[Kea-users] kea-dhcp4 service failing to start with 'cannot open shared object file'
duress at mailbox.org
duress at mailbox.org
Fri Feb 20 08:22:47 UTC 2026
I'm really so confused now, I clearly remember copy/pasting the file path from the error multiple times to confirm that the file it reported missing was not missing. I'm not sure what I missed.
Anyway... changing the config file to point at the other kea libs directory solved the issue, thanks a ton!
> On 02/20/2026 9:18 AM CET duress via Kea-users <kea-users at lists.isc.org> wrote:
>
>
> huh, yeah, you're right.
> you know, I'd noticed that both paths were showing up, but I think i just assumed one was a symlink to the other and didn't actually check...
>
> root at diorite:/usr/sbin# stat /usr/local/lib/aarch64-linux-gnu/libkea-dhcpsrv.so.145
> File: /usr/local/lib/aarch64-linux-gnu/libkea-dhcpsrv.so.145 -> libkea-dhcpsrv.so.145.0.0
> Size: 25 Blocks: 0 IO Block: 4096 symbolic link
> Device: 179,2 Inode: 390224 Links: 1
> Access: (0777/lrwxrwxrwx) Uid: ( 0/ root) Gid: ( 0/ root)
> Access: 2026-02-19 06:19:39.372553824 -0800
> Modify: 2026-02-13 22:16:56.281120351 -0800
> Change: 2026-02-13 22:16:56.281120351 -0800
> Birth: 2026-02-13 22:16:56.281120351 -0800
>
>
> > On 02/20/2026 9:13 AM CET Razvan Becheriu <razvan at isc.org> wrote:
> >
> >
> > I think the issue is that there are 2 paths:
> >
> > /usr/local/lib/aarch64-linux-gnu/libkea-dhcpsrv.so
> >
> > and
> >
> > /usr/lib/aarch64-linux-gnu/libkea-dhcpsrv.so
> >
> > one exists and one does not
> >
> > kea seems to load the existing one but ha hook lib requires the other path.
> >
> >
> >
> >
> > > ---------------------------------------------
> > > From: Razvan <razvan at isc.org>
> > > To: Kea <kea-users at lists.isc.org>
> > > Date: Friday, 20 February 2026 10:09 AM EET
> > > Subject: Re: [Kea-users] kea-dhcp4 service failing to start with 'cannot open shared object file'
> > >
> > > I can't find the strace output attached. maybe the file is too large.
> > >
> > > can you share it using some other way?
> > >
> > > thx
> > >
> > >
> > > > ---------------------------------------------
> > > > From: Razvan <razvan at isc.org>
> > > > To: Kea <kea-users at lists.isc.org>
> > > > Date: Friday, 20 February 2026 10:08 AM EET
> > > > Subject: Re: [Kea-users] kea-dhcp4 service failing to start with 'cannot open shared object file'
> > > >
> > > >
> > > > is there a link named:
> > > >
> > > > /usr/lib/aarch64-linux-gnu/libkea-dhcpsrv.so.145 ?
> > > >
> > > >
> > > >
> > > > ls -la /usr/lib/aarch64-linux-gnu/
> > > >
> > > >
> > > >
> > > > > ---------------------------------------------
> > > > > From: Razvan <razvan at isc.org>
> > > > > To: Kea <kea-users at lists.isc.org>
> > > > > Date: Friday, 20 February 2026 10:00 AM EET
> > > > > Subject: Re: [Kea-users] kea-dhcp4 service failing to start with 'cannot open shared object file'
> > > > >
> > > > >
> > > > > thank you for the output. will look into it.
> > > > >
> > > > > also attach the output of the ./kea-dhcp4 -W
> > > > >
> > > > > I am suspecting this is a compilation issue with no relocation capabilities ..aka -fPIC for dynamic libs.
