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agent.go
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agent.go
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// Copyright 2014-2015 Amazon.com, Inc. or its affiliates. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License"). You may
// not use this file except in compliance with the License. A copy of the
// License is located at
//
// http://aws.amazon.com/apache2.0/
//
// or in the "license" file accompanying this file. This file is distributed
// on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
// express or implied. See the License for the specific language governing
// permissions and limitations under the License.
package main
import (
"flag"
"fmt"
mathrand "math/rand"
"os"
"runtime"
"time"
acshandler "github.com/aws/amazon-ecs-agent/agent/acs/handler"
"github.com/aws/amazon-ecs-agent/agent/api"
"github.com/aws/amazon-ecs-agent/agent/config"
"github.com/aws/amazon-ecs-agent/agent/ec2"
"github.com/aws/amazon-ecs-agent/agent/engine"
"github.com/aws/amazon-ecs-agent/agent/eventhandler"
"github.com/aws/amazon-ecs-agent/agent/handlers"
"github.com/aws/amazon-ecs-agent/agent/httpclient"
"github.com/aws/amazon-ecs-agent/agent/logger"
"github.com/aws/amazon-ecs-agent/agent/sighandlers"
"github.com/aws/amazon-ecs-agent/agent/sighandlers/exitcodes"
"github.com/aws/amazon-ecs-agent/agent/statemanager"
"github.com/aws/amazon-ecs-agent/agent/tcs/handler"
"github.com/aws/amazon-ecs-agent/agent/utils"
utilatomic "github.com/aws/amazon-ecs-agent/agent/utils/atomic"
"github.com/aws/amazon-ecs-agent/agent/version"
"github.com/aws/aws-sdk-go/aws/awserr"
"github.com/aws/aws-sdk-go/aws/defaults"
log "github.com/cihub/seelog"
"golang.org/x/net/context"
)
func init() {
runtime.GOMAXPROCS(1)
mathrand.Seed(time.Now().UnixNano())
}
func main() {
// Use a returning main instead of os.Exiting main to allow defers to run
// before exit
os.Exit(_main())
}
func _main() int {
defer log.Flush()
flagset := flag.NewFlagSet("Amazon ECS Agent", flag.ContinueOnError)
versionFlag := flagset.Bool("version", false, "Print the agent version information and exit")
logLevel := flagset.String("loglevel", "", "Loglevel: [<crit>|<error>|<warn>|<info>|<debug>]")
acceptInsecureCert := flagset.Bool("k", false, "Disable SSL certificate verification. We do not recommend setting this option.")
licenseFlag := flagset.Bool("license", false, "Print the LICENSE and NOTICE files and exit")
blackholeEc2Metadata := flagset.Bool("blackhole-ec2-metadata", false, "Blackhole the EC2 Metadata requests. Setting this option can cause the ECS Agent to fail to work properly. We do not recommend setting this option")
err := flagset.Parse(os.Args[1:])
if err != nil {
return exitcodes.ExitTerminal
}
if *licenseFlag {
license := utils.NewLicenseProvider()
text, err := license.GetText()
if err != nil {
fmt.Fprintln(os.Stderr, err)
return exitcodes.ExitError
}
fmt.Println(text)
return exitcodes.ExitSuccess
}
logger.SetLevel(*logLevel)
ec2MetadataClient := ec2.DefaultClient
if *blackholeEc2Metadata {
ec2MetadataClient = ec2.NewBlackholeEC2MetadataClient()
}
log.Infof("Starting Agent: %v", version.String())
log.Info("Loading configuration")
cfg, err := config.NewConfig(ec2MetadataClient)
// Load cfg before doing 'versionFlag' so that it has the DOCKER_HOST
// variable loaded if needed
if *versionFlag {
versionableEngine := engine.NewTaskEngine(cfg)
version.PrintVersion(versionableEngine)
return exitcodes.ExitSuccess
}
sighandlers.StartDebugHandler()
ctx := context.Background()
if err != nil {
log.Criticalf("Error loading config: %v", err)
// All required config values can be inferred from EC2 Metadata, so this error could be transient.
