# Corona 
 
 * corona is Simple and Async SNMP client module.

 * Refer : [corona/CORONA/src/](https://github.com/couplewith/corona/blob/corona-v1/CORONA/src)

#############################################################
#
#    PRE INSTALL GUIDE For Corona Server Monitoring System
#  
#############################################################

 * It would of course be faster just to send one query for all variables,
 * but the intention is to demonstrate the difference between synchronous
 * and asynchronous operation.
 *
 * Niels Baggesen (Niels.Baggesen@uni-c.dk), 1999.
 * couplewith (choi.doo.rip couplewith@yahoo.co.kr) 2003.06
  -------------------------------------------------------------------
 * Original API Source can downloaded at net-snmp.org 
 *  asyncapi module
 *      -- http://www.net-snmp.org/tutorial-5/toolkit/
 *  
 * purporse of Development and Open it.
 *  When i have manage large system.
 *  I need to monitoring without telnet or ssh.
 *
 *  I was seen many of NMS system like Basic mrtg system.
 *  but i was not learning about that  it was so difficult.
 *  so i choose the  RRD and about two years later 
 *  get the version of Corona v2 .

 *  Users for having or managing   large amount  system
 *  i Suggest the some guide line of the Using snmp and RRD tool.
 *
 *  I Want it will be Useful to system engineers.
 *  

#############################################################
##   Corona Server Monitoring System  Ver 2.1
#       Corona was named by 2003
##      Made by Choi doo rip In Seoul Korea
##      couplewith@hanmail.net
#############################################################


For INSTALLATION Needed Kit
   1. RRDTOOL
   2. net-snmp-devlopment-pkg
      or net-snmp-source version

# INSTALL STEPS
#------------------------------------------------
   rrdtool  <-- ftp.fastorama.com/mirrors/rrdtool
   tar xvzf rrdtool-1.0.41.tar.gz
   cd rrdtool-1.0.41
   ./configure --prefix=/usr/local/rrdtool
    make
    make install

#------------------------------------------------
1. For Install net-snmp Development Packages.
   - It's For Free Development  source.
   net-snmp tool be Required  as bellow.
     -> net-snmp-5.0.x
     -> net-snmp-utils-5.0.x
     -> snmp-devel-5.0.x
    or
     -> source net-snmp-src will be OK !
        (www.net-snmp.org -> Download)

   ( old ucd-snmp version is must need to Check !! )

   CHK the package are installed.
    ROOT>find /usr/include -name net-snmp-config.h 
      -> /usr/include/net-snmp/net-snmp-config.h        [for RPM PACKAGE]
      -> /usr/local/include/net-snmp/net-snmp-config.h  [for Source Version ]

   if not rpm -Uvh net-snmp-devel-5.0.6-17.i386.rpm  or install net-snmp-src
   and higher version Will be OK.
     

2. First Compile Corona in $CORONA_HOME/src

   if You'r net-snmp version is
    RPM-version then edit  
      -L/usr/local/lib  -> "" :  need to be Erased !
     gcc -o $1 $1.c -lnetsnmp -lcrypto -lm

   or Source vison then Chk
     gcc -o $1 $1.c -L/usr/local/lib -lnetsnmp -lcrypto -lm 

  [[Compile]]
   make.sh Corona
    -> Comping Coroan.c Corona.h
    -> cp Corona ../bin/
  [[ Chk ]]
   ldd Corona
        libnetsnmp.so.5 => /usr/lib/libnetsnmp.so.5 (0x40021000)
        libcrypto.so.4 => /lib/libcrypto.so.4 (0x4009f000)
        libm.so.6 => /lib/tls/libm.so.6 (0x40190000)
        libc.so.6 => /lib/tls/libc.so.6 (0x42000000)
        libgssapi_krb5.so.2 => /usr/kerberos/lib/libgssapi_krb5.so.2 (0x401b2000)
        libkrb5.so.3 => /usr/kerberos/lib/libkrb5.so.3 (0x401c5000)
        libk5crypto.so.3 => /usr/kerberos/lib/libk5crypto.so.3 (0x40224000)
        libcom_err.so.3 => /usr/kerberos/lib/libcom_err.so.3 (0x40234000)
        libdl.so.2 => /lib/libdl.so.2 (0x40236000)
        libz.so.1 => /usr/lib/libz.so.1 (0x40239000)
        /lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x40000000)

   if  OK  you can get the  Next steps.
  