> > > > >
> > > > > Thank you
> > > > >
> > > > >
> > > > >
> > > > > > ---------------------------------------------
> > > > > > From: duress <kea-users at lists.isc.org>
> > > > > > To: Kea <kea-users at lists.isc.org>
> > > > > > Cc: duress <duress at mailbox.org>
> > > > > > Date: Friday, 20 February 2026 9:50 AM EET
> > > > > > Subject: Re: [Kea-users] kea-dhcp4 service failing to start with 'cannot open shared object file'
> > > > > >
> > > > > > Output of strace -f attached.
> > > > > >
> > > > > > Regarding the reference to libkea-dhcpsrv.sp, my presumption has been that that file is mentioned because it is what's trying to load libdhcp_ha.so, but i can't say i know that for certain.
> > > > > > ldd of libkea-dhcpsrv.so also reports no errors:
> > > > > >
> > > > > > root at diorite:/etc/kea# ldd /usr/lib/aarch64-linux-gnu/libkea-dhcpsrv.so
> > > > > > linux-vdso.so.1 (0x0000ffffbf2cd000)
> > > > > > libmysqlclient.so.21 => /lib/aarch64-linux-gnu/libmysqlclient.so.21 (0x0000ffffbe8c0000)
> > > > > > libpq.so.5 => /lib/aarch64-linux-gnu/libpq.so.5 (0x0000ffffbe840000)
> > > > > > libkea-process.so.57 => /lib/aarch64-linux-gnu/libkea-process.so.57 (0x0000ffffbe7e0000)
> > > > > > libkea-eval.so.52 => /lib/aarch64-linux-gnu/libkea-eval.so.52 (0x0000ffffbe770000)
> > > > > > libkea-dhcp_ddns.so.41 => /lib/aarch64-linux-gnu/libkea-dhcp_ddns.so.41 (0x0000ffffbe700000)
> > > > > > libkea-stats.so.29 => /lib/aarch64-linux-gnu/libkea-stats.so.29 (0x0000ffffbe6c0000)
> > > > > > libkea-dhcp++.so.74 => /lib/aarch64-linux-gnu/libkea-dhcp++.so.74 (0x0000ffffbe590000)
> > > > > > libkea-hooks.so.78 => /lib/aarch64-linux-gnu/libkea-hooks.so.78 (0x0000ffffbe540000)
> > > > > > libkea-mysql.so.53 => /lib/aarch64-linux-gnu/libkea-mysql.so.53 (0x0000ffffbe500000)
> > > > > > libkea-pgsql.so.53 => /lib/aarch64-linux-gnu/libkea-pgsql.so.53 (0x0000ffffbe4b0000)
> > > > > > libkea-database.so.48 => /lib/aarch64-linux-gnu/libkea-database.so.48 (0x0000ffffbe460000)
> > > > > > libkea-cc.so.54 => /lib/aarch64-linux-gnu/libkea-cc.so.54 (0x0000ffffbe3f0000)
> > > > > > libkea-asiolink.so.56 => /lib/aarch64-linux-gnu/libkea-asiolink.so.56 (0x0000ffffbe370000)
> > > > > > libkea-cryptolink.so.38 => /lib/aarch64-linux-gnu/libkea-cryptolink.so.38 (0x0000ffffbe340000)
> > > > > > libkea-log.so.48 => /lib/aarch64-linux-gnu/libkea-log.so.48 (0x0000ffffbe2f0000)
> > > > > > libkea-util.so.68 => /lib/aarch64-linux-gnu/libkea-util.so.68 (0x0000ffffbe270000)
> > > > > > libkea-exceptions.so.23 => /lib/aarch64-linux-gnu/libkea-exceptions.so.23 (0x0000ffffbe240000)
> > > > > > libstdc++.so.6 => /lib/aarch64-linux-gnu/libstdc++.so.6 (0x0000ffffbdfb0000)
> > > > > > libc.so.6 => /lib/aarch64-linux-gnu/libc.so.6 (0x0000ffffbddf0000)
> > > > > > /lib/ld-linux-aarch64.so.1 (0x0000ffffbf280000)
