Docker Monitoring Webinar
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For the Docker users out there, Sematext's DevOps Evangelist, Stefan Thies, goes through a number of different Docker monitoring options, points out their pros and cons, and offers solutions for Docker monitoring. Webinar contains actionable content, diagrams and how-to steps.
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Docker Monitoring Webinar
- 1. Docker Monitoring Webinar 20% OFF 201509WNR20S 201509WNR20L sematext.com/spm sematext.com/logsene
- 3. Intro SPM: Performance monitoring, Anomaly Detection and Alerting Logsene: Centralized Log Management Search and Big Data Consulting Support for Solr and Elasticsearch
- 4. Agenda ● Docker Monitoring ○ Docker Monitoring Basics ○ Deployment Options for Docker Agents ● Application Monitoring on Docker ○ Monitoring Containerized Applications ○ Deployment Options for Application Monitoring Agents
- 5. Why we like Blue Whales ● Portable packaging ● Optimized resource usage ● Configurable resource limits ● Isolated environment for apps
- 6. What is Docker made of?
- 8. Docker Challenges ● New workflows for deployments ○ from developer laptop straight to the Cloud ● Orchestration of applications ● Logging ○ Webinars 29/30 September, @sematext ● Monitoring
- 9. Docker Monitoring Basics Let’s understand what we monitor!
- 10. Why Docker Monitoring You can’t fix problems you don’t see! ● Tuning ○ Resources / Container Limits ○ Application Performance ● Quality assurance ● Capacity planning ● Availability / SLA’s
- 11. What to monitor? Cluster Server 1 Container 1 Container 2 Container N Container 1 Elasticsearch Container 2 Node.js - web service Container N NGINX - reverse proxy Server N JVM Runtime Env JS Runtime Env
- 12. The Metrics Stack Changed! Server Metrics Runtime Metrics App Metrics Server Metrics Runtime Metrics App Metrics Container Metrics Runtime Metrics = JVM Metrics or Node.js Metrics, … Without Docker With Docker
- 13. Poll What is the result of ‘vmstat’ when started in a container? A) OS Metrics limited to the container B) OS Metrics from the docker host
- 14. Docker Stats Command > docker stats $(docker ps -q) CONTAINER CPU % MEM USAGE/LIMIT MEM % NET I/O 19a9f4c9ecb7 0.00% 1.421 MB/3.944 GB 0.04% 0 B/0 B 7f043a32307c 0.00% 1.413 MB/3.944 GB 0.04% 0 B/0 B 889646bd003f 0.11% 4.235 MB/3.944 GB 0.11% 0 B/0 B 9a29f494bf7d 0.27% 156.8 MB/3.944 GB 3.98% 0 B/0 B Too simple!
- 15. Docker API for Metrics > echo -e "GET /containers/3236f3328bbd/stats HTTP/1.0rn" | nc -U /var/run/docker.sock HTTP/1.0 200 OK Date: Thu, 30 Jul 2015 08:37:31 GMT Content-Type: text/plain; charset=utf-8 {"read":"2015-07-30T04:37:31.13789208-04:00","network":{"rx_bytes":636450,"rx_packets":1944," rx_errors":0,"rx_dropped":0,"tx_bytes":495897,"tx_packets":2415,"tx_errors":0,"tx_dropped":0}," precpu_stats":{"cpu_usage":{"total_usage":0,"percpu_usage":null,"usage_in_kernelmode":0," usage_in_usermode":0},"system_cpu_usage":0,"throttling_data":{"periods":0,"throttled_periods": 0,"throttled_time":0}},"cpu_stats ... Too verbose! More than 70 Metrics are exposed
- 16. Watching a Metric > echo -e "GET /containers/3236f3328bbd/stats HTTP/1.0rn" | nc -U /var/run/docker.sock | logagent -y | grep rx_bytes rx_bytes: 667326 rx_bytes: 667354 rx_bytes: 667413 rx_bytes: 667538 github.com/sematext/logagent-js Which Metrics are most relevant?
