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soc:2009:pravin:journal:ubuntubko [2009/07/17 05:35] less1 |
soc:2009:pravin:journal:ubuntubko [2009/07/27 05:26] (current) less1 |
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| which says that | which says that | ||
| <code> | <code> | ||
| - | When switching another root device, initrd would pivot_root and then umount the ramdisk. But initramfs is rootfs: you shouldn't pivot_root rootfs and can't unmount it. Just delete everything out of it (except the new block device node, if any), overmount /, and exec the new init. (The klibc package contains a helper program in utils/run_init.c to do this for you, and other packages have adopted this as switch_root.) | + | When switching another root device, initrd would pivot_root and then umount the ramdisk. But initramfs is rootfs: |
| + | you shouldn't pivot_root rootfs and can't unmount it. Just delete everything out of it (except the new block device node, if any), | ||
| + | overmount /, and exec the new init. (The klibc package contains a helper program in utils/run_init.c to do this for you, | ||
| + | and other packages have adopted this as switch_root.) | ||
| </code> | </code> | ||
| Now, I don't know for sure, which files are not getting deleated and hence causing problem. | Now, I don't know for sure, which files are not getting deleated and hence causing problem. | ||
| + | |||
| + | ==== A question ==== | ||
| + | what is the differnece between debian script and ubuntu script that filesystem.squashfs is not working with ubuntu, but it works with debian? | ||
| + | |||
| + | - comparing ''d/scripts/live'' with ''u/scripts/casper'' --- too different, diff went crazy with this command. They are as good as seperate program who do similar work. | ||
| + | - comparing ''d/bin/run-init'' with ''u/bin/run-init'', --- they are same. | ||
| + | - comparing ''d/init'' with ''u/init'' -- not much of difference | ||
| + | |||
| + | This approach is not working for me, I will try another approach. | ||
| + | |||
| + | ==== analyzing run_init.c ==== | ||
| + | My guess is that, run_init.c is the one who is dying, and it seems he does allow you to specify the files which should not be deleted. | ||
| + | I want to see how to tell that to run_init.c | ||
| + | - Another thing that I want to try out is, what if I dont delete the contents of initramfs? I will remove that check from run_init.c will system still boot? | ||
| + | - My guess is that, ''overmount /'' may fail. | ||
| + | - Now, I need to locate the source code of run_init.c | ||
| + | |||
| + | ===== Ubuntu over iscsi ===== | ||
| + | - Following the line of [[BKODebianISCSI|Debian over iscsi]], attempted the Ubuntu over iscsi, but it did not worked. | ||
| + | |||
| + | |||
| + | ===== Problem found ===== | ||
| + | - From the progress in fedora, it seems that problem is because network is restarting itself, which kills the the network and mounted HTTPFS. Culprits are | ||
| + | - ''/etc/init.d/network'' | ||
| + | - ''/etc/init.d/NetworkManager'' | ||
| + | |||
| + | ===== Solution ===== | ||
| + | The temporary hack implemented is **Delete these two files** before doing ''run-init''. This hack works fine in this case, only problem is that the ''/etc/resolver.conf'' | ||
| + | entry remains empty so dns resolving does not work. Need to fix this soon. | ||
