72 lines
2.1 KiB
Text
72 lines
2.1 KiB
Text
= Fedora Infrastructure Kpartx Notes
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== How to mount virtual partitions
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There can be multiple reasons you need to work with the contents of a
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virtual machine without that machine running.
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[arabic]
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. {blank}
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+
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You have decommisioned the system and found you need to get something::
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that was not backed up.
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. {blank}
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+
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The system is for some reason unbootable and you need to change some::
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file to make it work.
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. Forensics work of some sort.
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In the case of 1 and 2 the following commands and tools are invaluable.
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In the case of 3, you should work with the Fedora Security Team and
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follow their instructions completely.
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== Steps to Work With Virtual System
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[arabic]
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. Find out what physical server the virtual machine image is on.
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+
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____
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[upperalpha]
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.. Log into batcave01.phx2.fedoraproject.org
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.. search for the hostname in the file /var/log/virthost-lists.out:
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+
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....
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$ grep proxy01.phx2.fedoraproject.org /var/log/virthost-lists.out
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virthost05.phx2.fedoraproject.org:proxy01.phx2.fedoraproject.org:running:1
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....
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.. If the image does not show up in the list then most likely it is an
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image which has been decommissioned. You will need to search the virtual
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hosts more directly:
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+
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....
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# for i in `awk -F: '{print $1}' /var/log/virthost-lists.out |
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sort -u`; do
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ansible $i -m shell -a 'lvs | grep proxy01.phx2'
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done
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....
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____
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. Log into the virtual server and make sure the image is shutdown. Even
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in cases where the system is not working correctly it may have still
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have a running qemu on the physical server. It is best to confirm that
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the box is dead.
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+
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____
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# virsh destroy <hostname>
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____
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. We will be using the kpartx command to make the guest image ready for
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mounting.
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+
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____
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# lvs | grep <hostname> # kpartx -l /dev/mapper/<volume>-<hostname> #
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kpartx -a /dev/mapper/<volume>-<hostname> # vgscan # vgchange -ay
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/dev/mapper/<new volume-name> # mount /dev/mapper/<partition we want>
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/mnt
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____
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. Edit the files as needed.
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. Tear down the tree.
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+
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____
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# umount /mnt::
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# vgchange -an <volume-name> # vgscan # kpartx -d
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/dev/mapper/<volume>-<hostname>
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____
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