Re: Route through different gateways depending on process

Claudio Jeker <cjeker@diehard.n-r-g.com> writes:

> On Fri, Jun 21, 2019 at 02:11:53PM +0000, slackwaree wrote:
>> Hello,
>>
>> I wonder if the following scenario can be solved with OpenBSD on 1 single machine or with VMM:
>>
>> I got 3 OpenBSD vms, all of them are exactly the same running squid except they use different default routers to route their traffic out.
>>
>> I would like to merge these to one VM if it is possible somehow to tell OpenBSD to use different gateway depending on the squid process.
>>
>> If not would the same thing be possible with VMMs? All the gateways are in the same IP range.
>>
>
> A simple way to solve this is with multiple routing tables.
>
> Create multiple routing tables with:
> route -T1 add default <gw1>
> route -T2 add default <gw2>
> route -T3 add default <gw3>
>
> And start the 3 squid processes with route -T1 exec, route -T2 exec.
> You can also use the the *_rtable variable in rc.d(8) to do that
> automatically.
>
> This requires that the 3 squids listen on different IPs or ports.


As I learned recently (investigating another issue and reading the
rc.subr(8) man page), if you start these with rc scripts, you can set
daemon_rtable there, as well as likely setting up the config file or
port/ip address options in daemon_flags. Also be sure pexp variable is
set to somthing that can differentiate the proceses or the rcctl
stop/check stuff will not work.

Allan