Stack installation on CentOS 5

Owned by Former user (Deleted)
Last updated: Sept 24, 2009Version comment
3 min read

All commands are run as root.

Text editor (mostly for my use):

yum install nano

EPEL and Remi repositories

  • Install the repositories 
    rpm -Uvh http://download.fedora.redhat.com/pub/epel/5/x86_64/epel-release-5-2.noarch.rpm
rpm -Uvh http://rpms.famillecollet.com/el5.x86_64/remi-release-5-4.el5.remi.noarch.rpm
  • Edit /etc/yum.repos.d/remi.repo.
    • Under [TECH:remi], set enabled=1.

PHP and MySQL(i) client

  • Configure base packages 
    yum install php-pear php-mysql php-mbstring
/etc/init.d/httpd restart
  • Test
    • Configure phpinfo() page 
      echo "<?php phpinfo();" > /var/www/html/index.php
chmod 644 /var/www/html/index.php
    • Load page in browser

APC

yum install php-pecl-apc
/etc/init.d/httpd restart
  • Test: Load page in browser and look for "apc.stat"

Memcached

yum install zlib-devel memcached php-pecl-memcache
/etc/init.d/memcached start
Test:  telnet localhost 11211
/etc/init.d/httpd restart
  • Test: Load page in browser and look for "memcache.default_port"

Apache

  • Change "AllowOverride None" to "AllowOverride All" for <Directory "/var/www/html">:
    /etc/httpd/conf/httpd.conf (excerpt)
    <Directory "/var/www/html">

    [...]

    AllowOverride All

    [...]

</Directory>

MySQL server

  • Install MySQL 
    yum install mysql-server
  • Set better defaults in /etc/my.cnf under [TECH:mysqld]: 
    default_storage_engine = InnoDB
default_character_set = utf8
collation_server = utf8_general_ci
character_set_server = utf8
  • Start MySQL and set the root password: 
    /etc/init.d/mysqld start
/usr/bin/mysqladmin -u root password 'new-password'
/usr/bin/mysqladmin -u root -h localhost.localdomain password 'new-password'

Synchronize system clock

yum install ntp
chkconfig ntpd on
ntpdate pool.ntp.org
/etc/init.d/ntpd start

phpMyAdmin

  • Install phpMyAdmin 
    yum install phpmyadmin
  • Edit /etc/httpd/conf.d/phpMyAdmin.conf to allow access from non-localhost clients.
  • Edit /etc/phpMyAdmin/config.inc.php to add additional servers and use the "mysqli" driver for connections.
  • Restart Apache: 
    /etc/init.d/httpd restart
  • Visit http://server.example.com/phpmyadmin
  • Log in using "root" and the root password set from the MySQL server installation.

Nagios (only for monitoring server)

  • Install Nagios 
    yum install nagios nagios-plugins-disk nagios-plugins-dns nagios-plugins-http nagios-plugins-load \
 nagios-plugins-mysql nagios-plugins-ping nagios-plugins-ssh nagios-plugins-users nagios-plugins-procs \
 nagios-plugins-nrpe nagios-plugins-swap
htpasswd -c /etc/nagios/passwd nagios
chgrp apache /etc/nagios/passwd
chmod 640 /etc/nagios/passwd
  • Edit /etc/httpd/conf.d/nagios.conf.
    • Change allow from 127.0.0.1 to allow from all.
  • Edit /etc/nagios/nagios.cfg.
    • Uncomment cfg_dir=/etc/nagios/servers.
  • mkdir /etc/nagios/servers && chgrp nagios /etc/nagios/servers && chmod g+s /etc/nagios/servers.
  • Edit /etc/nagios/localhost.cfg to change nagios-admin to nagios.
  • Add the following text to /etc/nagios/commands.cfg to support querying NRPE on remote hosts: 
    define command{ 
        command_name    check_nrpe 
        command_line    $USER1$/check_nrpe -H $HOSTADDRESS$ -c $ARG1$ 
        }
  • Verify configurations: 
    nagios -v /etc/nagios/nagios.cfg
  • Add server configurations to /etc/nagios/servers.
  • Restart Apache and Nagios: 
    /etc/init.d/httpd restart
/etc/init.d/nagios restart

Nagios clients

  • Install NRPE plugin: 
    yum install nrpe nagios-plugins-disk nagios-plugins-load nagios-plugins-ping \
 nagios-plugins-ssh nagios-plugins-users nagios-plugins-procs nagios-plugins-swap
  • Edit /etc/nagios/nrpe.cfg.
    • Add the Nagios server to allowed_hosts.
    • Add necessary commands to the command definitions section.
  • Start the service: 
    /etc/init.d/nrpe start
  • Make the service start by default: 
    chkconfig nrpe on
  • Verify access to NRPE from the Nagios server: 
    /usr/lib64/nagios/plugins/check_nrpe -H [nrpe-remote-host]
  • Verify access to commands from the Nagios server: 
    /usr/lib64/nagios/plugins/check_nrpe -H [nrpe-remote-host] -c [command]

