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dCore Server & Networking

dCore Server Overview

dCore may be used as a basic, lightweight home server. A text only server would require <64mb RAM (~42mb) at boot. It can utilize an existing swap partition, if already present. Otherwise create either a swap file or partition as needed. Although a live boot requires only ~20mb drive space (CD, DVD, USB, hard drive), a frugal text only installation (persistent hard drive install) likely requires ~100-200mb drive space, even after installing desired server and networking extensions. The Tiny Core base system, dCore components and server tools can all be managed from command line, no need to install Xorg/graphics.

At a TTY/terminal or terminal emulator, entering 'busybox' or 'busybox –list' outputs all available BusyBox commands. Tab auto-completion is supported. Pressing the Tab key twice lists all current system executables. After loading exensions, these additional executables will also become available. In a TTY or non-scrolling terminal, use Shift-PageUp and PageDown keys to scroll. Running 'executable_name –help' (two dashes) provides basic help and usage information for most commands.

iptables

Basic dCore iptables setup guide for desktop use. Modify for special need, networking, server or preference. Many ways to accomplish this in dCore, iptables has numerous configuration options. Run iptables –help for usage information. This method was tested in dCore-jessie.

Numerous tutorials online, useful references:

The following rules are based on #7.1 - Only Block Incoming Traffic:

Designed to drop all incoming/forwarded packets, allow outgoing traffic.

With this basic configuration ping, wget and browsing all work.

Basic iptables setup:

Confirm kernel version:

  uname -r

Install iptables and netfilter onboot:

  sce-import -b iptables
  sce-import -b netfilter-<your_kernel_version>-tinycore

Load these extensions or reboot:

  sce-load iptables
  sce-load netfilter-<your_kernel_version>-tinycore

Check iptables status:

  sudo iptables -L -v

Lock down INPUT and FORWARD networking, disregard OUTPUT (user initiated traffic):

  sudo iptables --policy INPUT DROP
  sudo iptables --policy FORWARD DROP

Recheck status:

  sudo iptables -L -v

Attempt to access internet, ping domain, network (should fail, that's good!)

  ping -c3 www.google.com

Set up special rules, this allows INPUT for user initiated requests (eg. web browser):

  sudo iptables -A INPUT -m state --state NEW,ESTABLISHED -j ACCEPT

Save configuration state (only appeared to work in /home or /opt):

  sudo /sbin/iptables-save > /home/tc/iptables-rules

Append this line to /opt/bootlocal.sh so iptables-rules load at boot:

  /sbin/iptables-restore < /home/tc/iptables-rules

Backup for persistence:

  backup

Reboot system:

  sudo reboot

Verify iptables configuration persistence:

  sudo iptables -L -v

Repeat process as desired to modify rules

NTFS

For NTFS file system read-write capability utilize the ntfs-3g package.

By default NTFS partitions are mounted read-only (ro), example:

  tc@box:~$ cat /etc/fstab | grep sda1
  /dev/sda1       /mnt/sda1       ntfs     noauto,users,exec,ro,umask=000 0 0 # Added by TC

Prior to using ntfs-3g ensure no NTFS partitions are already mounted read-only, run and confirm:

  mount | grep sd

Unmount any NTFS partitions using a method below, first two commands may fail, /dev/sda1 example:

  sudo umount /dev/sda1
  sudo umount --force /dev/sda1  #if above fails, attempt forced umount
  sudo reboot                    #last resort to unmount NTFS partition(s)

Import ntfs-3g preferably to load at boot:

  sce-import -b ntfs-3g

Reboot or load:

  sce-load ntfs-3g

Mount desired NTFS partition using the ntfs-3g command, example:

  sudo ntfs-3g /dev/sda1 /mnt/sda1

The NTFS partition will now be accessible read-write as user 'tc'.

To unmount, reboot or use for example:

  sudo umount /dev/sda1
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