![]() This value is derived from the shared_buffers value. See PostgreSQL information on Managing Kernel Resources for more information on setting kernel resources. This requires that the operating system can allocate sufficient shared memory. You may have to increase the system resources available to PostgreSQL, as described at Connection Settings. In general, allow each database on a host 100 maximumĬonnections and then add 50 extra connections. max_connection - For large clusters, each database is typically hosted on a different host.Consider the following settings as starting points. Large clusters - Can contain up to 1000 hosts.Max_wal_size = (3 * checkpoint_segments) * 16MB The PostgreSQL 9.5 release notes provides the following formula for determining the new settings: Higher, replaced by min_wal_size and max_wal_size. Note: The checkpoint_segments setting is removed in PostgreSQL 9.5 and For example, if the Cloudera Manager Server is running on the same host as other roles, the following values may be acceptable: Tuning may be required based on each host's resource utilization. If resources are limited, consider reducing the buffer sizes and checkpoint segments further. Small to mid-sized clusters - Consider the following settings as starting points.Settings vary based on cluster size and resources as follows: Update these settings in the /var/lib/pgsql/data/nf or /var/lib/postgresql/data/nf file. Configure settings to ensure your system performs as expected.Want to access PostgreSQL from a different host, replace 127.0.0.1 with your IP address and update nf, which is typicallyįound in the same place as pg_hba.conf, to include: listen_addresses = '*' You can modify the contents of the md5 line shown above to support different configurations. Failure to do so may cause an authentication error when running the scm_prepare_database.sh script. Then the host line specifying md5 authentication shown above must be inserted before this ident line. If the default pg_hba.conf file contains the following line: Edit pg_hba.conf, which is usually found in /var/lib/pgsql/data or /etc/postgresql/ /main. SLES 12: sudo su -l postgres -c "initdb -pgdata=/var/lib/pgsql/data -encoding=UTF-8".RHEL 6: echo 'LC_ALL="en_US.UTF-8"' > /etc/default/locale.Sudo su -l postgres -c "postgresql-setup initdb" Make sure that LC_ALL is set to en_US.UTF-8 and initialize the database as follows:.If you do not make these changes, the services cannot connect to and use the database on which they depend. Hosting the services for which you are configuring databases. You must reconfigure PostgreSQL to accept connections from the fully qualified domain names (FQDN) of the hosts Note: If you are making changes to an existing database, make sure to stop any services that use theīy default, PostgreSQL only accepts connections on the loopback interface. SLES 12 Install the python-psycopg2 package: Sudo bash -c "source /opt/rh/python27/enable pip install psycopg2=2.6.2 -ignore-installed" You can verify this by running the following commands: Make sure that you have installed Python 2.7.Sudo pip install psycopg2=2.7.5 -ignore-installed These examples install version 2.7.5 (2.6.2 for RHEL 6): RHEL 7 Compatible If you are installing or upgrading to CDH 6 and using PostgreSQL for the Hue database, you must install psycopg2 2.5.4 or higher on all Hue hosts asįollows. The psycopg2 package is automatically installed as a dependency of Cloudera Manager Agent, but the version installed is often lower than 2.5.4. Hue in CDH 6 requires version 2.5.4 or higher of the psycopg2 Python package for connecting to a PostgreSQL database.
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