hema007 – Best DevOps

PODS (Yaml file)

hema007 — Thu, 08 Jul 2021 06:34:06 +0000

apiVersion: v1
kind: Pod
metadata:
  name: container
  labels:
    app: hello
    server: web-server
  spec:
    spec:
  containers:
  - name:devopsschool1 
    image:scmgalaxy/nginx-devopsschoolv1

    ports:
    - name: nginx-port
      containerPort: 80

  - name:devopsschool
    image: webimp/mysql-56-slim

    ports:
    - name: mysql
      containerPort: 3306

hema007 — Wed, 07 Jul 2021 10:30:14 +0000

Diff between Compiled Lang Vs Interpreted Lang Vs Declarative Lang?

complier lang

Takes entire program as single input and converts it into object code which is stored in the file.
Intermediate Object code is generated
e.g: C,C++,java
Compiled programs run faster because compilation is done before execution.
Memory requirement is more due to the creation of object code.
Error are displayed after the entire program is compiled
Source code —Compiler —Machine Code —Output

Interperted lang

Takes single instruction as single input and executes instructions.
Intermediate Object code is NOT generated
e.g: Perl, Python, Matlab
Interpreted programs run slower because compilation and execution take place simultaneously.
Memory requirement is less.
Error are displayed for every single instruction.
Source Code —Interpreter —Output

Declarative lang

It’s a method of programming based around describing what something should do or be instead of describing how it should work.

ex:xhtml, html
Its advantages include effective code, which can be applied by using ways, easy extension, high level of abstraction, etc.

PODS

hema007 — Wed, 07 Jul 2021 10:04:08 +0000

Pods it is bascially a environment to run a container.
Pods can have one or more container
All pods are “EMPERMERAL” meaning no pod is redeployed.
Pod will run as long as the container is running .

What POD contains? ONE imag
pods contain one / more container.
pods contain shared networks.
Pods contain Unique ip address

Lifecycle of the POD? ONE image
Pod life cycle startng with
PENDING PHASE
RUNNING PHASE
SUCEEDED/FAILED PHASE
pending: when pod is ready to run but one/more container is not set
running: pod is running i.e, starting
suceeding /failed phases: container in the Pod is terminated .

Types of PODS?
one pod per container- one container per pod
one pod for multiple container- multiple container per pod

K8…S

hema007 — Wed, 07 Jul 2021 08:07:49 +0000

– Define What is Kubernetes with Image?

Kubernetes : It is a “google” product .Written in “GO ” language. It is a open source platform for managing self healing ,Automated rollbacks, Auto Scaling, load balancing .

Why Kubernetes with Image?

Kubernetes solves the problem of scalability, problem of managing multiple host ,problem related to load balancing multiple conatiner running with same port in one host .

Kubernetes Architecuture with Image?

It is a client-server architecture.

It has master node and worker node.

master node consists of four components they are as follows :1.API Server 2. Cluster Store 3.Controller Manager 4. Kube-Schedular

worker node consist of three components they are as follows : 1. Proxy 2.Kubelet 3.Docker-engine

How Kubernetes Works with Image