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|
//go:build !windows
package main
import (
"context"
"net"
"os"
"os/signal"
"path/filepath"
"strconv"
"time"
"github.com/containerd/log"
"github.com/docker/docker/daemon"
"github.com/docker/docker/daemon/config"
"github.com/docker/docker/libcontainerd/supervisor"
"github.com/docker/docker/libnetwork/portallocator"
"github.com/docker/docker/pkg/homedir"
"github.com/pkg/errors"
"golang.org/x/sys/unix"
)
func getDefaultDaemonConfigDir() (string, error) {
if !honorXDG {
return "/etc/docker", nil
}
// NOTE: CLI uses ~/.docker while the daemon uses ~/.config/docker, because
// ~/.docker was not designed to store daemon configurations.
// In future, the daemon directory may be renamed to ~/.config/moby-engine (?).
configHome, err := homedir.GetConfigHome()
if err != nil {
return "", nil
}
return filepath.Join(configHome, "docker"), nil
}
func getDefaultDaemonConfigFile() (string, error) {
dir, err := getDefaultDaemonConfigDir()
if err != nil {
return "", err
}
return filepath.Join(dir, "daemon.json"), nil
}
// setDefaultUmask sets the umask to 0022 to avoid problems
// caused by custom umask
func setDefaultUmask() error {
desiredUmask := 0o022
unix.Umask(desiredUmask)
if umask := unix.Umask(desiredUmask); umask != desiredUmask {
return errors.Errorf("failed to set umask: expected %#o, got %#o", desiredUmask, umask)
}
return nil
}
// setupConfigReloadTrap configures the SIGHUP signal to reload the configuration.
func (cli *DaemonCli) setupConfigReloadTrap() {
c := make(chan os.Signal, 1)
signal.Notify(c, unix.SIGHUP)
go func() {
for range c {
cli.reloadConfig()
}
}()
}
// getSwarmRunRoot gets the root directory for swarm to store runtime state
// For example, the control socket
func (cli *DaemonCli) getSwarmRunRoot() string {
return filepath.Join(cli.Config.ExecRoot, "swarm")
}
// allocateDaemonPort ensures that there are no containers
// that try to use any port allocated for the docker server.
func allocateDaemonPort(addr string) error {
host, port, err := net.SplitHostPort(addr)
if err != nil {
return errors.Wrap(err, "error parsing tcp address")
}
intPort, err := strconv.Atoi(port)
if err != nil {
return errors.Wrap(err, "error parsing tcp address")
}
var hostIPs []net.IP
if parsedIP := net.ParseIP(host); parsedIP != nil {
hostIPs = append(hostIPs, parsedIP)
} else if hostIPs, err = net.LookupIP(host); err != nil {
return errors.Errorf("failed to lookup %s address in host specification", host)
}
pa := portallocator.Get()
for _, hostIP := range hostIPs {
if _, err := pa.RequestPort(hostIP, "tcp", intPort); err != nil {
return errors.Errorf("failed to allocate daemon listening port %d (err: %v)", intPort, err)
}
}
return nil
}
func newCgroupParent(config *config.Config) string {
cgroupParent := "docker"
useSystemd := daemon.UsingSystemd(config)
if useSystemd {
cgroupParent = "system.slice"
}
if config.CgroupParent != "" {
cgroupParent = config.CgroupParent
}
if useSystemd {
cgroupParent = cgroupParent + ":" + "docker" + ":"
}
return cgroupParent
}
func (cli *DaemonCli) initContainerd(ctx context.Context) (func(time.Duration) error, error) {
if cli.ContainerdAddr != "" {
// use system containerd at the given address.
return nil, nil
}
systemContainerdAddr, ok, err := systemContainerdRunning(honorXDG)
if err != nil {
return nil, errors.Wrap(err, "could not determine whether the system containerd is running")
}
if ok {
// detected a system containerd at the given address.
cli.ContainerdAddr = systemContainerdAddr
return nil, nil
}
log.G(ctx).Info("containerd not running, starting managed containerd")
opts, err := cli.getContainerdDaemonOpts()
if err != nil {
return nil, errors.Wrap(err, "failed to generate containerd options")
}
r, err := supervisor.Start(ctx, filepath.Join(cli.Root, "containerd"), filepath.Join(cli.ExecRoot, "containerd"), opts...)
if err != nil {
return nil, errors.Wrap(err, "failed to start containerd")
}
cli.ContainerdAddr = r.Address()
// Try to wait for containerd to shutdown
return r.WaitTimeout, nil
}
|