- 18. Server Metrics ● CPU ● Memory Usage ● Disk Space ○ Docker Images consume a lot of disk space
- 19. Container Metrics ● Containers CPU + Throttled CPU time / CPU limits! ● Memory Limits + Memory Allocation Fail Counters ● Disk I/O + Wait Times ● Network I/O + Network Errors
- 20. Docker Key Metrics in SPM
- 21. Beyond Metrics: Events ● Docker Events ○ container auditing ○ create, destroy, die, export, kill, pause, restart, start, stop, unpause, oom
- 22. Beyond Metrics: Logs ● Logs ○ Docker collects console output of each container ○ API or Log Drivers for forwarding ● Correlation with Metrics ○ Faster troubleshooting blog.sematext.com/2015/08/11/docker-logging-webinar/ Docker Logging Webinar
- 24. Directly on each Docker Host ● The traditional way! ● Full access to the operating system ● Limitations in ’Container only’ systems - CoreOS - RancherOS - Many PaaS Solutions, e.g., DEIS
- 25. One Container on each Docker Host ● Yes. The Docker Way! ● Portable to any ‘Docker platform’ ● Requirements: - Access to the Host Metrics + Docker API - Extended privileges (e.g., for SELinux, GCE,...)
- 27. SPM for Docker Monitoring apps.sematext.com/spm-reports/registerApplication.do hub.docker.com/r/sematext/spm-agent-docker/ github.com/sematext/spm-agent-docker
- 28. Example 1: Run SPM for Docker docker run -d --name spm-agent -v /var/run/docker.sock:/var/run/docker.sock -e SPM_TOKEN=fe31fc3a-xxxx-47c6-b83c-be376bfxxx -e HOSTNAME=$HOSTNAME -e SPM_MONITORING_TAGS="project:dev-test,role:demo" -e LOGSENE_TOKEN=53a6c7e7-xxxx-4725-962e-ea47cebxxx --privileged sematext/spm-agent-docker
- 29. Example 2: CoreOS + DEIS ● CoreOS has no package manager ● systemd - init system ● fleet - as distributed init system ● etcd - for central configurations How to distribute a Monitoring Agent to all CoreOS servers in a cluster?
- 30. Example 2
- 31. Example 2: Distribute the Agent # Configure SPM app token etcdctl set /sematext.com/myapp/spm/token YOUR_SPM_TOKEN # Download the fleet unit file for SPM wget https://raw.githubusercontent.com/sematext/spm-agent-docker/master/coreos/spm-agent.service -O spm-agent.service # Start SPM Agent in the whole cluster fleetctl load spm-agent.service fleetctl start spm-agent.service
- 32. Example 3: RANCHER OS ● Minimalistic (~25 MB !) ● No package manager ● All system services are containers ● No cluster manager (by default) ● Use restart policy ‘always’ for services docker run --restart=always … sematext/spm-agent-docker
- 35. How are Applications monitored? ● Standalone Agents ○ Remote interface: JMX, MySQL, NGINX, Apache ○ No restart required, when agent gets updated ● In-Process Agents ○ Resource friendly ○ Node.js ○ JVM Apps (Elasticsearch, Solr, Kafka, ...) - Function Transaction/Call Tracing possible
- 36. Transaction Tracing + AppMap ● Only possible with in-process monitoring
- 37. Deployment Options for Application Monitoring … on Docker
- 38. Everything in Each Container
- 39. Standalone in Separate Container
- 40. In-Process in Separate Container
- 41. Setup for Elasticsearch Image spm-client: image: sematext/spm-client # Exports Volume /opt/spm container_name: spm-client environment: - SPM_CFG="${SPM_TOKEN} es javaagent jvmname:ES1" ELASTICSEARCH: image: elasticsearch ports: - "9200:9200" volumes_from: - spm-client environment: # inject in-process monitor from SPM client volume /opt/spm - ES_JAVA_OPTS="-Dcom.sun.management.jmxremote -javaagent:/opt/spm/spm-monitor/lib/spm-monitor-es.jar=${SPM_TOKEN}::ES1"
- 42. Setup for node.js Apps Dockerfile: FROM nodejs RUN git clone my/app RUN npm i RUN npm i spm-agent-nodejs CMD node -r spm-agent-nodejs app.js --- docker build -t myapp . docker run -e SPM_TOKEN=43A... myapp
- 43. Application + Docker Metrics
- 44. SPM Logsene METRICS + LOGS ⇒ BETTER TOGETHER
- 46. Docker Monitoring Webinar 20% OFF 201509WNR20S 201509WNR20L sematext.com/spm sematext.com/logsene
- 47. Thank you for your attention