Briefly describe how to install Tomcat image and deploy web project in Docker

1. Install Tomcat

1. Find the tomcat image on Docker Hub

docker search tomcat 

2. Pull the official image

docker pull tomcat

Wait for the download to complete, it may take some time.

3. View all docker images

docker images

4. Start the tomcat image

Note: The former is the external access port: The latter is the container internal port

docker run -d -p 8080:8080 tomcat

Note: The former is the external access port: The latter is the container internal port. The following command can start Tomcat in the background
-d: Run the container in the background and return the container ID;
-i: Run the container in interactive mode, usually used with -t;
-t: reallocate a pseudo input terminal for the container, usually used together with -i;

docker run –d -p 8080:8080 tomcat

The startup is successful as follows:

5. View running containers

docker ps

Enter the ip and port to view the tomcat homepage:

2. Deploy your own web project to Tomcat

1. Upload the war package

2. Create and edit "Dockerfile" with the following content:

from tomcat
MAINTAINER *********@163.com 
RUN rm -rf /usr/local/tomcat/webapps/*
COPY button.war /usr/local/tomcat/webapps
ENV TZ=Asia/Shanghai
RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone

illustrate:

from tomcat #your tomcat mirror MAINTAINER *********@163.com #author COPY button.war /usr/local/tomcat/webapps #place it in tomcat's webapps directory

3. Generate a new image

docker build -t button:v1 .

4. Start a new image

docker run -d -p 8080:8080 button:v1

5. Check the started image

You can add the parameter -itd to start tomcat in the background and view the started image in the following way

docker ps

6. To view the projects in tomcat, you can use the following command to enter the tomcat image:

docker exec -it ******* /bin/bash #****** is the container id (CONTAINER_ID)

After we enter the image, when we want to modify some parameters, we generally need to install a text editor, taking vim as an example:
Since the download address is an overseas address, the download speed is very slow and may be interrupted, so make the following configuration:

mv /etc/apt/sources.list /etc/apt/sources.list.bak
  echo "deb http://mirrors.163.com/debian/ jessie main non-free contrib" >/etc/apt/sources.list
  echo "deb http://mirrors.163.com/debian/ jessie-proposed-updates main non-free contrib" >>/etc/apt/sources.list
  echo "deb-src http://mirrors.163.com/debian/ jessie main non-free contrib" >>/etc/apt/sources.list
  echo "deb-src http://mirrors.163.com/debian/ jessie-proposed-updates main non-free contrib" >>/etc/apt/sources.list

Then update
apt update
Now we can install the software we need, such as vim
apt install vim

7. Enter the IP and port to view

8. You can view the log of the specified container

docker logs -f container id

9. After deploying the web project, the time when the docker container and the host, the docker container and the tomcat application print logs may differ by 8 hours from our current time. You can add the following configuration:

① When starting the container, mount the system time into the container to solve the problem of inconsistency between the Docker container and the host time, as shown below:
Adding parameters

-v /etc/localtime:/etc/localtime:ro

The complete command is as follows:

sudo docker run -d --name button-api -p 8080:8080 -v /etc/localtime:/etc/localtime:ro button-api:v1

② The docker container and the tomcat application print log time are inconsistent. After starting the tomcat container, enter the "bin" directory of tomcat, modify the catalina.sh file and add the following content to the first line after the comment:

JAVA_OPTS="$JAVA_OPTS -Dfile.encoding=UTF8 -Duser.timezone=GMT+08"

As shown in the following figure:

After saving the changes, restart the Docker container.
Restart method:
Use "docker ps" to query the container ID and restart it using the following command:

docker restart container id

This will resolve the issue.

This is the end of this article about briefly installing Tomcat image with Docker and deploying web projects. For more related content about installing Tomcat image with Docker and deploying it, please search for previous articles on 123WORDPRESS.COM or continue to browse the following related articles. I hope you will support 123WORDPRESS.COM in the future!