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1<?xml version='1.0'?> 1<?xml version='1.0' encoding="UTF-8"?>
2<?xml-stylesheet href="/xsl/guide.xsl" type="text/xsl"?> 2<!-- $Header: /var/cvsroot/gentoo/xml/htdocs/doc/en/uml.xml,v 1.20 2004/10/07 17:20:22 swift Exp $ -->
3 3
4<!DOCTYPE guide SYSTEM "/dtd/guide.dtd"> 4<!DOCTYPE guide SYSTEM "/dtd/guide.dtd">
5 5
6<guide link="/doc/uml.html"> 6<guide link="/doc/en/uml.xml">
7<title>Gentoo Linux Developer's guide to system testing with User-Mode Linux</title> 7<title>Gentoo Linux Developer's guide to system testing with User-Mode Linux</title>
8<author title="Editor">
8<author title="Editor"><mail link="g2boojum@gentoo.org">Grant Goodyear</mail></author> 9 <mail link="g2boojum@gentoo.org">Grant Goodyear</mail>
10</author>
11<author title="Editor"><!-- zhen@gentoo.org -->
12 John Davis
13</author>
14<author title="Editor">
15 <mail link="swift@gentoo.org">Sven Vermeulen</mail>
16</author>
17<author title="Editor">
18 <mail link="bennyc@gentoo.org">Benny Chuang</mail>
19</author>
9 20
10<abstract> 21<abstract>
11 This guide shows Gentoo Linux developers how to set up and use 22This guide shows Gentoo Linux developers how to set up and use
12 user-mode linux for testing potentially system-breaking changes. 23user-mode linux for testing potentially system-breaking changes.
13</abstract> 24</abstract>
14 25
26<license/>
27
15<version>0.05</version> 28<version>0.9</version>
16<date>5 Mar 2002</date> 29<date>October 07, 2004</date>
17 30
18<chapter> 31<chapter>
19<title>Obtaining User-Mode Linux</title> 32<title>Obtaining User-Mode Linux</title>
20<section> 33<section>
21<body> 34<body>
35
36<p>
22<p>As the user-mode linux website 37As the user-mode linux website
23(<uri>http://user-mode-linux.sourceforge.net</uri>) 38(<uri>http://user-mode-linux.sourceforge.net</uri>) states, user-mode linux
24states, user-mode linux
25allows a user to "run Linux inside itself". Specifically, 39allows a user to "run Linux inside itself". Specifically,
26user-mode linux provides a virtual machine on which a user can "[r]un buggy 40user-mode linux provides a virtual machine on which a user can "[r]un buggy
27software, experiment with new Linux kernels or distributions, and poke around 41software, experiment with new Linux kernels or distributions, and poke around
28in the internals of Linux, all without risking your main Linux setup." Changes 42in the internals of Linux, all without risking your main Linux setup." Changes
29to Gentoo core packages such as <e>sys-apps/baselayout</e> or <e>sys-libs/glibc</e> 43to Gentoo core packages such as <e>sys-apps/baselayout</e> or
30have the potential to break the system and render it unbootable; with user-mode 44<e>sys-libs/glibc</e> have the potential to break the system and render it
31linux we can test these changes without having to worry about breaking the live 45unbootable; with user-mode linux we can test these changes without having to
32system. 46worry about breaking the live system.
33</p> 47</p>
48
34<p> 49<p>
35Installing user-mode linux is essentially identical to a normal kernel 50Installing user-mode linux is essentially identical to a normal kernel
36install. First install the kernel sources (appropriately patched for 51install. First install the kernel sources (appropriately patched for
37user-mode linux), and then configure the user-mode linux kernel in the 52user-mode linux), and then configure the user-mode linux kernel in the
38usual fashion: 53usual fashion:
39</p> 54</p>
40<pre> 55
56<pre caption="Installing UML kernel sources">
41# <i>emerge sys-kernel/usermode-sources</i> 57# <i>emerge sys-kernel/usermode-sources</i>
42# <i>cd /usr/src/uml/linux</i> 58# <i>cd /usr/src/uml/linux</i>
43# <i>make menuconfig <comment>ARCH=um</comment></i> 59# <i>make menuconfig <comment>ARCH=um</comment></i>
44# <i>make linux <comment>ARCH=um</comment></i> 60# <i>make linux <comment>ARCH=um</comment></i>
45# <i>cp linux /usr/local/bin/linux</i> 61# <i>cp linux /usr/local/bin/linux</i>
46</pre> 62</pre>
63
64<warn>
47<warn>The <e>ARCH=um</e> fragment is <e>extremely</e> important!</warn> 65The <e>ARCH=um</e> fragment is <e>extremely</e> important!
