Alexander Schäferdiek
71977c9dca
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82 lines
2 KiB
Bash
Executable file
82 lines
2 KiB
Bash
Executable file
#!/usr/bin/env bash
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# usage
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usage() {
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USAGE=$(cat <<EOF
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Usage: memory_usage_alert [CONFIG_FILE (absolute path)]
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Checks available memory and sends out notification via mail. Please see man memory_usage_alert.
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EOF
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)
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echo "$USAGE";
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}
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set -e;
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MEMORY_USAGE_ALERT_MAIL_ADDRESS="";
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MEMORY_USAGE_ALERT_THRESHOLD=512;
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# check for config file
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apply_config() {
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local config=$1;
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if [[ ! -f "$config" ]]; then
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echo "No config file specified";
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echo "";
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usage;
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exit 1;
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fi
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set -a;
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# shellcheck disable=SC1090
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source "$config";
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set +a;
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}
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source_config() {
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local config=$1;
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local configFallback=$2;
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local configGlobalFallback=$3;
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if [[ -f "$config" ]]; then
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apply_config "$config";
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return;
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fi
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if [[ -f "$configFallback" ]]; then
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apply_config "$configFallback";
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return;
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fi
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if [[ -f "$configGlobalFallback" ]]; then
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apply_config "$configGlobalFallback";
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return;
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fi
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}
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check_required() {
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type hostname &> /dev/null || { echo "Requiring 'hostname' but it's not installed"; exit 1; }
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type mailx &> /dev/null || { echo "Requiring 'mailx' but it's not installed"; exit 1; }
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type free &> /dev/null || { echo "Requiring 'free' but it's not installed"; exit 1; }
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}
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source_config "$1" "$HOME/.memory_usage_alert.conf" "/etc/memory_usage_alert.conf"
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check_required
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HOSTNAME=$(hostname)
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SUBJECT="[memory $HOSTNAME] memory is low"
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# DO NOT TOUCH BELOW
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total=$(free -mt | grep Total | awk '{print $2}')
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used=$(free -mt | grep Total | awk '{print $3}')
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# shellcheck disable=SC2004
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free=$(($total-$used))
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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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