daemon/prune.go
package daemon // import "github.com/docker/docker/daemon"
import (
"context"
"regexp"
"strconv"
"sync/atomic"
"time"
"github.com/containerd/log"
"github.com/docker/docker/api/types/backend"
"github.com/docker/docker/api/types/container"
"github.com/docker/docker/api/types/events"
"github.com/docker/docker/api/types/filters"
"github.com/docker/docker/api/types/network"
timetypes "github.com/docker/docker/api/types/time"
"github.com/docker/docker/errdefs"
"github.com/docker/docker/libnetwork"
"github.com/docker/docker/runconfig"
"github.com/pkg/errors"
)
var (
// errPruneRunning is returned when a prune request is received while
// one is in progress
errPruneRunning = errdefs.Conflict(errors.New("a prune operation is already running"))
containersAcceptedFilters = map[string]bool{
"label": true,
"label!": true,
"until": true,
}
networksAcceptedFilters = map[string]bool{
"label": true,
"label!": true,
"until": true,
}
)
// ContainersPrune removes unused containers
func (daemon *Daemon) ContainersPrune(ctx context.Context, pruneFilters filters.Args) (*container.PruneReport, error) {
if !atomic.CompareAndSwapInt32(&daemon.pruneRunning, 0, 1) {
return nil, errPruneRunning
}
defer atomic.StoreInt32(&daemon.pruneRunning, 0)
rep := &container.PruneReport{}
// make sure that only accepted filters have been received
err := pruneFilters.Validate(containersAcceptedFilters)
if err != nil {
return nil, err
}
until, err := getUntilFromPruneFilters(pruneFilters)
if err != nil {
return nil, err
}
cfg := &daemon.config().Config
allContainers := daemon.List()
for _, c := range allContainers {
select {
case <-ctx.Done():
log.G(ctx).Debugf("ContainersPrune operation cancelled: %#v", *rep)
return rep, nil
default:
}
if !c.IsRunning() {
if !until.IsZero() && c.Created.After(until) {
continue
}
if !matchLabels(pruneFilters, c.Config.Labels) {
continue
}
cSize, _, err := daemon.imageService.GetContainerLayerSize(ctx, c.ID)
if err != nil {
return nil, err
}
// TODO: sets RmLink to true?
err = daemon.containerRm(cfg, c.ID, &backend.ContainerRmConfig{})
if err != nil {
log.G(ctx).Warnf("failed to prune container %s: %v", c.ID, err)
continue
}
if cSize > 0 {
rep.SpaceReclaimed += uint64(cSize)
}
rep.ContainersDeleted = append(rep.ContainersDeleted, c.ID)
}
}
daemon.EventsService.Log(events.ActionPrune, events.ContainerEventType, events.Actor{
Attributes: map[string]string{"reclaimed": strconv.FormatUint(rep.SpaceReclaimed, 10)},
})
return rep, nil
}
// localNetworksPrune removes unused local networks
func (daemon *Daemon) localNetworksPrune(ctx context.Context, pruneFilters filters.Args) *network.PruneReport {
rep := &network.PruneReport{}
until, _ := getUntilFromPruneFilters(pruneFilters)
// When the function returns true, the walk will stop.