48<impo> 66</warn>
67
68<p>
69Make sure that <path>/usr/local/bin</path> is in your path. Edit
70<path>/etc/env.d/00basic</path> to that the PATH variable contains
71<path>/usr/local/bin</path> and rerun <c>env-update</c>:
72</p>
73
74<pre caption="Editing 00basic">
75# <i>nano -w /etc/env.d/00basic</i>
76# <i>env-update</i>
77# <i>source /etc/profile</i>
78</pre>
79
80<p>
49For the user-mode linux kernel to properly boot a Gentoo system the 81For the user-mode linux kernel to properly boot a Gentoo system the
50kernel needs to be configured to <e>not</e> automatically mount 82kernel needs to be configured to <e>not</e> automatically mount
51<path>/dev</path> (devfs) by default. 83<path>/dev</path> (devfs) by default. Also, you will almost certainly
52Also, you will almost certainly
53want to make sure that you have <e>tmpfs</e> (the "Virtual Memory 84want to make sure that you have <e>tmpfs</e> (the "Virtual Memory
54Filesystem") compiled in, since by default the Gentoo linux bootscripts 85Filesystem") compiled in, since by default the Gentoo linux bootscripts
55store their information in a small tmpfs partition. 86store their information in a small tmpfs partition.
56(The binary kernels available 87(The binary kernels available from the user-mode website do automatically
57from the user-mode website do automatically mount <path>/dev</path>, 88mount <path>/dev</path>, and they don't have tmpfs compiled in; don't bother
58and they don't have tmpfs compiled in; don't bother with them.) 89with them).
59</impo> 90</p>
91
92<p>
60<p>I highly recommend reading the user-mode linux documentation, but the 93I highly recommend reading the user-mode linux documentation, but the
61basic idea is that running the <path>/usr/local/bin/linux</path> program 94basic idea is that running the <path>/usr/local/bin/linux</path> program
62boots the user-mode kernel and tries to bring up the system stored in 95boots the user-mode kernel and tries to bring up the system stored in
63the file <path>root_fs</path> that should be located in the current working 96the file <path>root_fs</path> that should be located in the current working
64directory.</p> 97directory.
98</p>
99
100<p>
65<p>It won't hurt to also install the user-mode linux tools.</p> 101It won't hurt to also install the user-mode linux tools.
66<pre> 102</p>
103
104<pre caption="Installing UML tools">
67# <i>emerge sys-apps/usermode-utilities</i> 105# <i>emerge sys-apps/usermode-utilities</i>
68</pre> 106</pre>
107
108<p>
69<p>These tools facilitate networking (among other things) 109These tools facilitate networking (among other things) between the user-mode
70between the user-mode linux virtual system 110linux virtual system and the host Linux system.
71and the host Linux system.</p> 111</p>
112
72</body> 113</body>
73</section> 114</section>
74</chapter> 115</chapter>
75 116
76<chapter> 117<chapter>
77<title>Creating <path>root_fs</path></title> 118<title>Creating root_fs</title>
78
79<section> 119<section>
80<title>Making the Gentoo chroot</title> 120<title>Making the Gentoo chroot</title>
81<body> 121<body>
122
82<p> 123<p>
83The <path>root_fs</path> file needed for user-mode linux is 124The <path>root_fs</path> file needed for user-mode linux is
84a single file that contains an entire Gentoo Linux filesystem. 125a single file that contains an entire Gentoo Linux filesystem.
85To generate this file you will need to have Loopback device 126To generate this file you will need to have Loopback device
86support enabled in the host (non-user-mode) kernel. 127support enabled in the host (non-user-mode) kernel.
