Octo-proxy or octo is simple TCP & TLS Proxy with mutual authentication and traffic mirroring/shadowing support.

• Accept TCP connection and forward/mirror it to TCP
• Accept TCP connection and forward/mirror it to TLS (w/ mTLS)
• Accept TLS (w/ mTLS) connection and forward/mirror it to TCP
• Accept TLS (w/ mTLS) connection and forward/mirror it to TLS (w/ mTLS)
• Support for multiple targets, accessed in random order (load balancer)
• Reload configuration or certificate without dropping connection
• Expose metrics that can be consumed by prometheus

octo-proxy -listener 127.0.0.1:8080 -target 127.0.0.1:80

Run with -debug to get a more verbose log output.

// config.yaml
servers:
- name: web-proxy
  listener:
    host: 127.0.0.1
    port: 8080
  targets:
    - host: 127.0.0.1
      port: 80
    - host: 127.0.0.1
      port: 81

metrics:
  host: 0.0.0.0
  port: 9123

octo -config config.yaml

// config.yaml
servers:
- name: web-proxy
  listener:
    host: 0.0.0.0
    port: 8080
    tls:
      mode: mutual
      caCert: /tmp/ca-cert.pem
      cert: /tmp/cert.pem
      key: /tmp/cert-key.pem
  targets:
    - host: 127.0.0.1
      port: 80

metrics:
  host: 0.0.0.0
  port: 9123

octo-proxy -config config.yaml

// config.yaml
servers:
- name: web-proxy
  listener:
    host: 0.0.0.0
    port: 8080
    tls:
      mode: simple
      cert: /tmp/cert.pem
      key: /tmp/cert-key.pem
  targets:
    - host: 127.0.0.1
      port: 80
  mirror:
    host: 172.16.0.1
    port: 80

octo-proxy -config config.yaml

See all configuration in CONFIGURATION.md

After changing configuration or certificates, send signal SIGUSR1 or SIGUSR2 to octo-proxy process. Configuration will be reloaded if the configuration is valid.

Octo-proxy use SO_REUSEPORT to binding the listener, so every reload triggered octo-proxy will create new listener and drop old listener after new listener created, by using this approach octo-proxy can minimize dropped connection when reload triggered.

Metrics are configured through the metrics section in the config file and are served under the /metrics path of the configured host and port.

LICENSE