kubernetes 的TCP 数据包可视化
kubernetes 的TCP 数据包可视化
k8spacket是用 Golang 编写的工具，它使用gopacket第三方库来嗅探工作负载（传入和传出）上的 TCP 数据包。它在运行的容器网络接口上创建 TCP 侦听器。当 Kubernetes 创建一个新容器时，CNI 插件负责提供与其他容器进行通信的可能性。最常见的方法是用linux namespace隔离网络并用veth pair连接隔离的 namespace 与网桥。除了bridge 类型，CNI 插件还可以使用其他类型（vlan, ipvlan,macvlan)，但都为容器创建了一个网络接口，它是k8spacket嗅探器的主要句柄。
k8spacket有助于了解 Kubernetes 集群中的 TCP 数据包流量：
显示集群中工作负载之间的流量
通知流量在集群外路由到哪里
显示有关连接关闭套接字的信息
显示工作负载发送/接收的字节数
计算建立连接的时间
显示整个集群中工作负载之间的网络连接拓扑
k8spacket是一个 Kubernetes API 客户端，可以将嗅探到的工作负载解析为可视化上可见的集群资源名称（Pods和Services）。它作为DaemonSet Pod启动，使用 hostNetwork，并监听节点上的网络接口。
k8spacket 收集 TCP 流、处理数据，使用 Node Graph API Grafana 数据源插件（详情请查看 Node Graph API 插件），通过 API 展示在Grafana面板。
要安装k8spacket，需要同时安装 Grafana。下面将在Kind安装的 k8s 集群上做演示。
添加 k8spacket 的helm源
[root@k8s-master-1 ~]# helm repo add k8spacket https://k8spacket.github.io/k8spacket-helm-chart
"k8spacket" has been added to your repositories
[root@k8s-master-1 ~]#
[root@k8s-master-1 ~]#
[root@k8s-master-1 ~]#
[root@k8s-master-1 ~]# helm install k8spacket --namespace k8spacket k8spacket/k8spacket --create-namespace
NAME: k8spacket
LAST DEPLOYED: Thu Oct 27 18:48:30 2022
NAMESPACE: k8spacket
STATUS: deployed
REVISION: 1
TEST SUITE: None
NOTES:
1. Get the application URL by running these commands:
export NODE_PORT=$(kubectl get --namespace k8spacket -o jsonpath="{.spec.ports[0].nodePort}" services k8spacket)
export NODE_IP=$(kubectl get nodes --namespace k8spacket -o jsonpath="{.items[0].status.addresses[0].address}")
echo http://$NODE_IP:$NODE_PORT
[root@k8s-master-1 ~]#查看 pod 信息
root@hello:~# kubectl get pod -n k8spacket
NAME READY STATUS RESTARTS AGE
k8spacket-46587 0/1 CrashLoopBackOff 2 (23s ago) 2m24s
k8spacket-9wb5q 0/1 CrashLoopBackOff 1 (6s ago) 2m24s
k8spacket-grh7k 0/1 ImagePullBackOff 0 2m24s
k8spacket-hcgg4 0/1 CrashLoopBackOff 1 (4s ago) 2m24s
k8spacket-ng99p 0/1 CrashLoopBackOff 1 (3s ago) 2m24s
k8spacket-p7hgb 0/1 CrashLoopBackOff 1 (4s ago) 2m24s
k8spacket-pk4zt 0/1 CrashLoopBackOff 1 (4s ago) 2m24s
k8spacket-tcksl 0/1 CrashLoopBackOff 1 (6s ago) 2m24s
k8spacket-tkzcc 0/1 CrashLoopBackOff 1 (8s ago) 2m24s
k8spacket-w8r5r 0/1 CrashLoopBackOff 3 (11s ago) 2m24s
root@hello:~#查看报错为 tunl0 问题
[root@k8s-master-1 ~]# kubectl logs -n k8spacket k8spacket-46587
2022/10/27 13:35:36 Serving requests on port 6676
2022/10/27 13:35:36 Refreshing interfaces for capturing...
