PODS

Question 1

Docker commands for

1. starting a container
2. stop a container
3. restarting a container
4. kill a container
5. remove a stopped container
6. inspect a container

Answer 1

1. docker start 《img》
2. docker stop 《containerID》
3. docker restart 《containerID》
4. docker kill 《containerID》
5. docker rm 《containerID》
6. docker inspect 《containerID》 | less

Question 2

Does docker provide a default name when we do not provide one for the container ?

Answer 2

Yes .docker provides a default name but it is best practice to provide a name yourself as docker names are weird

Question 3

how to build a docker image ?

Answer 3

Two ways

1. you can imperatively run all the commands necessary to build an image
2. You can use a Dockerfile which automates the image building

Question 4

give an example of Dockerfile ?

Answer 4

FROM centos # build from base image

MAINTAINER kcp # id of person who
maintains the dockerfile
ADD /repo/src/main/ # add repo files to
container
RUN yum install && \
yum update killtcp && \
bash && \
yum clean all #can run multiple
commands using \

CMD “/usr/bin “ [“po’,”c” ]

Question 5

POD

Answer 5

POD contains collection of application containers and volumes running in a same execution environment.

All containers inside a POD land on same.machine

Applications running inside a POD
Share
Same IP
host name

Question 6

What is Imperative and Declarative configuration

Answer 6

Declarative configuration:
You write down your desired state in a file and submit to k8s and k8s makes sure that desired state meets actual state
Ex. kubectl apply -f pod.yaml
Where pod.yaml is the declarative configuration file

Imperative configuration:
Series of commands run to meet the requirements
Ex. kubectl run nginx –image=nginx