Read-only rootfs, excluding /tmp and /var/logs

Read-only rootfs, excluding /tmp and /var/logs

[Andrew Wozniak]

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Greetings,

I'm fairly new to the Yocto environment but have worked with lower level
Linux build systems. To get started, my target needs to have a read-only
rootfs, while excluding specific directories like /tmp and /var/logs...

The Project Dev Manual 5.15 section mentions the configuration of a
read-only filesystem. I haven't tried this method yet and was wondering if
there are any options for custom exclusions other than the /tmp and
/var/run mentioned in the docs.

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Re: Read-only rootfs, excluding /tmp and /var/logs

[Anders Darander]

* Andrew Wozniak <drew.woz@gmail.com> [141028 15:05]:
> I'm fairly new to the Yocto environment but have worked with lower
> level Linux build systems. To get started, my target needs to have a
> read-only rootfs, while excluding specific directories like /tmp and
> /var/logs...

> The Project Dev Manual 5.15 section mentions the configuration of a
> read-only filesystem. I haven't tried this method yet and was
> wondering if there are any options for custom exclusions other than
> the /tmp and /var/run mentioned in the docs.

If you're working on the lates release, check out the volatile-binds
recipe in oe-core. 

Otherwise, check out https://github.com/MentorEmbedded/meta-ro-rootfs,
which is were volatile-binds originates from.

Cheers,
Anders

-- 
Anders Darander
ChargeStorm AB / eStorm AB

Re: Read-only rootfs, excluding /tmp and /var/logs

[ChenQi]

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On 10/28/2014 09:47 PM, Andrew Wozniak wrote:
> Greetings,
>
> I'm fairly new to the Yocto environment but have worked with lower 
> level Linux build systems. To get started, my target needs to have a 
> read-only rootfs, while excluding specific directories like /tmp and 
> /var/logs...
>
> The Project Dev Manual 5.15 section mentions the configuration of a 
> read-only filesystem. I haven't tried this method yet and was 
> wondering if there are any options for custom exclusions other than 
> the /tmp and /var/run mentioned in the docs.
>
>

I think you are using a sysvinit based system, right?

With the current project, you can follow the two steps below o make 
things work:
1. Modify meta/recipes-core/initscripts/initscripts-1.0/volatiles file, 
remove the corresponding entries for /tmp and /var/log.
You can do this via a bbappend file in your own layer, or you could just 
modified the installed file (/etc/default/volatiles/00_core).

2. Edit your /etc/fstab, add corresponding entries.

I think this is an area we should do better in Yocto.

Best Regards,
Chen Qi


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