# server-scripts

Useful scripts for managing servers written in Bash. Supported OS includes only Ubuntu/Debian and Alpine.

In the past I was using it more for maintaining my home servers, bare metal with Docker, however when I changed to k3s, I started using it less. Now I'm using this as a collection of useful scripts that I can use when needed. Also `clean.sh` is still useful.

### `clean.sh`

This script is used to clean some of the files, docker dangling images, and docker stopped/unused containers.

### `windows-backup.ps1`

This PowerShell script is used to backup files from a Windows machine to a remote Samba server. It uses `7zip` to create the zip file, and then sends over the network using SMB protocol.

### `dns-override.sh`

Aggressive, best-effort DNS override script for Linux hosts with support for multiple resolver stacks (`systemd-resolved`, `NetworkManager`, `resolvconf/openresolv`, `dhclient`, `systemd-networkd`, and `ifupdown`) plus direct `/etc/resolv.conf` writes.

It prompts for:
- 2 required DNS servers
- 1 optional third DNS server

Validation/features:
- Accepts IPv4 and IPv6 literals
- Rejects invalid or duplicate entries
- Performs reachability checks (warn-only, does not block execution)
- Can optionally lock `/etc/resolv.conf` with `chattr +i`

Run with `curl | bash`:

```bash
curl -sSL https://git.ivanch.me/ivanch/server-scripts/raw/branch/main/dns-override.sh | bash
```

Important notes:
- Requires interactive TTY input (prompts are read from `/dev/tty`)
- Requires root privileges (`sudo` is used/re-execed when possible)
- Script is intentionally aggressive and may restart/reload network services
- On heavily managed systems (custom agents, immutable images, enterprise policy), behavior is still best-effort

## Haven Notify

It's a small internal service designed to send notifications to a specified Discord channel via webhooks. It's written in Go and can be easily deployed.

The project is defined on [/haven-notify](./haven-notify) folder.