最受关注的 Cilium Service Mesh 到底怎么玩？ - 上手实践
大家好，我是张晋涛。
Cilium 是一个基于 eBPF 技术，用于为容器工作负载间提供安全且具备可观测性的网络连接的开源软件。
如果你对 Cilium 还不太了解，可以参考我之前的两篇文章：
最近 Cilium v1.11.0 正式发布了，增加 Open Telemetry 的支持以及其他一些增强特性。同时，也宣布了 Cilium Service Mesh 的计划。当前 Cilium Service Mesh 正处于测试阶段，预期在 2022 年会合并到 Cilium v1.12 版本中。
Cilium Service Mesh 也带来了一个全新的模式。
Cilium 直接通过 eBPF 技术实现的 Service Mesh 相比我们常规的 Istio/Linkerd 等方案，最显著的特点就是将 Sidecar proxy 模型替换成了 Kernel 模型， 如下图：
不再需要每个应用程序旁边都放置一个 Sidecar 了，直接在每台 Node 上提供支持。
我在几个月前就已经知道了这个消息并且进行了一些讨论，最近随着 isovalent 的一篇文章 How eBPF will solve Service Mesh - Goodbye Sidecars ，Cilium Service Mesh 也成为了大家关注的焦点。
本篇我带你实际体验下 Cilium Service Mesh。
安装部署
这里我使用 KIND 作为测试环境，我的内核版本是 5.15.8 。
准备 KIND 集群
关于 KIND 命令行工具的安装这里就不再赘述了，感兴趣的小伙伴可以参考我之前的文章 《使用KIND搭建自己的本地 Kubernetes 测试环境》。
以下是我创建集群使用的配置文件：
apiVersion: kind.x-k8s.io/v1alpha4
kind: Cluster
nodes:
- role: control-plane
- role: worker
- role: worker
- role: worker
networking:
disableDefaultCNI: true
创建集群：
➜ cilium-mesh kind create cluster --config kind-config.yaml
Creating cluster "kind" ...
✓ Ensuring node image (kindest/node:v1.22.4) 🖼
✓ Preparing nodes 📦 📦 📦 📦
✓ Writing configuration 📜
✓ Starting control-plane 🕹️
✓ Installing StorageClass 💾
✓ Joining worker nodes 🚜
Set kubectl context to "kind-kind"
You can now use your cluster with:
kubectl cluster-info --context kind-kind
Not sure what to do next? 😅 Check out https://kind.sigs.k8s.io/docs/user/quick-start/
安装 Cilium CLI
这里我们使用 Cilium CLI 工具进行 Cilium 的部署。
➜ cilium-mesh curl -L --remote-name-all https://github.com/cilium/cilium-cli/releases/latest/download/cilium-linux-amd64.tar.gz\{,.sha256sum\}
[1/2]: https://github.com/cilium/cilium-cli/releases/latest/download/cilium-linux-amd64.tar.gz --> cilium-linux-amd64.tar.gz
--_curl_--https://github.com/cilium/cilium-cli/releases/latest/download/cilium-linux-amd64.tar.gz
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 154 100 154 0 0 243 0 --:--:-- --:--:-- --:--:-- 242
100 664 100 664 0 0 579 0 0:00:01 0:00:01 --:--:-- 579
100 14.6M 100 14.6M 0 0 2928k 0 0:00:05 0:00:05 --:--:-- 3910k
[2/2]: https://github.com/cilium/cilium-cli/releases/latest/download/cilium-linux-amd64.tar.gz.sha256sum --> cilium-linux-amd64.tar.gz.sha256sum
--_curl_--https://github.com/cilium/cilium-cli/releases/latest/download/cilium-linux-amd64.tar.gz.sha256sum
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 164 100 164 0 0 419 0 --:--:-- --:--:-- --:--:-- 418
100 674 100 674 0 0 861 0 --:--:-- --:--:-- --:--:-- 861
100 92 100 92 0 0 67 0 0:00:01 0:00:01 --:--:-- 0
➜ cilium-mesh ls
cilium-linux-amd64.tar.gz cilium-linux-amd64.tar.gz.sha256sum kind-config.yaml
➜ cilium-mesh tar -zxvf cilium-linux-amd64.tar.gz
cilium
加载镜像
在部署 Cilium 的过程中需要一些镜像，我们可以提前下载后加载到 KIND 的 Node 节点中。如果你的网络比较顺畅， 那这一步可以跳过。
➜ cilium-mesh ciliumMeshImage=("quay.io/cilium/cilium-service-mesh:v1.11.0-beta.1" "quay.io/cilium/operator-generic-service-mesh:v1.11.0-beta.1" "quay.io/cilium/hubble-relay-service-mesh:v1.11.0-beta.1")
➜ cilium-mesh for i in ${ciliumMeshImage[@]}
do
docker pull $i
kind load docker-image $i
done
部署 cilium
接下来我们直接使用 Cilium CLI 完成部署。注意这里的参数。
➜ cilium-mesh cilium install --version -service-mesh:v1.11.0-beta.1 --config enable-envoy-config=true --kube-proxy-replacement=probe --agent-image='quay.io/cilium/cilium-service-mesh:v1.11.0-beta.1' --operator-image='quay.io/cilium/operator-generic-service-mesh:v1.11.0-beta.1' --datapath-mode=vxlan
🔮 Auto-detected Kubernetes kind: kind
✨ Running "kind" validation checks
✅ Detected kind version "0.12.0"
ℹ️ using Cilium version "-service-mesh:v1.11.0-beta.1"
🔮 Auto-detected cluster name: kind-kind
🔮 Auto-detected IPAM mode: kubernetes
🔮 Custom datapath mode: vxlan
🔑 Found CA in secret cilium-ca
🔑 Generating certificates for Hubble...
🚀 Creating Service accounts...
🚀 Creating Cluster roles...
🚀 Creating ConfigMap for Cilium version 1.11.0...
ℹ️ Manual overwrite in ConfigMap: enable-envoy-config=true
🚀 Creating Agent DaemonSet...
🚀 Creating Operator Deployment...
⌛ Waiting for Cilium to be installed and ready...
