OpenVPN @ Kubernetes, Secure LAN access. Keep it buttoned up!

k8 by example -- straight to the point, simple execution.

Easy start:

make deploy install

<push your docker image>

make issue-cert NAME=myuser-1

Getting Started

Export your configuration variables (keeps you from having to pass these on each command):

export NS=infra
export CN=k8.yomateo.io
export REMOTE_TAG=gcr.io/bebuildin/cluster-1/infra-openvpn:latest
```

First we need to generate the certificates used for issuing client certs:
```sh

$ make prepare
docker volume create --name openvpn-data
openvpn-data

$ make pki
docker run --net=none -v openvpn-data:/etc/openvpn --rm -it -e EASYRSA_KEY_SIZE=1024 kylemanna/openvpn ovpn_initpki nopass yes

WARNING!!!

You are about to remove the EASYRSA_PKI at: /etc/openvpn/pki
and initialize a fresh PKI here.

...

$ make config
Disable default push of 'block-outside-dns'
Processing PUSH Config: 'dhcp-option DNS 10.15.240.10'
Processing PUSH Config: 'route 10.12.0.0 255.255.0.0'
Processing PUSH Config: 'route 10.15.0.0 255.255.0.0'
Processing PUSH Config: 'dhcp-option DOMAIN cluster.local'
Processing PUSH Config: 'dhcp-option DOMAIN svc.cluster.local'
Processing PUSH Config: 'dhcp-option DOMAIN default.svc.cluster.local'
Successfully generated config

Now you can build the openvpn docker image with configs baked into it:

$ make build push-gcloud
docker build --rm --tag proliant:1.0.0 .

Sending build context to Docker daemon 92.16 kB

Step 1/2 : FROM kylemanna/openvpn:2.4
 ---> 532821c851ac

Step 2/2 : COPY openvpn/server /etc/openvpn
 ---> Using cache
 ---> 137c013cd054

Successfully built 137c013cd054
Successfully tagged proliant:1.0.0

docker tag proliant:1.0.0 gcr.io/streaming-platform-devqa/cluster-2/infra-openvpn:latest
gcloud docker -- push gcr.io/streaming-platform-devqa/cluster-2/infra-openvpn:latest

The push refers to repository [gcr.io/streaming-platform-devqa/cluster-2/infra-openvpn]

679835a0c90c: Layer already exists
b8a94757e349: Layer already exists
2c2c4b7741e1: Layer already exists
74a92dc69120: Layer already exists
0e7ecc5cec9e: Layer already exists
5bef08742407: Layer already exists

latest: digest: sha256:8bface219796f32f0e6507d6a391a7d35a5c4dbd0794dcc213cbe3594f280b81 size: 1571

Now we just need to deploy our kubernetes resources using the new docker image!

$ make deploy

deployment "openvpn" unchanged
service "openvpn" unchanged

Generate certificates

This will run inside a docker container and store your cert data (CA, etc..) using a docker volume.

make issue-myclient-123

Your vpn client config will be in the current directory when finished.

Cleanup

You can delete all resources deployed and data by running

make rollback clean

DNS Resolution

It even works on windows :o

PS C:\Windows\system32> nslookup kubernetes
Server:  kube-dns.kube-system.svc.cluster.local
Address:  10.15.240.10

Non-authoritative answer:
Name:    kubernetes.default.svc.cluster.local
Address:  10.15.240.1

PS C:\Windows\system32> nslookup kubernetes.default
Server:  kube-dns.kube-system.svc.cluster.local
Address:  10.15.240.10

Non-authoritative answer:
Name:    kubernetes.default.svc.cluster.local
Address:  10.15.240.1

PS C:\Windows\system32> nslookup kubernetes.default.svc
Server:  kube-dns.kube-system.svc.cluster.local
Address:  10.15.240.10

Non-authoritative answer:
Name:    kubernetes.default.svc.cluster.local
Address:  10.15.240.1

PS C:\Windows\system32> nslookup kubernetes.default.svc.cluster.local
Server:  kube-dns.kube-system.svc.cluster.local
Address:  10.15.240.10

Non-authoritative answer:
Name:    kubernetes.default.svc.cluster.local
Address:  10.15.240.1

PS C:\Windows\system32> nslookup google.com
Server:  kube-dns.kube-system.svc.cluster.local
Address:  10.15.240.10

Non-authoritative answer:
Name:    google.com
Addresses:  2607:f8b0:4001:c14::8a
          74.125.124.138
          74.125.124.139
          74.125.124.113
          74.125.124.102
          74.125.124.101
          74.125.124.100

See also

• https://github.com/kylemanna/docker-openvpn/blob/master/docs/backup.md
• https://community.openvpn.net/openvpn/wiki/Topology