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KubeVPN云原生开发环境

联合创作 · 2023-09-27

KubeVPN 是一个云原生开发工具，可以在本地连接云端 kubernetes 网络的工具，可以在本地直接访问远端集群的服务。也可以在远端集群访问到本地服务，便于调试及开发。同时还可以使用开发模式，直接在本地使用 Docker 将远程容器运行在本地。

功能

链接到集群网络

➜  ~ kubevpn connect
get cidr from cluster info...
get cidr from cluster info ok
get cidr from cni...
get cidr from svc...
get cidr from svc ok
traffic manager not exist, try to create it...
pod [kubevpn-traffic-manager] status is Pending
Container Reason Message

pod [kubevpn-traffic-manager] status is Pending
Container     Reason            Message
control-plane ContainerCreating
vpn           ContainerCreating
webhook       ContainerCreating

pod [kubevpn-traffic-manager] status is Running
Container     Reason           Message
control-plane ContainerRunning
vpn           ContainerRunning
webhook       ContainerRunning

update ref count successfully
port forward ready
your ip is 223.254.0.101
tunnel connected
dns service ok

---------------------------------------------------------------------------
    Now you can access resources in the kubernetes cluster, enjoy it :)
---------------------------------------------------------------------------

有这个提示出来后, 当前 terminal 不要关闭，新打开一个 terminal, 执行新的操作

➜  ~ kubectl get pods -o wide
NAME                                     READY   STATUS      RESTARTS   AGE     IP             NODE          NOMINATED NODE   READINESS GATES
details-7db5668668-mq9qr                 1/1     Running     0          7m      172.27.0.199   172.30.0.14   <none>           <none>
kubevpn-traffic-manager-99f8c8d77-x9xjt  1/1     Running     0          74s     172.27.0.207   172.30.0.14   <none>           <none>
productpage-8f9d86644-z8snh              1/1     Running     0          6m59s   172.27.0.206   172.30.0.14   <none>           <none>
ratings-859b96848d-68d7n                 1/1     Running     0          6m59s   172.27.0.201   172.30.0.14   <none>           <none>
reviews-dcf754f9d-46l4j                  1/1     Running     0          6m59s   172.27.0.202   172.30.0.14   <none>           <none>
➜  ~ ping 172.27.0.206
PING 172.27.0.206 (172.27.0.206): 56 data bytes
64 bytes from 172.27.0.206: icmp_seq=0 ttl=63 time=49.563 ms
64 bytes from 172.27.0.206: icmp_seq=1 ttl=63 time=43.014 ms
64 bytes from 172.27.0.206: icmp_seq=2 ttl=63 time=43.841 ms
64 bytes from 172.27.0.206: icmp_seq=3 ttl=63 time=44.004 ms
64 bytes from 172.27.0.206: icmp_seq=4 ttl=63 time=43.484 ms
^C
--- 172.27.0.206 ping statistics ---
5 packets transmitted, 5 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 43.014/44.781/49.563/2.415 ms
➜  ~ kubectl get services -o wide
NAME          TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)    AGE     SELECTOR
details       ClusterIP   172.27.255.92    <none>        9080/TCP   9m7s    app=details
productpage   ClusterIP   172.27.255.48    <none>        9080/TCP   9m6s    app=productpage
ratings       ClusterIP   172.27.255.154   <none>        9080/TCP   9m7s    app=ratings
reviews       ClusterIP   172.27.255.155   <none>        9080/TCP   9m6s    app=reviews
➜  ~ curl 172.27.255.48:9080
<!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">

域名解析功能

➜  ~ 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">

短域名解析功能

➜  ~ 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">
...

