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Blogs

Jun 28, 2023
How to Deploy a Lambda Function to Delete EC2 Instance Periodically
When you have many EC2 instances, you may forget to stop instances that you are not using. If you keep running the instances that aren't...

Jun 15, 2023
I Created a CLI Tool to Edit AWS Security Groups in Golang
What is goacl The goacl is a CLI tool written in Golang. You can view a list of AWS security groups and add rules for specific groups....
![[The Object Storages] What’s the Difference Between Amazon S3 and Wasabi](https://static.wixstatic.com/media/9cfabe_8b60a8da6aea4b1cb58858183fea7da5~mv2.png/v1/fill/w_454,h_341,fp_0.50_0.50,q_95,enc_auto/9cfabe_8b60a8da6aea4b1cb58858183fea7da5~mv2.webp)
Jun 1, 2023
[The Object Storages] What’s the Difference Between Amazon S3 and Wasabi
In this article, I’m going to introduce you to the differences between Wasabi (Hot cloud storage) and Amazon S3 (AWS’s object storage)....

May 21, 2023
Wireshark From Scratch
What is Wireshark? It is one of the most famous necessary tools for network engineers. It supports Windows and macOS, and basically...

May 9, 2023
How to Manage Terraform Version Using tfenv
What is tfenv? The tfenv is a tool that’s for managing Terraform versions with CLI. You may have noticed the similarity in the name. The...


Apr 27, 2023
Improving Ways to Use Linux Commands
I’m going to introduce Linux commands and options that are smartly used. For example, $ ps auxwwf | grep httpd | grep -v "grep” This one...


Apr 12, 2023
How to rotate the MySQL slow.log file in log rotation
Have you experienced the MySQL slow.log file that has been accumulating for some time? Don’t you worry, you can use log rotation in this...


Mar 7, 2023
About mysqlpump and Its Advantages
You might already know about “mysqlpump”, but I used this tool as an experiment and I made some suggestions for people who haven’t used...


Feb 15, 2023
How to Display Command History in Linux OS
The “history” command is being used for displaying a list of commands that have been run. The history command Display a list of commands...


Feb 2, 2023
【For Linux Beginners】How to Edit and Save With the vi Command
Hello! I’m going to talk about the vi command which is for editing files in Linux. There are so many options…! The vi command is a...

Jan 23, 2023
How to Create a VPC Environment Using CloudFormation (Vol.2)
This article is a continuation from our last blog post. Let's create a VPC from the template file we created last time. Create a stack...

Jan 18, 2023
How to Create a VPC Environment Using CloudFormation (Template File)
In this article, I’m going to talk about how to write a template file that’s necessary to execute CloudFormation. What is CloudFormation?...


Dec 26, 2022
How to Check Disk Space
The df command is a command to see how much free disk space is left and manage disk space. Since a lot of data remains in the disk day by...


Dec 19, 2022
How to Add Multiple Rules to a Security Group with Terraform
Hi! Usually, when you create security groups, you create inbound rules manually but you may also want to create a security group that has...


Dec 12, 2022
The Reason Why the Unlink Command is Better to Delete Symbolic Links
Hello, Recently I had a chance to deal with symbolic links when I had to renew an SSL certificate. Therefore, when I was doing research...

Oct 5, 2022
Setting Up Basic Authentication with Apache
Used Software virtualbox version 6.1 vagrant version 2.2.19 vagrant box: centos/7 apache version 2.4.6 What is Basic Authentication? In...

Sep 24, 2022
Get an SSL Certificate with Let's Encrypt
Do you know what an SSL certificate is? It is a digital certificate for 'encryption of communication data' and mandatory by default to...


Aug 30, 2022
How to Fix 404 Error When You Try to Install a Package on EC2
This blog post describes how to deal with the following error when trying to install a package on an AWS EC2 instance (graviton). [Errno...


Aug 12, 2022
Oops! Did you forget the root password for MySQL? Here is how to resolve this issue.
Where is a default password In order to find out where a default password is, you need to refer to a path /var/log, and open mysqld.log....


Aug 2, 2022
List of commonly used Apache directives
This article describes the basic configuration items for Apache. Apache configuration files Apache configuration files have different...
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