forked from hashicorp/consul
/
agent.go
526 lines (462 loc) · 14.6 KB
/
agent.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
package agent
import (
"flag"
"fmt"
"io"
"log"
"os"
"os/signal"
"path/filepath"
"strings"
"syscall"
"time"
"github.com/armon/go-metrics"
"github.com/armon/go-metrics/circonus"
"github.com/armon/go-metrics/datadog"
"github.com/armon/go-metrics/prometheus"
"github.com/hashicorp/consul/agent"
"github.com/hashicorp/consul/agent/config"
"github.com/hashicorp/consul/command/flags"
"github.com/hashicorp/consul/lib"
"github.com/hashicorp/consul/logger"
"github.com/hashicorp/go-checkpoint"
multierror "github.com/hashicorp/go-multierror"
"github.com/hashicorp/logutils"
"github.com/mitchellh/cli"
)
func New(ui cli.Ui, revision, version, versionPre, versionHuman string, shutdownCh <-chan struct{}) *cmd {
ui = &cli.PrefixedUi{
OutputPrefix: "==> ",
InfoPrefix: " ",
ErrorPrefix: "==> ",
Ui: ui,
}
c := &cmd{
UI: ui,
revision: revision,
version: version,
versionPrerelease: versionPre,
versionHuman: versionHuman,
shutdownCh: shutdownCh,
}
c.init()
return c
}
// AgentCommand is a Command implementation that runs a Consul agent.
// The command will not end unless a shutdown message is sent on the
// ShutdownCh. If two messages are sent on the ShutdownCh it will forcibly
// exit.
type cmd struct {
UI cli.Ui
flags *flag.FlagSet
http *flags.HTTPFlags
help string
revision string
version string
versionPrerelease string
versionHuman string
shutdownCh <-chan struct{}
args []string
flagArgs config.Flags
logFilter *logutils.LevelFilter
logOutput io.Writer
logger *log.Logger
}
func (c *cmd) init() {
c.flags = flag.NewFlagSet("", flag.ContinueOnError)
config.AddFlags(c.flags, &c.flagArgs)
c.help = flags.Usage(help, c.flags)
}
func (c *cmd) Run(args []string) int {
code := c.run(args)
if c.logger != nil {
c.logger.Println("[INFO] agent: Exit code:", code)
}
return code
}
// readConfig is responsible for setup of our configuration using
// the command line and any file configs
func (c *cmd) readConfig() *config.RuntimeConfig {
if err := c.flags.Parse(c.args); err != nil {
if !strings.Contains(err.Error(), "help requested") {
c.UI.Error(fmt.Sprintf("error parsing flags: %v", err))
}
return nil
}
c.flagArgs.Args = c.flags.Args()
b, err := config.NewBuilder(c.flagArgs)
if err != nil {
c.UI.Error(err.Error())
return nil
}
cfg, err := b.BuildAndValidate()
if err != nil {
c.UI.Error(err.Error())
return nil
}
for _, w := range b.Warnings {
c.UI.Warn(w)
}
return &cfg
}
// checkpointResults is used to handler periodic results from our update checker
func (c *cmd) checkpointResults(results *checkpoint.CheckResponse, err error) {
if err != nil {
c.UI.Error(fmt.Sprintf("Failed to check for updates: %v", err))
return
}
if results.Outdated {
c.UI.Error(fmt.Sprintf("Newer Consul version available: %s (currently running: %s)", results.CurrentVersion, c.version))
}
for _, alert := range results.Alerts {
switch alert.Level {
case "info":
c.UI.Info(fmt.Sprintf("Bulletin [%s]: %s (%s)", alert.Level, alert.Message, alert.URL))
default:
c.UI.Error(fmt.Sprintf("Bulletin [%s]: %s (%s)", alert.Level, alert.Message, alert.URL))
}
}
}
func (c *cmd) startupUpdateCheck(config *config.RuntimeConfig) {
version := config.Version
if config.VersionPrerelease != "" {
version += fmt.Sprintf("-%s", config.VersionPrerelease)
}
updateParams := &checkpoint.CheckParams{
Product: "consul",
Version: version,
}
if !config.DisableAnonymousSignature {
updateParams.SignatureFile = filepath.Join(config.DataDir, "checkpoint-signature")
}
// Schedule a periodic check with expected interval of 24 hours
checkpoint.CheckInterval(updateParams, 24*time.Hour, c.checkpointResults)
// Do an immediate check within the next 30 seconds
go func() {
time.Sleep(lib.RandomStagger(30 * time.Second))
c.checkpointResults(checkpoint.Check(updateParams))
}()
}
// startupJoin is invoked to handle any joins specified to take place at start time
func (c *cmd) startupJoin(agent *agent.Agent, cfg *config.RuntimeConfig) error {
if len(cfg.StartJoinAddrsLAN) == 0 {
return nil
}
c.UI.Output("Joining cluster...")
