How to disable ICMP and ICMPv6 redirects in Linux
In this tutorial we will learn how to disable ICMP and ICMPv6 redirects on the Linux server. ICMP redirects are used on routers so if your Linux server is not acting as a router then ...
security
How to setup http/https proxy with special characters in password
In this tutorial I will share the steps to setup http_proxy or https_proxy when your username or password contains special characters such as comma, @, # etc. Error: Unable to set http_proxy or https_proxy ...
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4 easy methods to check sudo access for user in Linux
How to check if a normal user has sudo access? Is it possible to know if a user has sudo access using a script? The script prompts for user password if I attempt to use ...
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How to disable SELinux (with and without reboot)
In this tutorial I will share you the steps to disable SELinux properly in Linux environment although it is not recommended instead you can choose to change active mode to Permissive. We will cover this ...
SOLVED: SSH fails with postponed publickey error
The other day I was getting this error "Postponed publickey" in my /var/log/sshd file on RHEL 7. It took me some time to debug the error and understand the root cause. Let me tell you ...
How to disable ICMP timestamp responses in Linux
In production environment, security is one of the most important factor due to which we perform regular security scans and perform regular patch management to fix security vulnerabilities. One such vulnerability is related to ICMP ...
Linux sftp restrict user to specific directory | setup sftp chroot jail
In this article I will share step by step guide on how to configure sftp server in Linux with examples covering the below topics in detail: Install sftp on Linux Configure sftp chroot Create sftp ...
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Linux lvm snapshot backup and restore tutorial RHEL/CentOS 7/8
In this article I will give you and overview on Linux LVM snapshot backup and restore and cover below topics relatd to LVM Snapshots: Overview on LVM Snapshots Comparison between LVM1 and LVM2 Snapshots Create, ...
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6 easy steps to setup offline two factor authentication in Linux
In this article I will share Step-by-Step Guide to Install and Configure Offline Two Factor Authentication using Open Source Google Authenticator for below scenarios in Linux Configure offline two factor authentication for SSH Configure offline ...
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Unix or Linux Sticky Bit | Detailed Beginners Guide
The Linux sticky bit for directories, it prevents unprivileged users from removing or renaming a file in the directory unless they own the file or the directory. This is called the restricted deletion flag for the directory.
The directories /tmp and /var/tmp are typical candidates for the linux sticky bit - they are directories in which any user can typically create files. The permissions for these two directories are often read, write, and execute for everyone (user, group, and other). But users should not be able to delete or rename files owned by others.