反向代理

➜  ~ kubevpn proxy deployment/productpage
got cidr from cache
traffic manager not exist, try to create it...
pod [kubevpn-traffic-manager] status is Running
Container     Reason           Message
control-plane ContainerRunning
vpn           ContainerRunning
webhook       ContainerRunning

update ref count successfully
Waiting for deployment "productpage" rollout to finish: 1 out of 2 new replicas have been updated...
Waiting for deployment "productpage" rollout to finish: 1 out of 2 new replicas have been updated...
Waiting for deployment "productpage" rollout to finish: 1 out of 2 new replicas have been updated...
Waiting for deployment "productpage" rollout to finish: 1 old replicas are pending termination...
Waiting for deployment "productpage" rollout to finish: 1 old replicas are pending termination...
deployment "productpage" successfully rolled out
port forward ready
your ip is 223.254.0.101
tunnel connected
dns service ok

---------------------------------------------------------------------------
    Now you can access resources in the kubernetes cluster, enjoy it :)
---------------------------------------------------------------------------

package main

import (
	"io"
	"net/http"
)

func main() {
	http.HandleFunc("/", func(writer http.ResponseWriter, request *http.Request) {
		_, _ = io.WriteString(writer, "Hello world!")
	})
	_ = http.ListenAndServe(":9080", nil)
}
➜  ~ curl productpage:9080
Hello world!%
➜  ~ curl productpage.default.svc.cluster.local:9080
Hello world!%

反向代理支持 service mesh

支持 HTTP, GRPC 和 WebSocket 等, 携带了指定 header "a: 1" 的流量，将会路由到本地

➜  ~ kubevpn proxy deployment/productpage --headers a=1
got cidr from cache
traffic manager not exist, try to create it...
pod [kubevpn-traffic-manager] status is Running
Container     Reason           Message
control-plane ContainerRunning
vpn           ContainerRunning
webhook       ContainerRunning

update ref count successfully
Waiting for deployment "productpage" rollout to finish: 1 out of 2 new replicas have been updated...
Waiting for deployment "productpage" rollout to finish: 1 out of 2 new replicas have been updated...
Waiting for deployment "productpage" rollout to finish: 1 out of 2 new replicas have been updated...
Waiting for deployment "productpage" rollout to finish: 1 old replicas are pending termination...
Waiting for deployment "productpage" rollout to finish: 1 old replicas are pending termination...
deployment "productpage" successfully rolled out
port forward ready
your ip is 223.254.0.101
tunnel connected
dns service ok

---------------------------------------------------------------------------
    Now you can access resources in the kubernetes cluster, enjoy it :)
---------------------------------------------------------------------------

➜  ~ 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">
<meta name="viewport" content="width=device-width, initial-scale=1">
...
➜  ~ curl productpage:9080 -H "a: 1"
Hello world!%

本地进入开发模式

将 Kubernetes pod 运行在本地的 Docker 容器中，同时配合 service mesh, 拦截带有制定 header 的流量到本地，或者所有的流量到本地。这个开发模式依赖于本地 Docker .

➜  ~ kubevpn -n kube-system --headers a=1 -p 9080:9080 -p 80:80 dev deployment/authors
got cidr from cache
update ref count successfully
traffic manager already exist, reuse it
Waiting for deployment "authors" rollout to finish: 1 old replicas are pending termination...
Waiting for deployment "authors" rollout to finish: 1 old replicas are pending termination...
deployment "authors" successfully rolled out
port forward ready
tunnel connected
dns service ok
tar: removing leading '/' from member names
/var/folders/4_/wt19r8113kq_mfws8sb_w1z00000gn/T/3264799524258261475:/var/run/secrets/kubernetes.io/serviceaccount
tar: Removing leading '/' from member names
tar: Removing leading '/' from hard link targets
/var/folders/4_/wt19r8113kq_mfws8sb_w1z00000gn/T/4472770436329940969:/var/run/secrets/kubernetes.io/serviceaccount
tar: Removing leading '/' from member names
tar: Removing leading '/' from hard link targets
/var/folders/4_/wt19r8113kq_mfws8sb_w1z00000gn/T/359584695576599326:/var/run/secrets/kubernetes.io/serviceaccount
Created container: authors_kube-system_kubevpn_a7d82
Wait container authors_kube-system_kubevpn_a7d82 to be running...
Container authors_kube-system_kubevpn_a7d82 is running on port 9080/tcp:32771 now
Created container: nginx_kube-system_kubevpn_a7d82
Wait container nginx_kube-system_kubevpn_a7d82 to be running...
Container nginx_kube-system_kubevpn_a7d82 is running now
/opt/microservices # ls
app
/opt/microservices # ps -ef
PID   USER     TIME  COMMAND
    1 root      0:00 ./app
   10 root      0:00 nginx: master process nginx -g daemon off;
   32 root      0:00 /bin/sh
   44 101       0:00 nginx: worker process
   45 101       0:00 nginx: worker process
   46 101       0:00 nginx: worker process
   47 101       0:00 nginx: worker process
   49 root      0:00 ps -ef
/opt/microservices # apk add curl
fetch https://dl-cdn.alpinelinux.org/alpine/v3.14/main/x86_64/APKINDEX.tar.gz
fetch https://dl-cdn.alpinelinux.org/alpine/v3.14/community/x86_64/APKINDEX.tar.gz
(1/4) Installing brotli-libs (1.0.9-r5)
(2/4) Installing nghttp2-libs (1.43.0-r0)
(3/4) Installing libcurl (7.79.1-r5)
(4/4) Installing curl (7.79.1-r5)
Executing busybox-1.33.1-r3.trigger
OK: 8 MiB in 19 packages
/opt/microservices # curl localhost:9080
404 page not found
/opt/microservices # curl localhost:9080/health
{"status":"Authors is healthy"}/opt/microservices # exit
prepare to exit, cleaning up
update ref count successfully
clean up successful

