1598002740
Converged Platform for VM’s and Containers? Journey to KubeVirt!
Before jumping into the details of KubeVirt, let’s understand the need for such tools. I would like to touch two such scenarios that would need KubeVirt.
Firstly, let’s take a case where you split the monolith architecture based project into microservices. In this case, as a practice, we would not split monolith into microservices at one go! We would gradually reach by doing a few services per iteration. So, you get two variants of deployable images that need two different platforms. i.e. To run the existing monolith based VM’s into some kind of virtualization management environments. Then you need container orchestrator tools like Kubernetes to deploy your extracted services of your Microservices.
Secondly, let’s take a case where containerization is not possible in the near future for your project functionality, e.g. some virtual network functions (VNF) like a load balancer, gateway but we plan to build some containers to manage or orchestrate the VNF that we would need. Here too, we would need two platforms to deploy the projects.
In both of these scenarios, the common problem would have cost, and skill set. You would need to spend money on two different platforms (if you choose to go with enterprise editions of vSphere and Kubernetes probably). Then you would need specialized resources in both of these platforms. In some cases, the team would find it difficult to adopt two different platforms and cause some flexibility issues. What if we could deploy and manage VMs into Kubernetes? Sounds great, right! That gives valuable time to concentrate on project functionalities, rather than spending time on understanding the platform where it runs. To address these needs, KubeVirt comes as a rescuer.
“KubeVirt_ is the open-source project that makes it possible to run virtual machines in a Kubernetes managed container platform. KubeVirt delivers container-native virtualization by leveraging KVM, the Linux Kernel hypervisor, within a Kubernetes container.” — from RedHat._
Converged Platform: Containers + VMs
Let’s walk through the process of spinning up a VM inside a Kubernetes platform. I assume that you have already deployed Kubernetes in your environment. To deploy VMs into the Kubernetes, you would need the KubeVirt specific pods installed on your Kubernetes platform. Such as,
- KubeVirt Operator related pods
- KubeVirt Custom Resources (CRD’s)
- CDI Operator [this is used to upload VM image into your Kubernetes persistent volumes]
- CDI Custom Resources (CRD’s) [instead of CDI you can upload directly using ‘virtctl’ command]
#kubernetes #kubevirt #containers #convergence #virtual-machine
What is GEEK
Buddha Community
1598002740
Converged Platform for VM’s and Containers? Journey to KubeVirt!
Before jumping into the details of KubeVirt, let’s understand the need for such tools. I would like to touch two such scenarios that would need KubeVirt.
Firstly, let’s take a case where you split the monolith architecture based project into microservices. In this case, as a practice, we would not split monolith into microservices at one go! We would gradually reach by doing a few services per iteration. So, you get two variants of deployable images that need two different platforms. i.e. To run the existing monolith based VM’s into some kind of virtualization management environments. Then you need container orchestrator tools like Kubernetes to deploy your extracted services of your Microservices.
Secondly, let’s take a case where containerization is not possible in the near future for your project functionality, e.g. some virtual network functions (VNF) like a load balancer, gateway but we plan to build some containers to manage or orchestrate the VNF that we would need. Here too, we would need two platforms to deploy the projects.
In both of these scenarios, the common problem would have cost, and skill set. You would need to spend money on two different platforms (if you choose to go with enterprise editions of vSphere and Kubernetes probably). Then you would need specialized resources in both of these platforms. In some cases, the team would find it difficult to adopt two different platforms and cause some flexibility issues. What if we could deploy and manage VMs into Kubernetes? Sounds great, right! That gives valuable time to concentrate on project functionalities, rather than spending time on understanding the platform where it runs. To address these needs, KubeVirt comes as a rescuer.
