Whenever is a Ruby gem that provides a nicer syntax for writing and deploying cron jobs. Leading zeros are important for whenever if you use the 24-hours format!
Due to network or hardware failures, it can happen that one of your cronjobs will not run at the time...
Whenever requires you to set the application attribute in your Capistrano configuration. Otherwise your cronjobs are created multiple times. Example entry in config/deploy.rb: set :application, 'some-app' # allows "set :whenever...
...work as expected Good Then the crontab -l output will look like this: # Begin Whenever generated tasks for: some-app_staging 34 23 * * * /bin/bash -l -c 'cd /var/www/some-app_staging/releases/20201215171150 && RAILS_ENV...
We use the whenever gem to automatically update the crontab of the servers we deploy to. By default, whenever will update all servers with a matching role (we use the...
...cron output like this (no changes will be made to your crontab): bundle exec whenever --set environment=staging bundle exec whenever --set environment=production Installing jobs only for a given...
...longer maintained and does not work on Rails 3.2+. We will instead use the whenever gem. "Whenever" works just like "craken", by putting your rake tasks into the server's...
...Everything seems to work just like we need it. Installation for new projects Add "whenever" to your Gemfile: group :deploy do gem 'whenever', require: false end Add it to your...
...the file is locked, you can add -n: flock /tmp/my.task.lock -n -c "bin/my-long-running-job" Using whenever, and since this was a rake task, the following did the trick: job_type :exclusive...
If you'd like to preview the crontab that whenever will deploy, run the following: bundle exec whenever This will print the cron syntax without modifying your local crontab...
If you're supporting IE9+, you can listen to input to see if a text field changes. Other than change...
In whenever you can schedule Ruby code directly like so: every 1.day, :at => '4:30 am' do runner "MyModel.task_to_run_at_four_thirty_in_the_morning" end
...you can test, this is probably preferable to defining additional Rake tasks. Unfortunately when whenever register a runner command, it doesn't use bundle exec in the resulting crontab. This...
...should be setup in a way that it sets a faraway cache expiry date whenever it delivers a hashed asset. However, if you want Rails to generate these magic hashed...
...asset_path if you need the raw asset hashed paths without an HTML tag. Whenever you don't pipe an asset path through a Rails helper, you don't get...
Our two main mechanisms for background processing are cronjobs (managed with whenever) job queues, usually with Sidekiq Learn about cronjobs Read HowTo: Add Jobs To cron Under...
Understand how we manage cronjobs with whenever. Find a project that uses whenever. Find out what kinds of work is done in those cronjobs. Can you find...
...must always run on all servers. E.g. starting a sidekiq process on reboot. Configuring whenever If not configured otherwise, cronjobs defined in whenever's schedule.rb will only be written to...
...should run on all servers, you will have to change the default setting of whenever_roles. What works well for us is using the roles cron and primary_cron:
...basename `pwd`)\a" Bash To make your Bash automatically update your window title whenever you switch directories, simply specify a PROMPT_COMMAND environment variable. set-window-title() {
...a new terminal window. ZSH To make your Bash automatically update your window title whenever you switch directories, add the following line to your precmd function in the ~/.zshrc. In...
.element color: red transition: color .1s &:hover color: green This tells the browser "whenever the color of an .element changes, let it take 1/10th of a second" and next...
...whenever an .element is hovered, make its text green". Multiple animated properties are comma-separated: .element color: red opacity: .9 transition: color .1s, opacity .3s &:hover color: green
You have the following HTML structure:
If you want to run Javascript code whenever someone clicks on a ...
..., you can do this in three different ways: function code(event...
...the game is to click on the currently visible mole as fast as possible. Whenever the user clicks within the arena, the moles are randomly hidden or shown.
...spec ensures no package manager is accidentally skipped (especially in the fragile Bower integration). Whenever a library with an unapproved (or restricted) license is added to the project, the second...
...to the server, putting cookies into three different classes: SameSite=None Send the cookie whenever a request is made to the cookie domain, be it cross-origin or on the...
...rolled back, and the exception is re-raised. When should I use a transaction? Whenever you make an operation that affects more than a single database row, you should always...
By default, Rails views escape HTML in any strings you insert. If you want to insert HTML verbatim, you need...
...caching logic (that deals with the response) to care about differences in these headers whenever a request comes in and to cache dependent on the concrete value of these headers...
...Float, it is very easy for Float values to creep back into your code. Whenever you mix Floats with BigDecimals, the result will be a Float. A common mistake is...
...we simply log into the production server's SQL console and alter tables there whenever we need a change? How do we need to work with migrations when we change...
...exercise, please don't use the :counter_cache option and do everything manually instead. Whenever you add a new column you need to take care of existing records. Add a...
...parallel with little to no synchronization to prevent race conditions. A race condition occurs whenever the test script makes unchecked assumptions about the browser's application state. The test above...
...You don't need to keep track of that, you'll just get them whenever you update your bundled packages...