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References: <ec02b6cfb338b5b2ca3242ecfd73ff9228e42129.camel@linuxfoundation.org>
 <12063.1631766857327604520@lists.yoctoproject.org>
In-Reply-To: <12063.1631766857327604520@lists.yoctoproject.org>
From: "Khem Raj" <raj.khem@gmail.com>
Date: Wed, 15 Sep 2021 21:50:43 -0700
Message-ID: <CAMKF1srGFp_t5aZOh=Hd_479JiqFY6=g4pwoXbmhLf+O2M_UYQ@mail.gmail.com>
Subject: Re: [yocto] Sharing sstate cache across build nodes
To: Rusty Howell <rustyhowell@gmail.com>
Cc: Yocto-mailing-list <yocto@lists.yoctoproject.org>
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On Wed, Sep 15, 2021 at 9:34 PM Rusty Howell <rustyhowell@gmail.com> wrote:
>
> Thanks for the replies, Richard.
>
> Can SSTATE_DIR be shared across build hosts with different OS's  (Ubuntu =
18.04, ubuntu 20.04, etc, RHEL)?

yes if you use uninative ( which is default in poky) then it should be
able to share across multiple build hosts.

>
> Our build hosts are somewhat ephemeral.  Occasionally we need to swap out=
 a build host for another one. So to bring on a new fresh build host and ha=
ve it cooperate correctly with the other build hosts and the PR server, wha=
t does it need?  I understand having the NFS mounted SSTATE_DIR, and using =
the PRSERV_HOST variable set correctly. But what else?  Does the new build =
host need access to a shared PERSISTENT_DIR or a shared BUILDHISTORY_DIR?
>
> What happens if the shared SSTATE cache get corrupted and has to be delet=
ed?   Won't that cause all the PR server values to reset?  We just want to =
make sure we know how to recover from a situation like that.

if you preserve PR server data then you should be good. sstate can be
regenerated.

> Thanks a bunch.
> Rusty
>=20
>