RPM stands for Red Hat Packet Manager. It is a package management system in all Red Hat based Operating System (RHEL/CentOS/Scientific Linux). In RPM known file format .rpm is used. rpm.org community is involve in maintenance and development of RPM.
How to Use chown in Linux
Use the chown command to change file owner and group information. Use the chmod command to change file access permissions such as read, write, and access.
How to Force fsck on Reboot
The system utility fsck (for “file system check”) is a tool for checking the consistency of a file system in Unix and Unix-like operating systems.
Disable Recursion on Bind DNS Server
Log into SSH on your dedicated or cloud server.
# vi named.conf
Make sure following settings exists under Options { … } settings:
Finding Log Files on CentOS
All major system log files are located in the /var/log directory in Centos Linux. Below is a list of the standard log files that are located on a clean Centos install along with a short description.
How to Limit the IP Address that sshd Listens
Log into SSH on your dedicated or cloud server.
You can edit the sshd_config file located in /etc/ssh/.
# vi /etc/ssh/sshd_config
High Memory Usage on a Dedicated or Cloud Server
The common philosophy with respect to system memory is that unused memory is wasted. Most operating systems, including both Windows and Linux maintain what’s called a memory “cache.” Technically this memory space is in use, however it is designed to be freed immediately if applications actually need the memory.
Installing ClamAV on CentOS / Red Hat Servers
ClamAV is an open source (GPL) antivirus engine designed for detecting Trojans, viruses, malware and other malicious threats. It is the de facto standard for mail gateway scanning. It provides a high performance mutli-threaded scanning daemon, command line utilities for on demand file
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Install Auditd Reports on CentOS / Red Hat
Auditd Report is typically installed with most Centos.
Auditd can look at logs to see what system files like /etc/passwd got modified log whom logged in.
How to Install ChkRootKit on Linux Server
chkrootkit is a collection of tools to detect the presence of rootkits. chkrootkit uses C and shell scripts to perform a detailed process check, and scans systems binaries to detect kit signatures. Upon detection, in most cases, it can remove rootkits too.