✅ Cilium was successfully installed! Run 'cilium status' to view installation health
查看状态
在安装成功后， 可以通过 cilium status命令来查看当前 Cilium 的部署情况。
➜ cilium-mesh cilium status
/¯¯\
/¯¯\__/¯¯\ Cilium: OK
\__/¯¯\__/ Operator: OK
/¯¯\__/¯¯\ Hubble: disabled
\__/¯¯\__/ ClusterMesh: disabled
\__/
Deployment cilium-operator Desired: 1, Ready: 1/1, Available: 1/1
DaemonSet cilium Desired: 4, Ready: 4/4, Available: 4/4
Containers: cilium Running: 4
cilium-operator Running: 1
Cluster Pods: 3/3 managed by Cilium
Image versions cilium quay.io/cilium/cilium-service-mesh:v1.11.0-beta.1: 4
cilium-operator quay.io/cilium/operator-generic-service-mesh:v1.11.0-beta.1: 1
启用 Hubble
Hubble 主要是用来提供可观测能力的。在启用它之前，需要先加载一个镜像，如果网络畅通可以跳过。
docker.io/envoyproxy/envoy:v1.18.2@sha256:e8b37c1d75787dd1e712ff389b0d37337dc8a174a63bed9c34ba73359dc67da7
然后使用 Cilium CLI 开启 Hubble ：
➜ cilium-mesh cilium hubble enable --relay-image='quay.io/cilium/hubble-relay-service-mesh:v1.11.0-beta.1' --ui
🔑 Found CA in secret cilium-ca
✨ Patching ConfigMap cilium-config to enable Hubble...
♻️ Restarted Cilium pods
⌛ Waiting for Cilium to become ready before deploying other Hubble component(s)...
🔑 Generating certificates for Relay...
✨ Deploying Relay from quay.io/cilium/hubble-relay-service-mesh:v1.11.0-beta.1...
✨ Deploying Hubble UI from quay.io/cilium/hubble-ui:v0.8.3 and Hubble UI Backend from quay.io/cilium/hubble-ui-backend:v0.8.3...
⌛ Waiting for Hubble to be installed...
/¯¯\
/¯¯\__/¯¯\ Cilium: OK
\__/¯¯\__/ Operator: OK
/¯¯\__/¯¯\ Hubble: OK
\__/¯¯\__/ ClusterMesh: disabled
\__/
DaemonSet cilium Desired: 4, Ready: 4/4, Available: 4/4
Deployment cilium-operator Desired: 1, Ready: 1/1, Available: 1/1
Deployment hubble-relay Desired: 1, Ready: 1/1, Available: 1/1
Deployment hubble-ui Desired: 1, Unavailable: 1/1
Containers: cilium Running: 4
cilium-operator Running: 1
hubble-relay Running: 1
hubble-ui Running: 1
Cluster Pods: 5/5 managed by Cilium
Image versions cilium quay.io/cilium/cilium-service-mesh:v1.11.0-beta.1: 4
cilium-operator quay.io/cilium/operator-generic-service-mesh:v1.11.0-beta.1: 1
hubble-relay quay.io/cilium/hubble-relay-service-mesh:v1.11.0-beta.1: 1
hubble-ui quay.io/cilium/hubble-ui:v0.8.3: 1
hubble-ui quay.io/cilium/hubble-ui-backend:v0.8.3: 1
hubble-ui docker.io/envoyproxy/envoy:v1.18.2@sha256:e8b37c1d75787dd1e712ff389b0d37337dc8a174a63bed9c34ba73359dc67da7: 1
测试 7 层 Ingress 流量管理
安装LB
这里我们可以给 KIND 集群中安装 MetaLB ，以便于我们可以使用 LoadBalancer 类型的 svc 资源（Cilium 会默认创建一个 LoadBalancer 类型的 svc）。如果不安装 MetaLB ，那也可以使用 NodePort 的方式来进行替代。
具体过程就不一一介绍了，直接按下述操作步骤执行即可。
➜ cilium-mesh kubectl apply -f https://raw.githubusercontent.com/metallb/metallb/master/manifests/namespace.yaml
namespace/metallb-system created
➜ cilium-mesh kubectl create secret generic -n metallb-system memberlist --from-literal=secretkey="$(openssl rand -base64 128)"
secret/memberlist created
➜ cilium-mesh kubectl apply -f https://raw.githubusercontent.com/metallb/metallb/master/manifests/metallb.yaml
Warning: policy/v1beta1 PodSecurityPolicy is deprecated in v1.21+, unavailable in v1.25+
podsecuritypolicy.policy/controller created
podsecuritypolicy.policy/speaker created
serviceaccount/controller created
serviceaccount/speaker created
clusterrole.rbac.authorization.k8s.io/metallb-system:controller created
clusterrole.rbac.authorization.k8s.io/metallb-system:speaker created
role.rbac.authorization.k8s.io/config-watcher created
role.rbac.authorization.k8s.io/pod-lister created
role.rbac.authorization.k8s.io/controller created
clusterrolebinding.rbac.authorization.k8s.io/metallb-system:controller created
clusterrolebinding.rbac.authorization.k8s.io/metallb-system:speaker created
rolebinding.rbac.authorization.k8s.io/config-watcher created
rolebinding.rbac.authorization.k8s.io/pod-lister created
rolebinding.rbac.authorization.k8s.io/controller created
daemonset.apps/speaker created
deployment.apps/controller created
➜ cilium-mesh docker network inspect -f '{{.IPAM.Config}}' kind
[{172.18.0.0/16 172.18.0.1 map[]} {fc00:f853:ccd:e793::/64 fc00:f853:ccd:e793::1 map[]}]
➜ cilium-mesh vim kind-lb-cm.yaml
➜ cilium-mesh cat kind-lb-cm.yaml
apiVersion: v1
kind: ConfigMap
metadata:
namespace: metallb-system
name: config
data:
config: |
address-pools:
- name: default
protocol: layer2
addresses:
- 172.18.255.200-172.18.255.250
➜ cilium-mesh kubectl apply -f kind-lb-cm.yaml
configmap/config created
加载镜像
这里我们使用 hashicorp/http-echo:0.2.3作为示例程序，它们可以按照启动参数的不同响应不同的内容。
➜ cilium-mesh docker pull hashicorp/http-echo:0.2.3
0.2.3: Pulling from hashicorp/http-echo
86399148984b: Pull complete
Digest: sha256:ba27d460cd1f22a1a4331bdf74f4fccbc025552357e8a3249c40ae216275de96
Status: Downloaded newer image for hashicorp/http-echo:0.2.3
docker.io/hashicorp/http-echo:0.2.3
➜ cilium-mesh kind load docker-image hashicorp/http-echo:0.2.3
Image: "hashicorp/http-echo:0.2.3" with ID "sha256:a6838e9a6ff6ab3624720a7bd36152dda540ce3987714398003e14780e61478a" not yet present on node "kind-worker", loading...
Image: "hashicorp/http-echo:0.2.3" with ID "sha256:a6838e9a6ff6ab3624720a7bd36152dda540ce3987714398003e14780e61478a" not yet present on node "kind-worker2", loading...
Image: "hashicorp/http-echo:0.2.3" with ID "sha256:a6838e9a6ff6ab3624720a7bd36152dda540ce3987714398003e14780e61478a" not yet present on node "kind-control-plane", loading...
Image: "hashicorp/http-echo:0.2.3" with ID "sha256:a6838e9a6ff6ab3624720a7bd36152dda540ce3987714398003e14780e61478a" not yet present on node "kind-worker3", loading...
