Contents

(Khi chuyển đổi từ calico , sau khi apply yaml cilium, cần khởi động lại worker node cho ăn hoàn toàn, nếu ko pod cilium mới sẽ bị trạng thái pending)

1.1 Cài đặt cilium từ helm

Dùng kubeadm reset, sau đó kubeadm init lại. Join lại. Apply cilim, sau đó xóa proxy, xóa cilium sau đó apply lại cilium.

https://docs.cilium.io/en/stable/installation/k8s-install-helm/#install-cilium

helm repo add cilium https://helm.cilium.io/

helm show values cilium/cilium > values.yaml

cat values.yaml | grep -A 5 'relay:'

helm pull cilium/cilium

tar -xvzf cilium-1.18.2.tgz

helm show chart cilium/cilium

# Cài đặt ( CHÚ Ý SỬA FILE VALUES với các option bên dưới)

helm install cilium cilium/cilium \

--namespace kube-system \

--version 1.18.2 \

--create-namespace --values values.yaml

# Cài đặt thư mục tải về

helm install cilium cilium/ --namespace kube-system --create-namespace --values values.yaml

Kiểm tra cilium agent , cilium-envoy, cilium-operator:

Những option nên bật trong Helm values.yaml

Chi tiết config	Giải thích chức năng
Chú ý cài cilium cli và hubble cli trước khi chạy
Khai báo cài đặt ban đầu, bắt buộc có	k8sServiceHost: "master01" #dòng 78 k8sServicePort: "6443" #dòng 81
Bật debug mode	# Dòng 24 debug: enabled: false
Bật Hubble UI (default)	# Dòng 1202 hubble: enabled: true ---------------- # Dòng 1498 Enable Hubble Relay relay: enabled: false ---------------- # Dòng 1723 Hubble UI ui: # -- Whether to enable the Hubble UI. enabled: true # Dòng 1891: Mục đích là để vào Hubble UI từ IP Loadbalancer service: type: NodePort
Tắt kube-proxy (nên làm bước cuối)	kubectl -n kube-system delete ds kube-proxy kubectl -n kube-system delete cm kube-proxy kubeProxyReplacement: "true" helm upgrade cilium cilium/ --namespace kube-system --create-namespace --values values.yaml sleep 10 kubectl -n kube-system rollout restart deployment cilium-operator kubectl -n kube-system rollout restart daemonset cilium
Bật Audit mode – lưu log kết nối pod-to-pod để xem khi nào deny, allow. Thuận tiện tra cứu bằng kubectl hoặc hubble	policyAuditMode: true #(restart deployment/daemonset để apply) Check sau khi apply kubectl -n kube-system exec cilium-xxxxx –huble observe flows –t policy-verdict –last 1

Để cài cilium, ta cần chuẩn bị cluster chưa cài CNI (container network interface) với status của node là NotReady. Nếu đã có pod kube-proxy thì clium sẽ control nó. Còn nếu ko có kube-proxy thì cilium sẽ hoạt động độc lập thay cho kube-proxy.

https://docs.cilium.io/en/stable/gettingstarted/k8s-install-default/#install-the-cilium-cli

CILIUM_CLI_VERSION=$(curl -s https://raw.githubusercontent.com/cilium/cilium-cli/main/stable.txt)

CLI_ARCH=amd64

if [ "$(uname -m)" = "aarch64" ]; then CLI_ARCH=arm64; fi

curl -L --fail --remote-name-all https://github.com/cilium/cilium-cli/releases/download/${CILIUM_CLI_VERSION}/cilium-linux-${CLI_ARCH}.tar.gz{,.sha256sum}

sha256sum --check cilium-linux-${CLI_ARCH}.tar.gz.sha256sum

sudo tar xzvfC cilium-linux-${CLI_ARCH}.tar.gz /usr/local/bin

rm cilium-linux-${CLI_ARCH}.tar.gz{,.sha256sum}

cilium install --version 1.18.1

cilium status --wait

cilium hubble enable

1.3 Cài đặt Hubble Cli

https://docs.cilium.io/en/stable/observability/hubble/setup/#install-the-hubble-client

HUBBLE_VERSION=$(curl -s https://raw.githubusercontent.com/cilium/hubble/master/stable.txt)

