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Output of strace -f attached.
<br>
<br>
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.
<br>
ldd of libkea-dhcpsrv.so also reports no errors:
<br>
<br>
root@diorite:/etc/kea# ldd /usr/lib/aarch64-linux-gnu/libkea-dhcpsrv.so
<br>
linux-vdso.so.1 (0x0000ffffbf2cd000)
<br>
libmysqlclient.so.21 => /lib/aarch64-linux-gnu/libmysqlclient.so.21 (0x0000ffffbe8c0000)
<br>
libpq.so.5 => /lib/aarch64-linux-gnu/libpq.so.5 (0x0000ffffbe840000)
<br>
libkea-process.so.57 => /lib/aarch64-linux-gnu/libkea-process.so.57 (0x0000ffffbe7e0000)
<br>
libkea-eval.so.52 => /lib/aarch64-linux-gnu/libkea-eval.so.52 (0x0000ffffbe770000)
<br>
libkea-dhcp_ddns.so.41 => /lib/aarch64-linux-gnu/libkea-dhcp_ddns.so.41 (0x0000ffffbe700000)
<br>
libkea-stats.so.29 => /lib/aarch64-linux-gnu/libkea-stats.so.29 (0x0000ffffbe6c0000)
<br>
libkea-dhcp++.so.74 => /lib/aarch64-linux-gnu/libkea-dhcp++.so.74 (0x0000ffffbe590000)
<br>
libkea-hooks.so.78 => /lib/aarch64-linux-gnu/libkea-hooks.so.78 (0x0000ffffbe540000)
<br>
libkea-mysql.so.53 => /lib/aarch64-linux-gnu/libkea-mysql.so.53 (0x0000ffffbe500000)
<br>
libkea-pgsql.so.53 => /lib/aarch64-linux-gnu/libkea-pgsql.so.53 (0x0000ffffbe4b0000)
<br>
libkea-database.so.48 => /lib/aarch64-linux-gnu/libkea-database.so.48 (0x0000ffffbe460000)
<br>
libkea-cc.so.54 => /lib/aarch64-linux-gnu/libkea-cc.so.54 (0x0000ffffbe3f0000)
<br>
libkea-asiolink.so.56 => /lib/aarch64-linux-gnu/libkea-asiolink.so.56 (0x0000ffffbe370000)
<br>
libkea-cryptolink.so.38 => /lib/aarch64-linux-gnu/libkea-cryptolink.so.38 (0x0000ffffbe340000)
<br>
libkea-log.so.48 => /lib/aarch64-linux-gnu/libkea-log.so.48 (0x0000ffffbe2f0000)
<br>
libkea-util.so.68 => /lib/aarch64-linux-gnu/libkea-util.so.68 (0x0000ffffbe270000)
<br>
libkea-exceptions.so.23 => /lib/aarch64-linux-gnu/libkea-exceptions.so.23 (0x0000ffffbe240000)
<br>
libstdc++.so.6 => /lib/aarch64-linux-gnu/libstdc++.so.6 (0x0000ffffbdfb0000)
<br>
libc.so.6 => /lib/aarch64-linux-gnu/libc.so.6 (0x0000ffffbddf0000)
<br>
/lib/ld-linux-aarch64.so.1 (0x0000ffffbf280000)
<br>
libgcc_s.so.1 => /lib/aarch64-linux-gnu/libgcc_s.so.1 (0x0000ffffbddb0000)
<br>
libssl.so.3 => /lib/aarch64-linux-gnu/libssl.so.3 (0x0000ffffbdce0000)
<br>
libcrypto.so.3 => /lib/aarch64-linux-gnu/libcrypto.so.3 (0x0000ffffbd860000)
<br>
libresolv.so.2 => /lib/aarch64-linux-gnu/libresolv.so.2 (0x0000ffffbd830000)
<br>
libz.so.1 => /lib/aarch64-linux-gnu/libz.so.1 (0x0000ffffbd7f0000)
<br>
libzstd.so.1 => /lib/aarch64-linux-gnu/libzstd.so.1 (0x0000ffffbd730000)
<br>
libgssapi_krb5.so.2 => /lib/aarch64-linux-gnu/libgssapi_krb5.so.2 (0x0000ffffbd6c0000)
<br>
libldap.so.2 => /lib/aarch64-linux-gnu/libldap.so.2 (0x0000ffffbd640000)
<br>
libkea-cfgclient.so.51 => /lib/aarch64-linux-gnu/libkea-cfgclient.so.51 (0x0000ffffbd5d0000)
<br>
libkea-dns++.so.42 => /lib/aarch64-linux-gnu/libkea-dns++.so.42 (0x0000ffffbd4c0000)
<br>
liblog4cplus-2.0.so.3 => /lib/aarch64-linux-gnu/liblog4cplus-2.0.so.3 (0x0000ffffbd420000)
<br>
libm.so.6 => /lib/aarch64-linux-gnu/libm.so.6 (0x0000ffffbd370000)
<br>
libkrb5.so.3 => /lib/aarch64-linux-gnu/libkrb5.so.3 (0x0000ffffbd290000)
<br>
libk5crypto.so.3 => /lib/aarch64-linux-gnu/libk5crypto.so.3 (0x0000ffffbd240000)
<br>
libcom_err.so.2 => /lib/aarch64-linux-gnu/libcom_err.so.2 (0x0000ffffbd210000)