部署测试服务
本文中的所有配置文件均可在 https://github.com/tao12345666333/practical-kubernetes/tree/main/cilium-mesh 代码仓库中获取。
我们使用如下配置进行测试服务的部署：
apiVersion: v1
kind: Pod
metadata:
labels:
run: foo-app
name: foo-app
spec:
containers:
- image: hashicorp/http-echo:0.2.3
args:
- "-text=foo"
name: foo-app
ports:
- containerPort: 5678
resources: {}
dnsPolicy: ClusterFirst
restartPolicy: Always
status: {}
---
apiVersion: v1
kind: Service
metadata:
labels:
run: foo-app
name: foo-app
spec:
ports:
- port: 5678
protocol: TCP
targetPort: 5678
selector:
run: foo-app
---
apiVersion: v1
kind: Pod
metadata:
labels:
run: bar-app
name: bar-app
spec:
containers:
- image: hashicorp/http-echo:0.2.3
args:
- "-text=bar"
name: bar-app
ports:
- containerPort: 5678
resources: {}
dnsPolicy: ClusterFirst
restartPolicy: Always
---
apiVersion: v1
kind: Service
metadata:
labels:
run: bar-app
name: bar-app
spec:
ports:
- port: 5678
protocol: TCP
targetPort: 5678
selector:
run: bar-app
新建如下的 Ingress 资源文件：
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
name: cilium-ingress
namespace: default
spec:
ingressClassName: cilium
rules:
- http:
paths:
- backend:
service:
name: foo-app
port:
number: 5678
path: /foo
pathType: Prefix
- backend:
service:
name: bar-app
port:
number: 5678
path: /bar
pathType: Prefix
创建 Ingress 资源，然后可以看到产生了一个新的 LoadBalancer 类型的 svc 。
➜ cilium-mesh kubectl apply -f cilium-ingress.yaml
ingress.networking.k8s.io/cilium-ingress created
➜ cilium-mesh kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
bar-app ClusterIP 10.96.229.141 <none> 5678/TCP 106s
cilium-ingress-cilium-ingress LoadBalancer 10.96.161.128 172.18.255.200 80:31643/TCP 4s
foo-app ClusterIP 10.96.166.212 <none> 5678/TCP 106s
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 81m
➜ cilium-mesh kubectl get ing
NAME CLASS HOSTS ADDRESS PORTS AGE
cilium-ingress cilium * 172.18.255.200 80 1m
测试
使用 curl 命令进行测试访问，发现可以按照 Ingress 资源中的配置得到正确的响应。查看响应头，我们会发现这里的代理实际上还是使用的 Envoy 来完成的。
➜ cilium-mesh curl 172.18.255.200
➜ cilium-mesh curl 172.18.255.200/foo
foo
➜ cilium-mesh curl 172.18.255.200/bar
bar
➜ cilium-mesh curl -I 172.18.255.200/bar
HTTP/1.1 200 OK
Content-Length: 4
Connection: keep-alive
Content-Type: text/plain; charset=utf-8
Date: Sat, 18 Dec 2021 06:02:56 GMT
Keep-Alive: timeout=4
Proxy-Connection: keep-alive
Server: envoy
X-App-Name: http-echo
X-App-Version: 0.2.3
X-Envoy-Upstream-Service-Time: 0
➜ cilium-mesh curl -I 172.18.255.200/foo
HTTP/1.1 200 OK
Content-Length: 4
Connection: keep-alive
Content-Type: text/plain; charset=utf-8
Date: Sat, 18 Dec 2021 06:03:01 GMT
Keep-Alive: timeout=4
Proxy-Connection: keep-alive
Server: envoy
X-App-Name: http-echo
X-App-Version: 0.2.3
X-Envoy-Upstream-Service-Time: 0
测试 CiliumEnvoyConfig
在使用上述方式部署 CIlium 后， 它其实还安装了一些 CRD 资源。其中有一个是 CiliumEnvoyConfig用于配置服务之间代理的。
➜ cilium-mesh kubectl api-resources |grep cilium.io
ciliumclusterwidenetworkpolicies ccnp cilium.io/v2 false CiliumClusterwideNetworkPolicy
ciliumendpoints cep,ciliumep cilium.io/v2 true CiliumEndpoint
ciliumenvoyconfigs cec cilium.io/v2alpha1 false CiliumEnvoyConfig
ciliumexternalworkloads cew cilium.io/v2 false CiliumExternalWorkload
ciliumidentities ciliumid cilium.io/v2 false CiliumIdentity
ciliumnetworkpolicies cnp,ciliumnp cilium.io/v2 true CiliumNetworkPolicy
ciliumnodes cn,ciliumn cilium.io/v2 false CiliumNode
部署测试服务
可以先进行 Hubble 的 port-forward
➜ cilium-mesh cilium hubble port-forward
默认会监听到 4245 端口上，如果不提前执行此操作就会出现下述内容
🔭 Enabling Hubble telescope...
⚠️ Unable to contact Hubble Relay, disabling Hubble telescope and flow validation: rpc error: code = Unavailable desc = connection error: desc = "transport: Error while dialing dial tcp [::1]:4245: connect: connection refused"
如果已经开启 Hubble 的 port-forward ，正常情况下会得到如下输出：
➜ cilium-mesh cilium connectivity test --test egress-l7
ℹ️ Monitor aggregation detected, will skip some flow validation steps
⌛ [kind-kind] Waiting for deployments [client client2 echo-same-node] to become ready...
⌛ [kind-kind] Waiting for deployments [echo-other-node] to become ready...
⌛ [kind-kind] Waiting for CiliumEndpoint for pod cilium-test/client-6488dcf5d4-pk6w9 to appear...
⌛ [kind-kind] Waiting for CiliumEndpoint for pod cilium-test/client2-5998d566b4-hrhrb to appear...
⌛ [kind-kind] Waiting for CiliumEndpoint for pod cilium-test/echo-other-node-f4d46f75b-bqpcb to appear...
⌛ [kind-kind] Waiting for CiliumEndpoint for pod cilium-test/echo-same-node-745bd5c77-zpzdn to appear...
⌛ [kind-kind] Waiting for Service cilium-test/echo-other-node to become ready...
⌛ [kind-kind] Waiting for Service cilium-test/echo-same-node to become ready...
⌛ [kind-kind] Waiting for NodePort 172.18.0.5:32751 (cilium-test/echo-other-node) to become ready...
⌛ [kind-kind] Waiting for NodePort 172.18.0.5:32133 (cilium-test/echo-same-node) to become ready...
⌛ [kind-kind] Waiting for NodePort 172.18.0.3:32133 (cilium-test/echo-same-node) to become ready...
⌛ [kind-kind] Waiting for NodePort 172.18.0.3:32751 (cilium-test/echo-other-node) to become ready...
