Docker Compose Worker Documentation and Examples (#12737)

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Add documentation for how to configure Synapse with Workers using Docker Compose. Includes example worker config and docker-compose.yaml. Contributed by @Thumbscrew.

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# Setting up Synapse with Workers using Docker Compose
This directory describes how deploy and manage Synapse and workers via [Docker Compose](https://docs.docker.com/compose/).
Example worker configuration files can be found [here](workers).
All examples and snippets assume that your Synapse service is called `synapse` in your Docker Compose file.
An example Docker Compose file can be found [here](docker-compose.yaml).
## Worker Service Examples in Docker Compose
In order to start the Synapse container as a worker, you must specify an `entrypoint` that loads both the `homeserver.yaml` and the configuration for the worker (`synapse-generic-worker-1.yaml` in the example below). You must also include the worker type in the environment variable `SYNAPSE_WORKER` or alternatively pass `-m synapse.app.generic_worker` as part of the `entrypoint` after `"/start.py", "run"`).
### Generic Worker Example
```yaml
synapse-generic-worker-1:
image: matrixdotorg/synapse:latest
container_name: synapse-generic-worker-1
restart: unless-stopped
entrypoint: ["/start.py", "run", "--config-path=/data/homeserver.yaml", "--config-path=/data/workers/synapse-generic-worker-1.yaml"]
healthcheck:
test: ["CMD-SHELL", "curl -fSs http://localhost:8081/health || exit 1"]
start_period: "5s"
interval: "15s"
timeout: "5s"
volumes:
- ${VOLUME_PATH}/data:/data:rw # Replace VOLUME_PATH with the path to your Synapse volume
environment:
SYNAPSE_WORKER: synapse.app.generic_worker
# Expose port if required so your reverse proxy can send requests to this worker
# Port configuration will depend on how the http listener is defined in the worker configuration file
ports:
- 8081:8081
depends_on:
- synapse
```
### Federation Sender Example
Please note: The federation sender does not receive REST API calls so no exposed ports are required.
```yaml
synapse-federation-sender-1:
image: matrixdotorg/synapse:latest
container_name: synapse-federation-sender-1
restart: unless-stopped
entrypoint: ["/start.py", "run", "--config-path=/data/homeserver.yaml", "--config-path=/data/workers/synapse-federation-sender-1.yaml"]
healthcheck:
disable: true
volumes:
- ${VOLUME_PATH}/data:/data:rw # Replace VOLUME_PATH with the path to your Synapse volume
environment:
SYNAPSE_WORKER: synapse.app.federation_sender
depends_on:
- synapse
```
## `homeserver.yaml` Configuration
### Enable Redis
Locate the `redis` section of your `homeserver.yaml` and enable and configure it:
```yaml
redis:
enabled: true
host: redis
port: 6379
# password: <secret_password>
```
This assumes that your Redis service is called `redis` in your Docker Compose file.
### Add a replication Listener
Locate the `listeners` section of your `homeserver.yaml` and add the following replication listener:
```yaml
listeners:
# Other listeners
- port: 9093
type: http
resources:
- names: [replication]
```
This listener is used by the workers for replication and is referred to in worker config files using the following settings:
```yaml
worker_replication_host: synapse
worker_replication_http_port: 9093
```
### Add Workers to `instance_map`
Locate the `instance_map` section of your `homeserver.yaml` and populate it with your workers:
```yaml
instance_map:
synapse-generic-worker-1: # The worker_name setting in your worker configuration file
host: synapse-generic-worker-1 # The name of the worker service in your Docker Compose file
port: 8034 # The port assigned to the replication listener in your worker config file
synapse-federation-sender-1:
host: synapse-federation-sender-1
port: 8034
```
### Configure Federation Senders
This section is applicable if you are using Federation senders (synapse.app.federation_sender). Locate the `send_federation` and `federation_sender_instances` settings in your `homeserver.yaml` and configure them:
```yaml
# This will disable federation sending on the main Synapse instance
send_federation: false
federation_sender_instances:
- synapse-federation-sender-1 # The worker_name setting in your federation sender worker configuration file
```
## Other Worker types
Using the concepts shown here it is possible to create other worker types in Docker Compose. See the [Workers](https://matrix-org.github.io/synapse/latest/workers.html#available-worker-applications) documentation for a list of available workers.

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networks:
backend:
services:
postgres:
image: postgres:latest
restart: unless-stopped
volumes:
- ${VOLUME_PATH}/var/lib/postgresql/data:/var/lib/postgresql/data:rw
networks:
- backend
environment:
POSTGRES_DB: synapse
POSTGRES_USER: synapse_user
POSTGRES_PASSWORD: postgres
POSTGRES_INITDB_ARGS: --encoding=UTF8 --locale=C
redis:
image: redis:latest
restart: unless-stopped
networks:
- backend
synapse:
image: matrixdotorg/synapse:latest
container_name: synapse
restart: unless-stopped
volumes:
- ${VOLUME_PATH}/data:/data:rw
ports:
- 8008:8008
networks:
- backend
environment:
SYNAPSE_CONFIG_DIR: /data
SYNAPSE_CONFIG_PATH: /data/homeserver.yaml
depends_on:
- postgres
synapse-generic-worker-1:
image: matrixdotorg/synapse:latest
container_name: synapse-generic-worker-1
restart: unless-stopped
entrypoint: ["/start.py", "run", "--config-path=/data/homeserver.yaml", "--config-path=/data/workers/synapse-generic-worker-1.yaml"]
healthcheck:
test: ["CMD-SHELL", "curl -fSs http://localhost:8081/health || exit 1"]
start_period: "5s"
interval: "15s"
timeout: "5s"
networks:
- backend
volumes:
- ${VOLUME_PATH}/data:/data:rw # Replace VOLUME_PATH with the path to your Synapse volume
environment:
SYNAPSE_WORKER: synapse.app.generic_worker
# Expose port if required so your reverse proxy can send requests to this worker
# Port configuration will depend on how the http listener is defined in the worker configuration file
ports:
- 8081:8081
depends_on:
- synapse
synapse-federation-sender-1:
image: matrixdotorg/synapse:latest
container_name: synapse-federation-sender-1
restart: unless-stopped
entrypoint: ["/start.py", "run", "--config-path=/data/homeserver.yaml", "--config-path=/data/workers/synapse-federation-sender-1.yaml"]
healthcheck:
disable: true
networks:
- backend
volumes:
- ${VOLUME_PATH}/data:/data:rw # Replace VOLUME_PATH with the path to your Synapse volume
environment:
SYNAPSE_WORKER: synapse.app.federation_sender
depends_on:
- synapse

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worker_app: synapse.app.federation_sender
worker_name: synapse-federation-sender-1
# The replication listener on the main synapse process.
worker_replication_host: synapse
worker_replication_http_port: 9093
worker_listeners:
- type: http
port: 8034
resources:
- names: [replication]
worker_log_config: /data/federation_sender.log.config

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worker_app: synapse.app.generic_worker
worker_name: synapse-generic-worker-1
# The replication listener on the main synapse process.
worker_replication_host: synapse
worker_replication_http_port: 9093
worker_listeners:
- type: http
port: 8034
resources:
- names: [replication]
- type: http
port: 8081
x_forwarded: true
resources:
- names: [client, federation]
worker_log_config: /data/worker.log.config