n, err := agent.JoinLAN(cfg.StartJoinAddrsLAN)
if err != nil {
return err
}
c.UI.Info(fmt.Sprintf("Join completed. Synced with %d initial agents", n))
return nil
}
// startupJoinWan is invoked to handle any joins -wan specified to take place at start time
func (c *cmd) startupJoinWan(agent *agent.Agent, cfg *config.RuntimeConfig) error {
if len(cfg.StartJoinAddrsWAN) == 0 {
return nil
}
c.UI.Output("Joining -wan cluster...")
n, err := agent.JoinWAN(cfg.StartJoinAddrsWAN)
if err != nil {
return err
}
c.UI.Info(fmt.Sprintf("Join -wan completed. Synced with %d initial agents", n))
return nil
}
func statsiteSink(config *config.RuntimeConfig, hostname string) (metrics.MetricSink, error) {
if config.TelemetryStatsiteAddr == "" {
return nil, nil
}
return metrics.NewStatsiteSink(config.TelemetryStatsiteAddr)
}
func statsdSink(config *config.RuntimeConfig, hostname string) (metrics.MetricSink, error) {
if config.TelemetryStatsdAddr == "" {
return nil, nil
}
return metrics.NewStatsdSink(config.TelemetryStatsdAddr)
}
func dogstatdSink(config *config.RuntimeConfig, hostname string) (metrics.MetricSink, error) {
if config.TelemetryDogstatsdAddr == "" {
return nil, nil
}
sink, err := datadog.NewDogStatsdSink(config.TelemetryDogstatsdAddr, hostname)
if err != nil {
return nil, err
}
sink.SetTags(config.TelemetryDogstatsdTags)
return sink, nil
}
func prometheusSink(config *config.RuntimeConfig, hostname string) (metrics.MetricSink, error) {
if config.TelemetryPrometheusRetentionTime.Nanoseconds() < 1 {
return nil, nil
}
prometheusOpts := prometheus.PrometheusOpts{
Expiration: config.TelemetryPrometheusRetentionTime,
}
sink, err := prometheus.NewPrometheusSinkFrom(prometheusOpts)
if err != nil {
return nil, err
}
return sink, nil
}
func circonusSink(config *config.RuntimeConfig, hostname string) (metrics.MetricSink, error) {
if config.TelemetryCirconusAPIToken == "" && config.TelemetryCirconusSubmissionURL == "" {
return nil, nil
}
cfg := &circonus.Config{}
cfg.Interval = config.TelemetryCirconusSubmissionInterval
cfg.CheckManager.API.TokenKey = config.TelemetryCirconusAPIToken
cfg.CheckManager.API.TokenApp = config.TelemetryCirconusAPIApp
cfg.CheckManager.API.URL = config.TelemetryCirconusAPIURL
cfg.CheckManager.Check.SubmissionURL = config.TelemetryCirconusSubmissionURL
cfg.CheckManager.Check.ID = config.TelemetryCirconusCheckID
cfg.CheckManager.Check.ForceMetricActivation = config.TelemetryCirconusCheckForceMetricActivation
cfg.CheckManager.Check.InstanceID = config.TelemetryCirconusCheckInstanceID
cfg.CheckManager.Check.SearchTag = config.TelemetryCirconusCheckSearchTag
cfg.CheckManager.Check.DisplayName = config.TelemetryCirconusCheckDisplayName
cfg.CheckManager.Check.Tags = config.TelemetryCirconusCheckTags
cfg.CheckManager.Broker.ID = config.TelemetryCirconusBrokerID
cfg.CheckManager.Broker.SelectTag = config.TelemetryCirconusBrokerSelectTag
if cfg.CheckManager.Check.DisplayName == "" {
cfg.CheckManager.Check.DisplayName = "Consul"
}
if cfg.CheckManager.API.TokenApp == "" {
cfg.CheckManager.API.TokenApp = "consul"
}
if cfg.CheckManager.Check.SearchTag == "" {
cfg.CheckManager.Check.SearchTag = "service:consul"
}
sink, err := circonus.NewCirconusSink(cfg)
if err != nil {
return nil, err
}
sink.Start()
return sink, nil
}
func startupTelemetry(conf *config.RuntimeConfig) (*metrics.InmemSink, error) {
// Setup telemetry
// Aggregate on 10 second intervals for 1 minute. Expose the
// metrics over stderr when there is a SIGUSR1 received.