⌛ [kind-kind] Waiting for NodePort 172.18.0.2:32751 (cilium-test/echo-other-node) to become ready...
⌛ [kind-kind] Waiting for NodePort 172.18.0.2:32133 (cilium-test/echo-same-node) to become ready...
⌛ [kind-kind] Waiting for NodePort 172.18.0.4:32751 (cilium-test/echo-other-node) to become ready...
⌛ [kind-kind] Waiting for NodePort 172.18.0.4:32133 (cilium-test/echo-same-node) to become ready...
ℹ️ Skipping IPCache check
⌛ [kind-kind] Waiting for pod cilium-test/client-6488dcf5d4-pk6w9 to reach default/kubernetes service...
⌛ [kind-kind] Waiting for pod cilium-test/client2-5998d566b4-hrhrb to reach default/kubernetes service...
🔭 Enabling Hubble telescope...
ℹ️ Hubble is OK, flows: 16380/16380
🏃 Running tests...
[=] Skipping Test [no-policies]
[=] Skipping Test [allow-all]
[=] Skipping Test [client-ingress]
[=] Skipping Test [echo-ingress]
[=] Skipping Test [client-egress]
[=] Skipping Test [to-entities-world]
[=] Skipping Test [to-cidr-1111]
[=] Skipping Test [echo-ingress-l7]
[=] Test [client-egress-l7]
..........
[=] Skipping Test [dns-only]
[=] Skipping Test [to-fqdns]
✅ All 1 tests (10 actions) successful, 10 tests skipped, 0 scenarios skipped.
我们也可以同时打开UI看看：
➜ cilium-mesh cilium hubble ui
ℹ️ Opening "http://localhost:12000" in your browser...
效果图如下：
这个操作实际上会进行如下部署：
➜ cilium-mesh kubectl -n cilium-test get all
NAME READY STATUS RESTARTS AGE
pod/client-6488dcf5d4-pk6w9 1/1 Running 0 66m
pod/client2-5998d566b4-hrhrb 1/1 Running 0 66m
pod/echo-other-node-f4d46f75b-bqpcb 1/1 Running 0 66m
pod/echo-same-node-745bd5c77-zpzdn 1/1 Running 0 66m
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
service/echo-other-node NodePort 10.96.124.211 <none> 8080:32751/TCP 66m
service/echo-same-node NodePort 10.96.136.252 <none> 8080:32133/TCP 66m
NAME READY UP-TO-DATE AVAILABLE AGE
deployment.apps/client 1/1 1 1 66m
deployment.apps/client2 1/1 1 1 66m
deployment.apps/echo-other-node 1/1 1 1 66m
deployment.apps/echo-same-node 1/1 1 1 66m
NAME DESIRED CURRENT READY AGE
replicaset.apps/client-6488dcf5d4 1 1 1 66m
replicaset.apps/client2-5998d566b4 1 1 1 66m
replicaset.apps/echo-other-node-f4d46f75b 1 1 1 66m
replicaset.apps/echo-same-node-745bd5c77 1 1 1 66m
我们也可以看看它的 label：
➜ cilium-mesh kubectl get pods -n cilium-test --show-labels -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES LABELS
client-6488dcf5d4-pk6w9 1/1 Running 0 67m 10.244.3.7 kind-worker3 <none> <none> kind=client,name=client,pod-template-hash=6488dcf5d4
client2-5998d566b4-hrhrb 1/1 Running 0 67m 10.244.3.18 kind-worker3 <none> <none> kind=client,name=client2,other=client,pod-template-hash=5998d566b4
echo-other-node-f4d46f75b-bqpcb 1/1 Running 0 67m 10.244.1.146 kind-worker2 <none> <none> kind=echo,name=echo-other-node,pod-template-hash=f4d46f75b
echo-same-node-745bd5c77-zpzdn 1/1 Running 0 67m 10.244.3.164 kind-worker3 <none> <none> kind=echo,name=echo-same-node,other=echo,pod-template-hash=745bd5c77
测试
这里我们在主机上进行操作下， 先拿到 client2 的 Pod 名称，然后通过 Hubble 命令观察所有访问此 Pod 的流量。
➜ cilium-mesh export CLIENT2=client2-5998d566b4-hrhrb
➜ cilium-mesh hubble observe --from-pod cilium-test/$CLIENT2 -f
Dec 18 14:07:37.200: cilium-test/client2-5998d566b4-hrhrb:44805 <> kube-system/coredns-78fcd69978-7lbwh:53 to-overlay FORWARDED (UDP)
Dec 18 14:07:37.200: cilium-test/client2-5998d566b4-hrhrb:44805 -> kube-system/coredns-78fcd69978-7lbwh:53 to-endpoint FORWARDED (UDP)
Dec 18 14:07:37.200: cilium-test/client2-5998d566b4-hrhrb:44805 <> kube-system/coredns-78fcd69978-7lbwh:53 to-overlay FORWARDED (UDP)
Dec 18 14:07:37.200: cilium-test/client2-5998d566b4-hrhrb:44805 -> kube-system/coredns-78fcd69978-7lbwh:53 to-endpoint FORWARDED (UDP)
Dec 18 14:07:37.200: cilium-test/client2-5998d566b4-hrhrb:42260 -> cilium-test/echo-same-node-745bd5c77-zpzdn:8080 to-endpoint FORWARDED (TCP Flags: SYN)
Dec 18 14:07:37.201: cilium-test/client2-5998d566b4-hrhrb:42260 -> cilium-test/echo-same-node-745bd5c77-zpzdn:8080 to-endpoint FORWARDED (TCP Flags: ACK)
Dec 18 14:07:37.201: cilium-test/client2-5998d566b4-hrhrb:42260 -> cilium-test/echo-same-node-745bd5c77-zpzdn:8080 to-endpoint FORWARDED (TCP Flags: ACK, PSH)
Dec 18 14:07:37.202: cilium-test/client2-5998d566b4-hrhrb:42260 -> cilium-test/echo-same-node-745bd5c77-zpzdn:8080 to-endpoint FORWARDED (TCP Flags: ACK, FIN)
Dec 18 14:07:37.203: cilium-test/client2-5998d566b4-hrhrb:42260 -> cilium-test/echo-same-node-745bd5c77-zpzdn:8080 to-endpoint FORWARDED (TCP Flags: ACK)
Dec 18 14:07:50.769: cilium-test/client2-5998d566b4-hrhrb:36768 <> kube-system/coredns-78fcd69978-7lbwh:53 to-overlay FORWARDED (UDP)
Dec 18 14:07:50.769: cilium-test/client2-5998d566b4-hrhrb:36768 <> kube-system/coredns-78fcd69978-7lbwh:53 to-overlay FORWARDED (UDP)
