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32 .\" $DragonFly: src/share/man/man7/vkernel.7,v 1.4 2007/01/19 08:13:44 swildner Exp $
39 .Nd virtual kernel architecture
45 .Pa /usr/obj/usr/src/sys/VKERNEL/kernel.debug
47 .Op Fl e Ar name Ns = Ns Li value : Ns Ar name Ns = Ns Li value : Ns ...
49 .Op Fl I Ar interface Ns Op Ar :address1 Ns Oo Ar :address2 Oc Ns Oo Ar /netmask Oc
55 architecture allows for running
59 The following options are available:
60 .Bl -tag -width ".Fl m Ar size"
61 .It Fl e Ar name Ns = Ns Li value : Ns Ar name Ns = Ns Li value : Ns ...
62 Specify an environment to be used by the kernel.
64 .\"Specify a memory image
66 .\"to be used by the kernel.
67 .It Fl I Ar interface Ns Op Ar :address1 Ns Oo Ar :address2 Oc Ns Oo Ar /netmask Oc
68 Create a virtual network device, with the first
78 argument is the name of a
83 path prefix does not have to be specified and will be automatically prepended.
86 will pick the first unused
94 arguments are the IP addresses of the
105 interface is added to the specified
111 argument applies to all interfaces for which an address is specified.
113 Specify the amount of memory to be used by the kernel in bytes,
120 Lowercase versions of
126 Specify the root image
128 to be used by the kernel.
131 for further information on how to prepare a root image.
133 Boot into single-user mode.
135 Enable writing to kernel memory and module loading.
136 By default, those are disabled for security reasons.
138 Turn on verbose booting.
141 A couple of steps are necessary in order to prepare the system to build and
142 run a virtual kernel.
143 .Ss Setting up the filesystem
146 architecture needs a number of files which reside in
148 Since these files tend to get rather big and the
150 partition is usually of limited size, we recommend the directory to be
153 partition with a link to it in
156 mkdir /home/var.vkernel
157 ln -s /home/var.vkernel /var/vkernel
160 Next, a filesystem image to be used by the virtual kernel has to be
161 created and populated (assuming world has been built previously):
163 dd if=/dev/zero of=/var/vkernel/rootimg.01 bs=1m count=2048
164 vnconfig -c -s labels vn0 /var/vkernel/rootimg.01
165 disklabel -r -w vn0 auto
166 disklabel -e vn0 # edit the label to create a vn0a partition
170 make installworld DESTDIR=/mnt
172 make distribution DESTDIR=/mnt
173 echo '/dev/vkd0 / ufs rw 1 1' >/mnt/etc/fstab
174 echo 'console "/usr/libexec/getty Pc" cons25 on secure' >/mnt/etc/ttys
178 .Ss Compiling the virtual kernel
179 In order to compile a virtual kernel use the
181 kernel configuration file residing in
182 .Pa /usr/src/sys/config
183 (or a configuration file derived thereof):
186 make -DNO_MODULES buildkernel KERNCONF=VKERNEL
188 .Ss Enabling virtual kernel operation
191 .Va vm.vkernel_enable ,
192 must be set to enable
196 sysctl vm.vkernel_enable=1
198 .Ss Configuring the network on the host system
199 In order to access a network interface of the host system from the
201 you must add the interface to a
203 device which will then be passed to the
209 ifconfig bridge0 create
210 ifconfig bridge0 addm re0 # assuming re0 is the host's interface
213 .Ss Running the kernel
214 Finally, the virtual kernel can be run:
216 cd /usr/obj/usr/src/sys/VKERNEL
217 \&./kernel.debug -m 64m -r /var/vkernel/rootimg.01 -I auto:bridge0
222 command can be used to stop a virtual kernel.
232 Virtual kernels were introduced in
237 thought up and implemented the
240 This manual page was written by