Tutorial by Examples: t

When you get a working registry running you can pull or push images on it. For that you need the server.crt file into a special folder on your docker client. The certificate allows you to authenticate with the registry, and then encrypt communication. Copy server.crt from registry machine into /etc...

The continue statement in Objective-C programming language works somewhat like the break statement. Instead of forcing termination, however, continue forces the next iteration of the loop to take place, skipping any code in between. For the for loop, continue statement causes the conditional test a...

import socket import hashlib import os import time import itertools import threading import sys import Crypto.Cipher.AES as AES from Crypto.PublicKey import RSA from CryptoPlus.Cipher import IDEA #server address and port number input from admin host= raw_input("Server Address - &gt...

import time import socket import threading import hashlib import itertools import sys from Crypto import Random from Crypto.PublicKey import RSA from CryptoPlus.Cipher import IDEA #animating loading done = False def animate(): for c in itertools.cycle(['....','.......','..........'...

There are specific scenarios where in we might need to create a Quartz scheduler,based on user input on when a scheduler should be triggered,apart from we can handle cases,where we have certain pre-defined functionalities,which need to be triggered based on user action,at a certain period. This exa...

Especially in a ListView, you can run into performance problems by doing too many findViewById() calls during scrolling. By using the ViewHolder pattern, you can save these lookups and improve your ListView performance. If your list item contains a single TextView, create a ViewHolder class to stor...

Our openstack tenant is already set: a virtual lan gives instances private IP a virtual router map public IP to private IP a security key has been generated we have default firewall configuration for ssh and port 80 we are able to launch an instance thanks to the OpenStack web interface ...

Let use 'os_server' command from module 'Cloud' [http://docs.ansible.com/ansible/os_server_module.html]. Variables are defined in ./group_vars/all. $vi launch_compute.yml - name: launch a compute instance hosts: localhost gather_facts: False tasks: - name: Create and launch the VM ...

Use the 'os_server_facts' command from module 'Cloud' [http://docs.ansible.com/ansible/os_server_module.html]. Variables are defined in ./group_vars/all and the instance name is in server: "MyOwnPersonalInstance". $vi get_compute_info.yml - name: Get and print instance IP hosts: loca...

Instead of printing all the informations, we print only IP address of the first instance whose name is "MyOwnPersonalInstance". It's usually all we need. $vi get_compute_ip.yml - name: Get and print instance IP hosts: localhost gather_facts: False tasks: - name: Get VM infos...

To delete our instance, reuse the os_server command with all authentication information and simply replace ' state: present' by ' state: absent'. $vi stop_compute.yml - name: launch a compute instance hosts: localhost gather_facts: False tasks: - name: Create and launch the VM os_...

send() is used to pass message to object. send() is an instance method of the Object class. The first argument in send() is the message that you're sending to the object - that is, the name of a method. It could be string or symbol but symbols are preferred. Then arguments those need to pass in met...

This guide is explicitly for PostgreSQL 9.1 or higher on linux machines. It uses the postgres extensions-feature that will greatly improve the import of extensions to an existing postgres-installation. If you have to work with an older version of postgres, please refer to the official documentations...

To create a new empty database, run as postgres-user: createdb [yourdatabase] Connect to the database with a psql-session: psql -d [yourdatabase] In the psql-session run: CREATE EXTENSION postgis; CREATE EXTENSION postgis_topology; to create the neccesary geospatial extensions. Once thi...

The Laravel framework has a few system requirements. Of course, all of these requirements are satisfied by the Laravel Homestead virtual machine, so it's highly recommended that you use Homestead as your local Laravel development environment. However, if you are not using Homestead, you will need t...

If you have PHP installed locally and you would like to use PHP's built-in development server to serve your application, you may use the serve Artisan command. This command will start a development server at http://localhost:8000: php artisan serve Of course, more robust local development option...

The basic example Open routes/web.php file and paste the following code in file: Route::get('helloworld', function () { return '<h1>Hello World</h1>'; }); here 'helloworld' will act as page name you want to access, and if you don't want to create blade file and still want to ...

Bullet This one particularly blew my mind. The bullet gem helps you kill all the N+1 queries, as well as unnecessarily eager loaded relations. Once you install it and start visiting various routes in development, alert boxes with warnings indicating database queries that need to be optimized will p...

In this example we will set up a geospatial database, import data from 2 different sources, and view the results in an application called QGIS. This guide is explicitly written for linux-machines, if you operate on another platform, some commands or paths might not work as expected. In order to vie...

Backreferences "Backreferences" are references in a search regex to capture groups in the same search regex. The "search regex" is the regex used in the "Find" field of the Find/Replace dialog box. Here is the most common backreference syntax: Absolute: (group one)...