Docker: simplest practice notes

: This article mainly introduces Docker: the simplest practical notes. if you are interested in the PHP Tutorial, refer to it. Let's begin the handover today and summarize some things.

Environment:

You have installed several images, including Tomcat.

Create a directory to create an image with a WEB application, such as sys-webapp:
Go to this directory and create a Dockerfile with the following content:

FROM tomcat:latestCOPY sys.war /usr/local/tomcat/webapps/sys.warCMD ["catalina.sh","run"] 

Then, use SFTP to upload our sys. war to the current directory. Run the following command (note that the current directory is located next to it ):

docker build -t tomcat/sys-webapp.

-T specifies the tag. This will generate a new Image, which can be viewed using the docker images command.

Run the following command:

docker run -d--name sys -p8000:8080 tomcat/sys-webapp

-D is run in the background.-name is used for subsequent operations.-p specifies the port ing (local port: Container Port) and then the image name.

Now we can access port 10.250.251.20: 8000 to see the deployed application.

Run the following command to start a container with the Port 8001 ing:

docker run -d--name sys2 -p8001:8080 tomcat/sys-webapp

Then, configure a pool in Nginx:

upstream sys-webapp-pool {   ip_hash;   server10.250.251.20:8000;   server10.250.251.20:8001;}   

In fact, Docker is very convenient to use, but in practice, we still have something to configure, such as specifying the CPU cores for the image during build, memory limit.

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The above introduces Docker: the simplest practice notes, including some content, hope to be helpful to friends who are interested in PHP tutorials.