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Production Debugging & Logging
A Guide for Modern Infrastructure
Ariel Assaraf
Co-founder & CPO
Coralogix
ariel@coralogix.com
Agenda
» Formats – unstructured Vs JSON
» Log severity definition
» Logging best practices
» Alerts: why you need them
» Alerts: How to properly define
» Alerts: to push or not to push
» A new approach towards logging
» Bonus: why logs are called logs?
Format
Why JSON?
» Easier to filter and group
» Easier to visualize
» Easily read
» Supported by most coding languages and loggers
Why JSON
Example log:
1) Ariel, 29, 33 Bilu, Tel-Aviv, Israel, 2012-09-28
2) Lior, 32, 110 Ben Gurion, Herzelia, Israel, 2012-09-29
We want to find all users who are 29 years old:
$ grep 29 file.log | cut -d , -f 2 |sort |uniq -c |sort -nr
What do we get?
1) Ariel, 29, 33 Bilu Sharet, Tel-Aviv, Israel, 2012-09-28
2) Lior, 32, 110 Ben Gurion, Herzelia, Israel, 2012-09-29
Log severity definition
» Debug/Verbose – ‘Number of messages in the user creation
queue = 3482’
» Info – ‘Money transaction completed successfully’
» Warning – ‘Received illegal character for username –
“Jame$”,ignoring char’
» Error – ‘Failed to execute query for user ID 3424098’
» Critical/Fatal – ‘No connection to DB, failed to register user’
Logging best practices
» Log communications between components – Microservices,
spot instances.
» Log communications with external API’s
» Add valuable metadata to your logs
» Remember that you are not the only one reading these logs
» Combine textual and metric fields
Alerts
» Why you need them
» How to properly define alerts
» The different types of alerts
» Creating the right structure for alert handling
» To push, or not to push.
A New Approach
For Logging
Questions?

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Production debugging & Logging

  • 1. Production Debugging & Logging A Guide for Modern Infrastructure Ariel Assaraf Co-founder & CPO Coralogix ariel@coralogix.com
  • 2. Agenda » Formats – unstructured Vs JSON » Log severity definition » Logging best practices » Alerts: why you need them » Alerts: How to properly define » Alerts: to push or not to push » A new approach towards logging » Bonus: why logs are called logs?
  • 3. Format Why JSON? » Easier to filter and group » Easier to visualize » Easily read » Supported by most coding languages and loggers
  • 4. Why JSON Example log: 1) Ariel, 29, 33 Bilu, Tel-Aviv, Israel, 2012-09-28 2) Lior, 32, 110 Ben Gurion, Herzelia, Israel, 2012-09-29 We want to find all users who are 29 years old: $ grep 29 file.log | cut -d , -f 2 |sort |uniq -c |sort -nr What do we get? 1) Ariel, 29, 33 Bilu Sharet, Tel-Aviv, Israel, 2012-09-28 2) Lior, 32, 110 Ben Gurion, Herzelia, Israel, 2012-09-29
  • 5. Log severity definition » Debug/Verbose – ‘Number of messages in the user creation queue = 3482’ » Info – ‘Money transaction completed successfully’ » Warning – ‘Received illegal character for username – “Jame$”,ignoring char’ » Error – ‘Failed to execute query for user ID 3424098’ » Critical/Fatal – ‘No connection to DB, failed to register user’
  • 6. Logging best practices » Log communications between components – Microservices, spot instances. » Log communications with external API’s » Add valuable metadata to your logs » Remember that you are not the only one reading these logs » Combine textual and metric fields
  • 7. Alerts » Why you need them » How to properly define alerts » The different types of alerts » Creating the right structure for alert handling » To push, or not to push.