Running nowcasting on a different server

Making use of the nowcasting, the load on your nowcast service may cause performance issues: IRIS Focus may become slower in returning results to users.

You can compensate for this by moving nowcasting to a separate server.

On the new (blank AlmaLinux, non-Focus) machine that will have the nowcast server on it, do the following steps:

Setup firewall rules first.

Set ALLOW_IP to IP address of machine that needs to access nowcast, or set to nothing to allow all machines access:

declare ALLOW_IP=""
declare -i ALLOW_PORT=31004
if systemctl status firewalld &> /dev/null && (( ALLOW_PORT > 0 )); then
if [ "${ALLOW_IP}" != "" ]; then

Limit access to just the machine specified:

firewall-cmd --permanent --zone=public --add-rich-rule="rule family=\"ipv4\" source address=\"${ALLOW_IP}/32\" port protocol=\"tcp\" port=\"${ALLOW_PORT}\" accept" else

Allow everyone access instead:

firewall-cmd --permanent --add-port="${ALLOW_PORT}/tcp"
fi
fi
firewall-cmd --reload

scp the cloud-nowcast-service.tar from the <Focus installation files dir>/k8s/images to the nowcast server machine:
```
scp root@<Focus_machine>:/Focus_installation_files/k8s/images/cloud-nowcast-service.tar .
```

Load and create nowcast container:

podman image load < cloud-nowcast-service.tar
podman run --name nowcast -d -p 31004:31004 com.vaisala.fire/cloud-nowcast-service:7.x.x /app/bin/nowcast-server 31004

where x.x is the number of the version/patch.

Check that you can reach nowcast on local server:

curl --request POST http://localhost:31004/focus-nowcast/api/v2/health; echo

You should see the following output:

{"status":"UP"}

To manage with systemd, use these commands:

podman generate systemd --new --name vaisala-radarsw-nowcast >| /etc/systemd/system/vaisala-radarsw-nowcast.service
chmod 644 /etc/systemd/system/vaisala-radarsw-nowcast.service
systemctl enable --now vaisala-radarsw-nowcast
systemctl status vaisala-radarsw-nowcast

Any time firewall rules are changed, you need to restart the nowcast service with the following command:
```
systemctl restart vaisala-radarsw-nowcast
```
1. Example on restarting without system control:
```
podman stop nowcast
podman start nowcast
```
To view the log, use the following command:
```
podman logs nowcast
```
On the IRIS-Focus machine, check that you can reach nowcast from remote server:
```
curl --request POST http://<nowcast_machine>:31004/focus-nowcast/api/v2/health; echo
```
You should see the following output:
```
{"status":"UP"}
```
Change the line in vsoweb-override.ini (use the hostname where the nowcast is):

nowcast.http.server.url = http://<Focus_machine>:31004/focus-nowcast/api/v2/mvf/

Restart the webapp with this command:

systemctl restart vaisala-radarsw-webapp