Configuration via LCP.json

Each service in your Liferay Cloud environments has an LCP.json file that you can use to configure the service. You can configure properties like the service ID, memory, number of CPUs, environment variables, volumes, and much more.

This table lists and describes the properties you can add in LCP.json:

Field	Type	Default Value	Description
id	String	random	The service ID
image	String	""	The service image from Docker Hub
env	Object	undefined	Environment variables
loadBalancer	Object	{}	Declaration of exposed ports and domains
cpu	Number	1	Number of CPUs
scale	Number	1	Starting number of instances
memory	Number	512	Amount of memory (MB)
volumes	Object	undefined	Paths to persist data
readinessProbe	Object	{ "timeoutSeconds": 5 }	Service readiness check
livenessProbe	Object	{ "timeoutSeconds": 5 }	Service liveness check
dependencies	Array	[]	Dependency deployment order
kind	String	Deployment	Deployment type (e.g, Deployment or StatefulSet)
strategy	Object	{ "type": "RollingUpdate" }	Deployment strategy (e.g, RollingUpdate or Recreate)
ports	Array	[]	Declaration of ports and protocols
environments	Object	{}	Environment-specific configurations
deploy	Boolean	true	Whether the service will be deployed for the specified environment. Only use this property inside the environments property; not at the root level. See the sample LCP.json file.
autoscale	Object	{ "cpu": 80, "memory": 80 }	The target average utilization for CPU and memory in auto-scaling. For more information about how this works with auto-scaling, see Auto-scaling.

Usage

Here’s an example LCP.json file that uses all the properties:

{
  "id": "myservice",
  "image": "liferaycloud/example",
  "env": {
    "DB_USER": "root",
    "DB_PASSWORD": "pass123"
  },
  "loadBalancer": {
    "cdn": true,
    "targetPort": 3000,
    "customDomains": ["example.com"],
    "ssl": {
      "key": "...",
      "crt": "..."
    }
  },
  "cpu": 2,
  "scale": 2,
  "memory": 2048,
  "volumes": {
    "storage": "/opt/storage"
  },
  "livenessProbe": {
    "timeoutSeconds": 5,
    "httpGet": {
      "path": "/status",
      "port": 3000
    },
    "initialDelaySeconds": 40,
    "periodSeconds": 5,
    "successThreshold": 5
  },
  "readinessProbe": {
    "timeoutSeconds": 5,
    "exec": {
      "command": ["cat", "/tmp/healthy"]
    },
    "initialDelaySeconds": 40,
    "periodSeconds": 5
  },
  "dependencies": ["service1", "service2"],
  "kind": "StatefulSet",
  "strategy": {
    "type": "RollingUpdate"
  },
  "ports": [
    {
      "port": 3400,
      "targetPort": 7000,
      "protocol": "TCP"
    },
    {
      "port": 9000,
      "targetPort": 8000,
      "protocol": "TCP",
      "external": true
    }
  ],
  "environments": {
    "prd": {
      "memory": 4096,
      "cpu": 6
    },
    "dev": {
      "deploy": false
    }
  },
  "autoscale": {
    "cpu": 90,
    "memory": 90
  }
}

The environments Configuration

The environments configuration allows for environment-specific overrides to the LCP.json configuration.

For example, the CI service should only be deployed to the infra environment, so this environments configuration overrides the behavior ("deploy": false) specifically for the infra environment:

{
  "id": "ci",
  "memory": 8192,
  "cpu": 4,
  "deploy": false,
  "environments": {
    "infra": {
      "deploy": true
    }
  }
}

Overriding JSON Objects

For JSON object configurations (such as a loadBalancer configuration), specify only the specific fields that you want to override per environment. Any other fields are inherited from the existing configuration by default.

In this example, the environments configuration disables the CDN for the dev environment, but keeps the target port of 80 for all environments.

{
  "id": "webserver",
  "memory": 512,
  "cpu": 2,
  "loadBalancer": {
    "targetPort": 80,
    "cdn": true
  },
  "environments": {
    "dev": {
      "loadBalancer": {
        "cdn": false
      }
    }
  }
}

Overriding JSON Arrays

Unlike JSON objects, if you override a JSON array in an environments configuration, you must define the whole array in the override. Any elements of the array that you don’t include are not included in the environment-specific result.

In this example overriding the ports array, the environments configuration configures the uat environment with only one port (but two for all other environments).

{
  "id": "database",
  "memory": 1024,
  "cpu": 2,
  "ports": [
    {
      "port": 3306,
      "external": false
    },
    {
      "port": 3000,
      "external": false
    }
  ],
  "environments": {
    "uat": {
      "ports": [
        {
          "port": 3306,
          "external": true
        }
      ]
    }
  }
}