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Improve S3 docs around data migration
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Slavi Pantaleev
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@ -6,6 +6,11 @@ If that's alright, you can skip this.
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If you'd like to store Synapse's content repository (`media_store`) files on Amazon S3 (or other S3-compatible service),
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you can let this playbook configure [Goofys](https://github.com/kahing/goofys) for you.
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Using a Goofys-backed media store works, but performance may not be ideal. If possible, try to use a region which is close to your Matrix server.
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If you'd like to move your locally-stored media store data to Amazon S3 (or another S3-compatible object store), we also provide some migration instructions below.
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## Amazon S3
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You'll need an Amazon S3 bucket and some IAM user credentials (access key + secret key) with full write access to the bucket. Example security policy:
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@ -50,3 +55,133 @@ matrix_s3_media_store_custom_endpoint_enabled: true
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# Example: "https://storage.googleapis.com"
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matrix_s3_media_store_custom_endpoint: "your-custom-endpoint"
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```
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### Backblaze B2
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To use [Backblaze B2](https://www.backblaze.com/b2/cloud-storage.html):
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- create a new **private** bucket through its user interface (you can call it something like `matrix-DOMAIN-media-store`)
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- note the **Endpoint** for your bucket (something like `s3.us-west-002.backblazeb2.com`)
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- adjust its lifecycle rules to use the following **custom** rules:
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- File Path: *empty value*
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- Days Till Hide: *empty value*
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- Days Till Delete: `1`
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- go to [App Keys](https://secure.backblaze.com/app_keys.htm) and use the **Add a New Application Key** to create a new one
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- restrict it to the previously created bucket (e.g. `matrix-DOMAIN-media-store`)
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- give it *Read & Write* access
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Copy the `keyID` and `applicationKey`.
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You need the following *additional* playbook configuration (on top of what you see above):
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```yaml
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matrix_s3_media_store_bucket_name: "YOUR_BUCKET_NAME_GOES_HERE"
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matrix_s3_media_store_aws_access_key: "YOUR_keyID_GOES_HERE"
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matrix_s3_media_store_aws_secret_key: "YOUR_applicationKey_GOES_HERE"
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matrix_s3_media_store_custom_endpoint_enabled: true
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matrix_s3_media_store_custom_endpoint: "https://s3.us-west-002.backblazeb2.com" # this may be different for your bucket
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```
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If you have local media store files and wish to migrate to Backblaze B2 subsequently, follow our [migration guide to Backblaze B2](#migrating-to-backblaze-b2) below instead of applying this configuration as-is.
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## Migrating from local filesystem storage to S3
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It's a good idea to [make a complete server backup](faq.md#how-do-i-backup-the-data-on-my-server) before migrating your local media store to an S3-backed one.
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Follow one of the guides below for a migration path from a locally-stored media store to one stored on S3-compatible storage:
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- [Migrating to any S3-compatible storage (universal, but likely slow)](#migrating-to-any-s3-compatible-storage-universal-but-likely-slow)
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- [Migrating to Backblaze B2](#migrating-to-backblaze-b2)
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### Migrating to any S3-compatible storage (universal, but likely slow)
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It's a good idea to [make a complete server backup](faq.md#how-do-i-backup-the-data-on-my-server) before doing this.
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1. Proceed with the steps below without stopping Matrix services
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2. Start by adding the base S3 configuration in your `vars.yml` file (seen above, may be different depending on the S3 provider of your choice)
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3. In addition to the base configuration you see above, add this to your `vars.yml` file:
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```yaml
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matrix_s3_media_store_path: /matrix/s3-media-store
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```
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This enables S3 support, but mounts the S3 storage bucket to `/matrix/s3-media-store` without hooking it to your homeserver yet. Your homeserver will still continue using your local filesystem for its media store.
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5. Run the playbook to apply the changes: `ansible-playbook -i inventory/hosts setup.yml --tags=setup-all,start`
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6. Do an **initial sync of your files** by running this **on the server** (it may take a very long time):
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```sh
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sudo -u matrix -- rsync --size-only --ignore-existing -avr /matrix/synapse/storage/media-store/. /matrix/s3-media-store/.
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```
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You may need to install `rsync` manually.
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7. Stop all Matrix services (`ansible-playbook -i inventory/hosts setup.yml --tags=stop`)
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8. Start the S3 service by running this **on the server**: `systemctl start matrix-goofys`
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9. Sync the files again by re-running the `rsync` command you see in step #6
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10. Stop the S3 service by running this **on the server**: `systemctl stop matrix-goofys`
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11. Get the old media store out of the way by running this command on the server:
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```sh
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mv /matrix/synapse/storage/media-store /matrix/synapse/storage/media-store-local-backup
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```
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12. Remove the `matrix_s3_media_store_path` configuration from your `vars.yml` file (undoing step #3 above)
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13. Run the playbook: `ansible-playbook -i inventory/hosts setup.yml --tags=setup-all,start`
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14. You're done! Verify that loading existing (old) media files works and that you can upload new ones.
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15. When confident that it all works, get rid of the local media store directory: `rm -rf /matrix/synapse/storage/media-store-local-backup`
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### Migrating to Backblaze B2
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It's a good idea to [make a complete server backup](faq.md#how-do-i-backup-the-data-on-my-server) before doing this.
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1. While all Matrix services are running, run the following command on the server:
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(you need to adjust the 3 `--env` line below with your own data)
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```sh
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docker run -it --rm -w /work \
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--env='B2_KEY_ID=YOUR_KEY_GOES_HERE' \
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--env='B2_KEY_SECRET=YOUR_SECRET_GOES_HERE' \
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--env='B2_BUCKET_NAME=YOUR_BUCKET_NAME_GOES_HERE' \
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-v /matrix/synapse/storage/media-store/:/work \
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--entrypoint=/bin/sh \
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docker.io/tianon/backblaze-b2:2.1.0 \
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-c 'b2 authorize-account $B2_KEY_ID $B2_KEY_SECRET > /dev/null && b2 sync /work/ b2://$B2_BUCKET_NAME'
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```
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This is some initial file sync, which may take a very long time.
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2. Stop all Matrix services (`ansible-playbook -i inventory/hosts setup.yml --tags=stop`)
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3. Run the command from step #1 again.
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Doing this will sync any new files that may have been created locally in the meantime.
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Now that Matrix services aren't running, we're sure to get Backblaze B2 and your local media store fully in sync.
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4. Get the old media store out of the way by running this command on the server:
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```sh
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mv /matrix/synapse/storage/media-store /matrix/synapse/storage/media-store-local-backup
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```
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5. Put the [Backblaze B2 settings seen above](#backblaze-b2) in your `vars.yml` file
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6. Run the playbook: `ansible-playbook -i inventory/hosts setup.yml --tags=setup-all,start`
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7. You're done! Verify that loading existing (old) media files works and that you can upload new ones.
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8. When confident that it all works, get rid of the local media store directory: `rm -rf /matrix/synapse/storage/media-store-local-backup`
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