For a long time, I have stuck on many hosted monitoring softwares to avoid management effort on a self-hosted monitoring system. However, free stuffs cannot go long so I must move from services to services. This makes me tired! Thus I decided to return to a self-hosted solution so that […]
Introduction As when I started working on React more than 1 year ago, I faced many noob issues that I think many newbies will also struggle with. Several weeks ago, I enter the React Native world, and I have been learning as a newbie again. As I do not have […]
NameNode (NN) NN holds the metadata of the files in HDFS, maintains the entire metadata in RAM It is important to run NN from a machine that has lots of RAM at its disposal. The higher the number of files in HDFS, the higher the consumption of RAM In case the […]
Today I restored a Cloudera disk to Proxmox KVM to try out this excellent big data open source. I think the procedure is not hard, but it is quite verbose and it might take time to find out where to find each option. So I decided to note here the […]
Well, after a year returning to Docker, I can still be considered as a beginner since I forgot almost things that I did before :shame: So this entry, Docker – Beginner’s Notes, is just a way that helps me in the future (hopefully). Useful commands to remember: docker images, docker ps […]
In this quick tutorials, I will mention a method to Auto-Renew / Validate a Let’s encrypt certificates on CloudFlare-enabled websites. As you may know, if you use CloudFlare for DNS/CDN purposes, then you cannot access to several server ports for Let’s Encrypt to validate the certification request. So in this […]
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 following error: “mysql_upgrade: [ERROR] 1136: Column count doesn’t match value count at row 1”, just do as follows: Clone https://github.com/mysql/mysql-sys and […]