87</p> 128</p>
129
130<p>
88<p>Generating the <path>root_fs</path> file itself will be 131Generating the <path>root_fs</path> file itself will be
89our last step. First we will generate a Gentoo filesystem in 132our last step. First we will generate a Gentoo filesystem in
90an ordinary chroot. We need the build tarball available, which 133an ordinary chroot. We need the stage tarball available, which
91could be downloaded separately, extracted from a build cd, or 134could be downloaded separately, extracted from a liveCD, or
92extracted from a build .iso. 135extracted from a liveCD .iso.
93</p> 136</p>
137
94<pre caption="Mounting a build .iso"> 138<pre caption="Mounting a liveCD .iso">
95# <i>mkdir /mnt/loop</i> 139# <i>mkdir /mnt/loop</i>
96# <i>mount -o loop /path/to/build-&lt;TAB&gt;.iso /mnt/loop</i> 140# <i>mount -o loop /path/to/install-&lt;TAB&gt;.iso /mnt/loop</i>
97</pre> 141</pre>
142
98<p> 143<p>
99Setting up the chroot is essentially identical to an ordinary Gentoo 144Setting up the chroot is essentially identical to an ordinary Gentoo
100Linux build. 145Linux build.
101</p> 146</p>
102<pre> 147
148<pre caption="Creating the Gentoo chroot mount">
103# <i>mkdir /mnt/gentoo</i> 149# <i>mkdir /mnt/gentoo</i>
104# <i>cd /mnt/gentoo</i> 150# <i>cd /mnt/gentoo</i>
105# <i>tar xvjpf /path/to/build-&lt;TAB&gt;.tar.bz2</i> 151# <i>tar xvjpf /path/to/stage&lt;TAB&gt;.tar.bz2</i>
106</pre> 152</pre>
153
107<p> 154<p>
108Go ahead and unmount the .iso. You don't need it anymore. 155Go ahead and unmount the .iso. You don't need it anymore.
109</p> 156</p>
110<pre> 157
111# <i>cp /etc/resolv.conf /mnt/gentoo/etc/</i>
112# <i>mount -o bind /proc /mnt/gentoo/proc</i>
113# <i>mkdir -p /mnt/gentoo/usr/portage/distfiles</i>
114# <i>mkdir -p /mnt/gentoo/usr/portage/packages</i>
115# <i>mount -o bind /usr/portage/distfiles /mnt/gentoo/usr/portage/distfiles</i>
116# <i>mount -o bind /usr/portage/packages /mnt/gentoo/usr/portage/packages</i>
117# <i>chroot /mnt/gentoo /bin/bash</i>
118# <i>env-update</i>
119# <i>source /etc/profile</i>
120</pre>
121<p>
122By bind-mounting <path>/usr/portage/distfiles</path> and
123<path>/usr/portage/packages</path> we avoid having to download
124or build packages that are already present on the Gentoo host.
125</p> 158<p>
159Bootstrap and build the system in the usual fashion. Just follow the
160installation instructions :)
126<p> 161</p>
127Bootstrap and build the system in the usual fashion: 162
128</p>
129<pre>
130# <i>emerge rsync</i>
131# <i>cd /usr/portage</i>
132# <i>nano -w /etc/make.conf</i>
133# <i>nano -w /etc/make.profile/packages</i>
134# <i>nano -w /usr/portage/profiles/package.mask</i>
135# <i>scripts/bootstrap.sh &amp;&amp; emerge --usepkg system</i>
136</pre>
137<warn>
138The <path>/etc/make.profile/packages</path> file needs to be
139edited to remove grub from the default system (just remove the "*"
140from the beginning of the "*sys-apps/grub" line). The grub ebuild
141tries to mount the /boot partition, which will fail in our chroot.
142</warn>
143<note>
144Make sure you examine <path>/etc/make.profile/packages</path>
145and <path>/usr/portage/profiles/package.mask</path> to be sure that
146any to-be-tested packages that you want to install aren't masked out.
147As currently written, <path>scripts/bootstrap.sh</path> will compile
148the bootstrap packages from source. To use already-existing packages,
149add <c>alias emerge="emerge --usepkg"</c> somewhere near the top of
150the bootstrap script.
