I'm very new to snappy so please excuse me for any questions that seem obvious.
I have snapcraft.yaml that looks as follows:
--------------------------------------------------------------------------------------------------------------------------------------------
% cat snapcraft.yaml
name: openswitch-appliance
version: 0.3.0-rc0-1
summary: OpenSwitch NOS for the Appliance.
description: A standalone version of the OpenSwitch NOS (www.openswitch.net)
Appliance targeted at an Oracle VirtualBox running Ubuntu-Core with one
management interface and seven "front-panel" network adapters.
confinement: devmode
apps:
start-openswitch:
command: usr/sbin/start-openswitch
plugs: [ network, network-control, network-bind, network-manager,
network-observe, gsettings ]
stop-openswitch:
command: usr/sbin/stop-openswitch
plugs: [ network, network-control, network-bind, network-manager,
network-observe, gsettings ]
vtysh:
command: usr/sbin/start-vtysh
shell:
command: bin/bash
plugs: [ network, network-control, network-bind, network-manager,
network-observe, gsettings ]
parts:
ops-init:
plugin: make
source: src/ops-init
stage-packages: [ binutils, file, strace, bash, iputils-ping, traceroute ]
openswitch:
plugin: x-openswitch
# source: https://github.com/ops-snappy/ops-build.git
# source: ../ops-build
source: /builds/dgarrod/ops-build
platform: appliance
# skip-native-build: true
skip-native-build: true
stage-packages: [ resolvconf ]
after: [ ops-init ]
--------------------------------------------------------------------------------------------------------------------------------------------
The important point here is that there are multiple commands that are part of
the snap. I start our snap using the command:
sudo /snap/bin/openswitch-appliance.start-openswitch
Inside the SNAP this creates a couple of namespaces (swns and nonet):
/sbin/ip netns add swns
/sbin/ip netns add nonet
The problem is that if I then start up another command in the SNAP,
specifically a bash shell using:
sudo /snap/bin/openswitch-appliance.bash
I can't get at the swns or nonet namespaces from the bash shell that gets
started. I get errors like:
root@Snappy-Appliance:/home/netop# ip netns exec swns bash
RTNETLINK answers: Invalid argument
RTNETLINK answers: Invalid argument
setting the network namespace "swns" failed: Invalid argument
root@Snappy-Appliance:/home/netop# ip netns pids swns
RTNETLINK answers: Invalid argument
RTNETLINK answers: Invalid argument
Why is this? I thought all commands for my "snap" are somehow part of the same
"snap", even though they are in different process trees. It apparently isn't
the case. How do I get namespaces to play across these commands.
Note that currently I'm installing my SNAP --devmode and I'm also connecting
all the network related plug/slots.
sudo snap connect openswitch-appliance:network-control
ubuntu-core:network-control
sudo snap connect openswitch-appliance:network-manager
ubuntu-core:network-manager
sudo snap connect openswitch-appliance:network-observe
ubuntu-core:network-observe
The only way I've sort of worked around this is to start up a "bash" shell
using my snap bash command and then actually starting my subsystem from within
this bash shell. So now all processes only went through the one "command". But
for a number of reasons this isn't going to work for me.
Another way of asking my questions is how do I get all my "apps" in my SNAP to
be able to play nicely together? Are they one "snap" or not, even when started
separately?
Thanks,
Dave Garrod
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