<br>
libkrb5support.so.0 => /lib/aarch64-linux-gnu/libkrb5support.so.0 (0x0000ffffbd1e0000)
<br>
liblber.so.2 => /lib/aarch64-linux-gnu/liblber.so.2 (0x0000ffffbd1b0000)
<br>
libsasl2.so.2 => /lib/aarch64-linux-gnu/libsasl2.so.2 (0x0000ffffbd170000)
<br>
libgnutls.so.30 => /lib/aarch64-linux-gnu/libgnutls.so.30 (0x0000ffffbcf50000)
<br>
libkea-http.so.56 => /lib/aarch64-linux-gnu/libkea-http.so.56 (0x0000ffffbce50000)
<br>
libkeyutils.so.1 => /lib/aarch64-linux-gnu/libkeyutils.so.1 (0x0000ffffbce20000)
<br>
libp11-kit.so.0 => /lib/aarch64-linux-gnu/libp11-kit.so.0 (0x0000ffffbcc50000)
<br>
libidn2.so.0 => /lib/aarch64-linux-gnu/libidn2.so.0 (0x0000ffffbcc10000)
<br>
libunistring.so.5 => /lib/aarch64-linux-gnu/libunistring.so.5 (0x0000ffffbca40000)
<br>
libtasn1.so.6 => /lib/aarch64-linux-gnu/libtasn1.so.6 (0x0000ffffbca00000)
<br>
libnettle.so.8 => /lib/aarch64-linux-gnu/libnettle.so.8 (0x0000ffffbc990000)
<br>
libhogweed.so.6 => /lib/aarch64-linux-gnu/libhogweed.so.6 (0x0000ffffbc920000)
<br>
libgmp.so.10 => /lib/aarch64-linux-gnu/libgmp.so.10 (0x0000ffffbc880000)
<br>
libffi.so.8 => /lib/aarch64-linux-gnu/libffi.so.8 (0x0000ffffbc850000)
</div>
<blockquote type="cite">
<div class="default-style">On 02/20/2026 8:31 AM CET Razvan Becheriu <razvan@isc.org> wrote:</div>
<div class="default-style"> </div>
<div class="default-style"> </div>
<div style="font-size: 12pt; font-family: arial, helvetica, sans-serif; direction: null; color: #000000;" data-attr="forced_root_block_attrs">
<div>please run stract -f -o outout ./kea-dhcp4 -c ... and attach the output.</div>
<div style="font-size: 12pt; font-family: arial, helvetica, sans-serif; color: #000000;" data-attr="forced_root_block_attrs"> </div>
<div style="font-size: 12pt; font-family: arial, helvetica, sans-serif; color: #000000;" data-attr="forced_root_block_attrs">(no filter on paths)Thank you,</div>
<div style="font-size: 12pt; font-family: arial, helvetica, sans-serif; color: #000000;" data-attr="forced_root_block_attrs"> </div>
<div style="font-size: 12pt; font-family: arial, helvetica, sans-serif; color: #000000;" data-attr="forced_root_block_attrs">Razvan</div>
<div>
<div id="OLK_SRC_BODY_SECTION">
<blockquote>
<hr id="MESSAGE_DATA_MARKER">
<strong>From: </strong>Razvan <razvan@isc.org>
<br>
<strong>To: </strong>Kea <kea-users@lists.isc.org>
<br>
<strong>Date: </strong>Friday, 20 February 2026 9:27 AM EET
<br>
<strong>Subject: </strong>Re: [Kea-users] kea-dhcp4 service failing to start with 'cannot open shared object file'
<br>
<br>
<div style="font-size: 12pt; font-family: 'arial' , 'helvetica' , sans-serif; color: #000000;">
<div>what is this:</div>
<div style="font-size: 12pt; font-family: 'arial' , 'helvetica' , sans-serif; color: #000000;"> </div>
<div style="font-size: 12pt; font-family: 'arial' , 'helvetica' , sans-serif; color: #000000;">
<span style="color: #000000; font-family: '-apple-system' , 'blinkmacsystemfont' , 'helvetica' , sans-serif; font-size: 14px; font-style: normal; font-weight: 400; letter-spacing: normal; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; background-color: #ffffff; text-decoration: none; display: inline !important; float: none;">HOOKS_OPEN_ERROR failed to open hook library libdhcp_ha.so: libkea-dhcpsrv.so.14</span>
</div>
<div style="font-size: 12pt; font-family: 'arial' , 'helvetica' , sans-serif; color: #000000;">
<span style="color: #000000; font-family: '-apple-system' , 'blinkmacsystemfont' , 'helvetica' , sans-serif; font-size: 14px; font-style: normal; font-weight: 400; letter-spacing: normal; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; background-color: #ffffff; text-decoration: none; display: inline !important; float: none;"> </span>
</div>
<div style="font-size: 12pt; font-family: 'arial' , 'helvetica' , sans-serif; color: #000000;">
<span style="font-family: '-apple-system' , 'blinkmacsystemfont' , 'helvetica' , sans-serif; font-size: 14px;">why does it mention </span><span style="color: #000000; font-family: '-apple-system' , 'blinkmacsystemfont' , 'helvetica' , sans-serif; font-size: 14px; font-style: normal; font-weight: 400; letter-spacing: normal; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; background-color: #ffffff; text-decoration: none; display: inline !important; float: none;">libkea-dhcpsrv.so ?</span>
</div>
<div style="font-size: 12pt; font-family: 'arial' , 'helvetica' , sans-serif; color: #000000;">
<span style="color: #000000; font-family: '-apple-system' , 'blinkmacsystemfont' , 'helvetica' , sans-serif; font-size: 14px; font-style: normal; font-weight: 400; letter-spacing: normal; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; background-color: #ffffff; text-decoration: none; display: inline !important; float: none;"> </span>
</div>
<div style="font-size: 12pt; font-family: 'arial' , 'helvetica' , sans-serif; color: #000000;">
<span style="color: #000000; font-family: '-apple-system' , 'blinkmacsystemfont' , 'helvetica' , sans-serif; font-size: 14px; font-style: normal; font-weight: 400; letter-spacing: normal; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; background-color: #ffffff; text-decoration: none; display: inline !important; float: none;"><span style="color: #000000; font-family: '-apple-system' , 'blinkmacsystemfont' , 'helvetica' , sans-serif; font-size: 14px; font-style: normal; font-weight: 400; letter-spacing: normal; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; background-color: #ffffff; text-decoration: none; display: inline !important; float: none;">ldd on this lib then</span></span>
</div>
<div id="signature-content-no-signature"></div>
<div> </div>
<div>
<div id="OLK_SRC_BODY_SECTION">
<blockquote>
<hr id="MESSAGE_DATA_MARKER">
<strong>From: </strong>duress <kea-users@lists.isc.org>
<br>
<strong>To: </strong>Kea <kea-users@lists.isc.org>
<br>
<strong>Cc: </strong>duress <duress@mailbox.org>
<br>
<strong>Date: </strong>Friday, 20 February 2026 9:18 AM EET
<br>
<strong>Subject: </strong>Re: [Kea-users] kea-dhcp4 service failing to start with 'cannot open shared object file'
<br>
<br>
<div style="font-family: '-apple-system' , 'blinkmacsystemfont' , 'helvetica' , sans-serif;">
I tried truncating the library path value to just the file base name:
<br>
<...> "library": "libdhcp_ha.so", <...>
<br>
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:
<br>
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
<br>
<br>
<br>
I don't see any issues loading dependencies for libdhcp_ha.so, and there's an error as expected for the nonexistent file.