151</note>
152<p> 163<p>
153Add any additional packages you desire. Feel free to give your virtual 164Add any additional packages you desire. Feel free to give your virtual
154Gentoo system a hostname, if you so desire. In <path>/etc/fstab</path> 165Gentoo system a hostname, if you so desire. In <path>/etc/fstab</path>
155you will want <path>/dev/ROOT</path> to be <path>/dev/ubd/0</path>, with 166you will want <path>/dev/ROOT</path> to be <path>/dev/ubd/0</path>, with
156a fs type of either ext2, ext3, or reiserfs. Set <path>/dev/SWAP</path> 167a fs type of either ext2, ext3, or reiserfs. Set <path>/dev/SWAP</path>
157to be <path>/dev/ubd/1</path>, and comment out <path>/dev/BOOT</path>. 168to be <path>/dev/ubd/1</path>, and comment out <path>/dev/BOOT</path>.
158</p> 169</p>
170
171<p>
172At this point, remember to set your root password.
173</p>
174
175<pre caption="Setting root password">
176# <i>passwd</i>
177</pre>
178
179<p>
180Now we need to make some changes to the boot scripts. Remove consolefonts and
181keymaps from the boot runlevel:
182</p>
183
184<pre caption="Removing unneeded initscripts">
185# <i>rc-update del consolefonts boot</i>
186# <i>rc-update del keymaps boot</i>
187</pre>
188
159<p> 189<p>
160Exit the chroot, unmount all of the bind mounts, 190Exit the chroot, unmount all of the bind mounts,
161tar up the new Gentoo distro, and clean up: 191tar up the new Gentoo distro, and clean up.
162</p> 192</p>
163<pre> 193
164# <i>exit</i> 194<pre caption="Finalising the installation">
165# <i>umount /mnt/gentoo/usr/portage/distfiles</i>
166# <i>umount /mnt/gentoo/usr/portage/packages</i>
167# <i>umount /mnt/gentoo/proc</i>
168# <i>du -ks /mnt/gentoo</i> 195# <i>cd /mnt/gentoo</i>
169261744 /mnt/gentoo
170# <i>tar cvjpf ~/gentoo.tbz2 *</i> 196# <i>tar cvjpf ~/gentoo.tbz2 *</i>
171# <i>cd</i> 197# <i>cd</i>
172# <i>rm -rf /mnt/gentoo</i> 198# <i>rm -rf /mnt/gentoo</i>
173</pre> 199</pre>
174</body>
175</section>
176 200
201</body>
177<section> 202</section>
203<section>
178<title>Making <path>root_fs</path></title> 204<title>Making root_fs</title>
179<body> 205<body>
206
180<p> 207<p>
181Our Gentoo chroot is nearly 300 MB in size, so 208Our Gentoo chroot is nearly 300 MB in size, so
182<path>root_fs</path> needs to be at least that size. 209<path>root_fs</path> needs to be at least that size.
183We'll choose 0.5 GB as a reasonable size. 210We'll choose 0.5 GB as a reasonable size.
184</p> 211</p>
185<pre> 212
213<pre caption="Creating UML files">
186# <i>dd if=/dev/zero of=root_fs seek=500 count=1 bs=1M</i> 214# <i>dd if=/dev/zero of=root_fs seek=500 count=1 bs=1M</i>
187# <i>mke2fs -F root_fs</i> 215# <i>mke2fs -F root_fs</i>
188# <i>mount -o loop root_fs /mnt/loop</i> 216# <i>mount -o loop root_fs /mnt/loop</i>
189# <i>tar xvjpf gentoo.tbz2 -C /mnt/loop</i> 217# <i>tar xvjpf gentoo.tbz2 -C /mnt/loop</i>
190# <i>umount /mnt/loop</i> 218# <i>umount /mnt/loop</i>
191</pre> 219</pre>
220
192<p> 221<p>
193It would also be nice to have a 0.5 GB swap partition. 222It would also be nice to have a 0.5 GB swap partition.
