Components of Docker

a)         Docker daemon – which is the server

b)         Docker Client

c)         Docker Images – Source code for containers

d)         Docker Registries – This is where docker stores images we build. There are private and public registries. The public registry is called docker hub

e)         Docker Container – Is the organizational unit of docker

2. Docker pause suspends all processes in the specified container while Docker unpause un-suspend all processes in the specified containers

3. Docker stop gracefully shut down container while Docker kill immediately stops/terminate containers

4. Docker Exec – executes new command / creates a new process in the container while Docker attach just connects to a running container using the container’s ID or name

5. Dockerfile Instruction – lists of commands a user could call on the command line to assemble an image

6. Entry Point specifies a command that will always be executed when the container starts. On the other hand, CMD defines default commands and/or parameters for a container.

2. DevOps is meant to reduce the friction between development and operation teams in order to reduce time to market for application and to improve overall customer success.

3. DevOps tools include:

1. Linux
2. Git and GitHub
3. Maven
4. Jenkins
5. Docker
6. Kubernetes
7. Terraform

4. DevOps’s main objective is to reduce friction between development and operation team members for faster application release. SRE is a software approach to solving engineering problems by ensuring system stability, reliability, and availability.

5. DevSecOps is a software Development approach that put security management into perspective during the development process. It is a combination of 3 teams – Development, Security, and Operation.