Deepak Prasad

Containerization has flipped the way we build, deliver, and scale applications. Containers offer developers lightweight, efficient and portable environments

Use pam_tally2 to lock user account in Linux after X failed login attempts. Lock root and normal user, exclude users and group from being locked out.

This pam_faillock module maintains a list of failed authentication attempts per user during a specified interval and locks the account in case there were more than deny consecutive failed authentications.

Step by step guide to add linux to windows Domain (Active Directory) using Realm tool on RHEL/CentOS 7/8. Join linux to windows domain. sssd active directory centos 7.

Step by Step instructions to configure OpenLDAP over SSL/TLS using self signed certificates or Third party Root CA signed certificates using OpenSSL in Rocy Linux 8.

OpenLDAP is an open-source implementation of the Lightweight Directory Access Protocol (LDAP). It's widely used for managing directory information, providing

how to configure sftp server in linux step by step to sftp restrict user to specific directory in Linux Setup sftp chroot jail with authorized_keys passwordless

Learn the steps to install and configure OpenLDAP on Linux using ldapmodify and cn=config database. Add and delete user, group, objects from ldap database

Step by step instructions to configure openldap master slave replication using Rocky Linux 8. test the master slave replication.

ldap tutorial for beginners covers basics of LDAP and OpenLDAP like What is LDAP? Why do we use LDAP? What are the terminologies used with LDAP? Daemons of LDAP

Steps to install and configure ldap client using SSSD on RHEL and CentOS 8 Linux. The configuration using SSSD over TLS and SSL encryption for ldap client

Steps to run script with systemd at shutdown only with examples in CentOS/RHEL 7/8 in Linux. Run script or command before shutdown but not at reboot

How to execute command or run script after N minutes of boot using systemd timer in CentOS/RHEL 7/8 Linux fix systemctl failing with unknown section 'Timer'

Shell script to read user input during boot stage in Linux with a systemd service in CentOS/RHEL 7/8 Linux. Take input at the startup script in Linux.

How to execute and run script at startup after N minutes with delay using systemd and without cronjob in CentOS/RHEL 7/8 Linux before login prompt appears

Steps to execute and run script with systemd right before shutdown in CentOS/RHEL 7/8 Linux. Use Before=shutdown.target to execute command before shutdown

How to execute or run script with systemd right before login prompt in CentOS/RHEL 7/8 Linux between rc-local.service and getty.target in service unit file

run service as user linux. systemd allow user to start service. systemd start service as user on boot run systemd service as specific user group CentOS/RHEl 7/8

In systemd all the services are part of unit files so to list services we must define --type= argument and to get the state of individual services we need --state=

An overview on systemd-journald service, how logging happens in RHEL 7 Linux with Journals and systemd-journald logrotate. Compare systemd-journald vs rsyslogd

Enable persistent logging in systemd-journald by changing storage type to persistent in journald.conf to store logs in /var/log/journal without reboot

We mount filesystem using /etc/fstab to make the changes persistent across reboot. Now there is another way to mount filesystem without fstab using systemd.

Steps to automount file system using systemd automount unit file without /etc/fstab to automatically mount and unmount file system in rhel/centos 7 and 8

Creating /forcefsck and /fsckoptions doesn't work on CentOS/RHEL 7/8 Linux How to perform force file system check on boot (next reboot) using systemd-fsck?

How to execute a script after a network file system is mounted? How to start a systemd service only after NFS share is mounted and available in Linux

How to mount Oracle VirtualBox shared folder using systemd unit file at system startup? How to execute a script during reboot on the shared folder from Vbox using systemd?

Step by Step instructions to create systemd service in Linux. Detailed explanation of all the field in systemd service unit file

Steps to create root and intermediate CA certificate and combine them to openssl create certificate chain. Openssl verify certificate chain (CA bundle)

Step by step instruction to generate Certificate Signing Request (CSR) for Subject Alternative Name (SAN) certificates using openssl with examples in Linux

Resize primary partition shrink and extend non lvm root, boot and other primary partition, change size of partition using unallocated free space fdisk & parted