> > > > > > libgcc_s.so.1 => /lib/aarch64-linux-gnu/libgcc_s.so.1 (0x0000ffffbddb0000)
> > > > > > libssl.so.3 => /lib/aarch64-linux-gnu/libssl.so.3 (0x0000ffffbdce0000)
> > > > > > libcrypto.so.3 => /lib/aarch64-linux-gnu/libcrypto.so.3 (0x0000ffffbd860000)
> > > > > > libresolv.so.2 => /lib/aarch64-linux-gnu/libresolv.so.2 (0x0000ffffbd830000)
> > > > > > libz.so.1 => /lib/aarch64-linux-gnu/libz.so.1 (0x0000ffffbd7f0000)
> > > > > > libzstd.so.1 => /lib/aarch64-linux-gnu/libzstd.so.1 (0x0000ffffbd730000)
> > > > > > libgssapi_krb5.so.2 => /lib/aarch64-linux-gnu/libgssapi_krb5.so.2 (0x0000ffffbd6c0000)
> > > > > > libldap.so.2 => /lib/aarch64-linux-gnu/libldap.so.2 (0x0000ffffbd640000)
> > > > > > libkea-cfgclient.so.51 => /lib/aarch64-linux-gnu/libkea-cfgclient.so.51 (0x0000ffffbd5d0000)
> > > > > > libkea-dns++.so.42 => /lib/aarch64-linux-gnu/libkea-dns++.so.42 (0x0000ffffbd4c0000)
> > > > > > liblog4cplus-2.0.so.3 => /lib/aarch64-linux-gnu/liblog4cplus-2.0.so.3 (0x0000ffffbd420000)
> > > > > > libm.so.6 => /lib/aarch64-linux-gnu/libm.so.6 (0x0000ffffbd370000)
> > > > > > libkrb5.so.3 => /lib/aarch64-linux-gnu/libkrb5.so.3 (0x0000ffffbd290000)
> > > > > > libk5crypto.so.3 => /lib/aarch64-linux-gnu/libk5crypto.so.3 (0x0000ffffbd240000)
> > > > > > libcom_err.so.2 => /lib/aarch64-linux-gnu/libcom_err.so.2 (0x0000ffffbd210000)
> > > > > > libkrb5support.so.0 => /lib/aarch64-linux-gnu/libkrb5support.so.0 (0x0000ffffbd1e0000)
> > > > > > liblber.so.2 => /lib/aarch64-linux-gnu/liblber.so.2 (0x0000ffffbd1b0000)
> > > > > > libsasl2.so.2 => /lib/aarch64-linux-gnu/libsasl2.so.2 (0x0000ffffbd170000)
> > > > > > libgnutls.so.30 => /lib/aarch64-linux-gnu/libgnutls.so.30 (0x0000ffffbcf50000)
> > > > > > libkea-http.so.56 => /lib/aarch64-linux-gnu/libkea-http.so.56 (0x0000ffffbce50000)
> > > > > > libkeyutils.so.1 => /lib/aarch64-linux-gnu/libkeyutils.so.1 (0x0000ffffbce20000)
> > > > > > libp11-kit.so.0 => /lib/aarch64-linux-gnu/libp11-kit.so.0 (0x0000ffffbcc50000)
> > > > > > libidn2.so.0 => /lib/aarch64-linux-gnu/libidn2.so.0 (0x0000ffffbcc10000)
> > > > > > libunistring.so.5 => /lib/aarch64-linux-gnu/libunistring.so.5 (0x0000ffffbca40000)
> > > > > > libtasn1.so.6 => /lib/aarch64-linux-gnu/libtasn1.so.6 (0x0000ffffbca00000)
> > > > > > libnettle.so.8 => /lib/aarch64-linux-gnu/libnettle.so.8 (0x0000ffffbc990000)
> > > > > > libhogweed.so.6 => /lib/aarch64-linux-gnu/libhogweed.so.6 (0x0000ffffbc920000)
> > > > > > libgmp.so.10 => /lib/aarch64-linux-gnu/libgmp.so.10 (0x0000ffffbc880000)
> > > > > > libffi.so.8 => /lib/aarch64-linux-gnu/libffi.so.8 (0x0000ffffbc850000)
> > > > > >
> > > > > > > On 02/20/2026 8:31 AM CET Razvan Becheriu <razvan at isc.org> wrote:
> > > > > > >
> > > > > > >
> > > > > > > please run stract -f -o outout ./kea-dhcp4 -c ... and attach the output.
