Category: General

Upgrading Percona XtraDB Cluster

Guide can be found at https://www.percona.com/doc/percona-xtradb-cluster/5.7/howtos/upgrade_guide.html. There is no need to re-invent the wheel. I am too lazy to do it. Issue 1: If you are running mysql_upgrade and face the …

OpenVPN installation quick tutorial

Just a quick introduction for OpenVPN installation since there is a good work from https://github.com/Nyr/openvpn-install that helps install in 1-click. I just add some extra notes when installing as well as connecting for …

Install OpenVPN server CentOS 7

Today I will brief necessary steps for installing OpenVPN server CentOS 7. This will include custom server name and also rules for csf firewall which is widely used. The OpenVPN server …

Install Chef server Lets Encrypt

Do not want to mention what Chef is, or what Let’s Encrypt is. This is just a short step-by-step tutorial to guide you how to install Chef server Lets Encrypt …

Migrate Gitlab to new server

When migrating gitlab to a new server, you might face much problems of in-compatible versions, different OS (so different latest gitlab version), etc. The best way is to upgrade the …

Real IP from Amazon Load Balancers

If you are running an EC2 instance behind an Amazon Elastic Load Balancer (ELB), you’ll find that the visitors’ IPs are hided behind the load balancer, so your application cannot …

Some small tweaks for apache

I have not worked on apache for a long time (if you don’t know, I am a big fan of NginX with PHP-FPM instead of surviving with apache :lol:), so in …