Docs on Matus Stafura

Limiting resources with ulimit in Linux

Mon, 03 Feb 2025 00:00:00 +0000

What is ulimit

ulimit is a builtin shell command that allows us to restrict system resources, for example the number of processes, number of open files, maximum logins.

Display the limits

The see the current resource limits for the logged-in user, run:

ulimit -a

Example Output

-t: cpu time (seconds)              unlimited
-f: file size (blocks)              unlimited
-d: data seg size (kbytes)          unlimited
-s: stack size (kbytes)             8192
-c: core file size (blocks)         0
-m: resident set size (kbytes)      unlimited
-u: processes                       22678
-n: file descriptors                2048
-l: locked-in-memory size (kbytes)  735404
-v: address space (kbytes)          unlimited
-x: file locks                      unlimited
-i: pending signals                 22678
-q: bytes in POSIX msg queues       819200
-e: max nice                        0
-r: max rt priority                 0
-N 15:                              unlimited

Setting resource limits

If you want to limit the number of processes for a user

How to Calibrate the Milwaukee pH600 pH Meter

Thu, 30 Jan 2025 00:00:00 +0000

I recently purchased a Milwaukee pH600 pH meter for my microgreens project, and I want to share a quick and easy guide on how to calibrate it. Proper calibration ensures accurate readings, which are crucial for the health and growth of your microgreens.

What you’ll need:

Milwaukee pH600
Calibration solution MA9007

Calibration Steps:

Turn on the pH meter by switching the ON/OFF button.
Remove the protective cap.
Immerse the electrode in the pH 7.01 calibration solution (MA9007) and wait for the reading to stabilize.

How to Install and Configure Redis on a Separate DigitalOcean Droplet for Magento

Thu, 23 Jan 2025 00:00:00 +0000

Install redis on separate droplet to offload Redis from the Magento monolith.

Create a Droplet for Redis

Let’s create a droplet for Redis in DigitalOcean (DO from now on).

I chose the following minimal parameters (you can scale later):

Basic Droplet
Premium AMD: 1GB RAM, 25GB NVMe SSD, 1000GB transfer.

IMPORTANT: Make sure the new droplet is within the same VPC and Region as your Magento server.

Redis installation

Once the droplet is successfully created, SSH into the droplet and install Redis: