01-18-2020
Hi Neo,
First level failure: The CPU DNS server (Windows DC) spiked. This DNS server appears as the 2nd server in /etc/resolv.conf file.
Second (result of the 1st): Application servers were unable to connect to DB server. Logs reported --unable to find DB connection stream
When we reproduced the situation (kept 2nd DNS server down), the application server was unable to connect to DB server. But "nslookup <host> " worked
--- Post updated at 07:22 AM ---
Neo,
Also please note that fixing the root cause (CPU spike or death of one DNS server) is not what I want. I want to solve the fact that resiliency did not work-- why app servers were unable to connect while only DNS server out of two was down.
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LEARN ABOUT CENTOS
ipa-client-automount
ipa-client-automount(1) IPA Manual Pages ipa-client-automount(1)
NAME
ipa-client-automount - Configure automount and NFS for IPA
SYNOPSIS
ipa-client-automount [OPTION]... <location>
DESCRIPTION
Configures automount for IPA.
The automount configuration consists of three files:
o /etc/nsswitch.conf
o /etc/sysconfig/autofs
o /etc/autofs_ldap_auth.conf
By default this will use DNS discovery to attempt to determine the IPA server(s) to use. If IPA servers are discovered then the automount
client will be configured to use DNS discovery.
If DNS discovery fails or a specific server is desired, use the --server option.
The default automount location is named default. To specify a different one use the --location option.
The IPA client must already be configured in order to configure automount. The IPA client is configured as part of a server installation.
There are two ways to configure automount. The default is to use sssd to manage the automount maps. Alternatively autofs can configured to
bind to LDAP over GSSAPI and authenticate using the machine's host principal.
The nsswitch automount service is configured to use either sss or ldap and files depending on whether SSSD is configured or not.
NFSv4 is also configured. The rpc.gssd and rpc.idmapd are started on clients to support Kerberos-secured mounts.
OPTIONS
--server=SERVER Set the IPA server to connect to
--location=LOCATION
Automount location
-S, --no-sssd
Do not configure the client to use SSSD for automount
-d, --debug
Print debugging information to stdout
-U, --unattended
Unattended installation. The user will not be prompted
--uninstall
Restore the automount configuration files
FILES
Files that will be always be configured:
/etc/nsswitch.conf
Files that will be configured when SSSD is the automount client (default):
/etc/sssd/sssd.conf
Files that will be configured when using the ldap automount client:
/etc/sysconfig/autofs
/etc/autofs_ldap_auth.conf
EXIT STATUS
0 if the installation was successful
1 if an error occurred
IPA
May 25 2012 ipa-client-automount(1)