ansible: add Nomad systemd service file to install. (#140)

shared/ansible/hashicorp/nomad_bench/roles/nomad/tasks/main.yaml

@@ -1,6 +1,17 @@
 # Copyright (c) HashiCorp, Inc.
 # SPDX-License-Identifier: MPL-2.0
 
+- name: "create_service_file"
+  become: true
+  ansible.builtin.template:
+    src: "nomad.service.j2"
+    dest: "/etc/systemd/system/nomad.service"
+    owner: "root"
+    group: "root"
+    mode: "0755"
+  notify:
+    - "reload_systemd"
+
 - name: "check_nomad_checksum_file"
   ansible.builtin.stat:
     path: "/tmp/nomad_{{ nomad_version }}_SHA256SUMS"

shared/ansible/hashicorp/nomad_bench/roles/nomad/templates/nomad.service.j2

@@ -0,0 +1,24 @@
+[Unit]
+Description=Nomad
+Documentation=https://www.nomadproject.io/docs/
+Wants=network-online.target
+After=network-online.target
+
+[Service]
+User={{ nomad_user }}
+Group={{ nomad_group }}
+
+ExecReload=/bin/kill -HUP $MAINPID
+ExecStart={{ nomad_install_dir }}/nomad agent -config {{ nomad_config_dir }}
+KillMode=process
+KillSignal=SIGINT
+LimitNOFILE=65536
+LimitNPROC=infinity
+Restart=on-failure
+RestartSec=2
+
+TasksMax=infinity
+OOMScoreAdjust=-1000
+
+[Install]
+WantedBy=multi-user.target