Use deploy.replicas and variable in proxy_pass in improve-public-instance.md (#469)

`Scale` can be replaced with `deploy.replicas` within the compose file.

https://github.com/docker/compose/issues/5586#issuecomment-972130556

Using a variable in proxy_pass forces re-resolution of the DNS names. (In my tests, this helps solving some network quirks)

https://forum.nginx.org/read.php?2,215830,215832#msg-215832
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@ -42,12 +42,16 @@ We assume that you have not changed the port `3000` from the default installatio
```
This is required so that only one invidious process refresh the subscriptions for the users.
Running this process with multiple processes may introduce some conflicts.
4. Create a new bash script that you will now use to start Invidious, name it `start.sh`:
4. Edit the docker-compose.yml with this content:
```
#!/bin/sh
docker compose up -d --scale invidious=6
version: "3"
services:
invidious:
image: quay.io/invidious/invidious:latest
deploy:
replicas: 6
```
Explanation: The `--scale` parameter allows running multiple containers of the same Docker image.
Explanation: The `deploy.replicas` parameter allows running multiple containers of the same Docker image.
Note: You can set more or less Invidious processes (6 in the example).
**Don't restart Invidious yet!**
5. Create a file called `nginx.conf` and add this content:
@ -62,7 +66,9 @@ We assume that you have not changed the port `3000` from the default installatio
listen [::]:3000;
access_log off;
location / {
proxy_pass http://invidious:3000;
resolver 127.0.0.11;
set $backend "invidious";
proxy_pass http://$backend:3000;
proxy_http_version 1.1; # to keep alive
proxy_set_header Connection ""; # to keep alive
}
@ -96,8 +102,7 @@ We assume that you have not changed the port `3000` from the default installatio
8. Apply the new configuration:
```
docker compose down
chmod +x ./start.sh
./start.sh
docker compose up
```
??? note "Click here for a final example of the `docker-compose` file. (Don't copy blindly)"
@ -107,6 +112,8 @@ We assume that you have not changed the port `3000` from the default installatio
services:
invidious:
image: quay.io/invidious/invidious:latest
deploy:
replicas: 6
restart: unless-stopped
environment:
INVIDIOUS_CONFIG: |
@ -254,7 +261,7 @@ But if you do not have NGINX as **your main reverse proxy** you can either try t
volumes:
- /opt/http3-ytproxy:/opt/http3-ytproxy
```
5. Reload the docker composition: `./start.sh` (if you followed the [second section](#2-multiple-invidious-processes))
5. Reload the docker compose. (if you followed the [second section](#2-multiple-invidious-processes))
6. Reload NGINX: `systemctl reload nginx`.
??? note "Click here for a final example of the `docker-compose` file. (Don't copy blindly)"
@ -264,6 +271,8 @@ But if you do not have NGINX as **your main reverse proxy** you can either try t
services:
invidious:
image: quay.io/invidious/invidious:latest
deploy:
replicas: 6
restart: unless-stopped
environment:
INVIDIOUS_CONFIG: |