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Add note to manhole.md about bind_address when using with docker (#8526)

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Signed-off-by: Christopher May-Townsend <chris@maytownsend.co.uk>
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Christopher May-Townsend 2020-10-14 15:28:59 +01:00 committed by GitHub
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Added note about docker in manhole.md regarding which ip address to bind to. Contributed by @Maquis196.

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docs/manhole.md
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@ -5,8 +5,45 @@ The "manhole" allows server administrators to access a Python shell on a running
Synapse installation. This is a very powerful mechanism for administration and
debugging.
**_Security Warning_**
Note that this will give administrative access to synapse to **all users** with
shell access to the server. It should therefore **not** be enabled in
environments where untrusted users have shell access.
***
To enable it, first uncomment the `manhole` listener configuration in
`homeserver.yaml`:
`homeserver.yaml`. The configuration is slightly different if you're using docker.
#### Docker config
If you are using Docker, set `bind_addresses` to `['0.0.0.0']` as shown:
```yaml
listeners:
- port: 9000
bind_addresses: ['0.0.0.0']
type: manhole
```
When using `docker run` to start the server, you will then need to change the command to the following to include the
`manhole` port forwarding. The `-p 127.0.0.1:9000:9000` below is important: it
ensures that access to the `manhole` is only possible for local users.
```bash
docker run -d --name synapse \
--mount type=volume,src=synapse-data,dst=/data \
-p 8008:8008 \
-p 127.0.0.1:9000:9000 \
matrixdotorg/synapse:latest
```
#### Native config
If you are not using docker, set `bind_addresses` to `['::1', '127.0.0.1']` as shown.
The `bind_addresses` in the example below is important: it ensures that access to the
`manhole` is only possible for local users).
```yaml
listeners:
@ -15,12 +52,7 @@ listeners:
type: manhole
```
(`bind_addresses` in the above is important: it ensures that access to the
manhole is only possible for local users).
Note that this will give administrative access to synapse to **all users** with
shell access to the server. It should therefore **not** be enabled in
environments where untrusted users have shell access.
#### Accessing synapse manhole
Then restart synapse, and point an ssh client at port 9000 on localhost, using
the username `matrix`: