Enough late posts for a lack of activity on this, this time I think we
can close it :-)
What used to be:
ExecStartPre=/usr/sbin/dnsmasq --test
Nowadays is:
ExecStartPre=/etc/init.d/dnsmasq checkconfig
that maps it to
${DAEMON} --test ${CONFIG_DIR:+ -7 ${CONFIG_DIR}} ${DNSMASQ_OPTS:+
${DNSMASQ_OPTS}} >/dev/null 2>&1
Which includes not only config-dir but also all other configs that might
affect it.
It is not yet started as After=systemd-resolved.service but tolerates both
modes nowadays.
1. with systemd-resolved stopped
● dnsmasq.service - dnsmasq - A lightweight DHCP and caching DNS server
Loaded: loaded (/lib/systemd/system/dnsmasq.service; enabled; vendor
preset: enabled)
Active: active (running) since Wed 2021-11-17 15:49:59 UTC; 5s ago
Process: 29898 ExecStartPre=/etc/init.d/dnsmasq checkconfig (code=exited,
status=0/SUCCESS)
Process: 29906 ExecStart=/etc/init.d/dnsmasq systemd-exec (code=exited,
status=0/SUCCESS)
Process: 29915 ExecStartPost=/etc/init.d/dnsmasq systemd-start-resolvconf
(code=exited, status=0/SUCCESS)
Main PID: 29914 (dnsmasq)
Tasks: 1 (limit: 38266)
Memory: 2.0M
CGroup: /system.slice/dnsmasq.service
└─29914 /usr/sbin/dnsmasq -x /run/dnsmasq/dnsmasq.pid -u dnsmasq
-7 /etc/dnsmasq.d,.dpkg-dist,.dpkg-old,.dpkg-new --local-service
--trust-anchor=.,20326,8,2,e06d44b80b8f1d39a95c>
Nov 17 15:49:59 j systemd[1]: Starting dnsmasq - A lightweight DHCP and caching
DNS server...
Nov 17 15:49:59 j dnsmasq[29914]: started, version 2.85 cachesize 150
Nov 17 15:49:59 j dnsmasq[29914]: DNS service limited to local subnets
Nov 17 15:49:59 j dnsmasq[29914]: compile time options: IPv6 GNU-getopt DBus
no-UBus i18n IDN2 DHCP DHCPv6 no-Lua TFTP conntrack ipset auth cryptohash
DNSSEC loop-detect inotify dumpfile
Nov 17 15:49:59 j dnsmasq[29914]: reading /etc/resolv.conf
Nov 17 15:49:59 j dnsmasq[29914]: using nameserver 127.0.0.53#53
Nov 17 15:49:59 j dnsmasq[29914]: read /etc/hosts - 7 addresses
Nov 17 15:49:59 j systemd[1]: Started dnsmasq - A lightweight DHCP and caching
DNS server.
2. with systemd-resolved stopped and /etc/resolv.conf removed
● dnsmasq.service - dnsmasq - A lightweight DHCP and caching DNS server
Loaded: loaded (/lib/systemd/system/dnsmasq.service; enabled; vendor
preset: enabled)
Active: active (running) since Wed 2021-11-17 15:50:41 UTC; 3s ago
Process: 29937 ExecStartPre=/etc/init.d/dnsmasq checkconfig (code=exited,
status=0/SUCCESS)
Process: 29945 ExecStart=/etc/init.d/dnsmasq systemd-exec (code=exited,
status=0/SUCCESS)
Process: 29954 ExecStartPost=/etc/init.d/dnsmasq systemd-start-resolvconf
(code=exited, status=0/SUCCESS)
Main PID: 29953 (dnsmasq)
Tasks: 1 (limit: 38266)
Memory: 1.8M
CGroup: /system.slice/dnsmasq.service
└─29953 /usr/sbin/dnsmasq -x /run/dnsmasq/dnsmasq.pid -u dnsmasq
-7 /etc/dnsmasq.d,.dpkg-dist,.dpkg-old,.dpkg-new --local-service
--trust-anchor=.,20326,8,2,e06d44b80b8f1d39a95c>
Nov 17 15:50:41 j systemd[1]: Starting dnsmasq - A lightweight DHCP and caching
DNS server...
Nov 17 15:50:41 j dnsmasq[29953]: started, version 2.85 cachesize 150
Nov 17 15:50:41 j dnsmasq[29953]: DNS service limited to local subnets
Nov 17 15:50:41 j dnsmasq[29953]: compile time options: IPv6 GNU-getopt DBus
no-UBus i18n IDN2 DHCP DHCPv6 no-Lua TFTP conntrack ipset auth cryptohash
DNSSEC loop-detect inotify dumpfile
Nov 17 15:50:41 j dnsmasq[29953]: read /etc/hosts - 7 addresses
Nov 17 15:50:41 j systemd[1]: Started dnsmasq - A lightweight DHCP and caching
DNS server.
In none of these modes it gets stuck and I'm unsure if adding the After
nowadays would really be right. Even if so as I explained in the past that
should go through a report to the Debian bug tracker as the issue is not Ubuntu
specific in this case and we'd like to fix both.
---
Backports of this change are unlikely to qualify for the SRU process [1]
as the rework of the init scripts can have plenty of side effects that
might break existing users.
So the check it runs in ExecStartPre might be useless, but only if it
would really break people (and I've not seen reports other than this
one, so it might not be that common of a problem at all) it might
justify the risk of changing that. It is valid for a backport, but IMHO
low prio and probably not done unless somebody speaks up outlining why
this is more severe than it seems.
Bionic is still affected, I'm marking this as such.
[1]: https://wiki.ubuntu.com/StableReleaseUpdates
** Also affects: dnsmasq (Ubuntu Bionic)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1639452
Title:
systemd ExecStartPre test config
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