“KubeVirt_ is the open-source project that makes it possible to run virtual machines in a Kubernetes managed container platform. KubeVirt delivers container-native virtualization by leveraging KVM, the Linux Kernel hypervisor, within a Kubernetes container.” — from RedHat._
Converged Platform: Containers + VMs
Let’s walk through the process of spinning up a VM inside a Kubernetes platform. I assume that you have already deployed Kubernetes in your environment. To deploy VMs into the Kubernetes, you would need the KubeVirt specific pods installed on your Kubernetes platform. Such as,
- KubeVirt Operator related pods
- KubeVirt Custom Resources (CRD’s)
- CDI Operator [this is used to upload VM image into your Kubernetes persistent volumes]
- CDI Custom Resources (CRD’s) [instead of CDI you can upload directly using ‘virtctl’ command]
#kubernetes #kubevirt #containers #convergence #virtual-machine
1656151740
Test_cov_console: Flutter Console Coverage Test
Flutter Console Coverage Test
This small dart tools is used to generate Flutter Coverage Test report to console
How to install
Add a line like this to your package's pubspec.yaml (and run an implicit flutter pub get):
dev_dependencies:
test_cov_console: ^0.2.2
How to run
run the following command to make sure all flutter library is up-to-date
flutter pub get
Running "flutter pub get" in coverage... 0.5s
run the following command to generate lcov.info on coverage directory
flutter test --coverage
00:02 +1: All tests passed!
run the tool to generate report from lcov.info
flutter pub run test_cov_console
---------------------------------------------|---------|---------|---------|-------------------|
File |% Branch | % Funcs | % Lines | Uncovered Line #s |
---------------------------------------------|---------|---------|---------|-------------------|
lib/src/ | | | | |
print_cov.dart | 100.00 | 100.00 | 88.37 |...,149,205,206,207|
print_cov_constants.dart | 0.00 | 0.00 | 0.00 | no unit testing|
lib/ | | | | |
test_cov_console.dart | 0.00 | 0.00 | 0.00 | no unit testing|
---------------------------------------------|---------|---------|---------|-------------------|
All files with unit testing | 100.00 | 100.00 | 88.37 | |
---------------------------------------------|---------|---------|---------|-------------------|
Optional parameter
If not given a FILE, "coverage/lcov.info" will be used.
-f, --file=<FILE> The target lcov.info file to be reported
-e, --exclude=<STRING1,STRING2,...> A list of contains string for files without unit testing
to be excluded from report
-l, --line It will print Lines & Uncovered Lines only
Branch & Functions coverage percentage will not be printed
-i, --ignore It will not print any file without unit testing
-m, --multi Report from multiple lcov.info files
-c, --csv Output to CSV file
-o, --output=<CSV-FILE> Full path of output CSV file
If not given, "coverage/test_cov_console.csv" will be used
-t, --total Print only the total coverage
Note: it will ignore all other option (if any), except -m
-p, --pass=<MINIMUM> Print only the whether total coverage is passed MINIMUM value or not
If the value >= MINIMUM, it will print PASSED, otherwise FAILED
Note: it will ignore all other option (if any), except -m
-h, --help Show this help
example run the tool with parameters
flutter pub run test_cov_console --file=coverage/lcov.info --exclude=_constants,_mock
---------------------------------------------|---------|---------|---------|-------------------|
File |% Branch | % Funcs | % Lines | Uncovered Line #s |
---------------------------------------------|---------|---------|---------|-------------------|
lib/src/ | | | | |
print_cov.dart | 100.00 | 100.00 | 88.37 |...,149,205,206,207|
lib/ | | | | |
test_cov_console.dart | 0.00 | 0.00 | 0.00 | no unit testing|
---------------------------------------------|---------|---------|---------|-------------------|
All files with unit testing | 100.00 | 100.00 | 88.37 | |
---------------------------------------------|---------|---------|---------|-------------------|
report for multiple lcov.info files (-m, --multi)
It support to run for multiple lcov.info files with the followings directory structures:
1. No root module
<root>/<module_a>
<root>/<module_a>/coverage/lcov.info
<root>/<module_a>/lib/src
<root>/<module_b>
<root>/<module_b>/coverage/lcov.info
<root>/<module_b>/lib/src
...
2. With root module
<root>/coverage/lcov.info
<root>/lib/src
<root>/<module_a>
<root>/<module_a>/coverage/lcov.info
<root>/<module_a>/lib/src
<root>/<module_b>
<root>/<module_b>/coverage/lcov.info
<root>/<module_b>/lib/src
...
