Alexander Schäferdiek
0ee7b03df8
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85 lines
2.2 KiB
Bash
Executable file
85 lines
2.2 KiB
Bash
Executable file
#!/usr/bin/env bash
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# usage
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usage() {
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USAGE=$(cat <<EOF
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Usage: memory_usage_alert [CONFIG_FILE (absolute path)]
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If no CONFIG_FILE is given, HOME/.memory_usage_alert.conf or /etc/memory_usage_alert.conf is used. This fallback option
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has to exist or the script will exit.
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Configuration can be done in any file and any pre-defined variable can be overwritten.
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The following are at least required for the script to work:
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- MEMORY_USAGE_ALERT_MAIL_ADDRESS="" // mail.rc has to be configured
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The following are optional or have reasonable defaults:
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- MEMORY_USAGE_ALERT_THRESHOLD=128 // threshold to warn about (in megabytes)
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You can copy this script to '/usr/local/bin' and use create a custom CONFIG_FILE as user. Examples can be found in '/usr/share/doc/<scriptname>'.
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EOF
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)
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echo "$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=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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source_config "$1" "$HOME/.memory_usage_alert.conf" "/etc/memory_usage_alert.conf"
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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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