mirror of
https://github.com/moby/moby.git
synced 2022-11-09 12:21:53 -05:00
562 lines
14 KiB
Go
562 lines
14 KiB
Go
package cluster
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import (
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"fmt"
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"net"
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"strings"
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"time"
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"github.com/Sirupsen/logrus"
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apierrors "github.com/docker/docker/api/errors"
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apitypes "github.com/docker/docker/api/types"
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"github.com/docker/docker/api/types/filters"
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types "github.com/docker/docker/api/types/swarm"
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"github.com/docker/docker/daemon/cluster/convert"
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"github.com/docker/docker/opts"
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"github.com/docker/docker/pkg/signal"
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swarmapi "github.com/docker/swarmkit/api"
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"github.com/docker/swarmkit/manager/encryption"
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swarmnode "github.com/docker/swarmkit/node"
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"github.com/pkg/errors"
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"golang.org/x/net/context"
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)
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// Init initializes new cluster from user provided request.
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func (c *Cluster) Init(req types.InitRequest) (string, error) {
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c.controlMutex.Lock()
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defer c.controlMutex.Unlock()
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c.mu.Lock()
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if c.nr != nil {
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if req.ForceNewCluster {
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if err := c.nr.Stop(); err != nil {
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c.mu.Unlock()
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return "", err
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}
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} else {
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c.mu.Unlock()
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return "", errSwarmExists
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}
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}
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c.mu.Unlock()
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if err := validateAndSanitizeInitRequest(&req); err != nil {
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return "", apierrors.NewBadRequestError(err)
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}
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listenHost, listenPort, err := resolveListenAddr(req.ListenAddr)
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if err != nil {
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return "", err
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}
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advertiseHost, advertisePort, err := c.resolveAdvertiseAddr(req.AdvertiseAddr, listenPort)
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if err != nil {
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return "", err
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}
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localAddr := listenHost
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// If the local address is undetermined, the advertise address
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// will be used as local address, if it belongs to this system.
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// If the advertise address is not local, then we try to find
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// a system address to use as local address. If this fails,
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// we give up and ask the user to pass the listen address.
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if net.ParseIP(localAddr).IsUnspecified() {
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advertiseIP := net.ParseIP(advertiseHost)
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found := false
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for _, systemIP := range listSystemIPs() {
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if systemIP.Equal(advertiseIP) {
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localAddr = advertiseIP.String()
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found = true
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break
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}
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}
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if !found {
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ip, err := c.resolveSystemAddr()
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if err != nil {
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logrus.Warnf("Could not find a local address: %v", err)
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return "", errMustSpecifyListenAddr
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}
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localAddr = ip.String()
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}
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}
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if !req.ForceNewCluster {
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clearPersistentState(c.root)
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}
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nr, err := c.newNodeRunner(nodeStartConfig{
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forceNewCluster: req.ForceNewCluster,
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autolock: req.AutoLockManagers,
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LocalAddr: localAddr,
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ListenAddr: net.JoinHostPort(listenHost, listenPort),
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AdvertiseAddr: net.JoinHostPort(advertiseHost, advertisePort),
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availability: req.Availability,
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})
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if err != nil {
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return "", err
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}
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c.mu.Lock()
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c.nr = nr
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c.mu.Unlock()
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if err := <-nr.Ready(); err != nil {
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if !req.ForceNewCluster { // if failure on first attempt don't keep state
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if err := clearPersistentState(c.root); err != nil {
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return "", err
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}
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}
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if err != nil {
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c.mu.Lock()
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c.nr = nil
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c.mu.Unlock()
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}
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return "", err
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}
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state := nr.State()
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if state.swarmNode == nil { // should never happen but protect from panic
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return "", errors.New("invalid cluster state for spec initialization")
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}
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if err := initClusterSpec(state.swarmNode, req.Spec); err != nil {
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return "", err
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}
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return state.NodeID(), nil
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}
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// Join makes current Cluster part of an existing swarm cluster.
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func (c *Cluster) Join(req types.JoinRequest) error {
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c.controlMutex.Lock()
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defer c.controlMutex.Unlock()
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c.mu.Lock()
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if c.nr != nil {
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c.mu.Unlock()
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return errSwarmExists
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}
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c.mu.Unlock()
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if err := validateAndSanitizeJoinRequest(&req); err != nil {
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return apierrors.NewBadRequestError(err)
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}
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listenHost, listenPort, err := resolveListenAddr(req.ListenAddr)
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if err != nil {
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return err
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}
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var advertiseAddr string
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if req.AdvertiseAddr != "" {
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advertiseHost, advertisePort, err := c.resolveAdvertiseAddr(req.AdvertiseAddr, listenPort)
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// For joining, we don't need to provide an advertise address,
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// since the remote side can detect it.
