[asterisk-users] Recommendations for free virtual server tech and Asterisk?

[Tzafrir Cohen]

On Sat, Apr 09, 2016 at 08:13:29PM +0700, Ikka Tirtawidjaja wrote:
> https://sysadminman.net/blog/2011/asterisk-virtualization-openvz-or-vmware-3004
> 
> 
> OpenVZ provides operating system-level virtualization where the underlying
> hardware runs a kernel that is shared by all of the virtual machines.
> 
> Where OpenVZ gets a bad name is that it’s very easy to provision many more
> VPSs on a physical server than that server can really handle. This means
> lots of virtual machines all trying to use the CPU, ram, network etc on the
> underlying server, resulting in bottlenecks. This might not be a problem on
> a webserver. If a web server takes half a second longer to display a web
> page because the server is overloaded then maybe nobody will notice.
> However, if your VOIP packets are delayed for half a second then you will
> definitely notice!
> 
> Probably the most crucial fact about running Asterisk on a VPS though is
> who you are sharing the underlying hardware with, and how well the server
> is managed. Even if there are only a few other virtual servers on that
> server and they are allowed to abuse the resources available then you will
> likely get a bad VOIP experience. This can definitely be the case where
> Asterisk is installed on a general purpose VPS.

That's odd logic, IMHO.

OpenVZ (and likewise LXC, docker, systemd nspawn, rkt and the likes) are
containers: they seperate userspace while running on the same kernel.
This greatly reduces the overhead of virtualization compared to
full-system virtualization, such as KVM, VirtualBox or VMWare.

The reduced overhead naturally means that service providers are able to
overbook their service much more efficiently with openvz and the likes
than with vmware and the likes. But this is irrelevant if you run the
server.

There is a different issue of separation, but it is parallel to
performance.


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               Tzafrir Cohen
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