samba - Sep 2024 - Samba-AD 100% CPU utilization

Hi,

We have 5 domain controllers in our cluster. We are running samba 
version 4.19.5

In one of the servers which is acting as pdc emulator, we have been 
observing 100% cpu utilization randomly. This happens on only one server 
with PDC emulator role. All Samba servers have same OS RHEL 9 and same 
Samba version 4.19.5.

smb.conf on all 5 servers remain same. Giving here smb.conf from one 
server.

# Global parameters
[global]
 ??????? netbios name = PDC
 ??????? realm = **********.COM
 ??????? server role = active directory domain controller
 ??????? workgroup = *********
 ??????? server services = s3fs, rpc, nbt, wrepl, ldap, cldap, kdc, 
drepl, winbindd, ntp_signd, kcc, dns, dnsupdate
 ??????? workgroup = **********
 ??????? idmap_ldb:use rfc2307 = yes
 ??????? ldap server require strong auth = No
 ??????? allow dns updates = nonsecure
 ??? ??? tls priority = NORMAL:-VERS-TLS-ALL:+VERS-TLS1.2
 ??????? log level = 3 auth_audit:0 auth_json_audit:3 dsdb_json_audit:5
 ??????? log file = /var/log/samba/pdc.log
 ??????? max log size = 1000000000

[sysvol]
 ??????? path = /usr/local/samba/var/locks/sysvol
 ??????? read only = No

[netlogon]
 ??????? path = /usr/local/samba/var/locks/sysvol/*********.com/scripts
 ??????? read only = No


Is there any way that we can loadbalance across all 5 servers? Can it be 
configured through smb.conf?

Thanks & regards,
Anantha Raghava

On Tue, 10 Sep 2024 10:48:05 +0530
Anantha Raghava via samba <samba at lists.samba.org> wrote:
> Hi,
> 
> We have 5 domain controllers in our cluster. We are running samba 
> version 4.19.5
> 
> In one of the servers which is acting as pdc emulator, we have been 
> observing 100% cpu utilization randomly. This happens on only one
> server with PDC emulator role. All Samba servers have same OS RHEL 9
> and same Samba version 4.19.5.
> 
Have considered that this could just be something wrong with this DC ?
I would try transferring the FSMO roles to another DC and see if the
problem transfers as well.

Rowland