Workaround to Fix DNS Issue

23 Workaround to Fix DNS Issue

After completing upgrade of SDS primary query server, if DNS resolution fails, perform the following steps:

Verify the QS server transitions to a “A” State, log in to QS Server with the admusr account. Run the command:
```
[admusr@SG2-SDS-QS ~]$ sudo prod.state               
                                ...prod.state RUNID=00)...                
                                ...getting current state...
        Current state:  A  (product under procmgr)
```
1. If current state is "A", stop and continue completing the upgrade.
2. If not, then continue to the next step.

Verify the permissions of the /etc/resolv.conf file is 644. Execute:

[admusr@SG2-SDS-QS ~]$ ll
        /etc/resolv.conf
    -rw-r--r-- 1 root root 73 Feb 21 19:47 /etc/resolv.conf

Verify the /etc/resolv.conf file contains the upgraded standby server. Check the file content:
```
[admusr@SG2-SDS-QS ~]$ sudo cat
        /etc/resolv.conf<Primary Server
        A><Primary Server
        B><Secondary Server
        B>
```
If not, checkout and edit the file as shown using the steps below.

Using the rcstool checkout the /etc/resolv.conf file.

[admusr@SG2-SDS-QS ~]$ sudo
        rcstool co /etc/resolv.conf
    RCS_VERSION=x.x

Edit the /etc/resolv.conf file.

[admusr@SG2-SDS-QS ~]$ sudo vi /etc/resolv.conf

Double Check that the /etc/resolv.conf file updates are as desired from edit above.

[admusr@SG2-SDS-QS ~]$ sudo cat /etc/resolv.conf
         <Primary Server A>
         <Primary Server B>
         <Secondary Server B>

Using the rcstool check in the /etc/resolv.conf file.

[admusr@SG2-SDS-QS ~]$ sudo rcstool ci /etc/resolv.conf

Clear DNS cache using the nscd command.

[admusr@SG2-SDS-QS ~]$ sudo nscd -i hosts

Verify the QS server transitions to a “A” State.

[admusr@SG2-SDS-QS ~]$ sudo prod.state              
                           ...prod.state (RUNID=00)...                
                           ...getting current state...
    Current state:  A (product under procmgr)