Cherry-pick-3.3-618 Installing RKE2/K3s" - EXEC settings not effective with the curl command (suse-edge#952)

* Edited content based on the information (suse-edge#948)

Signed-off-by: Ranjini M N <ranjini.n@suse.com>

* Updated EOF

Co-authored-by: Eduardo Mínguez <e.minguez@gmail.com>

---------

Signed-off-by: Ranjini M N <ranjini.n@suse.com>
Co-authored-by: Eduardo Mínguez <e.minguez@gmail.com>

Author: ranjinimn

asciidoc/guides/metallb-kube-api.adoc

@@ -40,17 +40,25 @@ SSH to the first host and install the wanted distribution in cluster mode.
 For RKE2:
 [,bash]
 ----
-# Export the free IP mentioned above
-export VIP_SERVICE_IP=<ip>
+# As a root user, create the /etc/rancher/rke2/config.yaml config file with the following content:
+
+mkdir -p /etc/rancher/rke2/
+cat <<EOF > /etc/rancher/rke2/config.yaml
+# An example of the config.yaml file for a server node: 
+write-kubeconfig-mode: "0644"
+tls-san:
+  - "${VIP_SERVICE_IP}"
+  - "https://${VIP_SERVICE_IP}.sslip.io"
+EOF
 
-curl -sfL https://get.rke2.io | INSTALL_RKE2_EXEC="server \
- --write-kubeconfig-mode=644 --tls-san=${VIP_SERVICE_IP} \
- --tls-san=https://${VIP_SERVICE_IP}.sslip.io" sh -
- 
+# Install RKE2
+curl -sfL https://get.rke2.io | INSTALL_RKE2_EXEC="server" sh -
+
+# Enable and start the RKE2 service with the configuration specified in the config.yaml file
 systemctl enable rke2-server.service
 systemctl start rke2-server.service
 
-# Fetch the cluster token:
+# Fetch the cluster token to be used later:
 RKE2_TOKEN=$(tr -d '\n' < /var/lib/rancher/rke2/server/node-token)
 ----