> > > > > > >
> > > > > > > (no filter on paths)Thank you,
> > > > > > >
> > > > > > > Razvan
> > > > > > >
> > > > > > > > ---------------------------------------------
> > > > > > > > From: Razvan <razvan at isc.org>
> > > > > > > > To: Kea <kea-users at lists.isc.org>
> > > > > > > > Date: Friday, 20 February 2026 9:27 AM EET
> > > > > > > > Subject: Re: [Kea-users] kea-dhcp4 service failing to start with 'cannot open shared object file'
> > > > > > > >
> > > > > > > > what is this:
> > > > > > > >
> > > > > > > > HOOKS_OPEN_ERROR failed to open hook library libdhcp_ha.so: libkea-dhcpsrv.so.14
> > > > > > > >
> > > > > > > > why does it mention libkea-dhcpsrv.so ?
> > > > > > > >
> > > > > > > > ldd on this lib then
> > > > > > > >
> > > > > > > >
> > > > > > > > > ---------------------------------------------
> > > > > > > > > From: duress <kea-users at lists.isc.org>
> > > > > > > > > To: Kea <kea-users at lists.isc.org>
> > > > > > > > > Cc: duress <duress at mailbox.org>
> > > > > > > > > Date: Friday, 20 February 2026 9:18 AM EET
> > > > > > > > > Subject: Re: [Kea-users] kea-dhcp4 service failing to start with 'cannot open shared object file'
> > > > > > > > >
> > > > > > > > > I tried truncating the library path value to just the file base name:
> > > > > > > > > <...> "library": "libdhcp_ha.so", <...>
> > > > > > > > > the changed path value was reflected in the error message I got after starting the service again, but it didn't seem to improve the issue at all:
> > > > > > > > > Feb 19 23:08:23 diorite kea-dhcp4[4551]: ERROR HOOKS_OPEN_ERROR failed to open hook library libdhcp_ha.so: libkea-dhcpsrv.so.145: cannot open shared object file: No such file or directory
> > > > > > > > >
> > > > > > > > >
> > > > > > > > > I don't see any issues loading dependencies for libdhcp_ha.so, and there's an error as expected for the nonexistent file.