此时本地会启动两个 container, 对应 pod 容器中的两个 container, 并且共享端口, 可以直接使用 localhost:port 的形式直接访问另一个 container, 并且, 所有的环境变量、挂载卷、网络条件都和 pod 一样, 真正做到与 kubernetes 运行环境一致。

➜  ~ docker ps
CONTAINER ID        IMAGE                   COMMAND                  CREATED             STATUS              PORTS                                        NAMES
de9e2f8ab57d        nginx:latest            "/docker-entrypoint.…"   5 seconds ago       Up 5 seconds                                                     nginx_kube-system_kubevpn_e21d8
28aa30e8929e        naison/authors:latest   "./app"                  6 seconds ago       Up 5 seconds        0.0.0.0:80->80/tcp, 0.0.0.0:9080->9080/tcp   authors_kube-system_kubevpn_e21d8
➜  ~

如果你想指定在本地启动容器的镜像, 可以使用参数 --docker-image, 当本地不存在该镜像时, 会从对应的镜像仓库拉取。如果你想指定启动参数，可以使用 --entrypoint 参数，替换为你想要执行的命令，比如 --entrypoint /bin/bash, 更多使用参数，请参见 kubevpn dev --help.

DinD ( Docker in Docker ) 在 Docker 中使用 kubevpn

如果你想在本地使用 Docker in Docker (DinD) 的方式启动开发模式, 由于程序会读写 /tmp 目录，您需要手动添加参数 -v /tmp:/tmp, 还有一点需要注意, 如果使用 DinD 模式，为了共享容器网络和 pid, 还需要指定参数 --network

例如:

docker run -it --privileged -v /var/run/docker.sock:/var/run/docker.sock -v /tmp:/tmp -v /Users/naison/.kube/config:/root/.kube/config naison/kubevpn:v1.1.21
➜  ~ docker run -it --privileged -c authors -v /var/run/docker.sock:/var/run/docker.sock -v /tmp:/tmp -v /Users/naison/.kube/config:/root/.kube/config naison/kubevpn:v1.1.21
root@4d0c3c4eae2b:/# hostname
4d0c3c4eae2b
root@4d0c3c4eae2b:/# kubevpn -n kube-system --image naison/kubevpn:v1.1.21 --headers user=naison --network container:4d0c3c4eae2b --entrypoint /bin/bash  dev deployment/authors