2022/10/27 13:35:36 Starting capture on interface "cilium_host"
2022/10/27 13:35:36 Starting capture on interface "tunl0"
2022/10/27 13:35:36 Starting capture on interface "lxc_health"
2022/10/27 13:35:36 Starting capture on interface "cilium_net"
2022/10/27 13:35:36 Starting capture on interface "lxcaaf84592af2d"
2022/10/27 13:35:36 Starting capture on interface "lxcc06519232b44"
2022/10/27 13:35:36 reading in packets
2022/10/27 13:35:36 reading in packets
2022/10/27 13:35:36 error opening pcap handle: tunl0: That device is not up
[root@k8s-master-1 ~]#修改配置
# 将 charts 包拉取到本地 在进行修改信息
[root@k8s-master-1 ~]# cd /tmp/
[root@k8s-master-1 tmp]# helm fetch k8spacket/k8spacket
[root@k8s-master-1 tmp]# tar -zxf k8spacket-0.1.3.tgz
[root@k8s-master-1 tmp]# cd k8spacket
# 设置配置为
command: "ip address | grep @ | grep -v tunl0 | sed -E 's/.* (\\w+)@.*/\\1/' | tr '\\n' ',' | sed 's/.$//'"
# 完整配置如下
[root@k8s-master-1 k8spacket]# vim values.yaml
[root@k8s-master-1 k8spacket]# cat values.yaml
replicaCount: 1
affinity: {}
image:
repository: docker.io/k8spacket/k8spacket
pullPolicy: IfNotPresent
serviceAccount:
create: true
# Annotations to add to the service account
annotations: {}
clusterRole:
create: true
nodeSelector: {}
podAnnotations: {}
priorityClassName: ""
podSecurityContext:
runAsUser: 1000
securityContext:
allowPrivilegeEscalation: true
capabilities:
add: [ "NET_ADMIN", "NET_RAW" ]
service:
type: ClusterIP
port: 8080
nodePort:
resources:
requests:
memory: "1000Mi"
cpu: "250m"
limits:
memory: "1500Mi"
cpu: "500m"
tolerations: []
k8sPacket:
metrics:
## Hide source port when 'true' (set to string value 'dynamic' instead of decimal real source port) for Prometheus metrics cardinality reasons
hideSourcePort: true
reverseLookup:
## Reverse lookup db file based on GeoLite2 Free Geolocation Data
## See: https://dev.maxmind.com/geoip/geolite2-free-geolocation-data?lang=en
geoipDBPath: "/home/k8spacket/GeoLite2-City.mmdb"
## Whois result match regexp
whoisRegexp: "(?:OrgName:|org-name:)\\s*(.*)"
tcp:
listener:
port: 6676
interfaces:
## Command to achieve containers network interfaces
command: "ip address | grep @ | grep -v tunl0 | sed -E 's/.* (\\w+)@.*/\\1/' | tr '\\n' ',' | sed 's/.$//'"
## How often refresh the list of network interfaces to listen
refreshPeriod: "10s"
assembler:
## See: https://pkg.go.dev/github.com/google/gopacket/tcpassembly#AssemblerOptions
maxPagesPerConnection: 50
maxPagesTotal: 50
## Every (periodDuration) seconds, flush connections that haven't seen activity in the past (closeOlderThanDuration) seconds.
flushing:
periodDuration: "10s"
closeOlderThanDuration: "20s"
[root@k8s-master-1 k8spacket]#重新安装 k8spacket
[root@k8s-master-1 k8spacket]# helm uninstall k8spacket -n k8spacket
[root@k8s-master-1 k8spacket]# helm install k8spacket --namespace k8spacket . --create-namespace
NAME: k8spacket
LAST DEPLOYED: Thu Oct 27 21:47:38 2022
NAMESPACE: k8spacket
STATUS: deployed
REVISION: 1
TEST SUITE: None
NOTES:
1. Get the application URL by running these commands:
export NODE_PORT=$(kubectl get --namespace k8spacket -o jsonpath="{.spec.ports[0].nodePort}" services k8spacket)
export NODE_IP=$(kubectl get nodes --namespace k8spacket -o jsonpath="{.items[0].status.addresses[0].address}")
echo http://$NODE_IP:$NODE_PORT
[root@k8s-master-1 k8spacket]#查看验证
[root@k8s-master-1 ~]# kubectl get pod -n k8spacket -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
k8spacket-8kxnx 1/1 Running 0 4m27s 192.168.1.66 k8s-node-3 <none> <none>
k8spacket-cqpks 1/1 Running 0 4m27s 192.168.1.70 k8s-node-6 <none> <none>
k8spacket-h72fc 1/1 Running 0 4m27s 192.168.1.67 k8s-node-4 <none> <none>
k8spacket-jkxg9 1/1 Running 0 4m27s 192.168.1.75 k8s-node-7 <none> <none>
k8spacket-kgpql 1/1 Running 0 4m27s 192.168.1.62 k8s-master-2 <none> <none>
k8spacket-lf9br 1/1 Running 0 4m27s 192.168.1.61 k8s-master-1 <none> <none>
k8spacket-mcbv5 1/1 Running 0 4m27s 192.168.1.68 k8s-node-5 <none> <none>
k8spacket-ndlzt 1/1 Running 0 4m27s 192.168.1.64 k8s-node-1 <none> <none>
k8spacket-vfg2x 1/1 Running 0 4m27s 192.168.1.63 k8s-master-3 <none> <none>
k8spacket-vvwtr 1/1 Running 0 4m27s 192.168.1.65 k8s-node-2 <none> <none>
[root@k8s-master-1 ~]#
[root@k8s-master-1 ~]# kubectl get svc -n k8spacket -o wide
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE SELECTOR
