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Preparing the Server

Resource#

For production, we recommend using server with a minimum of 8GB of memory and 80GB of disk space.

Storage Driver#

Each Docker installation may have different storage drivers depending on the host's OS. Check the storage driver used by the Docker daemon using docker info. Here's an example of the output:

Server Version: 18.06.1-ce
Storage Driver: overlay2
 Backing Filesystem: extfs
 Supports d_type: true
 Native Overlay Diff: true

From the output above, the storage driver is set to overlay2. Refer to this doc to see supported storage drivers.

By default, each container is set to have 10GB of disk size. For OpenDJ containers, this may not be large enough. There are two ways to increase the container disk size:

  1. Set the option globally in /etc/docker/daemon.json (this will be applied to all containers).

    {
    "storage-driver": "devicemapper",
    "storage-opts": [
        "dm.basesize=20G"
    ]
}

    Make sure the Docker daemon service is restarted.

  2. Set the option locally when running the container.

    docker run --storage-opts dm.basesize=20G gluufederation/wrends:4.0.1_02

Please note that the ability to change the disk size for container depends on storage driver.

Log Rotation for Docker Container#

By default, the log driver is set to json-file, which means that a container's log file is written to the disk under the /var/lib/docker/containers directory. As a result, when using the default log driver json-file, the log file will grow and eventually fill the disk. To mitigate this issue, the administrator can change the log driver or customize the log-opts to rotate the container log by creating /etc/docker/daemon.json, if it does not already exist. See the example below:

{
    "log-driver": "json-file",
    "log-opts": {
        "max-size": "10m",
        "max-file": "3"
    }
}

The administrator can change how many log files are created per container (max-file option) and how big each file is (max-size option).

Note

Any modification in /etc/docker/daemon.json requires a service restart, such as systemctl restart docker.