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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_cloud
import (
"errors"
"fmt"
"io"
"io/ioutil"
"net"
"net/http"
"net/url"
"os"
"regexp"
"strings"
"sync"
"time"
"code.google.com/p/gcfg"
"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/service/autoscaling"
"github.com/aws/aws-sdk-go/service/ec2"
"github.com/aws/aws-sdk-go/service/elb"
"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
"github.com/GoogleCloudPlatform/kubernetes/pkg/api/resource"
"github.com/GoogleCloudPlatform/kubernetes/pkg/cloudprovider"
"github.com/golang/glog"
)
const ProviderName = "aws"
// The tag name we use to differentiate multiple logically independent clusters running in the same AZ
const TagNameKubernetesCluster = "KubernetesCluster"
// 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() AWSMetadata
}
// 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(volumeID, instanceId, mountDevice string) (resp *ec2.VolumeAttachment, err 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(volumeID string) (resp *ec2.DeleteVolumeOutput, err 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)
DescribeVPCs(*ec2.DescribeVPCsInput) ([]*ec2.VPC, 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)
}
// 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 AWSMetadata interface {
// Query the EC2 metadata service (used to discover instance-id etc)
GetMetaData(key string) ([]byte, error)
}
type VolumeOptions struct {
CapacityMB int
}
// 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(instanceName string, volumeName 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"
DetachDisk(instanceName string, volumeName string) error
// Create a volume with the specified options
CreateVolume(volumeOptions *VolumeOptions) (volumeName string, err error)
DeleteVolume(volumeName 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, TCPLoadBalancer and Instances for Amazon Web Services.
type AWSCloud struct {
awsServices AWSServices
ec2 EC2
asg ASG
cfg *AWSCloudConfig
availabilityZone string
region string
filterTags map[string]string
// The AWS instance that we are running on
selfAWSInstance *awsInstance
mutex sync.Mutex
// Protects elbClients
elbClients map[string]ELB
}
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
}
}
// 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
}
func (p *awsSDKProvider) Compute(regionName string) (EC2, error) {
ec2 := &awsSdkEC2{
ec2: ec2.New(&aws.Config{
Region: regionName,
Credentials: p.creds,
}),
}
return ec2, nil
}
func (p *awsSDKProvider) LoadBalancing(regionName string) (ELB, error) {
elbClient := elb.New(&aws.Config{
Region: regionName,
Credentials: p.creds,
})
return elbClient, nil
}
func (p *awsSDKProvider) Autoscaling(regionName string) (ASG, error) {
client := autoscaling.New(&aws.Config{
Region: regionName,
Credentials: p.creds,
})
return client, nil
}
func (p *awsSDKProvider) Metadata() AWSMetadata {
return &awsSdkMetadata{}
}
// Builds an ELB client for the specified region
func (s *AWSCloud) getELBClient(regionName string) (ELB, error) {
s.mutex.Lock()
defer s.mutex.Unlock()
elbClient, found := s.elbClients[regionName]
if !found {
var err error
elbClient, err = s.awsServices.LoadBalancing(regionName)
if err != nil {
return nil, err
}
s.elbClients[regionName] = elbClient
}
return elbClient, 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 (a *AWSCloud) CurrentNodeName(hostname string) (string, error) {
selfInstance, err := a.getSelfAWSInstance()
if err != nil {
return "", err
}
return selfInstance.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
}
type awsSdkMetadata struct {
}
var metadataClient = http.Client{
Timeout: time.Second * 10,
}
// Implements AWSMetadata.GetMetaData
func (self *awsSdkMetadata) GetMetaData(key string) ([]byte, error) {
// TODO Get an implementation of this merged into aws-sdk-go
url := "http://169.254.169.254/latest/meta-data/" + key
res, err := metadataClient.Get(url)
if err != nil {
return nil, err
}
defer res.Body.Close()
if res.StatusCode != 200 {
err = fmt.Errorf("Code %d returned for url %s", res.StatusCode, url)
return nil, fmt.Errorf("Error querying AWS metadata for key %s: %v", key, err)
}
body, err := ioutil.ReadAll(res.Body)
if err != nil {
return nil, fmt.Errorf("Error querying AWS metadata for key %s: %v", key, err)
}
return []byte(body), 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(volumeID, instanceId, device string) (resp *ec2.VolumeAttachment, err error) {
request := ec2.AttachVolumeInput{
Device: &device,
InstanceID: &instanceId,
VolumeID: &volumeID,
}
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(volumeID string) (resp *ec2.DeleteVolumeOutput, err error) {
request := ec2.DeleteVolumeInput{VolumeID: &volumeID}
return s.ec2.DeleteVolume(&request)
}
func (s *awsSdkEC2) DescribeVPCs(request *ec2.DescribeVPCsInput) ([]*ec2.VPC, error) {
// VPCs are not paged
response, err := s.ec2.DescribeVPCs(request)
if err != nil {
return nil, fmt.Errorf("error listing AWS VPCs: %v", err)
}
return response.VPCs, nil
}
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{},
&credentials.EC2RoleProvider{},
})
aws := &awsSDKProvider{creds: creds}
return newAWSCloud(config, aws)
})
}
// readAWSCloudConfig reads an instance of AWSCloudConfig from config reader.
