[[remastering]]
Differences
This shows you the differences between two versions of the page.
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remastering [2017/10/03 17:17] zugschlus remaster light |
remastering [2018/08/06 14:56] (current) zugschlus document how to directly patch the ISO for serial operation |
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| This paragraph is a stub. If somebody knows how to do this "remaster light" process, please document here. If the grml project does not want "remaster light" to be documented, please remove the entire paragraph. | This paragraph is a stub. If somebody knows how to do this "remaster light" process, please document here. If the grml project does not want "remaster light" to be documented, please remove the entire paragraph. | ||
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| + | ===== Directly patching the .iso for isolinux configuration ===== | ||
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| + | [[https://github.com/grml/grml-live/pull/51|This merge request]] makes it much easier to do local, simple patches for the isolinux.cfg directly in the downloaded grml iso. This makes it, for example possible to create a grml .iso that is directly useable on a serial console. | ||
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| + | This merge request is not in grml 2017.05 but will likely be in the following grml release. Its validity has been verified with the daily snapshot on 2018-08-06. | ||
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| + | ==== Use case: iso that offers boot options on serial console ==== | ||
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| + | In some situations you want to boot up grml-small directly on a serial console without having to select "serial" on the graphical console first - for example in cases where the only access you have is a serial port (virtualization, housing). | ||
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| + | To do this, do: | ||
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| + | * download any grml-small iso later than 2018-08-06. The 2017.05 release will not do | ||
| + | * open the iso in a hex editor such as dhex or hte | ||
| + | * Be careful to only overwrite contents, not delete or insert. Moving the file contents will destroy the iso image. | ||
| + | * Search for the string a8bd612867ae71d0b17f9d33f80f61ab261aa354 or a shorter substring thereof. | ||
| + | * This will lead you to the live instance of the file [[https://github.com/grml/grml-live/blob/master/templates/boot/isolinux/isolinux.cfg|isolinux.cfg]] | ||
| + | * In this file, slightly above the hex marker string, replace the # sign in front of "serial 0 9600" so that the line now reads " serial 0 9600". Leaving the two spaces in prevents the rest of the image contents from being moved, they're ignored. | ||
| + | * Slightly lower than the hex marker string, replace "vesamenu.cfg" with " console.cfg", again noting the extra space to avoid movement of the image contents | ||
| + | * For more complex changes, there are 10 lines of 70 characters that you can arbitrarily replace. | ||
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| + | Booting this image directly displays a "boot:" prompt on both the serial and graphical consoles. <TAB> will give you the (long) list of available options. Typing "serial" will fire up a grml with the serial console as system console, giving you all boot output and finally a grml root shell on the serial console. | ||
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| ====== Remastering old Grml versions ====== | ====== Remastering old Grml versions ====== | ||
