linkerd2-mock-dst

This repository contains a mock implementation of Linkerd 2's Destination service, intended for proxy testing and benchmarking.

Unlike the real Destination service, which serves service discovery requests from proxies based on information in the Kubernetes API, the mock implementation currently serves a fixed set of destinations and endpoints. In the future, it will also support simulating changes in cluster state for testing purposes.

The mock Destination service may be run in a standalone process as a command-line application. Additionally, it can also be used as a Rust library, to embed a mock Destination service in Rust tests.

Usage

linkerd2-mock-dst 0.1.0
A mock Linkerd 2 Destination server.

USAGE:
    linkerd2-mock-dst [OPTIONS] <DSTS>

FLAGS:
    -h, --help       
            Prints help information

    -V, --version    
            Prints version information


OPTIONS:
    -a, --addr <addr>    
            The address that the mock destination service will listen on [default: 0.0.0.0:8086]


ARGS:
    <DSTS>    
            A list of mock destinations to serve.
            
            This is parsed as a list of `DESTINATION=ENDPOINTS` pairs, where `DESTINATION` is a scheme, DNS name, and
            port, and `ENDPOINTS` is a comma-separated list of socket addresses. Each pair is separated by semicolons.
            [env: LINKERD2_MOCK_DSTS=]

Examples

Mock destinations for the foo.ns.svc.cluster.local service:

:; RUST_LOG=linkerd2_mock_dst=info \
   LINKERD2_MOCK_DSTS='http://foo.ns.svc.cluster.local:8080=127.0.0.1:1234,127.0.0.1:1235;http://bar.ns.svc.cluster.local:8081=127.0.0.1:4321' \
   cargo run

Mock identity for the foo-ns1-ca1 identity name:

:; ls /path/to/identities
foo-ns1-ca1/

:; ls /path/to/identities/foo-ns1-ca1/
crt.pem csr.der key.p8

:; RUST_LOG=linkerd2_mock_dst=info \
   LINKERD2_MOCK_DST_IDENTITIES_DIR='/path/to/identities/' \
   cargo run