Introduction Redis official redis-benchmark does not support cluster mode, but it is a note that it can be easily taken by using memtier benchmark . GitHub - RedisLabs/memtier_benchmark: NoSQL Redis and Memcache traffic generation and benchmarking… memtier_benchmark is a command line utility developed by Redis Labs (formerly Garantia Data Ltd.) for load generation…github.com Installation and running

Introduction I this short post I will show how to work with the awk command Example log file Case 1 Sometimes number of characters in the column is different, so it is difficult to see. Use awk to display the columns right justified. root@vagrant:/home/vagrant# cat test.log | awk '{printf("%10s %10s %10s %10s %10s\n",$1,$4,$5,$9,$10)}'…

Introduction In this post I will show how to easily restart pods in Kubernetes using CronJobs. We will use CronJob, not to run our pods, but to schedule a Kubernetes API command that will restart our deployment once day with kubectl rollout restart , if something goes wrong, the old pods…

Introduction As the number of attacks that generate 404 with NGINX has increased, we can take some security measures. One of them is to temporarily stop accepting hosts that over-generate 404s using fail2ban. Let’s start Install Fail2ban yum install fail2ban -y chkconfig --add fail2ban chkconfig fail2ban on Edit file /etc/fail2ban/fail2ban.conf and setup logging …

Motivation CloudFront Functions seems to be better than Lambda Edge as a custom method such as simply adding HTTP headers in CloudFront . List of important security headers Strict-Transport-Security - HTTP | MDN The HTTP Strict-Transport-Security response header (often abbreviated as HSTS) informs browsers that the site should…developer.mozilla.org Content Security Policy (CSP) - HTTP | MDN Content Security Policy (CSP) is an added layer of security that helps to detect and mitigate certain types of attacks…developer.mozilla.org

Introduction I want to prepare a minimal, reconstructable and disposable GitLab environment for checking operation and data migration. It does not foresee that it will be used by other users in actual work. Setup In official documentation there is description how setup GitLab on Docker GitLab Docker images | GitLab The GitLab Docker images are monolithic images of GitLab running all the necessary services in a single container. If…docs.gitlab.com

Introduction When we create virtual machines for local development, it sometimes happens that we need a different time zone than the one we currently have on the system. In this short post, I will show you how to easily do it in vagrant. Vagrant Shell Provisioner For the time being, you can set the…

Introduction CentOS uses Postfix as the default MTA. Even if you install it with the minimal configuration, Postfix is ​​installed and started, which is a waste, so relay it to another place with GMail. For example, all emails sent from the host ozyrys.local are sent from the same GMail user as…