System Admin - Centmin Mod Blog

Configserver CSF Firewall Shutdown on August 31, 2025

Updated on September 8, 2025 by eva2000 Reading Time: 4 minutes

On August 31, 2025, the Linux server administration community witnessed the end of an era as ConfigServer Security & Firewall (CSF) officially shut down after 20+ years of service. For hundreds of thousands of servers worldwide, CSF wasn’t just another utility – it was the cornerstone of their security infrastructure. The shutdown left many scrambling …

What Are The Benefits Of Using Cloudflare Business Plan?

Updated on September 26, 2023 by eva2000 Reading Time: 4 minutes

Cloudflare’s Business plan costs 10x more than their Pro plan so the question that some folks ask is whether Cloudflare’s Business plan is worth it? I’ve been a Cloudflare customer for 11yrs now and a Cloudflare Community MVP for 5yrs and have used all Cloudflare plans – Free, Pro, Business and Enterprise. This article outlines the benefits from my own usage experiences.

Testing Page Speed With Cloudflare Automatic Signed Exchanges & Google Search Cache

Updated on October 5, 2022 by eva2000 Reading Time: 15 minutes

During Cloudflare Speed Week 2021, Cloudflare announced Cloudflare Automatic Signed Exchanges (SXGs) which improve page load speed and Google Core Web Vital metrics like Largest Contentful Paint (LCP) by allowing Cloudflare to serve up a signed cached version of your web page to Google search engine crawler which can then prefetch the cached version to their own local cache and to the visitor’s web browser local cache.

How To Switch From Letsencrypt to ZeroSSL Free SSL Certificates On Centmin Mod

Updated on April 1, 2022 by eva2000 Reading Time: 4 minutes

Centmin Mod uses Neil Pang’s acme.sh client as the underlying tool to issue and obtain free Letsencrypt certificates for Nginx HTTPS auto created sites. The acme.sh client has added support for other free ACME protocol compatible CA SSL providers like Buypass (BuyPass Go SSL) and ZeroSSL. This guide shows how you can switch over from Letsencrypt to using ZeroSSL SSL certificates which uses Sectigo (Comodo) certificates and supports free wildcard SSL certificates and doesn’t have any rate limiting for SSL certificate issuance.

Centmin Mod Managing Letsencrypt DST Root CA X3 Certificate Expiration On CentOS 7

Updated on March 15, 2024 by eva2000 Reading Time: 11 minutes

On September 30, 2021, Letsencrypt’s DST Root CA X3 cross-sign (by IdentTrust) root certificate expired and was replaced with Letsencrypt’s own ISRG Root X1 CA root certificate. I’ll outline how Centmin Mod LEMP stack handled the Letsencrypt’s DST Root CA X3 certificate expiration for CentOS 7.x operating systems.

How To Bulk Domain Transfer To Cloudflare Registrar And Save On Domain Renewal Costs

Updated on March 31, 2022 by eva2000 Reading Time: 10 minutes

Cloudflare Domain Registrar is a privacy focused no markup price domain registrar provider which can reduce your domain renewal costs significantly. However, a requirement is that you use their Cloudflare nameservers and have onboarded your domain(s) to their service first. This guide will show how you can bulk domain transfer many domains including onboarding to Cloudflare service and nameservers.

How To Bulk Domain Transfer Out From Cloudflare Registrar Via Cloudflare API

Updated on August 12, 2022 by eva2000 Reading Time: 6 minutes

Cloudflare Registrar is a cost price domain registrar offering cheap domain transfers and registrations. However, at one point you may need to transfer many domains out of Cloudflare Registrar to another registrar – offering discount domain transfer pricing or specials. This guide will show you how to bulk transfer out the domains via Cloudflare Registrar API via command line or scripting.

Ran IPTables Flush? How To Regain SSH Access After Being Locked Out Of CSF Firewall Servers

Updated on February 13, 2021 by eva2000 Reading Time: 21 minutes

You’ve accidentally run the SSH command iptables -F and have locked yourself out of your server and can not SSH login again. So how do you regain SSH access? Centmin Mod LEMP stack uses CSF Firewall which is a wrapper interface to CentOS system’s underlying IPTables. If you run the SSH command, iptables -F you may end up locking yourself out of the server as this command flushes all the existing IPTable rules that are configured and setup by CSF Firewall at startup. This guide will outline ways you can possibly regain SSH access using example VPS providers – Upcloud, DigitalOcean, Vultr, Linode, Hetzner and Amazon AWS EC2 instance servers.