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aws.go
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aws.go
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/*
Copyright 2014 The Kubernetes Authors 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.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License 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 aws
import (
"errors"
"fmt"
"io"
"net"
"net/url"
"os"
"regexp"
"strings"
"sync"
"time"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/awserr"
"github.com/aws/aws-sdk-go/aws/credentials"
"github.com/aws/aws-sdk-go/aws/credentials/ec2rolecreds"
"github.com/aws/aws-sdk-go/aws/ec2metadata"
"github.com/aws/aws-sdk-go/aws/request"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/autoscaling"
"github.com/aws/aws-sdk-go/service/ec2"
"github.com/aws/aws-sdk-go/service/elb"
"github.com/scalingdata/gcfg"
"k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/cloudprovider"
"k8s.io/kubernetes/pkg/credentialprovider/aws"
"k8s.io/kubernetes/pkg/types"
"github.com/golang/glog"
"k8s.io/kubernetes/pkg/api/service"
"k8s.io/kubernetes/pkg/api/unversioned"
)
const ProviderName = "aws"
// The tag name we use to differentiate multiple logically independent clusters running in the same AZ
const TagNameKubernetesCluster = "KubernetesCluster"
// The tag name we use to differentiate multiple services. Used currently for ELBs only.
const TagNameKubernetesService = "kubernetes.io/service-name"
// The tag name used on a subnet to designate that it should be used for internal ELBs
const TagNameSubnetInternalELB = "kubernetes.io/role/internal-elb"
// The tag name used on a subnet to designate that it should be used for internet ELBs
const TagNameSubnetPublicELB = "kubernetes.io/role/elb"
// Annotation used on the service to indicate that we want an internal ELB.
// Currently we accept only the value "0.0.0.0/0" - other values are an error.
// This lets us define more advanced semantics in future.
const ServiceAnnotationLoadBalancerInternal = "service.beta.kubernetes.io/aws-load-balancer-internal"
// We sometimes read to see if something exists; then try to create it if we didn't find it
// This can fail once in a consistent system if done in parallel
// In an eventually consistent system, it could fail unboundedly
// MaxReadThenCreateRetries sets the maximum number of attempts we will make
const MaxReadThenCreateRetries = 30
// Default volume type for newly created Volumes
// TODO: Remove when user/admin can configure volume types and thus we don't
// need hardcoded defaults.
const DefaultVolumeType = "gp2"
// Amazon recommends having no more that 40 volumes attached to an instance,
// and at least one of those is for the system root volume.
// See http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/volume_limits.html#linux-specific-volume-limits
const DefaultMaxEBSVolumes = 39
// Used to call aws_credentials.Init() just once
var once sync.Once
// Abstraction over AWS, to allow mocking/other implementations
type AWSServices interface {
Compute(region string) (EC2, error)
LoadBalancing(region string) (ELB, error)
Autoscaling(region string) (ASG, error)
Metadata() (EC2Metadata, error)
}
// TODO: Should we rename this to AWS (EBS & ELB are not technically part of EC2)
// Abstraction over EC2, to allow mocking/other implementations
// Note that the DescribeX functions return a list, so callers don't need to deal with paging
type EC2 interface {
// Query EC2 for instances matching the filter
DescribeInstances(request *ec2.DescribeInstancesInput) ([]*ec2.Instance, error)
// Attach a volume to an instance
AttachVolume(*ec2.AttachVolumeInput) (*ec2.VolumeAttachment, error)
// Detach a volume from an instance it is attached to
DetachVolume(request *ec2.DetachVolumeInput) (resp *ec2.VolumeAttachment, err error)
// Lists volumes
DescribeVolumes(request *ec2.DescribeVolumesInput) ([]*ec2.Volume, error)
// Create an EBS volume
CreateVolume(request *ec2.CreateVolumeInput) (resp *ec2.Volume, err error)
// Delete an EBS volume
DeleteVolume(*ec2.DeleteVolumeInput) (*ec2.DeleteVolumeOutput, error)
DescribeSecurityGroups(request *ec2.DescribeSecurityGroupsInput) ([]*ec2.SecurityGroup, error)
CreateSecurityGroup(*ec2.CreateSecurityGroupInput) (*ec2.CreateSecurityGroupOutput, error)
