To view PostgreSQL logs in the Elastic stack (also known as the ELK stack), you will need to do the following:
-
Install and configure the Elasticsearch, Logstash, and Kibana components of the ELK stack. You can find detailed instructions for doing this on the Elastic website.
-
Configure PostgreSQL to log to a file. You can do this by adding the following line to your PostgreSQL configuration file (usually located at
/etc/postgresql/<version>/main/postgresql.conf):
logging_collector = on
This will enable PostgreSQL to log to a file located at pg_log/postgresql-<timestamp>.log.
- Configure Logstash to read the PostgreSQL log file and send it to Elasticsearch. To do this, create a configuration file for Logstash (e.g.,
/etc/logstash/conf.d/postgresql.conf) with the following contents:
input {
file {
path => "/var/lib/postgresql/<version>/main/pg_log/postgresql-*.log"
start_position => "beginning"
}
}
filter {
grok {
match => { "message" => "%{TIMESTAMP_ISO8601:timestamp} %{LOGLEVEL:loglevel} %{GREEDYDATA:message}" }
}
}
output {
elasticsearch {
hosts => ["localhost:9200"]
}
}
This configuration file tells Logstash to read the PostgreSQL log file, parse the log messages using the grok filter, and send the resulting data to Elasticsearch.
-
Start Logstash and Elasticsearch.
-
Use Kibana to view the PostgreSQL logs in Elasticsearch. In Kibana, go to the “Discover” tab and select the “postgresql” index pattern. You should then be able to see the PostgreSQL logs in Kibana.
I hope this helps! Let me know if you have any questions.