HUBBLE_ARCH=amd64

if [ "$(uname -m)" = "aarch64" ]; then HUBBLE_ARCH=arm64; fi

curl -L --fail --remote-name-all https://github.com/cilium/hubble/releases/download/$HUBBLE_VERSION/hubble-linux-${HUBBLE_ARCH}.tar.gz{,.sha256sum}

sha256sum --check hubble-linux-${HUBBLE_ARCH}.tar.gz.sha256sum

sudo tar xzvfC hubble-linux-${HUBBLE_ARCH}.tar.gz /usr/local/bin

rm hubble-linux-${HUBBLE_ARCH}.tar.gz{,.sha256sum}

1.3 Một vài lệnh tắt để check cilium

kubectl -n kube-system exec ds/cilium -- cilium-dbg status –verbose #kiểm tra config cilium hiện tại

hoặc

kubectl get cm cilium-config -n kube-system -o yaml | grep -i ingress | grep -i enable-ingress-controller

2. Config cilium

Tắt kube-proxy

kubectl -n kube-system delete ds kube-proxy

kubectl -n kube-system delete cm kube-proxy

# Sửa file values.yaml và upgrade lại helm

Dòng_ 2109: kubeProxyReplacement: "true"

helm upgrade cilium cilium/ --namespace kube-system --create-namespace --values values.yaml

# Sau đó cần resstart lại deployment và daemonset để reload lại cấu hình

kubectl -n kube-system rollout restart deployment cilium-operator

kubectl -n kube-system rollout restart daemonset cilium

# Sau đó kiểm tra:

kubectl -n kube-system exec ds/cilium -- cilium-dbg status --verbose | grep KubeProxyReplacement

3. Network Policy in Cilium

Mẫu về dạng cilium full format with all option:

YAML

apiVersion: "cilium.io/v2"

kind: CiliumNetworkPolicy

metadata:

namespace: "your-namespace"

spec:

endpointSelector:

matchLabels:

app: backend

ingress:

fromEndpoints:

- matchLabels:

app: frontend

"k8s:io.kubernetes.pod.namespace": "another-namespace"

fromCIDR:

- "192.168.1.0/24"

- "2001:db8::/32"

fromEntities:

# - "world" # Bất kỳ IP nào bên ngoài cluster

# - "host" # Host/node cục bộ

# - "cluster" # Bất kỳ IP nào bên trong cluster

# - "remote-node" # Các node khác trong cluster

# - "kube-apiserver" # Kubernetes API server

- "all"

toPorts:

ports:

- port: "8080"

protocol: "TCP"

- port: "8081"

protocol: "UDP"

rules:

dns:

- matchPattern: "*.example.com"

- matchName: "api.cilium.io"

http:

- method: "GET"

path: "/public/.*"

host: "api.example.com"

headers:

- "X-My-Header: true"

- method: "POST"

path: "/private"

kafka:

- role: "produce"

topic: "my-topic"

- role: "consume"

apiKey: "fetch"

egress:

toEndpoints:

- matchLabels:

app: database

toCIDR:

- "10.0.0.0/8"

toEntities:

- "world"

toPorts:

ports:

- port: "5432"

protocol: "TCP"

ports:

- port: "53"

protocol: "UDP"

rules:

dns:

- matchPattern: "*"

Ví dụ 2:

apiVersion: "cilium.io/v2"

kind: CiliumNetworkPolicy

metadata:

namespace: default

spec:

endpointSelector:

matchLabels:

app: myapp

description: "Policy for myapp"

ingress:

- fromEndpoints:

- matchLabels:

app: frontend

toPorts:

- ports:

- port: "80"

protocol: TCP

rules:

http:

- method: "GET"

path: "/api/v1/data"

- fromCIDR:

- 192.168.1.0/24

toPorts:

- ports:

- port: "5432"

protocol: TCP

egress:

- toEndpoints:

- matchLabels:

app: database

toPorts:

- ports:

- port: "5432"

protocol: TCP

- toCIDRSet:

- cidr: 10.0.0.0/8

except:

- 10.0.0.1/32

- toFQDNs:

- matchPattern: "*.example.com"

toPorts:

- ports:

- port: "443"

protocol: TCP

Ví dụ 3

apiVersion: cilium.io/v2

kind: CiliumNetworkPolicy

metadata:

namespace: <namespace>

spec:

endpointSelector:

matchLabels:

<label-key>: <label-value>

ingress:

- fromEndpoints:

- matchLabels:

<label-key>: <label-value>

fromCIDR:

- <CIDR-block>

fromEntities: (e.g., host, world)

- <entity-name>

toPorts:

- ports:

- port: "<port-number>"

protocol: <TCP|UDP|SCTP>

rules:

http:

