How to generate LA? Sometimes you need to simulate load on your server to check system behavior under heavy load. My case was to check scalability script that monitors backend load and creates new hosts in Digital Ocean. Previously I wrote the article about Load Average and the meaning of this metric. Here you can … Continue reading How to generate LA?
FreeBSD htop Finally htop released on FreeBSD! It took 10 releases of the FreeBSD to get htop. Htop is a very useful utility that I was missing in FreeBSD. So, good news, htop is now available from the FreeBSD ports collection or packages(pkg). The installation of the htop is very easy. Installation FreeBSD htop takes … Continue reading FreeBSD htop
GeoIP log analysis with bash. Running websites or other online services usually we want to get as much statistics about visitors as possible. There are plenty of system that can provide us web-based statistics. But there is another way. True admin/devops way is to analyse logs. Any service can provide access logs: nginx, apache, haproxy, … Continue reading GeoIP log analysis with bash
VPN over SSH SSH Tunnel SSH based tunneling VPN-SSH Since OpenSSH 4.3 tun/tap device can be used to encrypt a tunnel and create VPN over SSH. This is much like other TLS based VPN solutions e.g. OpenVPN. The main advantage to use SSH based tunneling is no need to install and configure additional software. … Continue reading VPN over SSH
NTP Server Setup: Time synchronization Network Time Protocol (NTP) is a networking protocol for clock synchronisation between computer systems over packet-switched, variable-latency data networks. In operation since before 1985, NTP is one of the oldest Internet protocols in use. NTP was originally designed by David L. Mills of the University of Delaware, who … Continue reading NTP Server Setup: Time synchronization