![]() Now you need to signal the server to reload the configuration file. If you logged in as root, logout using ctrl d. A record can have one of 7 formats, see the documentation for more information: # IPv4 local connections: host foreigndb fdwuser 127.0.0.1/32 md5 Under IPv4 local connections add a line for the foreign database using the read-only user. Next, open pg_hba.conf in your text editor of choice. Brew installations won’t require you to log in as the superuser. However, the easiest way to find your data directory (where pg_hba.conf is located) is to query it directly in a psql instance: foreigndb=# SHOW hba_file hba_file - /Library/PostgreSQL/11/data/pg_hba.conf (1 row) foreigndb=# SHOW data_directory data_directory - /Library/PostgreSQL/11/data (1 row)ĭepending on your OS, you may need to log in as root to access /Library/PostgreSQL/11/data by logging in as sudo su. The most common installations for postgreSQL are homebrew and EnterpriseDB. This is configured in pg_hba.confįirst, find where your pg_hba.conf is located. When our foreign data wrapper is set up, we’ll need the foreign server to prompt the user for a password. Create foreign data wrapper aws postgresql update#Then, in the foreign database ( foreigndb) we’ll grant this user read-only access to the table in question, and usage on the schema where our table lives (in this case public ) foreigndb=# CREATE USER fdwUser WITH PASSWORD 'secret' CREATE ROLE foreigndb=# GRANT USAGE ON SCHEMA PUBLIC TO fdwUser GRANT foreigndb=# GRANT SELECT ON account_metrics TO fdwUser GRANT Step 1.5: Update your pg_hba.conf if necessary This foreign user is the user that we’ll use for user mapping, which will be discussed later in this article. I want to access a table account_metrics in foreigndb from localdb: postgres=# \l List of databases Name | Owner | Encoding | Collate | Ctype | Access privileges - - - - - - localdb | postgres | UTF8 | C | C | foreigndb | postgres | UTF8 | C | C | (2 rows)Īnd a look at the account_metrics table: foreigndb=# select * from account_metrics id | time_spent | pages_viewed - - - 1 | 60 | 5 2 | 100 | 2 3 | 15 | 5 (3 rows) Step 1: Set up a Foreign Userįor security reasons, you’ll likely want to create a read-only user to act as the go-between. Allows you to control the permissions on the foreign tablesįor this example, we’ll use the databases localdb and foreigndb.Your data may be segregated across databases, but still related in ways that makes being able to combine or aggregate it desirable.Foreign data wrappers can serve all sorts of purposes: A foreign data wrapper is an extension available in PostgreSQL that allows you to access a table or schema in one database from another. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |