hi, Am Freitag, den 20.01.2017, 15:33 +0100 schrieb Luca Dionisi: > > Since my "thingy" is going to sport an experimental routing protocol, > I need > to change some files on the fly. For instance /etc/iproute/rt_tables. > Which > I already see that is not writeable in my Ubuntu Core install. > > Also I am going to use some commands that I haven't yet tested on > Ubuntu > Core. Mostly "ip" and "iptables", also in non-default network > namespaces. > And I don't know if they need internally write-access to some file. > > Do you see anything about it that would be infeasible in a Ubuntu > Core as > it currently stands? > > If not, what is my next step? Will I need to build a custom Ubuntu > Core > image? While testing, would I be able to remount the current image > file > system in read-write? > you would not be able to mount the current rootfs in read-write, since it is a squashfs file.
for the above features you require ubuntu-core typically offers
interfaces that a snap can use to control specific parts of the system
[1]. i assume your goal is to have some app that can manage firewall,
routing and other networking aspects.
my first step here would be to use the default ubuntu-core image and
start working on a snap you can install on top of it that uses the
existing interfaces. also take a look at the source of existing snaps
for inspiration i.e. there is a "ufw" snap that does firewalling that
should show how you can be able to manipulate iptables with
thefirewall-control interface.
every time you hit a roadblock you file a bug and ask for extension of
the interface or for a new interface to be added (and indeed we also
accept patches if you already have an idea for a solution ;) ).
eventually you will end up with the system you desire.
snappy is a new approach so things you are used to from existing deb
based systems might work in different ways (like: you wont
make /etc/iproute/rt_tables writable but instead use the network-
control interface to manipulate the routing table).
ciao
oli
[1] http://snapcraft.io/docs/reference/interfaces
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