Re: Dnsmasq on Debian jessie

On Thursday, 24 March 2016 14:47:07 UTC, Kevin Philp wrote:
>
> I am having some issues with dnsmasq on Jessie. I won't start under 
> systemd, so 
>
> systemctl start dnsmasq
>
> Starts the service and it works..briefly but the command takes about two 
> minutes to return and returns:
>
> Job for dnsmasq.service failed. See 'systemctl status dnsmasq.service' and 
> 'journalctl -xn' for details.
>
> systemctl status dnsmasq now says
>
> root@ccserver:/home/kevinphilp# systemctl status dnsmasq
> ● dnsmasq.service - dnsmasq - A lightweight DHCP and caching DNS server
>    Loaded: loaded (/lib/systemd/system/dnsmasq.service; enabled)
>   Drop-In: /run/systemd/generator/dnsmasq.service.d
>            └─50-dnsmasq-$named.conf, 50-insserv.conf-$named.conf
>    Active: failed (Result: timeout) since Thu 2016-03-24 14:40:40 GMT; 
> 2min 24s ago
>   Process: 21873 ExecStop=/etc/init.d/dnsmasq systemd-stop-resolvconf 
> (code=killed, signal=TERM)
>   Process: 21657 ExecStart=/etc/init.d/dnsmasq systemd-exec (code=exited, 
> status=0/SUCCESS)
>   Process: 21655 ExecStartPre=/usr/sbin/dnsmasq --test (code=exited, 
> status=0/SUCCESS)
>  Main PID: 21665 (code=exited, status=0/SUCCESS)
>
> Mar 24 14:37:40 ccserver dnsmasq[21665]: compile time options: IPv6 
> GNU-getopt DBus i18n IDN DHCP DHCPv6 no-Lua TFTP conntrack ips...-detect
> Mar 24 14:37:40 ccserver dnsmasq-dhcp[21665]: DHCP, IP range 
> 192.168.100.100 -- 192.168.100.150, lease time 12h
> Mar 24 14:37:40 ccserver dnsmasq[21665]: using nameserver 159.134.0.2#53
> Mar 24 14:37:40 ccserver dnsmasq[21665]: using nameserver 159.134.0.1#53
> Mar 24 14:37:40 ccserver dnsmasq[21665]: read /etc/hosts - 12 addresses
> Mar 24 14:39:10 ccserver systemd[1]: dnsmasq.service start-post operation 
> timed out. Stopping.
> Mar 24 14:40:40 ccserver systemd[1]: dnsmasq.service stopping timed out. 
> Terminating.
> Mar 24 14:40:40 ccserver dnsmasq[21665]: exiting on receipt of SIGTERM
> Mar 24 14:40:40 ccserver systemd[1]: Failed to start dnsmasq - A 
> lightweight DHCP and caching DNS server.
> Mar 24 14:40:40 ccserver systemd[1]: Unit dnsmasq.service entered failed 
> state.
> Hint: Some lines were ellipsized, use -l to show in full.
>
> I can start dnsmasq maually without systemd and it works with no problems.
>
> I have looked through the bug reports but no clear fix.
>
> Any thoughts welcome.
>
> Thanks
>
> Kevin.
>


After a bit of digging into the files it looks like an issue with 
resolvconf. The systemd init script says:

[Unit]
Description=dnsmasq - A lightweight DHCP and caching DNS server

# KP
Requires=network.target

[Service]
Type=forking
PIDFile=/var/run/dnsmasq/dnsmasq.pid

# Test the config file and refuse starting if it is not valid.
ExecStartPre=/usr/sbin/dnsmasq --test

# We run dnsmasq via the /etc/init.d/dnsmasq script which acts as a
# wrapper picking up extra configuration files and then execs dnsmasq
# itself, when called with the "systemd-exec" function.
ExecStart=/etc/init.d/dnsmasq systemd-exec

# The systemd-*-resolvconf functions configure (and deconfigure)
# resolvconf to work with the dnsmasq DNS server. They're called liek
# this to get correct error handling (ie don't start-resolvconf if the 
# dnsmasq daemon fails to start.
ExecStartPost=/etc/init.d/dnsmasq systemd-start-resolvconf
ExecStop=/etc/init.d/dnsmasq systemd-stop-resolvconf


ExecReload=/bin/kill -HUP $MAINPID

[Install]
WantedBy=multi-user.target

If I comment out the lines

ExecStartPost=/etc/init.d/dnsmasq systemd-start-resolvconf
ExecStop=/etc/init.d/dnsmasq systemd-stop-resolvconf

Everything works. Maybe the problem was related to us switching off 
resolvconf polling in the config file?


 

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