Securely specify mysql credentials in automated scripts

Often, you may want to run a script that uses a username and password to access data in a MySQL database. Securely running a script like this manually is easy – simply use the ‘-p’ option for the MySQL client, and it will prompt you for the password. However, this is not an option if you want to automate the script.

There are several ways to provide the password in a way that can be used with automated scripts, but only one that is both flexible and secure. You can specify the password on the command line itself (with ‘mysql -p ‘); however, this allows the password be seen by other users who run commands like ‘ps’. Another option is setting the environment variable “MYSQL_PWD” to the password, but this can also be seen by other users. Continue reading “Securely specify mysql credentials in automated scripts”

Building a kernel RPM from source

While it is reasonably easy to build a kernel RPM on a Redhat or CentOS system using the kernel src rpm, another way is to do a standard kernel build (download your kernel from, configure as usual. However, instead of just doing a standard “make” or “make bzImage”, do “make rpm“, and voila! You’ll be left with your kernel rpm in /usr/src/redhat/RPMS/{arch}, and your very own src rpm in /usr/src/redhat/SRPMS. Easy, right?