On 2021-03-20, mm0fmf  wrote:
> I've used Pi's since as soon as I could buy them but I've never run one
> 24/7 before so I'd like to ensure I've done sufficient to maximise SD
> Card life.
>
> All this PI does is sit accepting SSH connections and acts as a gateway
> to allow tunnelling or SOCKS5 proxying.  It also lets me send WOL magic
> packets to other local computers to wake them up so I don't need to
> leave those computers running 24/7. That's all working fine.
>
> However, I'd like to maximise the SC Card life where possible so I have
> mounted a few places onto tmpfs to minimise writes to the card. I have a
> couple of cron jobs running that tickle the dynamic DNS provider and
> another that reboots the Pi every 24 hours as a crude and simple way of
> ensuring not the tmpfs log space doesn't fill.
>
> The following are mounted onto tmpfs:
>
> tmpfs on /tmp type tmpfs (rw,nosuid,noatime,size=102400k)
> tmpfs on /var/spool/mqueue type tmpfs
> (rw,nosuid,noatime,size=30720k,mode=700,gid=12)
> tmpfs on /var/tmp type tmpfs (rw,nosuid,noatime,size=30720k)
> tmpfs on /var/log type tmpfs (rw,nosuid,noatime,size=102400k,mode=755)
>
> There is no swap running as all this does is SSH connection handling.
>
> I have plenty of old small (8Gb) SD Cards to replace the one in use but
> I don't want to have to be copying a new one more often than needed.
>
> Is there anything else that really needs doing or is this sufficient?
>

It sounds like you usage is a fit for running with the root file system
readonly. If you make all the SD card filesystems readonly, then that
gets rid of the problems (except things like bad contacts etc :-( )

How to get to running a readonly root filesystem depends on your setup,
but I'm sure there is advice out there.

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