Dec 18 14:07:50.769: cilium-test/client2-5998d566b4-hrhrb:36768 -> kube-system/coredns-78fcd69978-7lbwh:53 to-endpoint FORWARDED (UDP)
Dec 18 14:07:50.769: cilium-test/client2-5998d566b4-hrhrb:36768 -> kube-system/coredns-78fcd69978-7lbwh:53 to-endpoint FORWARDED (UDP)
Dec 18 14:07:50.770: cilium-test/client2-5998d566b4-hrhrb:42068 <> cilium-test/echo-other-node-f4d46f75b-bqpcb:8080 to-overlay FORWARDED (TCP Flags: SYN)
Dec 18 14:07:50.770: cilium-test/client2-5998d566b4-hrhrb:42068 -> cilium-test/echo-other-node-f4d46f75b-bqpcb:8080 to-endpoint FORWARDED (TCP Flags: SYN)
Dec 18 14:07:50.770: cilium-test/client2-5998d566b4-hrhrb:42068 <> cilium-test/echo-other-node-f4d46f75b-bqpcb:8080 to-overlay FORWARDED (TCP Flags: ACK)
Dec 18 14:07:50.770: cilium-test/client2-5998d566b4-hrhrb:42068 -> cilium-test/echo-other-node-f4d46f75b-bqpcb:8080 to-endpoint FORWARDED (TCP Flags: ACK)
Dec 18 14:07:50.770: cilium-test/client2-5998d566b4-hrhrb:42068 <> cilium-test/echo-other-node-f4d46f75b-bqpcb:8080 to-overlay FORWARDED (TCP Flags: ACK, PSH)
Dec 18 14:07:50.770: cilium-test/client2-5998d566b4-hrhrb:42068 -> cilium-test/echo-other-node-f4d46f75b-bqpcb:8080 to-endpoint FORWARDED (TCP Flags: ACK, PSH)
Dec 18 14:07:50.771: cilium-test/client2-5998d566b4-hrhrb:42068 <> cilium-test/echo-other-node-f4d46f75b-bqpcb:8080 to-overlay FORWARDED (TCP Flags: ACK, FIN)
Dec 18 14:07:50.771: cilium-test/client2-5998d566b4-hrhrb:42068 -> cilium-test/echo-other-node-f4d46f75b-bqpcb:8080 to-endpoint FORWARDED (TCP Flags: ACK, FIN)
Dec 18 14:07:50.772: cilium-test/client2-5998d566b4-hrhrb:42068 <> cilium-test/echo-other-node-f4d46f75b-bqpcb:8080 to-overlay FORWARDED (TCP Flags: ACK)
Dec 18 14:07:50.772: cilium-test/client2-5998d566b4-hrhrb:42068 -> cilium-test/echo-other-node-f4d46f75b-bqpcb:8080 to-endpoint FORWARDED (TCP Flags: ACK)
以上输出是由于我们执行了下面的操作：
kubectl exec -it -n cilium-test $CLIENT2 -- curl -v echo-same-node:8080/
kubectl exec -it -n cilium-test $CLIENT2 -- curl -v echo-other-node:8080/
日志中基本上都是 to-endpoint 或者 to-overlay的。
测试使用 proxy
需要先安装 networkpolicy ， 我们可以直接从 Cilium CLI 的仓库中拿到。
kubectl apply -f https://raw.githubusercontent.com/cilium/cilium-cli/master/connectivity/manifests/client-egress-l7-http.yaml
kubectl apply -f https://raw.githubusercontent.com/cilium/cilium-cli/master/connectivity/manifests/client-egress-only-dns.yaml
然后重复上面的请求：
Dec 18 14:33:40.570: cilium-test/client2-5998d566b4-hrhrb:44344 -> kube-system/coredns-78fcd69978-2ww28:53 L3-L4 REDIRECTED (UDP)
Dec 18 14:33:40.570: cilium-test/client2-5998d566b4-hrhrb:44344 -> kube-system/coredns-78fcd69978-2ww28:53 to-proxy FORWARDED (UDP)
Dec 18 14:33:40.570: cilium-test/client2-5998d566b4-hrhrb:44344 -> kube-system/coredns-78fcd69978-2ww28:53 to-proxy FORWARDED (UDP)
Dec 18 14:33:40.570: cilium-test/client2-5998d566b4-hrhrb:44344 -> kube-system/coredns-78fcd69978-2ww28:53 dns-request FORWARDED (DNS Query echo-other-node.cilium-test.svc.cluster.local. A)
Dec 18 14:33:40.570: cilium-test/client2-5998d566b4-hrhrb:44344 -> kube-system/coredns-78fcd69978-2ww28:53 dns-request FORWARDED (DNS Query echo-other-node.cilium-test.svc.cluster.local. AAAA)
Dec 18 14:33:40.571: cilium-test/client2-5998d566b4-hrhrb:42074 -> cilium-test/echo-other-node-f4d46f75b-bqpcb:8080 L3-L4 REDIRECTED (TCP Flags: SYN)
Dec 18 14:33:40.571: cilium-test/client2-5998d566b4-hrhrb:42074 -> cilium-test/echo-other-node-f4d46f75b-bqpcb:8080 to-proxy FORWARDED (TCP Flags: SYN)
Dec 18 14:33:40.571: cilium-test/client2-5998d566b4-hrhrb:42074 -> cilium-test/echo-other-node-f4d46f75b-bqpcb:8080 to-proxy FORWARDED (TCP Flags: ACK)
Dec 18 14:33:40.571: cilium-test/client2-5998d566b4-hrhrb:42074 -> cilium-test/echo-other-node-f4d46f75b-bqpcb:8080 to-proxy FORWARDED (TCP Flags: ACK, PSH)
Dec 18 14:33:40.572: cilium-test/client2-5998d566b4-hrhrb:42074 -> cilium-test/echo-other-node-f4d46f75b-bqpcb:8080 http-request FORWARDED (HTTP/1.1 GET http://echo-other-node:8080/)
Dec 18 14:33:40.573: cilium-test/client2-5998d566b4-hrhrb:42074 -> cilium-test/echo-other-node-f4d46f75b-bqpcb:8080 to-proxy FORWARDED (TCP Flags: ACK, FIN)
Dec 18 14:33:40.573: cilium-test/client2-5998d566b4-hrhrb:42074 -> cilium-test/echo-other-node-f4d46f75b-bqpcb:8080 to-proxy FORWARDED (TCP Flags: ACK)
执行另一个请求：
➜ cilium-mesh kubectl exec -it -n cilium-test $CLIENT2 -- curl -v echo-same-node:8080/
也可以看到如下输出，其中有 to-proxy的字样。
Dec 18 14:45:18.857: cilium-test/client2-5998d566b4-hrhrb:58895 -> kube-system/coredns-78fcd69978-2ww28:53 L3-L4 REDIRECTED (UDP)
Dec 18 14:45:18.857: cilium-test/client2-5998d566b4-hrhrb:58895 -> kube-system/coredns-78fcd69978-2ww28:53 to-proxy FORWARDED (UDP)
