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added anki sync server instructions
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docs/anki_sync_server.md
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# Anki Sync Server
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With the new versions of Anki, `anki` now provides an integrated sync-server feature, allowing for up-to-date scheduler versions as long as anki on the server is also updated regularly.
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Other implementations such as [Anki Sync Server](https://github.com/dsnopek/anki-sync-server) might be less resource intensive but need to be updated separately to allow for newer scheduler versions.
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This requires quite a bit of memory, but a lot if it is shared. If you run anything else using python (very likely), running this sync server in addition should maybe an additional 100-200M.
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## Installation
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Install anki: `paru -S anki`
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We're assuming here that you are running the latest Anki on your server, however you manage to do that (some distros are quite conservative with their anki versions). On Arch, I currently maintain the `anki` and `anki-qt5` packages in the AUR so they should be up-to-date.
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## Reverse Proxy using nginx
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Anki creates a sync server locally on 0.0.0.0:8080. We want to put this behind a reverse proxy for convenience.
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Create a new `server{}` section in your nginx setup. Recommended is a new file in `/etc/nginx/sites-available`
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```/etc/nginx/sites-available/anki_sync_server
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server{
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server_name anki.<yourdomain.tld>;
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listen 80;
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client_max_body_size 500M;
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location / {
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proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
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proxy_set_header Host $host;
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proxy_pass http://0.0.0.0:8080;
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proxy_buffering off;
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proxy_http_version 1.1;
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proxy_set_header Upgrade $http_upgrade;
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proxy_set_header Connection "upgrade";
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}
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}
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```
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Some of these settings are a bit overkill for anki, but are good defaults for modern web applications behind a reverse proxy.
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Check whether the syntax is good via `nginx -t` and if so, restart nginx `systemctl restart nginx`.
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This is still unencrypted. Using certbot you can now deploy certificates
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```sh
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certbot --nginx -d anki.<yourdomain.tld>
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```
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If everything goes good you should be able to verify in `/etc/nginx/sites-available/anki_sync_server`.
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## Create a user and service
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Personally, I see this sync data as a kind of database and would like to store it in `/var/lib` because of this.
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For security we should start anki as a separate user with write permissions confined to `/var/lib/anki`.
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Create a user:
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```sh
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useradd -b /var/lib/ -s /usr/bin/nologin anki
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mkdir /var/lib/anki
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chown -R /var/lib/anki anki:anki
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```
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Using systemd, create a service file: `/etc/systemd/system/anki_sync_server.service`:
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```systemd
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[Unit]
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Description=Personal Anki Sync Server
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After=network.target
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[Service]
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ExecStart=anki --syncserver
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Restart=always
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User=anki
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Group=anki
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Environment=SYNC_USER1=<name1>:<password1>
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Environment=SYNC_USER2=<name2>:<password2>
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[Install]
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WantedBy=multi-user.target
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```
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You can create additional users using the `SYNC_USER<i>` environment variables. This stores the passwords in plain text on the machine so is less than optimal.
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TODO: can we somehow store these env vars securely?
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You should now be able to start your sync server via `systemctl start anki_sync_server.service`.
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If everything looks good in the journal, you can `sytemctl renable anki_sync_server`.
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## Connecting from your Client
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### Desktop
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1. Go to: `Tools -> Preferences -> Syncing`
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2. Logout
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3. set "Self-hosted-sync-server" to `https://anki.<yourdomain.tld>`
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5. Restart anki
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6. Click on `Sync` and login using your `<name1>` and `<password1>` which you set in the service file.
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## Ankidroid
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1. Go to: `Settings -> Advanced -> Custom sync server`
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2. Set both the sync url and the media sync url to `https://anki.<yourdomain.tld>`
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3. Click on the sync icon in the main top-bar. Login using your `<name1>` and `<password1>` you set in the service file.
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`
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1
index.md
1
index.md
@ -23,6 +23,7 @@ Happy to accept pull requests for new topics!
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- [ssh](docs/ssh.md) ssh configuration
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- [git](docs/GIT.md) version control software
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- [rainloop](docs/rainloop.md) webbased email client
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- [anki sync server](anki_sync_server.md) personal sync server for anki, a spaced repetition learning program
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# Admin
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