mvn clean
mvn install
mvn deploy

What are the Ports being used in Artifactory and why? Create a table and describe it.

Find out which maven goal help you to upload a artifact?

mvn deploy

Find out which gradle tasks help you to upload a artifact?

maven-publish

What are the 10 feature of Kubernetes?

1)Self-healing
2)Storage orchestration
3)Automated Scheduling
4)Automated rollouts & rollback
5)Horizontal Scaling & Load Balancing
6)Provides a higher density of resource utilization
7)Auto-scalable infrastructure
8)Infrastructure is loosely coupled to each component can act as a separate unit
9)Custom Scheduling
10)PodDisruptionBudget

How kubernetes works?

works same as like helmsman , Where it manages the Nodes and PODS.

What are the components of Master?

etcd,API Server,Controller Manager,Scheduler

etcd :It stores the configuration information which can be used by each of the nodes in the cluster. It is a high availability key value store that can be distributed among multiple nodes. It is accessible only by Kubernetes API server as it may have some sensitive information. It is a distributed key value Store which is accessible to all.

API Server : 

Kubernetes is an API server which provides all the operation on cluster using the API. API server implements an interface, which means different tools and libraries can readily communicate with it. Kubeconfig is a package along with the server side tools that can be used for communication. It exposes Kubernetes API. 

Controller Manager
This component is responsible for most of the collectors that regulates the state of cluster and performs a task. In general, it can be considered as a daemon which runs in nonterminating loop and is responsible for collecting and sending information to API server. It works toward getting the shared state of cluster and then make changes to bring the current status of the server to the desired state. The key controllers are replication controller, endpoint controller, namespace controller, and service account controller. The controller manager runs different kind of controllers to handle nodes, endpoints, etc.

Scheduler
This is one of the key components of Kubernetes master. It is a service in master responsible for distributing the workload. It is responsible for tracking utilization of working load on cluster nodes and then placing the workload on which resources are available and accept the workload. In other words, this is the mechanism responsible for allocating pods to available nodes. The scheduler is responsible for workload utilization and allocating pod to new node.

What are the components of Worker?

Docker (container)
Kubelet Service
Kubernetes Proxy Service

What are the components of Workstation?

kubectl ,JSON

[root@pks]# history
1 clear
2 sudo yum install -y yum-utils device-mapper-persistent-data lvm2
3 sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
4 sudo yum install –y https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
5 sudo yum-config-manager --enable rhui-REGION-rhel-server-extras
6 sudo yum install -y docker-ce

Verification :

[root@pks ~]# cd
[root@pks ~]# which dockerd
/bin/dockerd
[root@pks ~]# which docker
/bin/docker
[root@pks ~]# ps -eaf | grep dockerd
root 951 1 0 03:32 ? 00:00:01 /usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock
root 1783 1759 0 05:00 pts/1 00:00:00 grep --color=auto dockerd
[root@pks ~]# which containerd
/bin/containerd
[root@pks ~]# ps -eaf | grep containerd
root 862 1 0 03:32 ? 00:00:06 /usr/bin/containerd
root 951 1 0 03:32 ? 00:00:01 /usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock
root 1787 1759 0 05:00 pts/1 00:00:00 grep --color=auto containerd

[root@pks ~]# which docker
/bin/docker

[root@pks ~]# cd
[root@pks ~]# which dockerd
/bin/dockerd
[root@pks ~]# which docker
/bin/docker
[root@pks ~]# ps -eaf | grep dockerd
root 951 1 0 03:32 ? 00:00:01 /usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock
root 1783 1759 0 05:00 pts/1 00:00:00 grep --color=auto dockerd
[root@pks ~]# which containerd
/bin/containerd
[root@pks ~]# ps -eaf | grep containerd
root 862 1 0 03:32 ? 00:00:06 /usr/bin/containerd
root 951 1 0 03:32 ? 00:00:01 /usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock
root 1787 1759 0 05:00 pts/1 00:00:00 grep --color=auto containerd

Assignment#1

Create a Ubuntu container

[root@pks ~]# docker pull ubuntu
Using default tag: latest
latest: Pulling from library/ubuntu
Digest: sha256:b3e2e47d016c08b3396b5ebe06ab0b711c34e7f37b98c9d37abe794b71cea0a2
Status: Image is up to date for ubuntu:latest
docker.io/library/ubuntu:latest

[root@pks ~]# docker ps -a
CONTAINER ID   IMAGE     COMMAND              CREATED          STATUS                      PORTS     NAMES
8e6af5cf67b3   ubuntu    "bash"               27 seconds ago   Exited (0) 26 seconds ago             silly_boyd

