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Project structure project/ group_vars/ development inventory.development playbook.yaml These variables will be applied to hosts under the development group due to the filename. --- ## Application app_name: app app_url: app.io web_url: cdn.io app_friendly: New App env_type: ...

If you want to use docker for rails app, and use database, you need to know that all the data in the docker container will be destroyed (unless you configure the container specifically for keeping data) Sometimes, you need to create a docker container with an application and attach it to an old con...

Sometimes users from other regions than English-speaking have problems with encoding while for example programming a php project. It can be, that the server has another encoding then UTF-8, and if someone want to create a php project in UTF-8 on this server, his text might be shown incorrect. Examp...

Let us assume we have the following Series: >>> import pandas as pd >>> s = pd.Series([1, 4, 6, 3, 8, 7, 4, 5]) >>> s 0 1 1 4 2 6 3 3 4 8 5 7 6 4 7 5 dtype: int64 Followings are a few simple things which come handy when you are workin...

You can use Firebase Authentication to let your users authenticate with Firebase using their email addresses and passwords, and to manage your app's password-based accounts. In this example, we use these steps to set it up for our Android project which is based on JavaScript. But before doing so, ...

$rootScope.$on listeners will remain in memory if you navigate to another controller. This will create a memory leak if the controller falls out of scope. Don't angular.module('app').controller('badExampleController', badExample); badExample.$inject = ['$scope', '$rootScope']; function badExam...

Tomcat's Host Manager application by default is located at http://localhost:8080/host-manager, but is not accessible until a user is given permission in the conf/tomcat-users.xml file. The file needs to have: A manager-gui role A user with this role For example: <tomcat-users> ......

Once you have access to the host-manager, the GUI will let you add a virtual host. Note: In Tomcat 7 and 8, adding a virtual host via the GUI does not write the vhost to config files. You will need to manually edit the server.xml file to have the vhost available after a restart. See http://tomc...

2.04 Bash treats some paths as special and can do some network communication by writing to /dev/{udp|tcp}/host/port. Bash cannot setup a listening server, but can initiate a connection, and for TCP can read the results at least. For example, to send a simple web request one could do: exec 3</...

The most common usage of a child theme is to override template parts. For example, a sidebar, if we have a theme with the following file at /themes/template/sidebar.php <?php /** * The sidebar containing the main widget area. * * @link https://developer.wordpress.org/themes/basics/templa...

Steps to reset database in Heroku: 1. Drop the database, when SHARED_DATABASE_URL is used: heroku pg:reset DATABASE 2. Recreate the database with nothing in it: heroku run rake db:migrate 3. Populate the database with your seed data: heroku run rake db:seed Steps 2 and 3 can be combined...

Executing a task with the background worker. Double Click on the BackgroundWorker control from the Toolbox This is how the BackgroundWorker appears after adding it. Double click on the added control to get the BackgroundWorker1_DoWork event and add the code to be executed when the BackgroundW...

You cannot access any GUI components from the BackgroudWorker. For example if you try to do something like this Private Sub BackgroundWorker1_DoWork(sender As Object, e As DoWorkEventArgs) TextBox1.Text = "Done" End Sub you will receive a runtime error saying that "Cross-thr...

<PropertyGroup> <DirectoryToCreate>NewDirectory</DirectoryToCreate> </PropertyGroup> <MakeDir Directories="$(DirectoryToCreate)" />

1) Services A service is a constructor function that is invoked once at runtime with new, just like what we would do with plain javascript with only difference that AngularJs is calling the new behind the scenes. There is one thumb rule to remember in case of services Services are constructors...

This ActionResult returns a Razor view page. Under the standard routing template this ActionResult method would be reached at http://localhost/about/me The View will be looked for automatically in your site at ~/Views/About/Me.cshtml public class AboutController : Controller { public ActionR...

Eclipse debugging starts with what is referred to as Agents. The JVM, which runs the complied .class sources has a feature that allows externally libraries (written in either Java or C++) to be injected into the JVM, just about runtime. These external libraries are referred to as Agents and they ha...

Note: Let's setup some anonymous authentication for the example { "rules": { ".read": "auth != null", ".write": "auth != null" } } Once it is done, create a child by editing your database address. For example: https://your-proje...

public class ReplaceFont { public static void changeDefaultFont(Context context, String oldFont, String assetsFont) { Typeface typeface = Typeface.createFromAsset(context.getAssets(), assetsFont); replaceFont(oldFont, typeface); } private static void replaceFont(String oldFont, Type...

Add the required libraries into the dependencies section of your Android module's build.gradle: android { ... defaultConfig { ... testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner" } } dependencies { ... androidTestCompile 'com.android.su...