KubeVPN

1.install krew

1. download and install krew
1. Add the $HOME/.krew/bin directory to your PATH environment variable.

export PATH="${KREW_ROOT:-$HOME/.krew}/bin:$PATH"

1. Run kubectl krew to check the installation

kubectl krew list

2. Download from kubevpn source from github

kubectl krew index add kubevpn https://gitclone.com/github.com/kubenetworks/kubevpn.git
kubectl krew install kubevpn/kubevpn
kubectl kubevpn

3. Deploy VPN in some cluster

Using different config to access different cluster and deploy vpn in that k8s.

kubectl kubevpn connect

If you wanna connect other k8s …

kubectl kubevpn connect --kubeconfig /root/.kube/xxx_config

Your terminal should look like this:

➜  ~ kubectl kubevpn connect
Password:
Starting connect
Getting network CIDR from cluster info...
Getting network CIDR from CNI...
Getting network CIDR from services...
Labeling Namespace default
Creating ServiceAccount kubevpn-traffic-manager
Creating Roles kubevpn-traffic-manager
Creating RoleBinding kubevpn-traffic-manager
Creating Service kubevpn-traffic-manager
Creating MutatingWebhookConfiguration kubevpn-traffic-manager
Creating Deployment kubevpn-traffic-manager

Pod kubevpn-traffic-manager-66d969fd45-9zlbp is Pending
Container     Reason            Message
control-plane ContainerCreating
vpn           ContainerCreating
webhook       ContainerCreating

Pod kubevpn-traffic-manager-66d969fd45-9zlbp is Running
Container     Reason           Message
control-plane ContainerRunning
vpn           ContainerRunning
webhook       ContainerRunning

Forwarding port...
Connected tunnel
Adding route...
Configured DNS service
+----------------------------------------------------------+
| Now you can access resources in the kubernetes cluster ! |
+----------------------------------------------------------+

already connected to cluster network, use command kubectl kubevpn status to check status

➜  ~ kubectl kubevpn status
ID Mode Cluster   Kubeconfig                  Namespace            Status      Netif
0  full ops-dev   /root/.kube/zverse_config   data-and-computing   Connected   utun0

use pod productpage-788df7ff7f-jpkcs IP 172.29.2.134

➜  ~ kubectl get pods -o wide
NAME                                       AGE     IP                NODE              NOMINATED NODE  GATES
authors-dbb57d856-mbgqk                    7d23h   172.29.2.132      192.168.0.5       <none>         
details-7d8b5f6bcf-hcl4t                   61d     172.29.0.77       192.168.104.255   <none>         
kubevpn-traffic-manager-66d969fd45-9zlbp   74s     172.29.2.136      192.168.0.5       <none>         
productpage-788df7ff7f-jpkcs               61d     172.29.2.134      192.168.0.5       <none>         
ratings-77b6cd4499-zvl6c                   61d     172.29.0.86       192.168.104.255   <none>         
reviews-85c88894d9-vgkxd                   24d     172.29.2.249      192.168.0.5       <none>

use ping to test connection, seems good

➜  ~ ping 172.29.2.134
PING 172.29.2.134 (172.29.2.134): 56 data bytes
64 bytes from 172.29.2.134: icmp_seq=0 ttl=63 time=55.727 ms
64 bytes from 172.29.2.134: icmp_seq=1 ttl=63 time=56.270 ms
64 bytes from 172.29.2.134: icmp_seq=2 ttl=63 time=55.228 ms
64 bytes from 172.29.2.134: icmp_seq=3 ttl=63 time=54.293 ms
^C
--- 172.29.2.134 ping statistics ---
4 packets transmitted, 4 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 54.293/55.380/56.270/0.728 ms

use service productpage IP 172.21.10.49

➜  ~ kubectl get services -o wide
NAME                      TYPE        CLUSTER-IP     PORT(S)              SELECTOR
authors                   ClusterIP   172.21.5.160   9080/TCP             app=authors
details                   ClusterIP   172.21.6.183   9080/TCP             app=details
kubernetes                ClusterIP   172.21.0.1     443/TCP              <none>
kubevpn-traffic-manager   ClusterIP   172.21.2.86    84xxxxxx0/TCP        app=kubevpn-traffic-manager
productpage               ClusterIP   172.21.10.49   9080/TCP             app=productpage
ratings                   ClusterIP   172.21.3.247   9080/TCP             app=ratings
reviews                   ClusterIP   172.21.8.24    9080/TCP             app=reviews

use command curl to test service connection

➜  ~ curl 172.21.10.49:9080
<!DOCTYPE html>
<html>
  <head>
    <title>Simple Bookstore App</title>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">

seems good too~

if you wanna resolve domain

Domain resolve

a Pod/Service named productpage in the default namespace can successfully resolve by following name:

productpage
productpage.default
productpage.default.svc.cluster.local

➜  ~ curl productpage.default.svc.cluster.local:9080
<!DOCTYPE html>
<html>
  <head>
    <title>Simple Bookstore App</title>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">

Short domain resolve

To access the service in the cluster, service name or you can use the short domain name, such as productpage

➜  ~ curl productpage:9080
<!DOCTYPE html>
<html>
  <head>
    <title>Simple Bookstore App</title>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
...

Disclaimer: This only works on the namespace where kubevpn-traffic-manager is deployed.