- \n
- You can get the complete demo app from my github repository here<\/a>.<\/li>\n
- Or build the demo app(thymeleaf-app) by following this tutorial.<\/a><\/li>\n
- Learn about dockers and containers here<\/a><\/li>\n<\/ul>\n
<\/p>\n
What we would do<\/strong><\/p>\n
- \n
- Install Docker on Windows\/Linux<\/a><\/li>\n
- Create a Dockerfile<\/a><\/li>\n
- Build a Docker Image<\/a><\/li>\n
- Run the image (Create a container)<\/a><\/li>\n
- View, Stop and Delete Containers<\/a><\/li>\n
- Some Important Docker Commands<\/a><\/li>\n
- What Next? Kubernetes!<\/a><\/li>\n<\/ol>\n
<\/p>\n
1. Install and Start Docker on Windows\/Linux<\/strong><\/h5>\n
The interesting thing is that whatever, your operating system is, you can install docker!<\/p>\n
- \n
- If your system is Windows 10 64-bit, Pro, Enterprise or Education then download and install Docker from Docker Hub<\/a>.<\/li>\n
- If your system is Windows 10 Home or any other, then download and install Docker Toolbox here<\/a><\/li>\n
- Check that visualization is enabled in your Operating System. Do this by opening Task Manager. Click on performance tab as you can see in the figure below<\/li>\n<\/ul>\n
![\"Visualization](\"https:\/\/www.kindsonthegenius.com\/microservices\/wp-content\/uploads\/sites\/18\/2019\/12\/Visualization-Enabled-on-Windows-1.jpg\")
<\/a>Visualization Enabled on Windows 10 64-bit<\/figcaption><\/figure>\n In this tutorial, we use Docker Toolbox.<\/p>\n
<\/p>\n
2. Create a Dockerfile<\/strong><\/h5>\n
Now you need to open the Spring Boot application either in Spring Toolsuite or IntelliJ (STS is used here).<\/p>\n
Run the application and test it to make sure it works well!<\/p>\n
Step 1:<\/strong> Create a file in your spring boot project directory(in sts). Name it Dokerfile<\/p>\n
Step 2:<\/strong> Copy the code below and paste in this file and save it.<\/p>\n
FROM openjdk:8-jdk-alpine\r\nVOLUME \/tmp\r\nARG JAR_FILE=target\/*.jar\r\nCOPY ${JAR_FILE} app.jar\r\nENTRYPOINT [\"java\",\"-Djava.security.egd=file:\/dev\/.\/urandom\",\"-jar\",\"\/app.jar\"]\r\n<\/pre>\nYou can also get this code from here(Spring Boot with Docker)<\/a><\/p>\n
Step 3<\/strong>: Start Docker by simply opening the Docker QuickStart Terminal. You’ll see it as a shortcut on your desktop.<\/p>\n
It opens and provides a command line environment as shown below:<\/p>\n
![\"Docker](\"https:\/\/www.kindsonthegenius.com\/microservices\/wp-content\/uploads\/sites\/18\/2019\/12\/Docker-Toolbox-QuickStart-Terminal.jpg\")
<\/a>Docker Toolbox QuickStart Terminal<\/figcaption><\/figure>\n Notice the ip address of the default docker machine. We would use it later when we run our image. This is because the container has to run in this machine.<\/p>\n
<\/p>\n
3. Build a Docker Image<\/strong><\/h5>\n
The next step is to build a Docker image of your application. Follow the steps<\/p>\n
Step 1<\/strong>: Right-click on your project name and choose ‘Show in Local Terminal’ > Git Bash<\/p>\n
If you don’t see Git Bash, just install it easily and restart Spring Tool Suite.<\/p>\n
Step 2:<\/strong> Run the command below to build the docker image<\/p>\n
docker build -t thymeleaf-image .\r\n<\/pre>\n
This command creates an docker image of your application with name thymeleaf-image. The dot at the end represents the directory where the image is to be create. In this case is the current directory.<\/p>\n
Now to you can run the command below to see the images available<\/p>\n
docker image ls\r\n<\/pre>\n
<\/p>\n
4. Run the image (Create a container)<\/strong><\/h5>\n
Now that you have the image built, you can run the image using the command below<\/p>\n
docker run -p8080:8080 thymeleaf-image\r\n<\/pre>\n
Note that you need to provide exactly the same name as the image you created. Also note the port mapping of -p8080:8080, this means the we are mapping port 8080 of the container to port 8080 in the machine.<\/p>\n
Now visit http:\/\/192.168.9.101:8080<\/p>\n
You can see that the application runs perfectly inside a container!.<\/p>\n
Thumbs up if you got to this point.<\/p>\n
<\/p>\n
5. View, Stop and Delete Containers<\/strong><\/h5>\n
If for any reason, you want to delete a container (for any reason), you can do that following two steps:<\/p>\n
- \n
- stop the container<\/li>\n
- remove the container<\/li>\n<\/ul>\n
Use the command below to stop a container<\/p>\n
docker stop <container-id>\r\n<\/pre>\n
<\/p>\n
The used the command delete a container<\/p>\n
docker rm <container-id>\r\n<\/pre>\n
<\/p>\n
Note<\/strong>: To get the container id for your container, run the command below<\/p>\n
docker rm <container-id>\r\n<\/pre>\n
<\/p>\n
6. Some Important Docker Commands<\/strong><\/h5>\n
By now you have learn the commands the build an image, to run an image as well as to list containers. I’ll teach you\u00a0 a few more command<\/p>\n
To remove an image,<\/p>\n
docker rmi <container-name>\r\n<\/pre>\n
To view all images,<\/p>\n
docker image ls\r\n<\/pre>\n
Starting a stopped container<\/p>\n
docker container start <container-name>\r\n<\/pre>\n
At this point, I think I should make another lesson on docker commands. So we can keep this tutorial simple.<\/p>\n
<\/p>\n
7. What Next? Kubernetes!<\/strong><\/h5>\n
I’m sure you’ve heard of Kubernetes.<\/p>\n
Now what we did in this tutorial is this: we created docker image and hosted it locally. Similarly, we could also push our image to a remote location. For example, Docker Hub<\/a>.<\/p>\n
We can also host our images in Google Cloud. Kubernetes<\/a> is a feature provided by Google for orchestrating containers. So we can have a repository in Google Cloud<\/a> and the push our images there. Then we can run the containers from there. Read a little about Kubernetes here.<\/a><\/p>\n
This is really fun to do! That is what we’ll cover in the next series!<\/p>\n","protected":false},"excerpt":{"rendered":"
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- If your system is Windows 10 Home or any other, then download and install Docker Toolbox here<\/a><\/li>\n
- Create a Dockerfile<\/a><\/li>\n
- Or build the demo app(thymeleaf-app) by following this tutorial.<\/a><\/li>\n