add post

Author: Patrick M

_posts/2025-07-07-automount-systemd-service-.md

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+---
+layout: post
+title: "systemd Remounting Service"
+date: 2025-07-07 -0500
+category: "General"
+tags: "lxc"
+---
+
+## `systemd` Auto-mounting Service
+
+In `systemd`, you can create an remount unit to ensure share stay mounted. This would work perfectly, exepct, LXC does not support this `systemd` unit. So instead I created a service that runs a script, and a timer. Like a cron, but still using `systemd`
+
+It works by adding a file named `unmounted` to the mount folder anchor. When the share is unmounted, this file will be visible. We can test for the file and remount when it's found.
+
+First steps is to make the folder and add the file
+
+```bash
+mkdir /mnt/share
+touch /mnt/share/unmounted
+```
+
+## Create the Timer
+
+I want this to run as a system service, so I'm going to add the units to `/etc/systemd/system`.
+
+```bash
+cd /etc/systemd/system
+nano remount-share.timer
+```
+
+```ini
+[Unit]
+Description=Trigger remount service
+Requires=remount-share.service
+After=network-online.target
+Wants=network-online.target
+
+[Timer]
+OnCalendar=*:0/5
+Persistent=true
+
+[Install]
+WantedBy=timers.target
+```
+
+## Create the Service
+
+Now we can create the service unit
+
+```bash
+nano remount-share.service
+```
+
+```ini
+[Unit]
+Description=Remount unmounted shares
+After=network-online.target
+Wants=network-online.target
+
+[Service]
+Type=oneshot
+ExecStart=/root/remount-share.sh
+```
+
+## Remount Script
+
+We can add the script to the root home directory. I like to put it here because system should be able to access it, and it exists alongside the credentials file.
+
+```bash
+nano /home/root/remount-share.sh
+```
+
+```bash
+#!/bin/bash
+
+SHARE=/mnt/share
+FILE=$SHARE/unmounted
+
+if [ -f "$FILE" ]; then
+ echo "$SHARE unmounted. Attempting to remount..."
+ mount $SHARE
+fi
+```
+
+## Enable Services and Verify
+
+```bash
+systemctl daemon-reload
+systemctl enable remount-share.timer
+systemctl start remount-share.timer
+systemctl status remount-share.timer && systemctl status remount-share.service
+```
+
+## Run a script to do it for me
+
+All of this has been scripted to make it more convenient.
+
+> Don't just take my word for it. Always inspect the code that will be running on your machines, especially from an untrusted and unsigned source.
+{: .prompt-warning }
+
+```bash
+curl https://gist.githubusercontent.com/binarypatrick/c3bf8b572158655f438fa0843ffc9f2f/raw | sudo bash
+```