Nagios Apache clients

  • Install relevant plugin(s): 
    yum install nagios-plugins-http
  • Add a check_http command to /etc/nagios/nrpe.cfg: 
    command[check_http]=/usr/lib64/nagios/plugins/check_http -w 5 -c 20 -I 127.0.0.1

Nagios MySQL clients

  • Install relevant plugin(s): 
    yum install nagios-plugins-mysql
  • Log into MySQL and add an unprivileged nrpe user: 
    CREATE USER 'nrpe'@'localhost' IDENTIFIED BY 'nrpe';
GRANT REPLICATION CLIENT ON *.* TO 'nrpe'@'localhost';
  • Add a check_mysql command to /etc/nagios/nrpe.cfg for a non-slave server: 
    command[check_mysql]=/usr/lib64/nagios/plugins/check_mysql -u nrpe -p nrpe
  • Add a check_mysql command to /etc/nagios/nrpe.cfg for a slave server: 
    command[check_mysql]=/usr/lib64/nagios/plugins/check_mysql -u nrpe -p nrpe -S -w 2 -c 10

Cacti (only for monitoring server)

  • Install the main package 
    yum install php-snmp net-snmp net-snmp-utils cacti
  • Edit /etc/cacti/db.php: 
    $database_type = 'mysql';
$database_default = 'cacti';
$database_hostname = 'localhost';
$database_username = 'cacti';
$database_password = 'password-here';
$database_port = '3306';
  • Install the database: 
    mysql -p cacti < /usr/share/doc/cacti-0.8.7b/cacti.sql
mysql_convert_table_format --password="mysql-root-password" --type="InnoDB" cacti
  • Edit /etc/httpd/conf.d/cacti.conf to allow access from non-localhost.
  • Restart Apache: 
    /etc/init.d/httpd restart
  • Enable cron operation by adding the line */5 * * * * /usr/bin/php /usr/share/cacti/poller.php > /dev/null 2>&1 to cacti's crontab: 
    export EDITOR=nano
crontab -u cacti -e
  • Grant Apache access to the RRD files: 
    chgrp -R apache /var/lib/cacti/rra
chmode -R g+s /var/lib/cacti/rra
  • Go to http://server.example.com/cacti and log in as admin/admin.

Cacti clients

  • Install the SNMP daemon: 
    yum install net-snmp net-snmp-libs net-snmp-utils
  • If the /etc/snmp/snmpd.conf is the default, move it: 
    mv /etc/snmp/snmpd.conf /etc/snmp/snmpd.conf.original
# snmpconf -i -g basic_setup
  • Configure the SNMP daemon by putting the following in /etc/snmp/snmpd.conf: 
    rocommunity public cacti-server-ip
rocommunity public 127.0.0.1
dontPrintUnits true
includeAllDisks
  • Enable the SNMP daemon: 
    /etc/init.d/snmpd start
chkconfig snmpd on
  • Add the device to the Cacti server
    • Console > Management > Devices > Add
      • Description: enter-name
      • Hostname: ip-address
      • Host Template: Generic SNMP-enabled Host
      • SNMP Version: Version 1
    • Console > Management > Graph Trees > Default Tree > Add
      • Tree Item Type: Host
      • Host: select-host

Cacti Apache clients

  • Add the following to /etc/snmp/snmpd.conf: 
    proc httpd

Cacti MySQL clients

To be written.

Load testing with curl-loader

  • Download, build, and install: 
    yum install gcc openssl-devel
wget http://downloads.sourceforge.net/curl-loader/curl-loader-0.46.tar.gz
tar xzf curl-loader-0.46.tar.gz
rm curl-loader-0.46.tar.gz
cd curl-loader-0.46
make
make install
  • Run: 
    curl-loader -f configfile

PHP PECL xdebug

  • Install xdebug and restart Apache 
    pear install pecl/xdebug
/etc/init.d/httpd restart
  • To profile code
    • Add the following to /etc/php.d/xdebug.conf: 
      zend_extension=/usr/lib64/php/modules/xdebug.so
xdebug.profiler_enable_trigger = 1
    • Restart Apache: 
      /etc/init.d/httpd restart
    • And then load the page you want to profile with "?XDEBUG_PROFILE=1" at the end of the URL.

To do

  • Set up multiple memcached instances (instead of the default single instance)
  • Tune APC