Hi Mogens, there are a number of threads on this if you search the misc archives on marc.info,
but setting softdep,noatime mount options on /etc/fstab is advisable for routers I tend to use mfs for partitions that tend to get written to alot the following entries (/etc/fstab) show How I use mfs on my routers... swap /tmp mfs rw,nosuid,noexec,nodev,-s=512000,-P=/directorythatcontainsfilesthatwillbecopiedtomemoryatbootup/tmp 0 0 swap /var mfs rw,nosuid,noexec,nodev,-s=1024000,-P=/ directorythatcontainsfilesthatwillbecopiedtomemoryatbootup/var 0 0 swap /dev mfs rw,nosuid,noexec,-P=/ directorythatcontainsfilesthatwillbecopiedtomemoryatbootup/dev,-i=2048,-s=102400 0 0 but bear in mind that that uses up to 1.6GB of ram ... so you might want to tweak. to what suits your needs... check out conway's resflash and cappucios flashrd also https://www.packetmischief.ca/openbsd-compact-flash-firewall/ I hope this helps Tom Smyth On Tue, 4 Jun 2019 at 20:31, Mogens Jensen <mogens-jen...@protonmail.com> wrote: > I'm going to build a router for use in a remote location, and I have > chosen OpenBSD 6.5 for the task. Unfortunately, it's not possible to > protect the router with an UPS, so it will have to be resilient enough > to survive sudden power outages and still boot without manual > intervention. > > In the past I have built a few Linux based routers and they were > configured to run from RAM. I have made some research to see if this is > also possible on OpenBSD and found that, while there are solutions to > have / read-only, none of this is officially supported. > > Can anyone with experience running OpenBSD routers without UPS, tell if > filesystem corruption is going to be a problem after power outages, or > if there are any officially supported ways to make the system resilient > enough to not break after a power outage? > > I'm using an mSATA disk with MLC flash in the router. > > Thanks in advance. > > Mogens Jensen > -- Kindest regards, Tom Smyth.