3. Second  Configure  Enviroments.
  Enviroment File  are can finded in $CORONA_HOME/conf
  -> corona.conf  : HOSTIP          HOSTNAME        SNMP_COMMUNITY   OSNAME
                    xxx.xxx.xxx.xxx target.snmp.com default_com_name LINUX
  -> rrdsnmp.conf
      example)
       if $CORONA_HOME is /svc/web_app/CORONA Then 
       rrdtool /usr/local/rrdtool/bin/rrdtool
       RRDDATA /svc/web_app/CORONA/data
       IMGDIR  /svc/web_app/CORONA/img
   


4. Third  Config Apache and Apache virtual Host

 
   [[ APACHE-install ]]
   #---------------------------------------------------
    - CORONA need to be install Apache with PHP module.


   [[ HTTPD.conf ]]
   #---------------------------------------------------

   NameVirtualHost 111.2xx.333.123
   <VirtualHost 111.2xx.333.123>
      ServerName log.couplewith.xxx
      #  DocumentRoot  /svc/corona/server/support/     #OLD
      DocumentRoot  /svc/web_app/CORONA/support
      ServerAdmin   enkai@enkai.co.kr

      ErrorLog logs/support-error_log
      CustomLog logs/support-access_log common

      <Directory /svc/web_app/CORONA/support/ >

         AuthType Basic
         AuthName "Member Invitation Only"
         AuthUserFile /svc/web_app/CORONA/support/.htpasswd
         Require valid-user

         AllowOverride FileInfo

      </Directory>

   </VirtualHost>

   [[ HTPASSWD ]]
   #---------------------------------------------------
   if you need basic Security authorization.
   
   $APACHE_HOME/bin/htpasswd -c passwordfile username


   [[ PHP- CGI Chk ]]
   #---------------------------------------------------
      $CORONAHOME/support is  Contains Slist.php, Smenu.php, index.php 
       and ./inc/hosts.inc  php script files.
       So, you need to some configuring  environment.
           hosts.inc is that.

      example>
       some check points are correct.

       $CORONAHOME is /svc/web_app/CORONA/img/HTMLS and 
       apache ServerName is  log.couplewith.xxx  and 
 
        $CORONAHOME/data contains two directoryes 
 
          > [couplewith@admin data]$ cd  $CORONAHOME/data
          > [couplewith@admin data]$ ls
          >  group1.co.kr  group2.com

       then 
          <?
           // hosts.inc

           //***********************************
           // For Slist.php
           //***********************************
           $Bdir="/svc/web_app/CORONA/img/HTMLS";
           $Whome="http://log.couplewith.xxx/HTMLS/";
       
       
           //***********************************
           // For Smenu.php
           //***********************************
           $hosts = array("group1.co.kr","group2.com"); 
           ?>
      
    moreover  [./inc/hosts.inc] it's Contets depend on corona.conf
      - you can Catched two files are codependence.
        and Catch the common point for useing or upgrading.
      - I was only to suggest Guideline..
        

5. Fourth Exec Cron Setting

   [[ GENERATE Config File ]]
     $CORONAHOME/conf contains corona.conf and rrdsnmp.conf
     and Modify that.
     
    
   [[ GENERATE html-page File ]]
     execute  Gen_img.pl $CORONAHOME/bin -> perl ./Gen_img.pl

   [[ CRON ]]
   #---------------------------------------------------
   5,10,15,20,25 * * * * /svc/web_app/CORONA/bin/Corona.sh >/dev/null
   30,35,40,45,55,0 * * * * /svc/web_app/CORONA/bin/Corona.sh >/dev/null
   


[ ETC ] 
  USING SNMP-tools like snmpget, snmpwalk, snmpbulkwalk, snmpbulkget ...
  and you can need knowhow  to using that with various Options.
  So, I give some short cut of Using '-O' Options.
#==========================
  USING  SNMP Query 

#snmpwalk  -v 1 -c RCOMSNMP -O n  cass.enkai.co.kr system   <- 1
#snmpwalk  -v 1 -c RCOMSNMP -O b  cass.enkai.co.kr system   <- 2
#snmpwalk  -v 1 -c RCOMSNMP -O f  cass.enkai.co.kr system   <- 3
#snmpwalk  -v 1 -c RCOMSNMP -O Q  cass.enkai.co.kr system   <- 4
#snmpwalk  -v 1 -c RCOMSNMP -O T  cass.enkai.co.kr system   <- 5

1.  n:  print OIDs numerically
      .1.3.6.1.2.1.1.7.0 = INTEGER: 72
2.  b:  do not break OID indexes down
      SNMPv2-MIB::sysServices.0 = INTEGER: 72

3.  f:  print full OIDs on output
     .iso.org.dod.internet.mgmt.mib-2.system.sysServices.0 = INTEGER: 72

4.  Q:  quick print with equal-signs
      SNMPv2-MIB::sysServices.0 = 72

5.  T:  print human-readable text along with hex strings
      SNMPv2-MIB::sysServices.0 = INTEGER: 72