- method: "<HTTP-method>" # e.g., GET, POST

path: "<path-regex>" # e.g., /api/v1/.*

kafka:

- topic: "<kafka-topic-name>"

apiKeys:

- "<kafka-api-key>"

egress:

- toEndpoints:

- matchLabels:

<label-key>: <label-value>

toCIDR:

- <CIDR-block>

toEntities: (e.g., host, world)

- <entity-name>

toPorts:

- ports:

- port: "<port-number>"

protocol: <TCP|UDP|SCTP>

rules:

http:

- method: "<HTTP-method>"

path: "<path-regex>"

kafka:

- topic: "<kafka-topic-name>"

apiKeys:

- "<kafka-api-key>"

toFQDNs: # specific Fully Qualified Domain Names

- matchPattern: "<domain-pattern>" # e.g., *.example.com

toServices: # Allow traffic to specific Services

- serviceName: "<service-name>"

namespace: "<service-namespace>"

Lab chính: Khác NS

Đầu Bài:

- 2 namespace frontend và backend , có pod lần lượt là nginx:80 và tomcat:8080

- Tạo rule deny all cả ingress và egress trên mỗi namespace

- Mở rule cho internet gọi vào service của nginx với port 30080

- Mở rule nginx có thể gọi tomcat service với port 8080

- Lệnh debug nếu rule chưa mở hết

Bài Giải:

Lab chính: Cùng NS

Đầu Bài:

- Tạo ns có tên là private-ns, có 1 pod là busybox và 1 pod là nginx

- Tạo rule deny all cả ingress và egress namespace này

- Mở rule làm sao để busybox gọi được nginx

- Lệnh debug nếu rule chưa mở hết

Bài Giải:

Phần 3.1 Lab Loại 1

Lab1

Case 2: Basic pod to pod

frontend, backend, db. Nhưng hiện tại frontend vẫn gọi đc DB. Cần chặn lại và chỉ cho backend gọi. Cách làm:

1. Chặn toàn bộ traffic trên ns db

2. Chỉ mở traffic cho backend gọi DB

apiVersion: cilium.io/v2

kind: CiliumNetworkPolicy

metadata:

namespace: prod

spec:

endpointSelector:

matchLabels:

role: db

ingress:

- fromEndpoints:

- matchLabels:

role: backend

Case 3: matchExpressions tự do

Ta muốn thêm 1 yêu cầu đặc biệt từ yaml

apiVersion: cilium.io/v2

kind: CiliumNetworkPolicy

metadata:

namespace: staging

spec:

endpointSelector:

matchLabels:

role: backend

ingress:

- fromEndpoints:

- matchLabels:

role: frontend

matchExpressions:

- key: k8s:io.kubernetes.pod.namespace

operator: In

values:

- staging

- prod

apiVersion: "cilium.io/v2"

kind: CiliumNetworkPolicy

metadata:

spec:

# Áp dụng chính sách này cho các pod thỏa mãn tất cả các điều kiện sau

endpointSelector:

matchExpressions:

- key: app

operator: In

values:

- web-server

- frontend

- key: env

operator: NotIn

values:

- dev

- key: owner

operator: Exists

- key: test

operator: DoesNotExist

ingress:

- fromEndpoints:

- matchExpressions:

- key: app

operator: In

values:

- monitor

- logger

- key: security-level

operator: Exists

egress:

- toEndpoints:

- matchExpressions:

- key: tier

operator: In

values:

- database

- key: db-version

operator: NotIn

values:

- 1.0

Case 4: Egress basic

apiVersion: cilium.io/v2

kind: CiliumNetworkPolicy

metadata:

namespace: prod

spec:

endpointSelector:

matchLabels:

role: frontend

egress:

- toEndpoints:

- matchLabels:

role: backend

Case 5: Allow all 1 namespace

Riêng môi trường namesapce dev, mở all traffic tất cả các pod

apiVersion: cilium.io/v2

kind: CiliumNetworkPolicy

metadata:

namespace: dev

spec:

endpointSelector: {}

ingress:

- fromEndpoints:

- matchLabels: {}

egress:

- toEndpoints:

- matchLabels: {}

Case 6 matchLabels và matchExpression

# k get pod -n prod --show-labels

NAME READY STATUS RESTARTS AGE LABELS

backend 1/1 Running 0 21m role=backend

db 1/1 Running 0 21m role=db

frontend 1/1 Running 0 21m role=frontend

inventory 1/1 Running 0 3m38s role=inventory

orders 1/1 Running 0 3m38s role=orders

products 1/1 Running 0 3m37s role=products

In the prod namespace, several new pods including orders, inventory, and products have been created.

