I recently noticed that better_errors allows you to to open files from within your favorite editor. However it was...
When you allow file uploads in your app, a user might upload content that hurts other users. Our primary concern...
Every Rails response has a default ETag header. In theory this would enable caching for multiple requests to the same...
When you're using a third party repository on your Ubuntu or Debian system and need to find out which...
tl;dr asdf allows you to manage multiple runtime versions with a single CLI tool and is backwards compatible by...
We recently encountered a problem with GlusterFS (7.x) when an application used the flock syscall on a GlusterFS path...
Capybara has a variety of finder methods like find_button to help you look up DOM elements. There are also...
A lot of web applications require being called over https, which is a good thing. It's possible to configure...
We will achieve this by creating a block accepting method to optionally create and then lock a .lock File of...
In dieser Card machst du einige Übungsaufgaben um Linux Server mit Ansible zu verwalten. Da es vermutlich zu aufwendig ist...
If you use a newer SSH key generated with the ED25519 algorithm instead of RSA (see Create a new SSH...
This is a checklist I use to work on issues. For this purpose I extracted several cards related to the...
Not all email clients support external images in all situations, e.g. an image within a link. In some cases, a...
Carrierwave's BaseUploader can have some validations that you can use by overriding a certain method, which's expected name...
Sometimes I ran across a GitHub merge request of a gem where it was not completely obvious in which version...
In Rails 5+ you can access a helper from a controller using the helpers method: # Inside a controller action
Das Standardtool für Monitoring auf AWS ist Cloudwatch. Du hast dir in den AWS Kapiteln Cloudwatch sicherlich schon grundsätzlich angesehen...
Du verstehst was eine Custom Resource ist und warum das nützlich sein kann. Du weißt, was ein Operator ist...
Du verstehst, warum man Healthchecks u.ä. haben möchte. Du weißt auch, dass solche Checks nicht exklusiv für Kubernetes...
A severe bug was found in ImageMagick by Bryan Gonzalez from Ocelot Team. It allows to embed the content of...
Im Kapitel 502 Eine Applikation als Container mit CI pipelines deployen hast du eine Applikation auf AWS deployed. In diesem...
Du weißt, welcher Linux Service für das starten/stoppen/löschen von Containern zuständig ist. Wie wird die Authentifizierung für Requests...
After upgrading to Rails 6.1.7.2 one of our apps printed a wall of warnings while booting: /var/www/app/shared/bundle/ruby/2.6.0/gems/net-protocol-0.2.1/lib/net/protocol.rb:68: warning: already...
If you want to check the configuration of a running JVM process you can use jcmd. List the running processes...