openstack/ironic
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Document systemd-nspawn as a nice trick for patching a ramdisk

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Change-Id: I1f6d60a1db272293b701b44d705efc92933682a7
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Dmitry Tantsur 2019-10-17 11:18:10 +02:00
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doc/source/admin/troubleshooting.rst
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@ -173,6 +173,21 @@ The last command will result in the whole Linux file system tree unpacked in
the current directory. Now you can modify any files you want. The actual the current directory. Now you can modify any files you want. The actual
location of the files will depend on the way you've built the ramdisk. location of the files will depend on the way you've built the ramdisk.
.. note::
On a systemd-based system you can use the ``systemd-nspawn`` tool (from
the ``systemd-container`` package) to create a lightweight container from
the unpacked filesystem tree::
sudo systemd-nspawn --directory /path/to/unpacked/ramdisk/ /bin/bash
This will allow you to run commands within the filesystem, e.g. use package
manager. If the ramdisk is also systemd-based, and you have login
credentials set up, you can even boot a real ramdisk enviroment with
::
sudo systemd-nspawn --directory /path/to/unpacked/ramdisk/ --boot
After you've done the modifications, pack the whole content of the current After you've done the modifications, pack the whole content of the current
directory back:: directory back::