func readAWSCloudConfig(config io.Reader, metadata AWSMetadata) (*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 getAvailabilityZone(metadata AWSMetadata) (string, error) {
availabilityZoneBytes, err := metadata.GetMetaData("placement/availability-zone")
if err != nil {
return "", err
}
if availabilityZoneBytes == nil || len(availabilityZoneBytes) == 0 {
return "", fmt.Errorf("Unable to determine availability-zone from instance metadata")
}
return string(availabilityZoneBytes), nil
}
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",
"sa-east-1",
}
for _, r := range regions {
if r == region {
return true
}
}
return false
}
// newAWSCloud creates a new instance of AWSCloud.
// AWSProvider and instanceId are primarily for tests
func newAWSCloud(config io.Reader, awsServices AWSServices) (*AWSCloud, error) {
metadata := awsServices.Metadata()
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 := zone[:len(zone)-1]
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)
}
asg, err := awsServices.Autoscaling(regionName)
if err != nil {
return nil, fmt.Errorf("error creating AWS autoscaling client: %v", err)
}
awsCloud := &AWSCloud{
awsServices: awsServices,
ec2: ec2,
asg: asg,
cfg: cfg,
region: regionName,
availabilityZone: zone,
elbClients: map[string]ELB{},
}
filterTags := map[string]string{}
if cfg.Global.KubernetesClusterTag != "" {
filterTags[TagNameKubernetesCluster] = cfg.Global.KubernetesClusterTag
} else {
selfInstance, err := awsCloud.getSelfAWSInstance()
if err != nil {
return nil, err
}
selfInstanceInfo, err := selfInstance.getInfo()
if err != nil {
return nil, err
}
for _, tag := range selfInstanceInfo.Tags {
if orEmpty(tag.Key) == TagNameKubernetesCluster {
filterTags[TagNameKubernetesCluster] = orEmpty(tag.Value)
}
}
}
awsCloud.filterTags = filterTags
if len(filterTags) > 0 {
glog.Infof("AWS cloud filtering on tags: %v", filterTags)
} else {
glog.Infof("AWS cloud - no tag filtering")
}
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
}
// TCPLoadBalancer returns an implementation of TCPLoadBalancer for Amazon Web Services.
func (s *AWSCloud) TCPLoadBalancer() (cloudprovider.TCPLoadBalancer, 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 (aws *AWSCloud) NodeAddresses(name string) ([]api.NodeAddress, error) {
instance, err := aws.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).
// Note that if the instance does not exist or is no longer running, we must return ("", cloudprovider.InstanceNotFound)
func (aws *AWSCloud) ExternalID(name string) (string, error) {
// We must verify that the instance still exists
instance, err := aws.findInstanceByNodeName(name)
if err != nil {
return "", err
}
if instance == nil || !isAlive(instance) {
return "", cloudprovider.InstanceNotFound
}
return orEmpty(instance.InstanceID), nil
}
// InstanceID returns the cloud provider ID of the specified instance.
func (aws *AWSCloud) InstanceID(name string) (string, error) {
// TODO: Do we need to verify it exists, or can we just construct it knowing our AZ (or via caching?)
