Introduction to Active Directory (AD)

Workgroup, homegroup and Windows Domain A workgroup is a group of computers on the same local network. A Windows computer not joined to a domain is part of a workgroup. In a workgroup, no computer has control over any other computer and it does not require a password. Any computer can join or leave a … Read moreIntroduction to Active Directory (AD)

Set up automation with Ansible

Ansible is very flexible automation tools with many benefits. The free version is command-line based and here is an example to set it up. Environment setup Ansible 2.8 is required or some command may not work. Ansible files (including playbooks, tasks and inventory files) are all located in /home/glowing/ansible Default inventory file needs to be … Read moreSet up automation with Ansible

Redhat Firewall configuration: firewalld vs iptables

There are in general two options to deploy firewall rules, firewalld and iptables. Firewalld can be installed and executed as a systemd service, and it is supposed to replace iptables. This article describes how to configure both. Iptables involves three different services for IPv4(iptables), IPv6(ip6tables), and software bridging (ebtables). Firewalld only involves a single service … Read moreRedhat Firewall configuration: firewalld vs iptables

cron and anacron in RedHat Linux (How logrotate works)

Cron and anacron We all know cron is a job scheduler. Many admin uses crontab to manage scheduled task. It is also important to know that crontab works at different levels as well, as well as the distinction between cron and anacron. They are similar, but different, managed by different sets of files. Below is … Read morecron and anacron in RedHat Linux (How logrotate works)