Installing on CentOS 7

LAMP (Linux, Apache, MySQL/MariaDB, PHP) Required packages

Web Server (Apache)

  1. Enable Epel repo to enable PHP 7.2 package download

    yum install <http://rpms.remirepo.net/enterprise/remi-release-7.rpm> -y
    yum install yum-utils -y
    yum-config-manager --enable remi-php72
  2. Install Apache

    yum install -y httpd
  3. Enable and start the service to ensure it starts when the system reboots

    systemctl start httpd
    systemctl enable httpd

Example configuration file for Apache 2.4 and SSL

This example configuration assumes you have your own certificates already. You should make sure you change the paths to match your setup.

Replace YourOwnCertFile.crt and YourOwnCertFile.key with the names of the files holding your certificate (.crt) and private key (.key).

#
# Cacti: An RRDtool based graphing web application
#

# For security reasons, the Cacti web interface is accessible only to
# localhost in the default configuration. If you want to allow other clients
# to access your Cacti installation, change the httpd ACLs below.
# For example:
# On httpd 2.4, change "Require host localhost" to "Require all granted".
# On httpd 2.2, change "Allow from localhost" to "Allow from all".

<VirtualHost *:443>
    LogLevel warn

    ServerName cacti.yourdomain.com
    ServerAdmin  [email protected]

    DocumentRoot "/var/www/html/cacti"
    Alias /cacti    /var/www/html/cacti
    SSLEngine On
    SSLCertificateFile /etc/ssl/certs/YourOwnCertFile.crt
    SSLCertificateKeyFile /etc/ssl/private/YourOwnCertKey.key

    <Directory /var/www/html/cacti/>
        <IfModule mod_authz_core.c>
                # httpd 2.4
                Require all granted
        </IfModule>
        <IfModule !mod_authz_core.c>
                # httpd 2.2
                Order deny,allow
                Deny from all
                Allow from all
        </IfModule>
    </Directory>

    <Directory /var/www/html/cacti/install>
        # mod_security overrides.
        # Uncomment these if you use mod_security.
        # allow POST of application/x-www-form-urlencoded during install
        #SecRuleRemoveById 960010
        # permit the specification of the RRDtool paths during install
        #SecRuleRemoveById 900011
    </Directory>

    # These sections marked "Require all denied" (or "Deny from all")
    # should not be modified.
    # These are in place in order to harden Cacti.
    <Directory /var/www/html/cacti/log>
        <IfModule mod_authz_core.c>
                Require all denied
        </IfModule>
        <IfModule !mod_authz_core.c>
                Order deny,allow
                Deny from all
        </IfModule>
    </Directory>
    <Directory /var/www/html/cacti/rra>
        <IfModule mod_authz_core.c>
                Require all denied
        </IfModule>
        <IfModule !mod_authz_core.c>
                Order deny,allow
                Deny from all
        </IfModule>
    </Directory>
</VirtualHost>

Database Server

The choice between MySQL server and MariaDB is normally down to the OS maintainers if you use one of the predefined LAMP setup installations. If you are deciding between these yourself, you should research this via your favorite search engine.

Whilst MySQL is the original open source SQL database server created in 1995 which is now owned by Oracle, MariaDB is designed as a drop-in replacement by some of the original MySQL developers / owners. This will likely continue to be a drop-in alternative until there is a major divergence that can not be bridged.

MySQL

  1. Install MySQL server

    yum install -y mysql mysql-server
  2. Enable and start the service to ensure it starts when the system reboots

    systemctl enable mysqld
    systemctl start mysqld

MariaDB

  1. Install MariaDB server

    yum install -y MariaDB-server MariaDB-client
  2. Enable and start the service to ensure it starts when the system reboots

    systemctl enable mariadb
    systemctl start mariadb

MySQL/MariaDB common tasks and recommendations

IMPORTANT: Secure your MySQL installation before doing any more changes

/usr/bin/mysql_secure_installation

The following MySQL/MariaDB recommendations may vary depending on your system setup. In any case, Cacti will prompt you with more accurate recommendations during the installation.

  1. Edit your server.cnf file

    vim /etc/my.cnf.d/server.cnf

    The following [mysqld] section is a base configuration. The installer will provide recommendations based on the actual system which will be more tailored to your environment.

    [mysqld]
    character-set-server=utf8mb4
    collation-server=utf8mb4_unicode_ci
    innodb_file_format = Barracuda
    max_allowed_packet = 16777777
    join_buffer_size = 32M
    innodb_file_per_table = ON
    innodb_large_prefix = 1
    innodb_buffer_pool_size = 250M
    innodb_additional_mem_pool_size = 90M
    innodb_flush_log_at_trx_commit = 2
    log-error                      = /var/log/mysql/mysql-error.log
    log-queries-not-using-indexes  = 1
    slow-query-log                 = 1
    slow-query-log-file            = /var/log/mysql/mysql-slow.log
  2. Restart MySQL/MariaDB service to pick up the changes

    systemctl restart mysql
  3. Populate timezone table with available timezones

    mysql_tzinfo_to_sql /usr/share/zoneinfo | mysql -u root -p mysql

Setup Cacti database

  1. Login to MySQL/MariaDB as root to create Cacti database

    # mysql -u root -p
    MariaDB [(none)]> create database if not exists cacti;
    Query OK, 1 row affected (0.00 sec)
  2. Import Cacti database from SQL file

    MariaDB [(none)]> use cacti;
    Database changed
    MariaDB [(cacti)]> source /var/www/html/cacti/cacti.sql
  3. Grant Cacti username access to Cacti database. Replace your_cacti_username and your_cacti_password with your own details.

