Commands tagged monitoring (17)

  • Monitor open connections for httpd including listen, count and sort it per IP

    It's not my code, but I found it useful to know how many open connections per request I have on a machine to debug connections without opening another http connection for it. You can also decide to sort things out differently then the way it appears in here. Show Sample Output


    18
    watch "netstat -plan|grep :80|awk {'print \$5'} | cut -d: -f 1 | sort | uniq -c | sort -nk 1"
    ik_5 · 2010-03-15 09:27:43 12
  • List files accessed by a command

    Can be run as a script `ftrace` if my_command is substrituted with "$@" It is useful when running a command that fails and you have the feeling it is accessing a file you are not aware of. Show Sample Output


    17
    strace -ff -e trace=file my_command 2>&1 | perl -ne 's/^[^"]+"(([^\\"]|\\[\\"nt])*)".*/$1/ && print'
    unixmonkey8046 · 2011-08-16 15:00:18 10
  • Cheap iftop

    Shows updated status in a terminal window for connections to port '80' in a human-friendly form. Use 'watch -n1' to update every second, and 'watch -d' to highlight changes between updates. If you wish for status updates on a port other than '80', always remember to put a space afterwards so that ":80" will not match ":8080". Show Sample Output


    7
    watch 'netstat -anptu |egrep "^Proto|:80 "'
    Mozai · 2011-05-18 15:05:52 27
  • whowatch: Linux and UNIX interactive, process and users monitoring tool

    whowatch is a interactive, ncurses-based, process and users monitoring tool, which updates information in real time. This is a perfect tool for local and remote servers. It displays information about the users currently logged on to the machine, in real-time. Besides standard information (login name, tty, host, user's process), the type of the connection (ie. telnet or ssh) is shown. Display of users command line can be switch to tty idle time. Certain user can be selected and his processes tree may be viewed as well as tree of all system processes. Tree may be displayed with additional column that shows owner of each process. In the process tree mode SIGINT and SIGKILL signals can be sent to the selected process. Killing processes is just as simple and fun as deleting lines on the screen.


    4
    whowatch
    cryptema · 2011-06-30 22:45:39 7
  • Output system statistics every 5 seconds with timestamp

    See man vmstat for information about the statistics. This does the same thing without the timestamp: vmstat 5 Show Sample Output


    3
    while [ 1 ]; do echo -n "`date +%F_%T`" ; vmstat 1 2 | tail -1 ; sleep 4; done
    plasticboy · 2009-03-26 19:16:55 14
  • Monitor incoming connections of proxies and balancers.

    Maybe this will help you to monitor your load balancers or reverse proxies if you happen to use them. This is useful to discover TIME OUTS and this will let you know if one or more of your application servers is not connected by checking. Show Sample Output


    2
    watch -n 1 "/usr/sbin/lsof -p PID |awk '/TCP/{split(\$8,A,\":\"); split(A[2],B,\">\") ; split(B[1],C,\"-\"); print A[1],C[1],B[2], \$9}' | sort | uniq -c"
    ideivid · 2011-08-12 19:16:38 4
  • Testing ftp server status

    I must monitorize a couple of ftp servers every morning WITHOUT a port-scanner Instead of ftp'ing on 100 ftp servers manually to test their status I use this loop. It might be adaptable to other services, however it may require a 'logout' string instead of 'quit'. The file ftps.txt contains the full list of ftp servers to monitorize.


    1
    for host in $(cat ftps.txt) ; do if echo -en "o $host 21\nquit\n" |telnet 2>/dev/null |grep -v 'Connected to' >/dev/null; then echo -en "FTP $host KO\n"; fi done
    vlan7 · 2010-01-26 15:34:18 4
  • Monitor changed files into a log file, with day rotation, using fswatch (MacOS)

    This command monitors changes in the current folder structure (subfolders included) and files, and log it into a hidden file in the same folder, called `.file_changes_YYMMDD.log`. Modify the `--exclude` parameters to define what should be skipped. Show Sample Output


    1
    fswatch --exclude=.git/* --exclude=.settings --event-flags --event-flag-separator=\; -t -f '%Y-%m-%d %H:%M:%S' . >> ./.file_changes_$(date +"%Y-%m-%d" | sed s/-//g).log
    paulera · 2023-08-17 23:06:30 203
  • Monitor especific process with top

    You can also use different process using comma: top -p `pgrep pidgin`, `pgrep python` but you have to make sure the process exists or you'll get an error Show Sample Output


    0
    top -p `pgrep pidgin`
    cesarbustios · 2011-11-23 20:35:53 4
  • Monitoring file change while a copy

    Sometime you need to monitor file or direcory change in dimension or other attributes. This command output file (called myfile in the example) attributes in the top of the screen, updating each 1 second. You should change update time, command ( e.g., ls -all ) or target ( myfile, mydir, etc...). Show Sample Output


    0
    while true; do ls -all myfile; spleep 1; clear; done
    ivodeblasi · 2013-03-26 09:13:19 5
  • Monitoring file change while a copy


    0
    watch "ls -al myfile"
    tonk · 2013-05-08 12:40:40 6
  • Monitor open connections for httpd including listen, count and sort it per IP

    Doesn't list connections to other ports than port 80. Not f.e. 8080 or 8091. Excludes programs listening for connections, like your favorite webserver.


    0
    watch "netstat -plan | grep -v LISTEN | grep \":80 \" | awk {'print \$5'} | cut -d: -f 1 | uniq -c | sort -nk 1"
    simonsimcity · 2013-09-05 13:50:00 12
  • List user processes with their memory usage and total usage.

    Add up the amount of memory your processes are using and display the total. Replace marcanuy with your desired username. Show Sample Output


    0
    ps -u marcanuy -o pid,rss,command | awk '{print $0}{sum+=$2} END {print "Total", sum/1024, "MB"}'
    marcanuy · 2013-11-20 01:21:59 7
  • Resource Monitoring

    Monitoring system in one line : DISK : disk space MEM: memory ( mem , swap, Total) CPU : all information about cpu activity LOAD : load average Show Sample Output


    0
    echo "DISK:";df -Pl | grep -v "Filesystem" | awk '{print $5,$6}' ; echo "MEM:" ; free -mto | awk '{ print $1,$2,$3,$4 }'; echo "CPU:"; top -b -d1 -n1 | grep Cpu | awk '{print $2,$3,$4,$5,$6,$7,$8,$9}';echo "LOAD:"; cat /proc/loadavg
    injez · 2014-09-29 12:43:52 36
  • Human readable docker stats output

    Show Sample Output


    0
    docker stats --no-stream $( docker ps -q ) | sed -e "$( docker ps --format "{{.ID}} {{.Names}}" | sed -e "s/\(.*\) \(.*\)/s\/\1\/\2\t\/g;/" )"
    gtron · 2016-04-14 15:20:13 22
  • Start monitoring your server with a single curl command.

    activate the first alert and the next ones are activated automatically. Show Sample Output


    0
    curl ping.gl
    wuseman1 · 2022-10-15 13:24:45 874
  • Monitoring TCP connections number

    Monitoring TCP connections number showing each state. It uses ss instead of netstat because it's much faster with high trafic. You can fgrep specific ports by piping right before awk: watch "ss -nat | fgrep :80 | awk '"'{print $1}'"' | sort | uniq -c" Show Sample Output


    -1
    watch "ss -nat | awk '"'{print $1}'"' | sort | uniq -c"
    ricardofunke · 2012-12-07 19:07:33 9

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Edit a script that's somewhere in your path.
Often I need to edit a bash or perl script I've written. I know it's in my path but I don't feel like typing the whole path (or I don't remember the path).

Get rid from a blank display without reboot
Killall5 will kill your session and redirect to login screen. -Very useful when suffering display problems. -Can use F1-F6 -Need to login in the particular console if not already

List the size (in human readable form) of all sub folders from the current location
Sorted in human readable format.

grep -v with multiple patterns.
Use multiple patterns with grep -v. So you can print all lines in a file except those containing the multiple patterns you specify.

Burn an ISO on commandline with wodim instead cdrecord

create an screenshot, upload it to your server via scp and then open that screenshot in firefox
I often need to send screenshots to other people to explain settings and whatever. So I created this oneline which I use to create the screenshot with imagemagik, upload it via scp to my server and then the command opens an firefox tab with the screenshot. The screenshot can be a region or a window. You just have to replace the parts beginning with YOUR.

Control ssh connection
SSH can be controlled trough an ~ escape sequence. Example, to terminate the current ssh connection, type a newline, then the ~ character, and last a . character. This is useful eg when an ssh connection hangs after you reboot a machine and the connection hangs.

find the biggest files recursively, no matter how many
This command will find the biggest files recursively under a certain directory, no matter if they are too many. If you try the regular commands ("find -type f -exec ls -laSr {} +" or "find -type f -print0 | xargs -0 ls -laSr") the sorting won't be correct because of command line arguments limit. This command won't use command line arguments to sort the files and will display the sorted list correctly.

Create user add lines from partial passwd file
Handy if you are installing a new server or recovering an old one and you have a passwd file with the accounts you want to add to the server. If you edit the file so that only the accounts that you want to add are left this line will spit out the correct useradd lines. The uid, gecos and shell will be preserved.

Sharing file through http 80 port
From the other machine open a web navigator and go to ip from the machine who launch netcat, http://ip-address/ If you have some web server listening at 80 port then you would need stop them or select another port before launch net cat ;-) * You need netcat tool installed

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