You must run test_cov_console on <root> dir, and the report would be grouped by module, here is
the sample output for directory structure 'with root module':
flutter pub run test_cov_console --file=coverage/lcov.info --exclude=_constants,_mock --multi
---------------------------------------------|---------|---------|---------|-------------------|
File |% Branch | % Funcs | % Lines | Uncovered Line #s |
---------------------------------------------|---------|---------|---------|-------------------|
lib/src/ | | | | |
print_cov.dart | 100.00 | 100.00 | 88.37 |...,149,205,206,207|
lib/ | | | | |
test_cov_console.dart | 0.00 | 0.00 | 0.00 | no unit testing|
---------------------------------------------|---------|---------|---------|-------------------|
All files with unit testing | 100.00 | 100.00 | 88.37 | |
---------------------------------------------|---------|---------|---------|-------------------|
---------------------------------------------|---------|---------|---------|-------------------|
File - module_a - |% Branch | % Funcs | % Lines | Uncovered Line #s |
---------------------------------------------|---------|---------|---------|-------------------|
lib/src/ | | | | |
print_cov.dart | 100.00 | 100.00 | 88.37 |...,149,205,206,207|
lib/ | | | | |
test_cov_console.dart | 0.00 | 0.00 | 0.00 | no unit testing|
---------------------------------------------|---------|---------|---------|-------------------|
All files with unit testing | 100.00 | 100.00 | 88.37 | |
---------------------------------------------|---------|---------|---------|-------------------|
---------------------------------------------|---------|---------|---------|-------------------|
File - module_b - |% Branch | % Funcs | % Lines | Uncovered Line #s |
---------------------------------------------|---------|---------|---------|-------------------|
lib/src/ | | | | |
print_cov.dart | 100.00 | 100.00 | 88.37 |...,149,205,206,207|
lib/ | | | | |
test_cov_console.dart | 0.00 | 0.00 | 0.00 | no unit testing|
---------------------------------------------|---------|---------|---------|-------------------|
All files with unit testing | 100.00 | 100.00 | 88.37 | |
---------------------------------------------|---------|---------|---------|-------------------|
Output to CSV file (-c, --csv, -o, --output)
flutter pub run test_cov_console -c --output=coverage/test_coverage.csv
#### sample CSV output file:
File,% Branch,% Funcs,% Lines,Uncovered Line #s
lib/,,,,
test_cov_console.dart,0.00,0.00,0.00,no unit testing
lib/src/,,,,
parser.dart,100.00,100.00,97.22,"97"
parser_constants.dart,100.00,100.00,100.00,""
print_cov.dart,100.00,100.00,82.91,"29,49,51,52,171,174,177,180,183,184,185,186,187,188,279,324,325,387,388,389,390,391,392,393,394,395,398"
print_cov_constants.dart,0.00,0.00,0.00,no unit testing
All files with unit testing,100.00,100.00,86.07,""Installing
Use this package as an executable
Install it
You can install the package from the command line:
dart pub global activate test_cov_consoleUse it
The package has the following executables:
$ test_cov_console
Use this package as a library
Depend on it
Run this command:
With Dart:
$ dart pub add test_cov_consoleWith Flutter:
$ flutter pub add test_cov_consoleThis will add a line like this to your package's pubspec.yaml (and run an implicit dart pub get):
dependencies:
test_cov_console: ^0.2.2Alternatively, your editor might support dart pub get or flutter pub get. Check the docs for your editor to learn more.
Import it
Now in your Dart code, you can use:
import 'package:test_cov_console/test_cov_console.dart';example/lib/main.dart
import 'package:flutter/material.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
// This is the theme of your application.
//
// Try running your application with "flutter run". You'll see the
// application has a blue toolbar. Then, without quitting the app, try
// changing the primarySwatch below to Colors.green and then invoke
// "hot reload" (press "r" in the console where you ran "flutter run",
// or simply save your changes to "hot reload" in a Flutter IDE).
// Notice that the counter didn't reset back to zero; the application
// is not restarted.
primarySwatch: Colors.blue,
// This makes the visual density adapt to the platform that you run
// the app on. For desktop platforms, the controls will be smaller and
// closer together (more dense) than on mobile platforms.
visualDensity: VisualDensity.adaptivePlatformDensity,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key? key, required this.title}) : super(key: key);
// This widget is the home page of your application. It is stateful, meaning
// that it has a State object (defined below) that contains fields that affect
// how it looks.
