HW monitor
 
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1. INSTALL

Run "make" at first, you can find the "hwmonitor" and "hwclient" bin files. Copy the floowing file to your prefix path: 

  hwmonitor
  hwclient
  hwmonitor.conf
  hwclient.conf

For example, I copy these into "/server/hwmonitor".

2. MAKE A HWMONITOR DAEMON
(How can I run a predefine command remotely)

  • Modify <config-file-install-path>/hwmonitor.conf, change "listen_ip" and "listen_port" in [global] group, append/modify some predefine command in [command] group if you need. 
      (FORMAT: <predefine-command> = <real command line>)
  hw_date = date

  • Run "<install-path>/hwmonitor <config-file-install-path>/hwmonitor.conf", for example: 
      /server/hwmonitor/hwmonitor /server/hwmonitor/hwmonitor.conf
  • hwmonitor daemon listened on listen_ip/listen_port, and you can telnet to this ip/port, input your predefine command to get the real command output message remotely.

    For example, run predefine command "hw_date" (real command is 'date') and get the date info from remote server: 

      root@game:~# telnet 172.16.1.210 1000
  Trying 172.16.1.210...
  Connected to 172.16.1.210.
  Escape character is '^]'.
  hw_date
  Thu Feb 23 11:10:57 HKT 2012
  Connection closed by foreign host.
  root@game:~#
    Line "Thu Feb 23 11:10:57 HKT 2012" is the output. I use this function to confirm each server time is sync (Write a shell or PHP/ruby/perl/etc. command to connect to each hwmonitor listen_ip/port, get the info and show me at once. read FAQ document for the detail.)

  • NOTE: use iptables/ipchains to protect hwmonitor listen port by yourself, or only listen on internal IP.

    3. MAKE A HWCLIENT DAEMON
    (How can I get the server load average and IO idle value into a text file. How can I use "hwclient" )

    I just wont to know each server information at first, and, "Can I use hwmonitor to know each remote-server worked fine? I'm not 24 hours online, let it do something, use a simple client to get server load average' each 60 seconds and write the info into a text file ...", so "hwclient" to appear.

    "hwclient" is a extend function, get remote-server load average (from "top" command output) and IO idle (from "iostat" command output) each 60 seconds. It connect to multi remote-server(define servers into the hwclient.conf [monitor_server] group) and write the information to different file.

    -- * hwclient depend on 'sed' and 'iostat' command, confirm these commands exist. * --

  • Telnet to hwmonitor listen_ip/port, input "hw_average" predefine command: 
      root@game:~# telnet 172.16.1.210 1000
  Trying 172.16.1.210...
  Connected to 172.16.1.210.
  Escape character is '^]'.
  hw_average
  0.00,0.10,0.07,1,94.31,2012-02-23,11:54:43
  Connection closed by foreign host.
  root@game:~#
    Output info like:
      "0.00,0.10,0.07,1,94.31,2012-02-23,11:54:43"
    if the string like:
      "0.00,0.10,0.07,1,,2012-02-23,11:54:43" (The five value empty)
    check the "iostat" command exist (include in 'sysstat' package).

  • Modify <config-file-install-path>/hwclient.conf, change "save_path" in [global] group, add/modify "server" line in [monitor_server] group, line format is : "<display name>, <ip>, <port>, <send command>", for example: 
      server = web1, 172.16.1.210, 1000, hw_average
    • <display name>: hwclient write remote-server info into the save_path and the filename is "<display-name>_<ip>_<date>.log", (like: web1_172.16.1.210_2012-02-23.log), split-character is "_" so don't use it in <display_name> (hwclient drop the "_" char automatic).
    • <ip>: remote-server ip.
    • <port>: remote-server hwmonitor listen port.
    • <send command>: default set is "hw_average", you can find in hwmonitor.conf, the real-comand is a PIPE bash shell-group.

    o. Run "/hwclient /hwclient.conf", for example: 

      /server/hwclient/hwclient /server/hwmonitor/hwclient.conf
    Check the "save_path", you can find remote-server info text file exist, hwclient append a "hw_average" info line each 60 seconds, That's ok.

    4. MAKE A LOAD-AVERAGE/IO IDLE CHART
    (hwclient only have some output-data, I need a chart -- use hwgraphic PHP extend module)

    hwgraphic is hwmonitor [http://hwmonitor.sf.net] extend module and use to show the server load-average/IO idle chart, it writen in PHP.

    o. Copy hwgraphic_PHP/* into you webroot. modify the config.php: 

      $P_dataPath = "/data/webroot/www/hwmonitor_data";
      Replace it same to hwclient.conf -> [global] -> save_path.

    o. Visit http://hwgraphic-install-url/list.php

    -- Cheng Dong [ ccdong[-at-]gmail[dot]com ] [ http://hwmonitor.sf.net]
     
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