Make Your Own Bootable Thumbdrive with Buildroot - Revision history

Jeff: /* Going Further */

Jeff — Sat, 07 Apr 2012 07:18:29 GMT

Going Further

←Older revision		Revision as of 07:18, 7 April 2012
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	but that's it.		but that's it.

-	If you made a module for your network card, <code>modprobe</code> it and run <code>udhcpc eth0</code>.	+	If you made a module for your network card, <code>modprobe</code> it and run <code>udhcpc eth0</code>. If you built <code>busybox</code> with <code>ping</code> you can test your network and if
-	If you built <code>busybox</code> with <code>ping</code> you can test your network and if	+
	you added <code>nc</code> you can probe some ports.		you added <code>nc</code> you can probe some ports.

Jeff at 06:23, 7 April 2012

Jeff — Sat, 07 Apr 2012 06:23:53 GMT

←Older revision		Revision as of 06:23, 7 April 2012
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	You may choose to change some options in any of these. Indeed, you		You may choose to change some options in any of these. Indeed, you
	probably want to add some drivers for some network cards to the		probably want to add some drivers for some network cards to the
-	kernel. The Intel e1000 is useful for running in <code>qemu<code> or <code>VirtualBox</code>.	+	kernel. The Intel e1000 is useful for running in <code>qemu</code> or <code>VirtualBox</code>.
	I didn't really need to alter uClibc beyond its defaults, but I turned		I didn't really need to alter uClibc beyond its defaults, but I turned
	on a few more applets in busybox and added bzip2 and xzip support.		on a few more applets in busybox and added bzip2 and xzip support.

Jeff at 23:57, 6 April 2012

Jeff — Fri, 06 Apr 2012 23:57:17 GMT

←Older revision		Revision as of 23:57, 6 April 2012
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	lot bigger than is necessary for these needs.		lot bigger than is necessary for these needs.

-	[[User:Jeff\|Jeff]]	+	----
		+	[[User:Jeff\|Jeff]] 23:57, 6 April 2012 (UTC)

Jeff at 23:56, 6 April 2012

Jeff — Fri, 06 Apr 2012 23:56:48 GMT

←Older revision		Revision as of 23:56, 6 April 2012
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	http://freecode.com/projects/minisnmpd as well because <code>net-snmp</code> is a		http://freecode.com/projects/minisnmpd as well because <code>net-snmp</code> is a
	lot bigger than is necessary for these needs.		lot bigger than is necessary for these needs.
		+
		+	[[User:Jeff\|Jeff]]

Jeff at 08:32, 5 April 2012

Jeff — Thu, 05 Apr 2012 08:32:20 GMT

←Older revision		Revision as of 08:32, 5 April 2012
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	but that's it.		but that's it.

-	If you made a module for your network card, <code>modprobe</code> it and run <code>udhcpc	+	If you made a module for your network card, <code>modprobe</code> it and run <code>udhcpc eth0</code>.
-	eth0</code>. If you built <code>busybox</code> with <code>ping</code> you can test your network and if	+	If you built <code>busybox</code> with <code>ping</code> you can test your network and if
	you added <code>nc</code> you can probe some ports.		you added <code>nc</code> you can probe some ports.

-	Get back into menuconfig and add some more packages under '''Package	+	Get back into menuconfig and add some more packages under
-	Selection For The Target'''. I made my initial thumbdrive into a general	+	'''Package Selection For The Target'''. I made my initial thumbdrive into a general
	purpose firewall. I added <code>ebtables</code>, <code>iptables</code>, <code>ipset</code>, <code>dropbear</code>, and		purpose firewall. I added <code>ebtables</code>, <code>iptables</code>, <code>ipset</code>, <code>dropbear</code>, and
	<code>dnsmasq</code>. These are enough to give me at least the functionality of		<code>dnsmasq</code>. These are enough to give me at least the functionality of

Jeff at 08:30, 5 April 2012

Jeff — Thu, 05 Apr 2012 08:30:37 GMT

←Older revision		Revision as of 08:30, 5 April 2012
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	Finally, you need to tell <code>grub</code> how to boot the kernel. Make the		Finally, you need to tell <code>grub</code> how to boot the kernel. Make the
-	following in </code>/mnt/boot/grub/menu.lst</code>:	+	following in <code>/mnt/boot/grub/menu.lst</code>:

	<pre>		<pre>

Jeff at 08:28, 5 April 2012

Jeff — Thu, 05 Apr 2012 08:28:13 GMT

←Older revision		Revision as of 08:28, 5 April 2012
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	point I tried to use <code>syslinux</code> but I could not successfully build it,		point I tried to use <code>syslinux</code> but I could not successfully build it,
	so if you get it working, let me know. Choose "exit" a few more times		so if you get it working, let me know. Choose "exit" a few more times
-	and get back to the shell and run <code>make<code> again.	+	and get back to the shell and run <code>make</code> again.

