multiple interfaces for jail.conf(1) and jail_set(2)

[Isaac (.ike) Levy]

Wow, that’s rad Michael,

> On Dec 14, 2016, at 3:30 PM, Michael Grimm <trashcan at ellael.org> wrote:
> 
> Isaac (.ike) Levy <ike at blackskyresearch.net> wrote:
> 
>> Can I specify multiple IP interfaces and assign IP’s to them using jail.conf?
> 
> Not sure if I understand your question correctly, but I do define the following in my jail.conf for VNET jails:
> 
> #
> # host dependent global settings
> #
> $ip6prefixLOCAL		 = "fd00:dead:beef:1234";
> 
> #
> # global jail settings
> #
> host.hostname		 = "${name}";
> path			 = "/usr/home/jails/${name}";
> mount.fstab		 = "/etc/fstab.${name}";
> exec.consolelog 	 = "/var/log/jail_${name}_console.log";
> vnet			 = "new";
> vnet.interface		 = "epair${jailID}b";
> exec.clean;
> mount.devfs;
> persist;
> 
> #
> # network settings to apply/destroy during start/stop of every jail
> #
> exec.prestart		 = "sleep 2";
> exec.prestart		+= "/sbin/ifconfig epair${jailID} create up";
> exec.prestart		+= "/sbin/ifconfig bridge0 addm epair${jailID}a";
> exec.start		 = "/sbin/sysctl net.inet6.ip6.dad_count=0";
> exec.start		+= "/sbin/ifconfig lo0 127.0.0.1 up";
> exec.start		+= "/sbin/ifconfig epair${jailID}b inet ${ip4_addr}";
> exec.start		+= "/sbin/ifconfig epair${jailID}b inet6 ${ip6_addr}";
> exec.start		+= "/sbin/route add default -gateway 10.1.1.254";
> exec.start		+= "/sbin/route add -inet6 default -gateway ${ip6prefixLOCAL}::254";
> exec.stop		 = "/sbin/route del default";
> exec.stop		+= "/sbin/route del -inet6 default";
> exec.stop		+= "/bin/sh /etc/rc.shutdown";
> exec.poststop 		 = "/sbin/ifconfig epair${jailID}a destroy";
> 
> #
> # individual jail settings
> #
> dns {
> 	$jailID		 = 1;
> 	$ip4_addr	 = 10.1.1.1;
> 	$ip4_addr_2	 = 10.1.1.2;
> 	$ip6_addr	 = ${ip6prefixLOCAL}::1/64;
> 	$ip6_addr_2	 = ${ip6prefixLOCAL}::2/64;
> 	exec.start	+= "/sbin/ifconfig epair${jailID}b inet  ${ip4_addr_2} alias";
> 	exec.start	+= "/sbin/ifconfig epair${jailID}b inet6 ${ip6_addr_2} alias";
> 	exec.start	+= "/bin/sh /etc/rc";
> }
> 
> etc.

I’ll need to study/look up some of that syntax, to fully grok this, but that comprehensive example appears to hit the nail on the head several times over with the exec.start/exec.stop action.

Two questions though:

- I’m confused how you define the shell style $ variables in your individual jail settings above, e.g. ‘$ip4_addr_2 = 10.1.1.2;’, why/how does that work?  Is that a variable to be expanded, or some other behavior?

> Again, not sure if I do understand your issue correctly, but the shown examples of exec.start, exec.stop, etc. are quite versatile to use.
> 
> I do start/stop my jails by "service jail start/stop”.

- Obviously you state you’re using service to start/stop jails, but shouldn’t this work with ‘jail -c <jailname>’, or are these subsystems not interoperable?

Thanks!

Best,
.ike



> 
> Hope that helps,
> Michael
> 
> 
> 
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