inst, err := aws.getInstanceByNodeName(name)
if err != nil {
return "", err
}
// In the future it is possible to also return an endpoint as:
// <endpoint>/<zone>/<instanceid>
return "/" + orEmpty(inst.Placement.AvailabilityZone) + "/" + orEmpty(inst.InstanceID), nil
}
// Check if the instance is alive (running or pending)
// We typically ignore instances that are not alive
func isAlive(instance *ec2.Instance) bool {
if instance.State == nil {
glog.Warning("Instance state was unexpectedly nil: ", instance)
return false
}
stateName := orEmpty(instance.State.Name)
switch stateName {
case "shutting-down", "terminated", "stopping", "stopped":
return false
case "pending", "running":
return true
default:
glog.Errorf("unknown EC2 instance state: %s", stateName)
return false
}
}
// Return a list of instances matching regex string.
func (s *AWSCloud) getInstancesByRegex(regex string) ([]string, error) {
filters := []*ec2.Filter{}
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 {
// TODO: Push filtering down into EC2 API filter?
if !isAlive(instance) {
continue
}
// 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)
}
// GetNodeResources implements Instances.GetNodeResources
func (aws *AWSCloud) GetNodeResources(name string) (*api.NodeResources, error) {
instance, err := aws.getInstanceByNodeName(name)
if err != nil {
return nil, err
}
resources, err := getResourcesByInstanceType(orEmpty(instance.InstanceType))
if err != nil {
return nil, err
}
return resources, nil
}
// Builds an api.NodeResources
// cpu is in ecus, memory is in GiB
// We pass the family in so that we could provide more info (e.g. GPU or not)
func makeNodeResources(family string, cpu float64, memory float64) (*api.NodeResources, error) {
return &api.NodeResources{
Capacity: api.ResourceList{
api.ResourceCPU: *resource.NewMilliQuantity(int64(cpu*1000), resource.DecimalSI),
api.ResourceMemory: *resource.NewQuantity(int64(memory*1024*1024*1024), resource.BinarySI),
},
}, nil
}
// Maps an EC2 instance type to k8s resource information
func getResourcesByInstanceType(instanceType string) (*api.NodeResources, error) {
// There is no API for this (that I know of)
switch instanceType {
// t2: Burstable
// TODO: The ECUs are fake values (because they are burstable), so this is just a guess...
case "t1.micro":
return makeNodeResources("t1", 0.125, 0.615)
// t2: Burstable
// TODO: The ECUs are fake values (because they are burstable), so this is just a guess...
case "t2.micro":
return makeNodeResources("t2", 0.25, 1)
case "t2.small":
return makeNodeResources("t2", 0.5, 2)
case "t2.medium":
return makeNodeResources("t2", 1, 4)
// c1: Compute optimized
case "c1.medium":
return makeNodeResources("c1", 5, 1.7)
case "c1.xlarge":
return makeNodeResources("c1", 20, 7)
// cc2: Compute optimized
case "cc2.8xlarge":
return makeNodeResources("cc2", 88, 60.5)
// cg1: GPU instances
case "cg1.4xlarge":
return makeNodeResources("cg1", 33.5, 22.5)
// cr1: Memory optimized
case "cr1.8xlarge":
return makeNodeResources("cr1", 88, 244)
// c3: Compute optimized
case "c3.large":
return makeNodeResources("c3", 7, 3.75)
case "c3.xlarge":
return makeNodeResources("c3", 14, 7.5)
case "c3.2xlarge":
return makeNodeResources("c3", 28, 15)
case "c3.4xlarge":
return makeNodeResources("c3", 55, 30)
case "c3.8xlarge":
return makeNodeResources("c3", 108, 60)
// c4: Compute optimized
case "c4.large":
return makeNodeResources("c4", 8, 3.75)
case "c4.xlarge":
return makeNodeResources("c4", 16, 7.5)
case "c4.2xlarge":
return makeNodeResources("c4", 31, 15)
case "c4.4xlarge":
return makeNodeResources("c4", 62, 30)