	== Building A Bootable Thumbdrive ==		== Building A Bootable Thumbdrive ==

Jeff at 08:26, 5 April 2012

Jeff — Thu, 05 Apr 2012 08:26:48 GMT

←Older revision		Revision as of 08:26, 5 April 2012
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	Inside your <code>output</code> or look-aside directory, there is a subdirectory		Inside your <code>output</code> or look-aside directory, there is a subdirectory
-	named <code>target<code>. This is just about everything that will be built into	+	named <code>target</code>. This is just about everything that will be built into
	your final image. You can customize anything in here now,		your final image. You can customize anything in here now,
	particularly files in <code>target/etc</code>. You probably want to fix up the		particularly files in <code>target/etc</code>. You probably want to fix up the

Jeff at 08:24, 5 April 2012

Jeff — Thu, 05 Apr 2012 08:24:29 GMT

←Older revision		Revision as of 08:24, 5 April 2012
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	for the target variant. You could now select a different processor		for the target variant. You could now select a different processor
	type. I am building on a quad-core processor, so under '''Build Options'''		type. I am building on a quad-core processor, so under '''Build Options'''
-	I set the "number of jobs to run simultaneously" to 5. Under '''Target	+	I set the "number of jobs to run simultaneously" to 5. Under '''Target Optimizations''', I turned on "enable large file support," "enable IPv6
-	Optimizations''', I turned on "enable large file support," "enable IPv6	+
	support," "enable RPC support," "enable WCHAR support," and "enable		support," "enable RPC support," "enable WCHAR support," and "enable
	C++ support." The latter will build a cross-compiling g++ as well as		C++ support." The latter will build a cross-compiling g++ as well as

Jeff at 08:23, 5 April 2012

Jeff — Thu, 05 Apr 2012 08:23:05 GMT

←Older revision		Revision as of 08:23, 5 April 2012
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	== Building A Bootable Thumbdrive ==		== Building A Bootable Thumbdrive ==

-	If all has gone well, you now have a rootfs.tar under output/images.	+	If all has gone well, you now have a <code>rootfs.tar</code> under <code>output/images</code>.
-	You also have rootfs.ext2 if you chose that option. You can loopback	+	You also have <code>rootfs.ext2</code> if you chose that option. You can loopback
	mount this and chroot to it if you like.		mount this and chroot to it if you like.

	We're going to set buildroot aside for a moment and prepare the		We're going to set buildroot aside for a moment and prepare the
-	thumbdrive. Insert it into a USB socket. Check /proc/partitions and	+	thumbdrive. Insert it into a USB socket. Check <code>/proc/partitions</code> and
-	see what new partitions exist. Mine came up as /dev/sdb. Do the	+	see what new partitions exist. Mine came up as <code>/dev/sdb</code>. Do the
	following as root.		following as root.

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	'w' to write the new partition table to the drive and exit fdisk.		'w' to write the new partition table to the drive and exit fdisk.
	Make a new filesystem on the drive, mount it, and unpack the		Make a new filesystem on the drive, mount it, and unpack the
-	rootfs.tar onto it.	+	<code>rootfs.tar</code> onto it.

	mkfs /dev/sdb1		mkfs /dev/sdb1
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	tar xvf $OUTPUT/images/rootfs.tar		tar xvf $OUTPUT/images/rootfs.tar

-	Next we will make sure to install the grub which is now on the	+	Next we will make sure to install the <code>grub</code> which is now on the
	thumbdrive onto the boot sector of the thumbdrive.		thumbdrive onto the boot sector of the thumbdrive.

-	grub --root-directory=/mnt /dev/sdb	+	grub-install --root-directory=/mnt /dev/sdb

-	You will probably need an initrd in order to boot properly. My distro	+	You will probably need an <code>initrd</code> in order to boot properly. My distro
-	uses dracut to produce this and I found it worked perfectly.	+	uses <code>dracut</code> to produce this and I found it worked perfectly.

	dracut -k /mnt/lib/modules /mnt/boot/initrd.img 3.2.6		dracut -k /mnt/lib/modules /mnt/boot/initrd.img 3.2.6

-	Finally, you need to tell grub how to boot the kernel. Make the	+	Finally, you need to tell <code>grub</code> how to boot the kernel. Make the
-	following in /mnt/boot/grub/menu.lst:	+	following in </code>/mnt/boot/grub/menu.lst</code>:

	<pre>		<pre>
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	Now that you have your first bootable thumbdrive and have booted it a		Now that you have your first bootable thumbdrive and have booted it a
	few times to make sure it works, you have probably noticed it is quite		few times to make sure it works, you have probably noticed it is quite
-	boring at this point. It has vi and an /etc/passwd file and not much	+	boring at this point. It has <code>vi</code> and an <code>/etc/passwd</code> file and not much
	else. You could probably use it as rescue media for another computer		else. You could probably use it as rescue media for another computer
	but that's it.		but that's it.