Your task is to configure a network policy orders-egress-to-inventory-products with the necessary permissions so that pods with the label role=orders can egress on port 3000 to the inventory pod and product pod.

apiVersion: "cilium.io/v2"

kind: CiliumNetworkPolicy

metadata:

namespace: prod

spec:

endpointSelector:

matchLabels:

role: orders

egress:

- toEndpoints:

- matchExpressions:

- key: role

operator: In

values:

- inventory

- products

- matchLabels:

k8s:io.kubernetes.pod.namespace: kube-system

k8s:k8s-app: kube-dns

toPorts:

- ports:

- port: "3000"

protocol: TCP

Case 7: Egress with 2 endpoint

In admin namespace, allow role=admin to egress on port 4000 to any role=user, and port 5000 to any role=products pods, across all namespaces.

Use name: admin-egress-policy

k -n admin get pod --show-labels

NAME READY STATUS RESTARTS AGE LABELS

admin 1/1 Running 0 3m27s role=admin

apiVersion: cilium.io/v2

kind: CiliumClusterwideNetworkPolicy

metadata:

spec:

endpointSelector:

matchLabels:

role: admin

k8s:io.kubernetes.pod.namespace: admin

egress:

- toEndpoints:

- matchLabels:

role: user

toPorts:

- ports:

- port: "4000"

protocol: TCP

- toEndpoints:

- matchLabels:

role: products

toPorts:

- ports:

- port: "5000"

protocol: TCP

Case 8: Egress with CIDR

k -n prod get pod --show-labels

NAME READY STATUS RESTARTS AGE LABELS

backend 1/1 Running 0 28m role=backend

db 1/1 Running 0 28m role=db

frontend 1/1 Running 0 28m role=frontend

inventory 1/1 Running 0 11m role=inventory

orders 1/1 Running 0 11m role=orders

payment 1/1 Running 0 23s role=payment

products 1/1 Running 0 11m role=products

The payment service (located in the prod namespace) requires communication with an external card validation service, which is accessible at the IP address 200.100.17.1.

Create an egress policy cidr-rule that enables the payment service to send traffic to the external card validation service specifically on port 443.

apiVersion: cilium.io/v2

kind: CiliumNetworkPolicy

metadata:

namespace: prod

spec:

endpointSelector:

matchLabels:

role: payment

egress:

- toCIDR:

- 200.100.17.1/32

toPorts:

- ports:

- port: "443"

protocol: TCP

Case 9: Egress with except CIDR

The payment service must also be configured to communicate with an external fraud detection service located at the IP range 100.10.0.0/24, excluding the address 100.10.0.50.

Add an additional rule to the previously configured policy cidr-rule for the payment service and update it to enable communication with the external fraud detection service on port 3000.

apiVersion: cilium.io/v2

kind: CiliumNetworkPolicy

metadata:

namespace: prod

spec:

endpointSelector:

matchLabels:

role: payment

egress:

- toCIDR:

- 200.100.17.1/32

toPorts:

- ports:

- port: "443"

protocol: TCP

- toCIDRSet:

- cidr: 100.10.0.0/24

except:

- "100.10.0.50/32"

toPorts:

- ports:

- port: "3000"

protocol: TCP

Case 10 :

The payment service must also be configured to communicate with an external fraud detection service located at the IP range 100.10.0.0/24, excluding the address 100.10.0.50.

Add an additional rule to the previously configured policy cidr-rule for the payment service and update it to enable communication with the external fraud detection service on port 3000.

apiVersion: cilium.io/v2

kind: CiliumNetworkPolicy

metadata:

namespace: prod

spec:

endpointSelector:

matchLabels:

role: payment

egress:

- toCIDR:

- 200.100.17.1/32

toPorts:

- ports:

- port: "443"

protocol: TCP

- toCIDRSet:

- cidr: 100.10.0.0/24

except:

- "100.10.0.50/32"

toPorts:

- ports:

- port: "3000"

protocol: TCP

Case 11 Allow al traffic ingress

The end users will interact with the application by accessing the webapp hosted on the product service.

Configure an ingress policy my-policy to allow all traffic from outside the cluster to the products service role=products

apiVersion: "cilium.io/v2"

kind: CiliumNetworkPolicy

metadata:

namespace: prod

spec:

endpointSelector:

matchLabels:

role: products

ingress:

- fromEntities:

- world

Case 12: Allow al traffic egress

In the admin namespace, a monitoring service pod has been set up with role=monitoring. This service will need to talk to all the nodes in the cluster.

