Since I am a real master at forgiving things I am writing this one down. PHP mail function relies on sendmail but SELinux by default block webservers from sending emails, the usual error that pop-out is: cat /var/log/maillog"> --- sendmail[16328]: NOQUEUE: SYSERR(nginx): /etc/mail/sendmail.cf: line 0: cannot open: Permission denied Allow webservers to send email is as easy as editing the appropriate SELinux boolean: setsebool -P httpd_can_sendmail 1 Use sestatus to check SELinux booleans: …

Zabbix is an open source resource and network monitoring system, more info: zabbix.com. The official wiki is missing some important bits regarding the installation of the tool on CentOS 7 systems. First of all, let’s add Zabbix repository and then proceed to with the installation of Zabbix and some required dependecies: $ rpm -ivh http://repo.zabbix.com/zabbix/3.4/rhel/7/x86_64/zabbix-release-3.4-1.el7.centos.noarch.rpm $ yum install mariadb mariadb-server httpd zabbix-server-mysql zabbix-web-mysql setroubleshoot Configure MariaDB Login to MariaDB shell, change root’s password, create a new database for Zabbix and add a new user: …

With Samba being the clusterfuck it is, every time a new version is released you have to expect something to be messed up. This time they added a bunch of new features like MS Active Directory support, too bad that now the simple directory sharing is broken/not working like it did before. Something like 1 year ago I wrote a small guide about how to setup a Samba share on Centos 6 and I used the same smb. …