> > > > > > > > >
> > > > > > > > > root at diorite:/etc/kea# ldd /usr/local/lib/aarch64-linux-gnu/kea/hooks/libdhcp_ha.so
> > > > > > > > > linux-vdso.so.1 (0x0000ffff83b55000)
> > > > > > > > > libkea-dhcpsrv.so.145 => /usr/local/lib/aarch64-linux-gnu/libkea-dhcpsrv.so.145 (0x0000ffff83650000)
> > > > > > > > > libkea-process.so.104 => /usr/local/lib/aarch64-linux-gnu/libkea-process.so.104 (0x0000ffff835e0000)
> > > > > > > > > libkea-stats.so.64 => /usr/local/lib/aarch64-linux-gnu/libkea-stats.so.64 (0x0000ffff83590000)
> > > > > > > > > libkea-config.so.96 => /usr/local/lib/aarch64-linux-gnu/libkea-config.so.96 (0x0000ffff834f0000)
> > > > > > > > > libkea-http.so.99 => /usr/local/lib/aarch64-linux-gnu/libkea-http.so.99 (0x0000ffff833a0000)
> > > > > > > > > libkea-dhcp.so.124 => /usr/local/lib/aarch64-linux-gnu/libkea-dhcp.so.124 (0x0000ffff831f0000)
> > > > > > > > > libkea-hooks.so.134 => /usr/local/lib/aarch64-linux-gnu/libkea-hooks.so.134 (0x0000ffff83190000)
> > > > > > > > > libkea-cc.so.95 => /usr/local/lib/aarch64-linux-gnu/libkea-cc.so.95 (0x0000ffff83110000)
> > > > > > > > > libkea-asiolink.so.102 => /usr/local/lib/aarch64-linux-gnu/libkea-asiolink.so.102 (0x0000ffff83070000)
> > > > > > > > > libkea-log.so.86 => /usr/local/lib/aarch64-linux-gnu/libkea-log.so.86 (0x0000ffff83020000)
> > > > > > > > > libkea-util.so.116 => /usr/local/lib/aarch64-linux-gnu/libkea-util.so.116 (0x0000ffff82f80000)
> > > > > > > > > libkea-exceptions.so.55 => /usr/local/lib/aarch64-linux-gnu/libkea-exceptions.so.55 (0x0000ffff82f50000)
> > > > > > > > > libcrypto.so.3 => /lib/aarch64-linux-gnu/libcrypto.so.3 (0x0000ffff82ad0000)
> > > > > > > > > libstdc++.so.6 => /lib/aarch64-linux-gnu/libstdc++.so.6 (0x0000ffff82840000)
> > > > > > > > > libgcc_s.so.1 => /lib/aarch64-linux-gnu/libgcc_s.so.1 (0x0000ffff82800000)
> > > > > > > > > libc.so.6 => /lib/aarch64-linux-gnu/libc.so.6 (0x0000ffff82640000)
> > > > > > > > > /lib/ld-linux-aarch64.so.1 (0x0000ffff83b10000)
> > > > > > > > > libkea-eval.so.97 => /usr/local/lib/aarch64-linux-gnu/libkea-eval.so.97 (0x0000ffff82590000)
> > > > > > > > > libkea-dhcp_ddns.so.79 => /usr/local/lib/aarch64-linux-gnu/libkea-dhcp_ddns.so.79 (0x0000ffff82510000)
> > > > > > > > > libkea-database.so.87 => /usr/local/lib/aarch64-linux-gnu/libkea-database.so.87 (0x0000ffff824c0000)
> > > > > > > > > libkea-cryptolink.so.75 => /usr/local/lib/aarch64-linux-gnu/libkea-cryptolink.so.75 (0x0000ffff82490000)
> > > > > > > > > libkea-cfgrpt.so.3 => /usr/local/lib/aarch64-linux-gnu/libkea-cfgrpt.so.3 (0x0000ffff82460000)
> > > > > > > > > libssl.so.3 => /lib/aarch64-linux-gnu/libssl.so.3 (0x0000ffff82390000)
> > > > > > > > > libkea-dns.so.83 => /usr/local/lib/aarch64-linux-gnu/libkea-dns.so.83 (0x0000ffff822a0000)
> > > > > > > > > libkea-log-interprocess.so.4 => /usr/local/lib/aarch64-linux-gnu/libkea-log-interprocess.so.4 (0x0000ffff82270000)
> > > > > > > > > liblog4cplus-2.0.so.3 => /lib/aarch64-linux-gnu/liblog4cplus-2.0.so.3 (0x0000ffff821d0000)
> > > > > > > > > libm.so.6 => /lib/aarch64-linux-gnu/libm.so.6 (0x0000ffff82120000)
> > > > > > > > >
> > > > > > > > > root at diorite:/etc/kea# ldd /usr/local/lib/aarch64-linux-gnu/kea/hooks/libdhcp_nosuchfile.so
> > > > > > > > > ldd: /usr/local/lib/aarch64-linux-gnu/kea/hooks/libdhcp_nosuchfile.so: No such file or directory
> > > > > > > > >
> > > > > > > > >
> > > > > > > > > > On 02/20/2026 6:44 AM CET Razvan Becheriu <razvan at isc.org> wrote:
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > > can you run:
> > > > > > > > > >
> > > > > > > > > > ldd /usr/local/lib/aarch64-linux-gnu/kea/hooks/libdhcp_nosuchfile.so
> > > > > > > > > >
> > > > > > > > > > and
> > > > > > > > > >
> > > > > > > > > > ldd /usr/local/lib/aarch64-linux-gnu/kea/hooks/libdhcp_ha.so
> > > > > > > > > >
> > > > > > > > > > check that all dependencies can be resolved.
