SELinux related tutorial/FAQ

What Is SELinux?

last updated December 6, 2012 in SELinux

What is SELinux? Why should I use SELInux on my CentOS or Red Hat Enterprise Linux server running on IBM hardware?

seinfo Command: Query SELinux Policy Under CentOS / RHEL / Linux

last updated December 1, 2012 in SELinux

How do I query and get information about a policy under SELinux? How do I analyze a binary or a source policy file under SELinux?

tar and rsync: Archive and Preserve SELinux Contexts, Extended Attributes, And ACLs

last updated November 9, 2012 in CentOS, RedHat and Friends, Security, SELinux

How do I use tar and rsync command that can preserve the ACLs, extended attributes and SELinux contexts under CentOS / RHEL / Fedora Linux server while making backups?

HowTo: Temporarily Switch Off SELinux Enforcement

last updated November 10, 2012 in SELinux

How do I temporarily switch off SELinux enforcement under Red Hat Enterprise Linux server version 6.x using command prompt? How do I turn on SELinux enforcement again?

Linux Syslogd: Nothing Gets Logged Using /dev/log And /jail/apache/dev/log

last updated August 22, 2010 in Apache, CentOS, Linux, RedHat and Friends, SELinux

I‘ve configured my Apache in chrooted jail at /jail/apache directory. However, my syslogd is not working and nothing gets logged using /dev/log and /jail/apache/dev/log. How do I fix this problem under CentOS 5.x AMD64 with SELinux?

CentOS / Redhat: Turn On SELinux Protection

last updated March 31, 2017 in CentOS, Linux, Networking, RedHat and Friends, Security, SELinux

SELinux enforces the idea that programs should be limited in what files they can access and what actions they can take. However, by default it is turned off under RHEL / CentOS 5.x server? How do I turn it on?

Linux Kernel /etc/sysctl.conf Security Hardening

last updated October 23, 2018 in CentOS, Debian / Ubuntu, Linux, RedHat and Friends, Security, SELinux, Suse, Ubuntu Linux

How do I set advanced security options of the TCP/IP stack and virtual memory to improve the security and performance of my Linux based system? How do I configure Linux kernel to prevent certain kinds of attacks using /etc/sysctl.conf? How do I set Linux kernel parameters?

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