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Avoid `table already exists` failures in Django tests when running with `--keepdb` after cancelling migrations — how to forcibly reset the test DB migration state.
Django: Best way to unit-test an abstract model - Stack Overflowhttps://stackoverflow.com/questions/4281670/django-best-way-to-unit-test-an-abstract-model
Use a lambda callback with Python's `re.sub` to replace only a captured group (e.g. a version number) inside a larger pattern.
MultiViews is enabled
When you start samba-ad-dc using the command `$ sudo systemctl start samba-ad-dc`, and check either /var/log/samba/log.smbd or /var/log/samba/%m, it appears that port 53 is unavailable.
Apache suddenly crashes, and upon checking the logs, I found the following messages: "AH00050: Child 7815 returned a Fatal error... Apache is exiting!" and "AH02818: MPM run failed, exiting."
When `do-release-upgrade` to Ubuntu 18.04 hangs on libnih1 or upstart packages, here is how to unstick and complete the release upgrade.
Strip 4-byte characters (emoji, some kanji) from a Python 3 `requests` response — useful when storing into MySQL utf8 (3-byte) columns.
If `python3.6 -m venv venv` fails on Ubuntu, the `python3.6-venv` package is missing — install it via apt to enable virtual environment creation.
One-liner to count upgradable packages with `apt list --upgradable`, plus a shell script to surface the number in the MOTD login banner.
If the volume mounted with Goofys is not visible to other users
When you download a CSV from Amazon, it might sometimes be a TSV with a BOM.
Notes on installing OpenVPN on an Ubuntu server and setting up a site-to-site VPN.
1. If the certificate is in DER format, convert it to PEM
※ This does not mean creating constraints in an RDB. It simply means creating a ForeignKey field that works for now.
sudo bash -c "curl -kL https://bootstrap.pypa.io/get-pip.py | python"
How to Create a Shared Folder That Can Be Accessed by Anyone Without Authentication.
Make Django's `request.build_absolute_uri()` return HTTPS behind Apache + ELB — `USE_X_FORWARDED_HOST` and `SECURE_PROXY_SSL_HEADER` settings.
<Error><Message>Please provide valid credentials. Bearer realm="yahooapis.jp", error="insufficient_scope", error_description="insufficient scope"</Message></Error> I encountered the above error when using Yahoo's Store API.
A complete Ansible playbook to install Docker CE on Ubuntu 16.04 — apt key, repository registration, and the docker-ce package install in one playbook.