DEV Community: AyushDabhi

Docker Commands

AyushDabhi — Sat, 08 Apr 2023 21:14:39 +0000

docker --version

Used to check your docker version

docker --version

docker pull

Which pulls the image from the repository to your local environment

docker pull redis # It will pull redis image

docker ps

It gives running container details.

docker ps

docker start

Restart a stopped container.

docker start 7aaaa6322b5f # write container id or name
#OR
docker start sad_hugle

Note: CONTAINER ID and NAME is randomly generated. Check your CONTAINER ID and NAME by running the docker ps command.

docker stop

Use to stop running container

docker stop CONTAINER_ID 
# OR
docker stop NAMES

docker run

Which combines pull and start, pulls the image if it's not locally available and then starts it right away.

docker run node #It will pull and start the node container

docker run -d

Run the container in detached mode. This means that the container will run in the background and the console output will not be shown in the current terminal session.

docker run -d redis

docker ps -a

Which gives you all the containers no matter if they're running currently or not.

docker ps -a

docker run -p6000:6794

Allows you to bind the port of your host to the container

-p => port

6000 => The port of Host

6794 => The port of the container

docker images

Which gives you all the images that you have locally available.

docker images

docker rm

Remove a Container

docker rm CONTAINER_ID

#OR

docker rm NAME

Note: You can't remove running container directly first stop the container using `docker stop CONTAINER_ID`

docker rmi

Remove images

docker rmi IMAGE_ID 

#OR

docker rmi IMAGE_NAME

docker rmi -f IMAGE_ID  # -f means forced fully remove image

#OR

docker rmi -f IMAGE_NAME

Note: Delete all dependent containers to remove the image

Thanks for reading !!

Create your Jenkins Pipeline Job

AyushDabhi — Tue, 28 Mar 2023 20:01:21 +0000

Creating your first Jenkins pipeline.

Step 1: Log into Jenkins and select ‘New item’ from the dashboard.

Step 2: Next, enter a name for your pipeline and select ‘pipeline’ project. Click on ‘ok’ to proceed.

Step 3: Scroll down to the pipeline and choose if you want a declarative pipeline or a scripted one.

Step 4a: If you want a scripted pipeline then choose ‘pipeline script’ and start typing your code.

Step 4b: If you want a declarative pipeline then select ‘pipeline script from SCM’ and choose your SCM. In my case, I’m going to use Git throughout this demo. Enter your repository URL.

Step 5: Within the script path is the name of the Jenkinsfile that is going to be accessed from your SCM to run. Finally, click on ‘apply’ and ‘save’. You have successfully created your first Jenkins pipeline.

Scripted Pipeline Vs Declarative Pipeline

Declarative Pipeline Demo

The first part of the demo shows the working of a declarative pipeline.

Refer the above ‘Creating your first Jenkins pipeline’ to start.

Let me start the demo by explaining the code I’ve written in my Jenkinsfile.

Since this is a declarative pipeline, I’m writing the code locally in a file named ‘Jenkinsfile’ and then pushing this file into my global git repository.

While executing the ‘Declarative pipeline’ demo, this file will be accessed from my git repository.

The following is a simple demonstration of building a pipeline to run multiple stages, each performing a specific task.

Required Fields of Jenkinsfile

Jenkinsfile code

pipeline {

   agent any

   stages {

     stage("build") {

       steps {
           echo 'building the application...'
       }
     }
     stage("test") {

       steps {
          echo 'testing the application...'
       }
     }
     stage("deploy") {

       steps {
          echo 'deploying the application...'
       }
     }
  }
}

push this Jenkinsfile into global git repository

Output

Click on "Build Now"

I hope this blog helped you understand the basics of scripted and declarative pipeline and you able to perform declarative pipeline demo !

TFTP ( Trivial File Transfer Protocol ) Server and Client Configurations

AyushDabhi — Mon, 27 Mar 2023 20:43:36 +0000

What is TFTP ?

Trivial File Transfer Protocol (TFTP) is a simple file
transfer protocol that allows a client to retrieve or
transfer files from a server.

It is a UDP-based protocol that uses port 69 for
communication.

TFTP supports only two transfer modes: "netascii" and
"octet." Netascii mode is used for transferring text files,
while octet mode is used for transferring binary files.

Advantages of TFTP

Lightweight: TFTP is designed to be lightweight, meaning
it uses fewer system resources than other file transfer
protocols such as network switches and
routers.
Simple: TFTP has a simple packet format and supports only
two transfer modes, making it easy to implement and use.
Fast: TFTP uses the User Datagram Protocol (UDP) instead
of Transmission Control Protocol (TCP), which makes it
faster than other protocols.
Easy to configure: TFTP is easy to configure and does not
require complex setup or authentication.
Widely supported: TFTP is widely supported by many network
devices, including routers, switches, and firewalls.
Low overhead: TFTP has a low overhead, meaning it uses
minimal network bandwidth and system resources.

