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# `sys`
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> _Ex Machina_ (film)
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---
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| Name | Description | Skills | Done |
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| ------------- | ------------------------------------------------------------------------------------------------------------------ | ---------------------- | --------------- |
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| `linux` | Introduction and VirtualBox installation/basic usage. | OS, virtualization | subject + audit |
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| `login` | Connect to console (using different virtual terminals), basic commands and usage of the console. | OS | subject |
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| `add-vm` | Download and add our training virtual machines (introduction to snapshots). | virtualization | VM, subject |
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| `connect` | Fix a conflict of IP address, configure DHCP & static IP address. | OS, network | VM, subject |
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| `remote` | Remotely connect to a pseudo-terminal (configure firewall, change SSH port and listening address). | OS, network, security | VM, subject |
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| `scan` | Discover machines and services (scan ARP, `nmap`), brute-force portals. | OS, network, security | VM, subject |
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| `upgrade` | Free disk space (caches, logs & temporary files) to upgrade the OS. | OS | WIP |
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| `reboot` | Learn how to recognize a blocked system and reboot it (hard reset, magic SysRq key). | OS | |
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| `ram` | Fix a program being OOM (enlarge swap and system memory, compare performance). | OS, virtualization | |
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| `benchmark` | Learn how to benchmark a program | OS, disk | WIP |
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| `boot` | Fix the various boot stages of a broken system (including a misconfigured application). | OS, network | WIP |
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| `process` | Find processes by port, name, file, resource usage. Find their configuration file path. | OS | WIP |
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| `monitoring` | Monitor the system, by hand and with an application. | OS | WIP |
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| `network` | Build a network by hand, DNS, `arp`, `ip.` | network | |
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| `modem` | Configure a system as a router/firewall, making it similar to a residential gateway. | network | |
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| `censorship` | Bypass or mitigate various censorship methods (DNS, IP, DPI, MITM, shadowban, non-indexed content, deplatforming). | network, security | |
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| `virus` | Remove a stealth virus (multiple signatures and infection vectors). Reinstall safely. | OS | |
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| `data` | Data recovery, fix corrupted file system, obtain minimal disk image size. | OS, disk | |
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| `nas` | Make your own NAS with RAID, Samba, NFS, iSCSI, ClamAV | OS, network, disk | WIP |
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| `performance` | Boost the performance of a service tweaking scheduling CPU pinning, `[io]nice`, RAID 0, NIC bonding. | OS, CPU, network, disk | |
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| `sys` | (Bonus) Recreate `debian-01` virtual machine. | All of the above | WIP |
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