return exitcodes.ExitError
}
log.Debug("Loaded config: " + cfg.String())
var currentEc2InstanceID, containerInstanceArn string
var taskEngine engine.TaskEngine
if cfg.Checkpoint {
log.Info("Checkpointing is enabled. Attempting to load state")
var previousCluster, previousEc2InstanceID, previousContainerInstanceArn string
previousTaskEngine := engine.NewTaskEngine(cfg)
// previousState is used to verify that our current runtime configuration is
// compatible with our past configuration as reflected by our state-file
previousState, err := initializeStateManager(cfg, previousTaskEngine, &previousCluster, &previousContainerInstanceArn, &previousEc2InstanceID, acshandler.SequenceNumber)
if err != nil {
log.Criticalf("Error creating state manager: %v", err)
return exitcodes.ExitTerminal
}
err = previousState.Load()
if err != nil {
log.Criticalf("Error loading previously saved state: %v", err)
return exitcodes.ExitTerminal
}
if previousCluster != "" {
// TODO Handle default cluster in a sane and unified way across the codebase
configuredCluster := cfg.Cluster
if configuredCluster == "" {
log.Debug("Setting cluster to default; none configured")
configuredCluster = config.DEFAULT_CLUSTER_NAME
}
if previousCluster != configuredCluster {
log.Criticalf("Data mismatch; saved cluster '%v' does not match configured cluster '%v'. Perhaps you want to delete the configured checkpoint file?", previousCluster, configuredCluster)
return exitcodes.ExitTerminal
}
cfg.Cluster = previousCluster
log.Infof("Restored cluster '%v'", cfg.Cluster)
}
if instanceIdentityDoc, err := ec2MetadataClient.InstanceIdentityDocument(); err == nil {
currentEc2InstanceID = instanceIdentityDoc.InstanceId
} else {
log.Criticalf("Unable to access EC2 Metadata service to determine EC2 ID: %v", err)
}
if previousEc2InstanceID != "" && previousEc2InstanceID != currentEc2InstanceID {
log.Warnf("Data mismatch; saved InstanceID '%v' does not match current InstanceID '%v'. Overwriting old datafile", previousEc2InstanceID, currentEc2InstanceID)
// Reset taskEngine; all the other values are still default
taskEngine = engine.NewTaskEngine(cfg)
} else {
// Use the values we loaded if there's no issue
containerInstanceArn = previousContainerInstanceArn
taskEngine = previousTaskEngine
}
} else {
log.Info("Checkpointing not enabled; a new container instance will be created each time the agent is run")
taskEngine = engine.NewTaskEngine(cfg)
}
stateManager, err := initializeStateManager(cfg, taskEngine, &cfg.Cluster, &containerInstanceArn, ¤tEc2InstanceID, acshandler.SequenceNumber)
if err != nil {
log.Criticalf("Error creating state manager: %v", err)
return exitcodes.ExitTerminal
}
capabilities := taskEngine.Capabilities()
credentialProvider := defaults.DefaultChainCredentials
// Preflight request to make sure they're good
if preflightCreds, err := credentialProvider.Get(); err != nil || preflightCreds.AccessKeyID == "" {
log.Warnf("Error getting valid credentials (AKID %v): %v", preflightCreds.AccessKeyID, err)
}
client := api.NewECSClient(credentialProvider, cfg, httpclient.New(api.RoundtripTimeout, *acceptInsecureCert), ec2MetadataClient)
if containerInstanceArn == "" {
log.Info("Registering Instance with ECS")
containerInstanceArn, err = client.RegisterContainerInstance("", capabilities)
if err != nil {
log.Errorf("Error registering: %v", err)
if retriable, ok := err.(utils.Retriable); ok && !retriable.Retry() {
return exitcodes.ExitTerminal
}
return exitcodes.ExitError
}
log.Infof("Registration completed successfully. I am running as '%v' in cluster '%v'", containerInstanceArn, cfg.Cluster)
// Save our shiny new containerInstanceArn
stateManager.Save()
} else {
log.Infof("Restored from checkpoint file. I am running as '%v' in cluster '%v'", containerInstanceArn, cfg.Cluster)
_, err = client.RegisterContainerInstance(containerInstanceArn, capabilities)
if err != nil {
log.Errorf("Error re-registering: %v", err)
if awserr, ok := err.(awserr.Error); ok && api.IsInstanceTypeChangedError(awserr) {
log.Criticalf("The current instance type does not match the registered instance type. Please revert the instance type change, or alternatively launch a new instance. Error: %v", err)
return exitcodes.ExitTerminal
}
return exitcodes.ExitError
}
}
// Begin listening to the docker daemon and saving changes
taskEngine.SetSaver(stateManager)
taskEngine.MustInit()
go sighandlers.StartTerminationHandler(stateManager, taskEngine)
// Agent introspection api
go handlers.ServeHttp(&containerInstanceArn, taskEngine, cfg)
// Start sending events to the backend
go eventhandler.HandleEngineEvents(taskEngine, client, stateManager)
telemetrySessionParams := tcshandler.TelemetrySessionParams{
ContainerInstanceArn: containerInstanceArn,
CredentialProvider: credentialProvider,
Cfg: cfg,
AcceptInvalidCert: *acceptInsecureCert,
EcsClient: client,
TaskEngine: taskEngine,
}
// Start metrics session in a go routine
go tcshandler.StartMetricsSession(telemetrySessionParams)
log.Info("Beginning Polling for updates")
err = acshandler.StartSession(ctx, acshandler.StartSessionArguments{
AcceptInvalidCert: *acceptInsecureCert,
Config: cfg,
ContainerInstanceArn: containerInstanceArn,
CredentialProvider: credentialProvider,
ECSClient: client,
StateManager: stateManager,
TaskEngine: taskEngine,
})
if err != nil {
log.Criticalf("Unretriable error starting communicating with ACS: %v", err)
return exitcodes.ExitTerminal
}
log.Critical("ACS Session handler should never exit")
return exitcodes.ExitError
}
func initializeStateManager(cfg *config.Config, taskEngine engine.TaskEngine, cluster, containerInstanceArn, savedInstanceID *string, sequenceNumber *utilatomic.IncreasingInt64) (statemanager.StateManager, error) {
if !cfg.Checkpoint {
return statemanager.NewNoopStateManager(), nil
}
stateManager, err := statemanager.NewStateManager(cfg,
statemanager.AddSaveable("TaskEngine", taskEngine),
statemanager.AddSaveable("ContainerInstanceArn", containerInstanceArn),
statemanager.AddSaveable("Cluster", cluster),
statemanager.AddSaveable("EC2InstanceID", savedInstanceID),
statemanager.AddSaveable("ACSSeqNum", sequenceNumber),
)
if err != nil {
return nil, err
}
return stateManager, nil
}