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@@ -130,3 +130,15 @@ docker run -it --rm \
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This will generate the same configuration file as the legacy mode used, but
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will store it in `/data/homeserver.yaml` instead of a temporary location. You
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can then use it as shown above at [Running synapse](#running-synapse).
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+
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+## Building the image
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+
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+If you need to build the image from a Synapse checkout, use the following `docker
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+ build` command from the repo's root:
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+
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+```
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+docker build -t matrixdotorg/synapse -f docker/Dockerfile .
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+```
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+
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+You can choose to build a different docker image by changing the value of the `-f` flag to
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+point to another Dockerfile.
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