feat: restore check and fix but disabled

Author: samrose

ansible/files/systemd-networkd/systemd-networkd-check-and-fix.service

@@ -0,0 +1,12 @@
+[Unit]
+Description=Check if systemd-networkd has broken NDisc routes and fix
+# Remove Requisite to prevent being killed when restarting networkd
+Requisite=systemd-networkd.service
+After=systemd-networkd.service
+
+[Service]
+Type=oneshot
+# This needs to be root for the service restart to work
+User=root
+Group=root
+ExecStart=/usr/local/bin/systemd-networkd-check-and-fix.sh

ansible/files/systemd-networkd/systemd-networkd-check-and-fix.sh

@@ -0,0 +1,20 @@
+#!/bin/bash
+
+# Check for occurrences of an NDisc log error
+# NOTE: --since timer flag must match the cadence of systemd timer unit. Risk of repeat matches and restart loop
+journalctl --no-pager --unit systemd-networkd --since "1 minutes ago" --grep "Could not set NDisc route" >/dev/null
+NDISC_ERROR=$?
+
+if systemctl is-active --quiet systemd-networkd.service && [ "${NDISC_ERROR}" == 0 ]; then
+  echo "$(date) systemd-network running but NDisc routes are broken. Restarting systemd.networkd.service"
+  /usr/bin/systemctl restart systemd-networkd.service
+  exit  # no need to check further
+fi
+
+# check for routes
+ROUTES=$(ip -6 route list)
+
+if ! echo "${ROUTES}" | grep default >/dev/null || ! echo "${ROUTES}" | grep "::1 dev lo">/dev/null; then
+  echo "IPv6 routing table messed up. Restarting systemd.networkd.service"
+  /usr/bin/systemctl restart systemd-networkd.service
+fi

ansible/files/systemd-networkd/systemd-networkd-check-and-fix.timer

@@ -0,0 +1,9 @@
+[Unit]
+Description=Check if systemd-networkd has broken NDisc routes and fix
+
+[Timer]
+# NOTE: cadence must match that of the journalctl search (--since). Risk of repeat matches and restart loop
+OnCalendar=minutely
+
+[Install]
+WantedBy=timers.target

ansible/playbook.yml

@@ -78,6 +78,12 @@
         - install-supabase-internal
       when: debpkg_mode or nixpkg_mode
 
+    - name: Fix IPv6 NDisc issues (disabled)
+      import_tasks: tasks/fix_ipv6_ndisc.yml
+      tags:
+        - install-supabase-internal
+      when: (debpkg_mode or nixpkg_mode) and (qemu_mode is undefined)
+
     - name: Start Postgres Database without Systemd
       become: yes
       become_user: postgres

ansible/tasks/fix-ipv6-ndisc.yml

@@ -0,0 +1,33 @@
+---
+- name: fix Network - systemd timer file
+  copy:
+    dest: /etc/systemd/system/systemd-networkd-check-and-fix.timer
+    src: "files/systemd-networkd/systemd-networkd-check-and-fix.timer"
+    owner: root
+    group: root
+    mode: 0644
+
+- name: fix Network - systemd service file
+  copy:
+    dest: /etc/systemd/system/systemd-networkd-check-and-fix.service
+    src: "files/systemd-networkd/systemd-networkd-check-and-fix.service"
+    owner: root
+    group: root
+    mode: 0644
+
+- name: fix Network - detect script
+  copy:
+    dest: /usr/local/bin/systemd-networkd-check-and-fix.sh
+    src: "files/systemd-networkd/systemd-networkd-check-and-fix.sh"
+    owner: root
+    group: root
+    mode: 0700
+
+- name: fix Network - reload systemd
+  systemd:
+    daemon_reload: false
+
+- name: fix Network - ensure systemd timer is installed but disabled
+  systemd:
+    name: systemd-networkd-check-and-fix.timer
+    enabled: false