DeleteSecurityGroup(request *ec2.DeleteSecurityGroupInput) (*ec2.DeleteSecurityGroupOutput, error)
AuthorizeSecurityGroupIngress(*ec2.AuthorizeSecurityGroupIngressInput) (*ec2.AuthorizeSecurityGroupIngressOutput, error)
RevokeSecurityGroupIngress(*ec2.RevokeSecurityGroupIngressInput) (*ec2.RevokeSecurityGroupIngressOutput, error)
DescribeSubnets(*ec2.DescribeSubnetsInput) ([]*ec2.Subnet, error)
CreateTags(*ec2.CreateTagsInput) (*ec2.CreateTagsOutput, error)
DescribeRouteTables(request *ec2.DescribeRouteTablesInput) ([]*ec2.RouteTable, error)
CreateRoute(request *ec2.CreateRouteInput) (*ec2.CreateRouteOutput, error)
DeleteRoute(request *ec2.DeleteRouteInput) (*ec2.DeleteRouteOutput, error)
ModifyInstanceAttribute(request *ec2.ModifyInstanceAttributeInput) (*ec2.ModifyInstanceAttributeOutput, error)
}
// This is a simple pass-through of the ELB client interface, which allows for testing
type ELB interface {
CreateLoadBalancer(*elb.CreateLoadBalancerInput) (*elb.CreateLoadBalancerOutput, error)
DeleteLoadBalancer(*elb.DeleteLoadBalancerInput) (*elb.DeleteLoadBalancerOutput, error)
DescribeLoadBalancers(*elb.DescribeLoadBalancersInput) (*elb.DescribeLoadBalancersOutput, error)
RegisterInstancesWithLoadBalancer(*elb.RegisterInstancesWithLoadBalancerInput) (*elb.RegisterInstancesWithLoadBalancerOutput, error)
DeregisterInstancesFromLoadBalancer(*elb.DeregisterInstancesFromLoadBalancerInput) (*elb.DeregisterInstancesFromLoadBalancerOutput, error)
DetachLoadBalancerFromSubnets(*elb.DetachLoadBalancerFromSubnetsInput) (*elb.DetachLoadBalancerFromSubnetsOutput, error)
AttachLoadBalancerToSubnets(*elb.AttachLoadBalancerToSubnetsInput) (*elb.AttachLoadBalancerToSubnetsOutput, error)
CreateLoadBalancerListeners(*elb.CreateLoadBalancerListenersInput) (*elb.CreateLoadBalancerListenersOutput, error)
DeleteLoadBalancerListeners(*elb.DeleteLoadBalancerListenersInput) (*elb.DeleteLoadBalancerListenersOutput, error)
ApplySecurityGroupsToLoadBalancer(*elb.ApplySecurityGroupsToLoadBalancerInput) (*elb.ApplySecurityGroupsToLoadBalancerOutput, error)
ConfigureHealthCheck(*elb.ConfigureHealthCheckInput) (*elb.ConfigureHealthCheckOutput, error)
}
// This is a simple pass-through of the Autoscaling client interface, which allows for testing
type ASG interface {
UpdateAutoScalingGroup(*autoscaling.UpdateAutoScalingGroupInput) (*autoscaling.UpdateAutoScalingGroupOutput, error)
DescribeAutoScalingGroups(*autoscaling.DescribeAutoScalingGroupsInput) (*autoscaling.DescribeAutoScalingGroupsOutput, error)
}
// Abstraction over the AWS metadata service
type EC2Metadata interface {
// Query the EC2 metadata service (used to discover instance-id etc)
GetMetadata(path string) (string, error)
}
type VolumeOptions struct {
CapacityGB int
Tags map[string]string
}
// Volumes is an interface for managing cloud-provisioned volumes
// TODO: Allow other clouds to implement this
type Volumes interface {
// Attach the disk to the specified instance
// instanceName can be empty to mean "the instance on which we are running"
// Returns the device (e.g. /dev/xvdf) where we attached the volume
AttachDisk(diskName string, instanceName string, readOnly bool) (string, error)
// Detach the disk from the specified instance
// instanceName can be empty to mean "the instance on which we are running"
// Returns the device where the volume was attached
DetachDisk(diskName string, instanceName string) (string, error)
// Create a volume with the specified options
CreateDisk(volumeOptions *VolumeOptions) (volumeName string, err error)
// Delete the specified volume
// Returns true iff the volume was deleted
// If the was not found, returns (false, nil)
DeleteDisk(volumeName string) (bool, error)
// Get labels to apply to volume on creation
GetVolumeLabels(volumeName string) (map[string]string, error)
}
// InstanceGroups is an interface for managing cloud-managed instance groups / autoscaling instance groups
// TODO: Allow other clouds to implement this
type InstanceGroups interface {
// Set the size to the fixed size
ResizeInstanceGroup(instanceGroupName string, size int) error
// Queries the cloud provider for information about the specified instance group
DescribeInstanceGroup(instanceGroupName string) (InstanceGroupInfo, error)
}
// InstanceGroupInfo is returned by InstanceGroups.Describe, and exposes information about the group.
