README.md

@@ -2,9 +2,20 @@
 
 ## Usage
 
+0. Install Arch Linux for domserver and **Debian 11** for judgehost.
 1. Fill in the vars in `group_vars`.
-2. Fill in `domserver` and `judgehost` machine ips in `hosts` file.
+2. Fill in `domserver` and `judgehost` groups in `hosts` file.
 3. Run `ansible-playbook playbooks/domserver`.
 4. Run `ansible-playbook playbooks/judgehost`.
 5. Put web cert and key to `/etc/haproxy/cert.pem` on domserver.
 6. Check if judgehost been registered.
+
+## Trouble shooting
+
+### Judgehost cannot startup
+
+The cgroups v2 support had been patched since October, 2024. However the latest
+release of domjudge is 8.3.1, which was published on September, 2024.
+
+Therefore, before cgroups v2 patch came out as a stable release, we still have
+to use a older release, like Debian 11, to make things work.

group_vars/judgehost/main.yml

@@ -1,2 +1,5 @@
 ---
 judgehost_version: 8.3.1
+
+# For legacy support
+domjudge_tarball_url: https://www.domjudge.org/releases/domjudge-8.3.1.tar.gz

hosts

@@ -10,4 +10,4 @@ localhost ansible_connection=local
 10.4.2.228
 
 [all:vars]
-ansible_python_interpreter=/usr/bin/python
+ansible_python_interpreter=/usr/bin/python3

playbooks/judgehost.yml

@@ -2,5 +2,5 @@
 - name: Install judgehost
   hosts: judgehost
   roles:
-    - role: install_packages
-    - role: configure_judgehost
+    - role: install_packages_debian11
+    - role: configure_judgehost_legacy

roles/configure_judgehost/tasks/main.yml

@@ -3,11 +3,7 @@
   ansible.builtin.lineinfile:
     path: /boot/loader/entries/arch.conf
     line: >-
-      options
-      cgroup_enable=memory
-      swapaccount=1
-      SYSTEMD_CGROUP_ENABLE_LEGACY_FORCE=1
-      systemd.unified_cgroup_hierarchy=0
+      options cgroup_enable=memory
   notify: Reboot
 - name: Flush handlers
   ansible.builtin.meta: flush_handlers

roles/configure_judgehost_legacy/tasks/domjudge.yml

@@ -0,0 +1,13 @@
+- name: Download domjudge tarball
+  ansible.builtin.get_url:
+    url: "{{ domjudge_tarball_url }}"
+    dest: /opt/
+    mode: '0644'
+    owner: root
+    group: root
+  register: downloaded_tarball
+- name: Extract domjudge tarball
+  ansible.builtin.unarchive:
+    src: "{{ downloaded_tarball.dest }}"
+    dest: "{{ (downloaded_tarball.dest | basename).split('.') | first }}"
+    remote_src: true

roles/install_packages_debian11/tasks/main.yml

@@ -0,0 +1,18 @@
+---
+- name: Install packages
+  ansible.builtin.apt:
+    pkg:
+      - make
+      - pkg-config
+      - sudo
+      - debootstrap
+      - libcgroup-dev
+      - php-cli
+      - php-curl
+      - php-json
+      - php-xml
+      - php-zip
+      - lsof
+      - procps
+      - gcc
+      - g++