Dec 18 14:45:18.857: cilium-test/client2-5998d566b4-hrhrb:58895 -> kube-system/coredns-78fcd69978-2ww28:53 to-proxy FORWARDED (UDP)
Dec 18 14:45:18.857: cilium-test/client2-5998d566b4-hrhrb:58895 -> kube-system/coredns-78fcd69978-2ww28:53 dns-request FORWARDED (DNS Query echo-same-node.cilium-test.svc.cluster.local. AAAA)
Dec 18 14:45:18.857: cilium-test/client2-5998d566b4-hrhrb:58895 -> kube-system/coredns-78fcd69978-2ww28:53 dns-request FORWARDED (DNS Query echo-same-node.cilium-test.svc.cluster.local. A)
Dec 18 14:45:18.858: cilium-test/client2-5998d566b4-hrhrb:42266 -> cilium-test/echo-same-node-745bd5c77-zpzdn:8080 L3-L4 REDIRECTED (TCP Flags: SYN)
Dec 18 14:45:18.858: cilium-test/client2-5998d566b4-hrhrb:42266 -> cilium-test/echo-same-node-745bd5c77-zpzdn:8080 to-proxy FORWARDED (TCP Flags: SYN)
Dec 18 14:45:18.858: cilium-test/client2-5998d566b4-hrhrb:42266 -> cilium-test/echo-same-node-745bd5c77-zpzdn:8080 to-proxy FORWARDED (TCP Flags: ACK)
Dec 18 14:45:18.858: cilium-test/client2-5998d566b4-hrhrb:42266 -> cilium-test/echo-same-node-745bd5c77-zpzdn:8080 to-proxy FORWARDED (TCP Flags: ACK, PSH)
Dec 18 14:45:18.858: cilium-test/client2-5998d566b4-hrhrb:42266 -> cilium-test/echo-same-node-745bd5c77-zpzdn:8080 http-request FORWARDED (HTTP/1.1 GET http://echo-same-node:8080/)
Dec 18 14:45:18.859: cilium-test/client2-5998d566b4-hrhrb:42266 -> cilium-test/echo-same-node-745bd5c77-zpzdn:8080 to-proxy FORWARDED (TCP Flags: ACK, FIN)
Dec 18 14:45:18.859: cilium-test/client2-5998d566b4-hrhrb:42266 -> cilium-test/echo-same-node-745bd5c77-zpzdn:8080 to-proxy FORWARDED (TCP Flags: ACK)
其实看请求头更加方便：
➜ cilium-mesh kubectl exec -it -n cilium-test $CLIENT2 -- curl -I echo-same-node:8080/
HTTP/1.1 403 Forbidden
content-length: 15
content-type: text/plain
date: Sat, 18 Dec 2021 14:47:39 GMT
server: envoy
之前都是如下：
# 没有 proxy
➜ cilium-mesh kubectl exec -it -n cilium-test $CLIENT2 -- curl -v echo-same-node:8080/
* Trying 10.96.136.252:8080...
* Connected to echo-same-node (10.96.136.252) port 8080 (#0)
> GET / HTTP/1.1
> Host: echo-same-node:8080
> User-Agent: curl/7.78.0
> Accept: */*
>
* Mark bundle as not supporting multiuse
< HTTP/1.1 200 OK
< X-Powered-By: Express
< Vary: Origin, Accept-Encoding
< Access-Control-Allow-Credentials: true
< Accept-Ranges: bytes
< Cache-Control: public, max-age=0
< Last-Modified: Sat, 26 Oct 1985 08:15:00 GMT
< ETag: W/"809-7438674ba0"
< Content-Type: text/html; charset=UTF-8
< Content-Length: 2057
< Date: Sat, 18 Dec 2021 14:07:37 GMT
< Connection: keep-alive
< Keep-Alive: timeout=5
请求一个不存在的地址：
以前请求响应是 404 ，现在是 403 ,并得到如下内容
➜ cilium-mesh kubectl exec -it -n cilium-test $CLIENT2 -- curl -v echo-same-node:8080/foo
* Trying 10.96.136.252:8080...
* Connected to echo-same-node (10.96.136.252) port 8080 (#0)
> GET /foo HTTP/1.1
> Host: echo-same-node:8080
> User-Agent: curl/7.78.0
> Accept: */*
>
* Mark bundle as not supporting multiuse
< HTTP/1.1 403 Forbidden
< content-length: 15
< content-type: text/plain
< date: Sat, 18 Dec 2021 14:50:38 GMT
< server: envoy
<
Access denied
* Connection #0 to host echo-same-node left intact
日志中也都是 to-proxy的字样。
Dec 18 14:50:39.185: cilium-test/client2-5998d566b4-hrhrb:37683 -> kube-system/coredns-78fcd69978-7lbwh:53 L3-L4 REDIRECTED (UDP)
Dec 18 14:50:39.185: cilium-test/client2-5998d566b4-hrhrb:37683 -> kube-system/coredns-78fcd69978-7lbwh:53 to-proxy FORWARDED (UDP)
Dec 18 14:50:39.185: cilium-test/client2-5998d566b4-hrhrb:37683 -> kube-system/coredns-78fcd69978-7lbwh:53 to-proxy FORWARDED (UDP)
Dec 18 14:50:39.185: cilium-test/client2-5998d566b4-hrhrb:37683 -> kube-system/coredns-78fcd69978-7lbwh:53 dns-request FORWARDED (DNS Query echo-same-node.cilium-test.svc.cluster.local. AAAA)
Dec 18 14:50:39.185: cilium-test/client2-5998d566b4-hrhrb:37683 -> kube-system/coredns-78fcd69978-7lbwh:53 dns-request FORWARDED (DNS Query echo-same-node.cilium-test.svc.cluster.local. A)
Dec 18 14:50:39.186: cilium-test/client2-5998d566b4-hrhrb:42274 -> cilium-test/echo-same-node-745bd5c77-zpzdn:8080 L3-L4 REDIRECTED (TCP Flags: SYN)
Dec 18 14:50:39.186: cilium-test/client2-5998d566b4-hrhrb:42274 -> cilium-test/echo-same-node-745bd5c77-zpzdn:8080 to-proxy FORWARDED (TCP Flags: SYN)
Dec 18 14:50:39.186: cilium-test/client2-5998d566b4-hrhrb:42274 -> cilium-test/echo-same-node-745bd5c77-zpzdn:8080 to-proxy FORWARDED (TCP Flags: ACK)
Dec 18 14:50:39.186: cilium-test/client2-5998d566b4-hrhrb:42274 -> cilium-test/echo-same-node-745bd5c77-zpzdn:8080 to-proxy FORWARDED (TCP Flags: ACK, PSH)
Dec 18 14:50:39.186: cilium-test/client2-5998d566b4-hrhrb:42274 -> cilium-test/echo-same-node-745bd5c77-zpzdn:8080 http-request DROPPED (HTTP/1.1 GET http://echo-same-node:8080/foo)
