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Linux: Find Out Apache User Name
In most Linux distributions, the Apache HTTP server runs as a separate user and group for security reasons. By default, the user and group name used by Apache is www-data . To find out the user and group name used by Apache on your Linux system, you can use the following command:rn rn rn ps -ef |
FreeBSD: IPv6 Configuration Set Prefixlen Value
To configure IPv6 address with a specific prefix length value on FreeBSD, you can use the ifconfig command with the prefixlen option. The prefixlen option sets the number of bits in the IPv6 address prefix. Here's an example command to configure an IPv6 address with a prefix length of 64 on FreeBSD:
Ubuntu Linux View Boot Log Command
To view the boot log on Ubuntu Linux, you can use the dmesg command. The dmesg command is a command-line utility that prints the kernel ring buffer messages, which includes the boot log messages. Here's how you can view the boot log on Ubuntu Linux:rn rn Open a terminal: To open a terminal on Ubuntu
Linux Configure Sendmail as SMTP Mail Client ( submission MTA )
Sendmail can be configured as an SMTP mail client, also known as a submission MTA (Mail Transfer Agent), on Linux systems. Here are the general steps to set up Sendmail as an SMTP mail client on Linux: n n Install Sendmail: Sendmail is usually available in the default repositories of most Linux dist
Shell Scripting: If Variable Is Not Defined, Set Default Variable
To check if a variable is defined in a shell script, you can use the if statement. Here, -z tests if the length of the variable $VAR is zero or not. If the variable is not defined or has a length of zero, the statement will be true. To set a default variable value in case the variable is not defi
How To Find IP Address Owner
To find the owner of an IP address, you can follow these steps:rn rn Determine the IP address you want to look up. You can find this information in various ways, such as checking the log files of your website or network, or by using an IP address lookup tool. rn Visit a website that offers IP addres
HowTo: Mediawiki Reset a User Password
If you need to reset a user password in MediaWiki, you can do so by following these steps:rn rn Log in to your MediaWiki website with an administrative account. rn Navigate to the user's profile by searching for their name in the search bar or by clicking on their name if it's visible on a page. rn
Centos Install and Configure MRTG
MRTG (Multi Router Traffic Grapher) is a tool that can monitor and graph the traffic load on network links. Here are the steps to install and configure MRTG on CentOS:rn rn Install the required packages: rn rn rn rn sudo yum install mrtg httpd httpd-tools net-snmp net-snmp-utilsrn rn rn rn Create th
Iptables Open VNC Port To Allow Incoming VNC Connections
To allow incoming VNC connections on a Linux system using iptables firewall, you can follow these steps:rn rn Check if iptables is already installed and running: rn rn rn rn sudo systemctl status iptablesrn rn rnIf it's not running, start it with the following command:rn rn rn sudo systemctl start i
Snmpd Listen to Specific IP Address ( BIND To Selected Interfaces )
By default, snmpd listens on all available network interfaces. However, you can configure it to listen only on specific IP addresses or network interfaces. Here's how to do it:rn rn Edit the snmpd configuration file, usually located at /etc/snmp/snmpd.conf , using your favorite text editor. rn Find
How To Setup OpenVZ under RHEL / CentOS Linux
OpenVZ is a container-based virtualization solution that allows you to create and manage multiple virtual environments on a single physical server. Here are the steps to set up OpenVZ under RHEL / CentOS Linux:rn rn Install the OpenVZ kernel and tools: rn rn rn rn # yum install vzkernel vzctl vzquot
Is Open Source Software Legal To Use For My Business?
Yes, open source software is legal to use for your business. In fact, many businesses and organizations use open source software as a cost-effective alternative to proprietary software. Open source software is generally distributed under a license that allows users to use, modify, and distribute the
BSD PF Firewall Block FTP Bruteforce Attacks
To block FTP bruteforce attacks using the PF firewall on a BSD system, you can create a rule that limits the number of FTP connections from a single IP address within a certain period of time. Here's an example rule that blocks FTP bruteforce attacks:rn rn rn pass in on $ext_if proto tcp from any to
UNIX Get An Alert When Disk Is Full
To get an alert when a disk is full on a UNIX system, you can set up a disk space monitoring script that periodically checks the disk usage and sends an email alert when the disk usage exceeds a certain threshold. Here's an example script that you can modify to suit your needs:rn rn rn #!/bin/bash r
Adobe Photoshop Alternatives For Linux Desktop
While Adobe Photoshop is not natively available for Linux, there are several open-source and commercial alternatives that you can use for image editing and manipulation on Linux desktop. Here are some popular options: n n GIMP – GNU Image Manipulation Program – a free and open-source ima
How To Use awk In Bash Scripting
awk is a powerful text processing tool that can be used in Bash scripting to perform various tasks, such as extracting and manipulating data from text files. Here are some basic steps to use awk in Bash scripting:rn rn Create a Bash script file with a shebang at the beginning to specify the interpre
Samba: Allow Domain Controllers Create Machine Trust Accounts On-the-Fly
By default, Samba does not allow domain controllers to create machine trust accounts on-the-fly. However, you can configure Samba to allow domain controllers to create machine trust accounts on-the-fly by following these steps:rn rn Edit the Samba configuration file smb.conf : rn rn rn rn sudo nano
Linux Disable / Remove All NFS Services
To disable or remove all NFS (Network File System) services on a Linux machine, you can follow these steps:rn rn Check if NFS services are currently running: rn rn rn rn sudo systemctl status nfs-serverrnsudo systemctl status nfs-lockrnsudo systemctl status nfs-idmaprn rn rn rn Stop and disable the
Linux Iptables Open LDAP Server TCP Ports 389 and 636
To allow TCP traffic on ports 389 and 636 for an OpenLDAP server on a Linux machine using iptables, you can use the following commands: n n Allow TCP traffic on port 389: n n n n sudo iptables - A INPUT - p tcp --dport 389 -j ACCEPT n n n n Allow TCP traffic on port 636: n n n n sudo iptables - A IN
DenyHosts: Remove / Delete an IP address
If you need to remove or delete an IP address from the DenyHosts blacklist, you can follow these steps:rn rn Log in to your server as root. rn Open the DenyHosts configuration file using a text editor: rn rn rn rn vi /etc/hosts.denyrn rn rn rn Locate the line that contains the IP address you want to
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