Disadvantages of TFTP

No authentication: TFTP does not provide any authentication mechanisms, which means that anyone who has access to the TFTP server can download or upload files to it.
Slow transfer speeds: TFTP uses UDP (User Datagram Protocol), which does not provide any error-checking or congestion control mechanisms. This can lead to slower transfer speeds.
Limited file size: TFTP has a maximum file size limit of 32 MB, which makes it unsuitable for transferring large files.
No encryption: TFTP does not provide any encryption mechanisms, which means that data transferred using TFTP can be intercepted and read by third parties.

How can we configure TFTP server in Ubuntu?

Step 1: Open the terminal and update the package lists for apt

sudo apt update

Step 2: Install the TFTP server software on the PC that will act as the server using the following command:

sudo apt install tftpd-hpa

Step 3: Check the status of the TFTP daemon service called "tftpd-hpa" on a Linux system

sudo systemctl status tftpd-hpa

Step 4 : Open and edit the configuration file for the TFTP daemon service called "tftpd-hpa" on a Linux system

sudo gedit /etc/default/tftpd-hpa

Step 5 : Make tftp Folder

sudo mkdir /tftp

Step 6 : Change the ownership of the directory "/tftp" to the user and group "tftp" on a Linux system.

sudo chown tftp:tftp /tftp

Step 7 : Restart the TFTP daemon service called "tftpd-hpa" on a Linux system.

sudo systemctl restart tftpd-hpa

How can we configure TFTP Client in Ubuntu?

Step 1 :

sudo apt install tftp-hpa

If you got errrors run below commands

sudo lsof /var/lib/dpkg/lock
sudo lsof /var/lib/apt/lists/lock
sudo lsof /var/cache/apt/archives/lock

sudo rm /var/lib/apt/lists/lock
sudo rm /var/cache/apt/archives/lock
sudo rm /var/lib/dpkg/lock

sudo kill -9 <process_id>

Server Command

ip a show

Client Command

Step 1 : Start a TFTP client session with a TFTP server located at the specified IP address.

sudo tftp <<server's ip_address>>

Step 2 : Download a file called "server.txt" from a remote TFTP server to the local system.

get server.txt

Server Command

Upload a file called "client.txt" from the local system to a remote TFTP server.

put client.txt

Conclusion

Overall, TFTP is a simple and lightweight protocol that is suitable for transferring small files in a low-security environment. However, it may not be the best choice for transferring sensitive or large files, or for use in high-security environments where data privacy is a concern.

Jenkins Setup On Digital- Ocean Cloud ( Run Jenkins as a Docker container )

AyushDabhi — Sun, 26 Mar 2023 08:23:45 +0000

Jenkins is an open-source automation server that can be used to automate various tasks like building, testing, and deploying software.

DigitalOcean is a cloud hosting platform that provides a simple and cost-effective way to deploy and manage applications in the cloud.

In this blog, we will discuss how to set up Jenkins on DigitalOcean cloud.

To set up Jenkins on DigitalOcean, the first step is to create a Droplet.

A Droplet is a virtual machine that can be used to host applications in the cloud. To create a Droplet, follow these steps:

Step 1: Create a Droplet on DigitalOcean

1) Log in to your DigitalOcean account. Click on the "Create" button and select "Droplets."

2) Choose Region

3) Choose an Image

4) Choose size

5) Choose Authentication Method

i) Password

ii) SSH key (We are Using)

6) Click on the Create Droplet button to create your Droplet.

Rename droplet name :

7) Click on Networking and click on Create Firewall button

Inbound Rules :

Outbound Rules :

Firewall Created :

Step 2: Install Docker on your Droplet

1) SSH to your droplet

Copy your droplet's IPV4

2) Update your package index by running the command:
apt update

3) Install docker by running the command :
apt install docker.io

Step 3: Install Jenkins on Docker container

1) docker run -p 8080:8080 -p 50000:50000 -d -v jenkins_home:/var/jenkins_home jenkins/jenkins:lts

2) docker ps

3) Access Jenkins on web-browser via typing
ip_address:jenkins_port

4) Getting Unlock Jenkins Password

5) Install Suggested Plugins

6) Create First Admin User

Congratulations🥳

Follow me! @ayushdabhi

#jenkins #devops #cloud #digitalocean

DEV Community: AyushDabhi

Docker Commands

docker --version

docker pull

docker ps

docker start

Note: CONTAINER ID and NAME is randomly generated. Check your CONTAINER ID and NAME by running the docker ps command.

docker stop

docker run

docker run -d

docker ps -a

docker run -p6000:6794

docker images

docker rm

Note: You can't remove running container directly first stop the container using docker stop CONTAINER_ID

docker rmi

Note: Delete all dependent containers to remove the image

Create your Jenkins Pipeline Job

Creating your first Jenkins pipeline.

Scripted Pipeline Vs Declarative Pipeline

Declarative Pipeline Demo

Required Fields of Jenkinsfile

Jenkinsfile code

Output

TFTP ( Trivial File Transfer Protocol ) Server and Client Configurations

What is TFTP ?

Advantages of TFTP

Disadvantages of TFTP

How can we configure TFTP server in Ubuntu?

How can we configure TFTP Client in Ubuntu?

Server Command

Client Command

Server Command

Conclusion

Jenkins Setup On Digital- Ocean Cloud ( Run Jenkins as a Docker container )

Note: You can't remove running container directly first stop the container using `docker stop CONTAINER_ID`