194</p> 223</p>
195<pre> 224
225<pre caption="Create swap partition">
196# <i>dd if=/dev/zero of=swap_fs seek=500 count=1 bs=1M</i> 226# <i>dd if=/dev/zero of=swap_fs seek=500 count=1 bs=1M</i>
197# <i>mkswap -f swap_fs</i> 227# <i>mkswap -f swap_fs</i>
198</pre> 228</pre>
229
199<p> 230<p>
200Now see if it works! 231Now see if it works!
201</p> 232</p>
202<pre> 233
234<pre caption="Start UML kernel thread">
203# <i>linux ubd0=root_fs ubd1=swap_fs</i> 235# <i>linux ubd0=root_fs ubd1=swap_fs</i>
204</pre> 236</pre>
205<note> 237
238<p>
206User-mode linux uses xterms for the virtual consoles that 239User-mode linux uses xterms for the virtual consoles that
207are run at boot time, so you need to make sure that the 240are run at boot time, so you need to make sure that the
208terminal from which you run user-mode linux has $DISPLAY 241terminal from which you run user-mode linux has $DISPLAY
209properly set (along with proper xhost/xauth permissions). 242properly set (along with proper xhost/xauth permissions).
210</note> 243</p>
244
211<p> 245<p>
212With any luck you should be able to log into your user-mode linux 246With any luck you should be able to log into your user-mode linux
213Gentoo system. The only thing keeping this user-mode linux version 247Gentoo system. The only thing keeping this user-mode linux version
214of Gentoo from being fully functional is networking from the virtual 248of Gentoo from being fully functional is networking from the virtual
215machine to the host. Such networking is supposed to be trivial, 249machine to the host.
216but I have yet to get it to work for me. Should you find a workable
217solution, please let me know!
218</p> 250</p>
251
219</body> 252</body>
220</section> 253</section>
221</chapter> 254</chapter>
222 255
223<chapter> 256<chapter>
224<title>Networking</title> 257<title>Networking</title>
225
226<section> 258<section>
227<body> 259<body>
228<p> 260
229Thanks to Martin Schlemmer (Azarah), I now know how
230to get networking to function from within a user-mode
231system. The idea is that we set up a private network
232consisting of the user-mode system and the host system,
233and then the user-mode system routes all of its packets
234to the host, which then forwards packets to the net.
235Make sure that the host kernel has
236Networking --> IP: Netfilter Configuration --> IP tables support
237--> Full NAT --> MASQUERADE target support and
238Network Device Support --> Ethertap network tap
239compiled as modules; then do the following on the
240<e>host</e> machine:
241</p> 261<p>
262Make sure that the host kernel has the following settings compiled as modules:
263</p>
264
265<pre caption="Host kernel configuration">
266Networking --&gt;
267 IP: Netfilter Configuration --&gt;
268 IP tables support --&gt;
269 Full NAT --&gt;
270 &lt;M&gt; MASQUERADE target support
271
272 Network Device Support --&gt;
273 &lt;M&gt; TUN/TAP Support
242<pre> 274</pre>
275
276<p>
277Run the following commands on the <e>host</e> machine:
278</p>
279
280<pre caption="Setup networking">
243# <i>modprobe ethertap</i> 281# <i>modprobe tun</i>
282<comment>(If you receive a FATAL error here, try deleting /dev/net/tun and retry)</comment>
244# <i>modprobe iptable_nat</i> 283# <i>modprobe iptable_nat</i>
245# <i>iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE</i> 284# <i>iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE</i>
246# <i>echo 1 > /proc/sys/net/ipv4/ip_forward</i> 285# <i>echo 1 > /proc/sys/net/ipv4/ip_forward</i>
247</pre> 286</pre>
287
248<p> 288<p>
249The iptables line sets up IP Masquerading between the private 289The iptables line sets up IP Masquerading between the private
250network that our user-mode system will be on and the internet 290network that our user-mode system will be on and the internet
251(reachable via <c>eth0</c> in our case). The echo line then 291(reachable via <c>eth0</c> in our case). The echo line then
252turns on packet forwarding between the private network and the 292turns on packet forwarding between the private network and the
253interface that the default gateway is on (eth0 for us). 293interface that the default gateway is on (eth0 for us).
254</p> 294</p>
295
255<p> 296<p>
256Now we bring up the user-mode system and see if networking 297Now we bring up the user-mode system and see if networking
257is functional. 298is functional.
