Initially ensure that you are logged into the root user for performing following operations

Update the System
#yum update
After the update completed, we need to restart the system using the following command :
#reboot
Install the dependency packages.
These are the basic software packages for environment settings and utility tools to compile other packages in the next section.
#yum -y install zip unzip git libyaml-devel zlib-devel curl-devel openssl-devel httpd-devel apr-devel apr-util-devel mysql-devel gcc ruby-devel gcc-c++ make postgresql-devel ImageMagick-devel sqlite-devel perl-LDAP moda_perl perl-Digest-SHA

Install Apache and MySQL
Use the following command to install:
#yum -y install httpd mysql mysql-server
Allow start services when OS boot :
chkconfig httpd on
chkconfig mysqld on
service httpd start
service mysqld start

Set the password for MySQL
/usr/bin/mysql_secure_installation
Because we not have a password for the root account so you press Enter to skip.
Enter current password for root (enter for none):
Select Yes to set the password for the MySQL root account.
Set root password? [Y/n] y
Enter and confirm your password, remove the anonymous user, select Yes
Remove anonymous users? [Y/n] y
Allow remote login to MySQL as root account, select No.
Disallow root login remotely? [Y/n] n
Delete the test database, select Yes
Remove test database and access to it? [Y/n] y
Reload privilege tables, select Yes
Reload privilege tables now? [Y/n] y
Turn off SELinux
SELinux is a security feature advanced for Linux operating system, when installing the system you need to turn off this feature to get the process done smoothly, after successful you can turn on back if you want.
vim /etc/selinux/config
Change the file content :
SELINUX=disabled
Set up the Hostname
By default when installing a new OS Centos not set the hostname, so we need to setting with the command :
vim /etc/hosts
Add your domain name or host name that you set on both the command line, save the file and exit, the server name will be changed when restarting.
Configuring the Firewall
We do not want to turn off the firewall because it’s quite important, so you need to add rules to allow port 80 for HTTP and port 443 for HTTPS.
In the Centos OS, you can configuration firewall by editing files iptables and ip6tables.
vim /etc/sysconfig/iptables
Press Enter to create a new line after the line of port 22, copy the following two commands and right click on the window to the Paste command.
-A INPUT -m state –state NEW -m tcp -p tcp –dport 80 -j ACCEPT
-A INPUT -m state –state NEW -m tcp -p tcp –dport 443 -j ACCEPT
Press CTRL + O to save the file and press CTRL + X to exit.
The same applies for IP6 firewall :
vim /etc/sysconfig/ip6tables
Add these lines to the file.
-A INPUT -m state –state NEW -m tcp -p tcp –dport 80 -j ACCEPT
-A INPUT -m state –state NEW -m tcp -p tcp –dport 443 -j ACCEPT
After you finish editing both files, run the commands to apply the new rules for firewall.
/etc/init.d/iptables restart
/etc/init.d/ip6tables restart
Allow turn on the firewall when reboot the operating system.
chkconfig iptables on
chkconfig ip6tables on
Finally, we need to restart the system to apply the changes to the SELinux and Hostname.
reboot
Install PHP and phpMyAdmin
Because we use MySQL database management system, so we need to install phpMyAdmin program management.
phpMyAdmin is a free open source tool written by PHP language to manage MySQL database via a web browser.
