[Kea-users] Fwd: Memory leak on dhcp6

Nitzan Tzelniker nitzan.tzelniker at gmail.com
Wed May 8 18:43:46 UTC 2019


Hi Marcin,

As far as I see in the PCAP most of the customer ask in separate packets
but I see few that ask for both in a single packet
If it will help I took a coredump during the issue

Regards

Nitzan

On Wed, May 8, 2019 at 4:51 PM Marcin Siodelski <marcin at isc.org> wrote:

> Nitzan,
>
> I just wanted to let you know that so far we were unable to reproduce
> the memory leak with duplicated server-id across the HA pair. Our test
> did not include prefix delegation, only IA_NAs. Are your clients
> requesting both address assignment and prefix delegation in the single
> transaction?
>
> Thanks,
>
> Marcin
>
> On 07/05/2019 10:49, Nitzan Tzelniker wrote:
> > Thanks for your support.
> > Unless I miss it in the logs it might also be a good idea to have error
> > message if both servers have the same server-id
> >
> > Thanks
> >
> > Nitzan
> >
> > On Tue, May 7, 2019 at 11:45 AM Marcin Siodelski <marcin at isc.org
> > <mailto:marcin at isc.org>> wrote:
> >
> >     Hello Nitzan,
> >
> >     Thank you for sharing this information. We'll try to reproduce this
> >     behavior on our end. If the problem occurs, we'll investigate and
> fix it
> >     because the duplicate server id is surely not a good reason for
> leaking
> >     memory.... ;-)
> >
> >     Marcin Siodelski
> >
> >     DHCP Software Engineer,
> >     ISC
> >
> >     On 07/05/2019 10:26, Nitzan Tzelniker wrote:
> >     > Hi,
> >     >
> >     > Just for anybody else that has this issue
> >     > The issue was that I had the same server-id on both servers as we
> >     clone
> >     > the VM of the first server after it create the server-id
> >     > I dont know why it cause memory leak.
> >     >
> >     > Thenks
> >     >
> >     > Nitzan
> >     >
> >     >
> >     > On Mon, May 6, 2019 at 6:56 PM Marcin Siodelski <marcin at isc.org
> >     <mailto:marcin at isc.org>
> >     > <mailto:marcin at isc.org <mailto:marcin at isc.org>>> wrote:
> >     >
> >     >     Hi Nitzan,
> >     >
> >     >     We're trying to reproduce this issue using our test tools. If
> >     the leak
> >     >     is related to the traffic volume processed by the server, it
> >     would be
> >     >     useful for us to know the average number of packets/second
> >     that your
> >     >     primary server is receiving.
> >     >
> >     >     You say that the memory consumption grows to 28% within an
> >     hour but I
> >     >     don't know how many packets the server has received and
> >     processed to
> >     >     reach that level. If you can provide the average DHCP traffic
> >     rate we
> >     >     can craft the test that best mirrors your situation and
> >     confirm whether
> >     >     or not we see the same thing.
> >     >
> >     >     Thanks in advance,
> >     >
> >     >     Marcin Siodelski
> >     >     DHCP Software Engineer,
> >     >     ISC
> >     >
> >     >     On 05/05/2019 16:29, Nitzan Tzelniker wrote:
> >     >     > Hi,
> >     >     >
> >     >     > It seems that the issue is related to the HA
> >     >     > After I commented the HA part the memory consumption is
> >     stayed low
> >     >     > I am adding the relevant configuration if you have any idea
> >     >     >
> >     >     > Thanks
> >     >     >
> >     >     > Nitzan
> >     >     >
> >     >     > Standby server ha configuration part:
> >     >     >
> >     >     >     "hooks-libraries": [
> >     >     >         {
> >     >     >             "library":
> >     "/usr/local/lib/hooks/libdhcp_lease_cmds.so",
> >     >     >             "parameters": { }
> >     >     >         },
> >     >     >         {
> >     >     >             "library": "/usr/local/lib/hooks/libdhcp_ha.so",
> >     >     >             "parameters": {
> >     >     >                 "high-availability": [ {
> >     >     >                     "this-server-name": "KEA_DHCPv6_2",
> >     >     >                     "mode": "hot-standby",
> >     >     >                     "heartbeat-delay": 10000,
> >     >     >                     "max-response-delay": 20000,
> >     >     >                     "max-ack-delay": 10000,
> >     >     >                     "max-unacked-clients": 0,
> >     >     >                     "peers": [
> >     >     >                         {
> >     >     >                             "name": "KEA_DHCPv6_1",
> >     >     >                             "role": "primary",
> >     >     >                             "auto-failover": true
> >     >     >                         },
> >     >     >                         {
> >     >     >                             "name": "KEA_DHCPv6_2",
> >     >     >                             "role": "standby",
> >     >     >                             "auto-failover": true
> >     >     >                         }
> >     >     >                     ]
> >     >     >                 } ]
> >     >     >             }
> >     >     >         }
> >     >     >     ]
> >     >     > }
> >     >     >
> >     >     > kea-ctrl-agent.conf  from both servers (Only the ip address
> is
> >     >     different )
> >     >     >
> >     >     > {
> >     >     >
> >     >     > "Control-agent": {
> >     >     >     "http-host": "1.1.1.X",
> >     >     >     "http-port": 8080,
> >     >     >
> >     >     >     "control-sockets": {
> >     >     >         "dhcp4": {
> >     >     >             "socket-type": "unix",
> >     >     >             "socket-name": "/tmp/kea-dhcp4-ctrl.sock"
> >     >     >         },
> >     >     >         "dhcp6": {
> >     >     >             "socket-type": "unix",
> >     >     >             "socket-name": "/tmp/kea-dhcp6-ctrl.sock"
> >     >     >         }
> >     >     >     },
> >     >     >
> >     >     >     "hooks-libraries": [
> >     >     >     ]
> >     >     > },
> >     >     >
> >     >     > "Logging":
> >     >     > {
> >     >     >   "loggers": [
> >     >     >     {
> >     >     >         "name": "kea-ctrl-agent",
> >     >     >         "output_options": [
> >     >     >             {
> >     >     >                 "output":
> >     "/usr/local/var/log/kea-ctrl-agent.log"
> >     >     >             }
> >     >     >         ],
> >     >     >         "severity": "INFO",
> >     >     >
> >     >     >         "debuglevel": 0
> >     >     >     }
> >     >     >   ]
> >     >     > }
> >     >     > }
> >     >     > ---------- Forwarded message ---------
> >     >     > From: *Nitzan Tzelniker* <nitzan.tzelniker at gmail.com
> >     <mailto:nitzan.tzelniker at gmail.com>
> >     >     <mailto:nitzan.tzelniker at gmail.com
> >     <mailto:nitzan.tzelniker at gmail.com>>
> >     >     > <mailto:nitzan.tzelniker at gmail.com
> >     <mailto:nitzan.tzelniker at gmail.com>
> >     >     <mailto:nitzan.tzelniker at gmail.com
> >     <mailto:nitzan.tzelniker at gmail.com>>>>
> >     >     > Date: Fri, May 3, 2019 at 10:13 PM
> >     >     > Subject: Memory leak on dhcp6
> >     >     > To: <kea-users at lists.isc.org
> >     <mailto:kea-users at lists.isc.org> <mailto:kea-users at lists.isc.org
> >     <mailto:kea-users at lists.isc.org>>
> >     >     <mailto:kea-users at lists.isc.org
> >     <mailto:kea-users at lists.isc.org> <mailto:kea-users at lists.isc.org
> >     <mailto:kea-users at lists.isc.org>>>>
> >     >     >
> >     >     >
> >     >     > Hi,
> >     >     >
> >     >     > I am running two dhcpv6 server with high-availability
> >     >     > We have about 2500 regular leases and 2500 PD leases
> >     >     > The setup is working but it look like kea-dhcp6 leak memory
> >     >     > When it start (with all of the leases in the file ) it take
> less
> >     >     then 1%
> >     >     > of the memory but after two hours it take 28% and if I will
> >     give it 8
> >     >     > hours it will crash
> >     >     >
> >     >     > I don't see issue on the standby server only on the primary
> >     server
> >     >     >
> >     >     > Anybody saw this behavior
> >     >     > Any idea how to debug it
> >     >     >
> >     >     >  kea-dhcp6 -V
> >     >     > 1.5.0
> >     >     > tarball
> >     >     > linked with:
> >     >     > log4cplus 1.1.3
> >     >     > OpenSSL 1.0.2k-fips  26 Jan 2017
> >     >     > database:
> >     >     > Memfile backend 2.1
> >     >     >
> >     >     > Running on CentOS 7.6.1810 VM kernel 3.10.0-957.1.3.el7.x86
> >     with 2 *
> >     >     > vCPU and 2GB RAM
> >     >     >
> >     >     > bellow is the dhcp6 config file omitting 102 subsets
> >     >     >
> >     >     > {
> >     >     > "Dhcp6": {
> >     >     >     "interfaces-config": {
> >     >     >         "interfaces": [ "ens192/1111:aef:aa77:83::100" ]
