Initial Cezen AI Suite installer — Entry tier

ansible/roles/vllm/tasks/main.yml

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+---
+# vLLM — high-performance LLM inference with OpenAI-compatible API
+# Entry tier: runs as a Docker container (easier to manage than pip install)
+- name: Pull vLLM Docker image
+  shell: docker pull vllm/vllm-openai:latest
+  retries: 3
+  delay: 15
+
+- name: Create vLLM systemd service
+  copy:
+    dest: /etc/systemd/system/vllm.service
+    content: |
+      [Unit]
+      Description=vLLM OpenAI-Compatible Inference Server
+      After=docker.service ollama.service
+      Requires=docker.service
+
+      [Service]
+      Restart=always
+      RestartSec=5
+      ExecStartPre=-/usr/bin/docker stop vllm
+      ExecStartPre=-/usr/bin/docker rm vllm
+      ExecStart=/usr/bin/docker run \
+        --name vllm \
+        --gpus all \
+        --ipc=host \
+        -p 8000:8000 \
+        -v /opt/cezen/models:/root/.cache/huggingface \
+        -e HF_HOME=/root/.cache/huggingface \
+        vllm/vllm-openai:latest \
+        --model meta-llama/Meta-Llama-3.1-8B-Instruct \
+        --gpu-memory-utilization 0.7 \
+        --max-model-len 8192 \
+        --tensor-parallel-size 1
+      ExecStop=/usr/bin/docker stop vllm
+
+      [Install]
+      WantedBy=multi-user.target
+    mode: "0644"
+
+- name: Enable vLLM (but don't start yet — model selection needed first)
+  systemd:
+    name: vllm
+    enabled: yes
+    daemon_reload: yes
+  # Note: vLLM service is enabled but not started by default.
+  # Start manually after choosing a model:
+  #   sudo systemctl start vllm
+  # Or change the --model flag in /etc/systemd/system/vllm.service first.
+
+- name: Create vLLM model directory
+  file:
+    path: /opt/cezen/models/hf_cache
+    state: directory
+    owner: cezen
+    group: cezen