Manage Minecraft servers with systemd

roles/minecraft/defaults/main.yml

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+minecraft_eula: false
+minecraft_home: "/opt/minecraft"
+minecraft_url: "https://launcher.mojang.com/v1/objects/{{ minecraft_sha1 }}/server.jar"
+minecraft_user: minecraft
+minecraft_xms: 1G
+minecraft_xmx: "{{ minecraft_xms }}"

roles/minecraft/tasks/main.yml

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+- name: Install Screen
+  apt:
+    name: screen
+    state: present
+
+- name: Install Java
+  apt:
+    name: default-jre
+    state: present
+
+- name: Create Minecraft user
+  user:
+    name: "{{ minecraft_user }}"
+    state: present
+    shell: /bin/bash
+
+- name: Create Minecraft directory
+  file:
+    path: "{{ minecraft_home }}"
+    state: directory
+    owner: "{{ minecraft_user }}"
+    group: "{{ minecraft_user }}"
+
+- name: Download Minecraft
+  get_url:
+    url: "{{ minecraft_url }}"
+    dest: "{{ minecraft_home }}/minecraft_server.jar"
+    checksum: "sha1:{{ minecraft_sha1 }}"
+    owner: "{{ minecraft_user }}"
+    group: "{{ minecraft_user }}"
+    mode: 0700
+
+- name: Deploy Minecraft systemd service
+  template:
+    src: minecraft.service.j2
+    dest: "/etc/systemd/system/minecraft.service"
+  register: minecraft_systemd
+
+- name: Answer to Mojang's EULA
+  template:
+    src: eula.txt.j2
+    dest: "{{ minecraft_home }}/eula.txt"
+    owner: "{{ minecraft_user }}"
+    group: "{{ minecraft_user }}"
+
+- name: Reload systemd manager configuration
+  systemd:
+    daemon_reload: true
+  when: minecraft_systemd.changed
+
+- name: Start Service
+  service:
+    name: minecraft
+    state: started
+  when: minecraft_eula

roles/minecraft/templates/eula.txt.j2

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+eula={{ minecraft_eula | lower }}

roles/minecraft/templates/minecraft.service.j2

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+[Unit]
+Description=Minecraft Server
+After=network.target
+
+[Service]
+Type=simple
+WorkingDirectory={{ minecraft_home }}
+User={{ minecraft_user }}
+Group={{ minecraft_user }}
+Restart=always
+
+ExecStart=/usr/bin/screen -DmS minecraft \
+  /usr/bin/java -Xms{{ minecraft_xms }} -Xmx{{ minecraft_xmx }} -jar minecraft_server.jar nogui
+ExecReload=/usr/bin/screen -p 0 -S minecraft -X eval 'stuff "reload"\\015'
+ExecStop=/usr/bin/screen -p 0 -S minecraft -X eval 'stuff "say SERVER SHUTDOWN IN 30 SECONDS"\015'
+ExecStop=/bin/sleep 15
+ExecStop=/usr/bin/screen -p 0 -S minecraft -X eval 'stuff "say SERVER SHUTDOWN IN 15 SECONDS"\015'
+ExecStop=/bin/sleep 10
+ExecStop=/usr/bin/screen -p 0 -S minecraft -X eval 'stuff "say SERVER SHUTDOWN IN 5 SECONDS"\015'
+ExecStop=/bin/sleep 5
+ExecStop=/usr/bin/screen -p 0 -S minecraft -X eval 'stuff "save-all"\015'
+ExecStop=/bin/sleep 1
+ExecStop=/usr/bin/screen -p 0 -S minecraft -X eval 'stuff "stop"\015'
+ExecStop=/bin/sleep 3
+
+[Install]
+WantedBy=multi-user.target