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anamorph/HOWTO Install Cacti on AWS EC2 Instance running Amazon Linux.md

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  2. anamorph created this gist May 7, 2015.
    146 changes: 146 additions & 0 deletions HOWTO Install Cacti on AWS EC2 Instance running Amazon Linux
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    # 0. First install the pre-reqs
    ## 0.1 Installing
    yum install mysql-server mysql php-mysql php-pear php-common php-gd php-devel php php-mbstring php-cli php-snmp php-pear-Net-SMTP php-mysql httpd -y

    ## 0.2 Configuring services
    chkconfig mysqld on
    chkconfig httpd on
    service mysqld start
    service httpd start

    ## 0.3 Configuring MYSQLD
    mysqladmin -u root password %your_password%
    mysql -uroot -p mysql
    mysql> create database cacti;
    mysql> grant all on cacti.* to cacti identified by 'cacti';
    mysql> flush privileges;
    mysql> quit

    # 1. Installing and configuring SNMPD
    ## 1.1 Installing

    yum install net-snmp-utils php-snmp net-snmp-libs -y

    ## 1.2 Configuring

    vi /etc/snmp/snmpd.conf (modify to match as follows):

    ####
    # First, map the community name "public" into a "security name"

    # sec.name source community
    com2sec local localhost public

    ####
    # Second, map the security name into a group name:

    # groupName securityModel securityName
    group MyRWGroup v1 local
    group MyRWGroup v2c local
    group MyRWGroup usm local

    ####
    # Third, create a view for us to let the group have rights to:

    # Make at least snmpwalk -v 1 localhost -c public system fast again.
    # name incl/excl subtree mask(optional)
    view all included .1 80

    ####
    # Finally, grant the group read-only access to the systemview view.

    # group context sec.model sec.level prefix read write notif
    access MyRWGroup "" any noauth exact all all none

    ###############################################################################
    # System contact information
    #

    # It is also possible to set the sysContact and sysLocation system
    # variables through the snmpd.conf file:

    syslocation "Running from above, in the Cloud"
    syscontact "me@nuage.ninja"

    Then close the config file and save modifications. Now onto running SNMPD as a service.

    /etc/init.d/snmpd start
    chkconfig snmpd on

    Let's check everything is working fine

    snmpwalk -v 1 -c public localhost IP-MIB::ipAdEntIfIndex

    You should get an output as such

    IP-MIB::ipAdEntIfIndex.127.0.0.1 = INTEGER: 1
    IP-MIB::ipAdEntIfIndex.192.168.3.116 = INTEGER: 2

    # 2. Installing and configuring CACTI
    ## 2.1 Installing

    yum install cacti -y

    Now, let's create the cacti tables from the provided SQL. As I usually don't remember where litterally EVERYTHING is stored in a package, I'll search for it

    find / -name cacti.sql

    Which will get you something like this

    /usr/share/doc/cacti-0.8.8b/cacti.sql

    Let's run this now

    mysql -uroot -p cacti < /usr/share/doc/cacti-0.8.8b/cacti.sql

    ## 2.2 Configuring
    ### 2.2.1 CACTI
    vi /usr/share/cacti/include/config.php

    Make sure the information here matches what we edited in 0.3, close the config file and save modifications.

    ### 2.2.2 HTTPD
    vi /etc/httpd/conf.d/cacti.conf

    I modified that file to be able to log on from anywhere, but you could limit that either by using security groups or CIDR notation in the IfModule section

    <Directory /usr/share/cacti/>
    <IfModule mod_authz_core.c>
    # httpd 2.4
    # Require host localhost
    Require host any
    </IfModule>
    <IfModule !mod_authz_core.c>
    # httpd 2.2
    Order deny,allow
    Deny from all
    # Allow from localhost
    Allow from all
    </IfModule>
    </Directory>

    Then close the config file and save modifications. Now onto running CACTI's poller in crontab.

    vi /etc/cron.d/cacti

    Let's check the config is ok, then remove the leading # as follows:

    #### before

    #*/5 * * * * cacti /usr/bin/php /usr/share/cacti/poller.php > /dev/null 2>&1

    #### after

    */5 * * * * cacti /usr/bin/php /usr/share/cacti/poller.php > /dev/null 2>&1

    Then close the config file and save modifications. Restart cron to start polling into Cacti, and restart httpd to take all our modifications into account.

    service crond restart
    service httpd restart

    ### 2.2.3 WEB INTERFACE

    Now that everything is configured, you can access the web interface at http://%your_host%/cacti/
    The default login/password is admin/admin; you will be asked to change it upon the first login.

    Enjoy !