An interesting incident happened on the server after a global update CentOS 7.1.1503 to version 7.2.1511. Usually when you upgrade CentOS anything happened with SELinux. Somewhere something changed contexts somewhere else something. But in this case, after you upgrade CentOS, daemon logging syslog-ng stopped writing logs. Not all logs, and most of that was getting through syslog.
As it turned out, the system logging ceased publishing send copies of logs to syslog. But the fix is quite easy, to do this, run the following commands:

$ nano -w /etc/systemd/journald.conf
[Journal]
ForwardToSyslog=yes
$ systemctl restart systemd-journald.service
$ systemctl restart syslog-ng.service

Installing RoundCube webmail

First of all install the RoundCube and driver for MySQL:

$ yum -y install php-pear-MDB2-Driver-mysqli roundcubemail

Now SELinux allow network connections to the Web server:

$ setsebool -P httpd_can_network_connect=on

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Installing DSpam

First install the required packages:

$ yum -y install dspam dspam-mysql dspam-web

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It is assumed that you have already installed and configured Apache, PHP/MySQL and MariaDB. Instructions for setting up can be read at this link.
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LAMP is an acronym denoting the set of (complex) server software, widely used in the World Wide Web. LAMP is named after the first letters of its constituent components:

• Linux is the Linux operating system;
• Apache is a Web server;
• Mariadb/MySQL is a database management system;
• PHP is a programming language used to create Web applications (other than PHP can mean other languages such as Perl and Python).

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OpenVPN is a free implementation of the technology of virtual private network (VPN) with open source software to create encrypted channels, point-to-point or server-to-client between computers. It allows you to establish connections between computers behind a NAT firewall, without having to change their settings.
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Bind (Berkeley Internet Name Daemon) is also known as the default – this is the best known and most used DNS server on the Internet. I will try to describe how to install and configure the service in the chrooted environment (chroot operation changes the root directory in Unix-like operating systems. program started with altered root directory will only have access to the files contained in this directory, so if you want to allow the program to access other directories or file systems (for example, /proc), it is necessary to mount the necessary directories in the target directory or device.).
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For a number of reasons, rsyslog is installed in the default CentOS, I do not like. I love when the logs are sorted by year, month, facility, priorities. So the first thing I change rsyslog in syslog-ng. To do this, do the following:
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