> > > > > > > > > >
> > > > > > > > > > Regards,
> > > > > > > > > > Razvan
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > > > ---------------------------------------------
> > > > > > > > > > > From: Razvan <razvan at isc.org>
> > > > > > > > > > > To: Kea <kea-users at lists.isc.org>
> > > > > > > > > > > Date: Friday, 20 February 2026 7:37 AM EET
> > > > > > > > > > > Subject: Re: [Kea-users] kea-dhcp4 service failing to start with 'cannot open shared object file'
> > > > > > > > > > >
> > > > > > > > > > > Hi,
> > > > > > > > > > >
> > > > > > > > > > > Kea can load hook libraries from default path just by specifying the hook name:
> > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > > > "library": "libdhcp_nosuchfile.so"
> > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > > > You can try this and see if it is any different.
> > > > > > > > > > > I'll try to replicate the issue using my rpi. Will let you know how it goes.
> > > > > > > > > > >
> > > > > > > > > > > Regards,
> > > > > > > > > > > Razvan
> > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > > > > ---------------------------------------------
> > > > > > > > > > > > From: Andrew <kea-users at lists.isc.org>
> > > > > > > > > > > > To: kea-users <kea-users at lists.isc.org>
> > > > > > > > > > > > Cc: Andrew <duress at mailbox.org>
> > > > > > > > > > > > Date: Friday, 20 February 2026 12:34 AM EET
> > > > > > > > > > > > Subject: [Kea-users] kea-dhcp4 service failing to start with 'cannot open shared object file'
> > > > > > > > > > > >
> > > > > > > > > > > > Hi, I'm trying to set up a hot-standby redundant dhcp server for my home network and I'm having a real struggle trying to get the kea-dhcp4 daemon to find and load the libdhcp_ha.so library hook so that it can run in HA mode.
> > > > > > > > > > > > It's working great when I don't ask it to load the HA library hook, but I'm not having any luck with loading the .so. When I try to start the official ubuntu-package-provided kea-dhcp4-server systemd service, it reports the following:
> > > > > > > > > > > > ERROR HOOKS_OPEN_ERROR failed to open hook library /usr/local/lib/aarch64-linux-gnu/kea/hooks/libdhcp_nosuchfile.so: /usr/local/lib/aarch64-linux-gnu/kea/hooks/libdhcp_nosuchfile.so: cannot open shared object file: No such file or directory
> > > > > > > > > > > >
> > > > > > > > > > > > I believe the issue being reported by the service in my system logs is actually something other than a failed read operation on the listed path, and I can explain my reasoning for drawing this conclusion.
> > > > > > > > > > > > I am hoping someone with the patience to read all this can suggest something I should try that I haven't thought of yet, or point out an error that I've made, that will help me get my HA pair online! thanks in advance for your attention.
> > > > > > > > > > > >
> > > > > > > > > > > > Here's a list of the things I have tried so far to fix this issue in approximate chronological order:
> > > > > > > > > > > > * I manually confirmed that the file exists, by copying the full file name and path directly from the error message and pasting it into the terminal. the file exists.
