You're reading from Learn PostgreSQL

Product typeBook

Published inOct 2020

Reading LevelIntermediate

PublisherPackt

ISBN-139781838985288

Edition1st Edition

Languages

SQL

Tools

PostgreSQL

Concepts

Databases

Authors (2):

Luca Ferrari

Enrico Pirozzi

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Managing incoming connections at the role level

When a new connection is established to a cluster, PostgreSQL validates the incoming request at the role level. The fact that the role has the LOGIN property is not enough for it to open a new connection to any database within the cluster. This is because PostgreSQL checks the incoming connection request against a kind of firewall table, formerly know as host-based access, that is defined within the pg_hba.conf file.

If the table states that the role can open the connection to the specified database, the connection is granted (assuming it has the LOGIN property); otherwise, it is rejected.

Every time you modify the pg_hba.conf file, you need to instruct the cluster to reload the new rules via a HUP signal or by means of a reload command in pg_ctl. Therefore, the usual workflow when dealing with pg_hba.conf is similar to the following:

$ $EDITOR $PGDATA/pg_hba.conf
... modify the file as you wish ...

$ sudo -u postgres pg_ctl reload -D $PGDATA...

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Published in: Oct 2020Publisher: PacktISBN-13: 9781838985288

Authors (2)

Luca Ferrari

Luca Ferrari has been passionate about computer science since the Commodore 64 era, and today holds a master's degree (with honors) and a Ph.D. from the University of Modena and Reggio Emilia. He has written several research papers, technical articles, and book chapters. In 2011, he was named an Adjunct Professor by Nipissing University. An avid Unix user, he is a strong advocate of open source, and in his free time, he collaborates with a few projects. He met PostgreSQL back in release 7.3; he was a founder and former president of the Italian PostgreSQL Community (ITPUG). He also talks regularly at technical conferences and events and delivers professional training.
Read more about Luca Ferrari

Enrico Pirozzi

Enrico Pirozzi, EnterpriseDB certified on implementation management and tuning, with a master's in computer science, has been a PostgreSQL DBA since 2003. Based in Italy, he has been providing database advice to clients in industries such as manufacturing and web development for 10 years. He has been training others on PostgreSQL since 2008. Dedicated to open source technology since early in his career, he is a cofounder of the PostgreSQL Italian mailing list, PostgreSQL-it, and of the PostgreSQL Italian community site, PSQL
Read more about Enrico Pirozzi

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Managing incoming connections at the role level

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