centos 7 Archives

Mysql resource is unable to start after failover due to permission change on ‘/var/lib/mysql’ directory.

By explinux April 8, 2021centos 7, centos 8, mysql, rhel 7No Comments

If you are working on a cluster, after a sudden failover you face the issue that Mysql is unable to start. In this article, we will show you how to…

Grub2 files are missing from /boot. How to recover ?

By explinux February 23, 2021boot, centos 7, centos 8, rhel 7, rhel 8No Comments

Grub2 or Boot Repair Due to some file corruption or mishandling we lost grub. This can cause the system to hang in the boot.When you reboot the system it will not…

How to disable EEE feature on the nic on RHEL7-8/Centos7-8

By explinux January 19, 2021centos 7, centos 8, TroubleshootNo Comments

EnvironmentRed Hat Enterprise Linux 7Red Hat Enterprise Linux 8CentOS 7CentOS 8IssueWould like to disable the (Energy Efficient Ethernet) EEE feature of the NIC.ResolutionTo disable EEE use the ethtool command. In…

How to reset my MySQL database root password?

By explinux January 17, 2021centos 7, centos 8, mysql, rhel 7, rhel 8No Comments

How to reset my MySQL database root password?This is a very common issue if you are working in a big environment or a system where everything is automated. People always…

How to set ulimit or change the default soft or hard limit for the number of user’s processes?

By explinux December 11, 2020centos 7, centos 8, limit, ulimitNo Comments

Environment RHEL/CentOS 5 RHEL/CentOS 6 RHEL/CentOS 7 RHEL/CentOS 8 Issue The default configuration file for ulimit is /etc/security/limits.d/90-nproc.conf for (RHEL5, RHEL6), /etc/security/limits.d/20-nproc.conf for (RHEL7) and for RHEL 8 we have to create…

RHEL 7 Slow Login – Delay in SSH login

By explinux November 14, 2020centos 7, ISSUE, RHEL7, TroubleshootNo Comments

RHEL 7 Slow Login - Delay in SSH login Why does it take a long time to get on login prompt after successful authentication with ssh with correct credentials?ISSUE:It takes more…

How to Use vi Editor in Linux and vi Editor Cheat-Sheet with 38 Shortcut

By explinux July 5, 2020centos 7, centos 8, linux, linux commands, rhel 7, rhel 8, ubuntuNo Comments

How to Use vi Editor in Linux and vi Editor Command in Linux How to Use vi Editor in Linux and vi Editor Command in Linux vi Editor : .…

How to Check and Disable Selinux in Centos7/8, RHEL 7/8

By explinux June 30, 2020linux, centos 7, linux tricks, rhel 7, rhel 8No Comments

How to check and disable Selinux in Centos7/8, RHEL 7/8 SELinux - Security-Enhanced Linux It is a security architecture that gives you more control over the system that others can…

How to Use and Enable/Disable Firewall in Centos7/8, RHEL 7/8

By explinux June 28, 2020centos 7, linux, linux tricks, rhel 7, rhel 8No Comments

How to Check and Disable Firewall in Centos7/8, RHEL 7/8 As we know the firewall is very important for our system or server security. In some cases where you have…

How to Install Google Chrome 83 On Rhel 7 / Centos 7 And Dependency Resolution – 2021 Updated

By explinux May 24, 2020centos 7, google chrome, linux, rhel 7No Comments

How to Install Google Chrome 83 On Rhel 7 / Centos 7 And Dependency Resolution - 2021 Updated This is an updated tutorial to install Google Chrome on Rhel 7…