Some questions about the microservice.

n00b_noob · 04-28-2021, 03:37 AM

Hello,
According to the Red Hat and Google:

Quote:

Linux containers give your microservice-based apps an ideal application deployment unit and self-contained execution environment. With microservices in containers, it's easier to take advantage of hardware and easily orchestrate services, including storage, networking, and security.

And:

Quote:

Microservice architecture – a variant of the service-oriented architecture structural style – arranges an application as a collection of loosely coupled services. In a microservices architecture, services are fine-grained and the protocols are lightweight.

My questions are:

1- Why some administrators prefer microservices?

2- Microservices are applications that running in a container? For example, an Apache Web Server that running inside a container like Docker.

3- Is Unikernel something like the microservice?

Thank you.

TenTenths · 04-28-2021, 09:01 AM

Quote:

Originally Posted by n00b_noob

1- Why some administrators prefer microservices?

Not necessarily anything to do with administrations, sometimes admins just implement what architects design. However, key points would include:

Allow segregation of services without the overhead of a full O/S install for each service.
Allows better resource utilization by allowing multiple segregated services to run on a single "host"
Containers for a given containerization platform are (generally) host agnostic

Quote:

Originally Posted by n00b_noob

2- Microservices are applications that running in a container? For example, an Apache Web Server that running inside a container like Docker.

Essentially yes

berndbausch · 04-28-2021, 10:20 AM

Quote:

Originally Posted by n00b_noob

1- Why some administrators prefer microservices?

I don't know if admins prefer them, but in my opinion, they exist mostly for scalability and elasticity.

Quote:

2- Microservices are applications that running in a container? For example, an Apache Web Server that running inside a container like Docker.

Probably not a requirement, but something like Kubernetes makes them easy to manage and, again, scale up and down.

pan64 · 04-28-2021, 10:25 AM

Quote:

Originally Posted by n00b_noob

3- Is Unikernel something like the microservice?

No. See for example wiki: https://en.wikipedia.org/wiki/Unikernel

Unikernels lend themselves to creating systems that follow the service-oriented or microservices software architectures.

n00b_noob · 05-01-2021, 11:18 AM

Thank you.
I have other questions:

1- If I install an Apache Web Server in the Docker, then I created a Microservice? If no, can anyone show me a tutorial about it?

2- In Microservice design, each Docker container just has to run one application? For example, a website need a database and for its database I need another Docker container that running MySQL?