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feat(docker-compose): Allow directory name different from service or component names

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hygienic-books
2022-06-06 04:37:03 +02:00
parent 2540cb5ba8
commit 0ea8efffcd
7 changed files with 104 additions and 26 deletions
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5
README.md
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@@ -28,9 +28,10 @@ Cookiecutter prompts you for whatever info the template needs then generates fil
This is Cookiecutter prompting for info:
```
service []: grafana
project_slug [dir-name]: grafana
service [grafana]:
component_list [grafana]: grafana,nginx
context []: cncf
context [ctx]: cncf
```
The end result is a directory structure that has everything you need to hit the ground running.

87
docker-compose/README.md
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@@ -9,20 +9,73 @@ cookiecutter https://quico.space/Quico/py-cookiecutter-templates.git --directory
Cookiecutter interactively prompts you for the following info, here with example answers:
```
service []: grafana
project_slug [dir-name]: grafana
service [grafana]:
component_list [grafana]: grafana,nginx
context []: cncf
context [ctx]: cncf
```
Done, directory structure and files for your next `docker-compose` project are ready for you to hit the ground running.
## Explanation and terminology
Each `docker-compose` project forms a *__service__* that may consist of either a single or multiple *__components__*.
Your four answers translate as follows into rendered files.
The `service` variable by default is empty. In this example we've chosen to name the service `grafana`. We want `grafana` to consist of two components, namely Grafana itself and Nginx. Syntax for a multi-component `component_list` is a comma-separated list without spaces. The string `grafana,nginx` will be treated as a list of two components. Capitalization doesn't matter, we're lowercasing all strings automatically. The template prefills `component_list` with whatever you previously entered as the `service` name. To create directory structure for a _single-component service_ confirm the default. If `component_list` and `service` are identical directory structure will be that for a _single-component service_.
1. The `project_slug` is used only as directory name. A container named `vault` may be fine but the project directory name `hashicorpvault` might be more descriptive.
```
.
└── hashicorpvault <--- Here
├── build-context
│   ├── docker-data
│   │   └── .gitkeep
│   ├── Dockerfile
...
```
2. The `service` variable by default copies your `project_slug` answer. It's a style decision whether you leave it at that and just hit `Enter`. The service name will come up in rendered `docker-compose.yml` at purely cosmetic locations such as the `networks:` key, `container_name:` and `/opt/docker-data` volume mount presets, here with `ftp` as the service name:
```
services:
mysql:
image: "mysql:${MYSQL_VERSION}"
container_name: "ftp-mysql-${CONTEXT}" <---
networks:
ftp-default: <---
...
volumes:
# - /opt/docker-data/ftp-mysql-${CONTEXT}/... <---
# - /opt/docker-data/ftp-mysql-${CONTEXT}/... <---
# - /opt/docker-data/ftp-mysql-${CONTEXT}/... <---
...
```
The last prompt for a *__context__* is a generic string to help you distinguish deployments. It can be whatever you want such as for example a team name, here `cncf`.
3. Treat `component_list` as the list of Docker images that make up your service. Each `docker-compose` project forms a *__service__* - see above - that consists of either a single or multiple *__components__*. They're your `services:`, your container, volume, variable names etc.:
```
services:
grafana: <---
image: "grafana:${GRAFANA_VERSION}" <---
container_name: "grafana-grafana-${CONTEXT}" <---
...
environment:
# GRAFANA_USER: ${GRAFANA_USER} <---
# GRAFANA_PASSWORD: ${GRAFANA_PASSWORD} <---
...
```
4. The last prompt for a `context` is a generic string to help you distinguish deployments. It can be whatever you want such as for example a team name, here `cncf` which shows up as a preset in an example env file. It defaults to `ctx` just it can't be empty.
```
.
└── grafana
...
└── env
└── fully.qualified.domain.name.example <---
```
Which then looks like:
```
CONTEXT=cncf
...
```
Also check out [the Caveats section](#caveats) at the end to learn what this template does not do well.
## Result
@@ -72,3 +125,27 @@ With an alternative single-component `hashicorpvault` service the result may loo
└── fully.qualified.domain.name.example
```
Check out file contents over in the [examples/hashicorpvault](examples/hashicorpvault) subdir.
## Caveats
Consider Cookiecutter's project directory and rendered files a starting point. It won't do everything perfect.
Imagine if you will a service that consists of [Infinispan](https://infinispan.org/) among other things. In Docker Hub's content-addressable image store Infinispan's location is at `infinispan/server` so you obviously want that exact string with a forward slash to show up in your `docker-compose.yml` as the `image:` key's value, same with your `Dockerfile`. The `image:` key's value comes from what you enter in Cookiecutter's `component_list` prompt. Component strings are then used to also pre-fill the `volumes:` key.
