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Using systemd for the Validator Node

You can run your validator as a systemd process so that it will automatically restart on server reboots or crashes (and helps to avoid getting slashed!).

Before following this guide you should have already set up your validator by following the How to validate article.

First create a new unit file called polkadot-validator.service in /etc/systemd/system/.

touch /etc/systemd/system/polkadot-validator.service

In this unit file you will write the commands that you want to run on server boot / restart.

[Unit]
Description=Polkadot Validator

[Service]
ExecStart=PATH_TO_POLKADOT_BIN --validator --name SHOW_ON_TELEMETRY
Restart=always
RestartSec=120

[Install]
WantedBy=multi-user.target

WARNING: It's recommended to delay the restart of a node with RestartSec in the case of node crashes. It's possible that when a node crashes, consensus votes in GRANDPA aren't persisted to disk. In this case, there is potential to equivocate when immediately restarting. What can happen is the node will not recognize votes that didn't make it to disk, and will then cast conflicting votes. Delaying the restart will allow the network to progress past potentially conflicting votes, at which point other nodes will not accept them.

To enable this to autostart on bootup run:

systemctl enable polkadot-validator.service

Start it manually with:

systemctl start polkadot-validator.service

You can check that it's working with:

systemctl status polkadot-validator.service

You can tail the logs with journalctl like so:

journalctl -f -u polkadot-validator

Wireguard systemd configuration

You can automatically restart your VPN tunnel between your validator and its sentries using the configuration you have already created in the Set Up a Sentry Node - Public Node guide.

Create a file called wireguard.service in /etc/systemd/system.

touch /etc/systemd/system/wireguard.service

Write the commands needed to auto-start wireguard previously configured as wg0 into the wgo.conf file in the /etc/wireguard/ directory.

[Unit]
Description=Wireguard VPN

[Service]
Type=forking
ExecStart=PATH_TO_WG-QUICK_BIN up wg0

Restart=always

[Install]
WantedBy=multi-user.target

The path to the wg-quick binary on Debian based distributions is usually: /usr/bin/wg-quick. If in doubt, run whereis wg-quick. To enable this to autostart on boot:

systemctl enable wireguard.service

Start it manually with:

systemctl start wireguard.service

You can check that it's working with:

systemctl status wireguard.service

You can tail the logs with journalctl like so:

journalctl -f -u wireguard