Docker image set up

Pre-install

This document covers how to prepare a system to run Lisk Core as a Docker image-based container. To run Lisk in Docker a user must first install the Docker engine. Additionally, it is recommended to install Docker Compose for convenience.

Firstly, determine if your platform can run Docker as described below.

Supported platforms

  • Ubuntu

  • MacOS

  • Windows

To install Docker Compose, please refer to the Docker Compose installation guide.

Configure Docker, in order that it can be run without sudo rights: linux post install

Install make using your package manager. For example, use apt-get if running Ubuntu as shown below:

sudo apt-get install curl make

Please refer to Docker installation for Mac. Please note that Docker for Mac already includes Docker Compose. Install make using XCode.

Please refer to Docker installation for Windows Please note that Docker for Windows includes Docker Compose.

Ports

Mandatory: Always open the WebSocket port of your desired network, to enable communication with other peer nodes.

Optional: Open the corresponding HTTP port for your network, to make your node’s API reachable. For more information, see the diagram on the Interact with the API page.

To connect to the desired network with Lisk Core, please ensure that the corresponding ports listed below are open:

Network HTTP WebSocket

Mainnet

8000

8001

Testnet

7000

7001

Devnet

4000

5000

These are the default ports for connecting with the network. They can be altered later in the config.json file.

These are the default ports for connecting with the network, they can be altered later in .env.

Create a new user

To run and manage a Lisk Core node in the future, please create a separate lisk user as described below:

  • Ubuntu

  • MacOS

The lisk user itself does not need any sudo rights to run the Lisk Core.

It is sufficient to create a group docker, and then add the newly created user to that group. In order to enable the user to use Docker, (see: https://docs.docker.com/install/linux/linux-postinstall/).

sudo adduser lisk              (1)
sudo groupadd docker           (2)
sudo usermod -aG docker lisk   (3)
1 Create a new user.
2 Create docker group.
3 Add the user to docker group.

It is not necessarily required to set up a lisk user, especially when you are running a local instance for development purposes.

However, if it is required then it is recommended to create the user using the macOS GUI: https://support.apple.com/en-gb/guide/mac-help/mtusr001/mac

Installation

Get configuration and makefile

Clone the Lisk Core Repository as shown below:

sudo -u lisk -i                                    (1)
git clone https://github.com/LiskHQ/lisk-core.git  (2)
cd lisk-core/docker                                (3)
git checkout master                                (4)
1 Switch to Lisk user.
2 Clone the repository.
3 Navigate into the docker directory.
4 Checkout the master branch for the last stable version of Lisk Core.

This contains a directory docker with the following files:

  • .env.development

  • .env.mainnet

  • .env.testnet

  • docker-compose.make.yml: used by make coldstart.

  • docker-compose.override.yml: use this file to overwrite LISK_ variables, (empty by default).

  • docker-compose.redis.yml: enable cache, (optional).

  • docker-compose.yml

  • Makefile

The .env-files are templates with network specific environment variables which are described below:

Set environment variables

To connect to the Lisk network, the environment variables need to be set accordingly.

Before setting the variables, you may wish to edit them in the respective .env.<network> file.

It is recommended to change the password for the database, which is stored in ENV_LISK_DB_PASSWORD.

To install a specific version of Lisk Core, set the ENV_LISK_VERSION to the respective version.

After adjusting them, copy the environment variables to a file called .env as shown below:

cp .env.<network> .env

Where <network> stands for the Lisk network you want to connect to.

Coldstart application

Option 1: Makefile

It is recommended to use the Makefile. Makefile provides a convenient way to synchronize from a snapshot:

make coldstart  (1)
1 This will download and restore from a recent blockchain snapshot.

If you wish to synchronize your node starting from the genesis block, it might take a significant amount of time until your local node will be fully synchronized with the blockchain network. It is recommended to use make coldstart in the case whereby it is necessary to use your node quickly.

make (1)
1 This will synchronise from the genesis block on first startup.

Option 2: Docker-Compose

docker-compose up -d (1)
docker-compose ps    (2)
docker-compose logs  (3)
1 Initializes Lisk Core.
2 Displays the status of Lisk Core.
3 Displays the logs.

Verify

The final step here is to verify that your node is connected, and is synchronized with the network, e.g. inquiring about your node’s status from using the API as shown below:

docker-compose exec lisk curl http://localhost:<PORT>/api/node/status --header "accept: application/json"

Where <PORT> is the network specific httpPort of your node.

The result should appear as shown below:

{
  "meta": {},
  "data": {
    "broadhash": "ca930994bc1a6a92a47afb7310e3d9903f5e98ce56a6c5fdf444ba34f24c1543",
    "consensus": 94,
    "currentTime": 1558358294074,
    "secondsSinceEpoch": 94249094,
    "height": 8306047,
    "loaded": true,
    "networkHeight": 8306047,
    "syncing": false,
    "transactions": {
      "confirmed": 928836,
      "unconfirmed": 0,
      "unprocessed": 0,
      "unsigned": 0,
      "total": 928836
    }
  },
  "links": {}
}

When your node is synchronized, the values of networkHeight and height should be (nearly) equal.

To fully verify that your node is synchronized with the network, go to the Lisk Explorer (Mainnet) or Lisk Explorer (Testnet) and compare the network height in the explorer with the height of your node. Again, they should be (nearly) equal.

If necessary, use the different explorer tools for further verification, such as comparing the last forged blocks on the chain.

From this point your node should now be fully functional.

To proceed to the next step, please see Docker image management to learn how to manage your node.

Post-installation (optional)

Ubuntu

If it is required to set up a service for Lisk Core that takes care of restarting it automatically after the server restarts, this can be accomplished by executing the following commands below:

# /etc/systemd/system/docker-compose-lisk.service

[Unit]
Description=Docker Compose Application Service
Requires=docker.service
After=docker.service

[Service]
WorkingDirectory=/home/lisk/lisk-core/docker/testnet/
ExecStart=/usr/local/bin/docker-compose up
TimeoutStartSec=0
Restart=on-failure
StartLimitIntervalSec=60
StartLimitBurst=3

[Install]
WantedBy=multi-user.target

For delegates: It is still required to enable forging manually after a restart of Lisk Core.

To enable the service, execute the following command below:

systemctl enable docker-compose-lisk

To check the service, execute the following command below:

systemctl status docker-compose-lisk.service (1)
sudo journalctl -u docker-compose-lisk.service (2)
1 Displays the status of the service.
2 Displays the logs of the service.