Category Archives: Development tools

Docker and Kubernetes basics for developers

Docker Docker containers are much more lightweight compared to classic VMs as they leverage host OS instead of starting their own OS. Containers are using 2 features of Linux-based OS: Namespaces and Cgroups (Control Groups). Namespace Lets you allocate resources in an isolated environment (like a sandbox). On a container start, docker daemon generates a …

Fast and simple mock server app by swagger file

I’ve tried Mockoon for mocking by swagger/OpenAPI spec file, and it works pretty good. It autogenerates the response based on swagger format, and you are able to update any response field the way you want, save your changes and run the mock server with one click on the port you specify. It is a separate …

Using tcpdump for k8s pods

You need wireshark to be installed on your local machine — download (more on this below). If you don’t have tcpdump installed inside the pod, you can install it with

# get pod name
kubectl get po -Lversion,cfg,infra-cfg -lapp=<pod-tag>
kubectl exec -it <pod-name> sh
# inside the pod, alpine
apk add tcpdump

# get pod name

kubectl get po -Lversion,cfg,infra-cfg -lapp=<pod-tag>

kubectl exec -it <pod-name> sh

# inside the pod, alpine

apk add tcpdump

Then, on your local machine:

kubectl exec <pod-name> -- tcpdump -i eth0 -w - | wireshark -k -i -

1	kubectl exec <pod-name> -- tcpdump -i eth0 -w - \| wireshark -k -i -

If you want to see packets in grpc/http2, you can add a rule in Wireshark. For this, click …

Use brew cask to install software on MacOS

That’s the way to automate your favorite apps installed on a new machine with one command and a config file. https://github.com/Homebrew/homebrew-cask. You can either install apps manually with a command like brew cask install goland or install all your apps by provided config. One downside is that it has a limited list of apps supported …

Interesting alternative to grpc_cli

https://github.com/ktr0731/evans It has REPL mode and CLI mode for e2e tests I think, it could be a good alternative to grpc_cli.

Debugging site in chrome from android device

Download platform tools from here — https://developer.android.com/studio/releases/platform-tools.html. Run ADB with command

./adb start-server
# when you finished, stop it with
# ./adb kill-server

./adb start-server

# when you finished, stop it with

# ./adb kill-server

Configure your phone according to this article — https://developer.android.com/studio/debug/dev-options.html (for my specific it is https://www.syncios.com/android/how-to-debug-xiaomi-mi-max-mix.html). Connect your phone to the computer with USB cable. Follow instructions from here — https://developers.google.com/web/tools/chrome-devtools/remote-debugging. When finished, stop ADB and turn off all the developer features on your …

env-file parser for Goland

You can use env-file parser for running and debugging your app in Jetbrains’ products like Goland. It’s pretty simple and works. https://github.com/Ashald/EnvFile

Simple online editor for javascript

Just paste it into navigation bar:

data:text/html, <html><script>window.onbeforeunload = window.onunload = function(){return 'Confirm page reload';};</script><body><button onclick="console.log(eval(document.querySelector('textarea').value.replace('<div>', '\n').replace('</div>', '\n')))">run</button><br><textarea style="width:600px;height:400px"></textarea></body><script>document.querySelector('textarea').focus();</script>

data:text/html, <html><script>window.onbeforeunload = window.onunload = function(){return 'Confirm page reload';};</script><body><button onclick="console.log(eval(document.querySelector('textarea').value.replace('<div>', '\n').replace('</div>', '\n')))">run</button><br><textarea style="width:600px;height:400px"></textarea></body><script>document.querySelector('textarea').focus();</script>

It just outputs the result into console when you click run button. It’s simple and works. Because sometimes you just don’t need monsters like jsfiddle or jsbin.

PlantUML — плагин для Jetbrains IDEA для рисования UML диаграмм

PlantUML — плагин для Jetbrains IDEA для рисования UML диаграмм. У них есть сайт, хоть и странный — http://plantuml.com/. Сложные диаграммки рисовать очень неудобно, но простые делаются кодом навроде этого:

Bob->Alice : hello

1	Bob->Alice : hello

Диаграммы C4 model (c4model): https://c4model.com/ Level 1: A System Context diagram provides a starting point, showing how the software system in scope fits into the world …

collabedit для совместного редактирования кода

Удобно для проведения технического собеседования. http://collabedit.com/