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Logging en Docker
Juan Wajnerman, Santiago Palladino
Manas Technology Solutions
Scenarios
App logs to local file App logs to stdout/stderr
Logging inside container
Access
Rotation
Keep logs in host directory
mounted as data volume
Docker managed
docker logs
Logging to stdout/stderr
Configure docker log opts per
container or daemon
Docker logging drivers
● json-file
● syslog
● journald
● gelf
● fluentd
● awslogs
ELK logging stack
Lograge: formatted log output in Rails apps
GELF: log driver for all docker containers
Logstash: logs processing
ElasticSearch: logs storage
Kibana/Poirot: logs visualisation and reports
How it looks like
Application
Container
Docker
Daemon
Logstash
ElasticSearch
Kibana
Application
Container
Poirot
STDOUT
STDOUT
GELF POST
QUERY
Demo
Show me the code!
Thanks!
Juan Wajnerman
Santiago Palladino
@waj
@smpalladino
@manastech

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Logging in Docker

Notas do Editor

  1. Dos escenarios posibles a desarrollar
  2. Es difícil acceder a los logs, hay que meterse en el container Si no los rota la misma app, no los rota nadie (alternativa: multi process container, puaj) Solución de compromiso: mantener logs en directorio compartido con el host Facil acceso Rotarlos con logrotate desde afuera Se puede usar docker-gen para generar las templates
  3. Los logs del container se acceden via docker logs Por defecto, se guardan en un JSON manejado por docker que NO SE ROTA Setear: max-size max-file