<br>
<br>
root@diorite:/etc/kea# ldd /usr/local/lib/aarch64-linux-gnu/kea/hooks/libdhcp_ha.so
<br>
linux-vdso.so.1 (0x0000ffff83b55000)
<br>
libkea-dhcpsrv.so.145 => /usr/local/lib/aarch64-linux-gnu/libkea-dhcpsrv.so.145 (0x0000ffff83650000)
<br>
libkea-process.so.104 => /usr/local/lib/aarch64-linux-gnu/libkea-process.so.104 (0x0000ffff835e0000)
<br>
libkea-stats.so.64 => /usr/local/lib/aarch64-linux-gnu/libkea-stats.so.64 (0x0000ffff83590000)
<br>
libkea-config.so.96 => /usr/local/lib/aarch64-linux-gnu/libkea-config.so.96 (0x0000ffff834f0000)
<br>
libkea-http.so.99 => /usr/local/lib/aarch64-linux-gnu/libkea-http.so.99 (0x0000ffff833a0000)
<br>
libkea-dhcp.so.124 => /usr/local/lib/aarch64-linux-gnu/libkea-dhcp.so.124 (0x0000ffff831f0000)
<br>
libkea-hooks.so.134 => /usr/local/lib/aarch64-linux-gnu/libkea-hooks.so.134 (0x0000ffff83190000)
<br>
libkea-cc.so.95 => /usr/local/lib/aarch64-linux-gnu/libkea-cc.so.95 (0x0000ffff83110000)
<br>
libkea-asiolink.so.102 => /usr/local/lib/aarch64-linux-gnu/libkea-asiolink.so.102 (0x0000ffff83070000)
<br>
libkea-log.so.86 => /usr/local/lib/aarch64-linux-gnu/libkea-log.so.86 (0x0000ffff83020000)
<br>
libkea-util.so.116 => /usr/local/lib/aarch64-linux-gnu/libkea-util.so.116 (0x0000ffff82f80000)
<br>
libkea-exceptions.so.55 => /usr/local/lib/aarch64-linux-gnu/libkea-exceptions.so.55 (0x0000ffff82f50000)
<br>
libcrypto.so.3 => /lib/aarch64-linux-gnu/libcrypto.so.3 (0x0000ffff82ad0000)
<br>
libstdc++.so.6 => /lib/aarch64-linux-gnu/libstdc++.so.6 (0x0000ffff82840000)
<br>
libgcc_s.so.1 => /lib/aarch64-linux-gnu/libgcc_s.so.1 (0x0000ffff82800000)
<br>
libc.so.6 => /lib/aarch64-linux-gnu/libc.so.6 (0x0000ffff82640000)
<br>
/lib/ld-linux-aarch64.so.1 (0x0000ffff83b10000)
<br>
libkea-eval.so.97 => /usr/local/lib/aarch64-linux-gnu/libkea-eval.so.97 (0x0000ffff82590000)
<br>
libkea-dhcp_ddns.so.79 => /usr/local/lib/aarch64-linux-gnu/libkea-dhcp_ddns.so.79 (0x0000ffff82510000)
<br>
libkea-database.so.87 => /usr/local/lib/aarch64-linux-gnu/libkea-database.so.87 (0x0000ffff824c0000)
<br>
libkea-cryptolink.so.75 => /usr/local/lib/aarch64-linux-gnu/libkea-cryptolink.so.75 (0x0000ffff82490000)
<br>
libkea-cfgrpt.so.3 => /usr/local/lib/aarch64-linux-gnu/libkea-cfgrpt.so.3 (0x0000ffff82460000)
<br>
libssl.so.3 => /lib/aarch64-linux-gnu/libssl.so.3 (0x0000ffff82390000)
<br>
libkea-dns.so.83 => /usr/local/lib/aarch64-linux-gnu/libkea-dns.so.83 (0x0000ffff822a0000)
<br>
libkea-log-interprocess.so.4 => /usr/local/lib/aarch64-linux-gnu/libkea-log-interprocess.so.4 (0x0000ffff82270000)
<br>
liblog4cplus-2.0.so.3 => /lib/aarch64-linux-gnu/liblog4cplus-2.0.so.3 (0x0000ffff821d0000)
<br>
libm.so.6 => /lib/aarch64-linux-gnu/libm.so.6 (0x0000ffff82120000)
<div class="default-style">
<br>
root@diorite:/etc/kea# ldd /usr/local/lib/aarch64-linux-gnu/kea/hooks/libdhcp_nosuchfile.so
<br>
ldd: /usr/local/lib/aarch64-linux-gnu/kea/hooks/libdhcp_nosuchfile.so: No such file or directory
</div>
<div class="default-style" style="font-family: '-apple-system' , 'blinkmacsystemfont' , 'helvetica' , sans-serif;"> </div>
</div>
<blockquote>
<div class="default-style">On 02/20/2026 6:44 AM CET Razvan Becheriu <razvan@isc.org> wrote:</div>
<div class="default-style"> </div>
<div class="default-style"> </div>
<div style="font-size: 12pt; font-family: 'arial' , 'helvetica' , sans-serif; color: #000000;">
<div> </div>
<div id="signature-content-no-signature"></div>