[root@pks ~]# docker images
REPOSITORY               TAG       IMAGE ID       CREATED        SIZE

ubuntu                   latest    c29284518f49   7 days ago     72.8MB

Install Update, git & apache2

[root@pks ~]# docker ps -a
CONTAINER ID   IMAGE     COMMAND   CREATED   STATUS    PORTS     NAMES
[root@pks ~]# docker images
REPOSITORY               TAG       IMAGE ID       CREATED        SIZE

ubuntu                   latest    c29284518f49   7 days ago     72.8MB

[root@pks]# docker run -itd ubuntu
da2946cadce9993be089119595c07b2bf9023cc6fe8484e382ba40b699d2ff0a
[root@pks]# docker ps -a
CONTAINER ID   IMAGE     COMMAND              CREATED         STATUS         PORTS                                   NAMES
da2946cadce9   ubuntu    "bash"               6 seconds ago   Up 5 seconds                                           focused_sinoussi

root@da2946cadce9:/# apt install git

root@da2946cadce9:/# git version
git version 2.25.1

root@da2946cadce9:/# apt install apache2
root@da2946cadce9:/# apache2 -version
Server version: Apache/2.4.41 (Ubuntu)
Server built:   2021-07-05T07:16:56

Press Ctl+p+q ( to exit if you are in bash )

Assignment#2

Create a httpd container exposed at 8080 port

[root@pks]# docker pull httpd
Using default tag: latest
latest: Pulling from library/httpd
Digest: sha256:1fd07d599a519b594b756d2e4e43a72edf7e30542ce646f5eb3328cf3b12341a
Status: Image is up to date for httpd:latest
docker.io/library/httpd:latest

[root@pks]# docker images|grep httpd
httpd                    latest    bd29370f84ea   12 days ago    138MB

[root@pks]# docker run -d -p 8080:80 --name webserver httpd
e18a1c96c9b1ab7a688f2cd2beb0eaba6874a17c4955a4e41ffe98e68bbf76e9

[root@pks]# docker ps -a
CONTAINER ID   IMAGE     COMMAND              CREATED          STATUS          PORTS                                   NAMES
e18a1c96c9b1   httpd     "httpd-foreground"   26 seconds ago   Up 25 seconds   0.0.0.0:8080->80/tcp, :::8080->80/tcp   webserver

[root@pks]# docker attach da2946cadce9

root@da2946cadce9:/# apt update

Get:1 http://security.ubuntu.com/ubuntu focal-security InRelease [114 kB]
Get:2 http://archive.ubuntu.com/ubuntu focal InRelease [265 kB]
Get:3 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages [985 kB]
Get:4 http://archive.ubuntu.com/ubuntu focal-updates InRelease [114 kB]
Get:5 http://archive.ubuntu.com/ubuntu focal-backports InRelease [101 kB]
Get:6 http://security.ubuntu.com/ubuntu focal-security/restricted amd64 Packages [428 kB]
Get:7 http://archive.ubuntu.com/ubuntu focal/multiverse amd64 Packages [177 kB]
Get:8 http://archive.ubuntu.com/ubuntu focal/restricted amd64 Packages [33.4 kB]
Get:9 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages [1275 kB]
Get:10 http://security.ubuntu.com/ubuntu focal-security/multiverse amd64 Packages [32.7 kB]
Get:11 http://security.ubuntu.com/ubuntu focal-security/universe amd64 Packages [784 kB]
Get:12 http://archive.ubuntu.com/ubuntu focal/universe amd64 Packages [11.3 MB]
Get:13 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages [1417 kB]
Get:14 http://archive.ubuntu.com/ubuntu focal-updates/universe amd64 Packages [1055 kB]
Get:15 http://archive.ubuntu.com/ubuntu focal-updates/multiverse amd64 Packages [37.3 kB]
Get:16 http://archive.ubuntu.com/ubuntu focal-updates/restricted amd64 Packages [474 kB]
Get:17 http://archive.ubuntu.com/ubuntu focal-backports/main amd64 Packages [2668 B]
Get:18 http://archive.ubuntu.com/ubuntu focal-backports/universe amd64 Packages [6303 B]
Fetched 18.6 MB in 7s (2487 kB/s)
Reading package lists... Done
Building dependency tree
Reading state information... Done

run a git command in container from outside

[root@pks]# docker exec fb96ba213cac git version
git version 2.25.1

Access(curl) container from node

[root@pks]# wget localhost:8080
--2021-07-21 06:00:02--  http://localhost:8080/
Resolving localhost (localhost)... ::1, 127.0.0.1
Connecting to localhost (localhost)|::1|:8080... connected.
HTTP request sent, awaiting response... 200 OK
Length: 45 [text/html]
Saving to: ‘index.html.1’

100%[=========================================================================================================================================================>] 45          --.-K/s   in 0s

2021-07-21 06:00:02 (3.70 MB/s) - ‘index.html.1’ saved [45/45]

Assignment#3

– Where is the LOCAL Registry and How do i find out???

