Latest Articles

A memo about purchasing a development board featuring the ESP-WROOM-32 module, which appears when searching for "ESP32" on AliExpress, and has "HW-394" written on the board.

Here is how to open Chrome with a specified window size from the command line on a Mac.

Here is the solution for resolving Input/output errors or Error code -36 that may occur when trying to copy files to an RP2040 microcontroller board or Raspberry Pi Pico while developing on Mac OS Sonoma.

Fix `symbol not found in flat namespace '_mysql_affected_rows'` when importing MySQLdb in Python — rebuild mysqlclient against the right MySQL client library.

Here's an overview in English: How to change the user of an already established session using the Django shell. Please do not attempt this in a production environment as it can be dangerous.

If within the same namespace, name resolution can be performed using the metadata.name of the Service.

If you encounter the error "no matches for kind 'CronJob' in version 'batch/v1beta1'" when registering a Kubernetes CronJob, you can resolve it by changing batch/v1beta1 to batch/v1.

This article covers how to handle error messages related to server certificate expiration when attempting to operate Microk8s (Kubernetes).

Extend an LVM Logical Volume to absorb all remaining free space — `lvextend -l +100%FREE` and the resize2fs / xfs_growfs follow-up.

Here is an example of using Django's template language to check if a logged-in user has permissions for a model. The template variable `perms` is available by default, and you can use it to make this determination.

When processing redundant items one by one in sequence, to ensure not to process everything at once, you can use a sleep function after the second loop iteration and onwards.

When compiling a Python C extension (.pyd / .so) fails due to a Python version mismatch, how to detect and switch to a compatible interpreter.

When `docker run -it` over an `ssh` connection errors `the input device is not a TTY`, drop `-t` or invoke ssh with `-t` to allocate a TTY.

Assigning Version Numbers Using Commit Counts for Simplicity

Use the host SSH key in Docker build to access private repos. Combine `DOCKER_BUILDKIT=1` and `--mount=type=ssh` with `StrictHostKeyChecking=no`.

When setting or retrieving the auto_increment value for a table in MySQL, starting from MySQL 8, information_schema is cached. As a result, retrieving AUTO_INCREMENT consecutively may yield outdated values. This article discusses countermeasures for such situations.

Build a Chromium kiosk for web signage on an OrangePi Zero 2W — OS install, Wayland setup, and auto-start configuration.

When you encounter the error "library not found for -lzlib" while trying to run `pip install mysqlclient` on an M2 Mac, setting the environment variables `MYSQLCLIENT_LDFLAGS` and `MYSQLCLIENT_CFLAGS` can help resolve the issue.

Run a web signage kiosk on a Raspberry Pi with Playwright + Chromium — Python script and systemd unit example.

Due to changes in Twitter's developer program specifications, only one app is allowed under the free plan. If you have multiple API accounts, they will be forcibly disabled (with the API accounts entering a SUSPENDED status). Here are the methods to address this situation.