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Re: Question about kernel boot parameter




	Hi.

On Fri, Jun 08, 2018 at 02:05:45PM -0400, Gene Heskett wrote:
> On Friday 08 June 2018 10:44:32 Dejan Jocic wrote:
> 
> > On 08-06-18, stuv wrote:
> > > Hi everyone,
> > >
> > > I'm using a debian derivate of linux and i'm searching for a way to
> > > make permanent changes to the kernel boot parameters without GRUB or
> > > any other boot loader, i want to disable ipv6 permanently, when i do
> > > it over /init.d/modprobe.d the changes only last until the next
> > > reboot.
> > >
> > > best regards.
> >
> > man sysctl
> > man sysctl.conf
> > man sysctl.d
> >
> > and then read files /etc/sysctl.conf and files under /etc/sysctl.d/.
> > Those should give you enough examples. For your example, line you need
> > to add to some of those files, or even better new file under sysctl.d
> > with descriptive name for what will be done in it:
> >
> > net.ipv6.conf.all.disable_ipv6 = 1
> 
> This is informative, and I'll use it because my 12 machine home network 
> is all ipv4, but its for only one option. Doing "sysctl -a|wc -l" gets 
> me 829 such options to set.  So where can I find the real, complete, 
> list of options AND the effect of changing each one?

procfs(5) contains abridged list of these kernel tunables. "ip netconf"
will decypher you some more, mostly network related.

The documentation for you current kernel is the ultimate source of such
knowledge. For stock Debian kernels it resides in linux-doc* packages.

But, on that rare occasion that the option isn't there - there are kernel
sources. Your kernel won't use the tunable anyway unless it's in the source ;)

Reco