memSink := metrics.NewInmemSink(10*time.Second, time.Minute)
metrics.DefaultInmemSignal(memSink)
metricsConf := metrics.DefaultConfig(conf.TelemetryMetricsPrefix)
metricsConf.EnableHostname = !conf.TelemetryDisableHostname
metricsConf.FilterDefault = conf.TelemetryFilterDefault
metricsConf.AllowedPrefixes = conf.TelemetryAllowedPrefixes
metricsConf.BlockedPrefixes = conf.TelemetryBlockedPrefixes
var sinks metrics.FanoutSink
addSink := func(name string, fn func(*config.RuntimeConfig, string) (metrics.MetricSink, error)) error {
s, err := fn(conf, metricsConf.HostName)
if err != nil {
return err
}
if s != nil {
sinks = append(sinks, s)
}
return nil
}
if err := addSink("statsite", statsiteSink); err != nil {
return nil, err
}
if err := addSink("statsd", statsdSink); err != nil {
return nil, err
}
if err := addSink("dogstatd", dogstatdSink); err != nil {
return nil, err
}
if err := addSink("circonus", circonusSink); err != nil {
return nil, err
}
if err := addSink("prometheus", prometheusSink); err != nil {
return nil, err
}
if len(sinks) > 0 {
sinks = append(sinks, memSink)
metrics.NewGlobal(metricsConf, sinks)
} else {
metricsConf.EnableHostname = false
metrics.NewGlobal(metricsConf, memSink)
}
return memSink, nil
}
func (c *cmd) run(args []string) int {
// Parse our configs
c.args = args
config := c.readConfig()
if config == nil {
return 1
}
// Setup the log outputs
logConfig := &logger.Config{
LogLevel: config.LogLevel,
EnableSyslog: config.EnableSyslog,
SyslogFacility: config.SyslogFacility,
}
logFilter, logGate, logWriter, logOutput, ok := logger.Setup(logConfig, c.UI)
if !ok {
return 1
}
c.logFilter = logFilter
c.logOutput = logOutput
c.logger = log.New(logOutput, "", log.LstdFlags)
memSink, err := startupTelemetry(config)
if err != nil {
c.UI.Error(err.Error())
return 1
}
// Create the agent
c.UI.Output("Starting Consul agent...")
agent, err := agent.New(config)
if err != nil {
c.UI.Error(fmt.Sprintf("Error creating agent: %s", err))
return 1
}
agent.LogOutput = logOutput
agent.LogWriter = logWriter
agent.MemSink = memSink
if err := agent.Start(); err != nil {
c.UI.Error(fmt.Sprintf("Error starting agent: %s", err))
return 1
}
// shutdown agent before endpoints
defer agent.ShutdownEndpoints()
defer agent.ShutdownAgent()
if !config.DisableUpdateCheck {
c.startupUpdateCheck(config)
}
if err := c.startupJoin(agent, config); err != nil {
c.UI.Error(err.Error())
return 1
}
if err := c.startupJoinWan(agent, config); err != nil {
c.UI.Error(err.Error())
return 1
}
// Let the agent know we've finished registration
agent.StartSync()
segment := config.SegmentName
if config.ServerMode {
segment = "<all>"
}
c.UI.Output("Consul agent running!")