-	If you made a module for your network card, modprobe it and run udhcpc	+	If you made a module for your network card, <code>modprobe</code> it and run <code>udhcpc
-	eth0. If you built busybox with ping you can test your network and if	+	eth0</code>. If you built <code>busybox</code> with <code>ping</code> you can test your network and if
-	you added nc you can probe some ports.	+	you added <code>nc</code> you can probe some ports.

-	Get back into menuconfig and add some more packages under Package	+	Get back into menuconfig and add some more packages under '''Package
-	Selection For The Target. I made my initial thumbdrive into a general	+	Selection For The Target'''. I made my initial thumbdrive into a general
-	purpose firewall. I added ebtables, iptables, ipset, dropbear, and	+	purpose firewall. I added <code>ebtables</code>, <code>iptables</code>, <code>ipset</code>, <code>dropbear</code>, and
-	dnsmasq. These are enough to give me at least the functionality of	+	<code>dnsmasq</code>. These are enough to give me at least the functionality of
-	OpenWrt or others. I also added net-snmp and nfs-utils. Just run	+	OpenWrt or others. I also added <code>net-snmp</code> and <code>nfs-utils</code>. Just run
-	make after selecting the packages and unpack the tarball as above.	+	<code>make</code> after selecting the packages and unpack the tarball as above.
-	You will need to run dracut again if you added to your kernel but it	+	You will need to run <code>dracut</code> again if you added to your kernel but it
-	is not necessary to mess with grub any more.	+	is not necessary to mess with <code>grub</code> any more.

	== Adding A Custom Package ==		== Adding A Custom Package ==
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	Here's the most advanced thing I have done with this. I added a new		Here's the most advanced thing I have done with this. I added a new
	package to buildroot. In order to add more advanced features to my		package to buildroot. In order to add more advanced features to my
-	firewall, I added xtables-addons. Check out	+	firewall, I added <code>xtables-addons</code>. Check out
	http://xtables-addons.sf.net/ for more information about what this		http://xtables-addons.sf.net/ for more information about what this
-	does. In short, it's some extensions for iptables which add	+	does. In short, it's some extensions for <code>iptables</code> which add
	portknocking, tarpitting, and portscan detection to name a few.		portknocking, tarpitting, and portscan detection to name a few.

	Adding a package consists of just a few steps. First, I added the		Adding a package consists of just a few steps. First, I added the
-	xtables-addons subdirectory under my buildroot directory's package	+	<code>xtables-addons</code> subdirectory under my buildroot directory's <code>package</code>
	subdirectory. In this case it was		subdirectory. In this case it was
-	buildroot-2012.02/package/xtables-addons. You will see that all	+	<code>buildroot-2012.02/package/xtables-addons</code>. You will see that all
-	available packages have a subdirectory under package. Inside here, I	+	available packages have a subdirectory under <code>package</code>. Inside here, I
-	added Config.in with the following contents:	+	added <code>Config.in</code> with the following contents:

	<pre>		<pre>
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	Before "bool" and "help" that's one tab. The other two indented lines		Before "bool" and "help" that's one tab. The other two indented lines
	are one tab and two spaces. I think this is important. Second, I		are one tab and two spaces. I think this is important. Second, I
-	added another file to the same location, xtables-addons.mk with the	+	added another file to the same location, <code>xtables-addons.mk</code> with the
	following:		following:

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	</pre>		</pre>

-	And finally, I added a line to package/Config.in:	+	And finally, I added a line to <code>package/Config.in</code>:

	source "package/xl2tp/Config.in"		source "package/xl2tp/Config.in"
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	make xtables-addons		make xtables-addons

-	That will build the package and install it in output/target. When you	+	That will build the package and install it in <code>output/target</code>. When you
-	next run make, it will be added to your images. But when it is built	+	next run <code>make</code>, it will be added to your images. But when it is built
	initially, it fails because it tries to alter some files on your host		initially, it fails because it tries to alter some files on your host
	system, files which only root may change, which is why it is important		system, files which only root may change, which is why it is important
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	perhaps submit the package to the buildroot team as an addition.		perhaps submit the package to the buildroot team as an addition.

-	I also might add mini_snmpd from	+	I also might add <code>mini_snmpd</code> from
-	http://freecode.com/projects/minisnmpd as well because net-snmp is a	+	http://freecode.com/projects/minisnmpd as well because <code>net-snmp</code> is a
	lot bigger than is necessary for these needs.		lot bigger than is necessary for these needs.