143 lines
4.2 KiB
Go
143 lines
4.2 KiB
Go
package consul
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import (
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"context"
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"fmt"
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"github.com/armon/go-metrics"
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"github.com/armon/go-metrics/prometheus"
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"github.com/hashicorp/raft"
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autopilot "github.com/hashicorp/raft-autopilot"
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"github.com/hashicorp/serf/serf"
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"github.com/hashicorp/consul/agent/metadata"
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"github.com/hashicorp/consul/agent/structs"
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"github.com/hashicorp/consul/types"
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)
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var AutopilotGauges = []prometheus.GaugeDefinition{
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{
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Name: []string{"autopilot", "failure_tolerance"},
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Help: "Tracks the number of voting servers that the cluster can lose while continuing to function.",
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},
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{
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Name: []string{"autopilot", "healthy"},
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Help: "Tracks the overall health of the local server cluster. 1 if all servers are healthy, 0 if one or more are unhealthy.",
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},
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}
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// AutopilotDelegate is a Consul delegate for autopilot operations.
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type AutopilotDelegate struct {
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server *Server
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}
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func (d *AutopilotDelegate) AutopilotConfig() *autopilot.Config {
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return d.server.getOrCreateAutopilotConfig().ToAutopilotLibraryConfig()
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}
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func (d *AutopilotDelegate) KnownServers() map[raft.ServerID]*autopilot.Server {
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return d.server.autopilotServers()
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}
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func (d *AutopilotDelegate) FetchServerStats(ctx context.Context, servers map[raft.ServerID]*autopilot.Server) map[raft.ServerID]*autopilot.ServerStats {
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return d.server.statsFetcher.Fetch(ctx, servers)
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}
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func (d *AutopilotDelegate) NotifyState(state *autopilot.State) {
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// emit metrics if we are the leader regarding overall healthiness and the failure tolerance
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if d.server.raft.State() == raft.Leader {
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metrics.SetGauge([]string{"autopilot", "failure_tolerance"}, float32(state.FailureTolerance))
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if state.Healthy {
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metrics.SetGauge([]string{"autopilot", "healthy"}, 1)
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} else {
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metrics.SetGauge([]string{"autopilot", "healthy"}, 0)
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}
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}
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}
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func (d *AutopilotDelegate) RemoveFailedServer(srv *autopilot.Server) {
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go func() {
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if err := d.server.RemoveFailedNode(srv.Name, false); err != nil {
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d.server.logger.Error("failed to remove server", "name", srv.Name, "id", srv.ID, "error", err)
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}
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}()
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}
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func (s *Server) initAutopilot(config *Config) {
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apDelegate := &AutopilotDelegate{s}
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s.autopilot = autopilot.New(
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s.raft,
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apDelegate,
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autopilot.WithLogger(s.logger),
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autopilot.WithReconcileInterval(config.AutopilotInterval),
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autopilot.WithUpdateInterval(config.ServerHealthInterval),
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autopilot.WithPromoter(s.autopilotPromoter()),
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)
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}
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func (s *Server) autopilotServers() map[raft.ServerID]*autopilot.Server {
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servers := make(map[raft.ServerID]*autopilot.Server)
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for _, member := range s.serfLAN.Members() {
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srv, err := s.autopilotServer(member)
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if err != nil {
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s.logger.Warn("Error parsing server info", "name", member.Name, "error", err)
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continue
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} else if srv == nil {
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// this member was a client
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continue
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}
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servers[srv.ID] = srv
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}
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return servers
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}
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func (s *Server) autopilotServer(m serf.Member) (*autopilot.Server, error) {
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ok, srv := metadata.IsConsulServer(m)
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if !ok {
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return nil, nil
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}
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return s.autopilotServerFromMetadata(srv)
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}
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func (s *Server) autopilotServerFromMetadata(srv *metadata.Server) (*autopilot.Server, error) {
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server := &autopilot.Server{
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Name: srv.ShortName,
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ID: raft.ServerID(srv.ID),
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Address: raft.ServerAddress(srv.Addr.String()),
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Version: srv.Build.String(),
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RaftVersion: srv.RaftVersion,
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Ext: s.autopilotServerExt(srv),
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}
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switch srv.Status {
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case serf.StatusLeft:
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server.NodeStatus = autopilot.NodeLeft
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case serf.StatusAlive, serf.StatusLeaving:
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// we want to treat leaving as alive to prevent autopilot from
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// prematurely removing the node.
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server.NodeStatus = autopilot.NodeAlive
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case serf.StatusFailed:
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server.NodeStatus = autopilot.NodeFailed
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default:
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server.NodeStatus = autopilot.NodeUnknown
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}
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// populate the node meta if there is any. When a node first joins or if
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// there are ACL issues then this could be empty if the server has not
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// yet been able to register itself in the catalog
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_, node, err := s.fsm.State().GetNodeID(types.NodeID(srv.ID), structs.NodeEnterpriseMetaInDefaultPartition())
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if err != nil {
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return nil, fmt.Errorf("error retrieving node from state store: %w", err)
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}
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if node != nil {
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server.Meta = node.Meta
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}
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return server, nil
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}
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