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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.

Usage Example

I run several services in my linux environment that depend on data on a network share to function. Occasionally that share goes offline for some reason. This script was written to ensure those services are shut down when the mount point becomes unavailable.

Basic Concept

  1. Crontab that runs this script regularly
  2. 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 the git repository:

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

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: bash 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.