feat(haproxy): Add config

haproxy/README.md

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+# Docker Compose
+
+## Environment
+
+Prepare an environment file following the example in [env/fqdn_context.env.example](env/fqdn_context.env.example):
+```
+CONTEXT=foodstuffs_hongkong
+DOCKER_SUBNET=172.24.23.0/24
+HAPROXY_VERSION=latest
+```
+
+Var `${DOCKER_SUBNET}` is optional and defaults to `${DOCKER_SUBNET-172.24.23.0/24}`. Treat `CONTEXT` as a team name, purpose or scope. If the same Docker application can run multiple times and serve different tenants then `CONTEXT` is what distinguishes one instance from the other. Here `foodstuffs_hongkong` indicates for example a Hong Kong-based foodstuffs team of some sort.
+
+## Vars
+
+Define Docker Compose variables, use the `COMPOSE_ENV_FILE` defined above in [Environment](#environment):
+```
+export COMPOSE_DIR='/opt/containers' # Or wherever this repo is checked out
+export COMPOSE_FILE="${COMPOSE_DIR}"'/docker-compose.yml'
+export COMPOSE_ENV_FILE=<add accordingly>
+```
+
+Run like so:
+```
+docker compose --file "${COMPOSE_FILE}" --env-file "${COMPOSE_ENV_FILE}" up --detach
+```
+
+Log entries will just be something along the lines of:
+```
+haproxy-CONTEXT  | [NOTICE]   (1) : New worker (8) forked
+haproxy-CONTEXT  | [NOTICE]   (1) : Loading success.
+```

haproxy/build-context/Dockerfile

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+# For the remainder of this Dockerfile EXAMPLE_ARG_FOR_DOCKERFILE will be
+# available with a value of 'must_be_available_in_dockerfile', check out the env
+# file at 'env/fully.qualified.domain.name.example' for reference.
+# ARG EXAMPLE_ARG_FOR_DOCKERFILE
+
+# Another env var, this one's needed in the example build step below:
+# ARG HAPROXY_VERSION
+
+# Example
+# FROM "haproxy:${HAPROXY_VERSION}"
+# RUN apt-get update && \
+#     apt-get -y install \
+#     somepackage-6.q16-6-extra && \
+#     rm -rf /var/lib/apt/lists/*

haproxy/common-settings.yml

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+services:
+    common-settings:
+        environment:
+            TZ: "${TIMEZONE:-Etc/UTC}"
+        logging:
+            driver: "json-file"
+            options:
+                max-size: "10m"
+                max-file: "10"
+                compress: "true"
+        restart: "${RESTARTPOLICY:-unless-stopped}"

haproxy/docker-compose.override.yml

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+services:
+    haproxy-build:
+        image: "haproxy:${HAPROXY_VERSION}"
+        profiles: ["build"]
+        build:
+            context: "build-context/haproxy"
+            dockerfile: Dockerfile
+            args:
+                HAPROXY_VERSION: "${HAPROXY_VERSION}"

haproxy/docker-compose.yml

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+services:
+    haproxy:
+        image: "haproxy:${HAPROXY_VERSION}"
+        container_name: "haproxy-${CONTEXT}"
+        networks:
+            haproxy-default:
+        extends:
+            file: common-settings.yml
+            service: common-settings
+        ports:
+            - 80:80
+            - 443:443
+        volumes:
+            - /opt/docker-data/haproxy-${CONTEXT}/config/haproxy.cfg:/usr/local/etc/haproxy/haproxy.cfg
+
+networks:
+    haproxy-default:
+        name: haproxy-${CONTEXT}
+        driver: bridge
+        driver_opts:
+            com.docker.network.enable_ipv6: "false"
+        ipam:
+            driver: default
+            config:
+                - subnet: ${DOCKER_SUBNET-172.24.23.0/24}

haproxy/env/fqdn_context.env.example

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+# This file is maintained by remco and populated with data from HashiCorp
+# Vault. Changes not done in Vault will be reverted when file gets rendered.
+
+CONTEXT=
+DOCKER_SUBNET=
+HAPROXY_VERSION=