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Creating a Docker network

docker network create app-backend This command will create a simple bridged network called appBackend. No containers are attached to this network by default.

Docker • Docker network

docker network connect app-backend myAwesomeApp-1 This command attaches the myAwesomeApp-1 container to the app-backend network. When you add a container to a user-defined network, the embedded DNS resolver (which is not a full-featured DNS server, and is not exportable) allows each container on ...

Docker • Docker network

Remove a Docker network

docker network rm app-backend This command removes the user-defined app-backend network from the Docker host. All containers on the network not otherwise connected via another network will lose communication with other containers. It is not possible to remove the default bridge bridge network, th...

Docker • Docker network

Inspect a Docker network

docker network inspect app-backend This command will output details about the app-backend network. The of the output of this command should look similar to: [ { "Name": "foo", "Id": "a0349d78c8fd7c16f5940bdbaf1adec8d8399b8309b2e8a969bd4e...

Docker • Docker network

Creating a data volume

docker run -d --name "mysql-1" -v "/var/lib/mysql" mysql This command creates a new container from the mysql image. It also creates a new data volume, which it then mounts in the container at /var/lib/mysql. This volume helps any data inside of it persist beyond the lifetime o...

Docker • Data Volumes and Data Containers

Create a Docker machine

Using docker-machine is the best method to install Docker on a machine. It will automatically apply the best security settings available, including generating a unique pair of SSL certificates for mutual authentication and SSH keys. To create a local machine using Virtualbox: docker-machine create...

Docker • Docker Machine

Upgrade a Docker Machine

Upgrading a docker machine implies a downtime and may require planing. To upgrade a docker machine, run: docker-machine upgrade docker-machine-name This command does not have options

Docker • Docker Machine

Saving and loading Docker images

docker save -o ubuntu.latest.tar ubuntu:latest This command will save the ubuntu:latest image as a tarball archive in the current directory with the name ubuntu.latest.tar. This tarball archive can then be moved to another host, for example using rsync, or archived in storage. Once the tarball h...

Docker • Managing images

Testing against a date range

Although it is very tempting to use BETWEEN ... AND ... for a date range, it is problematical. Instead, this pattern avoids most problems: WHERE x >= '2016-02-25' AND x < '2016-02-25' + INTERVAL 5 DAY Advantages: BETWEEN is 'inclusive' thereby including the final date or second. 2...

MySQL • Date and Time Operations

Generating a Date Range With a Tally Table

Another way you can generate a range of dates is by utilizing a Tally Table to create the dates between the range: Declare @FromDate Date = '2014-04-21', @ToDate Date = '2014-05-02' ;With E1(N) As (Select 1 From (Values (1), (1), (1), (1), (1), (1), (1), (1), (1), (1)) DT...

Microsoft SQL Server • Generating a range of dates

quadraticCurveTo (a path command)

context.quadraticCurveTo(controlX, controlY, endingX, endingY) Draws a quadratic curve starting at the current pen location to a given ending coordinate. Another given control coordinate determines the shape (curviness) of the curve. <!doctype html> <html> <head> <style...

html5-canvas • Path (Syntax only)

Loading default configuration

To read default configuration properties: package com.example; public class ExampleApplication { private Properties getDefaults() throws IOException { Properties defaults = new Properties(); try (InputStream defaultsStream = ExampleApplication.class.getResou...

Java Language • Resources (on classpath)

Adding a metadata endpoint to your service

SOAP services can publish metadata that describes the methods that may be invoked by clients. Clients can use tools such as Visual Studio to automatically generate code (known as client proxies). The proxies hide the complexity of invoking a service. To invoke a service, one merely invokes a metho...

wcf • Your first service

Reading a file into a container

In the example below we use std::string and operator>> to read items from the file. std::ifstream file("file3.txt"); std::vector<std::string> v; std::string s; while(file >> s) // keep reading until we run out { v.push_back(s); ...

C++ • File I/O

Reading a `struct` from a formatted text file.

C++11 struct info_type { std::string name; int age; float height; // we define an overload of operator>> as a friend function which // gives in privileged access to private data members friend std::istream& operator>>(std::istream& is, info_...

C++ • File I/O

Operator Overloading

Needs editing.

Visual Basic .NET Language • Operators

Using Option Instead of Null

In Java (and other languages), using null is a common way of indicating that there is no value attached to a reference variable. In Scala, using Option is preferred over using null. Option wraps values that might be null. None is a subclass of Option wrapping a null reference. Some is a subclass of...

Scala Language • Option Class

Shaded Plots

Shaded region below a line import matplotlib.pyplot as plt # Data x = [0,1,2,3,4,5,6,7,8,9] y1 = [10,20,40,55,58,55,50,40,20,10] # Shade the area between y1 and line y=0 plt.fill_between(x, y1, 0, facecolor="orange", # The fill color color='...

matplotlib • Basic Plots

Member Function cv-qualifier Overloading

Functions within a class can be overloaded for when they are accessed through a cv-qualified reference to that class; this is most commonly used to overload for const, but can be used to overload for volatile and const volatile, too. This is because all non-static member functions take this as a hi...

C++ • Function Overloading

Wait for DOM to be loaded

Use DOMContentLoaded when the <script> code interacting with DOM is included in the <head> section. If not wrapped inside the DOMContentLoaded callback, the code will throw errors like Cannot read something of null document.addEventListener('DOMContentLoaded', function(event) { ...

DOM • Getting started with DOM