/ CACTI

Getting Started with Cacti

I’m going to try this again. I’ve tried to install Cacti once before and had difficulty. Hopefully I can be more successful. I don’t know much about PHP so hopefully that won’t matter.

These steps are a mix of my adventure and my attempt to document how to setup cacti on Oracle Enterprise Linux 5.5

  1. Install Required Packages
    • Run the commands 
       sudo yum install
 sudo yum install httpd
 sudo yum install php
 sudo yum install php-mysql
 sudo yum install php-snmp
 sudo yum install mysql
 sudo yum install mysql-server
 sudo yum install net-snmp
 sudo yum install net-snmp-utils
  2. Verify that httpd and mysqld
    • httpd and mysqld are configured for auto startup by default
  3. Configure PHP
    • Verify modules are loaded $ php -m
    • Trouble. When I run the command, I get a list of errors like the following for (dbase.so, gd.so, ldap.so, mysql.so, mysqli.so, pdo.so, pdo_mysql.so, pdo_sqlite.so, snmp.so) 
       PHP Startup:
 Unable to load dynamic library /etc/php.d/msql.so:
 cannot open shared object file:
 No such file or directory in Unknown on line 0
    • It’s looking for the file /etc/php.d/msql.so but that file lives in /usr/lib64/php/modules/
    • Point where the modules are and restart apache 
       vi /etc/php.ini
 # Change the line to
 extension_dir = "/usr/lib64/php/modules"
 # Restart apache
 /usr/sbin/apachectl stop
 /usr/sbin/apachectl start
    • More errors. I’m still getting the errors 
       PHP Warning: PHP Startup:
 Unable to load dynamic library '/usr/lib64/php/modules/msql.so' -
 /usr/lib64/php/modules/msql.so: cannot open shared object file:
 No such file or directory in Unknown on line 0 PHP Warning:
 Module 'snmp' already loaded in Unknown on line 0
    • Let’s look in php.ini. 
       grep ^#*ex /etc/php.ini
 expose_php = On
 #extension_dir = "/etc/php.d"
 extension_dir = "/usr/lib64/php/modules"
 extension=msql.so
 extension=snmp.so
    • I see where I changed the extension_dir. But I also see two explicit extensions. One for msql and snmp. Hmm those match my errors. I wonder if that could be the issue. I’m going to comment them out.
    • That got rid of the errors.
    • At this point running the command php -m shows all the modules are loaded. I’m not too sure if PHP is configured properly though :(
  4. Configure Apache
    • Looks like it was already configured
  5. Configure MySql
    • Set Admin Password and Create Cacti Schema. (Replace MY_PASSWORD with whatever password you want) 
       mysqladmin --user=root password MY_PASSWORD
 mysqladmin --user=root --password reload
 mysqladmin --user=root --password=MY_PASSWORD create cacti
  6. Install Cacti
    • Create new user 
       useradd cactiuser
 groupadd cacti
 usermod -a -G cacti cactiuser
    • Setup Folder Structure 
       mkdir /opt/cacti
 cd /opt/cacti
 wget http://www.cacti.net/downloads/cacti-0.8.7g.tar.gz
 tar xzvf cacti-0.8.7g.tar.gz
 ln -s /opt/cacti/current/ /opt/cacti/cacti-0.8.7g
 chomod cactiuser:cacti -R /opt/cacti
  7. Verify Cacti Installation
    • Navigating to http://hostname/cacti/ returned a 404
    • Need to made a symbolic link 
       ln -s /var/www/html/cacti /opt/cacti/current
    • Now when I navigate to http://hostname/cacti/ I get the following error: 
       FATAL: Cannot connect to MySQL server on 'localhost'.
 Please make sure you have specified a valid MySQL database name
 in 'include/config.php'
    • Looking at the file, I put the password in wrong. But I now see the Cacti Installation Screen. I’m so happy.
  8. Cacti Web Installation Wizard
    • I clicked next
    • Selected New installation
    • The next screen has a lot of invalid file paths. Really?
      • invalid path: rrdtool
      • invalid path: snmpwalk
      • invalid path: snmpget
      • invalid path: snmpbulkwalk
      • invalid path: snmpgetnext
    • Install rddtools 
       sudo yum install cairo-devel libxml2-devel pango-devel pango libpng-devel freetype freetype-devel libart_lgpl-devel
 cd /opt sudo wget http://oss.oetiker.ch/rrdtool/pub/rrdtool-1.4.5.tar.gz
 sudo tar -zxvf rrdtool-1.4.5.tar.gz
 cd rrdtool-1.4.5
 # export PKG_CONFIG_PATH=/usr/lib/pkgconfig/ ./configure --prefix=/usr/local/rrdtool
 sudo make
 sudo make install
 cp /opt/rrdtool-1.4.5/bin/* usr/local/bin/
    • Install snmpwalk
      • After looking around I need to install net-snmp-utils. I added this to the initial installation items above. Lame.
  9. Done! Cacti

I’ll configure cacti in another post. This was too much to get it installed.

Extra

  1. Install MySql Workbench
    • Download and install 
       sudo dpkg -i mysql-workbench-gpl-5.2.32-1ubu1010-i386.deb
 # It said I had missing references. libzip1 and python-pysqlite2
 apt-get -f install
 sudo dpkg -i mysql-workbench-gpl-5.2.32-1ubu1010-i386.deb
 # No issues
    • Mysql workbench is now in the Menu Items
    • When I attempt to connect though I’m told my desktop isn’t allowed to connect. Oh well, save for a future post.

Notes

  • The commands for link service and chkconfig live in /sbin directory.
  • Prepare first by creating service accounts for cacti

Resources

MySql Admin Tool Install Cacti on Linux (Not too helpful) Installing MySQL and getting running Add a user to group Add user and groups Install rrdtool on Red Hat