Thanks Lonnie
Yes I agree totally. But there is also another factor which is restoration time
and a broken Astlinux box have a much longer restoration time than all the
others.
I have actually had a couple of storage issues and a lightning strike so it
certainly happens and I don't know the longevity of the new Qotom boxes so I
need insurance!
Regards
Michael Knill
On 22/7/18, 3:06 am, "Lonnie Abelbeck" <li...@lonnie.abelbeck.com> wrote:
Hi Michael,
I don't have any experience to comment on your hot standby solution, but
just some birds-eye-view thoughts ...
1) Make sure your High Availability solution doesn't create more problems
than it solves.
2) Solve possible availability issues in order of likelihood.
For example, consider the following table of "Availability Normalized
Probability" (of my own creation) ...
Availability Normalized Probability
===================================
99) Power outage
95) Upstream network issue
80) Upstream SIP provider issue
10) Software misconfiguration (human) error
04) Local network issue (switch, cable, etc.)
03) AstLinux hardware issue (failed storage, power supply, etc.)
<1) Astroid strike
==
Note: The above table is a work in progress.
For example, it makes little sense to provide redundant network switches if
there is no Uninterruptible Power Supply or WAN failover.
My 2 cents.
Lonnie
> On Jul 20, 2018, at 8:11 PM, Michael Knill
<michael.kn...@ipcsolutions.com.au> wrote:
>
> Hi Group
>
> I have won a reasonable size customer (90 extensions) and Im currently
testing Astlinux hot standby.
> This is what I am planning to do:
> • The Astlinux HS is in parallel to the primary Astlinux server with
different IP Addresses on the internal and external interface but same subnet.
Its likely that these systems will be behind a firewall using NAT. The SIP
Trunk will be registered and not IP Address based.
> • The primary server periodically synchronises its config and database
to the HS server. I can basically use my standard backup and restore script to
do this
> • Both servers are remotely accessible
>
> In the event that the primary server fails, the following is performed to
failover to the HS server:
> • Add primary server IP as virtual IP on HS server e.g. ifconfig
eth1.100:1 172.30.30.1 netmask 255.255.255.0
> • Update ARP table e.g. arping -q -U -c 3 -I eth1.100 172.30.30.1
> • Register the SIP Trunk on the HS server
>
> My initial testing seems to work well and I cant find any issues.
>
> Obviously there are some caveats:
> • Don't sync gui.network.conf and Asterisk SIP Trunk config files as
they are different on the HS server
> • The virtual IP is not permanent. If the outage is long term, the HS
server should be converted into the primary (only a couple of files are
different)
> • Unless converted into the primary, any config changes (including
dynamic ones) will need to be synced to the primary server when failed back
> • Devstate will not be maintained
>
> Although this solution is not perfect, the ability to run up a new server
in minutes remotely is certainly a big plus.
>
> What do you think? Can you see any other issues?
>
> Regards
> Michael Knill
>
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------------------------------------------------------------------------------
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_______________________________________________
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Donations to support AstLinux are graciously accepted via PayPal to
pay...@krisk.org.
------------------------------------------------------------------------------
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engaging tech sites, Slashdot.org! http://sdm.link/slashdot
_______________________________________________
Astlinux-users mailing list
Astlinux-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/astlinux-users
Donations to support AstLinux are graciously accepted via PayPal to
pay...@krisk.org.