type InstanceGroupInfo interface {
// The number of instances currently running under control of this group
CurrentSize() (int, error)
}
// AWSCloud is an implementation of Interface, LoadBalancer and Instances for Amazon Web Services.
type AWSCloud struct {
ec2 EC2
elb ELB
asg ASG
metadata EC2Metadata
cfg *AWSCloudConfig
region string
vpcID string
filterTags map[string]string
// The AWS instance that we are running on
// Note that we cache some state in awsInstance (mountpoints), so we must preserve the instance
selfAWSInstance *awsInstance
mutex sync.Mutex
}
var _ Volumes = &AWSCloud{}
type AWSCloudConfig struct {
Global struct {
// TODO: Is there any use for this? We can get it from the instance metadata service
// Maybe if we're not running on AWS, e.g. bootstrap; for now it is not very useful
Zone string
KubernetesClusterTag string
//The aws provider creates an inbound rule per load balancer on the node security
//group. However, this can run into the AWS security group rule limit of 50 if
//many LoadBalancers are created.
//
//This flag disables the automatic ingress creation. It requires that the user
//has setup a rule that allows inbound traffic on kubelet ports from the
//local VPC subnet (so load balancers can access it). E.g. 10.82.0.0/16 30000-32000.
DisableSecurityGroupIngress bool
}
}
// awsSdkEC2 is an implementation of the EC2 interface, backed by aws-sdk-go
type awsSdkEC2 struct {
ec2 *ec2.EC2
}
type awsSDKProvider struct {
creds *credentials.Credentials
mutex sync.Mutex
regionDelayers map[string]*CrossRequestRetryDelay
}
func newAWSSDKProvider(creds *credentials.Credentials) *awsSDKProvider {
return &awsSDKProvider{
creds: creds,
regionDelayers: make(map[string]*CrossRequestRetryDelay),
}
}
func (p *awsSDKProvider) addHandlers(regionName string, h *request.Handlers) {
h.Sign.PushFrontNamed(request.NamedHandler{
Name: "k8s/logger",
Fn: awsHandlerLogger,
})
delayer := p.getCrossRequestRetryDelay(regionName)
if delayer != nil {
h.Sign.PushFrontNamed(request.NamedHandler{
Name: "k8s/delay-presign",
Fn: delayer.BeforeSign,
})
h.AfterRetry.PushFrontNamed(request.NamedHandler{
Name: "k8s/delay-afterretry",
Fn: delayer.AfterRetry,
})
}
}
// Get a CrossRequestRetryDelay, scoped to the region, not to the request.
// This means that when we hit a limit on a call, we will delay _all_ calls to the API.
// We do this to protect the AWS account from becoming overloaded and effectively locked.
// We also log when we hit request limits.
// Note that this delays the current goroutine; this is bad behaviour and will
// likely cause k8s to become slow or unresponsive for cloud operations.