    MariaDB [(none)]> CREATE USER 'your_cacti_username'@'localhost' IDENTIFIED BY 'your_cacti_password';
    Query OK, 0 rows affected (0.00 sec)
    MariaDB [(none)]> GRANT ALL PRIVILEGES ON cacti.* TO 'your_cacti_username'@'localhost';
    Query OK, 0 rows affected (0.00 sec)
  4. Grant cacti username to MySQL timezone table

    MariaDB [(none)]> GRANT SELECT ON mysql.time_zone_name TO 'your_cacti_username'@'localhost';
    Query OK, 0 rows affected (0.00 sec)
    MariaDB [(none)]> FLUSH PRIVILEGES;
    Query OK, 0 rows affected (0.00 sec)

Common packages

PHP

PHP and various packages are all required by Cacti for successful operation

  1. Install PHP and required packages.

    yum install -y php php-common php-bcmath php-cli \
    php-mysqlnd php-gd php-gmp php-intl \
    php-json php-ldap php-mbstring \
    php-pdo php-pear php-snmp php-process \
    php-xml php-zip
  2. Set a timezone to your PHP.INI configuration

    Edit php.ini typically located at /etc/php.ini

    date.timezone = Pacific/Auckland

RRDtool

RRDtool is required to store the data retrieved from devices in .rra files to produce the graphs which are shown within Cacti

yum install -y rrdtool

SNMP

SNMP is used to query most devices for information.

yum install -y net-snmp net-snmp-utils

Cacti

The following steps will show you how to manually download, install and configure the basics for Cacti.

  1. Download Cacti source code from Cacti Web Site

    cd /tmp
    wget https://www.cacti.net/downloads/cacti-1.y.z.tar.gz
    tar -zxvf cacti-1.y.z.tar.gz
    mv -v cacti-1.y.z /var/www/html/cacti
  2. Edit the config.php file

    mv -v /var/www/html/cacti/include/config.php-dist /var/www/html/cacti/include/config.php
  3. Update database_ fields with your own details. This section only applies to the Main Cacti Server

     $database_type     = 'mysql';
     $database_default  = 'your_cacti_database';
     $database_hostname = 'localhost';
     $database_username = 'your_cacti_username';
     $database_password = 'your_cacti_password';
     $database_port     = '3306';
     $database_ssl      = false;
     $database_ssl_key  = '';
     $database_ssl_cert = '';
     $database_ssl_ca   = '';
  4. Create your cron task file or systemd units file

    Starting with Cacti 1.2.16, you have the option to use either the legacy Crontab entry, or an optional cactid units file and server to run your Cacti pollers.

    For Crontab use, follow the instructions below:

    Create and edit /etc/cron.d/cacti file. Make sure to setup the correct path to poller.php

    */5 * * * * apache php /var/www/html/cacti/poller.php &>/dev/null

    For systemd unit's file install, you will need to modify the included units file to following your install location and desired user and group's to run the Cacti poller as. To complete the task, follow the procedure below:

    vim /var/www/html/cacti/service/cactid.service (edit the path)
    touch /etc/sysconfig/cactid
    cp -p /var/www/html/cacti/service/cactid.service /etc/systemd/system
    systemctl enable cactid
    systemctl start cactid
    systemctl status cactid

    The systemd units file makes managing a highly available Cacti setup a bit more convenient.

Spine

  1. Install the necessary packages to compile and install spine

    yum install -y autoconf automake libtool dos2unix help2man \
    openssl-devel mariadb-devel net-snmp-devel
  2. Download spine source code from Cacti Web Site

    Go to /tmp to download the source code and extract it

    cd /tmp
    wget https://www.cacti.net/downloads/spine/cacti-spine-1.y.z.tar.gz
    tar -zxvf cacti-spine-1.y.z.tar.gz
    cd cacti-spine-1.y.z
  3. Run the configure script and compile spine.

    # ./configure
    # make &  make install
    config/install-sh -c -d '/usr/local/spine/bin'
    /bin/sh ./libtool   --mode=install /usr/bin/install -c spine '/usr/local/spine/bin'
    libtool: install: /usr/bin/install -c spine /usr/local/spine/bin/spine
    config/install-sh -c -d '/usr/local/spine/etc'
    /usr/bin/install -c -m 644 spine.conf.dist '/usr/local/spine/etc'
    config/install-sh -c -d '/usr/local/spine/share/man/man1'
    /usr/bin/install -c -m 644 spine.1 '/usr/local/spine/share/man/man1'
  4. Edit spine.conf

    Rename spine.conf.dist to spine.conf

    mv -v /usr/local/spine/etc/spine.conf.dist /usr/local/spine/etc/spine.conf
    vi /usr/local/spine/etc/spine.conf
  5. Now set up your database connection

    DB_Host       localhost
    DB_Database   your_cacti_database
    DB_User       your_cacti_username
    DB_Pass       your_cacti_password
    DB_Port       3306
    #DB_UseSSL    0
    #RDB_SSL_Key
    #RDB_SSL_Cert
    #RDB_SSL_CA

Security Enhanced Linux (SELinux)

If you are having issues to access the web page, disable SELinux temporarily to prove that the issues come from the SELinux policy. It is NOT recommended to disable SELinux permanently.

CentOS has a lot of documentation on how to make your SELinux policy right.

  1. Check SELinux status

    getenforce
  2. Disable SELinux temporarily

    setenforce 0
  3. Enable SELinux back

    setenforce 1

Note: If you installed Cacti out of /var/www/html make sure you fix up all SELinux context and permissions.


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