Everyday Notes from a Linux Administrator
Linux
Unison is a file-synchronization tool similar to rsync. The main difference is that unison tracks changes on both directions so you don’t to have two separate rsync to pull and push data on both folders. This means files changed on server1 will be replicated to server2 and vice versa. It’s also easier to setup since no scripting necessary.
Continue reading “Unison – file/folder sync for Centos/RHEL 6”
If you are a programmer or work with programmers, managing code repositories is one the task you’ll likely to encounter. Git has become widely popular for storing/managing code repositories.
Gitblit GO is an open-source, pure Java stack for managing, viewing, and serving Git repositories. It’s designed primarily as a tool for workgroups who want to host centralized repositories. Gitblit GO is an integrated, single-stack solution based on Jetty.
In this fast tutorial, you’ll be able to install GitBlit Go and create you own git repositories.
Continue reading “Install Gitblit Go on CentOS/RHEL 6/7”
The SAMBA protocol allow Linux hosts to create/mount windows compatible network shared folders. Samba shares are preferred when the LAN comprises of both Widnows and Linux computers. In this tutorial, we’ll create a samba shared folder with username/password authentication. The shared folder will be accessible to all Linux and Windows computer on the local network.
Continue reading “Setup Samba file sharing for CentOS 6”
Iptables is an extremely flexible command-line firewall utility built for Linux operating systems. It uses policy chains to allow or block traffic. When a connection tries to establish itself on your system, iptables looks for a rule in its list to match it to. If it doesn’t find one, it resorts to the default action. Securing any server will surely require a firewall configuration and iptables should be on every system admins toolbox.
Continue reading “Linux iptables Configuration Tutorial”
The standard Linux directory structure mostly follows the POSIX Filesystem Hierarchy Standard. One of the system folders most commonly edited or modified is the /etc directory. Here’s a summary of what files/folders should you expect to see here and what are their functions.
Mainly, the /etc contains system-global configuration files, which affects how programs run and how the behaves for all users.
The following tutorials are example of the essential MySQL commands and techniques needed by system administrators. Although there are people/departments that specializes on Database administration, knowing these commands will help you understand and collaborate effectively with database administrators.
Continue reading “Important MySQL commands”
When you forgot the password to your MySQL server, you can reset it using the following steps. This will require a downtime since you are going to stop MySQL service. After this, remember to keep you mysql root password.
Some VPS on hosting providers like Amazon Web Services do not have swap by default. Or if your server was configured with small swap and now you want to increase it. Below are instructions on how to increase swap area.
Continue reading “Create a swap file in Linux”