Re: [chrony-users] Debian stretch read only rootfs?

["Kevin P. Fleming" <kevin@xxxxxxx>]

'systemctl show chrony' on my Debian system includes this line:

ReadWritePaths=/run /var/lib/chrony -/var/log -/var/spool

On Fri, Feb 4, 2022 at 11:07 AM Matthew Eshleman
<matthew@xxxxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> Hello all,
>
> I've been experimenting with chrony for an embedded linux system and we have decided to move forward, adding NTP as a feature to this device, using chrony. Previously this device only supported human manual time entry. All experiments to-date have been on a development unit with a fairly normal read/write debian rootfs.
>
> This device is currently using debian stretch, and we use a multistrap approach to generate our rootfs, which is then packaged into a read only rootfs using squashfs for our production configuration.
>
> In my attempts so far, chrony fails to start. We have a ramfs overlay for /etc/ and I added one for /var/lib/chrony as well. The logs/journal did not point me to the exact folder/file that is blocking chrony from starting with a read only root filesystem, and I didn't find specific hints via google (except for some redhat patch, that I do not believe applies here...)
>
> Additionally, I configured chrony to use a drift file that is on a separate read/write partition.
>
> What additional files/folders does chrony need to be read/write?
>
> Logs and such are below:
>
> Feb 04 15:19:34 M systemd[1]: Started Raise network interfaces.
> Feb 04 15:19:34 M systemd[1]: Reached target Network.
> Feb 04 15:19:34 M systemd[1]: chrony.service: Failed to run 'start' task: Read-only file system
> Feb 04 15:19:34 M systemd[1]: Failed to start chrony, an NTP client/server.
> Feb 04 15:19:35 M systemd[1]: chrony.service: Unit entered failed state.
> Feb 04 15:19:35 M systemd[1]: chrony.service: Failed with result 'resources'.
>
> systemctl status chrony
> ● chrony.service - chrony, an NTP client/server
>    Loaded: loaded (/lib/systemd/system/chrony.service; enabled; vendor preset: e
>    Active: failed (Result: resources)
>      Docs: man:chronyd(8)
>            man:chronyc(1)
>            man:chrony.conf(5)
>
> ~# df
> Filesystem     1K-blocks   Used Available Use% Mounted on
> /dev/root         257664 257664         0 100% /
> devtmpfs          167400      0    167400   0% /dev
> tmpfs             167912      0    167912   0% /dev/shm
> tmpfs             167912    960    166952   1% /run
> tmpfs               5120      8      5112   1% /run/lock
> tmpfs             167912      0    167912   0% /sys/fs/cgroup
> tmpfs               1024      0      1024   0% /var/lib/chrony
> tmpfs               2048     16      2032   1% /run_etc_tmpfs
> tmpfs             167912      0    167912   0% /tmp
> tmpfs               1024      4      1020   1% /var/lib/dhcp
> overlay             2048     16      2032   1% /etc
> /dev/mmcblk0p5    122835   2612    113670   3% /media/settings
>
> chronyd version 3.0 (+CMDMON +NTP +REFCLOCK +RTC +PRIVDROP +SCFILTER +SECHASH +SIGND +ASYNCDNS +IPV6 -DEBUG)
>
> Thank you very much for any pointers, tips, etc.
>
> Best regards,
>
> Matthew
>

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