Documentation
¶
Overview ¶
Package embed provides bindings for embedding an etcd server in a program.
Launch an embedded etcd server using the configuration defaults:
import (
"log"
"time"
"github.com/coreos/etcd/embed"
)
func main() {
cfg := embed.NewConfig()
cfg.Dir = "default.etcd"
e, err := embed.StartEtcd(cfg)
if err != nil {
log.Fatal(err)
}
defer e.Close()
select {
case <-e.Server.ReadyNotify():
log.Printf("Server is ready!")
case <-time.After(60 * time.Second):
e.Server.Stop() // trigger a shutdown
log.Printf("Server took too long to start!")
}
log.Fatal(<-e.Err())
}
Index ¶
- Constants
- Variables
- type Config
- func (cfg Config) ElectionTicks() int
- func (cfg Config) InitialClusterFromName(name string) (ret string)
- func (cfg Config) IsNewCluster() bool
- func (cfg *Config) PeerURLsMapAndToken(which string) (urlsmap types.URLsMap, token string, err error)
- func (cfg *Config) UpdateDefaultClusterFromName(defaultInitialCluster string) (string, error)
- func (cfg *Config) Validate() error
- type Etcd
Constants ¶
const ( ClusterStateFlagNew = "new" ClusterStateFlagExisting = "existing" DefaultName = "default" DefaultMaxSnapshots = 5 DefaultMaxWALs = 5 DefaultListenPeerURLs = "http://localhost:2380" DefaultListenClientURLs = "http://localhost:2379" )
Variables ¶
var ( ErrConflictBootstrapFlags = fmt.Errorf("multiple discovery or bootstrap flags are set. " + "Choose one of \"initial-cluster\", \"discovery\" or \"discovery-srv\"") ErrUnsetAdvertiseClientURLsFlag = fmt.Errorf("--advertise-client-urls is required when --listen-client-urls is set explicitly") DefaultInitialAdvertisePeerURLs = "http://localhost:2380" DefaultAdvertiseClientURLs = "http://localhost:2379" )
Functions ¶
This section is empty.
Types ¶
type Config ¶
type Config struct {
CorsInfo *cors.CORSInfo
LPUrls, LCUrls []url.URL
Dir string `json:"data-dir"`
WalDir string `json:"wal-dir"`
MaxSnapFiles uint `json:"max-snapshots"`
MaxWalFiles uint `json:"max-wals"`
Name string `json:"name"`
SnapCount uint64 `json:"snapshot-count"`
AutoCompactionRetention int `json:"auto-compaction-retention"`
// TickMs is the number of milliseconds between heartbeat ticks.
// TODO: decouple tickMs and heartbeat tick (current heartbeat tick = 1).
// make ticks a cluster wide configuration.
TickMs uint `json:"heartbeat-interval"`
ElectionMs uint `json:"election-timeout"`
QuotaBackendBytes int64 `json:"quota-backend-bytes"`
APUrls, ACUrls []url.URL
ClusterState string `json:"initial-cluster-state"`
DNSCluster string `json:"discovery-srv"`
Dproxy string `json:"discovery-proxy"`
Durl string `json:"discovery"`
InitialCluster string `json:"initial-cluster"`
InitialClusterToken string `json:"initial-cluster-token"`
StrictReconfigCheck bool `json:"strict-reconfig-check"`
EnableV2 bool `json:"enable-v2"`
ClientTLSInfo transport.TLSInfo
ClientAutoTLS bool
PeerTLSInfo transport.TLSInfo
PeerAutoTLS bool
Debug bool `json:"debug"`
LogPkgLevels string `json:"log-package-levels"`
EnablePprof bool `json:"enable-pprof"`
Metrics string `json:"metrics"`
// ForceNewCluster starts a new cluster even if previously started; unsafe.
ForceNewCluster bool `json:"force-new-cluster"`
// UserHandlers is for registering users handlers and only used for
// embedding etcd into other applications.
// The map key is the route path for the handler, and
// you must ensure it can't be conflicted with etcd's.
UserHandlers map[string]http.Handler `json:"-"`
// ServiceRegister is for registering users' gRPC services. A simple usage example:
// cfg := embed.NewConfig()
// cfg.ServerRegister = func(s *grpc.Server) {
// pb.RegisterFooServer(s, &fooServer{})
// pb.RegisterBarServer(s, &barServer{})
// }
// embed.StartEtcd(cfg)
ServiceRegister func(*grpc.Server) `json:"-"`
AuthToken string `json:"auth-token"`
}
Config holds the arguments for configuring an etcd server.
func ConfigFromFile ¶
func NewConfig ¶
func NewConfig() *Config
NewConfig creates a new Config populated with default values.
func (Config) ElectionTicks ¶
func (Config) InitialClusterFromName ¶
func (Config) IsNewCluster ¶
func (*Config) PeerURLsMapAndToken ¶
func (cfg *Config) PeerURLsMapAndToken(which string) (urlsmap types.URLsMap, token string, err error)
PeerURLsMapAndToken sets up an initial peer URLsMap and cluster token for bootstrap or discovery.
func (*Config) UpdateDefaultClusterFromName ¶
UpdateDefaultClusterFromName updates cluster advertise URLs with, if available, default host, if advertise URLs are default values(localhost:2379,2380) AND if listen URL is 0.0.0.0. e.g. advertise peer URL localhost:2380 or listen peer URL 0.0.0.0:2380 then the advertise peer host would be updated with machine's default host, while keeping the listen URL's port. User can work around this by explicitly setting URL with 127.0.0.1. It returns the default hostname, if used, and the error, if any, from getting the machine's default host. TODO: check whether fields are set instead of whether fields have default value
type Etcd ¶
type Etcd struct {
Peers []*peerListener
Clients []net.Listener
Server *etcdserver.EtcdServer
// contains filtered or unexported fields
}
Etcd contains a running etcd server and its listeners.
Source Files