Introduction to Containers w/ Docker, Kubernetes & OpenShift, Module 1: Containers and Containerization

https://docs.google.com/document/d/1LJi_RsDTZJ196pkxBzMh6fEIV4sxSzNTuQFL7xXpfTw/edit?tab=t.rp48rl6enokl

What’s cloud-native?

application always in a cloud from start

What are upsides of cloud-native applications?

often scalable/resilient, easy to update

What do cloud-native applications use?

• containers

• microservices

• managed cloud services

What does cloud refer to (in computing)?

a big network of remote servers globally used to store/manage data IO local servers/PCs

What’s a remote server?

computer system housed in a professional data center

Define “scalable”?

grow/handle works easily without breaking

Define “dynamic”?

everchanging, adaptive, flexible

What’s a hybrid cloud-friendly software?

software working in both private and public cloud environments

What’s a container (in computing)?

isolated software package with anything to run an application, (e.g. code, libraries, system tools)

What’s 1 crucial thing in cloud-native’s approach?

containers

Define “standardization”?

to create/use consistent rules for things to be similar

What improves shipping efficiency a bit?

standardization

Define “logistic”?

to manage how resources are acquired/stored/transported elsewhere

Define “dependency” (in softwares)?

external libraries/tools programs use to work properly

What’s a digital container technology?

a way to package software and its dependencies into containers

What are containerization softwares

software creates/runs containers with their dependencies to run consistently anywhere

Define “encapsulate”.

to wrap/contain

Define “blocker” (in software engineering).

issue/factor blocking developper

What’s a staging environment?

(or just staging) final testing environment that exactly act as production environment for prior launch

What’s a production environment/”prod”/live stage?

"live" stage where product or application actually accessible to users

In traditional environments, we can’t?

isolate apps, allocate memories for apps on physical servers.

What environment is this depicting?
“In traditional environments, we can’t isolate apps, allocate memories for apps on physical servers.”

Traditional Deployment or Bare Metal server

What’s a Traditional Deployment?

old way to install applications directly to physical servers

What happens if servers are often underused?

poor investment return

What’s a investment return?

(investment in servers/IT infrastructure): companies buy to maintain servers, but if they aren’t used much = low investment return

What do Traditional deployments need make it a downside.

hardware, time, money, personnel and costly maintenance

Are Tradiational deployments

unportable in many environments and operating systems

What’s a operating systems?

software supporting device basic functions (e.g. scheduling tasks, executing applications)

What’s a container engine?

(like Docker) software running containers in system

Define “to virtualize”.

to create a thing’s virtual version IO physical

T or F? Container engines virtualize operating system.

T

What are a platform-independent container’s upsides?

• fast

• isolated

• portable

• secure

• need less memory space

Being _________________, they can run on Windows, Linux, or Mac OS.

Being platform-independent, they can run on Windows, Linux, or Mac OS.

How can containers help us?

• quickly make applications

• less deployment time/costs

• better resource utilization (CPU, memory)

• deploy code in applications

What issues of containers?

• Server security is issue if its operating system is affected.

• maybe overwhelmed by many containers

• converting monolithic legacy applications can be

• Developers can struggle right-sizing containers for certain scenarios.

What are popular container vendors today?

• Docker: robust platform, most used container platform

• Podman: daemonless container engine more secure than Docker

• daemonless: software not need constant background run service (daemon) to manage containers

• LXC: preferred by developers for data-intensive applications

• Vagrant: highest isolation lvl on running physical machine

Define “daemonless“.

software not needing constant background run service (daemon) to manage

Define “daemon“.

constant background run to handle tasks