[DOKS-Egress-Gateway] Add SSH key example for the egress gateway CRD

[udhay45]

1. Document ssh setup configuration (add ssh key to the setup) for the user When we create the nat-gw via crossplane, I can't ssh to it as we need to add the fingerprint to the userdata. I had to get the fingerprint from UI Console Settings --> Security --> SSH Keys --> copy fingerprint and use it in the nat-gw yaml.

-- forProvider: region: nyc3 size: s-1vcpu-1gb image: ubuntu-20-04-x64 sshKeys:

• bb:bb:bb:bb:bb:bb:bb:bb

2. verify “ssh’ing” works I did this by "ssh root@public_ip_of_NAT_GW -i .ssh/

3. Verify ip_forwarding is enabled "sysctl net.ipv4.ip_forward"

Expected output net.ipv4.ip_forward = 1

4. verify nat is enabled "iptables -L -t nat"

Expected output: root@nat-gw-nyc3-new5:~# iptables -L -t nat Chain PREROUTING (policy ACCEPT) target prot opt source destination

Chain INPUT (policy ACCEPT) target prot opt source destination

Chain OUTPUT (policy ACCEPT) target prot opt source destination

Chain POSTROUTING (policy ACCEPT) target prot opt source destination MASQUERADE all -- 10.108.0.0/20 anywhere. ---> Should see the the VPC network info where you have both NAT GW and the K8s cluster

[v-ctiutiu]

Thanks @udhay45.

Fixed via #56.

Please re-open if the case.