From thehackernews, it was said when the UID is larger than INT_MAX, which is 2147483647, privilege validation is improperly handled and that gives the user right to run systemctl commands as if he/she is a privileged user. What is my INT_MAX? Though it’s hard to imagine who would use such an UID when they usually starts with 1000. However, if Linux is integrated with AD, the AD users ID are mapped…
I don’t think I’ve ever said anything good about Azure, but I’ve finally ran into one today. Someone screwed up sshd_config and the service would not start anymore. With the run script tool, I was able to revert the config to the original version and restart the service. Fortunately, the changes were checked into RCS, which made recovery relatively easy. Here, I checked out the original version of the config…
Let’s take a look at how to build a really simple Linux package. The most common package formats are definitely .deb and .rpm. One will find them on Debian-variants and Redhat-variants respectively. In the following examples, a package will be created and it will contain 1 script.The script depends on Python so I want the package management tool to handle that for me too. The script’s name is goldenRatio.sh and…
Ever since Mac deploys the night shift feature, I could not stop using it. For someone who needs to look at monitors for long hours, I absolutely love it. I can also do it with Linux.
Moreutils comes with additional Unix utilities. Sysadmin loves tools. Let’s see what tools are available.
There are times when I need to analyse Apache’s logs. Some of them can be quite large. Here, I’ll compare several methods and see if there is a faster way of doing so.
Ever feel your browser always perform slower on Linux or taking more cpu then other OS platforms? Well I did and as it turns out, I can manually enable GPU acceleration. Check out the instructions in this link. Do you have it enabled? Quickly check by opening chrome://gpu To enable it, see instructions on http://www.webupd8.org/2014/01/enable-hardware-acceleration-in-chrome.html To see GPU’s utilization, radeontop works on AMD chips. I realise I didn’t have hardware…
Azure hard-codes disk size and it cannot be changed during deployment. Resizing root disk on Azure is often a required task. Here is how a root disk can be resized. I learned this the hard way.
It is possible to use CloudWatch to monitor your disk and memory usage. There are very good information on AWS – http://docs.aws.amazon.com/AmazonCloudWatch/latest/DeveloperGuide/mon-scripts-perl.html For the impatient, here is how to get it done.
On Linux, it is possible to power off a USB device using command line. It’s perfect for my USB backup drive. I can power it off after backup every night, and power it on before the job starts. This saves power, reduce heat, and more importantly, prevent accidental or unexpected changes as the device is completely offline.