Configure an egress policy my-policy to explicitly allow it to talk to all nodes by configuring role=monitoring pods to egress to host and remote-node entities (so they can reach all cluster nodes).

apiVersion: cilium.io/v2

kind: CiliumNetworkPolicy

metadata:

namespace: admin

spec:

endpointSelector:

matchLabels:

role: monitoring

egress:

- toEntities:

- host

- remote-node

Case 13A: HTTP Method

In the prod namespace, configure a network policy my-policy to allow ingress on HTTP port 80 to pods with label role=user from any pod in the same namespace and only for these HTTP methods/paths:

● GET /users

● POST /users

● PATCH /users

● GET /auth/token

apiVersion: cilium.io/v2

kind: CiliumNetworkPolicy

metadata:

namespace: prod

spec:

endpointSelector:

matchLabels:

role: user

ingress:

- fromEndpoints:

- matchLabels: {}

toPorts:

- ports:

- port: "80"

protocol: TCP

rules:

http:

- method: GET

path: /users

- method: POST

path: /users

- method: PATCH

path: /users

- method: GET

path: /auth/token

Case 13B: DNS Method

A warehouse service has been established in the prod namespace.

Configure a policy named my-policy for the warehouse service to enable it to send DNS requests to the kube-dns server located in the kube-system namespace for the following Fully Qualified Domain Names (FQDNs):

● kodekloud.com

● app.kodekloud.com

● api.kodekloud.com

apiVersion: cilium.io/v2

kind: CiliumNetworkPolicy

metadata:

namespace: prod

spec:

endpointSelector:

matchLabels:

app: warehouse

egress:

- toEndpoints:

- matchLabels:

k8s:io.kubernetes.pod.namespace: kube-system

k8s:k8s-app: kube-dns

toPorts:

- ports:

- port: "53"

protocol: ANY

rules:

dns:

- matchName: kodekloud.com

- matchName: app.kodekloud.com

- matchName: api.kodekloud.com

Case 14: Allow all DNS to kube dns server

Let’s make sure that all pods in our cluster can talk to the kube-dns server.

Create a CiliumClusterwideNetworkPolicy with name: allow-dns-clusterwide to allow all pods to egress DNS queries (port 53 ANY, any FQDN) to the kube-dns server.

apiVersion: cilium.io/v2

kind: CiliumClusterwideNetworkPolicy

metadata:

spec:

endpointSelector: {}

egress:

- toEndpoints:

- matchLabels:

k8s:io.kubernetes.pod.namespace: kube-system

k8s:k8s-app: kube-dns

toPorts:

- ports:

- port: "53"

protocol: ANY

rules:

dns:

- matchPattern: "*"

Phần 3.2 Lab Loại 2

Case 2:

In the video-app namespace, an upload pod should only egress to video-encoding on TCP port 5000. The existing policy allows port 4000, so upload cannot reach video-encoding on the correct port.

Update the my-policy CiliumNetworkPolicy so that port 5000 is permitted.

apiVersion: cilium.io/v2

kind: CiliumNetworkPolicy

metadata:

namespace: video-app

spec:

endpointSelector:

matchLabels:

role: upload

egress:

- toEndpoints:

- matchLabels:

role: video-encoding

toPorts:

- ports:

- port: "5000"

protocol: TCP

Case 3:

In the video-app namespace, the subscription pod should only receive TCP port 80 traffic from pods labeled role=content-access. For some reason, all pods are still able to communicate with the subscription service. Find out the cause and update my-policy accordingly.

apiVersion: cilium.io/v2

kind: CiliumNetworkPolicy

metadata:

namespace: video-app

spec:

endpointSelector:

matchLabels:

role: subscription

ingress:

- fromEndpoints:

- matchLabels:

role: content-access

toPorts:

- ports:

- port: "80"

protocol: TCP

Case 4:

The admin pod in the admin namespace must connect to the content-management pod in video-app on TCP port 443. Two policies exist: content-management-policy (in video-app) and admin-policy (also in video-app).

