You can check if the validator node is running as a systemd service, check logs, and determine if your node is in sync with the chain.
Is the systemd service running?
Check the service with
sudo systemctl status ethermintd
The output should show that the service is active (running).
If the service is not running, check that you have the service file set up correcly: Running a Full Node.
If the service file is set up correctly, try restarting the service
sudo systemctl restart ethermintd
Where are the logs?
You can view the logs with the journalctl command.
journalctl -u ethermintd
View the most recent logs
journalctl -xeu ethermintd
Tail the logs
journalctl -f -u ethermintd
Is my node synced with the chain?
Use the ethermintd command to check sycn status
ethermintd status 2>&1 | jq -r ".SyncInfo"
If catching_up is false, your node is synced.