCgroupNamespaceMode, `Default mode for containers cgroup namespace ("host" | "private")`)
    75  	return nil
    76  }