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if err == nil {
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advertiseAddr = net.JoinHostPort(advertiseHost, advertisePort)
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}
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}
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clearPersistentState(c.root)
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nr, err := c.newNodeRunner(nodeStartConfig{
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RemoteAddr: req.RemoteAddrs[0],
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ListenAddr: net.JoinHostPort(listenHost, listenPort),
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AdvertiseAddr: advertiseAddr,
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joinAddr: req.RemoteAddrs[0],
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joinToken: req.JoinToken,
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availability: req.Availability,
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})
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if err != nil {
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return err
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}
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c.mu.Lock()
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c.nr = nr
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c.mu.Unlock()
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select {
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case <-time.After(swarmConnectTimeout):
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return errSwarmJoinTimeoutReached
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case err := <-nr.Ready():
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if err != nil {
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c.mu.Lock()
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c.nr = nil
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c.mu.Unlock()
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}
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return err
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}
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}
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// Inspect retrieves the configuration properties of a managed swarm cluster.
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func (c *Cluster) Inspect() (types.Swarm, error) {
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c.mu.RLock()
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defer c.mu.RUnlock()
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state := c.currentNodeState()
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if !state.IsActiveManager() {
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return types.Swarm{}, c.errNoManager(state)
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}
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ctx, cancel := c.getRequestContext()
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defer cancel()
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swarm, err := getSwarm(ctx, state.controlClient)
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if err != nil {
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return types.Swarm{}, err
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}
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return convert.SwarmFromGRPC(*swarm), nil
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}
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// Update updates configuration of a managed swarm cluster.
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func (c *Cluster) Update(version uint64, spec types.Spec, flags types.UpdateFlags) error {
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c.mu.RLock()
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defer c.mu.RUnlock()
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state := c.currentNodeState()
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if !state.IsActiveManager() {
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return c.errNoManager(state)
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}
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ctx, cancel := c.getRequestContext()
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defer cancel()
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swarm, err := getSwarm(ctx, state.controlClient)
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if err != nil {
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return err
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}
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// In update, client should provide the complete spec of the swarm, including
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// Name and Labels. If a field is specified with 0 or nil, then the default value
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// will be used to swarmkit.
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clusterSpec, err := convert.SwarmSpecToGRPC(spec)
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if err != nil {
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return apierrors.NewBadRequestError(err)
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}
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_, err = state.controlClient.UpdateCluster(
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ctx,
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&swarmapi.UpdateClusterRequest{
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ClusterID: swarm.ID,
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Spec: &clusterSpec,
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ClusterVersion: &swarmapi.Version{
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Index: version,
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},
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Rotation: swarmapi.KeyRotation{
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WorkerJoinToken: flags.RotateWorkerToken,
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ManagerJoinToken: flags.RotateManagerToken,
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ManagerUnlockKey: flags.RotateManagerUnlockKey,
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},
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},
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)
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return err
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}
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// GetUnlockKey returns the unlock key for the swarm.
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func (c *Cluster) GetUnlockKey() (string, error) {
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c.mu.RLock()
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defer c.mu.RUnlock()
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state := c.currentNodeState()
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if !state.IsActiveManager() {
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return "", c.errNoManager(state)
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}
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ctx, cancel := c.getRequestContext()
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defer cancel()
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client := swarmapi.NewCAClient(state.grpcConn)
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r, err := client.GetUnlockKey(ctx, &swarmapi.GetUnlockKeyRequest{})
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if err != nil {
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return "", err
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}
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if len(r.UnlockKey) == 0 {
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// no key
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return "", nil
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}
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return encryption.HumanReadableKey(r.UnlockKey), nil
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}
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// UnlockSwarm provides a key to decrypt data that is encrypted at rest.
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func (c *Cluster) UnlockSwarm(req types.UnlockRequest) error {
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c.controlMutex.Lock()
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defer c.controlMutex.Unlock()
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c.mu.RLock()
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state := c.currentNodeState()
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if !state.IsActiveManager() {
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// when manager is not active,
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// unless it is locked, otherwise return error.
