blog.masa23.jp

This content was moved from Qiita. While it’s common to deliver images and other content with S3 + CloudFront, if the delivery target is limited to Japan, it might be cheaper to use S3 + Sakura Cloud’s CDN service, Web Accelerator. So, let’s set it up. I haven’t verified if the actual billing will be cheaper. The delivery fee for CloudFront is 0.140 USD (15.8 yen as of December 28, 2017) per GiB in Japan, so Web Accelerator, which costs 5 yen (including tax) per GiB, seems cheaper. …

This content was moved from Qiita. Configuration Notes for Ubuntu 18.04 Personal notes on changes in Ubuntu versions that caught my attention. Changing the Hostname # hostnamectl set-hostname sv1.example.jp Setting up iptables With netplan, it doesn’t work well with if-pre-up.d? Using iptables-persistent works well. # apt install iptables-persistent # <configure iptables> # iptables-save > /etc/iptables/rules.v4 # ip6tables-save > /etc/iptables/rules.v6 Configuring netplan Place the file in yaml format in /etc/netplan/*.yaml network: ethernets: ens3: addresses: - 192. …

This content has been moved from Qiita. Let’s use Let’s Encrypt with Sakura Cloud Web Accelerator. Update (2021/01/29) The Web Accelerator now has an auto-renewal feature for Let’s Encrypt, so there’s no need for the following efforts anymore! 🎉 Announcing Automatic Renewal of Let’s Encrypt Certificates on Web Accelerator Using Automatic Renewal Certificates for Let’s Encrypt on Web Accelerator Overview When using a custom domain with Sakura Cloud Web Accelerator, you can enable SSL (including HTTP2 support) by installing an SSL certificate. …

This content has been moved from Qiita. In a certain setup, keepalived is used as a load balancer with VRRP and LVS. This load balancer is configured with numerous IP addresses (due to SSL certificates, etc.) as shown below. I encountered a problem where the newly added IP addresses had no connectivity. keepalived Load Balancer Configuration (DSR Configuration) IP addresses used for SSL on the VIP are routed from the router using static routes and added as needed. …

This content has been moved from Qiita. To specify date formatting in Golang, you use the time.Format function. I needed to format dates for graphite-api using the following format: However, I encountered issues where it worked on some environments but not on others, wasting a lot of time. The problem turned out to be a bug that was fixed in a Golang version update. Specifying the Format Specified format: HH:SS_YYYYMMDD So in Golang: Format("15:04_20060102") Test Code package main import ( "fmt" "time" ) func main() { now := time. …

This content has been moved from Qiita. There are times when you want to relax the Max open files setting for services like nginx. Prior to CentOS7, which did not use systemd, we had to modify limits.conf. However, with systemd, the process is simpler. Let’s assume we’re having trouble with nginx. Checking the Current Settings # grep "^Max open files" /proc/`cat /var/run/nginx.pid`/limits Max open files 1024 4096 files Currently, the hard limit is 4096, meaning that a single process cannot open more than 4096 files. …

This content has been moved from Qiita. When coding in Go using Vim, you can make coding easier with syntax highlighting and tools like gofmt and goimports. However, I found various articles on this topic to be complex, so I decided to compile my own simplified guide. Installing Golang OS X $ brew install golang CentOS $ sudo yum install golang --enablerepo=epel Ubuntu $ sudo apt install golang Creating a Directory for GOPATH $ mkdir $HOME/go Setting Environment Variables in . …

This guide briefly describes how to update the firmware. Ensure you can retrieve the firmware from a tftp server beforehand. Check the current version Router(config)# show version NEC Portable Internetwork Core Operating System Software IX Series IX2010 (DS) Software, Version 5.1.18, RELEASE SOFTWARE Compiled Jul 18-Fri-2003 13:32:49 JST #2, coregen-5.1 ROM: System Bootstrap, Version 5.5 System Diagnostic, Version 4.3 uptime is 1 minute System image file is "ix2010-ds-5.1.18.ldc" IX2010 (MPC8250) processor with 57344K bytes of memory. …

What is a Super Reset? A super reset is a method to forcibly reset the router to its initial state, used when you forget the login password, for example. Reset Procedure Prepare for the reset. Connect a serial cable to the CONSOLE port and prepare to log in via serial connection. Turn off the power and toggle the dip switch. Ensure the BUSY lamp is not blinking, then turn off the power switch next to the power cable to shut down the router. …

About This Site This blog is a personal blog written by masa23 as a personal memo. As I write casually every day, please do not have high expectations for the content. The articles are translated using ChatGPT based on the original Japanese text. Contact X (Twitter): @yamamasa23 GitHub: masa23 Mail: masa(at)masa23.jp …