The apt-get install cuda-drivers exit status is masked by piping to grep and then || true (and there’s no set -o pipefail). If apt-get fails, the script will still continue as if the driver installed. Don’t swallow the exit code; keep filtered output but check PIPESTATUS[0] / enable pipefail.

This section relies on lsb_release to detect Ubuntu version; on minimal images lsb-release may be missing, causing repo selection to fail. Consider installing/checking required tooling (lsb-release, wget, curl, gnupg, ca-certificates) before repo setup so the script fails fast with a clear message.

--version / LLM_D_VERSION is accepted and stored but never used to select a chart/app version during installation. Either wire this into the helm upgrade --install call (e.g., chart --version and/or image tag values) or remove the flag to avoid implying version pinning works when it doesn’t.

--with-gateway sets INSTALL_GATEWAY=true, but the flag is never used later (no Gateway/Istio installation or configuration occurs). Either implement the gateway install path or remove the option/help text to avoid implying external access is configured.

lspci is required for GPU detection, but it may not be present on minimal Ubuntu images (pciutils). If it’s missing, this check will fail (or false-negative) and the script exits early. Install/check pciutils (and any other required tools) before running the pre-flight GPU check, and surface a clear error if installation fails.

Force-killing apt-get/dpkg with pkill -9 can interrupt legitimate package operations (e.g., unattended-upgrades) and leave the node in a broken dpkg state. Prefer waiting for locks and failing clearly, or only terminating the specific PID(s) holding the locks after a timeout.

Manually deleting dpkg/apt lock files is risky if a package operation is still running or if lock semantics differ. Consider avoiding lock-file deletion, or only removing after verifying no process holds the locks, and exit with a clear error when locks persist.

The Helm values aggregation logic builds HELM_VALUES by concatenating untrusted CLI parameters like MODEL_NAME and REPLICAS and later injects this string unquoted into the helm upgrade command, which allows shell metacharacters (e.g., ;, &&) in those parameters to break out of the intended argument and execute arbitrary commands. Because this script is designed for unattended remote execution, an attacker who can influence --model or --replicas can achieve command execution on the host under the script’s privileges. To fix this, avoid concatenating untrusted data into a single shell string and instead pass --set values as separately quoted arguments or via a Helm values file.

This script automatically adds the external Helm repo https://llm-d.github.io/llm-d/ and installs/upgrades the llm-d/llm-d chart without pinning to a specific immutable version or verifying chart signatures, effectively granting third-party code cluster-admin level execution each time it runs. If the llm-d Helm repository or its distribution channel is compromised, an attacker could ship a malicious chart that gains access to cluster secrets or escalates privileges. To mitigate this supply chain risk, pin the chart to a specific immutable version/digest (or vendor it internally) and enable integrity verification where supported.

The kubeadm init invocation interpolates NODE_IP, POD_NETWORK_CIDR, and CERT_SANS directly into the command without quoting or validation, allowing shell metacharacters in these CLI-controlled values to terminate the kubeadm command and execute arbitrary commands (e.g., by passing --ip '1.2.3.4; evil_cmd #'). Since this script is intended for unattended remote execution, a user who can influence these parameters can gain code execution on the control-plane node with root privileges. To prevent this, strictly validate these options as IP/CIDR/SAN strings and pass them to kubeadm as separately quoted arguments or via a configuration file instead of embedding them unquoted in the shell command.