[Spacewalk-list] HA Solution to Spacewalk

[Paul Robert Marino]

yes and no on the HA solution.
there is a way but its not really formalized.
on the database it depends on if you are using Oracle or PostgreSQL.
If you are using PostgreSQL 9.2 or higher I highly suggest using 3
database servers in cascading hot replication mode with pgpool acting
as a loadbalancer and managing the failover and recovery.


On the Spacewalk server side thats more complicated there are a couple
of options.
read these

1) syncing multiple satellite servers via inter-satellite-sync
    WARNING: This will not sync the hosts managed between them just
the channels, kickstart profiles erratas, etc..

    https://access.redhat.com/site/documentation/en-US/Red_Hat_Network_Satellite/5.5/html/Getting_Started_Guide/sect-Getting_Started_Guide-Multiple_Satellites-ISS_Use_Cases.html

    https://access.redhat.com/site/documentation/en-US/Red_Hat_Network_Satellite/5.5/html/Installation_Guide/sect-Installation_Guide-Example_Topologies-Multiple_Satellite_Horizontally_Tiered_Topology.html

   https://access.redhat.com/site/documentation/en-US/Red_Hat_Network_Satellite/5.5/html/Installation_Guide/sect-Installation_Guide-Maintenance-Backing_Up_the_Satellite.html


2) True HA configuration

    https://access.redhat.com/site/documentation/en-US/Red_Hat_Network_Satellite/5.5/html/Installation_Guide/sect-Installation_Guide-Maintenance-Establishing_Redundant_Satellites_with_Stand_Alone_DB.html

    I use Gluster for the shared volumes :-)
    I also use keepalived as the loadbalancer and also to handle
taskomatic with some custom scripts since it can only run on one host
at a time.
    I also found it usefull to use a shared volume for
/var/www/html/pub/ as well.
    the one bad thing about this is Ive found that some things have
been left out of this doc for example it mentions noting about like
clustering jabber for osa-dispacher




On Wed, Mar 5, 2014 at 11:49 AM, Nelson Marques <nmo.marques at gmail.com> wrote:
> Hi,
>
> Load Balancing should be with 'sticky sessions' and Tomcats need to be
> clustered for session management (I'm not sure is the webapps play any role
> on that, though someone can point it). That in theory should work. I'm going
> for a similar architecture, though currently I'm struggling with updating to
> SW2.1 (schema update).
>
> NM
>
>
> 2014-03-05 14:44 GMT+00:00 Rick van der Linde <rick at rilp.nl>:
>>
>> Hi all,
>>
>>
>>
>>
>>
>> Since more and more intellectual capital is situated in my spaealk
>> solution I wonder if it's possible to make ik HA.
>>
>>
>>
>> Let me explain what I;m thinking of:
>>
>>
>>
>> Seperated DB that is (synchroneously) replicated. Tha (DB) service address
>> will switchover to the other server when something occurs. In my opinion
>> this is a "proven" concept. But the trick part is next:
>>
>>
>>
>> I want to build the spacewalk application onto multiple servers with
>> shared storage. In front of these I would like to "load-balance" the
>> connections. Most bequtifull would be that sessions get handled by multiple
>> servers, but according to me sessions are not stateless. Load balancing will
>> then be possible with connection affinity set. (That is once connected all
>> requests will be handled by the server connected till the session ends). Do
>> you know is this is possible?
>>
>>
>>
>> last is which filesystems should be shared across the load balanced
>> servers to keep them in sync?
>>
>>
>>
>> Filesystems I can mention are:
>>
>>
>>
>> /var/satellite
>>
>> /var/lib/cobbler
>>
>> /var/lib/tftpboot
>>
>>
>>
>> Clients should then access the LBR address.
>>
>>
>>
>> Thanks in advance,
>>
>>
>>
>>
>>
>> Rick
>>
>>
>>
>>
>> _______________________________________________
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>
>
>
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