Part of #7245.
There are still a few places that use 10.88.88.88 that will be harder to
remove. In particular, some of the Python integration tests start up
their own HTTP servers that differ from challtestsrv in some important
way (like timing out requests). Because challtestsrv already binds to
10.77.77.77:80, those test servers need a different IP address to bind
to. We can probably solve that but I'll leave it for another PR.
While working on https://github.com/letsencrypt/boulder/pull/7238, I dug
into why the consul services config has, for example, `[ca-a, ca-b]` in
addition to `[ca1, ca2]`. Boulder test configs use `ca.service.consul`
which will return both CAs (`[ca-a, ca-b]`). For `[ca1, ca2]` though, a
grpc load balancing [integration
test](a55bf19ea0/test/integration-test.py (L121-L143))
individually targets services such as to verify that each backend is
working correctly.
- Fork the default `dns` resolver from `go-grpc` to add backend discovery via
DNS SRV resource records.
- Add new fields for SRV based discovery to `cmd.GRPCClientConfig`
- Add new (optional) field `DNSAuthority` for specifying custom DNS server to
`cmd.GRPCClientConfig`
- Add a utility method to `cmd.GRPCClientConfig` to simplify target URI and host
construction. With three schemes and `DNSAuthority` it makes more sense to
handle all of this parsing and construction outside of the RPC client
constructor.
Resolves#6111
- Add a dedicated Consul container
- Replace `sd-test-srv` with Consul
- Add documentation for configuring Consul
- Re-issue all gRPC credentials for `<service-name>.service.consul`
Part of #6111
forcedebug