// However, this throttle is intended only as a last resort. When we observe
// this throttling, we need to address the root cause (e.g. add a delay to a
// controller retry loop)
func (p *awsSDKProvider) getCrossRequestRetryDelay(regionName string) *CrossRequestRetryDelay {
p.mutex.Lock()
defer p.mutex.Unlock()
delayer, found := p.regionDelayers[regionName]
if !found {
delayer = NewCrossRequestRetryDelay()
p.regionDelayers[regionName] = delayer
}
return delayer
}
func (p *awsSDKProvider) Compute(regionName string) (EC2, error) {
service := ec2.New(session.New(&aws.Config{
Region: ®ionName,
Credentials: p.creds,
}))
p.addHandlers(regionName, &service.Handlers)
ec2 := &awsSdkEC2{
ec2: service,
}
return ec2, nil
}
func (p *awsSDKProvider) LoadBalancing(regionName string) (ELB, error) {
elbClient := elb.New(session.New(&aws.Config{
Region: ®ionName,
Credentials: p.creds,
}))
p.addHandlers(regionName, &elbClient.Handlers)
return elbClient, nil
}
func (p *awsSDKProvider) Autoscaling(regionName string) (ASG, error) {
client := autoscaling.New(session.New(&aws.Config{
Region: ®ionName,
Credentials: p.creds,
}))
p.addHandlers(regionName, &client.Handlers)
return client, nil
}
func (p *awsSDKProvider) Metadata() (EC2Metadata, error) {
client := ec2metadata.New(session.New(&aws.Config{}))
return client, nil
}
func stringPointerArray(orig []string) []*string {
if orig == nil {
return nil
}
n := make([]*string, len(orig))
for i := range orig {
n[i] = &orig[i]
}
return n
}
func isNilOrEmpty(s *string) bool {
return s == nil || *s == ""
}
func orEmpty(s *string) string {
if s == nil {
return ""
}
return *s
}
func newEc2Filter(name string, value string) *ec2.Filter {
filter := &ec2.Filter{
Name: aws.String(name),
Values: []*string{
aws.String(value),
},
}
return filter
}
func (self *AWSCloud) AddSSHKeyToAllInstances(user string, keyData []byte) error {
return errors.New("unimplemented")
}
func (c *AWSCloud) CurrentNodeName(hostname string) (string, error) {
return c.selfAWSInstance.nodeName, nil
}
// Implementation of EC2.Instances
func (self *awsSdkEC2) DescribeInstances(request *ec2.DescribeInstancesInput) ([]*ec2.Instance, error) {
// Instances are paged
results := []*ec2.Instance{}
var nextToken *string
for {
response, err := self.ec2.DescribeInstances(request)
if err != nil {
return nil, fmt.Errorf("error listing AWS instances: %v", err)
}
for _, reservation := range response.Reservations {
results = append(results, reservation.Instances...)
}
nextToken = response.NextToken
if isNilOrEmpty(nextToken) {
break
}
request.NextToken = nextToken
}
return results, nil
}
// Implements EC2.DescribeSecurityGroups
func (s *awsSdkEC2) DescribeSecurityGroups(request *ec2.DescribeSecurityGroupsInput) ([]*ec2.SecurityGroup, error) {
// Security groups are not paged
response, err := s.ec2.DescribeSecurityGroups(request)
if err != nil {
return nil, fmt.Errorf("error listing AWS security groups: %v", err)
}
return response.SecurityGroups, nil
}
func (s *awsSdkEC2) AttachVolume(request *ec2.AttachVolumeInput) (*ec2.VolumeAttachment, error) {
return s.ec2.AttachVolume(request)
}
func (s *awsSdkEC2) DetachVolume(request *ec2.DetachVolumeInput) (*ec2.VolumeAttachment, error) {
return s.ec2.DetachVolume(request)
}
func (s *awsSdkEC2) DescribeVolumes(request *ec2.DescribeVolumesInput) ([]*ec2.Volume, error) {
// Volumes are paged
results := []*ec2.Volume{}
var nextToken *string
for {
response, err := s.ec2.DescribeVolumes(request)
if err != nil {
return nil, fmt.Errorf("error listing AWS volumes: %v", err)
}
results = append(results, response.Volumes...)
