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This patch series adds load-balancing of UDP SIP based on Call-ID to
IPVS as well as a frame-work for extending IPVS to handle alternate
persistence requirements.
OVERVIEW
The approach that I have taken is what I call persistence engines.
The basic idea being that you can provide a module to LVS that alters
the way that it handles connection templates, which are at the core
of persistence. In particular, an additional key can be added, and
any of the normal IP address, port and protocol information can either
be used or ignored.
In the case of the SIP persistence engine, the only persistence engine, all
the keys used by the default persistence behaviour are used and the callid
is added as an extra key. I originally intended to ignore the cip, but this
can optionally be done by setting the persistence mask (-M) to 0.0.0.0
while allowing the flexibility of other mask values.
It is envisaged that the SIP persistence engine will be used in conjunction
with one-packet scheduling. I'm interested to hear if that doesn't fit your
needs.
CONFIGURATION
A persistence engine is associated with a virtual service
(as are schedulers). I have added the --pe option to the
ivpsadm -A and -E commands to allow the persistence engine
of a virtual service to be added, changed, or deleted.
e.g. ipvsadm -A -u 10.4.3.192:5060 -p 60 -M 0.0.0.0 -o --pe sip
There are no other configuration parameters at this time.
RUNNING
When a connection template is created, if its virtual service
has a persistence engine, then the persistence engine can add
an extra key to the connection template. For the SIP module this
is the callid. More generically, it is known as "pe data". And
both the name of the persistence engine, "pe name", and "pe data"
can be viewed in /proc/net/ip_vs_conn and by passing the
--persistent-conn option to ipvsadm -Lc.
e.g.
# ipvsadm -Lcn --persistent-conn
UDP 00:38 UDP 10.4.3.0:0 10.4.3.192:5060 127.0.0.1:5060 sip
193373839
Here we see a single persistence template (cport is 0), which has been
handled by the sip persistence engine. The pe data (callid) is 193373839.
In the case where the persistence engine can't match a packet for some
reason, the connection will fall back to the normal persistence handling.
This seems reasonable, as that if the packet ought to be dropped, iptables
could be used.
A limited amount of debugging information has been added which
can be enabled using a value of 9 or greater in
/proc/sys/net/ipv4/vs/debug_level
CODE AVAILABILITY
The kernel patches (13) are available in git as the pe-0.4 branch of
git://git.kernel.org/pub/scm/linux/kernel/git/horms/lvs-test-2.6.git
The ipvsadm patches (2) are available in git as the pe-0.4 branch of
git://github.com/horms/ipvsadm-test.git
I will post the ipvsadm patches separately
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