Doc: maintenance document

.gitignore

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+scratch.txt

maintenance.md

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+# Maintenance
+
+## With caution
+
+- Remove duplicate `/gluetun` directory creation
+- Remove firewall shadowsocks input port?
+- Re-add `persist-tun`? Run openvpn without root?
+- Remove `script-security` option
+
+## Uniformization
+
+- Filter servers by protocol for all
+- Multiple IPs addresses support for all proviedrs
+
+## Code
+
+- Change empty string comparison from `len(s) == 0` to `s == ""`
+- Use `github.com/qdm12/ddns-updater/pkg/publicip`
+- Change firewall debug logs to use `logger.Debug` instead of `fmt.Println`
+
+## Features
+
+- Pprof server
+- Pre-install DNSSEC files so DoT can be activated even before the tunnel is up
+- Gluetun entire logs available at control server, maybe in structured format
+- Authentication with the control server
+
+## Gluetun V4
+
+- Remove retro environment variables
+- Updater servers version reset to 1
+- Change models to all have IPs instead of IP
+- Remove HTTP server v0
+- `PORT` to `OPENVPN_PORT`
+- `UNBLOCK` to `DOT_UNBOUND_UNBLOCK`
+- `PROTOCOL` to `OPENVPN_PROTOCOL`
+- `PORT_FORWARDING`
+- Change servers filtering environment variables to plural