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Showing posts from May, 2018

Manage Kestrel process with systemd

Manage Kestrel process with systemdKestrel is a lightweight standalone process. In order to host it on Linux, the recommended approach is to install it as a service. Systemd is a group of tools providing functionalities to manage processes on Ubuntu.
Today we will see how we can manage an ASP NET Core application together with its Kestrel process using systemd tools. This post will be composed of three parts:IntroductionManaging process with systemctlDebugging using journalctl1. IntroductionASP NET Core application runs on top of Kestrel which is a lightweight standalone webserver.
To be able to start to interact with our Ubuntu server we need to first establish an ssh connection. If you aren’t familiar with ssh, you can refer to my previous blog post where I provide explanations on how to setup ssh.Once we are on the server, we can get our libraries on the server and run:/usr/share/dotnet/dotnet myapp.dll This will run the app from the current session. When we exit the session, the a…

Useful bash and friends commands

Useful bash and friends commandsSince I have installed Ubuntu as a subsystem, I see myself using more and more bash. The reason being that all the VMs I spin up are Ubuntu VMs. My interactions with my servers are very basic but even for those, there are many beautiful commands which ease my interactions. Today I would like to go through the commands and tips which I use on a daily basis:sshscpaliaseslessgrep1. ssh1.1 Remote actionsThe ssh command allows us to remotly access a terminal or to execute commands remotly.For example when we create a new EC2 instance on AWS we can download the private key.
This key can be used to ssh into the vm.ssh -i key.pem user:hostname -i is used to indicate the identity file to use. You might need to change the permissions on the file before it can be used with chmod 700 key.pem.It is also possible, to make life easier, to setup ssh to autodetect the private key file to use based on the host we are trying to access.We can achieve that by placing the ke…

ASP NET Core Client-side libraries management with VS 2017 Library Manager

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ASP NET Core Client-side libraries management with VS 2017 Library ManagerFew weeks ago I discussed how we could create a healthchek library which would return json status of our application. Using the json, I wanted to make a quick page to display healthchecks in a nice visual. I wanted to quickly add Bootstrap and momentJS. For frontend libraries, I was used to use Bower as it nicely put every frontend package in /bower_components which can be served as static data. But since Bower was announcing that it was no longer supported and requested to use Yarn or NPM, I started to look around for an easier solution than those as I don’t really care about source code of the frontend libraries, all I want is the latest compiled versions. After few minutes of research, I found out that the team in Microsoft felt the same way as I did and already worked on a tool called Library manager (libman) and is available in VS Preview for the moment. Libman gives the benefit to allow developers to downl…

Async pipe versus Subscribe in Angular

Async pipe versus Subscribe in AngularOver the past year, working in companies using Angular, many times have I been in situations where I was asked to explain the differences between async pipe and .subscribe in Angular.More precisely explain my standpoint which is to always use async pipe when possible and only use .subscribe when side effect is an absolute necessity.The challenge in explaining this comes to how to convince without giving an hour boring lesson of why side effects in logic are hard to maintain and how prematured .subscribe forces developers to make unecessary side effects.So today I would like to talk about that and provide explanations which I hope will help to understand which to use. This post will be composed of three parts:Observable and RxjsSubscribe functionAsync pipeBest practices1. Observable ans RxJSFirst to understand the context, we need to understand what is an observable.1.1 ObservableObservable is an abstraction of asynchronous stream of data.
For exam…