Mount-Point-Service-Sync

Intro

Plex kept shitting the bed every time the SMB share randomly dropped offline. After getting sick of jumping in to fix it manually over and over, I hacked together a script that shuts down the Plex service when the share bails, tries to remount the damn thing, and fires Plex back up once the share is stable again.

MPSS (Mount Point Service Sync)

=====================================

MPSS dynamically controls start/stop of services (plexmediaserver, tdarr_node, Tdarr_Uptime, emby-server) based on presence or absence of "MOUNT_POINT_ALIVE" file on a network share. It logs actions to /var/log/mpss.log and trims the log to 200 lines.

Basic Concept

Crontab that runs this script regularly
Script checks for a file on the network share
- If it does, ensure the service is running
- If it does not, ensure the service is stopped

Setup

Step 1: Download the Script

Download the script from this git repository:

mkdir /opt/mpss
git clone https://github.com/tebwritescode/mpss.git
cp ./mpss/mpss.sh /opt/mpss/mpss.sh

Copy-Pasta is also an option

#!/bin/bash
#MPSS - Mount Point Service Sync
# Disables/Enables plexmediaserver, tdarr_node service based on the existance of
# a file on the network share

FILE="/path/to/mount/MOUNT_POINT_ALIVE" #The location of the file on the share
SERVICE="service" #Service that can be started/stopped with systemctl
LOG_FILE="/var/log/mpss.log" #Where to save the log
MAX_LINES=200 #How many lines of logs to keep in the log file

# Get the current number of lines in the log file
CURRENT_LINES=$(wc -l < "$LOG_FILE")

# If there are more than MAX_LINES, truncate the file to keep only the last MAX_LINES lines
if [ $CURRENT_LINES -gt $MAX_LINES ]; then
    echo "$(date) INFO: MPSS: Trimming log file" >> /var/log/mpss.log 2>&1
    tail -n $MAX_LINES $LOG_FILE >> mpss-temp.log
    mv mpss-temp.log "$LOG_FILE"
fi

echo "$(date) INFO: MPSS: Attempting to mount all" >> /var/log/mpss.log 2>&1
sudo mount -a >> /var/log/mpss.log 2>&1

if [ -e "${FILE}" ]; then
    # Start the service if the file exists
    echo "$(date) INFO: MPSS: ${FILE} found! Checking if ${SERVICE} is active and if it isn't starting it." >> /var/log/mpss.log 2>&1
    sudo systemctl is-active --quiet $SERVICE >> /var/log/mpss.log 2>&1 || systemctl start $SERVICE >> /var/log/mpss.log 2>&1
else
    # Stop the service if the file does not exist
    echo "$(date) INFO: MPSS: ${FILE} not found! Checking if ${SERVICE} is active and if it is stopping it." >> /var/log/mpss.log 2>&1
    sudo systemctl is-active --quiet $SERVICE >> /var/log/mpss.log 2>&1 && systemctl stop $SERVICE >> /var/log/mpss.log 2>&1
fi

Step 2: Customize the Script

Customize the script by modifying the variables at the top of the file:

nano /opt/mpss/mpss.sh

Modify FILE, SERVICE, LOG_FILE, and MAX_LINES to match your setup.

Example:

FILE="/path/to/mount/MOUNT_POINT_ALIVE" #The location of the file on the share
SERVICE="plexmediaserver" #Service that can be started/stopped with systemctl
LOG_FILE="/var/log/mpss.log" #Where to save the log
MAX_LINES=200 #How many lines of logs to keep in the log file

Save your changes with ctrl + x, then y, then return.

Step 3: Create the Log File

Create the log file:

touch /var/log/mpss.log

Step 4: Create the Check File

Create the check file on the network share:

touch /path/to/mount/MOUNT_POINT_ALIVE

Step 5: Make the Script Executable

Make the script executable:

chmod +x /opt/mpss/mpss.sh

Step 6: Schedule the Script with Crontab

Schedule the script to run regularly using crontab. Add the following line to your crontab file (use crontab -e to edit):

*/1 * * * * /opt/mpss/mpss.sh

Note: Be aware that some versions of cron do not support all times you can create on crontab.guru, you will get an error when saving the file.

That's it! Your MPSS script should now be set up to automatically start/stop services based on the presence or absence of the MOUNT_POINT_ALIVE file on your network share.