[oe] Making /var/lib persistent

[Koen Kooi]

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Jamie Lenehan schreef:
> On Tue, Apr 17, 2007 at 12:02:03AM +0200, Koen Kooi wrote:
>> Hi,
>>
>> Marcel Holtmann just pointed me to the fact that OE mount /var as tmpfs for
>> almost all machines, which wipes /var/lib at boot, which will break bluez and
>> dpkg.
>>
>> What would be the best way to preserve /var/lib (and maybe others) across boots?
> 
> This has been brought up a few times and no one has really had a good
> answer for it. I think /var/lib at a minimum needs to be made
> persistent.
> 
> After thinking about it a bit I've got the following proposal:
> 
>  - make /var a standard directory (no tmpfs)
> 
>  - make /var/volatile a tmpfs filesystems (or /var/tmpfs)
> 
>  - symlink things that are to be made volatile from /var into
>    /var/volatile
> 
> So the default /var would end up looking like this:
> 
>  /var/volatile       tmpfs mount
>  /var/volatile/lock  *
>  /var/volatile/run   *
>  /var/volatile/tmp   *
>  /var/volatile/cache *
>  /var/volatile/log   *
>  /var/backups
>  /var/lib
>  /var/lock           symlink to /var/volatile/lock
>  /var/run            symlink to /var/volatile/run
>  /var/tmp            symlink to /var/volatile/tmp
>  /var/cache          symlink to /var/volatile/cache
>  /var/local
>  /var/log            symlink to /var/volatile/log
>  /var/spool
>  /var/www
> 
> * == created by the existing volatiles system
> 
> (According to the FHS /var/tmp should also persist over reboots.)
> 
> This also has an advantage in the situation where I want to make
> something persistent I just have to break the symlink. So for the
> logs for example I could just have "rm /var/log && mv
> /var/volatile/log /var/log" and from then on the logs would remain.

Sound like a good idea, do you have a patch for this?

regards,

Koen


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