> > > > > > > > > > > >
> > > > > > > > > > > > * checked the unix file permissions on the .so itself (at /usr/local/lib/aarch64-linux-gnu/kea/hooks/libdhcp_sh.so), and also of each directory in that file path all the way down to /usr.
> > > > > > > > > > > > all have mode o+r set, and I have confirmed that I can read the contents of the file from a shell running as the kea user (_kea on my system). it is not a file permissions error.
> > > > > > > > > > > >
> > > > > > > > > > > > * checked for enhanced access control subsystems. selinux is not installed on this server. apparmor is installed, and when I checked my kernel log I found that apparmor was reporting some blocked access to the library hook file in question.
> > > > > > > > > > > > I addressed these by updating the apparmor profile for /usr/sbin/kea-dhcp4, which required adding explicit permits for the r and m masks.
> > > > > > > > > > > > I made these changes by hand at first, then reset and used the aa-genprof tool from the official apparmor-utils package which generated the same set of changes I had applied by hand. These changes fixed the apparmor permissions conflict that was reported in my kernel log.
> > > > > > > > > > > > I confirmed that apparmor was no longer responsible for blocking access to the file by shutting off apparmor protections system-wide, which did not fix the issue.
> > > > > > > > > > > >
> > > > > > > > > > > > * I copied the target .so file to a new directory under /etc/kea/lib/, and updated the service configs and the apparmor profile to point at this new file location.
> > > > > > > > > > > > The service continued to report that it cannot open the file because it does not exist, this time naming the new path under /etc/kea/lib/. I again copy-pasted the path from the error message to ensure I hadn't made any errors in my typing.
> > > > > > > > > > > > This didn't produce any positive results, so I reverted the configs to point to the default path to avoid unnecessary complication in further debugging.
> > > > > > > > > > > >
> > > > > > > > > > > > * I found the presented troubleshooting advice in the official kea-dhcp4-server install guide from ISC, which indicates that in cases exactly like the one I was dealing with, one should run ldconfig with root permissions to update the linker cache. I did this.
> > > > > > > > > > > > I checked that the directory path containing the library was listed in a file under /etc/ld.so.conf.d/. I checked that /etc/ld.so.conf.d/ was correctly included in /etc/ld.so.conf. I ran ldconfig again as root while explicitly passing the directory immediately containing the .do file.
> > > > > > > > > > > > I ran ldconfig -p | grep to confirm that the desired shared object file was present in the cache, and that it was indexed at the expected file path, which it was.
> > > > > > > > > > > > Out of pure superstition, I even rebooted the server and checked again -- still present in the cache at the correct path.
> > > > > > > > > > > >
> > > > > > > > > > > > * I opened the systemd service unit file to look for clues about any restricted filesystem access, system call capabilities, or anything else of this nature. I didn't find any in the unit file for this service.
> > > > > > > > > > > >
> > > > > > > > > > > > * I explicitly added LD_LIBRARY_PATH=/usr/local/lib/aarch64-linux-gnu/kea/hooks to the service's environment variables exposed by systemd, then reloaded the systemd daemon to read the unit file changes. no help.
> > > > > > > > > > > >
> > > > > > > > > > > > * I inserted strace into the unit file exec line to report any system calls related to the target file, reloaded the systemd daemon, and attempted to start the service again.
> > > > > > > > > > > > For comparison, I edited the service config at /etc/kea/kea-dhcp4.conf and the strace invocation in the service unit file to look for a known-bogus .so file in the same directory, reloaded the daemon again, and started the service again.
> > > > > > > > > > > > Comparing the strace output from the two calls, there is a clear difference between the system calls and results reported by strace. In the output from the service start with a known-bad file path, strace reports a single openat() system call to the expected file, which as expected returns -1 with errno ENOENT.