Figure out why the admin service can’t talk to the content-management service.

apiVersion: cilium.io/v2

kind: CiliumNetworkPolicy

metadata:

namespace: video-app

spec:

endpointSelector:

matchLabels:

role: content-management

ingress:

- fromEndpoints:

- matchLabels:

role: admin

k8s:io.kubernetes.pod.namespace: admin

toPorts:

- ports:

- port: "443"

protocol: TCP

apiVersion: cilium.io/v2

kind: CiliumNetworkPolicy

metadata:

namespace: admin

spec:

endpointSelector:

matchLabels:

role: admin

egress:

- toEndpoints:

- matchLabels:

role: content-management

k8s:io.kubernetes.pod.namespace: video-app

toPorts:

- ports:

- port: "443"

protocol: TCP

Case 5:

The subscription service in the video-app namespace communicates with the notification service on port 3000 in the video-app namespace.

Recently, an engineer implemented an egress policy for the subscription service to permit egress traffic to the notification service. However, after applying the policy, the application encountered issues. The engineer confirmed that the subscription service could access the notification service Pod’s IP on port 3000, yet the application remained non-functional.

Review and fix the policy subscription-policy.

apiVersion: cilium.io/v2

kind: CiliumClusterwideNetworkPolicy

metadata:

namespace: video-app

spec:

endpointSelector:

matchLabels:

role: subscription

egress:

- toEndpoints:

- matchLabels:

k8s:io.kubernetes.pod.namespace: kube-system

k8s:k8s-app: kube-dns

toPorts:

- ports:

- port: "53"

protocol: ANY

rules:

dns:

- matchPattern: "*"

- toEndpoints:

- matchLabels:

role: notification

toPorts:

- ports:

- port: "3000"

protocol: TCP

Case 6:

A cluster-wide policy named external-lockdown is currently blocking all external ingress (fromEntities: world), but it’s also preventing pods from talking to each other internally. Update external-lockdown so it continues to block external traffic yet allows intra-cluster pod-to-pod communication.

apiVersion: cilium.io/v2

kind: CiliumClusterwideNetworkPolicy

metadata:

spec:

endpointSelector: {}

ingressDeny:

- fromEntities:

- world

ingress:

- fromEntities:

- all

4. Service Mesh

4.1 Cilium Ingress

https://docs.cilium.io/en/stable/network/servicemesh/ingress/

Để chạy được CiliumIngress ta cần mở những tính năng sau:

- nodePort.enabled=true #Dòng 2270

- kubeProxyReplacement=true

- l7Proxy=true (enabled by default).

- ingressController.enabled=true #dòng 905

- ingressController.default=true #dòng 911 dùng để làm defaut ingress

- ingressController.loadbalancerMode=shared

helm upgrade cilium cilium/ --namespace kube-system --create-namespace --values values.yaml

kubectl -n kube-system rollout restart deployment cilium-operator

kubectl -n kube-system rollout restart daemonset cilium

# k get ingressclasses.networking.k8s.io

NAME CONTROLLER PARAMETERS AGE

cilium cilium.io/ingress-controller <none> 64s

nginx k8s.io/ingress-nginx <none> 214d

Ví dụ 1

#1. Deployment (nginx)

apiVersion: apps/v1

kind: Deployment

metadata:

labels:

app: nginx

spec:

replicas: 2

selector:

matchLabels:

app: nginx

template:

metadata:

labels:

app: nginx

spec:

containers:

- name: nginx

image: nginx:1.25

ports:

- containerPort: 80

#2. Service (ClusterIP)

apiVersion: v1

kind: Service

metadata:

labels:

app: nginx

spec:

selector:

app: nginx

ports:

- port: 80

targetPort: 80

protocol: TCP

#3. Ingress

apiVersion: networking.k8s.io/v1

kind: Ingress

metadata:

spec:

ingressClassName: cilium

rules:

- host: nginx.local

http:

paths:

- path: /

pathType: Prefix

backend:

service:

port:

number: 80

Ví dụ 2:

In our cluster, we are hosting two applications: funchat.com and streameasy.com. Create an Ingress rule named multi-app-ingress in the default namespace with the following routing configurations:

Route funchat.com/auth to the service chat-auth

Route funchat.com/messages to the service chat-messages

Route streameasy.com/video to the service streameasy-video

Route streameasy.com/moderation to the service streameasy-moderation

apiVersion: networking.k8s.io/v1

kind: Ingress

metadata:

namespace: default

spec:

ingressClassName: cilium # optional if Cilium is set as the default

rules:

- host: funchat.com

http:

paths:

- path: /auth

pathType: Prefix

backend:

service:

port:

number: 80

- path: /messages

pathType: Prefix

backend:

service:

port:

number: 80

- host: streameasy.com

http:

paths:

