[yocto] Read-only rootfs, excluding /tmp and /var/logs

[ChenQi]

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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