<div>can you run:</div>
<div style="font-size: 12pt; font-family: 'arial' , 'helvetica' , sans-serif; color: #000000;">
<pre>ldd /usr/local/lib/aarch64-linux-gnu/kea/hooks/libdhcp_nosuchfile.so<br><br>and<br><br>ldd /usr/local/lib/aarch64-linux-gnu/kea/hooks/libdhcp_ha.so<br><br>check that all dependencies can be resolved.<br><br>Regards,<br>Razvan</pre>
<pre> </pre>
<pre><br><br><br><br><br></pre>
</div>
<div>
<div id="OLK_SRC_BODY_SECTION">
<blockquote>
<hr id="MESSAGE_DATA_MARKER">
<strong>From: </strong>Razvan <razvan@isc.org>
<br>
<strong>To: </strong>Kea <kea-users@lists.isc.org>
<br>
<strong>Date: </strong>Friday, 20 February 2026 7:37 AM EET
<br>
<strong>Subject: </strong>Re: [Kea-users] kea-dhcp4 service failing to start with 'cannot open shared object file'
<br>
<br>
<div style="font-size: 12pt; font-family: 'arial' , 'helvetica' , sans-serif; color: #000000;">
<div>Hi,</div>
<div style="font-size: 12pt; font-family: 'arial' , 'helvetica' , sans-serif; color: #000000;"> </div>
<div style="font-size: 12pt; font-family: 'arial' , 'helvetica' , sans-serif; color: #000000;">Kea can load hook libraries from default path just by specifying the hook name:</div>
<div style="font-size: 12pt; font-family: 'arial' , 'helvetica' , sans-serif; color: #000000;"> </div>
<div style="font-size: 12pt; font-family: 'arial' , 'helvetica' , sans-serif; color: #000000;">
<pre>"library": "libdhcp_nosuchfile.so"</pre>
</div>
<div id="signature-content-no-signature"></div>
<div> </div>
<div style="font-size: 12pt; font-family: 'arial' , 'helvetica' , sans-serif; color: #000000;">You can try this and see if it is any different.</div>
<div style="font-size: 12pt; font-family: 'arial' , 'helvetica' , sans-serif; color: #000000;">I'll try to replicate the issue using my rpi. Will let you know how it goes.</div>
<div style="font-size: 12pt; font-family: 'arial' , 'helvetica' , sans-serif; color: #000000;"> </div>
<div style="font-size: 12pt; font-family: 'arial' , 'helvetica' , sans-serif; color: #000000;">Regards,</div>
<div style="font-size: 12pt; font-family: 'arial' , 'helvetica' , sans-serif; color: #000000;">Razvan</div>
<div style="font-size: 12pt; font-family: 'arial' , 'helvetica' , sans-serif; color: #000000;"> </div>
<div>
<div id="OLK_SRC_BODY_SECTION">
<div id="OLK_SRC_BODY_SECTION">
<blockquote>
<hr id="MESSAGE_DATA_MARKER">
<strong>From: </strong>Andrew <kea-users@lists.isc.org>
<br>
<strong>To: </strong>kea-users <kea-users@lists.isc.org>
<br>
<strong>Cc: </strong>Andrew <duress@mailbox.org>
<br>
<strong>Date: </strong>Friday, 20 February 2026 12:34 AM EET
<br>
<strong>Subject: </strong>[Kea-users] kea-dhcp4 service failing to start with 'cannot open shared object file'
<br>
<br>
<div class="default-style">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.</div>
<div class="default-style">
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:
<br>
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
<br>
<br>
</div>
<div class="default-style">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.</div>
<div class="default-style">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.</div>
<div class="default-style">
<br>
Here's a list of the things I have tried so far to fix this issue in approximate chronological order:
</div>
<div class="default-style">
<ul>
<li>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.
