65 lines
1.8 KiB
Text
65 lines
1.8 KiB
Text
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#!/usr/bin/env bash
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# usage
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usage() {
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USAGE=$(cat <<EOF
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Usage: memory_usage_alert [CONFIG_FILE (absolute path)]
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If no CONFIG_FILE is given, HOME/.memory_usage_alert.conf is used. This fallback option
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has to exist or the script will exit.
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Configuration can be done in any file and any pre-defined variable can be overwritten.
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The following are at least required for the script to work:
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- MEMORY_USAGE_ALERT_MAIL_ADDRESS="" // mail.rc has to be configured
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The following are optional or have reasonable defaults:
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- MEMORY_USAGE_ALERT_THRESHOLD=128 // threshold to warn about (in megabytes)
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You can copy this script to '/usr/local/bin' and use create a custom CONFIG_FILE as user. Examples can be found in '/usr/share/doc/<scriptname>'.
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EOF
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)
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echo "$USAGE";
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}
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set -e;
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HOSTNAME=$(hostname)
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SUBJECT="[memory $HOSTNAME] memory is low"
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MEMORY_USAGE_ALERT_MAIL_ADDRESS="";
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MEMORY_USAGE_ALERT_THRESHOLD=128;
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# check for config file
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source_config() {
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local config=$1;
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local configFallback=$2;
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if [[ ! -f "$config" ]]; then
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if [[ ! -f "$backupConfigFileFallback" ]]; then
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echo "No config file specified and could not find default in '$configFallback'!";
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echo "";
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usage;
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exit 1;
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else
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config=$configFallback;
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fi
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fi
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set -a;
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source "$config";
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set +a;
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}
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source_config "$1" "$HOME/.memory_usage_alert.conf"
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# DO NOT TOUCH BELOW
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free=$(free -mt | grep Total | awk '{print $4}')
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if [[ "$free" -le $MEMORY_USAGE_ALERT_THRESHOLD ]]; then
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ps -eo pid,ppid,cmd,%mem,%cpu --sort=-%mem | head >/tmp/top_proccesses_consuming_memory.txt
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file=/tmp/top_proccesses_consuming_memory.txt
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echo -e "Memory on $HOSTNAME is running low ($MEMORY_USAGE_ALERT_THRESHOLD MB is the remaining threshold)!\n\nFree memory: $free MB" | mailx -a "$file" -s "$SUBJECT" "$MEMORY_USAGE_ALERT_MAIL_ADDRESS"
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fi
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exit 0
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