Auto restart

This script will try to reboot the computer if set parameters are met. Suitable for Linux based computers.

Requirements

• awk
• cat
• command
• date
• echo
• expr
• grep
• sed
• shutdown
• sleep
• uptime

(commands in bold are not included in commands standardised by POSIX )

Usage

./auto_restart.sh [OPTION]...

Options

• -h, --help Print help text and terminates.
• -c, --cpu <average-load> Sets threshold for average cpu load. Parameter <average-load> needs to be formatted as three float numbers separated by comma (e.g., 0.30,0.15,0.05). The three numbers represent average load for the past 1, 5 and 15 minutes and will be compared to uptime's value. Each given average value has to be lower or equal in order to reboot the computer.
• -n, --network <network-usage> Threshold for network traffic utilization. Interface with the highest traffic utilization will be compared to the <network-usage>. Value <network-usage> is expected to be in bytes per second.
• --net-interval <interval> Interval of measurement of network traffic usage defined by <interval> in seconds. Default value is 30 seconds.
• -p, --proc <processes> List of <processes> that can't be running when attempting to reboot. The list has to be composed of the names of the processes separated by comma.
• -i, --interval <time> Interval in seconds specified by <time> between individual tries to reboot. Default value is 900 seconds.
• -t, --time <end-time> Specifies until what <end-time> should the script try to reboot the PC. It has to be in 24-hour format (e.g., starting the script at 23:00 and setting -t 04:00 will result in 5 hour time window in which the script will try to reboot the system). Default value is "5:00".
• -u, --uptime <time> Sets threshold for uptime. If the computer is running longer than <time> it will try to reboot. Parameter is expected in hours.
• -a, --amount-of-tries <amount> Will only try to restart <amount> of times. Can be combined with --time and --timeout. Whichever of the set parameter is reached first is used. Value <amount> is unlimited by default.
• -o, --timeout <time> Will only try to restart if total time elapsed from the start of the script is lower than <time>. Value is expected in minutes. Can be combined with --time and --amount-of-tries. Whichever of the set parameter is reached first is used. Value <time> is unlimited by default.
• -e, --execute <command> Instead of rebooting, custom <command> will be executed.
• -r, --human-readable Prints network traffic sizes in power of 1000 (e.g., 4.8 M).
• -d, --dry-run Won't reboot if the parameters are met, just prints a message.

Examples

Run Auto restart script in the background. If the network usage is lower than 2 MB/s on average the computer will be restarted. Otherwise the script will try to restart until 5:00 in the morning every 15 minutes (the network traffic measurement length is not included into the interval between tries). Network measures will be printed in human readable form. ./auto_restart.sh -n 2M -i 870 -t 5:00 -r

Line in crontab to restart the computer every day at 4:00 in the morning and check if the CPU load isn't too high in order to detect if the system is in use. If the CPU load is too high, the script will try to restart 6 times every 10 minutes. The output of the script is saved to log file with a dynamically changing date as a name of the log file. 0 4 * * * root /opt/Auto-restart/auto_restart.sh --cpu 2.0,2.0,2.0 --amount-of-tries 6 --interval 600 >> "/opt/Auto-restart/LOGS/$(date +\%Y-\%m-\%d).log"