It can create, modify or delete databases, tables, fields or records, perform SQL statements, or managing users and permissions.
The command to install PHP and the packages :
yum -y install php php-mysql php-gd php-imap php-ldap php-mbstring php-odbc php-pear php-xml php-xmlrpc php-pecl-apc php-soap
Restarting the Apache service :
service httpd restart
And install phpMyadmin :
rpm –import http://dag.wieers.com/rpm/packages/RPM-GPG-KEY.dag.txt
yum install http://pkgs.repoforge.org/rpmforge-release/rpmforge-release-0.5.3-1.el6.rf.x86_64.rpm
yum -y install phpmyadmin
Editing the virtual host file to allow remote login to the phpMyadmin.
vim /etc/httpd/conf.d/phpmyadmin.conf
Replace text “Allow from 127.0.0.1” to “Allow from all”, save the file and exit.
Editing the configuration file for the phpMyadmin
vim /usr/share/phpmyadmin/config.inc.php
Replace text :
$cfg[‘Servers’][$i][‘auth_type’] = ‘cookie’;
To :
$cfg[‘Servers’][$i][‘auth_type’] = ‘http’;
Save the file and exit, restarting the Apache service :
service httpd restart
After successfully installed phpMyadmin, you can check at the address :
http://your-domain/phpmyadmin
Login with account : root / your_password
With Password has been set at step install MySQL database in the above.
Note: If you install the Redmine system on the PC or in a virtual machine which not on the dedicated server, we need to switch the application phpMyadmin to run on port 8080 because port 80 will be used for Redmine in the next steps.
We need add a port 8080 to the firewall and change the VirtualHost for phpMyadmin.
vim /etc/sysconfig/iptables
Add the command line :
-A INPUT -m state –state NEW -m tcp -p tcp –dport 8080 -j ACCEPT
The same applies for IP6 firewall :
vim /etc/sysconfig/ip6tables
Add the command line :
-A INPUT -m state –state NEW -m tcp -p tcp –dport 8080 -j ACCEPT
Restarting firewall service to allow the new port.
/etc/init.d/iptables restart
/etc/init.d/ip6tables restart
Editing the VirtualHost file to run phpMyadmin on the port 8080
vim /etc/httpd/conf/httpd.conf
Change the file content :
<VirtualHost *:8080>
DocumentRoot /usr/share/phpmyadmin/
ServerName your_domain.com
</VirtualHost>
Next, add the command to allows listening on the port 8080 in the file “httpd.conf”
vim /etc/httpd/conf/httpd.conf
Add the command line :
Listen 8080
Save the file and exit, restarting the Apache service :
service httpd restart
Now, phpMyadmin will run on the port 8080 at the address :
http://your-domain:8080
Install Ruby
Ruby is a object-oriented programming language, capable of reflection. Syntax inherited from Ada and Perl with object-oriented features of Smalltalk, and also share some features with Python, Lisp, Dylan and CLU, Ruby is a single phase interpreter.
Ruby provides programming patterns, including functional programming, object-oriented, imperative, reflective, it uses dynamic variable and automatic memory management.
Install Ruby interpreter with version management program RVM.
\curl -L https://get.rvm.io | bash
After successful, we will launch RVM
source /etc/profile.d/rvm.sh
The following command will list the versions of Ruby to install :
rvm list known
We choose the stable version [ruby-] 1.9.3 [-p545], and execute the following command :
rvm install 1.9.3
The installation process is pretty long time, but you do not need any intervention, after successful, you check with the following command :
ruby -v

