[lvs-users] DTLS Load balancing

Julian Anastasov ja at ssi.bg
Wed Nov 1 20:17:56 GMT 2017


On Tue, 31 Oct 2017, Simon Bernard wrote:

> Thx a lot Julian for this accurate response.
> Just to let you know, this is a mid/long term idea, but more I think about it
> more I like it.
> CID is still a draft. Before to go to the LVS implementation we need to have
> DTLS implementation which support DTLS CID.
> All of this is really new for me. I have some questions before to start.
> (newbie's questions :p)
> If I well understand IPVS  is a module of the linux kernel.

	Yes, there is a core module (ip_vs), modules for schedulers,
for apps (ip_vs_ftp), persistence engines (ip_vs_pe_sip).

> So the source code is directly available in the kernel repository [1] ?

	Yes but you can also use latest kernel from:


	You can also read some files from the kernel sources:

# When coding:
# How to send patches in raw form:
# The final patch should be sent to addresses specified with
# 'M' and 'L' for 'IPVS' here:

	Knowing 'git' to create a patch is not required,
using such command to create your patch should be enough:

diff -urpN linux.orig linux

For user-space tool:

# get fresh ipvsadm sources:
git clone git://git.kernel.org/pub/scm/utils/kernel/ipvsadm/ipvsadm.git

to use --pe dtls

> I should use ip_vs_pe_sip.c[2] as sample ?

	Yes. But more changes can be needed.

> I looked at internet resource for kernel development there is a lot !  Linux
> Kernel Newbies[1] seems good. Any advice about how to tests my code ? Are you
> using virtualization or something like that ?

	Yes, you can use such software. But initially you can
start with local real server and local client. IPVS supports all
4 cases:

1. local client + local real server
2. local client + remote real server (NAT)
3. remote client + local real server
4. remote client + remote real server

> Thx again for you time.
> [1]
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/net/netfilter/ipvs 
> [2]
> https://github.com/torvalds/linux/blob/master/net/netfilter/ipvs/ip_vs_pe_sip.c
> [3] https://kernelnewbies.org/FirstKernelPatch


Julian Anastasov <ja at ssi.bg>

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