What is this about? GrokConstructor is a helper for testing and incremental construction of regular expressions for the grok filter that parses logfile lines for Logstash. Logstash, part of the ELK-Stack, is a tool to collect log files from various sources, parse them into a JSON format and put them into one or more databases, index engines and so forth - often elasticsearch. In the simplest case
This tries to parse a set of given logfile lines with a given grok regular expression (based on Oniguruma regular expressions ) and prints the matches for named patterns for each log line. You can also apply a multiline filter first. Please enter some loglines for which you want to check a grok pattern, the grok expression that should match these, mark the pattern libraries you draw your patterns
Say that title five times fast! Seriously though, I wasn’t sure what else to call this article so that people would actually find it. This article is a spiritual successor to Evan Hazlett’s article on running the ELK stack in Docker and ClusterHQ’s article on doing it with Fig/Docker Compose and Flocker. Huge shout out to them for being the giants whose shoulders I stand on. It is also influenced
When things go south with our applications — as they sometimes do, whether we like it or not — our log files are normally among the first places where we go when we start the troubleshooting process. The big “but” here is that despite the fact that log files contain a wealth of helpful information about events, they are usually extremely difficult to decipher. A modern web application environment
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