Install Rubygems
Rubygems is a Ruby’s packages management program, very popular in applications written by Ruby language and the Ruby On Rails framework.
yum -y install rubygems
Install Passenger
The full name of the Passenger is Phusion Passenger, known as mod_rails or mod_rack, it is a web application intergrate with Apache and it can operate as a standalone web server support for the Ruby On Rails applications.
Execute the following commands :
gem install passenger
passenger-install-apache2-module
After completed, we copy a notification block in the window to create the configuration file in the next steps (select block notification and press C to copy).
LoadModule passenger_module /usr/local/rvm/gems/ruby-1.9.3-p545/gems/passenger-4.0.37/buildout/apache2/mod_passenger.so
<IfModule mod_passenger.c>
PassengerRoot /usr/local/rvm/gems/ruby-1.9.3-p545/gems/passenger-4.0.37
PassengerDefaultRuby /usr/local/rvm/gems/ruby-1.9.3-p545/wrappers/ruby
</IfModule>
Create a new virtual host file for Passenger :
vim /etc/httpd/conf.d/passenger.conf
Paste the command blocks into the empty file and save it, then restart the Apache service.
service httpd restart

Create Database for Redmine
Use MySQLAdmin to create an empty database for Redmine, saved password to fill in the configuration file in the next steps.
mysql –user=root –password=root_password_mysql
create database redmine_db character set utf8;
create user ‘redmine_admin’@’localhost’ identified by ‘your_new_password’;
grant all privileges on redmine_db.* to ‘redmine_admin’@’localhost’;
quit;
Install Redmine
Redmine is a main program of the project management system, we will download and install the program from the website of Redmine.
Download Redmine version 2.5.x to directory “/var/www” on the Centos OS.
cd /var/www
wget http://www.redmine.org/releases/redmine-2.5.0.tar.gz
Extract the folder and rename directory
tar xvfz redmine-2.5.0.tar.gz
mv redmine-2.5.0 redmine
rm -rf redmine-2.5.0.tar.gz
Configuring the Database
The next, we need to configure the database was created from the above steps.
cd /var/www/redmine/config
cp database.yml.example database.yml
vim database.yml

Setting up Rails
Install the package library support for Rails using the Bundle.
cd /var/www/redmine
gem install bundler
bundle install
rake generate_secret_token
The next, we create the database table for the Redmine application.
RAILS_ENV=production rake db:migrate
RAILS_ENV=production rake redmine:load_default_data
Activate FCGI
cd /var/www/redmine/public
mkdir plugin_assets
cp dispatch.fcgi.example dispatch.fcgi
cp htaccess.fcgi.example .htaccess
Setting up Apache and FastCGI
cd /var/www/
rpm –import https://fedoraproject.org/static/0608B895.txt
wget http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
rpm -ivh epel-release-6-8.noarch.rpm
yum -y install mod_fcgid
rm -rf epel-release-6-8.noarch.rpm
Creating Files Directory
This directory contains data files generated during the operation of Redmine as document or image file, we create a new directory in the “/opt”.
mkdir -p /opt/redmine/files
chown -R apache:apache /opt/redmine
cd /var/www/redmine/config
cp configuration.yml.example configuration.yml
vim configuration.yml
Enter the directory path containing the data files you just created in the previous step into the line “attachments_storage_path”.
Note: You must add a space at the begin of the path “/opt/redmine/files” after character “:”
Configuring Email
Another very important function of Redmine is using email to notify members when the contents of each project changes, Redmine can use many different methods to send email that is Sendmail, SMTP, GMail …
To configure the email we will edit the configuration file.
vim/var/www/redmine/config/configuration.yml
If you use GMail’s SMTP, you need to register an email account with the login methods used password normal and disable two-step authentication by smart phone.
Enter your Gmail account as below :
email_delivery:
delivery_method: :smtp
smtp_settings:
enable_starttls_auto: true
address: “smtp.gmail.com”
port: 587
domain: “smtp.gmail.com”
authentication: :plain
user_name: “your_email@gmail.com”
password: “your_password”
Save the file configuration and exit.
Create Virtual Host for Redmine
Create an Apache configuration file for the Redmine application at the port 80.
vim /etc/httpd/conf.d/redmine.conf
Copy the text below and paste into the editor window, note the information to change your domain name.
<VirtualHost *:80>
ServerName your_domain
ServerAdmin your_domain@domain.com
DocumentRoot /var/www/redmine/public/
ErrorLog logs/redmine_error_log
<Directory “/var/www/redmine/public/”>
Options Indexes ExecCaGI FollowSymLinks
Order allow,deny
Allow from all
AllowOverride all
</Directory>
</VirtualHost>
Save the file configuration and exit.

Running Redmine
Before execute Redmine in the first time, we must permission for the directory installed Redmine and restart Apache service.
cd /var/www
chown -R apache:apache redmine
chmod -R 755 redmine
service httpd restart
Redmine will run at the following address URL :
http://your-domain
Login to system with an administrator account : admin / admin
You can change your password after successful login.
We can see Redmine has running but very primitive, in the next steps we will install the support plugins and customized Redmine to use professional.

Install redmine_email_fetcher plugin
Link:- https://github.com/luismaia/redmine_email_fetcher

cd /var/www/redmine/plugin/

git clone git://github.com/luismaia/redmine_email_fetcher.git

bundle install

rake redmine:plugins:migrate RAILS_ENV=production

rake -T redmine:plugins:email_fetcher RAILS_ENV=production
Reference:-
http://www.redmine.org/projects/redmine/wiki/install_Redmine_25x_on_Centos_65_complete

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