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Containers from Scratch: Deep Dive into Container Networking

This page describes how to build and run containers from scratch, and configure container networking from scratch using the command line tools, chroot, unshare, ip and the Linux kernel feature, Namespaces. We will also demonstrate how to use them.

Before We Begin

Linux x86_64 Host
chroot ─ a user-space program to change the root filesystem of the calling process.
unshare ─ a user-space program to run a program in new namespace that isolates the process ID, mount, IPC, network, and so on.

Speeding Up C/C++ Builds Using Ccache

This page contains a guide on how to setup Ccache, Compiler Cache, and speed up the C/C++ compilation time using Ccache. And this guide will focus on the Linux x86_64 system.

Prerequisities

Linux x86_64 Host
Make
GCC (or) Clang/LLVM Compiler

Building a minimal Linux system from Scratch and Booting in QEMU Emulator

Prequisites

Make sure you installed the following tools on your Linux host.

Please, see the details information on Minimal requirements to install required build tools on your Linux host for compile the Busybox and Linux kernel.

Git
GCC or Clang Compiler
QEMU Emulator

	# This Android.mk is for compiling AudioWaveMaker Android app
	# for Android Make Build System.
	#
	LOCAL_PATH:= $(call my-dir)
	include $(CLEAR_VARS)

	LOCAL_RESOURCE_DIR := $(LOCAL_PATH)/res \
	frameworks/support/design/res \
	frameworks/support/v7/appcompat/res \
	frameworks/support/v17/leanback/res

	<!-- Networking and telephony -->
	<uses-permission android:name="android.permission.BLUETOOTH" />
	<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
	<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
	<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />
	<uses-permission android:name="android.permission.READ_PHONE_STATE" />
	<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
	<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
	<uses-permission android:name="android.permission.CONTROL_VPN" />

	# Inline Kernel Build
	KERNEL_TOOLCHAIN := $(ANDROID_BUILD_TOP)/prebuilts/gcc/$(HOST_OS)-x86/aarch64/aarch64-linux-android-4.9/bin
	KERNEL_TOOLCHAIN_PREFIX := aarch64-linux-android-
	TARGET_KERNEL_SOURCE := kernel/lge/bullhead
	TARGET_KERNEL_CONFIG := bullhead_defconfig
	BOARD_KERNEL_IMAGE_NAME := Image.gz-dtb

	# USEFUL TWRP RECOVERY FLAGS
	# by ZawZaw @XDA-Developers
	# Thanks to : @xda-developers for helps

	# Add EXT4 support
	TARGET_USERIMAGES_USE_EXT4 := true

	# Disable/enable SELinux. Only suggested when you want to enable SELinux support
	TWHAVE_SELINUX := true

	# Inline Kernel Build
	KERNEL_TOOLCHAIN := $(ANDROID_BUILD_TOP)/prebuilts/gcc/$(HOST_OS)-x86/aarch64/aarch64-linux-android-4.9/bin
	KERNEL_TOOLCHAIN_PREFIX := aarch64-linux-android-
	TARGET_KERNEL_SOURCE := kernel/moto/shamu
	TARGET_KERNEL_CONFIG := shamu_defconfig
	BOARD_KERNEL_IMAGE_NAME := Image.gz-dtb

	<?xml version="1.0" encoding="utf-8"?>
	<selector xmlns:android="http://schemas.android.com/apk/res/android">
	<item>
	<shape>
	<solid android:color="@android:color/white" />
	<corners android:radius="3dp" />
	<stroke android:width="2dp" android:color="@color/color_primary" />
	</shape>
	</item>
	</selector>

	<resources>
	<dimen name="margin_small">4dp</dimen>
	<dimen name="margin_medium">8dp</dimen>
	<dimen name="margin_medium_2">16dp</dimen>
	<dimen name="margin_medium_3">20dp</dimen>
	<dimen name="margin_large">24dp</dimen>
	<dimen name="margin_xlarge">32dp</dimen>
	<dimen name="margin_xxlarge">48dp</dimen>

	<dimen name="margin_card_medium">6dp</dimen>