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if err := c.errNoManager(state); err != errSwarmLocked {
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c.mu.RUnlock()
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return err
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}
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} else {
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// when manager is active, return an error of "not locked"
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c.mu.RUnlock()
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return errors.New("swarm is not locked")
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}
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// only when swarm is locked, code running reaches here
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nr := c.nr
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c.mu.RUnlock()
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key, err := encryption.ParseHumanReadableKey(req.UnlockKey)
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if err != nil {
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return err
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}
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config := nr.config
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config.lockKey = key
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if err := nr.Stop(); err != nil {
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return err
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}
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nr, err = c.newNodeRunner(config)
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if err != nil {
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return err
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}
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c.mu.Lock()
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c.nr = nr
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c.mu.Unlock()
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if err := <-nr.Ready(); err != nil {
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if errors.Cause(err) == errSwarmLocked {
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return errors.New("swarm could not be unlocked: invalid key provided")
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}
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return fmt.Errorf("swarm component could not be started: %v", err)
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}
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return nil
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}
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// Leave shuts down Cluster and removes current state.
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func (c *Cluster) Leave(force bool) error {
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c.controlMutex.Lock()
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defer c.controlMutex.Unlock()
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c.mu.Lock()
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nr := c.nr
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if nr == nil {
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c.mu.Unlock()
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return errNoSwarm
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}
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state := c.currentNodeState()
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if errors.Cause(state.err) == errSwarmLocked && !force {
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// leave a locked swarm without --force is not allowed
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c.mu.Unlock()
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return errors.New("Swarm is encrypted and locked. Please unlock it first or use `--force` to ignore this message.")
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}
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if state.IsManager() && !force {
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msg := "You are attempting to leave the swarm on a node that is participating as a manager. "
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if state.IsActiveManager() {
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active, reachable, unreachable, err := managerStats(state.controlClient, state.NodeID())
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if err == nil {
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if active && removingManagerCausesLossOfQuorum(reachable, unreachable) {
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if isLastManager(reachable, unreachable) {
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msg += "Removing the last manager erases all current state of the swarm. Use `--force` to ignore this message. "
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c.mu.Unlock()
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return errors.New(msg)
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}
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msg += fmt.Sprintf("Removing this node leaves %v managers out of %v. Without a Raft quorum your swarm will be inaccessible. ", reachable-1, reachable+unreachable)
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}
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}
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} else {
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msg += "Doing so may lose the consensus of your cluster. "
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}
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msg += "The only way to restore a swarm that has lost consensus is to reinitialize it with `--force-new-cluster`. Use `--force` to suppress this message."
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c.mu.Unlock()
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return errors.New(msg)
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}
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// release readers in here
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if err := nr.Stop(); err != nil {
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logrus.Errorf("failed to shut down cluster node: %v", err)
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signal.DumpStacks("")
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c.mu.Unlock()
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return err
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}
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c.nr = nil
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c.mu.Unlock()
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if nodeID := state.NodeID(); nodeID != "" {
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nodeContainers, err := c.listContainerForNode(nodeID)
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if err != nil {
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return err
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}
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for _, id := range nodeContainers {
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if err := c.config.Backend.ContainerRm(id, &apitypes.ContainerRmConfig{ForceRemove: true}); err != nil {
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logrus.Errorf("error removing %v: %v", id, err)
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}
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}
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}
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c.configEvent <- struct{}{}
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// todo: cleanup optional?
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if err := clearPersistentState(c.root); err != nil {
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return err
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}
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c.config.Backend.DaemonLeavesCluster()
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return nil
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}
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// Info returns information about the current cluster state.
