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Cilium’s sidecarless service-mesh model removes the need to run a proxy beside every workload; it does not remove proxies from the design. Cilium uses eBPF for network processing, while Envoy handles relevant application-layer traffic such as HTTP and gRPC. The practical lesson for a six-month deployment is to document where Envoy enters the path, verify the cluster prerequisites, and measure your own results rather than assume a performance or reliability gain.
No cluster versions, workload inventory, incident history, or before-and-after measurements are established for the deployment implied by this headline. The guidance below distinguishes documented Cilium behavior from the deployment evidence an engineer would need to support specific production claims.
What “without sidecars” means in Cilium
Cilium divides network work between its eBPF datapath and Envoy. eBPF processes network traffic in the kernel, including IP, TCP, and UDP. Envoy parses application-layer protocols such as HTTP, gRPC, and DNS when a feature requires that visibility or control. This avoids requiring a separate proxy alongside every application pod, but it does not mean every path is proxy-free.
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What a six-month production account needs to establish
“Six months in production” describes a timeframe, not a measured outcome. A useful deployment account should identify what actually ran and what changed over that period. Without that information, claims about savings, performance, reliability, or operational effort cannot be attributed to a particular deployment.
- Environment: Cilium release and installation settings, Kubernetes version, Linux distribution and kernel, cluster topology, and how services were exposed.
- Workload: workload types and placement, traffic volume and protocols, and whether traffic crossed nodes or clusters.
- Features in use: Layer 7 policy, Gateway API, GAMMA routing, mutual authentication, and any other mesh or network-policy control plane.
- Proxy footprint: where Envoy instances ran, which traffic reached them, and what resources they consumed under representative load.
- Measured outcomes: baseline and post-change latency, throughput, resource use, and failure rates, with the measurement method and date.
- Operational record: incidents, alerts, diagnosis steps, configuration changes, and features that were considered but not deployed.
These details separate a team’s observations from Cilium’s documented capabilities. Do not present a product feature description as evidence that a particular cluster achieved a result.
Gateway API adds node and network prerequisites
Cilium’s stable documentation labeled version 1.20.2 lists Gateway API support for GatewayClass, Gateway, HTTPRoute, GRPCRoute, TLSRoute, BackendTLSPolicy, ReferenceGrant, ListenerSet, TCPRoute, and UDPRoute. The documented setup requires kubeProxyReplacement=true and l7Proxy=true. Confirm the supported resources and requirements against the exact Cilium and Gateway API versions you deploy.
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Check the TPROXY path
For Gateway API traffic, Cilium documents transparent forwarding from the Gateway Service to Envoy using TPROXY. With the default bpf.tproxy=false, this implementation uses iptables and requires the relevant netfilter modules. A node missing those dependencies can experience Gateway connection timeouts before traffic reaches Envoy. The documented bpf.tproxy=true alternative uses eBPF instead of the iptables dependency, but is labeled beta in the cited documentation.
Choose and verify an exposure method
The default Gateway API controller creates a LoadBalancer Service. Host-network exposure is another documented option. Whichever method you use, verify that the cluster’s load-balancing and network configuration actually makes the Gateway reachable; the presence of a Gateway resource alone does not establish external connectivity.
Account for ingress identities in policy
Cilium’s ingress and Gateway API traffic passes through a per-node Envoy proxy that can interact with the eBPF policy engine. The ingress path uses a special ingress identity. External traffic is generally classified as world, unless CIDR policy changes that classification.
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Review policy at both points in the path: external traffic to the ingress identity, and ingress traffic to the backend workload identity. A policy that allows only the expected external source and backend may still fail if it does not account for the ingress identity introduced by this path.
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Layer 7 policy changes the traffic path
Adding Cilium Layer 7 policy introduces Envoy into the affected traffic path. That enables application-aware controls and can add HTTP details, including methods and request information, to Hubble flow visibility. It also means proxy placement and behavior are part of the system you are operating; measure resource use and latency in your own environment rather than assuming that the sidecarless design has no proxy cost.
Cilium describes Hubble as providing service maps, flow visibility with identity and label metadata, and protocol-specific insights. These are observability capabilities, not a guarantee that every failure will be immediately identifiable. Validate that the flows and fields your team needs are visible and that operators know how to trace a request across the relevant policy and proxy path.
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Envoy may sanitize headers. Cilium documents trusted-hop Helm settings for handling this behavior, but trusting additional hops has security implications. Configure trust only for known proxy boundaries and verify which client information is safe to rely on.
Mutual authentication is not a complete encryption plan
Cilium’s stable 1.20.2 mutual-authentication documentation labels the feature beta and incomplete. It describes SPIFFE-based identity management and says the feature has been validated with the supplied SPIRE installation; other SPIFFE implementations are not currently supported. It is limited to a Cilium-managed cluster, does not provide a shared trust domain across Cluster Mesh, and does not work with an external mTLS solution.
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The documented roadmap identifies unfinished work including WireGuard integration, per-connection handshakes, security-model documentation, penetration testing, and review for stable maturity. Check the release-specific documentation and compatibility constraints before making this feature a production security dependency.
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Authentication and encryption are distinct requirements. Cilium’s documentation says users need to enable encryption to meet most common service-to-service authentication and encryption requirements, and identifies WireGuard and IPsec as transparent-encryption options. Do not assume that enabling mutual authentication alone encrypts all service traffic.
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Check the exact GAMMA route requirements
Cilium’s GAMMA material describes binding an HTTPRoute or GRPCRoute to a Service as its parent for east-west service-mesh routing. Cilium can intercept Layer 7 traffic to that service and pass it through per-node Envoy. The stable and development documentation reviewed says consumer Routes are not currently supported, so confirm that your route pattern is supported by the release you run before designing around it.
Avoid split-brain Layer 7 policy
Cilium’s development guidance advises against applying Cilium and Istio HTTP Layer 7 policy controls to the same traffic because the two control planes can create conflicting or split-brain behavior. Istio mTLS can also encrypt traffic so Cilium cannot inspect it for Layer 7 policy unless the relevant workloads are configured to make the traffic accessible to Cilium. Configuration differs between Istio sidecar and ambient modes, so use guidance for the exact versions and mode in your cluster.
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Assign policy ownership explicitly: decide which system controls each Layer 7 rule and how encryption affects inspection. Then test the combined path, rather than assuming that two individually valid policies compose safely.
A practical six-month verification plan
- Record the baseline. Capture cluster and kernel versions, Cilium configuration, node layout, proxy placement, service exposure, and the policies already in force.
- Map representative traffic. Identify which flows stay on the eBPF network path and which enter Envoy because of Layer 7 policy, Gateway API, or mesh routing.
- Exercise prerequisites. Verify kube-proxy replacement and L7 proxy settings, TPROXY dependencies on nodes, Gateway reachability, and the policy identities encountered on ingress and backend paths.
- Test security boundaries. Confirm which component owns each policy, whether mTLS traffic remains inspectable where required, and whether authentication and encryption are both configured for the intended flows.
- Measure comparable workloads. Run baseline and post-change measurements with the same workload mix and traffic conditions. Report method, date, environment, and observed values; do not generalize a single test beyond its conditions.
- Keep an incident and change log. Record symptoms, affected paths, evidence used to diagnose them, remediation, and any feature limitations encountered over the deployment period.
The measurements should answer the decision you actually face: whether avoiding per-workload sidecars improves your cluster’s resource footprint or operations, and what proxy, kernel, policy, and Gateway dependencies it adds. Official feature documentation does not provide a fair benchmark against another mesh or dataplane.
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