258</p> 299</p>
259<pre> 300
301<pre caption="Get UML up and running">
260# <i>linux ubd0=root_fs ubd1=swap_fs eth0=ethertap,tap0,,192.168.0.254</i> 302# <i>linux ubd0=root_fs ubd1=swap_fs eth0=tuntap,,,192.168.0.254</i>
261<comment>(login to user-mode system)</comment> 303<comment>(login to user-mode system)</comment>
262# <i>ifconfig eth0 192.168.0.1 up</i> 304# <i>ifconfig eth0 192.168.0.1 up</i>
263# <i>ping -c 2 192.168.0.254</i> 305# <i>ping -c 2 192.168.0.254</i>
264PING 192.168.0.254 (192.168.0.254): 56 octets data 306PING 192.168.0.254 (192.168.0.254): 56 octets data
26564 octets from 192.168.0.254: icmp_seq=0 ttl=255 time=0.8 ms 30764 octets from 192.168.0.254: icmp_seq=0 ttl=255 time=0.8 ms
26664 octets from 192.168.0.254: icmp_seq=1 ttl=255 time=0.6 ms 30864 octets from 192.168.0.254: icmp_seq=1 ttl=255 time=0.6 ms
267 309
268--- 192.168.0.254 ping statistics --- 310--- 192.168.0.254 ping statistics ---
2692 packets transmitted, 2 packets received, 0% packet loss 3112 packets transmitted, 2 packets received, 0% packet loss
270round-trip min/avg/max = 0.6/0.7/0.8 ms 312round-trip min/avg/max = 0.6/0.7/0.8 ms
271<i>route add default gw 192.168.0.254</i> 313# <i>route add default gw 192.168.0.254</i>
272<i>netstat -rn</i> 314# <i>netstat -rn</i>
273Kernel IP routing table 315Kernel IP routing table
274Destination Gateway Genmask Flags MSS Window irtt Iface 316Destination Gateway Genmask Flags MSS Window irtt Iface
275192.168.0.0 0.0.0.0 255.255.255.0 U 40 0 0 eth0 317192.168.0.0 0.0.0.0 255.255.255.0 U 40 0 0 eth0
2760.0.0.0 192.168.0.254 0.0.0.0 UG 40 0 0 eth0 3180.0.0.0 192.168.0.254 0.0.0.0 UG 40 0 0 eth0
277<i>scp user@192.168.0.254:/etc/resolv.conf /etc/resolv.conf</i> <comment>(if needed)</comment> 319# <i>scp user@192.168.0.254:/etc/resolv.conf /etc/resolv.conf</i> <comment>(if needed)</comment>
278<i>ping -c 2 www.gentoo.org</i> 320# <i>ping -c 2 www.gentoo.org</i>
279PING www.gentoo.org (207.170.82.202): 56 octets data 321PING www.gentoo.org (207.170.82.202): 56 octets data
28064 octets from 207.170.82.202: icmp_seq=0 ttl=240 time=119.6 ms 32264 octets from 207.170.82.202: icmp_seq=0 ttl=240 time=119.6 ms
28164 octets from 207.170.82.202: icmp_seq=1 ttl=240 time=92.0 ms 32364 octets from 207.170.82.202: icmp_seq=1 ttl=240 time=92.0 ms
282 324
283--- www.gentoo.org ping statistics --- 325--- www.gentoo.org ping statistics ---
2842 packets transmitted, 2 packets received, 0% packet loss 3262 packets transmitted, 2 packets received, 0% packet loss
285round-trip min/avg/max = 92.0/105.8/119.6 ms 327round-trip min/avg/max = 92.0/105.8/119.6 ms
286</pre> 328</pre>
329
287<p> 330<p>
288On the user-mode system we assign the user-mode eth0 interface 331On the user-mode system we assign the user-mode eth0 interface
289the private IP address 192.168.0.1 and bring up the interface. The 332the private IP address 192.168.0.1 and bring up the interface. The
290host has private IP address 192.168.0.254, and we ping it to make sure 333host has private IP address 192.168.0.254, and we ping it to make sure
291that our networking is, indeed, up. The route line adds a default 334that our networking is, indeed, up. The route line adds a default
293<path>/etc/resolv.conf</path> (if necessary), and we ping www.gentoo.org 336<path>/etc/resolv.conf</path> (if necessary), and we ping www.gentoo.org
294to make sure that name resolution (and general access to the internet) 337to make sure that name resolution (and general access to the internet)
295is working from our user-mode system. Now the user-mode system can 338is working from our user-mode system. Now the user-mode system can
296<c>emerge</c> at will! 339<c>emerge</c> at will!
