Creating Startup Scripts and Services

To run an instance of Cardano Node, create a bash script to configure options. Also, implement Cardano Node as a systemd service.

Running Cardano Node as a systemd service maximizes the uptime of your stake pool by restarting the stake pool automatically if any stake pool processes may crash, or when the computer reboots.

To create a startup script and service for an instance of Cardano Node:

1. On the computer hosting your block producing node, using a terminal window type the following command to navigate to the folder containing configuration files and scripts related to operating your Cardano node:

cd $NODE_HOME

You set the $NODE_HOME environment variable when Installing GHC and Cabal.

1. To retrieve the values of the $NODE_HOME and $USER environment variables, type:

echo $NODE_HOME
echo $USER

1. In the folder where you navigated in step 1, using a text editor create a file named startCardanoNode.sh and then add the following contents to the file where <NodeHomeValue> is the value of your $NODE_HOME environment variable that you retrieved in step 2:

#!/bin/bash
#
# Set variables to indicate Cardano Node options
#
# Set a variable to indicate the port where the Cardano Node listens
PORT=6000
# Set a variable to indicate the local IP address of the computer where Cardano Node runs
# 0.0.0.0 listens on all local IP addresses for the computer
HOSTADDR=0.0.0.0
# Set a variable to indicate the file path to your topology file
TOPOLOGY=<NodeHomeValue>/topology-legacy.json
# Set a variable to indicate the folder where Cardano Node stores blockchain data
DB_PATH=<NodeHomeValue>/db
# Set a variable to indicate the path to the Cardano Node socket for Inter-process communication (IPC)
SOCKET_PATH=<NodeHomeValue>/db/socket
# Set a variable to indicate the file path to your main Cardano Node configuration file
CONFIG=<NodeHomeValue>/config.json
#
# Run Cardano Node using the options that you set using variables
#
/usr/local/bin/cardano-node run --topology ${TOPOLOGY} --database-path ${DB_PATH} --socket-path ${SOCKET_PATH} --host-addr ${HOSTADDR} --port ${PORT} --config ${CONFIG}

You configured the topology-legacy.json file when Configuring Legacy Stake Pool Topology. You downloaded the config.json file when Downloading Configuration Files. For more details on options for the cardano-node run command, see the topic How to run cardano-node in the Cardano Developer Portal.

1. Save and close the startCardanoNode.sh file.

2. To set execute permissions for the startCardanoNode.sh file, type:

chmod +x $NODE_HOME/startCardanoNode.sh

1. To create the folder where Cardano Node stores blockchain data, type:

mkdir $NODE_HOME/db

1. To run Cardano Node as a service, using a text editor create a file named cardano-node.service and then add the following contents to the file where <UserValue> is the value of your $USER environment variable and <NodeHomeValue> is the value of your $NODE_HOME environment variable that you retrieved in step 2:

# The Cardano Node service (part of systemd)
# file: /etc/systemd/system/cardano-node.service  
  
 [Unit]
Description       = Cardano Node Service
Wants             = network-online.target
After             = network-online.target  
  
 [Service]
User              = <UserValue>
Type              = simple
WorkingDirectory  = <NodeHomeValue>
ExecStart         = /bin/bash -c '<NodeHomeValue>/startCardanoNode.sh'
KillSignal        = SIGINT
RestartKillSignal = SIGINT
TimeoutStopSec    = 300
LimitNOFILE       = 32768
Restart           = always
RestartSec        = 5
SyslogIdentifier  = cardano-node  
  
 [Install]
WantedBy          = multi-user.target

1. Save and close the cardano-node.service file.

2. To move the cardano-node.service file to the folder /etc/systemd/system and set file permissions, type:

sudo mv $NODE_HOME/cardano-node.service /etc/systemd/system/cardano-node.service
sudo chmod 644 /etc/systemd/system/cardano-node.service

1. To start Cardano Node as a service when the computer boots, type:

sudo systemctl daemon-reload
sudo systemctl enable cardano-node.service

1. Repeat steps 1 to 10 on each computer hosting a relay node in your stake pool configuration.

Managing Services

To help administer an instance of Cardano Node running as a systemd service, use the following commands.

To view the status of the Cardano Node service, type:

sudo systemctl status cardano-node

To restart the Cardano Node service, type:

sudo systemctl reload-or-restart cardano-node

To stop the Cardano Node service, type:

sudo systemctl stop cardano-node

To display and filter logs, type one of the following commands, for example:

journalctl --unit=cardano-node --follow
journalctl --unit=cardano-node --since=yesterday
journalctl --unit=cardano-node --since=today
journalctl --unit=cardano-node --since='2022-07-29 00:00:00' --until='2022-07-29 12:00:00'

📈 Improving Cardano Node Performance

If you are not satisfied with the performance of an instance of Cardano Node, then see the topic Configuring Runtime Options.