On Thu, Oct 20, 2016 at 05:58:50AM -0000, Aleksey Maksimov wrote:
> Hello, Justin!
>
> > "I cannot confirm if the link you provided has the correct steps"
>
> These steps I tested on several other servers. Everything works.
> The problem occurred on only one server (I wrote about this earlier).
> This is the most strange in this situation.
>
>
> > "I would search for 'mark_offline' in the domain log file and look just
> > above this to get an idea of what causes the backend to be set offline. "
>
> Here's what I found in the domain log:
>
>
> (Wed Oct 19 16:52:25 2016) [sssd[be[ad.holding.com]]] [fo_set_port_status]
> (0x0100): Marking port 389 of server 'msk-dc01.holding.com' as 'not working'
> (Wed Oct 19 16:52:25 2016) [sssd[be[ad.holding.com]]] [ad_user_data_cmp]
> (0x1000): Comparing LDAP with LDAP
> (Wed Oct 19 16:52:25 2016) [sssd[be[ad.holding.com]]] [fo_set_port_status]
> (0x0400): Marking port 389 of duplicate server 'msk-dc01.holding.com' as 'not
> working'
> (Wed Oct 19 16:52:25 2016) [sssd[be[ad.holding.com]]] [ad_user_data_cmp]
> (0x1000): Comparing LDAP with LDAP
> (Wed Oct 19 16:52:25 2016) [sssd[be[ad.holding.com]]] [sdap_handle_release]
> (0x2000): Trace: sh[0x7f590093da10], connected[1], ops[(nil)],
> ldap[0x7f5900927d10], destructor_lock[0], release_memory[0]
> (Wed Oct 19 16:52:25 2016) [sssd[be[ad.holding.com]]]
> [remove_connection_callback] (0x4000): Successfully removed connection
> callback.
> (Wed Oct 19 16:52:25 2016) [sssd[be[ad.holding.com]]] [be_mark_offline]
> (0x2000): Going offline!
> (Wed Oct 19 16:52:25 2016) [sssd[be[ad.holding.com]]] [be_mark_offline]
> (0x2000): Initialize check_if_online_ptask.
> (Wed Oct 19 16:52:25 2016) [sssd[be[ad.holding.com]]] [be_ptask_create]
> (0x0400): Periodic task [Check if online (periodic)] was created
> (Wed Oct 19 16:52:25 2016) [sssd[be[ad.holding.com]]] [be_ptask_schedule]
> (0x0400): Task [Check if online (periodic)]: scheduling task 82 seconds from
> now [1476885227]
> (Wed Oct 19 16:52:25 2016) [sssd[be[ad.holding.com]]] [be_run_offline_cb]
> (0x0080): Going offline. Running callbacks.
> (Wed Oct 19 16:52:25 2016) [sssd[be[ad.holding.com]]]
> [sdap_id_op_connect_done] (0x4000): notify offline to op #1
> (Wed Oct 19 16:52:25 2016) [sssd[be[ad.holding.com]]] [be_mark_dom_offline]
> (0x1000): Marking subdomain holding.com offline
> (Wed Oct 19 16:52:25 2016) [sssd[be[ad.holding.com]]]
> [be_mark_subdom_offline] (0x1000): Marking subdomain holding.com as inactive
> (Wed Oct 19 16:52:25 2016) [sssd[be[ad.holding.com]]]
> [ad_subdomains_root_conn_done] (0x0040): Failed to connect to AD server:
> [11](Resource temporarily unavailable)
> (Wed Oct 19 16:52:25 2016) [sssd[be[ad.holding.com]]]
> [get_subdomains_callback] (0x0400): Backend returned: (1, 11, <NULL>)
> [Provider is Offline (Have exhausted maximum number of retries for service)]
> (Wed Oct 19 16:52:25 2016) [sssd[be[ad.holding.com]]] [be_queue_next_request]
> (0x4000): Queued request filed successfully.
> (Wed Oct 19 16:52:25 2016) [sssd[be[ad.holding.com]]]
> [sdap_id_op_connect_done] (0x4000): notify offline to op #2
> (Wed Oct 19 16:52:25 2016) [sssd[be[ad.holding.com]]] [be_mark_dom_offline]
> (0x1000): Marking subdomain holding.com offline
> (Wed Oct 19 16:52:25 2016) [sssd[be[ad.holding.com]]]
> [be_mark_subdom_offline] (0x4000): Subdomain already inactive
> (Wed Oct 19 16:52:25 2016) [sssd[be[ad.holding.com]]]
> [ad_subdomains_root_conn_done] (0x0040): Failed to connect to AD server:
> [11](Resource temporarily unavailable)
> (Wed Oct 19 16:52:25 2016) [sssd[be[ad.holding.com]]]
> [sdap_id_release_conn_data] (0x4000): releasing unused connection
> (Wed Oct 19 16:52:25 2016) [sssd[be[ad.holding.com]]]
> [get_subdomains_callback] (0x0400): Backend returned: (0, 0, <NULL>) [Success
> (Success)]
> (Wed Oct 19 16:52:25 2016) [sssd[be[ad.holding.com]]] [be_queue_next_request]
> (0x4000): Request queue is empty.
>
>
> Why SSSD is trying to access the root domain controller
> (msk-dc01.holding.com) ?
Because it's trying to read the list of trusted domains in the forest.
>
> In our case, the root domain controllers have access restrictions. This is a
> normal situation for large domains.
>
> In my configuration file sssd.conf explicitly specified domain controllers
> that SSSD should use for authorization
>
> [domain/ad.holding.com]
> ad_server = kom-dc01.ad.holding.com, kom-dc02.ad.holding.com
Yes, but the trusted domains are discovered by the "subdomains_provider"
which always uses SRV discovery to read the list of AD DCs. Starting
with sssd-1.14 you can use a new option "ad_enabled_domains" to only
list the domains sssd should be allowed to "see".
In previous versions, the only other workaround is to disable the
subdomains provider completely:
subdomains_provider = none
but then you need to define the domain SID manually if you want to use
ID-mapping.
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