Docker Tutorial

• Docker Tutorial
• Docker Architecture

Docker Installation

• Ubuntu Docker Installation
• Debian Docker Installation
• CentOS Docker Installation
• Windows Docker Installation
• MacOS Docker Installation

How to use Docker

• Docker Hello World
• Docker Container
• Docker Image
• Docker Container Connection
• Docker Rpository
• Docker Dockerfile
• Docker Compose
• Docker Machine
• Docker Swarm

Docker Instance

• Docker install Ubuntu
• Docker install CentOS
• Docker install Nginx
• Docker install Node.js
• Docker install PHP
• Docker install MySQL
• Docker install Tomcat
• Docker install Python
• Docker install Redis
• Docker install MongoDB
• Docker install Apache

Docker Container Lifecycle Command

• Docker run command
• Docker start/stop/restart commands
• Docker kill command
• Docker rm command
• Docker pause/unpause command
• Docker create command
• Docker exec command

Docker Container Operation Command

• Docker ps command
• Docker inspect command
• Docker top command
• Docker attach command
• Docker events command
• Docker logs command
• Docker wait command
• Docker export command
• Docker port command

Docker Container rootfs Command

• Docker commit command
• Docker cp command
• Docker diff command

Docker Mirror Repository Command

• Docker login/logout command
• Docker pull command
• Docker push command
• Docker search command

Docker Local Image Management Command

• Docker images command
• Docker rmi command
• Docker tag command
• Docker build command
• Docker history command
• Docker save command
• Docker load command
• Docker import command

Docker info|version Command

• Docker info command
• Docker version command

Docker Swarm management

Docker Swarm is a native clustering and orchestration tool for Docker. It enables you to create, manage, and scale a swarm of Docker nodes and services in a distributed, fault-tolerant manner. In this tutorial, we'll provide an overview of Docker Swarm and cover some basic swarm management tasks.

• Initialize a swarm:

To create a new swarm, you need to initialize it on a manager node. Run the following command on the machine you want to designate as the manager node:

docker swarm init --advertise-addr <MANAGER-IP>

Replace <MANAGER-IP> with the IP address of the manager node. This command generates a join token for worker nodes, which you'll use to add nodes to the swarm.

• Add nodes to the swarm:

To add a worker node to the swarm, run the following command on the worker node:

docker swarm join --token <WORKER-JOIN-TOKEN> <MANAGER-IP>:<MANAGER-PORT>

Replace <WORKER-JOIN-TOKEN> with the token generated by the docker swarm init command, and <MANAGER-IP> and <MANAGER-PORT> with the IP address and port of the manager node.

To add more manager nodes, you'll need a manager join token. To retrieve it, run the following command on an existing manager node:

docker swarm join-token manager

Then, use the displayed manager join token in the docker swarm join command on the new manager node.

• List nodes:

To list all nodes in the swarm, run the following command on a manager node:

docker node ls

• Create a service:

To create a new service, run the following command on a manager node:

docker service create --name <SERVICE-NAME> --replicas <NUM-REPLICAS> <IMAGE>

Replace <SERVICE-NAME> with a name for the service, <NUM-REPLICAS> with the desired number of replicas, and <IMAGE> with the Docker image to use for the service.

• List services:

To list all services running in the swarm, run the following command on a manager node:

docker service ls

• Scale a service:

To scale a service, adjust the number of replicas, run the following command on a manager node:

docker service update --replicas <NUM-REPLICAS> <SERVICE-NAME>

Replace <NUM-REPLICAS> with the desired number of replicas, and <SERVICE-NAME> with the name of the service.

• Remove a service:

To remove a service, run the following command on a manager node:

docker service rm <SERVICE-NAME>

Replace <SERVICE-NAME> with the name of the service.

• Leave the swarm:

To remove a node from the swarm, run the following command on the node:

docker swarm leave

If the node is a manager node, use the --force option:

docker swarm leave --force

This tutorial provides a basic overview of Docker Swarm management tasks.

1. Scaling Applications with Docker Swarm:

   • Description: Docker Swarm allows scaling services horizontally by replicating containers across multiple nodes.

   • Code Example (Scaling Service):

     docker service scale my_service=3
     

2. Docker Swarm Service Updates and Rollbacks:

   • Description: Docker Swarm facilitates rolling updates and rollbacks for services.

   • Code Example (Service Update):

     docker service update --image new_image:tag my_service
     

   • Code Example (Rollback):

     docker service rollback my_service
     

3. Managing Secrets in Docker Swarm:

   • Description: Docker Swarm supports secret management for sensitive data like passwords or certificates.

   • Code Example (Creating Secret):

     echo "my_secret_value" | docker secret create my_secret -
     

4. Load Balancing in Docker Swarm:

   • Description: Docker Swarm has built-in load balancing for distributing traffic among service replicas.

   • Code Example (Load Balanced Service):

     docker service create --name my_service --replicas 3 -p 80:80 my_image
     

5. Docker Swarm Networking Options:

   • Description: Docker Swarm provides overlay networks for seamless communication between services.

   • Code Example (Creating Overlay Network):

     docker network create --driver overlay my_overlay_network
     

6. Monitoring and Logging in Docker Swarm:

   • Description: Docker Swarm can be monitored and logged using tools like Prometheus and Grafana. Docker provides native logging capabilities.

   • Code Example (Logging):

     docker service logs my_service
     

7. Troubleshooting Docker Swarm Issues:

   • Description: Troubleshoot Docker Swarm issues by checking service logs, inspecting containers, and using diagnostic commands.

   • Code Example (Checking Service Logs):

     docker service logs my_service