nextToken = response.NextToken
if isNilOrEmpty(nextToken) {
break
}
request.NextToken = nextToken
}
return results, nil
}
func (s *awsSdkEC2) CreateVolume(request *ec2.CreateVolumeInput) (resp *ec2.Volume, err error) {
return s.ec2.CreateVolume(request)
}
func (s *awsSdkEC2) DeleteVolume(request *ec2.DeleteVolumeInput) (*ec2.DeleteVolumeOutput, error) {
return s.ec2.DeleteVolume(request)
}
func (s *awsSdkEC2) DescribeSubnets(request *ec2.DescribeSubnetsInput) ([]*ec2.Subnet, error) {
// Subnets are not paged
response, err := s.ec2.DescribeSubnets(request)
if err != nil {
return nil, fmt.Errorf("error listing AWS subnets: %v", err)
}
return response.Subnets, nil
}
func (s *awsSdkEC2) CreateSecurityGroup(request *ec2.CreateSecurityGroupInput) (*ec2.CreateSecurityGroupOutput, error) {
return s.ec2.CreateSecurityGroup(request)
}
func (s *awsSdkEC2) DeleteSecurityGroup(request *ec2.DeleteSecurityGroupInput) (*ec2.DeleteSecurityGroupOutput, error) {
return s.ec2.DeleteSecurityGroup(request)
}
func (s *awsSdkEC2) AuthorizeSecurityGroupIngress(request *ec2.AuthorizeSecurityGroupIngressInput) (*ec2.AuthorizeSecurityGroupIngressOutput, error) {
return s.ec2.AuthorizeSecurityGroupIngress(request)
}
func (s *awsSdkEC2) RevokeSecurityGroupIngress(request *ec2.RevokeSecurityGroupIngressInput) (*ec2.RevokeSecurityGroupIngressOutput, error) {
return s.ec2.RevokeSecurityGroupIngress(request)
}
func (s *awsSdkEC2) CreateTags(request *ec2.CreateTagsInput) (*ec2.CreateTagsOutput, error) {
return s.ec2.CreateTags(request)
}
func (s *awsSdkEC2) DescribeRouteTables(request *ec2.DescribeRouteTablesInput) ([]*ec2.RouteTable, error) {
// Not paged
response, err := s.ec2.DescribeRouteTables(request)
if err != nil {
return nil, fmt.Errorf("error listing AWS route tables: %v", err)
}
return response.RouteTables, nil
}
func (s *awsSdkEC2) CreateRoute(request *ec2.CreateRouteInput) (*ec2.CreateRouteOutput, error) {
return s.ec2.CreateRoute(request)
}
func (s *awsSdkEC2) DeleteRoute(request *ec2.DeleteRouteInput) (*ec2.DeleteRouteOutput, error) {
return s.ec2.DeleteRoute(request)
}
func (s *awsSdkEC2) ModifyInstanceAttribute(request *ec2.ModifyInstanceAttributeInput) (*ec2.ModifyInstanceAttributeOutput, error) {
return s.ec2.ModifyInstanceAttribute(request)
}
func init() {
cloudprovider.RegisterCloudProvider(ProviderName, func(config io.Reader) (cloudprovider.Interface, error) {
creds := credentials.NewChainCredentials(
[]credentials.Provider{
&credentials.EnvProvider{},
&ec2rolecreds.EC2RoleProvider{
Client: ec2metadata.New(session.New(&aws.Config{})),
},
&credentials.SharedCredentialsProvider{},
})
aws := newAWSSDKProvider(creds)
return newAWSCloud(config, aws)
})
}
// readAWSCloudConfig reads an instance of AWSCloudConfig from config reader.
func readAWSCloudConfig(config io.Reader, metadata EC2Metadata) (*AWSCloudConfig, error) {
var cfg AWSCloudConfig
var err error
if config != nil {
err = gcfg.ReadInto(&cfg, config)
if err != nil {
return nil, err
}
}
if cfg.Global.Zone == "" {
if metadata != nil {
glog.Info("Zone not specified in configuration file; querying AWS metadata service")
cfg.Global.Zone, err = getAvailabilityZone(metadata)
if err != nil {
return nil, err
}
}
if cfg.Global.Zone == "" {
return nil, fmt.Errorf("no zone specified in configuration file")
}
}
return &cfg, nil
}
func getInstanceType(metadata EC2Metadata) (string, error) {
return metadata.GetMetadata("instance-type")
}
func getAvailabilityZone(metadata EC2Metadata) (string, error) {
return metadata.GetMetadata("placement/availability-zone")
}
func isRegionValid(region string) bool {
regions := [...]string{
"us-east-1",
"us-west-1",
"us-west-2",
"eu-west-1",
"eu-central-1",
"ap-southeast-1",
"ap-southeast-2",
"ap-northeast-1",
"cn-north-1",
"us-gov-west-1",
"sa-east-1",
}
for _, r := range regions {
if r == region {
return true
}
}
return false
}
// Derives the region from a valid az name.
// Returns an error if the az is known invalid (empty)
func azToRegion(az string) (string, error) {
if len(az) < 1 {
return "", fmt.Errorf("invalid (empty) AZ")
}
region := az[:len(az)-1]
return region, nil
}
// newAWSCloud creates a new instance of AWSCloud.
