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On 12/11/2009 08:00 PM, Dale wrote: |
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> Alan McKinnon wrote: |
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>> On Friday 11 December 2009 17:07:17 Dale wrote: |
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>> |
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>>> Alan McKinnon wrote: |
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>>> |
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>>>> On Friday 11 December 2009 15:16:01 Dale wrote: |
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>>>> |
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>>>>> Rebooting will also do all of this but it is not needed. From a |
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>>>>> technical stand point, the only time you must reboot is to load a new |
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>>>>> kernel. |
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>>>>> |
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>>>> And these days, not even then :-) |
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>>>> |
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>>>> [it requires some voodoo but is certainly possible] |
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>>>> |
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>>>> [[and I don't mean build and install a new kernel, I really do mean loa |
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>>>> ti into memory and run it, dispensing with the old one]] |
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>>>> |
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>>> I have read about that but never read something from someone who has |
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>>> actually done it. I have always been curious as to how that would work, |
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>>> in reality not just theory. |
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>>> |
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>> |
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>> kexec and CONFIG_RELOCATABLE |
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>> |
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>> |
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>>> I have also wondered why a person would go to all that trouble. |
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>>> Wouldn't all the services have to be restarted anyway? |
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>>> |
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>> |
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>> Nope. userspace ABI is stable so services just carry on as normal once |
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>> he new kernel comes up. You don't need to restart SeaMonkey if you |
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>> restart a local apache on your machine - same thing |
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>> |
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>> |
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> |
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> That would be cool of you had a system that just couldn't be rebooted. |
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> Is there such a thing tho? What would be the reason a machine just |
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> could not be rebooted? I guess one would be if the puter was on planet |
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> Mars maybe? Is that how NASA does it? lol Could you imagine getting a |
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> blue screen of death on a computer that is on Mars? O_O |
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> |
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> Dale |
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> |
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> :-) :-) |
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A real world scenario would be a bank server doing transactions. Those |
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big irons do never ever get shut down. |
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(But they also don't ever get really updated ;) |
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|
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Did you know, that they still use cobol-code from decades ago. The code |
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has to interact with newer systems, but the existing code is not allowed |
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to be altered, they just run it inside hugh java application servers on |
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their main frames :D |
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|
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Bye, |
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Daniel |
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|
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-- |
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use PGP key @ http://pgpkeys.pca.dfn.de/pks/lookup?search=0xBB9D4887&op=get |
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# gpg --recv-keys --keyserver hkp://subkeys.pgp.net 0xBB9D4887 |
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