AWS CLI EMR get Master node Instance ID and tag it

Question

I want to automate the running of a cluster and can use tags to get attributes of an EC2 instance like its instance-id.

The documentation on https://docs.aws.amazon.

Answer 1

In an enviroinment where you does not have the aws cli, you can cat the following file:

cat /mnt/var/lib/info/job-flow.json

An example of the content is the following one:

{
  "jobFlowId": "j-0000X0X0X00XX",
  "jobFlowCreationInstant": 1579512208006,
  "instanceCount": 2,
  "masterInstanceId": "i-00x0xx0000xxx0x00",
  "masterPrivateDnsName": "localhost",
  "masterInstanceType": "m5.xlarge",
  "slaveInstanceType": "m5.xlarge",
  "hadoopVersion": "2.8.5",
  "instanceGroups": [
    {
      "instanceGroupId": "ig-0XX00XX0X0XXX",
      "instanceGroupName": "Master - 1",
      "instanceRole": "Master",
      "marketType": "OnDemand",
      "instanceType": "m5.xlarge",
      "requestedInstanceCount": 1
    },
    {
      "instanceGroupId": "ig-000X0XXXXXXX",
      "instanceGroupName": "Core - 2",
      "instanceRole": "Core",
      "marketType": "OnDemand",
      "instanceType": "m5.xlarge",
      "requestedInstanceCount": 1
    }
  ]

NOTE: i've omitted the ID of the jobs using 0 where a number is expected and X where a ltter is expected.