<br>
<br></li>
<li>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.
<br>
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.
<br>
<br></li>
<li>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.
<br>
I addressed these by updating the apparmor profile for /usr/sbin/kea-dhcp4, which required adding explicit permits for the r and m masks.
<br>
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.
<br>
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.
<br>
<br></li>
<li>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.
<br>
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.
<br>
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.
<br>
<br></li>
<li>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.
<br>
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.
<br>
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.
<br>
Out of pure superstition, I even rebooted the server and checked again -- still present in the cache at the correct path.
<br>
<br></li>
<li>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.
<br>
<br></li>
<li>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.
<br>
<br></li>
<li>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.
<br>
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.
<br>
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.
<br>
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.</li>
</ul>
<div class="default-style" style="font-family: '-apple-system' , 'blinkmacsystemfont' , 'helvetica' , sans-serif;">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.</div>
<div class="default-style" style="font-family: '-apple-system' , 'blinkmacsystemfont' , 'helvetica' , sans-serif;"> </div>
<div class="default-style" style="font-family: '-apple-system' , 'blinkmacsystemfont' , 'helvetica' , sans-serif;">
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.
<br>
<br>
The debian packages I'm using are as follows:
<br>
ii kea-admin 2.4.1-3ubuntu0.1 arm64 Administration utilities for Kea DHCP server
<br>
ii kea-common 2.4.1-3ubuntu0.1 arm64 Common libraries for the Kea DHCP server
<br>
ii kea-dev 2.4.1-3ubuntu0.1 arm64 Development headers for Kea DHCP server
<br>
ii kea-dhcp4-server 2.4.1-3ubuntu0.1 arm64 IPv4 DHCP server
<br>
<br>
The kea version number reported by the binary that shipped with the above packages is 3.1.5
<br>
<br>
I am putting a copy of some relevant terminal buffers and config files up on my public webserver for reference, links to follow:
<br>
<br>
(config files doctored to target a nonexistent libdhcp_nosuchfile.so)
<br>
<a href="https://pdxlents.online/kea-dhcp4.conf.bad_configs.txt" target="_blank" rel="noopener">https://pdxlents.online/kea-dhcp4.conf.bad_configs.txt</a>
<br>
<a href="https://pdxlents.online/systemd_unit_file.bad_configs.txt" target="_blank" rel="noopener">https://pdxlents.online/systemd_unit_file.bad_configs.txt</a>
</div>
<div class="default-style" style="font-family: '-apple-system' , 'blinkmacsystemfont' , 'helvetica' , sans-serif;">
<a href="https://pdxlents.online/terminal_log.bad_configs.txt" target="_blank" rel="noopener">https://pdxlents.online/terminal_log.bad_configs.txt</a>
<br>
<br>
(config files targeting an actually existing libdhcp_ha.so)
</div>
<div class="default-style" style="font-family: '-apple-system' , 'blinkmacsystemfont' , 'helvetica' , sans-serif;">
<a href="https://pdxlents.online/kea-dhcp4.conf.good_configs.txt" target="_blank" rel="noopener">https://pdxlents.online/kea-dhcp4.conf.good_configs.txt</a>
<br>
<a href="https://pdxlents.online/terminal_log.good_configs.txt" target="_blank" rel="noopener">https://pdxlents.online/terminal_log.good_configs.txt</a>
</div>
<div class="default-style" style="font-family: '-apple-system' , 'blinkmacsystemfont' , 'helvetica' , sans-serif;">
<a href="https://pdxlents.online/systemd_unit_file.good_configs.txt" target="_blank" rel="noopener">https://pdxlents.online/systemd_unit_file.good_configs.txt</a>
<br>
<br>
(version output from my server binary)
</div>
<div class="default-style" style="font-family: '-apple-system' , 'blinkmacsystemfont' , 'helvetica' , sans-serif;">
<a href="https://pdxlents.online/kea-dhcp4_-V.txt" target="_blank" rel="noopener">https://pdxlents.online/kea-dhcp4_-V.txt</a>
<br>
<br>
Thanks again for reading, and for any advice or suggestions!
</div>
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