297</p> 340</p>
341
298</body> 342</body>
299</section> 343</section>
300</chapter> 344</chapter>
301
302<chapter> 345<chapter>
303<title>Testing the .iso</title> 346<title>Testing the .iso</title>
304
305<section> 347<section>
306<body> 348<body>
349
307<p> 350<p>
308Perhaps the true ideal of Gentoo Linux testing would be 351Perhaps the true ideal of Gentoo Linux testing would be
309to boot the .iso with user-mode linux and do the complete 352to boot the .iso with user-mode linux and do the complete
310Gentoo install from within the user-mode linux virtual system. 353Gentoo install from within the user-mode linux virtual system.
311</p> 354</p>
355
312<p> 356<p>
313Booting the .iso, or actually the initrd from the .iso, is pretty 357Booting the .iso, or actually the initrd from the .iso, is pretty
314straightforward. 358straightforward.
315</p> 359</p>
316<pre> 360
361<pre caption="Booting the ISO">
317# <i>mount -o loop /path/to/build-&lt;TAB&gt;.iso /mnt/loop</i> 362# <i>mount -o loop /path/to/install-&lt;TAB&gt;.iso /mnt/loop</i>
318# <i>cp /mnt/loop/isolinux/rescue.gz .</i> 363# <i>cp /mnt/loop/isolinux/gentoo.igz .</i>
319# <i>linux load_ramdisk=1 prompt_ramdisk=0 ramdisk_size=22000 \</i> 364# <i>linux load_ramdisk=1 prompt_ramdisk=0 ramdisk_size=22000 \</i>
320&gt; <i>initrd=rescue.gz root=/dev/ram0 ubd0=root_fs ubd1=swap_fs \</i> 365&gt; <i>initrd=rescue.gz root=/dev/ram0 ubd0=root_fs ubd1=swap_fs \</i>
321&gt; <i>ubd2=/dev/cdroms/cdrom0 eth0=ethertap,tap0,,192.168.0.254</i> 366&gt; <i>ubd2=/dev/cdroms/cdrom0 eth0=tuntap,,,192.168.0.254</i>
322</pre> 367</pre>
368
369<p>
323<p>Now you can follow the Gentoo install doc essentially verbatim, 370Now you can follow the Gentoo install doc essentially verbatim,
324although you'll need to know that the root filesystem will be 371although you'll need to know that the root filesystem will be
325<path>/dev/ubd/0</path>, the swap "partition" 372<path>/dev/ubd/0</path>, the swap "partition"
326will be <path>/dev/ubd/1</path>, and the CD rom 373will be <path>/dev/ubd/1</path>, and the CD rom
327will be <path>/dev/ubd/2</path>.</p> 374will be <path>/dev/ubd/2</path>.
375</p>
376
328</body> 377</body>
329</section> 378</section>
330</chapter> 379</chapter>
331 380
381<chapter>
382<title>Resources</title>
383<section>
384<body>
385
386<ul>
387 <li>
388 <uri link="http://edeca.net/articles/bridging/index.html">Bridging with
389 UML</uri>
390 </li>
391 <li>
392 <uri link="http://user-mode-linux.sourceforge.net/">UML Homepage</uri>
393 </li>
394 <li>
395 <uri link="http://www.theshore.net/~caker/uml/">Caker's UML Notes</uri>
396 </li>
397 <li>
398 <uri link="http://sourceforge.net/mailarchive/forum.php?forum_id=3647">UML
399 Mailinglist archives</uri>
400 </li>
401</ul>
402
403</body>
404</section>
405</chapter>
332 406
333</guide> 407</guide>

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