// AWSProvider and instanceId are primarily for tests
func newAWSCloud(config io.Reader, awsServices AWSServices) (*AWSCloud, error) {
metadata, err := awsServices.Metadata()
if err != nil {
return nil, fmt.Errorf("error creating AWS metadata client: %v", err)
}
cfg, err := readAWSCloudConfig(config, metadata)
if err != nil {
return nil, fmt.Errorf("unable to read AWS cloud provider config file: %v", err)
}
zone := cfg.Global.Zone
if len(zone) <= 1 {
return nil, fmt.Errorf("invalid AWS zone in config file: %s", zone)
}
regionName, err := azToRegion(zone)
if err != nil {
return nil, err
}
valid := isRegionValid(regionName)
if !valid {
return nil, fmt.Errorf("not a valid AWS zone (unknown region): %s", zone)
}
ec2, err := awsServices.Compute(regionName)
if err != nil {
return nil, fmt.Errorf("error creating AWS EC2 client: %v", err)
}
elb, err := awsServices.LoadBalancing(regionName)
if err != nil {
return nil, fmt.Errorf("error creating AWS ELB client: %v", err)
}
asg, err := awsServices.Autoscaling(regionName)
if err != nil {
return nil, fmt.Errorf("error creating AWS autoscaling client: %v", err)
}
awsCloud := &AWSCloud{
ec2: ec2,
elb: elb,
asg: asg,
metadata: metadata,
cfg: cfg,
region: regionName,
}
selfAWSInstance, err := awsCloud.buildSelfAWSInstance()
if err != nil {
return nil, err
}
awsCloud.selfAWSInstance = selfAWSInstance
awsCloud.vpcID = selfAWSInstance.vpcID
filterTags := map[string]string{}
if cfg.Global.KubernetesClusterTag != "" {
filterTags[TagNameKubernetesCluster] = cfg.Global.KubernetesClusterTag
} else {
// TODO: Clean up double-API query
info, err := selfAWSInstance.describeInstance()
if err != nil {
return nil, err
}
for _, tag := range info.Tags {
if orEmpty(tag.Key) == TagNameKubernetesCluster {
filterTags[TagNameKubernetesCluster] = orEmpty(tag.Value)
}
}
}
if filterTags[TagNameKubernetesCluster] == "" {
glog.Errorf("Tag %q not found; Kuberentes may behave unexpectedly.", TagNameKubernetesCluster)
}
awsCloud.filterTags = filterTags
if len(filterTags) > 0 {
glog.Infof("AWS cloud filtering on tags: %v", filterTags)
} else {
glog.Infof("AWS cloud - no tag filtering")
}
// Register handler for ECR credentials
once.Do(func() {
aws_credentials.Init()
})
return awsCloud, nil
}
func (aws *AWSCloud) Clusters() (cloudprovider.Clusters, bool) {
return nil, false
}
// ProviderName returns the cloud provider ID.
func (aws *AWSCloud) ProviderName() string {
return ProviderName
}
// ScrubDNS filters DNS settings for pods.
func (aws *AWSCloud) ScrubDNS(nameservers, searches []string) (nsOut, srchOut []string) {
return nameservers, searches
}
// LoadBalancer returns an implementation of LoadBalancer for Amazon Web Services.
func (s *AWSCloud) LoadBalancer() (cloudprovider.LoadBalancer, bool) {
return s, true
}
// Instances returns an implementation of Instances for Amazon Web Services.
func (aws *AWSCloud) Instances() (cloudprovider.Instances, bool) {
return aws, true
}
// Zones returns an implementation of Zones for Amazon Web Services.
func (aws *AWSCloud) Zones() (cloudprovider.Zones, bool) {
return aws, true
}
// Routes returns an implementation of Routes for Amazon Web Services.
func (aws *AWSCloud) Routes() (cloudprovider.Routes, bool) {
return aws, true
}
// NodeAddresses is an implementation of Instances.NodeAddresses.
func (c *AWSCloud) NodeAddresses(name string) ([]api.NodeAddress, error) {
if c.selfAWSInstance.nodeName == name || len(name) == 0 {
addresses := []api.NodeAddress{}
internalIP, err := c.metadata.GetMetadata("local-ipv4")
if err != nil {
return nil, err
}
addresses = append(addresses, api.NodeAddress{Type: api.NodeInternalIP, Address: internalIP})
// Legacy compatibility: the private ip was the legacy host ip
addresses = append(addresses, api.NodeAddress{Type: api.NodeLegacyHostIP, Address: internalIP})
externalIP, err := c.metadata.GetMetadata("public-ipv4")
if err != nil {
//TODO: It would be nice to be able to determine the reason for the failure,
// but the AWS client masks all failures with the same error description.
glog.V(2).Info("Could not determine public IP from AWS metadata.")