c.UI.Info(fmt.Sprintf(" Version: '%s'", c.versionHuman))
c.UI.Info(fmt.Sprintf(" Node ID: '%s'", config.NodeID))
c.UI.Info(fmt.Sprintf(" Node name: '%s'", config.NodeName))
c.UI.Info(fmt.Sprintf(" Datacenter: '%s' (Segment: '%s')", config.Datacenter, segment))
c.UI.Info(fmt.Sprintf(" Server: %v (Bootstrap: %v)", config.ServerMode, config.Bootstrap))
c.UI.Info(fmt.Sprintf(" Client Addr: %v (HTTP: %d, HTTPS: %d, DNS: %d)", config.ClientAddrs,
config.HTTPPort, config.HTTPSPort, config.DNSPort))
c.UI.Info(fmt.Sprintf(" Cluster Addr: %v (LAN: %d, WAN: %d)", config.AdvertiseAddrLAN,
config.SerfPortLAN, config.SerfPortWAN))
c.UI.Info(fmt.Sprintf(" Encrypt: Gossip: %v, TLS-Outgoing: %v, TLS-Incoming: %v",
agent.GossipEncrypted(), config.VerifyOutgoing, config.VerifyIncoming))
// Enable log streaming
c.UI.Info("")
c.UI.Output("Log data will now stream in as it occurs:\n")
logGate.Flush()
// wait for signal
signalCh := make(chan os.Signal, 10)
signal.Notify(signalCh, os.Interrupt, syscall.SIGTERM, syscall.SIGHUP, syscall.SIGPIPE)
for {
var sig os.Signal
var reloadErrCh chan error
select {
case s := <-signalCh:
sig = s
case ch := <-agent.ReloadCh():
sig = syscall.SIGHUP
reloadErrCh = ch
case <-c.shutdownCh:
sig = os.Interrupt
case err := <-agent.RetryJoinCh():
c.logger.Println("[ERR] agent: Retry join failed: ", err)
return 1
case <-agent.ShutdownCh():
// agent is already down!
return 0
}
switch sig {
case syscall.SIGPIPE:
continue
case syscall.SIGHUP:
c.logger.Println("[INFO] agent: Caught signal: ", sig)
conf, err := c.handleReload(agent, config)
if conf != nil {
config = conf
}
if err != nil {
c.logger.Println("[ERR] agent: Reload config failed: ", err)
}
// Send result back if reload was called via HTTP
if reloadErrCh != nil {
reloadErrCh <- err
}
default:
c.logger.Println("[INFO] agent: Caught signal: ", sig)
graceful := (sig == os.Interrupt && !(config.SkipLeaveOnInt)) || (sig == syscall.SIGTERM && (config.LeaveOnTerm))
if !graceful {
c.logger.Println("[INFO] agent: Graceful shutdown disabled. Exiting")
return 1
}
c.logger.Println("[INFO] agent: Gracefully shutting down agent...")
gracefulCh := make(chan struct{})
go func() {
if err := agent.Leave(); err != nil {
c.logger.Println("[ERR] agent: Error on leave:", err)
return
}
close(gracefulCh)
}()
gracefulTimeout := 15 * time.Second
select {
case <-signalCh:
c.logger.Printf("[INFO] agent: Caught second signal %v. Exiting\n", sig)
return 1
case <-time.After(gracefulTimeout):
c.logger.Println("[INFO] agent: Timeout on graceful leave. Exiting")
return 1
case <-gracefulCh:
c.logger.Println("[INFO] agent: Graceful exit completed")
return 0
}
}
}
}
// handleReload is invoked when we should reload our configs, e.g. SIGHUP
func (c *cmd) handleReload(agent *agent.Agent, cfg *config.RuntimeConfig) (*config.RuntimeConfig, error) {
c.logger.Println("[INFO] agent: Reloading configuration...")
var errs error
newCfg := c.readConfig()
if newCfg == nil {
errs = multierror.Append(errs, fmt.Errorf("Failed to reload configs"))
return cfg, errs
}
// Change the log level
minLevel := logutils.LogLevel(strings.ToUpper(newCfg.LogLevel))
if logger.ValidateLevelFilter(minLevel, c.logFilter) {
c.logFilter.SetMinLevel(minLevel)
} else {
errs = multierror.Append(fmt.Errorf(
"Invalid log level: %s. Valid log levels are: %v",
minLevel, c.logFilter.Levels))
// Keep the current log level
newCfg.LogLevel = cfg.LogLevel
}
if err := agent.ReloadConfig(newCfg); err != nil {
errs = multierror.Append(fmt.Errorf(
"Failed to reload configs: %v", err))
}
return cfg, errs
}
func (c *cmd) Synopsis() string {
return synopsis
}
func (c *cmd) Help() string {
return c.help
}
const synopsis = "Runs a Consul agent"
const help = `
Usage: consul agent [options]
Starts the Consul agent and runs until an interrupt is received. The
agent represents a single node in a cluster.
`