This example demonstrates how to set up a scaleable dotCMS docker reference implementation cluster on Amazon's Linux 2 using docker-compose. It is intended as an example and not a perscription for running dotCMS in docker in production environments.
- Starts dotCMS as a single node, and then scale it up to multiple nodes.
- Is specific for running docker in Amazon's Linux 2 AMI.
- Other linux distros will have different steps in order to configure their docker environments.
- Shows you how to (optionally) build dotCMS from the a development branch of dotCMS.
- Uses this the docker-compose file found dotCMS Docker Github repo.
Please click the sections below for detailed instructions and docker commands.
1. Start an Amazon Linux 2 Instance
Start up a new instance, and wait until the instance is ready.
Virtual Hardware Requirements
- Minimum Hardware:
- 2 Processors
- 8GB RAM
- The t3a.xlarge configuration is the most economical, but may not have enough resources for a heavily-used or production server.
- Make sure the following ports are open in your security group:
2. Update the AWS Instance
Perform an ssh to login to the AWS instance, and fro the command line, run the commands :
## Update and enable Amazon Extras sudo yum update -y sudo amazon-linux-extras install epel -y ## Install needed app/libs for docker/docker-compose sudo yum install docker haveged gcc libffi-devel python3 python3-devel openssl-devel -y ## Start haveged (collects entropy for /dev/random) sudo systemctl start haveged sudo systemctl enable haveged ## set elasticsearch virtual memory settings ## Elasticsearch will not start without this sudo sysctl -w vm.max_map_count=262144 sudo sysctl -w fs.file-max=100000 ## make sure the settings stick sudo sh -c "echo 'vm.max_map_count=262144' >> /etc/sysctl.conf" sudo sh -c "echo 'fs.file-max=100000' >> /etc/sysctl.conf" sudo sysctl -p ## add the ec2-user to docker sudo usermod -a -G docker ec2-user ## edit docker file limits sudo sh -c "echo \"OPTIONS='--default-ulimit nofile=65536:65536'\" >> /etc/sysconfig/docker" ## create a docker group and join it newgrp docker ## Start/Enable Docker sudo systemctl enable docker sudo systemctl start docker ## Install pip / docker-compose curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py python3 get-pip.py --user ~/.local/bin/pip install docker-compose ## set docker-compose permissions sudo cp ~/.local/bin/docker-compose /usr/local/bin/docker-compose sudo chmod +x /usr/local/bin/docker-compose ## symbolic link docker-compose to your path sudo ln -s /usr/local/bin/docker-compose /usr/bin/docker-compose ## test that it works docker-compose --version ## make data directory sudo mkdir -p /data/dotcms sudo chmod -R 777 /data ## Change to your work directory cd /data/dotcms ## Chose how you want to start dotCMS using ## the example dotCMS docker-compose files ## Start with a demo site curl -o docker-compose.yml https://dotcms.com/run/demo ## OR ## Start with an empty site # curl -o docker-compose.yml https://dotcms.com/run/clean ## Fire up dotCMS and tail the logs docker-compose up -d && docker-compose logs -f
Once you have completed the steps above, you should see dotCMS start up normally. You can access dotCMS at your instance's IP address on port 8082, e.g.
(Optional) Pre-Install a dotCMS License
To pre-install a dotCMS license pack, edit your
docker-compose.yml file to install the license pack file into the Docker image.
- Find the section of the docker-compose.yml file for the
- In the
volumes:section, uncomment the appropriate line for either a license file or license pack.
- Edit the path in the uncommented line to point to your license file or license pack.
You may instead manually install a license pack after the Docker image is running (please see below).
(Optional) Check the Status of the Docker Container
All normal docker and docker-compose commands may be used, where:
- The name or identifier of the container may be used with docker commands (e.g.
- The name of the container in the stack matches the name of that container within the docker-compose file (e.g.
The following docker and docker-compose commands may be useful to manage and check the status of the docker containers:
|Operation||Command||Examples (if appropriate)|
|View a list of running docker containers|
|Connect to any of the containers in the stack|
|Copy files between the docker images and the host|
|Shut down dotCMS but leave the database running|
(Optional) Manually Install a dotCMS License
If you have not pre-installed a license, you can now log into the dotCMS back-end and upload a license pack. For more information, please see the License Management documentation.
Finish: Stop the Instance
When you are finished working with your dotCMS docker instance, you can stop the environment by running: