Queries Regarding Postgresql Replication

Hi ,
I have some couple of queries while doing postgres replication,

===> How to find whether current postgres is running as master or slave?

====> What is the procedure to make the failed master as working slave?

Could you please clarify above queries.

Thanks and Regards
Nithya R
Lead Engineer| Tel-Pw-LTE| AMB-5
HCL Technologies | Chennai- 600 058
[cid:image001(dot)jpg(at)01CC0B46(dot)535BC080]

________________________________
::DISCLAIMER::
-----------------------------------------------------------------------------------------------------------------------

The contents of this e-mail and any attachment(s) are confidential and intended for the named recipient(s) only.
It shall not attach any liability on the originator or HCL or its affiliates. Any views or opinions presented in
this email are solely those of the author and may not necessarily reflect the opinions of HCL or its affiliates.
Any form of reproduction, dissemination, copying, disclosure, modification, distribution and / or publication of
this message without the prior written consent of the author of this e-mail is strictly prohibited. If you have
received this email in error please delete it and notify the sender immediately. Before opening any mail and
attachments please check them for viruses and defect.

-----------------------------------------------------------------------------------------------------------------------