Linux and Unix, Open Source, Linux Howtos
xfs_repair command repairs corrupt or damaged XFS filesystems. It’s highly scalable, high-performance and is designed to effectively repair even very large file systems with many inodes. Unlike other Linux file …
How to Check and Repair XFS Filesystem in RHEL Read More
By default, the sendmail runs locally on localhost.localdomain and tries to send the mail with the [email protected] to the remote smtp server, which would get rejected as the localhost.localdomain will …
How to configure a SMTP relay host in Sendmail Read More
Most companies scan infrastructure devices for vulnerability every quarter, but the duration may vary depending on the company’s ITSM policy. After the security scan, if the security team finds vulnerabilities …
How to check if an RHEL system is vulnerable to a CVE Read More
Sometimes the Linux system crashes due to corruption of the root filesystem, in which case you need to boot the system into recovery mode and then repair your file system. …
How to Repair Corrupted root filesystem in RHEL 8 Read More
You may need to reinstall the GRUB 2 boot loader when the system does not boot into the GRUB menu. This may be due to the installation of security patches …
How to Recover Corrupted GRUB 2 Bootloader in RHEL 8 Read More
As the name implies, rescue mode is provided to rescue your system when the system unable to boot normally into Red Hat Enterprise Linux with runlevel 3 or 5. You …
How to boot RHEL 8 into Rescue mode from installation DVD/ISO Read More
This article explains how to bootup RHEL/CentOS 7 and 8 system into emergency mode through systemd emergency target unit. There are situations where you need to boot Red Hat 8/7 …
How to boot RHEL 8/7 into Emergency Mode Read More
This article describes how to bootup RHEL/CentOS 8 system into rescue mode using the systemd rescue target unit. You may need to boot your RHEL 7/8 and CentOS 7/8 system …
How to boot RHEL 8 system into Rescue mode Read More
When things go wrong on the Linux system, it allows the user to repair the system by booting into a different troubleshooting mode, such as recovery mode, single user mode, …
How to Boot a System into Rescue Mode from Installation DVD/ISO on CentOS 7 Read More
If the existing root password is no longer memorize or is forgotten, you can recover the forgotten root password on boot by switching into single user mode. This guide describes …
How to Recover root Password on CentOS/RHEL 8 Read More