In this page, I will show you how to adjust the brewing pressure of Lelit PL92t.
Author: xpk
jq transformation
I was working on a terraform module that creates cloudwatch alarms. AWS uniquely identifies metric with dimensions. All dimensions must be supplied to select the metric. In this case, the dimension comes from CWAgent and terraform external data source is used to obtain the dimension. A bit of jq work is needed to transform the…
Enable zswap on memory-limited systems
On systems where memory is limited – be that a SOC compute or a low-end virtual machine, enable zswap gives you more usable memory. This is similar to Stacker which compress your data and let you have more space. Back in those days, hard drives were measures in MB!
NVME SSD lifetime
Wonder if your NVME SSD is reaching retirement age? Follow these simple steps to get an idea.
Terraform module: Delete default VPCs
Terraform itself does not have the capability to delete default VPCs. In this example, I will use terraform and a shell script to perform the deletion.
Using U2F key for sudo authentication
I got my U2F key for use with online accounts. It is cheaper than the popular Yubikey and it works well. Did you know you can use it for sudo or pam authentication? Here is how.
Create security groups with terraform using a map
If you have 10s of security group rules, it’s not effective to use aws_security_group_rule directly. Here I use a map and feed it to a module.
Dumping AWS Organization tree
Recently, I’m tasked to transfer a set of AWS accounts to another cloud service provider. I realize there is not a simple way to capture the organizational tree structure. Knowing the tree structure is quite important in understanding the net effects of SCP. A python script is developed to solve this problem.
Free is the most expensive
Today, I found out my domain one.27 is offline. Took me a while to figure out freenom might have deleted my domain for unknown reasons. Fortunately, this is just a personal blog. Nothing important runs off this domain. Spent half hour to reconfigure my cloudflared argo tunnel and changed the header image. Everything is back…
Terraform conditional resource and blocks
In this example, I will first demonstrate how to conditionally create a terraform resource. Then how to add a configuration block inside a resource conditionally.