4.Learning docker-compose for WebLogic with examples

Learning docker-compose for WebLogic with examples

The docker-compose is one of the docker integration tool. it works based on yml or yaml file. The yml files are easy to read plain like English text. It is developed alternative to JSON files, both are used to store the key, value pairs and hierarchical structured data. To run docker-compose command in the current directory there should be  docker-compose.yml file must be exist.

Prerequisites for docker-compose

• well awareness of docker
• YML syntax
• docker network

docker-compose build with Example

Dockerfile is used to build the docker image that should be present in the current directory.

Create docker-compose.yml file

Lets create the docker-compose.yml file for WebLogic Domain container which uses 1221-appdeploy image. The AdminServer port exposed as 7001 from the container and on left side host port opened with 7001. The container should run the command/shell script. here we can select startWebLogic.sh as starting shell script to be executed when container launched.

Here the docker Compose syntax is simple human readable. alternative to JSON. meta-data.

wls:
 image: 1221-appdeploy
 ports:
  - "7001:7001"
 command:
  - startWebLogic.sh

Now we are ready for Running the container with docker-compose command which will start the container and keep  it running state.

docker-compose up 

To run the docker container in the background we will use -d option

docker-compose up -d 

docker-compose for WebLogic appdeployment container

We have same number of commands as in docker for docker-compose. And it is more powerful than docker commands. because it can start multiple containers with single command.

How to check the WebLogic log files from docker host?

Docker container logs can be viewed from the docker host machine using the following command

  docker-compose logs --tail="all"

  docker-compose logs -f
   

How to get docker-compose process list?

We can get the list of process that are running on docker deamon.

docker-compose ps

docker-compose ps for WebLogic

How to bring down docker-compose containers?

To stop the container we can use stop option

docker-compose stop

To destroy and dispose you can use down option.

docker-compose down

It will stop and remove the container.

Destroying the container will loss all the changes in the last domain configuration. Better to have host volume shared or have a separate container to have WebLogic domains for backup.