StrongSwan IKEv2 VPN setup with IBM Kubernetes Service

IBM Cloud Kubernetes service --> initial connection to on-prem Strong Swan IPSEC

These scripts are based on this cool tutorial article: https://www.digitalocean.com/community/tutorials/how-to-set-up-an-ikev2-vpn-server-with-strongswan-on-ubuntu-16-04 (thanks DigitalOcean!)

This Readme edited from the original fork to work with IBM cloud kubentes cluser IBM Cloud softlayer machine

Following the pattern mentioned below

https://developer.ibm.com/dwblog/2018/securing-containers-iks-kubernetes/

Deploy with Pre Shared Key auth

This script would uuidgen a PSK and print it out to console, where you can copy and hit enter to continue.

After you ssh your_vpn_machine, just run this:

curl -L https://raw.githubusercontent.com/ahmadsayed/ikev2_vpn/master/ikev2-deploy-psk.sh -o ~/deploy.sh 

#Edit the deploy.sh and update the following 
# leftsubnet, with softlayer private subnet
# rightsubnet, append IKS workernodes private subnet
chmod +x ~/deploy.sh && ~/deploy.sh

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Deploy Strongswan on IBM Cloud kubernetes Service

after starting your cluster run the following command download config.yaml file, and update the following

remote.gateway with softlayer public IP

remote.subnet with softlayer private subnet

local.subnet append IKS worker node private subnet privateIPtoPing with Softlayer machine private IP

helm install -f config.yaml --name=vpn ibm/strongswan

For detailes steps and trouble shooting follow the below URL https://console.bluemix.net/docs/containers/cs_vpn.html#vpn

To validate if everything went right

helm test vpn

Expected result should be

RUNNING: vpn-strongswan-check-state
PASSED: vpn-strongswan-check-state
RUNNING: vpn-strongswan-check-config
PASSED: vpn-strongswan-check-config
RUNNING: vpn-strongswan-ping-remote-ip-1
PASSED: vpn-strongswan-ping-remote-ip-1
RUNNING: vpn-strongswan-ping-remote-gw
PASSED: vpn-strongswan-ping-remote-gw
RUNNING: vpn-strongswan-ping-remote-ip-2
PASSED: vpn-strongswan-ping-remote-ip-2

Note: I find this website (https://mxtoolbox.com/subnetcalculator.aspx), it will be helful to calculate and convert subnet to CIDR