CentOS Firewalld. How To CentOS firewalld provides a dynamically managed firewall with support for network/firewall zones to define the trust level of network connections or interfaces. It has support for IPv4, IPv6 firewall settings and for ethernet bridges and has… Continue Reading
Zimbra Fail2ban Setup How to install and configure Fail2ban for Zimbra mail server on CentOS. Fail2Ban is an intrusion prevention software framework that protects computer servers from brute-force attacks. Install Fail2ban on CentOS 7: Ensure your system is up… Continue Reading
How to install Phoronix test suite on CentOS The Phoronix Test Suite is Open-Source Automated testing and benchmarking platform. The Phoronix Test Suite has access to more than 450 test profiles and over 100 test suites via OpenBenchmarking.org. First install… Continue Reading
How To Install and Configure Zabbix Agent on Linux – Red Hat Enterprise Linux / CentOS and Debian / Ubuntu Zabbix server requires to install Zabbix Agent on remote Windows and Linux systems. For collecting information and and provide to… Continue Reading
Zimbra Mail Server is sending Spam How to find SMTP Auth usernames (users) who authenticated on the SMTP port to send a bulk emails. The following command will return list of authenticated users on the SMTP port to send an… Continue Reading
How do I scan for viruses with ClamAV? At first you have to update the virus definitions with: sudo freshclam Then you can scan for viruses. clamscan OPTIONS File/Folder If necessary start with root permissions: sudo clamscan. Examples: To check… Continue Reading
How To Monitor Disk Load in Linux iostat utility will help measure and monitor hard drive load: # iostat -dx /dev/sda 5 As result you can see output:
How To Create a Sudo User CentOS Login into your server as root. If you already have user you can use usermod command ro add the user to the wheel group: # usermod -aG wheel username For testing sudo for that… Continue Reading
How To Check Disk Speed in Linux From Terminal You can check Linux disk (HDD or SSD) I/O performance with hdparm command. hdparm -Tt /dev/sda will measure show buffered and cached disk read speed. sudo hdparm -Tt /dev/sda Example output:… Continue Reading
Htop is a one of the best an alternative tool for Linux top command. Install Epel Release on CentOS 7: # yum -y install epel-release Install htop with yum command: # yum -y install htop