----------------------------------------------------------------------------------
    Warn: Use sudo to execute command kubevpn can not use user env KUBECONFIG.
    Because of sudo user env and user env are different.
    Current env KUBECONFIG value:
----------------------------------------------------------------------------------

got cidr from cache
traffic manager not exist, try to create it...
pod [kubevpn-traffic-manager] status is Pending
Container Reason Message

pod [kubevpn-traffic-manager] status is Pending
Container     Reason            Message
control-plane ContainerCreating
vpn           ContainerCreating
webhook       ContainerCreating

pod [kubevpn-traffic-manager] status is Running
Container     Reason           Message
control-plane ContainerRunning
vpn           ContainerRunning
webhook       ContainerRunning

update ref count successfully
Waiting for deployment "authors" rollout to finish: 1 old replicas are pending termination...
Waiting for deployment "authors" rollout to finish: 1 old replicas are pending termination...
deployment "authors" successfully rolled out
port forward ready
tunnel connected
dns service ok
tar: removing leading '/' from member names
/tmp/3122262358661539581:/var/run/secrets/kubernetes.io/serviceaccount
tar: Removing leading '/' from member names
tar: Removing leading '/' from hard link targets
/tmp/7677066538742627822:/var/run/secrets/kubernetes.io/serviceaccount
latest: Pulling from naison/authors
Digest: sha256:2e7b2d6a4c6143cde888fcdb70ba091d533e11de70e13e151adff7510a5d52d4
Status: Downloaded newer image for naison/authors:latest
Created container: authors_kube-system_kubevpn_c68e4
Wait container authors_kube-system_kubevpn_c68e4 to be running...
Container authors_kube-system_kubevpn_c68e4 is running now
Created container: nginx_kube-system_kubevpn_c68e7
Wait container nginx_kube-system_kubevpn_c68e7 to be running...
Container nginx_kube-system_kubevpn_c68e7 is running now
/opt/microservices # ps -ef
PID   USER     TIME  COMMAND
    1 root      0:00 {bash} /usr/bin/qemu-x86_64 /bin/bash /bin/bash
   60 root      0:07 {kubevpn} /usr/bin/qemu-x86_64 kubevpn kubevpn dev deployment/authors -n kube-system --image naison/kubevpn:v1.1.21 --headers user=naison --parent
   73 root      0:00 {tail} /usr/bin/qemu-x86_64 /usr/bin/tail tail -f /dev/null
   80 root      0:00 {nginx} /usr/bin/qemu-x86_64 /usr/sbin/nginx nginx -g daemon off;
   92 root      0:00 {sh} /usr/bin/qemu-x86_64 /bin/sh /bin/sh
  156 101       0:00 {nginx} /usr/bin/qemu-x86_64 /usr/sbin/nginx nginx -g daemon off;
  158 101       0:00 {nginx} /usr/bin/qemu-x86_64 /usr/sbin/nginx nginx -g daemon off;
  160 101       0:00 {nginx} /usr/bin/qemu-x86_64 /usr/sbin/nginx nginx -g daemon off;
  162 101       0:00 {nginx} /usr/bin/qemu-x86_64 /usr/sbin/nginx nginx -g daemon off;
  164 root      0:00 ps -ef
/opt/microservices # ls
app
/opt/microservices # apk add curl
fetch https://dl-cdn.alpinelinux.org/alpine/v3.14/main/x86_64/APKINDEX.tar.gz
fetch https://dl-cdn.alpinelinux.org/alpine/v3.14/community/x86_64/APKINDEX.tar.gz
(1/4) Installing brotli-libs (1.0.9-r5)
(2/4) Installing nghttp2-libs (1.43.0-r0)
(3/4) Installing libcurl (7.79.1-r5)
(4/4) Installing curl (7.79.1-r5)
Executing busybox-1.33.1-r3.trigger
OK: 8 MiB in 19 packages
/opt/microservices # curl localhost:80
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
html { color-scheme: light dark; }
body { width: 35em; margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif; }
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>

<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>

<p><em>Thank you for using nginx.</em></p>
</body>
</html>
/opt/microservices # ls
app
/opt/microservices # exit
prepare to exit, cleaning up
update ref count successfully
ref-count is zero, prepare to clean up resource
clean up successful
root@4d0c3c4eae2b:/# exit
exit

支持多种协议

  • TCP
  • UDP
  • ICMP
  • GRPC
  • WebSocket
  • HTTP
  • ...

支持三大平台

  • macOS
  • Linux
  • Windows

Windows 下需要安装 PowerShell

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