- path: /video

pathType: Prefix

backend:

service:

port:

number: 80

- path: /moderation

pathType: Prefix

backend:

service:

port:

number: 80

4.2 Cilium GatewayAPI

https://docs.cilium.io/en/stable/network/servicemesh/gateway-api/gateway-api/

Giới hạn của ingress quản lý khó ở các item sau. Vì vậy ta chuyển sang GatewayAPI

Để chạy được CiliumGatewayAPI ta cần mở những tính năng sau:

- nodePort.enabled=true #Dòng 2270

- kubeProxyReplacement=true

- gatewayAPI.enabled=true

- l7Proxy=true (enabled by default).

- Cài https://gateway-api.sigs.k8s.io/guides/?h=crds#getting-started-with-gateway-api Ta chọn bản experimental-install.yaml .

- kubectl apply -f https://github.com/kubernetes-sigs/gateway-api/releases/download/v1.3.0/experimental-install.yaml

Tạo gatewayclass -> tạo gateway -> Tạo HTTPRoute

Sau khi apply gatewayAPI.enabled=true. Ta sẽ có gateway class là cilium được tạo ra

Bài tập 1:

Create a Gateway named my-gateway in the default namespace using the Cilium GatewayClass.

Listeners:

HTTP on port 80

HTTPS on port 443, TLS terminate using stored secret my-cert

Allow routes only from the same namespace.

Sau khi tạo gateway, sẽ có service LB listen dạng clusterIP

apiVersion: gateway.networking.k8s.io/v1beta1

kind: Gateway

metadata:

namespace: default

spec:

gatewayClassName: cilium

listeners:

- name: http

protocol: HTTP

port: 80

allowedRoutes:

namespaces:

from: Same

- name: https

protocol: HTTPS

port: 443

tls:

mode: Terminate

certificateRefs:

- kind: Secret

namespace: default

allowedRoutes:

namespaces:

from: Same

Bài tập 2, tiếp theo

Create an HTTPRoute named multi-app-route in the default namespace bound to my-gateway with the following routing:

Host blog.example.com, paths /home → service blog-home, /api → service blog-api

Host shop.example.com, paths /cart → service shop-cart, /checkout → service shop-checkout

apiVersion: gateway.networking.k8s.io/v1beta1

kind: HTTPRoute

metadata:

namespace: default

spec:

parentRefs:

- name: my-gateway

rules:

# Blog routes

- matches:

- path:

type: PathPrefix

value: /home

headers:

- name: Host

value: blog.example.com

backendRefs:

- name: blog-home

kind: Service

port: 80

- matches:

- path:

type: PathPrefix

value: /api

headers:

- name: Host

value: blog.example.com

backendRefs:

- name: blog-api

kind: Service

port: 80

# Shop routes

- matches:

- path:

type: PathPrefix

value: /cart

headers:

- name: Host

value: shop.example.com

backendRefs:

- name: shop-cart

kind: Service

port: 80

- matches:

- path:

type: PathPrefix

value: /checkout

headers:

- name: Host

value: shop.example.com

backendRefs:

- name: shop-checkout

kind: Service

port: 80

4.3 NetworkPolicy cho Ingress và GatewayAPI

Policy này có vẻ chưa ngon, cần test lại

apiVersion: "cilium.io/v2"

kind: CiliumClusterwideNetworkPolicy

metadata:

spec:

description: "Allow Traffic from outside world to ingress"

endpointSelector: {}

ingress:

- fromEntities:

- world

apiVersion: cilium.io/v2

kind: CiliumClusterwideNetworkPolicy

metadata:

spec:

description: "Allow all the egress traffic from reserved ingress identity to any endpoints in the cluster"

endpointSelector:

matchExpressions:

- key: reserved:ingress

operator: Exists

egress:

- toEntities:

- cluster

4.4 Cilium Encryption

Link dẫn chiếu: https://docs.cilium.io/en/latest/security/network/encryption-ipsec/

Chức năng Encrypt này chỉ có tác dụng khi pod gọi pod giữa 2 hoặc nhiều cluster với nhau. Trường hợp trong cùng 1 cluster thì không có tác dụng mã hóa.

kubectl create -n kube-system secret generic cilium-ipsec-keys --from-literal=keys="3+ rfc4106(gcm(aes)) $(dd if=/dev/urandom count=20 bs=1 2> /dev/null | xxd -p -c 64) 128"

