woodpecker/docs/versioned_docs/version-0.15/30-administration/15-agent-config.md

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# Agent configuration
Agents are configured by the command line or environement variables. At the minimum you need the following information:
```yaml
# docker-compose.yml
version: '3'
services:
woodpecker-agent:
[...]
environment:
+ - WOODPECKER_SERVER=localhost:9000
+ - WOODPECKER_AGENT_SECRET="your-shared-secret-goes-here"
```
The following are automatically set and can be overridden:
- WOODPECKER_HOSTNAME if not set, becomes the OS' hostname
- WOODPECKER_MAX_PROCS if not set, defaults to 1
## Processes per agent
By default the maximum processes that are run per agent is 1. If required you can add `WOODPECKER_MAX_PROCS` to increase your parellel processing on a per-agent basis.
```yaml
# docker-compose.yml
version: '3'
services:
woodpecker-agent:
[...]
environment:
- WOODPECKER_SERVER=localhost:9000
- WOODPECKER_AGENT_SECRET="your-shared-secret-goes-here"
+ - WOODPECKER_MAX_PROCS=4
```
## Filtering agents
When building your pipelines as long as you have set the platform or filter, builds can be made to only run code on certain agents.
```
- WOODPECKER_HOSTNAME=mycompany-ci-01.example.com
- WOODPECKER_FILTER=
```
### Filter on Platform
Only want certain pipelines or steps to run on certain agents with specific platforms? Such as arm vs amd64?
```yaml
# .woodpecker.yml
pipeline:
build:
image: golang
commands:
- go build
- go test
when:
platform: linux/amd64
testing:
image: golang
commands:
- go build
- go test
when:
platform: linux/arm*
```
See [Conditionals Pipeline](../20-usage/20-pipeline-syntax.md#step-when---conditional-execution) syntax for more
## All agent configuration options
Here is the full list of configuration options and their default variables.
### `WOODPECKER_SERVER`
> Default: `localhost:9000`
Configures gRPC address of the server.
### `WOODPECKER_USERNAME`
> Default: `x-oauth-basic`
The gRPC username.
### `WOODPECKER_AGENT_SECRET`
> Default: empty
A shared secret used by server and agents to authenticate communication. A secret can be generated by `openssl rand -hex 32`.
### `WOODPECKER_LOG_LEVEL`
> Default: empty
Configures the logging level. Possible values are `trace`, `debug`, `info`, `warn`, `error`, `fatal`, `panic`, `disabled` and empty.
### `WOODPECKER_DEBUG_PRETTY`
> Default: `false`
Enable pretty-printed debug output.
### `WOODPECKER_DEBUG_NOCOLOR`
> Default: `true`
Disable colored debug output.
### `WOODPECKER_HOSTNAME`
> Default: empty
Configures the agent hostname.
### `WOODPECKER_MAX_PROCS`
> Default: `1`
Configures the number of parallel builds.
### `WOODPECKER_HEALTHCHECK`
> Default: `true`
Enable healthcheck endpoint.
### `WOODPECKER_KEEPALIVE_TIME`
> Default: empty
After a duration of this time of no activity, the agent pings the server to check if the transport is still alive.
### `WOODPECKER_KEEPALIVE_TIMEOUT`
> Default: `20s`
After pinging for a keepalive check, the agent waits for a duration of this time before closing the connection if no activity.
### `WOODPECKER_GRPC_SECURE`
> Default: `false`
Configures if the connection to `WOODPECKER_SERVER` should be made using a secure transport.
### `WOODPECKER_GRPC_VERIFY`
> Default: `true`
Configures if the gRPC server certificate should be verified, only valid when `WOODPECKER_GRPC_SECURE` is `true`.
### `WOODPECKER_BACKEND`
> Default: `auto-detect`
Configures the backend engine to run pipelines on. Possible values are `auto-detect` or `docker`.