case "c4.8xlarge":
return makeNodeResources("c4", 132, 60)
// g2: GPU instances
case "g2.2xlarge":
return makeNodeResources("g2", 26, 15)
// hi1: Storage optimized (SSD)
case "hi1.4xlarge":
return makeNodeResources("hs1", 35, 60.5)
// hs1: Storage optimized (HDD)
case "hs1.8xlarge":
return makeNodeResources("hs1", 35, 117)
// d2: Dense instances (next-gen of hs1)
case "d2.xlarge":
return makeNodeResources("d2", 14, 30.5)
case "d2.2xlarge":
return makeNodeResources("d2", 28, 61)
case "d2.4xlarge":
return makeNodeResources("d2", 56, 122)
case "d2.8xlarge":
return makeNodeResources("d2", 116, 244)
// m1: General purpose
case "m1.small":
return makeNodeResources("m1", 1, 1.7)
case "m1.medium":
return makeNodeResources("m1", 2, 3.75)
case "m1.large":
return makeNodeResources("m1", 4, 7.5)
case "m1.xlarge":
return makeNodeResources("m1", 8, 15)
// m2: Memory optimized
case "m2.xlarge":
return makeNodeResources("m2", 6.5, 17.1)
case "m2.2xlarge":
return makeNodeResources("m2", 13, 34.2)
case "m2.4xlarge":
return makeNodeResources("m2", 26, 68.4)
// m3: General purpose
case "m3.medium":
return makeNodeResources("m3", 3, 3.75)
case "m3.large":
return makeNodeResources("m3", 6.5, 7.5)
case "m3.xlarge":
return makeNodeResources("m3", 13, 15)
case "m3.2xlarge":
return makeNodeResources("m3", 26, 30)
// m4: General purpose
case "m4.large":
return makeNodeResources("m4", 6.5, 8)
case "m4.xlarge":
return makeNodeResources("m4", 13, 16)
case "m4.2xlarge":
return makeNodeResources("m4", 26, 32)
case "m4.4xlarge":
return makeNodeResources("m4", 53.5, 64)
case "m4.10xlarge":
return makeNodeResources("m4", 124.5, 160)
// i2: Storage optimized (SSD)
case "i2.xlarge":
return makeNodeResources("i2", 14, 30.5)
case "i2.2xlarge":
return makeNodeResources("i2", 27, 61)
case "i2.4xlarge":
return makeNodeResources("i2", 53, 122)
case "i2.8xlarge":
return makeNodeResources("i2", 104, 244)
// r3: Memory optimized
case "r3.large":
return makeNodeResources("r3", 6.5, 15)
case "r3.xlarge":
return makeNodeResources("r3", 13, 30.5)
case "r3.2xlarge":
return makeNodeResources("r3", 26, 61)
case "r3.4xlarge":
return makeNodeResources("r3", 52, 122)
case "r3.8xlarge":
return makeNodeResources("r3", 104, 244)
default:
glog.Errorf("unknown instanceType: %s", instanceType)
return nil, nil
}
}
// GetZone implements Zones.GetZone
func (self *AWSCloud) GetZone() (cloudprovider.Zone, error) {
if self.availabilityZone == "" {
// Should be unreachable
panic("availabilityZone not set")
}
return cloudprovider.Zone{
FailureDomain: self.availabilityZone,
Region: self.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 {
}
// TODO: Also return number of mounts allowed?
func (self *awsInstanceType) getEBSMountDevices() []string {
// See: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/block-device-mapping-concepts.html
devices := []string{}
for c := 'f'; c <= 'p'; c++ {
devices = append(devices, fmt.Sprintf("%c", c))
}
return devices
}
type awsInstance struct {
ec2 EC2
// id in AWS
awsID string
// node name in k8s
nodeName string
mutex sync.Mutex
// We must cache because otherwise there is a race condition,
// where we assign a device mapping and then get a second request before we attach the volume
deviceMappings map[string]string
}
func newAWSInstance(ec2 EC2, awsID, nodeName string) *awsInstance {
self := &awsInstance{ec2: ec2, awsID: awsID, nodeName: nodeName}
// We lazy-init deviceMappings
self.deviceMappings = nil
return self
}
// Gets the awsInstanceType that models the instance type of this instance
func (self *awsInstance) getInstanceType() *awsInstanceType {
// TODO: Make this real