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check-ecs-agent.go
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check-ecs-agent.go
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package main
import (
"flag"
"fmt"
"os"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/ec2metadata"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/ecs"
)
func main() {
cluster := flag.String("cluster", "", "The name of the ECS cluster this instance belongs to.")
flag.Parse()
metadataClient := ec2metadata.New(session.New())
region, err := metadataClient.Region()
if err != nil {
fmt.Println(err.Error())
return
}
instanceId, err := metadataClient.GetMetadata("instance-id")
if err != nil {
fmt.Println(err.Error())
return
}
ecsClient := ecs.New(session.New(), &aws.Config{Region: aws.String(region)})
listParams := &ecs.ListContainerInstancesInput{
Cluster: aws.String(*cluster),
}
listResp, err := ecsClient.ListContainerInstances(listParams)
if err != nil {
fmt.Println(err.Error())
return
}
describeParams := &ecs.DescribeContainerInstancesInput{
Cluster: aws.String(*cluster),
ContainerInstances: listResp.ContainerInstanceArns,
}
describeResp, err := ecsClient.DescribeContainerInstances(describeParams)
if err != nil {
fmt.Println(err.Error())
return
}
for _, containerInstance := range describeResp.ContainerInstances {
if *containerInstance.Ec2InstanceId == instanceId {
if *containerInstance.AgentConnected == false {
fmt.Printf("Amazon ECS Agent on %v is not connected.\n", *containerInstance.Ec2InstanceId)
os.Exit(2)
} else {
fmt.Printf("Amazon ECS Agent on %v is connected.\n", *containerInstance.Ec2InstanceId)
os.Exit(0)
}
}
}
}