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111 13.9 You can network to the host but not to other machines on the net
189 2. You can run a usermode kernel as a non-root user.
191 3. You can debug the User Mode Linux like any normal process.
193 4. You can run gprof (profiling) and gcov (coverage testing).
195 5. You can play with your kernel without breaking things.
197 6. You can use it as a sandbox for testing new apps.
199 7. You can try new development kernels safely.
201 8. You can run different distributions simultaneously.
305 which has directions on getting the sources. You can also browse the
309 empty directory. You will then have to copy each file into the
339 You can install them by using ftp or something to copy them into the
342 You can also get the kernel build process to install them as follows:
436 mount the file `root_fs' in the current directory. You do not need to
442 You will need a filesystem to boot UML from. There are a number
586 You can attach them to host ptys, ttys, file descriptors, and ports.
640 log. You access it by attaching a terminal program to the
705 You access these devices by telnetting to that port. Each active tel-
764 You can also specify different input and output channels for a device
813 You can attach two virtual machines together with what amounts to a
969 devices. You can also give the UMLs non-routable IPs (192.168.x.x or
976 You are not talking to the UML when you ping that interface and get a
980 You can also add devices to a UML and remove them at runtime. See the
1000 You will likely need the setuid helper, or the switch daemon, or both.
1030 o You aren't going to use the device for IP networking, so you don't
1066 You should be able to ping the host at this point.
1241 TUN/TAP device on the host. You can use a different one, but it won't
1517 setup - uml_net will do it for you. You just need to make sure you
1540 You also need to make sure that the host kernel has ethertap support.
1636 You can leave off everything except the 'daemon'. You only need to
1639 how to communicate with the daemon. You should only specify them if
1677 of. You should only specify one slip device on a given virtual
2007 You may want to create and mount new UML filesystems, either because
2168 You need to change the filesystem type of / in etc/fstab to be
2254 You need the mconsole client (uml_mconsole) which is present in CVS
2259 You also need CONFIG_MCONSOLE (under 'General Setup') enabled in UML.
2301 You'll get a prompt, at which you can run one of these commands:
2440 s', so that everything is written to the filesystem. You can then copy
2490 You can have the kernel running under the control of gdb from the
2491 beginning by putting 'debug' on the command line. You will get an
2511 shouldn't be. You need to figure out which process that is, which is
2586 o With ps, get the pid of the gdb that ddd started. You can ask the
2617 Using that support is somewhat complicated. You have to tell gdb what
2621 when you load the module again (i.e. after an rmmod). You have to
2642 You change that to list the names and paths of the modules that you
2820 and repeat the process above. You'll also need to re-enable break-
2886 An example of an alternate debugger is strace. You can strace the
3875 you have a buggy gcc. You can work around the problem by removing
3924 13.9. You can network to the host but not to other machines on the
3968 firewalling somewhere between the UML and the other box. You track
4138 pid. You can figure out the tracing thread pid by looking at the
4236 You can tell that it's the idle thread if the stack looks like this: