Skillshub k8s-cilium

Cilium & Hubble Network Observability

install

source · Clone the upstream repo

git clone https://github.com/ComeOnOliver/skillshub

Claude Code · Install into ~/.claude/skills/

T=$(mktemp -d) && git clone --depth=1 https://github.com/ComeOnOliver/skillshub "$T" && mkdir -p ~/.claude/skills && cp -r "$T/skills/rohitg00/kubectl-mcp-server/k8s-cilium" ~/.claude/skills/comeonoliver-skillshub-k8s-cilium && rm -rf "$T"

manifest: skills/rohitg00/kubectl-mcp-server/k8s-cilium/SKILL.md

source content

Cilium & Hubble Network Observability

Manage eBPF-based networking using kubectl-mcp-server's Cilium tools (8 tools).

When to Apply

Use this skill when:

User mentions: "Cilium", "Hubble", "eBPF", "network policy", "flow"
Operations: network policy management, traffic observation, L7 filtering
Keywords: "network security", "traffic flow", "dropped packets", "connectivity"

Priority Rules

Priority	Rule	Impact	Tools
1	Detect Cilium installation first	CRITICAL	`cilium_detect_tool`
2	Check agent status for health	HIGH	`cilium_status_tool`
3	Use Hubble for flow debugging	HIGH	`hubble_flows_query_tool`
4	Start with default deny	MEDIUM	CiliumNetworkPolicy

Quick Reference

Task	Tool	Example
Detect Cilium	`cilium_detect_tool`	`cilium_detect_tool()`
Agent status	`cilium_status_tool`	`cilium_status_tool()`
List policies	`cilium_policies_list_tool`	`cilium_policies_list_tool(namespace)`
Query flows	`hubble_flows_query_tool`	`hubble_flows_query_tool(namespace)`

Check Installation

cilium_detect_tool()

Cilium Status

cilium_status_tool()

Network Policies

List Policies

cilium_policies_list_tool(namespace="default")

Get Policy Details

cilium_policy_get_tool(name="allow-web", namespace="default")

Create Cilium Network Policy

kubectl_apply(manifest="""
apiVersion: cilium.io/v2
kind: CiliumNetworkPolicy
metadata:
  name: allow-web
  namespace: default
spec:
  endpointSelector:
    matchLabels:
      app: web
  ingress:
  - fromEndpoints:
    - matchLabels:
        app: frontend
    toPorts:
    - ports:
      - port: "80"
        protocol: TCP
  egress:
  - toEndpoints:
    - matchLabels:
        app: database
    toPorts:
    - ports:
      - port: "5432"
        protocol: TCP
""")

Endpoints

cilium_endpoints_list_tool(namespace="default")

Identities

cilium_identities_list_tool()

Nodes

cilium_nodes_list_tool()

Hubble Flow Observability

hubble_flows_query_tool(
    namespace="default",
    pod="my-pod",
    last="5m"
)

hubble_flows_query_tool(
    namespace="default",
    verdict="DROPPED"
)

hubble_flows_query_tool(
    namespace="default",
    type="l7"
)

Create L7 Policy

kubectl_apply(manifest="""
apiVersion: cilium.io/v2
kind: CiliumNetworkPolicy
metadata:
  name: api-policy
  namespace: default
spec:
  endpointSelector:
    matchLabels:
      app: api
  ingress:
  - fromEndpoints:
    - matchLabels:
        app: frontend
    toPorts:
    - ports:
      - port: "8080"
        protocol: TCP
      rules:
        http:
        - method: GET
          path: "/api/v1/.*"
        - method: POST
          path: "/api/v1/users"
""")

Cluster Mesh

kubectl_apply(manifest="""
apiVersion: cilium.io/v2
kind: CiliumClusterwideNetworkPolicy
metadata:
  name: allow-cross-cluster
spec:
  endpointSelector:
    matchLabels:
      app: shared-service
  ingress:
  - fromEntities:
    - cluster
    - remote-node
""")

Troubleshooting Workflows

Pod Can't Reach Service

cilium_status_tool()
cilium_endpoints_list_tool(namespace)
cilium_policies_list_tool(namespace)
hubble_flows_query_tool(namespace, pod, verdict="DROPPED")

Policy Not Working

cilium_policy_get_tool(name, namespace)
cilium_endpoints_list_tool(namespace)
hubble_flows_query_tool(namespace)

Network Performance Issues

cilium_status_tool()
cilium_nodes_list_tool()
hubble_flows_query_tool(namespace, type="l7")

Best Practices

Start with default deny: Create baseline deny-all policy
Use labels consistently: Policies rely on label selectors
Monitor with Hubble: Observe flows before/after policy changes
Test in staging: Verify policies don't break connectivity

Prerequisites

Cilium: Required for all Cilium tools
```
cilium install
```

Related Skills

k8s-networking - Standard K8s networking
k8s-security - Security policies
k8s-service-mesh - Istio service mesh