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func (c *Cluster) Info() types.Info {
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info := types.Info{
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NodeAddr: c.GetAdvertiseAddress(),
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}
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c.mu.RLock()
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defer c.mu.RUnlock()
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state := c.currentNodeState()
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info.LocalNodeState = state.status
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if state.err != nil {
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info.Error = state.err.Error()
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}
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ctx, cancel := c.getRequestContext()
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defer cancel()
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if state.IsActiveManager() {
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info.ControlAvailable = true
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swarm, err := c.Inspect()
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if err != nil {
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info.Error = err.Error()
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}
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// Strip JoinTokens
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info.Cluster = swarm.ClusterInfo
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if r, err := state.controlClient.ListNodes(ctx, &swarmapi.ListNodesRequest{}); err != nil {
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info.Error = err.Error()
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} else {
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info.Nodes = len(r.Nodes)
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for _, n := range r.Nodes {
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if n.ManagerStatus != nil {
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info.Managers = info.Managers + 1
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}
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}
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}
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}
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if state.swarmNode != nil {
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for _, r := range state.swarmNode.Remotes() {
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info.RemoteManagers = append(info.RemoteManagers, types.Peer{NodeID: r.NodeID, Addr: r.Addr})
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}
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info.NodeID = state.swarmNode.NodeID()
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}
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return info
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}
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func validateAndSanitizeInitRequest(req *types.InitRequest) error {
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var err error
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req.ListenAddr, err = validateAddr(req.ListenAddr)
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if err != nil {
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return fmt.Errorf("invalid ListenAddr %q: %v", req.ListenAddr, err)
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}
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if req.Spec.Annotations.Name == "" {
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req.Spec.Annotations.Name = "default"
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} else if req.Spec.Annotations.Name != "default" {
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return errors.New(`swarm spec must be named "default"`)
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}
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return nil
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}
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func validateAndSanitizeJoinRequest(req *types.JoinRequest) error {
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var err error
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req.ListenAddr, err = validateAddr(req.ListenAddr)
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if err != nil {
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return fmt.Errorf("invalid ListenAddr %q: %v", req.ListenAddr, err)
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}
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if len(req.RemoteAddrs) == 0 {
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return errors.New("at least 1 RemoteAddr is required to join")
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}
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for i := range req.RemoteAddrs {
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req.RemoteAddrs[i], err = validateAddr(req.RemoteAddrs[i])
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if err != nil {
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return fmt.Errorf("invalid remoteAddr %q: %v", req.RemoteAddrs[i], err)
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}
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}
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return nil
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}
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func validateAddr(addr string) (string, error) {
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if addr == "" {
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return addr, errors.New("invalid empty address")
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}
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newaddr, err := opts.ParseTCPAddr(addr, defaultAddr)
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if err != nil {
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return addr, nil
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}
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return strings.TrimPrefix(newaddr, "tcp://"), nil
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}
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func initClusterSpec(node *swarmnode.Node, spec types.Spec) error {
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ctx, _ := context.WithTimeout(context.Background(), 5*time.Second)
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for conn := range node.ListenControlSocket(ctx) {
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if ctx.Err() != nil {
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return ctx.Err()
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}
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if conn != nil {
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client := swarmapi.NewControlClient(conn)
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var cluster *swarmapi.Cluster
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for i := 0; ; i++ {
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lcr, err := client.ListClusters(ctx, &swarmapi.ListClustersRequest{})
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if err != nil {
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return fmt.Errorf("error on listing clusters: %v", err)
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}
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if len(lcr.Clusters) == 0 {
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if i < 10 {
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time.Sleep(200 * time.Millisecond)
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continue
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}
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return errors.New("empty list of clusters was returned")
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}
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cluster = lcr.Clusters[0]
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break
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}
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// In init, we take the initial default values from swarmkit, and merge
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// any non nil or 0 value from spec to GRPC spec. This will leave the
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// default value alone.
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// Note that this is different from Update(), as in Update() we expect
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// user to specify the complete spec of the cluster (as they already know
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// the existing one and knows which field to update)
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clusterSpec, err := convert.MergeSwarmSpecToGRPC(spec, cluster.Spec)
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if err != nil {
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return fmt.Errorf("error updating cluster settings: %v", err)
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}
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_, err = client.UpdateCluster(ctx, &swarmapi.UpdateClusterRequest{
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ClusterID: cluster.ID,
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ClusterVersion: &cluster.Meta.Version,
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Spec: &clusterSpec,
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})
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if err != nil {
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return fmt.Errorf("error updating cluster settings: %v", err)
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}
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return nil
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}
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}
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return ctx.Err()
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}
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func (c *Cluster) listContainerForNode(nodeID string) ([]string, error) {
|
|
var ids []string
|
|
filters := filters.NewArgs()
|
|
filters.Add("label", fmt.Sprintf("com.docker.swarm.node.id=%s", nodeID))
|
|
containers, err := c.config.Backend.Containers(&apitypes.ContainerListOptions{
|
|
Filters: filters,
|
|
})
|
|
if err != nil {
|
|
return []string{}, err
|
|
}
|
|
for _, c := range containers {
|
|
ids = append(ids, c.ID)
|
|
}
|
|
return ids, nil
|
|
}
|