This will cause obvious issues (but the `image:` key is kinda correct):
```
services:
infinispan/server:
image: "infinispan/server:${INFINISPAN/SERVER_VERSION}"
container_name: "cacheman-infinispan/server-${CONTEXT}"
```
This won't cause issues (but you'll have to then go in and manually change the `image:` key to use `infinispan/server`):
```
services:
infinispan:
image: "infinispan:${INFINISPAN_VERSION}"
container_name: "cacheman-infinispan-${CONTEXT}"
```
You're going to want to keep it simply and go with option 2.

2
docker-compose/cookiecutter.json
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@@ -5,6 +5,6 @@
"__service_slug": "{{ cookiecutter.service.lower().replace(' ', '_').replace('-', '_') }}",
"component_list": "{{ cookiecutter.__service_slug }}",
"__component_list_slug": "{{ cookiecutter.component_list.lower().replace(' ', '_').replace('-', '_') }}",
"context": "",
"context": "ctx",
"__context_slug": "{{ cookiecutter.context.lower().replace(' ', '_').replace('-', '_') }}"
}

4
docker-compose/examples/hashicorpvault/build-context/Dockerfile
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@@ -4,10 +4,10 @@
# ARG EXAMPLE_ARG_FOR_DOCKERFILE
# Another env var, this one's needed in the example build step below:
# ARG HASHICORPVAULT_VERSION
# ARG VAULT_VERSION
# Example
# FROM "hashicorpvault:${HASHICORPVAULT_VERSION}"
# FROM "vault:${VAULT_VERSION}"
# RUN apt-get update && \
# apt-get -y install \
# somepackage-6.q16-6-extra && \

8
docker-compose/examples/hashicorpvault/docker-compose.override.yml
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@@ -1,10 +1,10 @@
services:
hashicorpvault-build:
image: "hashicorpvault:${HASHICORPVAULT_VERSION}"
vault-build:
image: "vault:${VAULT_VERSION}"
profiles: ["build"]
build:
context: "build-context/hashicorpvault"
context: "build-context/vault"
dockerfile: Dockerfile
args:
EXAMPLE_ARG_FOR_DOCKERFILE: "${EXAMPLE_ARG_FROM_ENV_FILE}"
HASHICORPVAULT_VERSION: "${HASHICORPVAULT_VERSION}"
VAULT_VERSION: "${VAULT_VERSION}"

22
docker-compose/examples/hashicorpvault/docker-compose.yml
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@@ -1,24 +1,24 @@
services:
hashicorpvault:
image: "hashicorpvault:${HASHICORPVAULT_VERSION}"
container_name: "hashicorpvault-${CONTEXT}"
vault:
image: "vault:${VAULT_VERSION}"
container_name: "vault-${CONTEXT}"
networks:
hashicorpvault-default:
vault-default:
extends:
file: common-settings.yml
service: common-settings
ports:
# - "8080:80"
volumes:
# - /opt/docker-data/hashicorpvault-${CONTEXT}/data/db:/usr/lib/hashicorpvault
# - /opt/docker-data/hashicorpvault-${CONTEXT}/data/logs:/var/log/hashicorpvault
# - /opt/docker-data/hashicorpvault-${CONTEXT}/config:/etc/hashicorpvault
# - /opt/docker-data/vault-${CONTEXT}/data/db:/usr/lib/vault
# - /opt/docker-data/vault-${CONTEXT}/data/logs:/var/log/vault
# - /opt/docker-data/vault-${CONTEXT}/config:/etc/vault
environment:
# HASHICORPVAULT_USER: ${HASHICORPVAULT_USER}
# HASHICORPVAULT_PASSWORD: ${HASHICORPVAULT_PASSWORD}
# VAULT_USER: ${VAULT_USER}
# VAULT_PASSWORD: ${VAULT_PASSWORD}
networks:
hashicorpvault-default:
name: hashicorpvault-${CONTEXT}
vault-default:
name: vault-${CONTEXT}
driver: bridge
driver_opts:
com.docker.network.enable_ipv6: "false"

2
docker-compose/examples/hashicorpvault/env/fully.qualified.domain.name.example vendored
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@@ -4,7 +4,7 @@ CONTEXT=fsf
# Set something sensible here and uncomment
# ---
# HASHICORPVAULT_VERSION=x.y.z
# VAULT_VERSION=x.y.z