mirror of https://github.com/hashicorp/consul
71 lines
2.5 KiB
Markdown
71 lines
2.5 KiB
Markdown
---
|
|
layout: docs
|
|
page_title: Connect - Development and Debugging
|
|
sidebar_title: Develop and Debug
|
|
description: >-
|
|
It is often necessary to connect to a service for development or debugging. If
|
|
a service only exposes a Connect listener, then we need a way to establish a
|
|
mutual TLS connection to the service. The `consul connect proxy` command can
|
|
be used for this task on any machine with access to a Consul agent (local or
|
|
remote).
|
|
---
|
|
|
|
# Developing and Debugging Connect Services
|
|
|
|
It is often necessary to connect to a service for development or debugging.
|
|
If a service only exposes a Connect listener, then we need a way to establish
|
|
a mutual TLS connection to the service. The
|
|
[`consul connect proxy` command](/commands/connect/proxy) can be used
|
|
for this task on any machine with access to a Consul agent (local or remote).
|
|
|
|
Restricting access to services only via Connect ensures that the only way to
|
|
connect to a service is through valid authorization of the
|
|
[intentions](/docs/connect/intentions). This can extend to developers
|
|
and operators, too.
|
|
|
|
## Connecting to Connect-only Services
|
|
|
|
As an example, let's assume that we have a PostgreSQL database running that
|
|
we want to connect to via `psql`, but the only non-loopback listener is
|
|
via Connect. Let's also assume that we have an ACL token to identify as
|
|
`operator-mitchellh`. We can start a local proxy:
|
|
|
|
```shell-session
|
|
$ consul connect proxy \
|
|
-service operator-mitchellh \
|
|
-upstream postgresql:8181
|
|
```
|
|
|
|
This works because the source `-service` does not need to be registered
|
|
in the local Consul catalog. However, to retrieve a valid identifying
|
|
certificate, the ACL token must have `service:write` permissions. This
|
|
can be used as a sort of "debug service" to represent people, too. In
|
|
the example above, the proxy is identifying as `operator-mitchellh`.
|
|
|
|
With the proxy running, we can now use `psql` like normal:
|
|
|
|
```shell-session
|
|
$ psql -h 127.0.0.1 -p 8181 -U mitchellh mydb
|
|
>
|
|
```
|
|
|
|
This `psql` session is now happening through our local proxy via an
|
|
authorized mutual TLS connection to the PostgreSQL service in our Consul
|
|
catalog.
|
|
|
|
### Masquerading as a Service
|
|
|
|
You can also easily masquerade as any source service by setting the
|
|
`-service` value to any service. Note that the proper ACL permissions are
|
|
required to perform this task.
|
|
|
|
For example, if you have an ACL token that allows `service:write` for
|
|
`web` and you want to connect to the `postgresql` service as "web", you
|
|
can start a proxy like so:
|
|
|
|
```shell-session
|
|
$ consul connect proxy \
|
|
-service web \
|
|
-upstream postgresql:8181
|
|
```
|