How to check all the sensors (a Nagios plugin)
Ever fancied a Nagios plugin to check all the sensors on the host without any hassle? Try this one, it collects all the sensors’ input values, compares it to their […]
Author: Vladimir Melnik
How to determine on which hop your datagrams are being lost without the mtr utility
Sometimes you need to detect which host loses IP-packets being sent by you. It’s good when you can use the mtr utility, but what to do if you can’t install it?
IP-address Round-Robin for Postifx
Here’s a short and pretty self-desctriptive recipe to make your Postfix to send outgoing messages from different IP-addresses switching them on a round-robin basis. First of all, we’ll need the […]
Did you foresaw your future life when you were younger?
At some point you may start to realize that you had foreseen all your furure life and all future events in the world around you quite a long time ago. […]
Living my music
I really love music! I love to listen music, to feel it, to compose my tunes and to play them. I’m pretty sure that principles of musical harmonies, chords and […]
Virtualization Cluster Network in a Nutshell
To be honest, I’m not keen on drawing diagrams, but today I had to spend a couple of hours to sketch this one. It was needed to illustrate Ethernet-links between […]
A simple todo list for your shell
This simple script lists today’s tasks every time you log in (or create a new window in your screen).
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# Just add me to your .bashrc: # [ -x ~/.bashrc_today ] && . ~/.bashrc_today TODAYD="${HOME}/.today.d" if [ ! -d "${TODAYD}/today" ]; then mkdir -p "${TODAYD}/today" fi TODAY=$(date +%F) function toDay() { local DAY=${1}; shift; local CARD=${1}; shift; local TODO=${*} ( if [ ! -d "${TODAYD}/${DAY}" ]; then mkdir -p "${TODAYD}/${DAY}" fi ) && ( echo "${TODO} [+${TODAY}]" >> "${TODAYD}/${DAY}/${CARD}" ) && ( echo -n "${TODAYD}/${DAY}/${CARD}: " cat "${TODAYD}/${DAY}/${CARD}" ) } echo -n -e "Today is \033[0;36m$(date +%A)\033[0m, \033[0;35m${TODAY}\033[0m" if [ -d "${TODAYD}/${TODAY}" ] && STUFF=$(ls "${TODAYD}/${TODAY}") && [ -n "${STUFF}" ]; then for CARD in ${STUFF}; do (cat "${TODAYD}/${TODAY}/${CARD}" >> "$TODAYD/today/${CARD}") && rm -f "${TODAYD}/${TODAY}/${CARD}" done rmdir "${TODAYD}/${TODAY}" fi if [ -d "${TODAYD}/today" ] && STUFF=$(ls -X "${TODAYD}/today/") && [ -n "${STUFF}" ]; then echo \ and here\'s what to do: for CARD in ${STUFF}; do echo -n -e " * \033[1;33m(\033[1;37m${CARD}\033[1;33m)\033[0m " cat "${TODAYD}/today/${CARD}" done echo Good luck! else echo , don\'t you know what to do? =\) fi echo |
Adding a new task is as easy as typing something […]
Maintenance works without drama: how to inform visitors when the server has been shut down
Sometimes you need to shut some web-services down for a while to do some maintenance works. Of course, you have warned all users about the scheduled downtime period, but what […]
How to check some host by arping without looking up the corresponding network interface?
Sometimes you have to check if some host replies on ARP “who-has” requests instead of simply pinging it. You probably need it when the host has its firewall configured to […]
How to restart some service when server’s load average goes high as fuck
This post’s name and script’s comments are pretty descriptive, right? 🙂
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#!/bin/bash # # Just put it to your crontab: # # * * * * * root /root/bin/lalala.sh --la1 50 --la5 20 --laf 10 --service httpd --kill --process httpd # # It will kill all httpd processes and restart httpd service when LA1 becomes greater or equal to 50, LA5 - to 20 and LA15 - to 10 # PATH=/bin:/sbin:/usr/bin OPTS=$(getopt -n $(basename ${0}) -o 1:5:f:s:kp: -l la1:,la5:,laf:,service:,kill,process: -- "${@}") if [ "${?}" -ne 0 ]; then echo "Can't get options" >&2 exit 1 fi eval set -- "${OPTS}" while :; do case "${1}" in -1|--la1) THR1="${2}"; shift 2;; -5|--la5) THR5="${2}"; shift 2;; -f|--laf) THR15="${2}"; shift 2;; -s|--service) SERVICE="${2}"; shift 2;; -k|--kill) KILL="1"; shift 1;; -p|--process) PROCESS="${2}"; shift 2;; --) shift; break;; *) echo "Can't recognize the option: ${1}"; exit 1;; esac done if [ -z "${SERVICE}" ]; then echo "Can't understand what service shall I restart" >&2 exit 1 fi if [ "${KILL}" ] && [ -z "${PROCESS}" ]; then echo "Can't understand what process shall I kill" >&2 exit 1 fi LA=$( uptime | sed -r 's/^.*load average: ([0-9]+)(\.[0-9]+)?, ([0-9]+)(\.[0-9]+)?, ([0-9]+)(\.[0-9]+)?$/\1\t\3\t\5/g' ) LA1=$( echo "${LA}" | cut -f1) LA5=$( echo "${LA}" | cut -f2) LA15=$(echo "${LA}" | cut -f3) if [ -n "${THR1}" ] && [ -n "${LA1}" ] && [ "${LA1}" -ge "${THR1}" ] && [ -n "${THR5}" ] && [ -n "${LA5}" ] && [ "${LA5}" -ge "${THR5}" ] && [ -n "${THR15}" ] && [ -n "${LA15}" ] && [ "${LA15}" -ge "${THR15}" ]; then if [ "${KILL}" ]; then while PIDS=$(pidof ${PROCESS}); do echo "Slaying ${PIDS}..." kill -9 ${PIDS} sleep 1 done sleep 10 else service "${SERVICE}" restart fi fi |
Of course, you can get all further updates of this script from GitHub: https://gist.github.com/melnik13/04225e4e60a8d66f9ab6. Now you can sleep […]