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Merge pull request #915 from leesalminen/fly-io-docs

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Add docs for hosting LNBits on Fly.io (for free)
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@ -95,6 +95,80 @@ mkdir data
docker run --detach --publish 5000:5000 --name lnbits-legend --volume ${PWD}/.env:/app/.env --volume ${PWD}/data/:/app/data lnbits-legend
```
## Option 5: Fly.io
Fly.io is a docker container hosting platform that has a generous free tier. You can host LNBits for free on Fly.io for personal use.
First, sign up for an account at [Fly.io](https://fly.io) (no credit card required).
Then, install the Fly.io CLI onto your device [here](https://fly.io/docs/getting-started/installing-flyctl/).
After install is complete, the command will output a command you should copy/paste/run to get `fly` into your `$PATH`. Something like:
```
flyctl was installed successfully to /home/ubuntu/.fly/bin/flyctl
Manually add the directory to your $HOME/.bash_profile (or similar)
export FLYCTL_INSTALL="/home/ubuntu/.fly"
export PATH="$FLYCTL_INSTALL/bin:$PATH"
```
You can either run those commands, then `source ~/.bash_profile` or, if you don't, you'll have to call Fly from `~/.fly/bin/flyctl`.
Once installed, run the following commands.
```
git clone https://github.com/lnbits/lnbits-legend.git
cd lnbits-legend
fly auth login
[complete login process]
fly launch
```
You'll be prompted to enter an app name, region, postgres (choose no), deploy now (choose no).
You'll now find a file in the directory called `fly.toml`. Open that file and modify/add the following settings.
Note: Be sure to replace `${PUT_YOUR_LNBITS_ENV_VARS_HERE}` with all relevant environment variables in `.env` or `.env.example`. Environment variable strings should be quoted here, so if in `.env` you have `LNBITS_ENDPOINT=https://legend.lnbits.com` in `fly.toml` you should have `LNBITS_ENDPOINT="https://legend.lnbits.com"`.
Note: Don't enter secret environment variables here. Fly.io offers secrets (via the `fly secrets` command) that are exposed as environment variables in your runtime. So, for example, if using the LND_REST funding source, you can run `fly secrets set LND_REST_MACAROON=<hex_macaroon_data>`.
```
...
kill_timeout = 30
...
...
[mounts]
source="lnbits_data"
destination="/data"
...
...
[env]
HOST="127.0.0.1"
PORT=5000
LNBITS_FORCE_HTTPS=true
LNBITS_DATA_FOLDER="/data"
${PUT_YOUR_LNBITS_ENV_VARS_HERE}
...
...
[[services]]
internal_port = 5000
...
```
Next, create a volume to store the sqlite database for LNBits. Be sure to choose the same region for the volume that you chose earlier.
```
fly volumes create lnbits_data --size 1
```
You're ready to deploy! Run `fly deploy` and follow the steps to finish deployment. You'll select a `region` (up to you, choose the same as you did for the storage volume previously created), `postgres` (choose no), `deploy` (choose yes).
You can use `fly logs` to view the application logs, or `fly ssh console` to get a ssh shell in the running container.
### Troubleshooting
Problems installing? These commands have helped us install LNbits.