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< h1 id = "using-the-synapse-manhole" > < a class = "header" href = "#using-the-synapse-manhole" > Using the synapse manhole< / a > < / h1 >
< p > 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.< / p >
< p > < strong > < em > Security Warning< / em > < / strong > < / p >
< p > Note that this will give administrative access to synapse to < strong > all users< / strong > with
shell access to the server. It should therefore < strong > not< / strong > be enabled in
environments where untrusted users have shell access.< / p >
< hr / >
< p > To enable it, first uncomment the < code > manhole< / code > listener configuration in
< code > homeserver.yaml< / code > . The configuration is slightly different if you're using docker.< / p >
< h4 id = "docker-config" > < a class = "header" href = "#docker-config" > Docker config< / a > < / h4 >
< p > If you are using Docker, set < code > bind_addresses< / code > to < code > ['0.0.0.0']< / code > as shown:< / p >
< pre > < code class = "language-yaml" > listeners:
- port: 9000
bind_addresses: ['0.0.0.0']
type: manhole
< / code > < / pre >
< p > When using < code > docker run< / code > to start the server, you will then need to change the command to the following to include the
< code > manhole< / code > port forwarding. The < code > -p 127.0.0.1:9000:9000< / code > below is important: it
ensures that access to the < code > manhole< / code > is only possible for local users.< / p >
< pre > < code class = "language-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
< / code > < / pre >
< h4 id = "native-config" > < a class = "header" href = "#native-config" > Native config< / a > < / h4 >
< p > If you are not using docker, set < code > bind_addresses< / code > to < code > ['::1', '127.0.0.1']< / code > as shown.
The < code > bind_addresses< / code > in the example below is important: it ensures that access to the
< code > manhole< / code > is only possible for local users).< / p >
< pre > < code class = "language-yaml" > listeners:
- port: 9000
bind_addresses: ['::1', '127.0.0.1']
type: manhole
< / code > < / pre >
< h4 id = "accessing-synapse-manhole" > < a class = "header" href = "#accessing-synapse-manhole" > Accessing synapse manhole< / a > < / h4 >
< p > Then restart synapse, and point an ssh client at port 9000 on localhost, using
the username < code > matrix< / code > :< / p >
< pre > < code class = "language-bash" > ssh -p9000 matrix@localhost
< / code > < / pre >
< p > The password is < code > rabbithole< / code > .< / p >
< p > This gives a Python REPL in which < code > hs< / code > gives access to the
< code > synapse.server.HomeServer< / code > object - which in turn gives access to many other
parts of the process.< / p >
< p > Note that, prior to Synapse 1.41, any call which returns a coroutine will need to be wrapped in < code > ensureDeferred< / code > .< / p >
< p > As a simple example, retrieving an event from the database:< / p >
< pre > < code class = "language-pycon" > > > > from twisted.internet import defer
> > > defer.ensureDeferred(hs.get_datastore().get_event('$1416420717069yeQaw:matrix.org'))
< Deferred at 0x7ff253fc6998 current result: < FrozenEvent event_id='$1416420717069yeQaw:matrix.org', type='m.room.create', state_key=''> >
< / code > < / pre >
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