> >     >     >     },
> >     >     >     "mac-sources": [ "docsis-cmts",
> "client-link-addr-option" ],
> >     >     >
> >     >     >     "control-socket": {
> >     >     >         "socket-type": "unix",
> >     >     >         "socket-name": "/tmp/kea-dhcp6-ctrl.sock"
> >     >     >     },
> >     >     >
> >     >     >     "lease-database": {
> >     >     >         "type": "memfile",
> >     >     >         "lfc-interval": 3600
> >     >     >     },
> >     >     >     "expired-leases-processing": {
> >     >     >         "reclaim-timer-wait-time": 10,
> >     >     >         "flush-reclaimed-timer-wait-time": 25,
> >     >     >         "hold-reclaimed-time": 3600,
> >     >     >         "max-reclaim-leases": 100,
> >     >     >         "max-reclaim-time": 250,
> >     >     >         "unwarned-reclaim-cycles": 5
> >     >     >     },
> >     >     >
> >     >     >     "renew-timer": 1000,
> >     >     >     "rebind-timer": 2000,
> >     >     >     "preferred-lifetime": 3000,
> >     >     >     "valid-lifetime": 4000,
> >     >     >     "option-data": [
> >     >     >         {
> >     >     >             "name": "dns-servers",
> >     >     >             "data": "1111:aef:aa77:1::22,
> 1111:aef:aa77:2::22"
> >     >     >         }
> >     >     >     ],
> >     >     >     "subnet6": [
> >     >     >         {
> >     >     >             "subnet": "1111:aec:0:10::/64",
> >     >     >             "pools": [ { "pool":
> >     >     > "1111:aec:0:10::10-1111:aec:0:10:ffff::" } ],
> >     >     >             "pd-pools": [
> >     >     >                 {
> >     >     >                     "prefix": "1111:aec:10::",
> >     >     >                     "prefix-len": 44,
> >     >     >                     "delegated-len": 56
> >     >     >                 }
> >     >     >             ]
> >     >     >         },
> >     >     > //....
> >     >     > //  101 more subnets
> >     >     > //....
> >     >     >  "hooks-libraries": [
> >     >     >         {
> >     >     >             "library": "/usr/local/lib/hooks/libdhcp_ha.so",
> >     >     >             "parameters": {
> >     >     >                 "high-availability": [ {
> >     >     >                     "this-server-name": "KEA_DHCPv6_1",
> >     >     >                     "mode": "hot-standby",
> >     >     >                     "heartbeat-delay": 10000,
> >     >     >                     "max-response-delay": 20000,
> >     >     >                     "max-ack-delay": 10000,
> >     >     >                     "max-unacked-clients": 0,
> >     >     >                     "peers": [
> >     >     >                         {
> >     >     >                             "name": "KEA_DHCPv6_1",
> >     >     >                             "role": "primary",
> >     >     >                             "auto-failover": true
> >     >     >                         },
> >     >     >                         {
> >     >     >                             "name": "KEA_DHCPv6_2",
> >     >     >                             "role": "standby",
> >     >     >                             "auto-failover": true
> >     >     >                         }
> >     >     >                     ]
> >     >     >                 } ]
> >     >     >             }
> >     >     >         }
> >     >     >     ]
> >     >     > },
> >     >     >
> >     >     > "Logging":
> >     >     > {
> >     >     >   "loggers": [
> >     >     >     {
> >     >     >         "name": "kea-dhcp6",
> >     >     >         "output_options": [
> >     >     >             {
> >     >     >                 "output": "/usr/local/var/log/kea-dhcp6.log"
> >     >     >             }
> >     >     >         ],
> >     >     >         "severity": "INFO",
> >     >     >
> >     >     >         "debuglevel": 0
> >     >     >     }
> >     >     >   ]
> >     >     > }
> >     >     > }
> >     >     > Thanks
> >     >     >
> >     >     > Nitzan
> >     >     >
> >     >     > _______________________________________________
> >     >     > Kea-users mailing list
> >     >     > Kea-users at lists.isc.org <mailto:Kea-users at lists.isc.org>
> >     <mailto:Kea-users at lists.isc.org <mailto:Kea-users at lists.isc.org>>
> >     >     > https://lists.isc.org/mailman/listinfo/kea-users
> >     >     >
> >     >
> >
>
>
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