> > > > > > > > > > > > By comparison, the strace output from the service start with configs pointing to the real .so file which should be accessible to the service shows 6 system calls related to the .so file in question: openat(), read(), fstat(), mmap(), mmap(), close(). none of these system calls are shown to have errored with an associated errno code, or to have returned with a negative value.
> > > > > > > > > > > > At this point I'm not really sure where to go, I am intimidated by the prospect of trying to dive into the kea-dhcp codebase and figure out what is reporting an ENOENT-related error message when there (seemingly, to my eyes) doesn't seem to be any such error occurring.
> > > > > > > > > > > >
> > > > > > > > > > > > I am using binaries and config files as provided from the Ubuntu repos (24.04, arm64), running on a raspberry pi 5, unmodified except as mentioned above and for miscellaneous config changes to /etc/kea/kea-dhcp4.conf to suit the needs of my network.
> > > > > > > > > > > >
> > > > > > > > > > > > The debian packages I'm using are as follows:
> > > > > > > > > > > > ii kea-admin 2.4.1-3ubuntu0.1 arm64 Administration utilities for Kea DHCP server
> > > > > > > > > > > > ii kea-common 2.4.1-3ubuntu0.1 arm64 Common libraries for the Kea DHCP server
> > > > > > > > > > > > ii kea-dev 2.4.1-3ubuntu0.1 arm64 Development headers for Kea DHCP server
> > > > > > > > > > > > ii kea-dhcp4-server 2.4.1-3ubuntu0.1 arm64 IPv4 DHCP server
> > > > > > > > > > > >
> > > > > > > > > > > > The kea version number reported by the binary that shipped with the above packages is 3.1.5
> > > > > > > > > > > >
> > > > > > > > > > > > I am putting a copy of some relevant terminal buffers and config files up on my public webserver for reference, links to follow:
> > > > > > > > > > > >
> > > > > > > > > > > > (config files doctored to target a nonexistent libdhcp_nosuchfile.so)
> > > > > > > > > > > > https://pdxlents.online/kea-dhcp4.conf.bad_configs.txt
> > > > > > > > > > > > https://pdxlents.online/systemd_unit_file.bad_configs.txt
> > > > > > > > > > > > https://pdxlents.online/terminal_log.bad_configs.txt
> > > > > > > > > > > >
> > > > > > > > > > > > (config files targeting an actually existing libdhcp_ha.so)
> > > > > > > > > > > > https://pdxlents.online/kea-dhcp4.conf.good_configs.txt
> > > > > > > > > > > > https://pdxlents.online/terminal_log.good_configs.txt
> > > > > > > > > > > > https://pdxlents.online/systemd_unit_file.good_configs.txt
> > > > > > > > > > > >
> > > > > > > > > > > > (version output from my server binary)
> > > > > > > > > > > > https://pdxlents.online/kea-dhcp4_-V.txt
> > > > > > > > > > > >
> > > > > > > > > > > > Thanks again for reading, and for any advice or suggestions!
> > > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > > --
> > > > > > > > > > ISC funds the development of this software with paid support subscriptions. Contact us at https://www.isc.org/contact/ for more information.
> > > > > > > > > >
> > > > > > > > > > To unsubscribe visit https://lists.isc.org/mailman/listinfo/kea-users.
> > > > > > > > > > Kea-users at lists.isc.org
> > > > > > > > > >
> > > > > > > > >
> > > > > > > >
> > > > > > > --
> > > > > > > ISC funds the development of this software with paid support subscriptions. Contact us at https://www.isc.org/contact/ for more information.
> > > > > > >
> > > > > > > To unsubscribe visit https://lists.isc.org/mailman/listinfo/kea-users.
> > > > > > > Kea-users at lists.isc.org
> > > > > > >
> > > > > >
> > > > >
> > > >
> > >
> > --
> > ISC funds the development of this software with paid support subscriptions. Contact us at https://www.isc.org/contact/ for more information.
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> > Kea-users at lists.isc.org
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