By using docker info we can fine . 

[root@pks]# docker info
Docker Root Dir: /var/lib/docker 

[root@pks]# ll
total 8
drwx--x--x.  4 root root  120 Jul 20 06:06 buildkit
drwx-----x.  4 root root  150 Jul 21 06:28 containers
drwx------.  3 root root   22 Jul 20 06:06 image
-rw-r--r--.  1 root root 1388 Jul 21 06:51 info
drwxr-x---.  3 root root   19 Jul 20 06:06 network
drwx-----x. 16 root root 4096 Jul 21 06:28 overlay2
drwx------.  4 root root   32 Jul 20 06:06 plugins
drwx------.  2 root root    6 Jul 21 03:32 runtimes
drwx------.  2 root root    6 Jul 20 06:06 swarm
drwx------.  2 root root    6 Jul 21 03:32 tmp
drwx------.  2 root root    6 Jul 20 06:06 trust
drwx-----x.  2 root root   50 Jul 21 03:32 volumes

[root@pks]# cd overlay2
[root@pks]# ll
total 4
drwx-----x. 5 root root   69 Jul 21 06:28 2084f702d84cea4437d29d75d7bdb298c6423960f92937e645e7b357dbd60611
drwx-----x. 4 root root   72 Jul 21 06:28 2084f702d84cea4437d29d75d7bdb298c6423960f92937e645e7b357dbd60611-init
drwx-----x. 4 root root   72 Jul 20 06:08 3582fc98eadb391e96c56471e63e75a373347b041cc0830d64d0191aa86d2dad
drwx-----x. 4 root root   72 Jul 20 06:08 4042334baa7104f5f3c37c24933f4b48ebafd9b43fdcfbff8427cf7f6f100427
drwx-----x. 4 root root   72 Jul 20 06:08 44e3377d7f847deb718d8bc7cf6973c73ca66b32fbf3678e7a78a58b920d3aec
drwx-----x. 4 root root   55 Jul 21 06:28 5bcfff4c60322476d07f60b7f14e58bba39f4fa9beabf56a263540e263c6d743
drwx-----x. 4 root root   72 Jul 21 06:28 5bcfff4c60322476d07f60b7f14e58bba39f4fa9beabf56a263540e263c6d743-init
drwx-----x. 3 root root   47 Jul 21 05:14 72a82d12de04aea06a4c2d6735541eb453f445cfe2234d94a864f108094248f7
drwx-----x. 3 root root   47 Jul 20 07:04 88ffbaf180e0ae193119811a9990dd96ce95f666a4c23955fd94d3b5f5651053
drwx-----x. 4 root root   72 Jul 20 06:08 8a838646394c6c762c14ae565e4b9f00f8d3c5d45f4084aafad52e59c735f91d
drwx-----x. 4 root root   55 Jul 20 07:24 8f4f85670ff3710089f99a38b811d09acc26fa62f4de44f166e42d61d03f82a8
brw-------. 1 root root 8, 2 Jul 21 03:32 backingFsBlockDev
drwx-----x. 3 root root   47 Jul 20 06:08 e6059da5aaeb1b5715ed5709379b39f941b8f0fafc6f24b18709685d534e5f8e
drwx-----x. 4 root root   55 Jul 20 07:13 f4d3f3f0f672576f349e15cd511ee932f678fa6fa0f17fd7a40382afec38fa3f
drwx-----x. 2 root root 4096 Jul 21 06:28 l

– What is diff between docker pause and docker unpuase?

commands to pause and resume containers

– What is significant of docker stop and docker kill?

if you wish to soft stop we will use stop . 
Kill for will force shut down

Create an image with base – centos and git must be installed in it.

[root@pks]# docker run -itd centos
06e615d2e0d14caed3628301dc4db4bf23dd726584df0a88f250003486a7a786


[root@pks]# docker ps -a
CONTAINER ID   IMAGE     COMMAND       CREATED          STATUS                      PORTS     NAMES
06e615d2e0d1   centos    "/bin/bash"   28 seconds ago   Up 27 seconds                         magical_shockley


[root@pks]# docker attach 06e615d2e0d1

[root@06e615d2e0d1 /]# git --version
git version 2.27.0

[root@pks-wells ~]# docker commit -m "installed httpd and git" -a "HemanthVusirika" 06e615d2e0d1 centos-git-21-0

[root@pks]# docker images
REPOSITORY               TAG       IMAGE ID       CREATED         SIZE
centos-git-21-07         latest    d8795fb9189b   8 seconds ago   335MB