On 1 September 2017 at 15:54, Lukas Slebodnik <lslebodn(a)redhat.com> wrote:
On (01/09/17 09:33), William Edsall wrote:
>Had a few communications with Michal but we're still stuck.
>One issue is that we have dozens of domain controllers globally. A standard
>dns lookup could give me a domain controller overseas which will be slow,
>or maybe even a domain controller that isn't responding. As such, I have
>been inserting ad_server = x into the sssd.conf to improve performance.
>I noticed that if I do not insert ad_server = x, I'm getting different
>results. My initial id request is very slow but seems to produce results.
>While searching, it seems to also be 'inserting' users into the users hash
>table - almost as if it's searching and inserting our entire user database?
>For example there are countless lines of the following:
>(Fri Sep 1 09:28:37 2017) [sssd[be[example.com]]]
>[sdap_nested_group_hash_insert] (0x4000): Inserting
>[CN=user_name,OU=bla,OU=bla Users,DC=dow,DC=com] into hash table [users]
>As my initial id request returns, it seems to return several chunks of my
>group ids at once as if it's processing them individually and searching all
>users in that group (thus the above log entries).
>Not sure if this helps or just muds up the issue but it's strange indeed.
You needn't hardcode ad_server. You can still rely on dns discovery.
I assume you use sites in AD. So you can "pin" sssd to your local/nearest site
with option ad_site.
I've got something to add to this, some behaviour we're seeing with
CentOS 7 servers using sssd-ad.
In our case we have some DCs which are located at a partner site, and
are therefore inaccessible to clients on our standard LANs.
When SSSD starts it will correctly determine there are 2 primary DCs
(these are the ones for the site) and 7 backup DCs.
However, what is happening from time to time is that for some reason
I've not yet determined the connection(s) to the primary DC(s) are
dropping, and then sssd attempts to connect to one of the DCs that are
In what circumstances would sssd prefer a backup server to a primary server?
I've got a chunk of log which I've anonymised:
Here the server is PAL221 in site "London" and the local DCs are dc03
and dc04. dc06 is in the site which cannot be accessed.
I have now turned debug level up to 9 for this domain config, and
could provide the unmodified log privately if required.
John Beranek To generalise is to be an idiot.
-- William Blake