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IDS Forum

Re: HDR Question

Posted By: david@smooth1.co.uk
Date: Thursday, 23 November 2017, at 12:53 p.m.

In Response To: Re: HDR Question (Marcus Haarmann)

All,

I do wish people would stop saying /etc/hosts and /etc/services, it is not the early 90's!

I prefer "your hostname resolution service" and "your servicename resolution service".

The file /etc/nsswitch.conf shows how hostnames and services are resolved:

grep hosts /etc/nsswitch.conf
#hosts: db files nisplus nis dns
hosts: files dns myhostname

grep services /etc/nsswitch.conf
# sorted with the most-used services at the beginning.
#services: nisplus [NOTFOUND=return] files
services: files sss

man nsswitch.conf

Be aware that in Version 11.70 and higher by default Informix will cache hosts and services information so changes may not show up immediately.

NS_CACHE host=900,service=900,user=900,group=900

https://www.ibm.com/support/knowledgecenter/en/SSGU8G_12.1.0/com.ibm.adref.doc/ids_adr_1105.htm

Any NS_CACHE field can be temporarily set to 0 to flush the cache:

https://www.ibm.com/support/knowledgecenter/en/SSGU8G_11.70.0/com.ibm.adref.doc/ids_adr_0439.htm

Regards,
David.

Regards,
David.

> On 23 November 2017 at 15:56 Marcus Haarmann <marcus.haarmann@midoco.de> wrote:
>
>
> Ok, just some steps/checks:
>
> 1) preparation of the sqlhosts file is needed
> - you need to have minimum one entry for the primary instance, and one entry
> for the secondary instance.
> We keep the file identical on both hosts
> The lines should be like:
> prim onipcshm localhost localhost
> prim_tcp onsoctcp <IP or hostname> <PortNr or Servicename>
> sec onipcshm localhost localhost
> sec_tcp onsoctcp <IP or hostname> <PortNr or Servicename>
>
> In case you use a hostname, check with ping if the hostname is resolvable.
> You might use an IP address instead.
> It should not be localhost or 127.0.0.1
>
> In case you use a servicename instead of a portnumber, check the /etc/services
> file for a correct mapping
> e.g. informix 1596/tcp
>
> If you do not use a servicename, put only the portnumber (not the trailing
> /tcp as in the services file)
>
> 2) check if the primary server is available with dbaccess locally, while
> INFORMIXSERVER env is set prim_tcp
> 3) check your machine trust, this is in a configurable file named in onconfig
> with REMOTE_SERVER_CFG setting
>
> https://www.ibm.com/support/knowledgecenter/en/SSGU8G_12.1.0/com.ibm.admin.doc/ids_admin_1407.htm
> You should have there a trust on both sides for the other server (prim trusts
> sec and vice versa)
> 4) check if the primary server is available with dbaccess from the secondary
> machine, INFORMIXSERVER again prim_tcp
> You should be able to connect without giving a password
> 5) set the primary instance in master mode using onmode -d primary sec_tcp
> 6) Now you are reade to start the secondary by a physical restore (ontape -p
> or the equivalent onbar mechanism) and at the end
> onmode -d secondary prim_tcp
>
> Look at the online.log of the primary. It should state something about
> "secondary connected".
> The primary will then start to send the logs which have been used since backup
> time and inform you
> about success with "primary server operational". In the secondary log, you
> will have the opposite info "secondary server operational".
>
> This is it (normally). Things like how role change is done or setting up an
> automatic failover have to be learned late on.
>
> Marcus Haarmann
>
> Von: "BENJI LONG" <ruggedmouse@hotmail.com>
> An: "ids" <ids@iiug.org>
> Gesendet: Donnerstag, 23. November 2017 16:34:40
> Betreff: Re: RE: RE: HDR Question [40260]
>
> found something else out.
> One way, I'm getting error 908, and the other way I'm getting error 930.
>
> The 930 error is saying it cannot connect to the server name which is in the
> sqlhosts file
>
> The 908 error is saying the attempt to connect to the server failed but it
> isnt' giving me the name from the sqlhosts file. I'm not sure what it is
> giving me. It looks like it is the SERVERALIAS I have in the onconfig file.
>
>
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>
>
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>

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