Centralized Logging Patterns
A presentation at All Day DevOps by Philipp Krenn
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Developer @xeraa
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Apache License 2.0 @xeraa
Disclaimer I build highly monitored Hello World apps @xeraa
Example: Java SLF4J, Logback, MDC @xeraa
.NET: NLog PHP: Monolog JavaScript: Winston ... @xeraa
Anti-Pattern: print System.out.println("Oops"); @xeraa
Anti-Pattern: Coupling @xeraa
Parse @xeraa
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[2018-09-28 10:30:38.516] ERROR net.xeraa.logging.LogMe [main] - user_experience= , session=46, loop=15 - Wake me up at night java.lang.RuntimeException: Bad runtime... at net.xeraa.logging.LogMe.main(LogMe.java:30) ^[%{TIMESTAMP_ISO8601:timestamp}]%{SPACE}%{LOGLEVEL:level} %{SPACE}%{USERNAME:logger}%{SPACE}[%{WORD:thread}] %{SPACE}-%{SPACE}%{GREEDYDATA:mdc}%{SPACE}-%{SPACE} %{GREEDYDATA:themessage}(?:\n+(?<stacktrace>(?:.|\r|\n)+))? @xeraa
Pro: No change Con: RegEx, timestamp, multiline @xeraa
Send @xeraa
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Pro: No files Con: Outages & coupling @xeraa
Structure @xeraa
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Pro: Right format Con: JSON serialization overhead @xeraa
Containerize @xeraa
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https://turnoff.us/geek/beforedevops-after-devops/
Where to put Filebeat? Sidecar @xeraa
Default JSON log filebeat.prospectors: - type: log paths: - "/var/lib/docker/containers//.log" json.message_key: log json.keys_under_root: true processors: - add_docker_metadata: ~ @xeraa
Metadata { "host": "10.4.15.9", "port": 6379, "docker": { "container": { "id": "382184ecdb385cfd5d1f1a65f78911054c8511ae009635300ac28b4fc357ce51", "name": "my-java", "image": "my-java:1.0.0", "labels": { "app": "java" } } } } @xeraa
Mount log path my-java: container_name: my-java hostname: my-java build: ${PWD}/config/my-java networks: ['stack'] command: java -jar my-java.jar volumes: - ./logs/my-java/:/opt/my-java/logs/ filebeat: container_name: filebeat hostname: filebeat image: "docker.elastic.co/beats/filebeat:${ELASTIC_VERSION}" volumes: - ./logs/my-java/:/var/log/my-java/ - ./docker-compose/filebeat.yml:/usr/share/filebeat/filebeat.yml:ro command: filebeat -e networks: ['stack'] @xeraa
Registry file filebeat.registry_file: /usr/share/filebeat/data/registry @xeraa
..-__ ''-._ _.-.. ''-._ .-.-```. ```\/ _.,_ ''-._ ( ' , .-` | `, ) |`-._`-...-` __...-.-.|'_.-'| |-.._ / _.-' |-._ -._-./ .-' .-' |-._-.-.__.-' _.-'_.-'| |-.-._ _.-'_.-' |-._ -._-..-'.-' .-' |-._-.-.__.-' _.-'_.-'| |-.-._ _.-'_.-' |-._ -._-..-'_.-' _.-' -._-..-' _.-' -._ _.-'-..-'
Redis 4.0.9 (00000000/0) 64 bit Running in stand alone mode Port: 6379 PID: 55757
http://redis.io
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Configuration templates filebeat.autodiscover: providers: - type: docker templates: - condition: equals: docker.container.image: redis config: - type: docker containers.ids: - "${data.docker.container.id}" exclude_lines: ["^\s+[\-`('.|_]"] @xeraa
Drop asciiart lines
Pro: Hot Con: Complexity @xeraa
Orchestrate @xeraa
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Where to put Filebeat? DaemonSet @xeraa
Metadata processors: - add_kubernetes_metadata: in_cluster: true @xeraa
Metadata { "host": "172.17.0.21", "port": 9090, "kubernetes": { "container": { "id": "382184ecdb385cfd5d1f1a65f78911054c8511ae009635300ac28b4fc357ce51", "image": "my-java:1.0.0", "name": "my-java" }, "labels": { "app": "java", }, "namespace": "default", "node": { "name": "minikube" }, "pod": { "name": "java-2657348378-k1pnh" } }, } @xeraa
Configuration templates filebeat.autodiscover: providers: - type: kubernetes templates: - condition: equals: kubernetes.namespace: redis config: - type: docker containers.ids: - "${data.kubernetes.container.id}" exclude_lines: ["^\s+[\-`('.|_]"] # Drop asciiart lines @xeraa
Customize indices output.elasticsearch: index: "%{[kubernetes.namespace]:filebeat}-%{[beat.version]}-%{+yyyy.MM.dd}" @xeraa
Pro: Hot Con: Complexity++ @xeraa
Conclusion @xeraa
Examples https://github.com/xeraa/java-logging @xeraa
Parse Send Structure Containerize Orchestrate @xeraa
Most organizations feel the need to centralize their logs. Once you have more than a couple of servers or containers, SSH and tail will not serve you well any more. However, the common question or struggle is how to achieve that.
Video
Resources
The following resources were mentioned during the presentation or are useful additional information.
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GitHub: Demo Code
How to log from a Java application to the Elastic Stack.
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