Linux du Command - One of Simple Terminal Command

In daily IT administrator works, sometimes, we will check the free space of some server disks/storages.

First we do by using df -lh command, and then we will get the informations about all disk partition sizes.

If it occurs a small available space in a disk partition, we should check where the largest directory/folder that has the large size.

After search the tools for inspecting the summary of some directories size, I've found du command.

It works very fast in calculating some directories/folders size.

Just open a terminal then direct to root or a directory that you want to know the size. 

Then just type : du -sh

It will show the summary of  the root or a directory sizes.

If you want to get the directories list with all the size : du -sh */ | sort -hr

If you want to get list of files size, type : du -ah

-a : all files

-s : summmary

-h : human readable (K/M/G Byte)

Thank you...

The Powerful VPN Server - SoftEther VPN Server - the Best VPN Server from Japan

In this pandemic condition, most of office staff / employee will do work from home (WFH). It means that, although we stay at home, we might do our computerize office work from home. So, as an IT Administrator should provides a connection between user and server through user and server internet connections.

If office's application or data are hosted as local area connection, VPN is one of alternative gateway between user outside the office and office server/data.

VPN is Virtual Private Network, it means that only registered user will permitted to connect / join to an network. VPN needs a server called VPN Server. Sometimes, VPN server also need a public IP, that will be acted as VPN user address.

I don't have knowledge about VPN, but after some conditions, I must to know about VPN, as an IT Administrator, and then must to know how to configure & implement in my office network.

After some googling, I've found the Freeware SoftEther VPN. It's cool! It's developed by an IT PhD from Tsukuba University Japan. You can download at :

https://www.softether.org/5-download

So, I've downloaded and then install it on office's Windows Server 2008 R2. It has been running well. Then I say, SoftEther VPN is one of amazing VPN system, amazing application. It's also easy to configure (based on softether administrator guide) with our internet connection. It has a user friendly GUI, that easy to understand for beginner user and common setting.

The main concept of the SoftEther VPN Server is creating Virtual Hub Name, the identity name of our VPN Connection. Just provide the public static IP Address from internet provider, and provide the Virtual Hub Name, employees will connecting to your SoftEther VPN Server. User/Client must setup the VPN IP Public and Virtual Hub Name on SoftEther Client Manager.

As an user, we can connect to softether vpn server through SoftEther VPN Client, that can be downloaded from the url above. Just install and setting the VPN Server IP and Virtual Hub Name. Then Just double click then Name for connecting to VPN Server.

SoftEther VPN, It's cool.