Linux Make Sure /etc/resolv.conf Never Get Updated By DHCP Client
The DHCP protocol allows a host to contact a central server which maintains a list of IP addresses which one can assign to one or more subnets. This protocol reduces system administration workload, allowing devices to be added to the network with little or no manual configuration. WARNING! Many firewalls only allow access to specific nameservers only. So make sure your nameservers are supported. A
Ubuntu Linux OpenSSH Server installation and configuration
nixCraft → Howto → Debian Linux → Ubuntu Linux OpenSSH Server installation and configuration Q. I have just installed Ubuntu 6.06 and I would like to allow remote login to my system from home via ssh. How do I install and configure SSH server? A. OpenSSH is a FREE version of the SSH connectivity tools that technical users of the Internet rely on. Users of telnet, rlogin, and ftp may not realize th
How to use yum command on CentOS/RHEL - nixCraft
How do I use the yum command to update and patch my Red hat Enterprise Linux / CentOS Linux version 5.x/6.x/7.x server via RHN or the Internet? Can I use up2date command under a RHEL v5.x? up2date command was part of RHEL v4.x or older version. You need to use yum command to update and patch the system using RHN or Internet. Use yum command to install critical and non-critical security updates as
Linux Add User To Group Using Command-Line - nixCraft
How to add user to group in Linux Please note that all user accounts related information are stored in the following files: /etc/passwd – Contains one line for each user account. /etc/shadow – Contains the password information in encrypted formatfor the system’s accounts and optional account aging information. /etc/group – Defines the groups on the system. /etc/default/useradd – This file contains
Top 20 OpenSSH Server Best Security Practices
OpenSSH is the implementation of the SSH protocol. OpenSSH is recommended for remote login, making backups, remote file transfer via scp or sftp, and much more. SSH is perfect to keep confidentiality and integrity for data exchanged between two networks and systems. However, the main advantage is server authentication, through the use of public key cryptography. From time to time there are rumors
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