} else {
addresses = append(addresses, api.NodeAddress{Type: api.NodeExternalIP, Address: externalIP})
}
return addresses, nil
}
instance, err := c.getInstanceByNodeName(name)
if err != nil {
return nil, err
}
addresses := []api.NodeAddress{}
if !isNilOrEmpty(instance.PrivateIpAddress) {
ipAddress := *instance.PrivateIpAddress
ip := net.ParseIP(ipAddress)
if ip == nil {
return nil, fmt.Errorf("EC2 instance had invalid private address: %s (%s)", orEmpty(instance.InstanceId), ipAddress)
}
addresses = append(addresses, api.NodeAddress{Type: api.NodeInternalIP, Address: ip.String()})
// Legacy compatibility: the private ip was the legacy host ip
addresses = append(addresses, api.NodeAddress{Type: api.NodeLegacyHostIP, Address: ip.String()})
}
// TODO: Other IP addresses (multiple ips)?
if !isNilOrEmpty(instance.PublicIpAddress) {
ipAddress := *instance.PublicIpAddress
ip := net.ParseIP(ipAddress)
if ip == nil {
return nil, fmt.Errorf("EC2 instance had invalid public address: %s (%s)", orEmpty(instance.InstanceId), ipAddress)
}
addresses = append(addresses, api.NodeAddress{Type: api.NodeExternalIP, Address: ip.String()})
}
return addresses, nil
}
// ExternalID returns the cloud provider ID of the specified instance (deprecated).
func (c *AWSCloud) ExternalID(name string) (string, error) {
if c.selfAWSInstance.nodeName == name {
// We assume that if this is run on the instance itself, the instance exists and is alive
return c.selfAWSInstance.awsID, nil
} else {
// We must verify that the instance still exists
// Note that if the instance does not exist or is no longer running, we must return ("", cloudprovider.InstanceNotFound)
instance, err := c.findInstanceByNodeName(name)
if err != nil {
return "", err
}
if instance == nil {
return "", cloudprovider.InstanceNotFound
}
return orEmpty(instance.InstanceId), nil
}
}
// InstanceID returns the cloud provider ID of the specified instance.
func (c *AWSCloud) InstanceID(name string) (string, error) {
// In the future it is possible to also return an endpoint as:
// <endpoint>/<zone>/<instanceid>
if c.selfAWSInstance.nodeName == name {
return "/" + c.selfAWSInstance.availabilityZone + "/" + c.selfAWSInstance.awsID, nil
} else {
inst, err := c.getInstanceByNodeName(name)
if err != nil {
return "", err
}
return "/" + orEmpty(inst.Placement.AvailabilityZone) + "/" + orEmpty(inst.InstanceId), nil
}
}
// InstanceType returns the type of the specified instance.
func (c *AWSCloud) InstanceType(name string) (string, error) {
if c.selfAWSInstance.nodeName == name {
return c.selfAWSInstance.instanceType, nil
} else {
inst, err := c.getInstanceByNodeName(name)
if err != nil {
return "", err
}
return orEmpty(inst.InstanceType), nil
}
}
// Return a list of instances matching regex string.
