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A Resource is a network-accessible external service.
A Resource is defined in convox.yml and linked to one or more Services.
resources:
main:
type: postgres
services:
web:
resources:
- main
The following Resource types are currently available:
mariadbmemcachedmysqlpostgispostgresredisLinking a Resource to a Service causes an environment variable to be injected into Processes of that Service based on the name of the Resource.
The credential details will be stored in the environment variables, and you can use the FQDN (URL) or each credential separately.
For example, a postgres resource named main (as in the example above) would be injected like this:
MAIN_URL=postgres://username:password@host.name:port/database
MAIN_USER=username
MAIN_PASS=password
MAIN_HOST=host.name
MAIN_PORT=port
MAIN_NAME=database
By default, any Resources you define will be satisfied by starting a containerized version on your Rack. This allows you to get up and running as quickly as possible and provides a low-cost solution and more effective usage of your Rack.
In your production environment, or for particular usage requirements, you may wish to replace the containerized Resources with a managed cloud service for durability. For instance, on AWS you may wish to utilize RDS to provide you with a Database, or on GCP you may wish to use Memorystore in place of a containerized Redis instance.
Resource Overlays provide you with a simple and effective way to maintain the cheaper and efficient containerized Resources on the environments you wish, while easily switching them out for the cloud-provider managed services on those environments that require them.
If you wish to replace any of those containerized Resources on a Rack, to stop them being initiated, you can manually set a matching environment variable on your App. The corresponding Resource will then not be started by Convox on that Rack.
$ convox env set MAIN_URL=postgres://username:password@postgres-instance1.123456789012.us-east-1.rds.amazonaws.com:5432/database -r production-rack
Setting MAIN_URL... OK
Release: RABCDEFGHI
By doing this, a containerized main resource will now no longer be started on the production-rack for this app. The service will instead communicate with the managed database.
In addition to containerized resources, Convox v3 allows the creation of database resources (mariadb, mysql, and postgres) via AWS RDS. This integration provides enhanced durability and managed service benefits. Below are the basic configurations required for using AWS RDS resources.
AWS RDS resources are specified with a rds- prefix followed by the database type (e.g., rds-mariadb, rds-mysql, rds-postgres). Here is a general example of how to define AWS RDS resources:
resources:
database:
type: rds-postgres
options:
storage: 100
class: db.t3.large
version: 13
services:
web:
resources:
- database
For detailed configuration options and defaults for each type of AWS RDS resource, refer to the specific resource documentation pages:
If an application is deleted, it will delete its created RDS databases. We advise enabling deletionProtection for any production or critical databases to avoid any accidental removal. If a database is imported, the database will not be removed if the application is deleted and it will need to be manually deleted.
Read replicas allow you to create read-only copies of your database to improve read scalability and reliability.
To configure a read replica, use the readSourceDB option to point to another database using the name you’ve chosen in the convox.yml:
resources:
mydb:
type: rds-postgres
options:
storage: 100
class: db.t3.large
version: 13
dbrr:
type: rds-postgres
options:
readSourceDB: "#convox.resources.mydb"
services:
web:
resources:
- mydb
- dbrr
Immutable Attributes for Read Replicas:
To promote a read replica to an active primary DB, remove the readSourceDB option from the convox.yml and redeploy.
Resource linking works the same with read replicas, meaning environment variables for both primary and read replica databases will be created based on their respective YAML names.
Database import allows you to integrate any RDS managed database into Convox, whether it was initially created by Convox or not.
resources:
mydb-import:
type: rds-postgres
options:
import: mydb-rtest-rc6-7924r-postgres-rds-check
masterUserPassword: ${MYDBPASS}
services:
web:
resources:
- mydb-import
Usage:
import option with the masterUserPassword before deploying.import option is set, the database will act as a passive linked access database.import option and redeploy to manage the database through Convox.import is set, no other configured options will be considered. If import is removed, the application will have management control over the RDS database, and the masterUserPassword no longer needs to be configured.You can set the master user password using convox env set before deploying:
$ convox env set MYDBPASS=my_secure_password -a myapp
Setting MYDBPASS... OK
Release: RABCDEFGHI
Snapshots allow you to restore a database from a specific point in time.
resources:
db-from-snap:
type: rds-postgres
options:
storage: 10
snapshot: test-v3-rds-snapshot-postgres
version: 13
services:
web:
resources:
- db-from-snap
Usage:
snapshot option with the snapshot identifier and ensure the version matches the engine version of the snapshot.snapshot option and redeploy to enable options management from the convox.yml.Immutable Attributes for Snapshots:
$ convox resources -a myapp
NAME TYPE URL
main postgres postgres://username:password@host.name:port/database
$ convox resources info main -a myapp
Name main
Type postgres
URL postgres://username:password@host.name:port/database
$ convox resources url main -a myapp
postgres://username:password@host.name:port/database
$ convox resources console main -a myapp
psql (11.5 (Debian 11.5-1+deb10u1), server 10.5 (Debian 10.5-2.pgdg90+1))
Type "help" for help.
database=#
$ convox resources proxy main -a myapp
Proxying localhost:5432 to host.name:port
Proxying allows you to connect tools on your local machine to Resources running inside the Rack.
$ convox resources export main -f /tmp/db.sql
Exporting data from main... OK
$ convox resources import main -f /tmp/db.sql
Importing data to main... OK
