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92 lines
2.9 KiB
Markdown
92 lines
2.9 KiB
Markdown
# Docker
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Drone uses the local Docker daemon (at `unix:///var/run/docker.sock`) to execute your builds with 2x concurrency. This section describes how to customize your Docker configuration and concurrency settings using the `DOCKER_*` environment variables.
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Configure a single Docker host (1x build concurrency):
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```bash
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DOCKER_HOST="unix:///var/run/docker.sock"
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```
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## Concurrency
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Configure Drone to run multiple, concurrent builds by increasing the number of registered Docker hosts. Each `DOCKER_HOST_*` environment variable will increase concurrency by 1.
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Configure multiple Docker hosts (4x build concurrency):
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```bash
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DOCKER_HOST_1="unix:///var/run/docker.sock"
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DOCKER_HOST_2="unix:///var/run/docker.sock"
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DOCKER_HOST_3="unix:///var/run/docker.sock"
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DOCKER_HOST_4="unix:///var/run/docker.sock"
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```
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Configure a single, external Docker host (1x build concurrency):
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```bash
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DOCKER_HOST="tcp://1.2.3.4:2376"
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DOCKER_CA="/path/to/ca.pem"
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DOCKER_CERT="/path/to/cert.pem"
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DOCKER_KEY="/path/to/key.pem"
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```
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Configure multiple, external Docker hosts (4x build concurrency using 2 remote servers):
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```bash
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DOCKER_HOST_1="tcp://1.2.3.4:2376"
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DOCKER_HOST_2="tcp://1.2.3.4:2376"
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DOCKER_HOST_3="tcp://4.3.2.1:2376"
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DOCKER_HOST_4="tcp://4.3.2.1:2376"
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DOCKER_CA="/path/to/ca.pem"
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DOCKER_CERT="/path/to/cert.pem"
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DOCKER_KEY="/path/to/key.pem"
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```
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## Remote Servers
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Connecting to remote Docker servers requires TLS authentication for security reasons. You will therefore need to generate your own self-signed certificates. For convenience, we've created the following gist to help generate a certificate: https://gist.github.com/bradrydzewski/a6090115b3fecfc25280
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This will generate the following files:
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* ca.pem
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* cert.pem
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* key.pem
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* server-cert.pem
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* server-key.pem
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Tell Drone where to find the `cert.pem` and `key.pem`:
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```bash
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DOCKER_CERT="/path/to/cert.pem"
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DOCKER_KEY="/path/to/key.pem"
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```
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When running Drone inside Docker, you'll need to mount the volume containing the certificate:
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```bash
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docker run
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--volume /path/to/cert.pem:/path/to/cert.pem \
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--volume /path/to/key.pem:/path/to/key.pem \
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```
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Tell Docker where to find the certificate files. Install the certificates on every remote machine (in `/etc/ssl/docker/`) and update each Docker configuration file (at `/etc/init/drone-dart.conf`) accordingly:
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```bash
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# Use DOCKER_OPTS to modify the daemon startup options.
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DOCKER_OPTS="--tlsverify --tlscacert=/etc/ssl/docker/ca.pem --tlscert=/etc/ssl/docker/server-cert.pem --tlskey=/etc/ssl/docker/server-key.pem -H=0.0.0.0:2376 -H unix:///var/run/docker.sock"
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```
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Verify that everything is configured correctly by connecting to a remote Docker server from our Drone server using the following command:
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```bash
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sudo docker \
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--tls \
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--tlscacert=/path/to/ca.pem \
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--tlscert=/path/to/cert.pem \
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--tlskey=/path/to/key.pem \
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-H="1.2.3.4:2376" version
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```
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