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// Package aws provides node discovery for Amazon AWS.
package aws
import (
"fmt"
"io/ioutil"
"log"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/credentials"
"github.com/aws/aws-sdk-go/aws/defaults"
"github.com/aws/aws-sdk-go/aws/ec2metadata"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/ec2"
)
type Provider struct{}
func (p *Provider) Help() string {
return `Amazon AWS:
provider: "aws"
region: The AWS region. Default to region of instance.
tag_key: The tag key to filter on
tag_value: The tag value to filter on
addr_type: "private_v4", "public_v4" or "public_v6". Defaults to "private_v4".
access_key_id: The AWS access key to use
secret_access_key: The AWS secret access key to use
The only required IAM permission is 'ec2:DescribeInstances'. If the Consul agent is
running on AWS instance it is recommended you use an IAM role, otherwise it is
recommended you make a dedicated IAM user and access key used only for auto-joining.
`
}
func (p *Provider) Addrs(args map[string]string, l *log.Logger) ([]string, error) {
if args["provider"] != "aws" {
return nil, fmt.Errorf("discover-aws: invalid provider " + args["provider"])
}
if l == nil {
l = log.New(ioutil.Discard, "", 0)
}
region := args["region"]
tagKey := args["tag_key"]
tagValue := args["tag_value"]
addrType := args["addr_type"]
accessKey := args["access_key_id"]
secretKey := args["secret_access_key"]
if addrType != "private_v4" && addrType != "public_v4" && addrType != "public_v6" {
l.Printf("[INFO] discover-aws: Address type %s is not supported. Valid values are {private_v4,public_v4,public_v6}. Falling back to 'private_v4'", addrType)
addrType = "private_v4"
}
if addrType == "" {
l.Printf("[DEBUG] discover-aws: Address type not provided. Using 'private_v4'")
addrType = "private_v4"
}
log.Printf("[DEBUG] discover-aws: Using region=%s tag_key=%s tag_value=%s addr_type=%s", region, tagKey, tagValue, addrType)
if accessKey == "" && secretKey == "" {
log.Printf("[DEBUG] discover-aws: No static credentials")
log.Printf("[DEBUG] discover-aws: Using environment variables, shared credentials or instance role")
} else {
log.Printf("[DEBUG] discover-aws: Static credentials provided")
}
if region == "" {
l.Printf("[INFO] discover-aws: Region not provided. Looking up region in metadata...")
ec2meta := ec2metadata.New(session.New())
identity, err := ec2meta.GetInstanceIdentityDocument()
if err != nil {
return nil, fmt.Errorf("discover-aws: GetInstanceIdentityDocument failed: %s", err)
}
region = identity.Region
}
l.Printf("[INFO] discover-aws: Region is %s", region)
l.Printf("[DEBUG] discover-aws: Creating session...")
svc := ec2.New(session.New(), &aws.Config{
Region: ®ion,
Credentials: credentials.NewChainCredentials(
[]credentials.Provider{
&credentials.StaticProvider{
Value: credentials.Value{
AccessKeyID: accessKey,
SecretAccessKey: secretKey,
},
},
&credentials.EnvProvider{},
&credentials.SharedCredentialsProvider{},
defaults.RemoteCredProvider(*(defaults.Config()), defaults.Handlers()),
}),
})
l.Printf("[INFO] discover-aws: Filter instances with %s=%s", tagKey, tagValue)
resp, err := svc.DescribeInstances(&ec2.DescribeInstancesInput{
Filters: []*ec2.Filter{
&ec2.Filter{
Name: aws.String("tag:" + tagKey),
Values: []*string{aws.String(tagValue)},
},
&ec2.Filter{
Name: aws.String("instance-state-name"),
Values: []*string{aws.String("running")},
},
},
})
if err != nil {
return nil, fmt.Errorf("discover-aws: DescribeInstancesInput failed: %s", err)
}
l.Printf("[DEBUG] discover-aws: Found %d reservations", len(resp.Reservations))
var addrs []string
for _, r := range resp.Reservations {
l.Printf("[DEBUG] discover-aws: Reservation %s has %d instances", *r.ReservationId, len(r.Instances))
for _, inst := range r.Instances {
id := *inst.InstanceId
l.Printf("[DEBUG] discover-aws: Found instance %s", id)
switch addrType {
case "public_v6":
l.Printf("[DEBUG] discover-aws: Instance %s has %d network interfaces", id, len(inst.NetworkInterfaces))
for _, networkinterface := range inst.NetworkInterfaces {
l.Printf("[DEBUG] discover-aws: Checking NetworInterfaceId %s on Instance %s", *networkinterface.NetworkInterfaceId, id)
// Check if instance got any ipv6
if networkinterface.Ipv6Addresses == nil {
l.Printf("[DEBUG] discover-aws: Instance %s has no IPv6 on NetworkInterfaceId %s", id, *networkinterface.NetworkInterfaceId)
continue
}
for _, ipv6address := range networkinterface.Ipv6Addresses {
l.Printf("[INFO] discover-aws: Instance %s has IPv6 %s on NetworkInterfaceId %s", id, *ipv6address.Ipv6Address, *networkinterface.NetworkInterfaceId)
addrs = append(addrs, *ipv6address.Ipv6Address)
}
}
case "public_v4":
if inst.PublicIpAddress == nil {
l.Printf("[DEBUG] discover-aws: Instance %s has no public IPv4", id)
continue
}
l.Printf("[INFO] discover-aws: Instance %s has public ip %s", id, *inst.PublicIpAddress)
addrs = append(addrs, *inst.PublicIpAddress)
default:
// EC2-Classic don't have the PrivateIpAddress field
if inst.PrivateIpAddress == nil {
l.Printf("[DEBUG] discover-aws: Instance %s has no private ip", id)
continue
}
l.Printf("[INFO] discover-aws: Instance %s has private ip %s", id, *inst.PrivateIpAddress)
addrs = append(addrs, *inst.PrivateIpAddress)
}
}
}
l.Printf("[DEBUG] discover-aws: Found ip addresses: %v", addrs)
return addrs, nil
}
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