aws-auth
Makes the management of the aws-auth config map for EKS Kubernetes clusters easier
Use cases
-
make bootstrapping a node group or removing/adding user access on EKS fast and easy
-
useful for automation purposes, any workflow that needs to grant IAM access to an EKS cluster can use this library to modify the config map.
-
run as part of a workflow on kubernetes using a docker image
Install
$ go get github.com/keikoproj/aws-auth
Usage from command line or Krew
Either download/install a released binary or add as a plugin to kubectl via Krew
$ kubectl krew update
$ kubectl krew install aws-auth
Installing plugin: aws-auth
Installed plugin: aws-auth
$ kubectl krew aws-auth
aws-auth modifies the aws-auth configmap on eks clusters
Usage:
aws-auth [command]
Available Commands:
help Help about any command
remove remove removes a user or role from the aws-auth configmap
remove-by-username remove-by-username removes all map roles and map users from the aws-auth configmap
upsert upsert updates or inserts a user or role to the aws-auth configmap
version Version of aws-auth
Flags:
-h, --help help for aws-auth
Use "aws-auth [command] --help" for more information about a command.
Given a config map with the following data:
$ kubectl get configmap aws-auth -n kube-system -o yaml
apiVersion: v1
kind: ConfigMap
metadata:
name: aws-auth
namespace: kube-system
data:
mapRoles: |
- rolearn: arn:aws:iam::555555555555:role/devel-worker-nodes-NodeInstanceRole-74RF4UBDUKL6
username: system:node:{{EC2PrivateDNSName}}
groups:
- system:bootstrappers
- system:nodes
- rolearn: arn:aws:iam::555555555555:role/abc
username: ops-user
groups:
- system:masters
mapUsers: |
- userarn: arn:aws:iam::555555555555:user/a-user
username: admin
groups:
- system:masters
- userarn: arn:aws:iam::555555555555:user/a-user
username: ops-user
groups:
- system:masters
Remove all access belonging to an ARN (both mapUser roles will be removed)
$ aws-auth remove --mapusers --userarn arn:aws:iam::555555555555:user/a-user
removed arn:aws:iam::555555555555:user/a-user from aws-auth
Remove by full match (only mapUsers[0] will be removed)
$ aws-auth remove --mapusers --userarn arn:aws:iam::555555555555:user/a-user --username admin --groups system:masters
removed arn:aws:iam::555555555555:user/a-user from aws-auth
Remove based on a username
This command removes all map roles and map users that have matching input username. In the above configmap, map role for roleARN arn:aws:iam::555555555555:role/abc and mapUser for userARN arn:aws:iam::555555555555:user/a-user will be removed.
$ aws-auth remove-by-username --username ops-user
Bootstrap a new node group role
$ aws-auth upsert --maproles --rolearn arn:aws:iam::555555555555:role/my-new-node-group-NodeInstanceRole-74RF4UBDUKL6 --username system:node:{{EC2PrivateDNSName}} --groups system:bootstrappers system:nodes
added arn:aws:iam::555555555555:role/my-new-node-group-NodeInstanceRole-74RF4UBDUKL6 to aws-auth
You can also add retries with exponential backoff
$ aws-auth upsert --maproles --rolearn arn:aws:iam::555555555555:role/my-new-node-group-NodeInstanceRole-74RF4UBDUKL6 --username system:node:{{EC2PrivateDNSName}} --groups system:bootstrappers system:nodes --retry
Retries are configurable using the following flags
--retry Retry on failure with exponential backoff
--retry-max-count int Maximum number of retries before giving up (default 12)
--retry-max-time duration Maximum wait interval (default 30s)
--retry-min-time duration Minimum wait interval (default 200ms)
Append groups to mapping instead of overwriting by using --append
$ aws-auth upsert --maproles --rolearn arn:aws:iam::00000000000:role/test --username test --groups test --append
Avoid overwriting username by using --update-username=false
$ aws-auth upsert --maproles --rolearn arn:aws:iam::00000000000:role/test --username test2 --groups test --update-username=false
Use the get command to get a detailed view of mappings
$ aws-auth get
TYPE ARN USERNAME GROUPS
Role Mapping arn:aws:iam::555555555555:role/my-new-node-group system:node:{{EC2PrivateDNSName}} system:bootstrappers, system:nodes
use impersonate
aws-auth get|update|remove --as <username> --as-group <groupname>
Usage as a library
package main
import (
awsauth "github.com/keikoproj/aws-auth/pkg/mapper"
)
func someFunc(client kubernetes.Interface) error {
awsAuth := awsauth.New(client, false)
myUpsertRole := &awsauth.MapperArguments{
MapRoles: true,
RoleARN: "arn:aws:iam::555555555555:role/my-new-node-group-NodeInstanceRole-74RF4UBDUKL6",
Username: "system:node:{{EC2PrivateDNSName}}",
Groups: []string{
"system:bootstrappers",
"system:nodes",
},
WithRetries: true,
MinRetryTime: time.Millisecond * 100,
MaxRetryTime: time.Second * 30,
MaxRetryCount: 12,
}
err = awsAuth.Upsert(myUpsertRole)
if err != nil {
return err
}
}Run in a container
$ docker run \
-v ~/.kube/:/root/.kube/ \
-v ~/.aws/:/root/.aws/ \
keikoproj/aws-auth:latest \
aws-auth upsert --mapusers \
--userarn arn:aws:iam::555555555555:user/a-user \
--username admin \
--groups system:masters