k8spacket ClusterIP 10.110.30.53 <none> 8080/TCP 4m31s app.kubernetes.io/instance=k8spacket,app.kubernetes.io/name=k8spacket
[root@k8s-master-1 ~]#
访问验证
[root@k8s-master-1 ~]# curl 10.110.30.53:8080/metrics安装 dashboards 配置
[root@k8s-master-1 ~]# cd /tmp/
[root@k8s-master-1 tmp]#
[root@k8s-master-1 tmp]# wget https://github.com/k8spacket/k8spacket/archive/refs/heads/master.zip
[root@k8s-master-1 tmp]# unzip master.zip
[root@k8s-master-1 tmp]#
[root@k8s-master-1 tmp]# cd k8spacket-master
[root@k8s-master-1 k8spacket-master]#
[root@k8s-master-1 k8spacket-master]# kubectl apply -f ./dashboards/
configmap/k8spacket-logs-dashboard created
configmap/k8spacket-metrics-dashboard created
configmap/k8spacket-node-graph-dashboard created
[root@k8s-master-1 k8spacket-master]#安装 Grafana
[root@k8s-master-1 tmp]# helm repo add grafana https://grafana.github.io/helm-charts
"grafana" has been added to your repositories
[root@k8s-master-1 tmp]# helm fetch grafana/grafana
[root@k8s-master-1 tmp]#
[root@k8s-master-1 tmp]# tar -zxf grafana-6.43.1.tgz修改Grafana配置内容
[root@k8s-master-1 tmp]# cd grafana/
[root@k8s-master-1 grafana]#
[root@k8s-master-1 grafana]# vim values.yaml
修改以下配置内容
persistence:
type: pvc
enabled: true
env:
GF_INSTALL_PLUGINS: hamedkarbasi93-nodegraphapi-datasource
dashboardProviders:
dashboardproviders.yaml:
apiVersion: 1
providers:
- name: 'default'
orgId: 1
folder: ''
type: file
disableDeletion: false
editable: true
options:
path: /var/lib/grafana/dashboards/default
dashboardsConfigMaps:
default: k8spacket-node-graph-dashboard
datasources:
nodegraphapi-plugin-datasource.yaml:
apiVersion: 1
datasources:
- name: "Node Graph API"
jsonData:
url: "http://k8spacket.k8spacket.svc.cluster.local:8080"
access: "proxy"
basicAuth: false
isDefault: false
readOnly: false
type: "hamedkarbasi93-nodegraphapi-datasource"
typeLogoUrl: "public/plugins/hamedkarbasi93-nodegraphapi-datasource/img/logo.svg"
typeName: "node-graph-plugin"
orgId: 1
version: 1安装Grafana
[root@k8s-master-1 grafana]# helm install grafana -f values.yaml ./
NAME: grafana
LAST DEPLOYED: Thu Oct 27 22:11:27 2022
NAMESPACE: default
STATUS: deployed
REVISION: 1
NOTES:
1. Get your 'admin' user password by running:
kubectl get secret --namespace default grafana -o jsonpath="{.data.admin-password}" | base64 --decode ; echo
2. The Grafana server can be accessed via port 80 on the following DNS name from within your cluster:
grafana.default.svc.cluster.local
Get the Grafana URL to visit by running these commands in the same shell:
export POD_NAME=$(kubectl get pods --namespace default -l "app.kubernetes.io/name=grafana,app.kubernetes.io/instance=grafana" -o jsonpath="{.items[0].metadata.name}")
kubectl --namespace default port-forward $POD_NAME 3000
3. Login with the password from step 1 and the username: admin
[root@k8s-master-1 grafana]#修改为NodePort
[root@k8s-master-1 grafana]# kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
echo-a ClusterIP 10.108.160.226 <none> 8080/TCP 6d9h
echo-b NodePort 10.108.200.169 <none> 8080:31414/TCP 6d9h
echo-b-headless ClusterIP None <none> 8080/TCP 6d9h
echo-b-host-headless ClusterIP None <none> <none> 6d9h
grafana ClusterIP 10.101.109.183 <none> 80/TCP 4m
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 6d9h
[root@k8s-master-1 grafana]#
[root@k8s-master-1 grafana]# kubectl edit svc grafana
service/grafana edited
[root@k8s-master-1 grafana]#
[root@k8s-master-1 grafana]# kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
echo-a ClusterIP 10.108.160.226 <none> 8080/TCP 6d9h
echo-b NodePort 10.108.200.169 <none> 8080:31414/TCP 6d9h
echo-b-headless ClusterIP None <none> 8080/TCP 6d9h
echo-b-host-headless ClusterIP None <none> <none> 6d9h
grafana NodePort 10.101.109.183 <none> 80:30973/TCP 4m37s
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 6d9h
[root@k8s-master-1 grafana]#查看Grafana密码
[root@k8s-master-1 grafana]# kubectl get secret --namespace default grafana -o jsonpath="{.data.admin-password}" | base64 --decode ; echo
9O1Hd9LOqJ6LKUjZTlEWAGeXRitr0CZd4p6fr00J
[root@k8s-master-1 grafana]#访问地址
访问
http://192.168.1.61:30973/
添加 Node Graph API 插件
http://192.168.1.61:30973/plugins
查看 Node Graph API 数据收集源
http://192.168.1.61:30973/datasources
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