#Sửa file values.yaml những vị trí sau

encryption.enabled=true

encryption.type=ipsec

4.5 mTLS

Linh gốc: https://docs.cilium.io/en/stable/network/servicemesh/mutual-authentication/mutual-authentication/

Để bật mTLS ta cần sửa file values.yaml những hạng mục sau

encryption.enabled=true

authentication.enable=true

authentication.mutual.spire.enabled=true

authentication.mutual.spire.install.enabled=true

Thực hiện upgrade và reload ds/deployemtn

5. Cluster Mesh

6. Observability

Toàn bộ tài liệu hay về hubble https://docs.cilium.io/en/stable/observability/hubble/

Trước tiên ta phải bật Hubble, Hubble relay, hubble ui trong file helm

# Dòng 1202

hubble:

enabled: true

# Dòng 1498 Enable Hubble Relay

relay:

enabled: false

# Dòng 1723 Hubble UI

ui:

# -- Whether to enable the Hubble UI.

enabled: true

Sau đó ta cần bật API. Có 2 cách để bật hubble API

cilium hubble port-forward

HOẶC

kubectl -n kube-system port-forward service/hubble-relay 4245:80

Sau đó ta check bằng lệnh #hubble status (lệnh hơi lâu, mới chạy đc ra kết quả ok)

hubble status

hubble observe --pod xxxxxx

Chú ý: mặc định hubble chỉ tracing L3,L4 nếu muốn trace L7 ta phải định nghĩa network policy có gắn với L7 (GET/POST/PUT/DELETE…)

Ví dụ để trace về L7

apiVersion: cilium.io/v2

kind: CiliumNetworkPolicy

metadata:

spec:

endpointSelector:

matchLabels:

run: backend

ingress:

- fromEndpoints:

- matchLabels:

run: frontend

toPorts:

- ports:

- port: "80"

protocol: TCP

rules:

http:

- method: GET

- method: POST

- method: PATCH

- method: PUT

hubble observe --pod backend | grep GET

Oct 12 18:19:08.199: default/frontend:48188 (ID:26240) -> default/backend:80 (ID:62209) http-request FORWARDED (HTTP/1.1 GET http://10.0.0.105/)

Oct 12 18:19:08.200: default/frontend:48188 (ID:26240) <- default/backend:80 (ID:62209) http-response FORWARDED (HTTP/1.1 200 2ms (GET http://10.0.0.105/))

6. BGP & Extend Networking

6.1 EgressGateway

Mở EgressGateway

#---vim values.yaml

bpf:

masquerade: true

kubeProxyReplacement: "true"

egressGateway:

# -- Enables egress gateway to redirect and SNAT the traffic that leaves the

# cluster.

enabled: true

helm upgrade cilium cilium/cilium -n kube-system -f values.yaml

sleep 10

kubectl rollout restart deploy cilium-operator -n kube-system

kubectl rollout restart ds cilium -n kube-system

Lab1:

Đứng từ pod-1 ở master-node1 này. Ping đến pod-1 ở worker-node1 kia. Sau đó tcpdump tại node kia xem nguồn xuất phát từ đâu

sudo tcpdump -i any -n -A 'port 80'

Kết quả:

Làm ngược lại với pod tương tự

Kết quả:

Lab2:
Từ lab1, chúng ta muốn force toàn bộ nguồn traffic từ worker-node1 dù có thử cách nào. Hãy thử bằng egressGateway

Bước 1. Mở egress như hướng dẫn trên

Bước 2: gán nhãn cho node để xác định node nào mở egressGW: kubectl label node node01 egress-gateway=true

Bước 3: Tạo EgressGatewayPolicy

Policy này sẽ force toàn bộ pod có nhãn là app-node1 có traffic đi ra phải theo worker-node có nhãn là egress-gateway=true

apiVersion: cilium.io/v2

kind: CiliumEgressGatewayPolicy

metadata:

spec:

selectors:

- podSelector:

matchLabels:

app: app-node1

destinationCIDRs:

- "0.0.0.0/0"

egressGateway:

nodeSelector:

matchLabels:

egress-gateway: "true"

egressIP: <NODE01_IP-Cái Này cần đổi IP của node>

Bước 4. Thực hiện ping thử lại như Lab1. Ta sẽ thấy source đi ra luôn là worker-node1

Thứ Năm, 22 tháng 8, 2002

Cilium (updating...)

1.3 Cài đặt Hubble Cli

6.1 EgressGateway

6.2 LoadBalancer IPAM

6.3 BGP

6.4 L2 Announcement

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