Dec 18 14:50:39.186: cilium-test/client2-5998d566b4-hrhrb:42274 -> cilium-test/echo-same-node-745bd5c77-zpzdn:8080 to-proxy FORWARDED (TCP Flags: ACK, FIN)
Dec 18 14:50:39.187: cilium-test/client2-5998d566b4-hrhrb:42274 -> cilium-test/echo-same-node-745bd5c77-zpzdn:8080 to-proxy FORWARDED (TCP Flags: ACK)
我们使用如下内容作为 Envoy 的配置文件，其中包含 rewrite 策略。
apiVersion: cilium.io/v2alpha1
kind: CiliumEnvoyConfig
metadata:
name: envoy-lb-listener
spec:
services:
- name: echo-other-node
namespace: cilium-test
- name: echo-same-node
namespace: cilium-test
resources:
- "@type": type.googleapis.com/envoy.config.listener.v3.Listener
name: envoy-lb-listener
filter_chains:
- filters:
- name: envoy.filters.network.http_connection_manager
typed_config:
"@type": type.googleapis.com/envoy.extensions.filters.network.http_connection_manager.v3.HttpConnectionManager
stat_prefix: envoy-lb-listener
rds:
route_config_name: lb_route
http_filters:
- name: envoy.filters.http.router
- "@type": type.googleapis.com/envoy.config.route.v3.RouteConfiguration
name: lb_route
virtual_hosts:
- name: "lb_route"
domains: ["*"]
routes:
- match:
prefix: "/"
route:
weighted_clusters:
clusters:
- name: "cilium-test/echo-same-node"
weight: 50
- name: "cilium-test/echo-other-node"
weight: 50
retry_policy:
retry_on: 5xx
num_retries: 3
per_try_timeout: 1s
regex_rewrite:
pattern:
google_re2: {}
regex: "^/foo.*$"
substitution: "/"
- "@type": type.googleapis.com/envoy.config.cluster.v3.Cluster
name: "cilium-test/echo-same-node"
connect_timeout: 5s
lb_policy: ROUND_ROBIN
type: EDS
outlier_detection:
split_external_local_origin_errors: true
consecutive_local_origin_failure: 2
- "@type": type.googleapis.com/envoy.config.cluster.v3.Cluster
name: "cilium-test/echo-other-node"
connect_timeout: 3s
lb_policy: ROUND_ROBIN
type: EDS
outlier_detection:
split_external_local_origin_errors: true
consecutive_local_origin_failure: 2
测试请求时，发现可以正确的得到响应了。
➜ cilium-mesh kubectl exec -it -n cilium-test $CLIENT2 -- curl -X GET -I echo-same-node:8080/
HTTP/1.1 200 OK
x-powered-by: Express
vary: Origin, Accept-Encoding
access-control-allow-credentials: true
accept-ranges: bytes
cache-control: public, max-age=0
last-modified: Sat, 26 Oct 1985 08:15:00 GMT
etag: W/"809-7438674ba0"
content-type: text/html; charset=UTF-8
content-length: 2057
date: Sat, 18 Dec 2021 15:00:01 GMT
x-envoy-upstream-service-time: 1
server: envoy
并且请求 /foo地址时，也可以正确的得到响应了。
➜ cilium-mesh kubectl exec -it -n cilium-test $CLIENT2 -- curl -X GET -I echo-same-node:8080/foo
HTTP/1.1 200 OK
x-powered-by: Express
vary: Origin, Accept-Encoding
access-control-allow-credentials: true
accept-ranges: bytes
cache-control: public, max-age=0
last-modified: Sat, 26 Oct 1985 08:15:00 GMT
etag: W/"809-7438674ba0"
content-type: text/html; charset=UTF-8
content-length: 2057
date: Sat, 18 Dec 2021 15:01:40 GMT
x-envoy-upstream-service-time: 2
server: envoy
同时：请求 /foo 的时候，流量如下: 直接转换成功了对/的访问
Dec 18 15:02:22.541: cilium-test/client2-5998d566b4-hrhrb:38860 -> kube-system/coredns-78fcd69978-2ww28:53 L3-L4 REDIRECTED (UDP)
Dec 18 15:02:22.541: cilium-test/client2-5998d566b4-hrhrb:38860 -> kube-system/coredns-78fcd69978-2ww28:53 to-proxy FORWARDED (UDP)
Dec 18 15:02:22.541: cilium-test/client2-5998d566b4-hrhrb:38860 -> kube-system/coredns-78fcd69978-2ww28:53 to-proxy FORWARDED (UDP)
Dec 18 15:02:22.541: cilium-test/client2-5998d566b4-hrhrb:38860 -> kube-system/coredns-78fcd69978-2ww28:53 dns-request FORWARDED (DNS Query echo-same-node.cilium-test.svc.cluster.local. AAAA)
Dec 18 15:02:22.541: cilium-test/client2-5998d566b4-hrhrb:38860 -> kube-system/coredns-78fcd69978-2ww28:53 dns-request FORWARDED (DNS Query echo-same-node.cilium-test.svc.cluster.local. A)
Dec 18 15:02:22.542: cilium-test/client2-5998d566b4-hrhrb:53062 -> cilium-test/echo-same-node:8080 none REDIRECTED (TCP Flags: SYN)
Dec 18 15:02:22.542: cilium-test/client2-5998d566b4-hrhrb:53062 -> cilium-test/echo-same-node:8080 to-proxy FORWARDED (TCP Flags: SYN)
Dec 18 15:02:22.542: cilium-test/client2-5998d566b4-hrhrb:53062 -> cilium-test/echo-same-node:8080 to-proxy FORWARDED (TCP Flags: ACK)
Dec 18 15:02:22.542: cilium-test/client2-5998d566b4-hrhrb:53062 -> cilium-test/echo-same-node:8080 to-proxy FORWARDED (TCP Flags: ACK, PSH)
Dec 18 15:02:22.542: cilium-test/client2-5998d566b4-hrhrb:53048 -> cilium-test/echo-same-node-745bd5c77-zpzdn:8080 to-proxy FORWARDED (TCP Flags: ACK, PSH)
Dec 18 15:02:22.542: cilium-test/client2-5998d566b4-hrhrb:53048 -> cilium-test/echo-same-node-745bd5c77-zpzdn:8080 http-request FORWARDED (HTTP/1.1 GET http://echo-same-node:8080/)
