Installing and running multiple instances of the same software

Amer amer7777 at hotmail.com
Sun Mar 13 13:15:28 UTC 2016


Thank you for this help.
As you have mentioned do these OSes in the containers can get their own IP. When I use chroot or spawn.

Best regards,
Amer

> On Mar 13, 2016, at 12:54 PM, Karl Auer <kauer at biplane.com.au> wrote:
> 
>> On Sun, 2016-03-13 at 09:58 +0100, Ralf Mardorf wrote:
>> One user can run a second instance of firefox as another user,
>> even if firefox wouldn't allow to use different profiles.
> 
> If you start it as another user, won't you will be using a different
> profile?
> 
> To the OP: The discussion starts getting a bit esoteric here. I think
> Ralf and I are agreed that you need some form of container to run your
> two Vyatta's. If the following discussion all makes sense, then you
> probably don't need our help - the pointers to the various technologies
> will be all you need.
> 
> But if the following discussion is not clear to you, your fastest (and
> probably most reliable) way forward is to use heavyweight containers -
> virtual machines or even two physical machines.
> 
> Why do you not want to use virtual machines? Why do you want two
> Vyattas on one physical machine?
> 
> Now read on:
> 
>> IIRC there is a smarter solution than to use xhost and sudo by using 
>> ssh. I guess quite recently this was a topic on this list.
> 
> Not sure what solution you are referring to here.
> 
>> IOW this could be done for every app a user could run, even if the 
>> app shouldn't allow to run several instances.
>> 
>> [rocketmouse at archlinux ~]$ grep -v "#" /usr/local/bin/chuser
> 
> Can't seem to find that on Ubuntu 15.10:
> 
> kauer at kt:~$ less /usr/local/bin/chuser
> /usr/local/bin/chuser: No such file or directory
> kauer at kt:~$ find /usr -iname "*chuser*" -print
> kauer at kt:~$ find /bin -iname "*chuser*" -print
> kauer at kt:~$ find /sbin -iname "*chuser*" -print
> kauer at kt:~$ which chuser
> kauer at kt:~$ man chuser
> No manual entry for chuser
> kauer at kt:~$ grep chuser /etc/passwd
> kauer at kt:~$ apt-cache search chuser
> kauer at kt:~$
> 
> Maybe it's an archlinux thing? If not, where do I find it?
> 
> Thanks for the info on systemd-nspawn, that was new to me. It looks
> very interesting. For this particular query though, do contained OSes
> get their own IP addresses and so forth? How does sharing of network
> interfaces (and devices more generally) work?
> 
>> Perhaps a chroot or systemd-nspawn could do the job.
> 
> chroot would not solve the shared access to devices (I think). I don't
> know whether nspawn would either. The doco for the --capability option
> suggests it might, but on the other hand (from the LXC guide):
> 
> "By default LXC creates a private network namespace for each container,
> which includes a layer 2 networking stack.  Containers usually connect
> to the outside world by either having a physical NIC or a veth tunnel
> endpoint passed into the container.  LXC creates a NATed bridge,
> lxcbr0, at host startup. Containers created using the default
> configuration will have one veth NIC with the remote end plugged into
> the lxcbr0 bridge.  A NIC can only exist in one namespace at a time, so
> a physical NIC passed into the container is not usable on the host.  
> 
> "It is possible to create a container without a private network
> namespace. In this case, the container will have access to the host
> networking like any other application.  Note that this is particularly
> dangerous if the container is running a distribution with upstart, like
> Ubuntu, since programs which talk to init, like shutdown, will talk
> over the abstract Unix domain socket to the host's upstart, and shut
> down the host."
> 
> Regards, K.
> 
> -- 
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Karl Auer (kauer at biplane.com.au)
> http://www.biplane.com.au/kauer
> http://twitter.com/kauer389
> 
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