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DevopsdaysIndia 2018: Loki, Prometheus but for logs
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Goutham Veeramachaneni
December 09, 2018
Programming
1
2k
DevopsdaysIndia 2018: Loki, Prometheus but for logs
Goutham Veeramachaneni
December 09, 2018
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Transcript
Loki Like Prometheus, but for logs Goutham Veeramachaneni @gouthamve DevOpsDaysIndia
2018
putadent gouthamve
QQQ
Outline • Quick Grafana intro • Full observability • Loki
• The future
Grafana intro
Grafana From Dashboarding solution To Observability platform
Unified way to look at data from different sources Logos
of datasources
Full Observability Picture credits: Peter Bourgon
Troubleshooting journey
Instrumenting an app
App • Classic 3-tiered app • Deployed in Kubernetes •
It’s running, but how is it doing? Load balancers App servers DB servers
Add instrumentation • Prometheus for metrics • Loki for logs
• Jaeger for traces
Change app • Introduce a bug • Let’s debug this
with our new tools
Demo: http://localhost:3000/explore
Loki: Grafana logging in detail
Goal: Keeping it simple https://twitter.com/alicegoldfuss/status/981947777256079360
Logs should be cheap! Existing Solutions are hard to scale
and operate You don’t need full text search / indexing Metrics, Logs and Traces need to work together More Goals
Logging for Kubernetes {job=”app1”} {job=”app3”} {job=”app2”}
Logging for Kubernetes (2) {job=”app1”} {job=”app3”} {job=”app2”}
Service Discovery for Grafana Logging • Prometheus-style service discovery of
logging targets • Labels are indexed as metadata, e.g.: {job=”app1”} • Relabeling rules
Logging architecture {job=”app1”} {job=”app2”} Node Logging agent Logging service Logging
datasource
Logging architecture {job=”app1”} {job=”app2”} Node Promtail Loki Logging datasource
Loki: Architecture Your jobs Distributor Ingester Index Chunks Querier
Loki: Write Path Your jobs Distributor Ingester Index Chunks
Distributor Distributor Ingester Use consistent hashing to assign a timestream
to an ingester.
Loki: Write Path Ingester {job=”app1”, instance=”...”,..} {job=”app2”, instance=”...”,..} Log line
Loki: Write Path Ingester {job=”app2”, instance=”...”,..} Index Chunks
Loki: Read Path Ingester Index Chunks Querier
Loki: Scalability Index Chunks Bigtable DynamoDB Cassandra BOLTDB GCS S3
Ceph / Minio FILES Distributor Ingester Querier
Loki: Status • Alpha software • Focus on correctness, ease-of-use
first, performance later • Onboard paying customers in Q1 2019 • Beyond Kubernetes
• Cheap but not free :) • Grep + Parsing
in browser • Can’t do complicated queries Loki: Caveats
What we’re working on
Enable Explore UI (BETA: Prometheus) Behind feature flag. To enable,
edit Grafana config ini file [explore] enabled = true Set up a datasource that supports Explore, e.g., Prometheus. Will be released in 6.0 (Feb 2019)
Integrate Tracing • Associate traces with logs and metrics •
Labels FTW • Aiming for Q2 2019
Logging UI needs to be refined still behind feature flag,
feedback welcome: @davkals or
[email protected]
UX improvements on logs and metrics views Performance improvements
One last thing...
https://www.grafanacon.org/2019/
Tack for listening Questions to
[email protected]
@putadent