func (s *AWSCloud) getInstancesByRegex(regex string) ([]string, error) {
filters := []*ec2.Filter{newEc2Filter("instance-state-name", "running")}
filters = s.addFilters(filters)
request := &ec2.DescribeInstancesInput{
Filters: filters,
}
instances, err := s.ec2.DescribeInstances(request)
if err != nil {
return []string{}, err
}
if len(instances) == 0 {
return []string{}, fmt.Errorf("no instances returned")
}
if strings.HasPrefix(regex, "'") && strings.HasSuffix(regex, "'") {
glog.Infof("Stripping quotes around regex (%s)", regex)
regex = regex[1 : len(regex)-1]
}
re, err := regexp.Compile(regex)
if err != nil {
return []string{}, err
}
matchingInstances := []string{}
for _, instance := range instances {
// Only return fully-ready instances when listing instances
// (vs a query by name, where we will return it if we find it)
if orEmpty(instance.State.Name) == "pending" {
glog.V(2).Infof("Skipping EC2 instance (pending): %s", *instance.InstanceId)
continue
}
privateDNSName := orEmpty(instance.PrivateDnsName)
if privateDNSName == "" {
glog.V(2).Infof("Skipping EC2 instance (no PrivateDNSName): %s",
orEmpty(instance.InstanceId))
continue
}
for _, tag := range instance.Tags {
if orEmpty(tag.Key) == "Name" && re.MatchString(orEmpty(tag.Value)) {
matchingInstances = append(matchingInstances, privateDNSName)
break
}
}
}
glog.V(2).Infof("Matched EC2 instances: %s", matchingInstances)
return matchingInstances, nil
}
// List is an implementation of Instances.List.
func (aws *AWSCloud) List(filter string) ([]string, error) {
// TODO: Should really use tag query. No need to go regexp.
return aws.getInstancesByRegex(filter)
}
// GetZone implements Zones.GetZone
func (c *AWSCloud) GetZone() (cloudprovider.Zone, error) {
return cloudprovider.Zone{
FailureDomain: c.selfAWSInstance.availabilityZone,
Region: c.region,
}, nil
}
// Abstraction around AWS Instance Types
// There isn't an API to get information for a particular instance type (that I know of)
type awsInstanceType struct {
}
// Used to represent a mount device for attaching an EBS volume
// This should be stored as a single letter (i.e. c, not sdc or /dev/sdc)
type mountDevice string
// TODO: Also return number of mounts allowed?
func (self *awsInstanceType) getEBSMountDevices() []mountDevice {
// See: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/block-device-mapping-concepts.html
// We will generate "ba", "bb", "bc"..."bz", "ca", ..., up to DefaultMaxEBSVolumes
devices := []mountDevice{}
count := 0
for first := 'b'; count < DefaultMaxEBSVolumes; first++ {
for second := 'a'; count < DefaultMaxEBSVolumes && second <= 'z'; second++ {
device := mountDevice(fmt.Sprintf("%c%c", first, second))
devices = append(devices, device)
count++
}
}
return devices
}
type awsInstance struct {
ec2 EC2
// id in AWS
awsID string
// node name in k8s
nodeName string
// availability zone the instance resides in
availabilityZone string
// ID of VPC the instance resides in
vpcID string
// ID of subnet the instance resides in
subnetID string
// instance type
instanceType string
mutex sync.Mutex
// We keep an active list of devices we have assigned but not yet
// attached, to avoid a race condition where we assign a device mapping
// and then get a second request before we attach the volume
attaching map[mountDevice]string
}
// newAWSInstance creates a new awsInstance object
func newAWSInstance(ec2Service EC2, instance *ec2.Instance) *awsInstance {
az := ""
if instance.Placement != nil {
az = aws.StringValue(instance.Placement.AvailabilityZone)
}
self := &awsInstance{
ec2: ec2Service,
awsID: aws.StringValue(instance.InstanceId),
nodeName: aws.StringValue(instance.PrivateDnsName),
availabilityZone: az,
instanceType: aws.StringValue(instance.InstanceType),
vpcID: aws.StringValue(instance.VpcId),
subnetID: aws.StringValue(instance.SubnetId),
}
self.attaching = make(map[mountDevice]string)
return self
}
// Gets the awsInstanceType that models the instance type of this instance
func (self *awsInstance) getInstanceType() *awsInstanceType {
// TODO: Make this real
awsInstanceType := &awsInstanceType{}
return awsInstanceType
}
// Gets the full information about this instance from the EC2 API
func (self *awsInstance) describeInstance() (*ec2.Instance, error) {
instanceID := self.awsID
request := &ec2.DescribeInstancesInput{
InstanceIds: []*string{&instanceID},
}
instances, err := self.ec2.DescribeInstances(request)
if err != nil {
return nil, err
}
if len(instances) == 0 {
return nil, fmt.Errorf("no instances found for instance: %s", self.awsID)
}
if len(instances) > 1 {
return nil, fmt.Errorf("multiple instances found for instance: %s", self.awsID)
}
return instances[0], nil
}