Dec 18 15:02:22.543: cilium-test/client2-5998d566b4-hrhrb:53062 -> cilium-test/echo-same-node:8080 to-proxy FORWARDED (TCP Flags: ACK, FIN)
Dec 18 15:02:22.544: cilium-test/client2-5998d566b4-hrhrb:53062 -> cilium-test/echo-same-node:8080 to-proxy FORWARDED (TCP Flags: ACK)
多次请求看日志：
Dec 18 15:07:20.883: cilium-test/client2-5998d566b4-hrhrb:49656 -> kube-system/coredns-78fcd69978-2ww28:53 L3-L4 REDIRECTED (UDP)
Dec 18 15:07:20.883: cilium-test/client2-5998d566b4-hrhrb:49656 -> kube-system/coredns-78fcd69978-2ww28:53 to-proxy FORWARDED (UDP)
Dec 18 15:07:20.883: cilium-test/client2-5998d566b4-hrhrb:49656 -> kube-system/coredns-78fcd69978-2ww28:53 to-proxy FORWARDED (UDP)
Dec 18 15:07:20.883: cilium-test/client2-5998d566b4-hrhrb:49656 -> kube-system/coredns-78fcd69978-2ww28:53 dns-request FORWARDED (DNS Query echo-same-node.cilium-test.svc.cluster.local. A)
Dec 18 15:07:20.884: cilium-test/client2-5998d566b4-hrhrb:49656 -> kube-system/coredns-78fcd69978-2ww28:53 dns-request FORWARDED (DNS Query echo-same-node.cilium-test.svc.cluster.local. AAAA)
Dec 18 15:07:20.885: cilium-test/client2-5998d566b4-hrhrb:53070 -> cilium-test/echo-same-node:8080 none REDIRECTED (TCP Flags: SYN)
Dec 18 15:07:20.885: cilium-test/client2-5998d566b4-hrhrb:53070 -> cilium-test/echo-same-node:8080 to-proxy FORWARDED (TCP Flags: SYN)
Dec 18 15:07:20.885: cilium-test/client2-5998d566b4-hrhrb:53070 -> cilium-test/echo-same-node:8080 to-proxy FORWARDED (TCP Flags: ACK)
Dec 18 15:07:20.885: cilium-test/client2-5998d566b4-hrhrb:53070 -> cilium-test/echo-same-node:8080 to-proxy FORWARDED (TCP Flags: ACK, PSH)
Dec 18 15:07:20.885: cilium-test/client2-5998d566b4-hrhrb:53064 -> cilium-test/echo-same-node-745bd5c77-zpzdn:8080 to-proxy FORWARDED (TCP Flags: ACK, PSH)
Dec 18 15:07:20.885: cilium-test/client2-5998d566b4-hrhrb:53064 -> cilium-test/echo-same-node-745bd5c77-zpzdn:8080 http-request FORWARDED (HTTP/1.1 GET http://echo-same-node:8080/)
Dec 18 15:07:20.886: cilium-test/client2-5998d566b4-hrhrb:53070 -> cilium-test/echo-same-node:8080 to-proxy FORWARDED (TCP Flags: ACK, FIN)
Dec 18 15:07:20.886: cilium-test/client2-5998d566b4-hrhrb:53070 -> cilium-test/echo-same-node:8080 to-proxy FORWARDED (TCP Flags: ACK)
Dec 18 15:07:26.086: cilium-test/client2-5998d566b4-hrhrb:53048 -> cilium-test/echo-same-node-745bd5c77-zpzdn:8080 to-proxy FORWARDED (TCP Flags: ACK)
Dec 18 15:07:44.739: cilium-test/client2-5998d566b4-hrhrb:39057 -> kube-system/coredns-78fcd69978-7lbwh:53 L3-L4 REDIRECTED (UDP)
Dec 18 15:07:44.739: cilium-test/client2-5998d566b4-hrhrb:39057 -> kube-system/coredns-78fcd69978-7lbwh:53 to-proxy FORWARDED (UDP)
Dec 18 15:07:44.740: cilium-test/client2-5998d566b4-hrhrb:39057 -> kube-system/coredns-78fcd69978-7lbwh:53 to-proxy FORWARDED (UDP)
Dec 18 15:07:44.740: cilium-test/client2-5998d566b4-hrhrb:39057 -> kube-system/coredns-78fcd69978-7lbwh:53 dns-request FORWARDED (DNS Query echo-same-node.cilium-test.svc.cluster.local. AAAA)
Dec 18 15:07:44.740: cilium-test/client2-5998d566b4-hrhrb:39057 -> kube-system/coredns-78fcd69978-7lbwh:53 dns-request FORWARDED (DNS Query echo-same-node.cilium-test.svc.cluster.local. A)
Dec 18 15:07:44.741: cilium-test/client2-5998d566b4-hrhrb:53072 -> cilium-test/echo-same-node:8080 none REDIRECTED (TCP Flags: SYN)
Dec 18 15:07:44.741: cilium-test/client2-5998d566b4-hrhrb:53072 -> cilium-test/echo-same-node:8080 to-proxy FORWARDED (TCP Flags: SYN)
Dec 18 15:07:44.741: cilium-test/client2-5998d566b4-hrhrb:53072 -> cilium-test/echo-same-node:8080 to-proxy FORWARDED (TCP Flags: ACK)
Dec 18 15:07:44.741: cilium-test/client2-5998d566b4-hrhrb:53072 -> cilium-test/echo-same-node:8080 to-proxy FORWARDED (TCP Flags: ACK, PSH)
Dec 18 15:07:44.742: cilium-test/client2-5998d566b4-hrhrb:53068 -> cilium-test/echo-other-node-f4d46f75b-bqpcb:8080 to-proxy FORWARDED (TCP Flags: ACK, PSH)
Dec 18 15:07:44.742: cilium-test/client2-5998d566b4-hrhrb:53068 -> cilium-test/echo-other-node-f4d46f75b-bqpcb:8080 http-request FORWARDED (HTTP/1.1 GET http://echo-same-node:8080/)
Dec 18 15:07:44.744: cilium-test/client2-5998d566b4-hrhrb:53072 -> cilium-test/echo-same-node:8080 to-proxy FORWARDED (TCP Flags: ACK, FIN)
Dec 18 15:07:44.744: cilium-test/client2-5998d566b4-hrhrb:53072 -> cilium-test/echo-same-node:8080 to-proxy FORWARDED (TCP Flags: ACK)
可以看到它真的成功的进行了负载均衡。
总结
本文我带你部署了 Cilium Service Mesh，并通过两个示例，带你体验了 Cilium Service Mesh 的工作情况。
整体而言， 这种方式能带来一定的便利性，但它的服务间流量配置主要依靠于 CiliumEnvoyConfig ，不算太方便。
一起来期待它后续的演进！
PS: 本文中的所有配置文件均可在 https://github.com/tao12345666333/practical-kubernetes/tree/main/cilium-mesh 代码仓库中获取。
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