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docker-quickstart.md

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Docker quickstart

We first discuss how to run a Hedera Services network on your local machine with Docker Compose. This consists of sourcing the image either from GCR or a local build, and then docker-compose up.

Next, we look in more detail at the services-node Docker image, covering its usage and limitations.

Sourcing the image

The services-node image can be built locally from the top-level directory in this repository, or pulled from Google Container Registry (GCR).

Prefer the latter until you want to test a change you have made to the source code.

From GCR

Clone this repository:

git clone [email protected]:hashgraph/hedera-services.git
cd hedera-services

You can now start the network.

Building locally

First, clone this repository:

git clone [email protected]:hashgraph/hedera-services.git
cd hedera-services

Second, choose a tag for your build. The tag will be added to the image as the contents of the file /opt/hedera/services/.VERSION. A reasonable tag is the output of git describe --tags --always --dirty; for example, "oa-release-r5-rc6-13-gf18d2ff77-dirty". Ensure the Docker Compose .env file has an empty registry prefix and your tag:

TAG=oa-release-r5-rc6-13-gf18d2ff77-dirty
REGISTRY_PREFIX=

Third, build the image with an empty registry prefix and the TAG from your .env file:

docker build -t services-node:oa-release-r5-rc6-13-gf18d2ff77-dirty .

This is a multi-stage build that could take several minutes, depending on your environment. If you wish to use the git describe output as your tag, you might consider a script such as the compose-build.sh in this repository to combine the second and third steps here.

Starting the Compose network

Run:

docker-compose up

The aggregated logs should end with lines such as:

...
node_2      | 2020-04-29 15:05:28.814 INFO  133  ServicesMain - Now current platform status = ACTIVE in HederaNode#2.
node_0      | 2020-04-29 15:05:28.815 INFO  133  ServicesMain - Now current platform status = ACTIVE in HederaNode#0.
node_1      | 2020-04-29 15:05:28.854 INFO  133  ServicesMain - Now current platform status = ACTIVE in HederaNode#1.

Notice that the Hedera Services and Platform logs for each node are externalized under paths of the form compose-network/node0/output/.

During the initial startup, the network creates system accounts 0.0.1 through 0.0.100. It sets the key for each account to a KeyList of size one with a well-known Ed25519 keypair. The network reads the keypair in a legacy format from here, but the same keypair is available in PEM format using the PKCS8 encoding here (the passphrase is passphrase).

Even more explicitly, the 32-byte hex-encoded private and public keys of the Ed25519 keypair are:

Public: 0aa8e21064c61eab86e2a9c164565b4e7a9a4146106e0a6cd03a8c395a110e92
Private: 91132178e72057a1d7528025956fe39b0b847f200ab59b2fdd367017f3087137

You can now run operations against your local network using any HAPI client. For example:

./mvnw install -DskipTests
cd test-clients
../mvnw exec:java -Dexec.mainClass=com.hedera.services.bdd.suites.compose.LocalNetworkCheck -Dexec.cleanupDaemonThreads=false

(This client uses account 0.0.2 as the default payer, and is aware of the above keypair via its configuration in spec-default.properties under the startupAccounts.path key).

Stopping or reinitializing the Compose network

As you run operations against the local network, each node will periodically save its state using a combination of PostgreSQL tables under compose-network/pgdata/ and state files under, for example, compose-network/node0/saved/com.hedera.services.ServicesMain/0/hedera/.

To stop the network, use Ctrl+C (or docker-compose stop if running with detached containers).

Given a clean shutdown of the containers, when you restart with docker-compose start, the network will load from its last saved state. In general, for this to work correctly, you should precede shutting down the network by submitting a Freeze transaction; e.g. via the FreezeDockerNetwork client.

If you have a problem restarting the network after stopping, you can re-initialize it via:

docker-compose down
rm -rf compose-network/

Understanding the Docker image

Usage

In general, the services-node image will be run with three bind mounts---one to provide the configuration and bootstrap assets; one to externalize the saved state data; and one to externalize the Hedera Services and Platform logs. For example:

  docker run -d --name node0 \
    -v "${PATH_TO_CONFIG}:/opt/hedera/services/config-mount" \
    -v "${PATH_TO_STATE_DATA}:/opt/hedera/services/services/data/saved" \
    -v "${PATH_TO_LOGS}:/opt/hedera/services/services/output" \
    -p 50211:50211 \
    services-node

Note that the container must have routes to the other network nodes listed in config.txt, and the PostgreSQL server given by dbConnection.host in settings.txt.

Limitations

We created this image for development and proof-of-concept use cases. It does not include features such as log management, health checks, metrics, config template support, key management, or resilient startup scripts; all of which would be desirable for a production use case. The image also serves the gRPC API only on port 50211, without TLS.

We suggest using the image only in enviroments such as the Docker Compose network defined by the docker-compose.yml in this repository.