Hong's Tech Blog

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Leong Hean Hong

The blog is older than you know. I prefer counting from the emergence of one integral anomaly to the emergence of the next, in which case this is the forth version.

Automate Homebrew Upgrade

Nov 5, 2020 1 min read

It is important to keep OS and installed software updated. Sometime updates come with feature enhancements, security fixes, bug fixes, and performance optimisations. So frequent updates keep system healthy. This is a script I wrote to automate daily ...

Setup Fortinet VPN Client In CentOS 7

My applications need to access services in client's private network. I am using openfortivpn to connect to Fortigate SSL VPN server. It should work for PPP VPN too. Installation Checkout https://github.com/adrienverge/openfortivpn#installing for inst...

Unban IP In Fail2ban

Fail2Ban is an intrusion prevention software framework that protects computer servers from brute-force attacks. Source: https://en.wikipedia.org/wiki/Fail2ban Fail2ban detects repeated failed logins, and bans the IP address. Subsequent attempt to es...

OpenSSL Common Usage

OpenSSL is a powerful Linux command for managing certificates. These are some common operations I frequently use. Generate RSA Key Pair This command generates a 2048 bits private key. openssl genrsa -out example.key 2048 Verify private and public ke...

Installing Netezza Client and ODBC Driver In CentOS 7

IBM Netezza is a data warehouse appliance. It partially supports SQL-92 (SQL/2). Unfortunately the software is proprietary. Besides the limited articles on IBM Knowledge Center, it is quite hard to find help on the Stack Overflow. This is how I setup...

Auto-restart Crashed Systemd Service

Systemd is a system and service manager for Linux operating systems. It is designed to be backward compatible with SysV init scripts, and provides a number of features such as parallel startup of system services at boot time, on-demand activation of ...