// This class is the configuration for the state. It holds the values (in this
// case the title) provided by the parent (in this case the App widget) and
// used by the build method of the State. Fields in a Widget subclass are
// always marked "final".
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
int _counter = 0;
void _incrementCounter() {
setState(() {
// This call to setState tells the Flutter framework that something has
// changed in this State, which causes it to rerun the build method below
// so that the display can reflect the updated values. If we changed
// _counter without calling setState(), then the build method would not be
// called again, and so nothing would appear to happen.
_counter++;
});
}
@override
Widget build(BuildContext context) {
// This method is rerun every time setState is called, for instance as done
// by the _incrementCounter method above.
//
// The Flutter framework has been optimized to make rerunning build methods
// fast, so that you can just rebuild anything that needs updating rather
// than having to individually change instances of widgets.
return Scaffold(
appBar: AppBar(
// Here we take the value from the MyHomePage object that was created by
// the App.build method, and use it to set our appbar title.
title: Text(widget.title),
),
body: Center(
// Center is a layout widget. It takes a single child and positions it
// in the middle of the parent.
child: Column(
// Column is also a layout widget. It takes a list of children and
// arranges them vertically. By default, it sizes itself to fit its
// children horizontally, and tries to be as tall as its parent.
//
// Invoke "debug painting" (press "p" in the console, choose the
// "Toggle Debug Paint" action from the Flutter Inspector in Android
// Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
// to see the wireframe for each widget.
//
// Column has various properties to control how it sizes itself and
// how it positions its children. Here we use mainAxisAlignment to
// center the children vertically; the main axis here is the vertical
// axis because Columns are vertical (the cross axis would be
// horizontal).
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text(
'You have pushed the button this many times:',
),
Text(
'$_counter',
style: Theme.of(context).textTheme.headline4,
),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: _incrementCounter,
tooltip: 'Increment',
child: Icon(Icons.add),
), // This trailing comma makes auto-formatting nicer for build methods.
);
}
}Author: DigitalKatalis
Source Code: https://github.com/DigitalKatalis/test_cov_console
License: BSD-3-Clause license
1623323207
Platform App Design | Cross-Platform Development Services
Cross-Platform Development Services
With the development in mobile app technology, a huge time saver as well as the quality maintainer technology is Cross-Platform App development. The development of an app that takes less time to develop as well as uses one technology to develop an app for both android and iOS is game-changing technology in mobile app development.
Want to develop or design a Cross-platform app?
With the successful delivery of more than 950 projects, WebClues Infotech has got the expertise as well as a huge experience of cross-platform app development and design. With global offices in 4 continents and a customer presence in most developed countries, WebClues Infotech has got a huge network around the world.
Want to know more about our cross-platform app designs?
Visit: https://www.webcluesinfotech.com/cross-platform-design/
Share your requirements https://www.webcluesinfotech.com/contact-us/
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#cross-platform development services #cross platform mobile app development services #cross-platform mobile app development services #cross platform app development services #hire cross platform app developer #hire cross-platform app developer india usa,
1620737688
Top Cross-Platform App Developers in USA
Are you looking for the best Cross-Platform app developers in USA? AppClues Infotech has the best expertise to create mobile app on Android & iOS platform. Get in touch with our team for the right Cross-Platform app development solution.
For more info:
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Email: info@appcluesinfotech.com
Call: +1-978-309-9910
#cross-platform app development #cross-platform framework development #cross-platform mobile app development #top cross platform app developers in usa #top cross platform app developers in usa #develop a cross-platform mobile app
1616583098
Cross Platform Mobile App Development Company in USA
AppClues Infotech is a top-notch cross platform mobile app development company in USA. With strong mobile app designers & developers team that help to create powerful cross-platform apps using the current market technologies & functionalities.
For more info:
Website: https://www.appcluesinfotech.com/
Email: info@appcluesinfotech.com
Call: +1-978-309-9910
#cross platform mobile app development company #best cross platform mobile app development #cross platform app development services #top cross platform app development company #cross-platform app development usa #hire cross-platform app developer