Traffic Balancers
You set up traffic balancers by placing a routing node in front of backend servers. This node takes incoming requests and spreads them across healthy hosts using health checks. Most teams start by giving admin roles full control over routing rules and backend pools. Overly broad roles let one bad change expose internal ports or break live apps. How traffic balancers route requests in your setup Traffic balancers sit between client networks and your backend server groups. A client sends a requ
East-West Traffic Security: the complete guide
Architecture patterns, implementation strategies, and security best practices. Delivered to your inbox.
You set up traffic balancers by placing a routing node in front of backend servers. This node takes incoming requests and spreads them across healthy hosts using health checks. Most teams start by giving admin roles full control over routing rules and backend pools. Overly broad roles let one bad change expose internal ports or break live apps.
How traffic balancers route requests in your setup
Traffic balancers sit between client networks and your backend server groups. A client sends a request to a single public or internal IP address. The balancer reads the network headers or app path to pick a destination host. It checks a list of active servers before it forwards any packet.
Health checks run on a fixed timer to test each backend server. The balancer sends a small ping or request to a set port on each host. If a host fails to reply in time, the balancer stops sending traffic there. Once the host passes the check again, it rejoins the active pool.
Teams choose between two main routing modes for their workloads. Network mode routes packets based on IP addresses and TCP or UDP ports. App mode reads HTTP headers, paths, and cookies to make routing choices. Both modes rely on security groups and role rules to control who can edit settings.
In a standard setup, platform admins manage the listeners and target groups. Developers ask for new routes when they ship a new service. Admins update the rules and attach TLS certs to handle encrypted traffic at the edge.
What native routing solves and what it leaves open
Native traffic balancers keep apps online when single servers fail or restart. They spread heavy load so no single machine runs out of memory or CPU. They also give teams one place to manage TLS certs and public IP addresses. Network firewall rules around the balancer block unwanted ports from the public internet.
Still, network routing only decides which machine gets a packet. It does not inspect what a user or service does inside an active session. Once a connection passes the balancer, the user interacts directly with the backend host or database. A valid network route cannot tell a safe query from a destructive command.
East-West Traffic Security: architecture patterns and best practices
Continue reading? Get the full guide.
Free. No spam. Unsubscribe anytime.
This gap matters when engineers need direct access to internal services for fixes. Teams often open internal balancer ports to a whole office network or VPN subnet. Anyone on that subnet can reach the database port or admin interface. They still log in with shared keys or long-lived passwords stored on their laptops.
Native balancer logs also stop at the network or basic HTTP header level. They record source IPs, response codes, and byte counts for each request. They do not record the SQL statements, shell commands, or sensitive fields returned in results. If a query returns emails, phone numbers, or card numbers, the balancer sends them untouched.
Managing permissions and internal routing safely
To reduce risk, teams split public app traffic from internal admin traffic. Public traffic flows through external balancers with strict port rules and web filters. Internal admin traffic needs stricter controls that check user identity and session actions. Separating these paths stops admin ports from sitting on public listeners by mistake.
Teams should also lock down the cloud roles that can change balancer rules. Only automated build pipelines and senior platform roles should edit listener settings. Every rule change should go through a peer review step before it goes live. This habit prevents accidental exposure of private backend pools to wide network ranges.
Govern statements and responses across databases and APIs
Good config and scoped roles are needed setup. They do not check single queries in flight or mask sensitive fields in returned rows. Across Postgres, MySQL, SQL Server, MongoDB, ClickHouse, Kubernetes APIs, SSH, and internal HTTP endpoints, hoop.dev runs beside each supported service as an open-source proxy, a sidecar for your database or API.
First, hoop.dev guardrails block banned queries before they run. Then hoop.dev data masking rewrites matched sensitive values in responses in memory. The audit trail records every statement and verdict per resource. Furthermore, hoop.dev holds SOC 2 Type II and is open source on GitHub.
Frequently asked questions
What is the difference between network and app traffic balancers?
Network balancers route traffic using IP addresses and TCP or UDP ports. App balancers inspect HTTP headers and URL paths to send requests to specific services.
Do traffic balancers replace database access controls?
No, they only route network packets to healthy database nodes. They do not manage database users, check SQL queries, or rewrite sensitive data in results.
How do health checks prevent downtime during deploys?
The balancer tests new servers before sending live user requests to them. It also drains active connections from old servers before those machines shut down.