open-consul/agent/consul/structs/operator.go

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package structs
import (
"time"
"github.com/hashicorp/raft"
"github.com/hashicorp/serf/serf"
)
// AutopilotConfig holds the Autopilot configuration for a cluster.
type AutopilotConfig struct {
// CleanupDeadServers controls whether to remove dead servers when a new
// server is added to the Raft peers.
CleanupDeadServers bool
// LastContactThreshold is the limit on the amount of time a server can go
// without leader contact before being considered unhealthy.
LastContactThreshold time.Duration
// MaxTrailingLogs is the amount of entries in the Raft Log that a server can
// be behind before being considered unhealthy.
MaxTrailingLogs uint64
// ServerStabilizationTime is the minimum amount of time a server must be
// in a stable, healthy state before it can be added to the cluster. Only
// applicable with Raft protocol version 3 or higher.
ServerStabilizationTime time.Duration
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// (Enterprise-only) RedundancyZoneTag is the node tag to use for separating
// servers into zones for redundancy. If left blank, this feature will be disabled.
RedundancyZoneTag string
// (Enterprise-only) DisableUpgradeMigration will disable Autopilot's upgrade migration
// strategy of waiting until enough newer-versioned servers have been added to the
// cluster before promoting them to voters.
DisableUpgradeMigration bool
// RaftIndex stores the create/modify indexes of this configuration.
RaftIndex
}
// RaftServer has information about a server in the Raft configuration.
type RaftServer struct {
// ID is the unique ID for the server. These are currently the same
// as the address, but they will be changed to a real GUID in a future
// release of Consul.
ID raft.ServerID
// Node is the node name of the server, as known by Consul, or this
// will be set to "(unknown)" otherwise.
Node string
// Address is the IP:port of the server, used for Raft communications.
Address raft.ServerAddress
// Leader is true if this server is the current cluster leader.
Leader bool
// Voter is true if this server has a vote in the cluster. This might
// be false if the server is staging and still coming online, or if
// it's a non-voting server, which will be added in a future release of
// Consul.
Voter bool
}
// RaftConfigrationResponse is returned when querying for the current Raft
// configuration.
type RaftConfigurationResponse struct {
// Servers has the list of servers in the Raft configuration.
Servers []*RaftServer
// Index has the Raft index of this configuration.
Index uint64
}
// RaftRemovePeerRequest is used by the Operator endpoint to apply a Raft
// operation on a specific Raft peer by address in the form of "IP:port".
type RaftRemovePeerRequest struct {
// Datacenter is the target this request is intended for.
Datacenter string
// Address is the peer to remove, in the form "IP:port".
Address raft.ServerAddress
// ID is the peer ID to remove.
ID raft.ServerID
// WriteRequest holds the ACL token to go along with this request.
WriteRequest
}
// RequestDatacenter returns the datacenter for a given request.
func (op *RaftRemovePeerRequest) RequestDatacenter() string {
return op.Datacenter
}
// AutopilotSetConfigRequest is used by the Operator endpoint to update the
// current Autopilot configuration of the cluster.
type AutopilotSetConfigRequest struct {
// Datacenter is the target this request is intended for.
Datacenter string
// Config is the new Autopilot configuration to use.
Config AutopilotConfig
// CAS controls whether to use check-and-set semantics for this request.
CAS bool
// WriteRequest holds the ACL token to go along with this request.
WriteRequest
}
// RequestDatacenter returns the datacenter for a given request.
func (op *AutopilotSetConfigRequest) RequestDatacenter() string {
return op.Datacenter
}
// ServerHealth is the health (from the leader's point of view) of a server.
type ServerHealth struct {
// ID is the raft ID of the server.
ID string
// Name is the node name of the server.
Name string
// Address is the address of the server.
Address string
// The status of the SerfHealth check for the server.
SerfStatus serf.MemberStatus
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// Version is the Consul version of the server.
Version string
// Leader is whether this server is currently the leader.
Leader bool
// LastContact is the time since this node's last contact with the leader.
LastContact time.Duration
// LastTerm is the highest leader term this server has a record of in its Raft log.
LastTerm uint64
// LastIndex is the last log index this server has a record of in its Raft log.
LastIndex uint64
// Healthy is whether or not the server is healthy according to the current
// Autopilot config.
Healthy bool
// Voter is whether this is a voting server.
Voter bool
// StableSince is the last time this server's Healthy value changed.
StableSince time.Time
}
// IsHealthy determines whether this ServerHealth is considered healthy
// based on the given Autopilot config
func (h *ServerHealth) IsHealthy(lastTerm uint64, leaderLastIndex uint64, autopilotConf *AutopilotConfig) bool {
if h.SerfStatus != serf.StatusAlive {
return false
}
if h.LastContact > autopilotConf.LastContactThreshold || h.LastContact < 0 {
return false
}
if h.LastTerm != lastTerm {
return false
}
if leaderLastIndex > autopilotConf.MaxTrailingLogs && h.LastIndex < leaderLastIndex-autopilotConf.MaxTrailingLogs {
return false
}
return true
}
// IsStable returns true if the ServerHealth is in a stable, passing state
// according to the given AutopilotConfig
func (h *ServerHealth) IsStable(now time.Time, conf *AutopilotConfig) bool {
if h == nil {
return false
}
if !h.Healthy {
return false
}
if now.Sub(h.StableSince) < conf.ServerStabilizationTime {
return false
}
return true
}
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// ServerStats holds miscellaneous Raft metrics for a server
type ServerStats struct {
// LastContact is the time since this node's last contact with the leader.
LastContact string
// LastTerm is the highest leader term this server has a record of in its Raft log.
LastTerm uint64
// LastIndex is the last log index this server has a record of in its Raft log.
LastIndex uint64
}
// OperatorHealthReply is a representation of the overall health of the cluster
type OperatorHealthReply struct {
// Healthy is true if all the servers in the cluster are healthy.
Healthy bool
// FailureTolerance is the number of healthy servers that could be lost without
// an outage occurring.
FailureTolerance int
// Servers holds the health of each server.
Servers []ServerHealth
}