HyperPod SSM Access

Prerequisites

aws CLI v2, authenticated for the target account/Region.
session-manager-plugin — installed alongside the AWS CLI.
jq — the scripts build JSON payloads with it.
unbuffer (from the expect package) — wraps aws ssm start-session with a PTY so the session-manager-plugin flushes stdout instead of racing to close. Without it, calls intermittently return empty output with Cannot perform start session: EOF even when the command ran. Install with sudo yum install expect, sudo apt install expect, or brew install expect. ssm-exec.sh detects and uses it automatically; falls back with a warning if missing.

Target: sagemaker-cluster:<CLUSTER_ID>_<GROUP_NAME>-<INSTANCE_ID>

CLUSTER_ID: Last segment of cluster ARN (NOT the cluster name). Extract via get-cluster-info.sh.
GROUP_NAME: Instance group name — retrieve via list-nodes.sh.
INSTANCE_ID: EC2 instance ID (e.g., i-0123456789abcdef0)