Coder.com•3y ago

Setting up a database in a template

First of all: Coder is running on my server at the office, and I want to host the workspaces on it too with Docker. I've got a PHP project I'm trying to create a template for. It requires a MySQL/MariaDB database to run, so I'm trying to set that up now, but I'm not sure how to go about it. Do I create another terraform resource for it, like:

resource "docker_image" "mariadb" {
  name         = "docker.io/mariadb:latest"
  keep_locally = false
}

resource "docker_container" "mariadb" {
  image = docker_image.mariadb.latest
  name  = "${data.coder_workspace.me.owner}-${data.coder_workspace.me.name}-mariadb"
  ports {
    internal = 3306
    external = 3306
  }
  env = ["MARIADB_ROOT_PASSWORD=elastic"]
}

provider "mysql" {
  endpoint = "localhost:3306"
  username = "root"
  password = "elastic"
}

resource "mysql_database" "app" {
  name = "project_db_name"
}

resource "docker_image" "mariadb" {
  name         = "docker.io/mariadb:latest"
  keep_locally = false
}

resource "docker_container" "mariadb" {
  image = docker_image.mariadb.latest
  name  = "${data.coder_workspace.me.owner}-${data.coder_workspace.me.name}-mariadb"
  ports {
    internal = 3306
    external = 3306
  }
  env = ["MARIADB_ROOT_PASSWORD=elastic"]
}

provider "mysql" {
  endpoint = "localhost:3306"
  username = "root"
  password = "elastic"
}

resource "mysql_database" "app" {
  name = "project_db_name"
}

Or is there another preferred way to do it?

6 Replies

Cian•3y ago

Hi @Skerit most database Docker images have some way of initialising various things through environment variables and such. I see you've already done that with the mariadb image. I don't think there's any real need to create the database as a resource if you're doing it with a Docker image. In fact, I can see that the official MySQL terraform provider is archived https://github.com/hashicorp/terraform-provider-mysql On cloud platforms, yes you'd probably have to create the database instances -- for example, there's an aws_db_instance resource type here: https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/db_instance

Skerit•3y ago

Oh, so my mariadb docker_container is enough, there's no need to setup the provider "mysql" and resource "mysql_database" too? That's good. In my current example the database will always listen to port 3306, so I will only be able to have 1 running workspace at a time. Is there a way to generate a random port number, or should it be set up in another way?

Phorcys•3y ago

Oh, so my mariadb docker_container is enough, there's no need to setup the provider "mysql" and resource "mysql_database" too?

indeed

so I will only be able to have 1 running workspace at a time

No, because each workspace has it's own port space like with regular docker containers

Skerit•3y ago

So each workspace has its own port space, but when I define a docker container like this:

resource "docker_container" "mongodb" {
    image = docker_image.mongodb.latest
    name  = "${data.coder_workspace.me.owner}-${data.coder_workspace.me.name}-mongodb"
    ports {
        internal = 27017
        external = 27017
    }
}

resource "docker_container" "mongodb" {
    image = docker_image.mongodb.latest
    name  = "${data.coder_workspace.me.owner}-${data.coder_workspace.me.name}-mongodb"
    ports {
        internal = 27017
        external = 27017
    }
}

I get this error: Error starting userland proxy: listen tcp4 0.0.0.0:27017: bind: address already in use Which makes sense, because there is another, non-coder MongoDB container exposing that port to the host machine. So how do I make that work? 🤔 Or am I going about this all wrong, and should I create a new Docker image (based on codercom/code-server:latest) that contains all the services I need?

Phorcys•2y ago

this is what I do you'd just be running both your code-server and the mongodb container I don't know if there's an effective way to connect both that would be an interesting thing but yeah, just do this @Skerit is this good to close ?

Skerit•2y ago

Sure!

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Setting up a database in a template