[Kea-users] DHCPSRV_NO_SOCKETS_OPEN problem

[Stephen Berg, Code 7309]

I just figured out that although dnsmasq is disabled according to 
systemd something is starting it at boot time.  I think libvirtd or 
gnome-boxes.  Removed those and kea now starts up as expected.

On 2/18/2022 8:58 AM, Dan Oachs wrote:
> I am running kea 2.0.1 on Rocky Linux 8.5.
>
> My interfaces option is set to:
>       "interfaces": ["eth0"]
>
> And I have ip helper addresses set for all the vlans to point dhcp 
> traffic to this server.
>
> Are you 100% sure there is not some other process or dhcp server 
> listening on port 67 on your server?
>
> I also have a second kea 2.0.1 server ( setup in HA mode with this 
> server). The second server has an interface on each vlan so it can get 
> the dhcp requests directly and not need them forwarded from the router.
>
> On this server the interfaces option looks like this:
>        "interfaces": ["*"]
>
>
> --Dan
>
>
> On Fri, Feb 18, 2022 at 8:33 AM Stephen Berg, Code 7309 via Kea-users 
> <kea-users at lists.isc.org> wrote:
>
>     I'm evaluating kea 1.8 to eventually integrate into my network. I've
>     got 6 subnets that I'll be managing eventually.  Relay agents will
>     be on
>     all but one subnet. An initial install and test setup with mysql
>     backend
>     went okay but I have one show stopper problem now.
>
>     Whenever I start the service I see in the log:
>     DHCPSRV_OPEN_SOCKET_FAIL failed to open socket: failed to open
>     socket on
>     interface eth0, reason: failed to bind fallback socket to address
>     <serverIP>, port 67, reason: Address already in use - is another DHCP
>     server running?
>     2022-02-18 08:23:27.547 WARN [kea-dhcp4.dhcpsrv/3416.140158564502848]
>     DHCPSRV_NO_SOCKETS_OPEN no interface configured to listen to DHCP
>     traffic
>
>     I changed dhcp-socket-type to udp to see if that would change the
>     behavior and got this:
>     2022-02-18 08:14:13.653 WARN [kea-dhcp4.dhcpsrv/3218.139637232491840]
>     DHCPSRV_OPEN_SOCKET_FAIL failed to open socket: failed to open
>     socket on
>     interface eth0, reason: Failed to bind socket 15 to <serverIP>/port=67
>     2022-02-18 08:14:13.653 WARN [kea-dhcp4.dhcpsrv/3218.139637232491840]
>     DHCPSRV_NO_SOCKETS_OPEN no interface configured to listen to DHCP
>     traffic
>
>     This is running on a virtual machine, rocky linux 8.5. Selinux and
>     firewall have been disabled for testing.  Network seems fine on the
>     system other than this.  My initial config is just a couple of
>     reserved
>     address based on mac address and no pool.  If I can get this
>     working I
>     plan to add reservations for all clients in each of the subnets.
>
>     -- 
>     Stephen Berg, IT Specialist, Ocean Sciences Division, Code 7309
>     Naval Research Laboratory
>     W:   (228) 688-5738
>     DSN: (312) 823-5738
>     C:   (228) 365-0162
>     Email: stephen.berg at nrlssc.navy.mil <- (Preferred contact)
>     Flank Speed: stephen.p.berg.civ at us.navy.mil
>
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-- 
Stephen Berg, IT Specialist, Ocean Sciences Division, Code 7309
Naval Research Laboratory
W:   (228) 688-5738
DSN: (312) 823-5738
C:   (228) 365-0162
Email:stephen.berg at nrlssc.navy.mil   <- (Preferred contact)
Flank Speed:stephen.p.berg.civ at us.navy.mil
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