daemon.netController.WalkNetworks(func(nw *libnetwork.Network) bool {
select {
case <-ctx.Done():
// context cancelled
return true
default:
}
if nw.ConfigOnly() {
return false
}
if !until.IsZero() && nw.Created().After(until) {
return false
}
if !matchLabels(pruneFilters, nw.Labels()) {
return false
}
nwName := nw.Name()
if runconfig.IsPreDefinedNetwork(nwName) {
return false
}
if len(nw.Endpoints()) > 0 {
return false
}
if err := daemon.DeleteNetwork(nw.ID()); err != nil {
log.G(ctx).Warnf("could not remove local network %s: %v", nwName, err)
return false
}
rep.NetworksDeleted = append(rep.NetworksDeleted, nwName)
return false
})
return rep
}
// clusterNetworksPrune removes unused cluster networks
func (daemon *Daemon) clusterNetworksPrune(ctx context.Context, pruneFilters filters.Args) (*network.PruneReport, error) {
rep := &network.PruneReport{}
until, _ := getUntilFromPruneFilters(pruneFilters)
cluster := daemon.GetCluster()
if !cluster.IsManager() {
return rep, nil
}
networks, err := cluster.GetNetworks(pruneFilters)
if err != nil {
return rep, err
}
networkIsInUse := regexp.MustCompile(`network ([[:alnum:]]+) is in use`)
for _, nw := range networks {
select {
case <-ctx.Done():
return rep, nil
default:
if nw.Ingress {
// Routing-mesh network removal has to be explicitly invoked by user
continue
}
if !until.IsZero() && nw.Created.After(until) {
continue
}
if !matchLabels(pruneFilters, nw.Labels) {
continue
}
// https://github.com/docker/docker/issues/24186
// `docker network inspect` unfortunately displays ONLY those containers that are local to that node.
// So we try to remove it anyway and check the error
err = cluster.RemoveNetwork(nw.ID)
if err != nil {
// we can safely ignore the "network .. is in use" error
match := networkIsInUse.FindStringSubmatch(err.Error())
if len(match) != 2 || match[1] != nw.ID {
log.G(ctx).Warnf("could not remove cluster network %s: %v", nw.Name, err)
}
continue
}
rep.NetworksDeleted = append(rep.NetworksDeleted, nw.Name)
}
}
return rep, nil
}
// NetworksPrune removes unused networks
func (daemon *Daemon) NetworksPrune(ctx context.Context, pruneFilters filters.Args) (*network.PruneReport, error) {
if !atomic.CompareAndSwapInt32(&daemon.pruneRunning, 0, 1) {
return nil, errPruneRunning
}
defer atomic.StoreInt32(&daemon.pruneRunning, 0)
// make sure that only accepted filters have been received
err := pruneFilters.Validate(networksAcceptedFilters)
if err != nil {
return nil, err
}
if _, err := getUntilFromPruneFilters(pruneFilters); err != nil {
return nil, err
}
rep := &network.PruneReport{}
if clusterRep, err := daemon.clusterNetworksPrune(ctx, pruneFilters); err == nil {
rep.NetworksDeleted = append(rep.NetworksDeleted, clusterRep.NetworksDeleted...)
}
localRep := daemon.localNetworksPrune(ctx, pruneFilters)
rep.NetworksDeleted = append(rep.NetworksDeleted, localRep.NetworksDeleted...)
select {
case <-ctx.Done():
log.G(ctx).Debugf("NetworksPrune operation cancelled: %#v", *rep)
return rep, nil
default:
}
daemon.EventsService.Log(events.ActionPrune, events.NetworkEventType, events.Actor{
Attributes: map[string]string{"reclaimed": "0"},
})
return rep, nil
}
func getUntilFromPruneFilters(pruneFilters filters.Args) (time.Time, error) {
until := time.Time{}
if !pruneFilters.Contains("until") {
return until, nil
}
untilFilters := pruneFilters.Get("until")
if len(untilFilters) > 1 {
return until, errdefs.InvalidParameter(errors.New("more than one until filter specified"))
}
ts, err := timetypes.GetTimestamp(untilFilters[0], time.Now())
if err != nil {
return until, errdefs.InvalidParameter(err)
}
seconds, nanoseconds, err := timetypes.ParseTimestamps(ts, 0)
if err != nil {
return until, errdefs.InvalidParameter(err)
}
until = time.Unix(seconds, nanoseconds)
return until, nil
}
func matchLabels(pruneFilters filters.Args, labels map[string]string) bool {
if !pruneFilters.MatchKVList("label", labels) {
return false
}
// By default MatchKVList will return true if field (like 'label!') does not exist
// So we have to add additional Contains("label!") check
if pruneFilters.Contains("label!") {
if pruneFilters.MatchKVList("label!", labels) {
return false
}
}
return true
}