The Art of Container Monitoring. Derek Chen
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1 The Art of Container Monitoring Derek Chen
2 About me DevOps Engineer at Trend Micro Agile transformation Micro service and cloud service Docker integration Monitoring system development Automate all the things Make everything smoother Find me at 2
3 Why monitoring? We want to know when things go wrong We want to know when things aren t quite right We want to know in advance of problems Microscope? Magnifier? Telescope? 3
4 Blackbox vs Whitebox Blackbox Requires no participation of the monitored system Observes external functionality, what the user see End to end test Whitebox Collects data internally provided by the target system Has more granular information about the system Can provide warning of problems before they occur 4
5 Blackbox tests measure Can you ping the server Can you fetch a page from the server Does it have the correct contents Whitebox monitoring collects Network statistics (packets/bytes sent/received) System load (cpu, memory, disk usage) Application statistics (connection count, query per second) 5
6 Goal Be metric, event, and log Allow us to easily visualize the stat of our environment Provide contextual and useful notification. Focus on whitebox monitoring instead of blackbox monitoring Router Metrics Events Logs Destinations Store Visualize Alert Business Logic Application Operating System Monitoring Framwork [image] 6
7 Why Open Source Software Monitoring? The practice of system admin is changing quickly DevOps Infrastructure as Code Visualization Cloud Platform Commercial solution can t keep up! [image] 7
8 Monolithic If all-in-one gets the job done, then great Good for smaller scale, non-tech-focused companies Modular DevOps requires flexibility and innovation Good for tech driven and ops-focused companies 8
9 Metric We ll rely most heavily on metrics to help us understand what s going on in our environment.
10 Metric Provide a dynamic, real-time picture of the state of your infrastructure Business Logic Collect Store Visualize Application Operating System 10
11 Pull Mode A central collector periodically requests metrics from each monitored system Push Mode Metrics are periodically sent by each monitored system to a central collector Server #1 Server #1 Service Scrape Metrics Agent Push Metrics Server #2 Service Monitoring Server #2 Agent Monitoring Server #3 Server #3 Service Agent 11
12 Collectd The system statistics collection daemon
13 Host Machine OS Metric Monitor InfluxDB Grafana Kubernetes Cluster Collectd K8S Master Database Elasticsearch K8S Minion K8S Minion Collectd Collectd Collectd Collectd 13
14 cadvisor Collects, aggregates, processes, and exports information about running containers.
15 Container OS Metric Monitor InfluxDB Grafana Kubernetes Cluster K8S Master API Server cadvisor Database Elasticsearch K8S Minion K8S Minion Heapster cadvisor cadvisor 15
16 16
17 Telegraf Collects time series data from a variety of sources
18 Application Metric Pull Mode Telegraf Monitor InfluxDB Grafana Kubernetes Cluster API Server K8S Master Database Elasticsearch K8S Minion K8S Minion Postgres ES Nginx Redis 18
19 Application Metric Push Mode Monitor InfluxDB Grafana Kubernetes Cluster API Server K8S Master Database Elasticsearch K8S Minion K8S Minion Postgres Telegraf ES Telegraf Nginx Telegraf Pod Redis Telegraf Pod 19
20 Telegraf An agent written in Go Easy to contribute or develop your plugins Supported Input Plugins System: cpu, mem, net, disk, processes and etc. Application: docker, nginx, postgresql, redis, and etc. Third party api: aws cloudwatch Supported output plugins influxdb, graphite, cloudwatch, datadog and etc. 20
21 Pull Mode Collector discoveries services periodically Collector needs to talk to target services Overlay network. Ex: Flannel, Weave, etc. Forward proxy Server #1 Service Server #2 Service Server #3 Service Scrape Metrics Monitoring 21
22 Push Mode Agent sends metrics as soon as it starts up Suitable for short-lived containers or dynamic environments Server #1 Agent Server #2 Agent Server #3 Agent Push Metrics Monitoring 22
23 InfluxDB Time series database stores all the metrics
24 Similar scope to Graphite Written in Go No external dependency Ready for billions row Several client libraries SQL style queries 24
25 InfluxDB Schema Measurements (e.g. cpu, mem, disk, net, nginx) Timestamp (nano second) Tags (e.g. app=atom-apigw namespace=alpha) Fields (e.g. accepts=30925, active=1, handled=30925) 25
26 InfluxDB Schema Measurements (e.g. cpu, mem, disk, net, nginx) Timestamp (nano second) Tags (e.g. app=atom-apigw namespace=alpha) Fields (e.g. accepts=30925, active=1, handled=30925) 26
27 InfluxDB Schema Measurements (e.g. cpu, mem, disk, net, nginx) Timestamp (nano second) Tags (e.g. app=atom-apigw namespace=alpha) Fields (e.g. accepts=30925, active=1, handled=30925) 27
28 InfluxDB Schema Measurements (e.g. cpu, mem, disk, net, nginx) Timestamp (nano second) Tags (e.g. app=atom-apigw namespace=alpha) Fields (e.g. accepts=30925, active=1, handled=30925) 28
29 InfluxDB Schema Measurements (e.g. cpu, mem, disk, net, nginx) Timestamp (nano second) Tags (e.g. app=atom-apigw namespace=alpha) Fields (e.g. accepts=30925, active=1, handled=30925) 29
30 Grafana Querying and visualizing time series and metrics
31 Finally! What we can to see! Less talk more demo
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35 35
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37 37
38 Event We ll generally use events to let us know about changes and occurrences in our environment.
39 Icinga2 A monitoring system which checks the availability of your resources, notifies users of outages
40 Originally forked from Nagios in 2009 Independent version Icinga2 since 2014 Monitors everything Gathering status Collect performance data /use/lib/nagios/plugins/plugin_name Any program which returns 0 OK 1 WARNING 2 CRITICAL Message to STDOUT 40
41 Event Monitoring Monitor Kubernetes Cluster K8S Master Icinga2 InfluxDB Grafana API Server Database Elasticsearch K8S Minion K8S Minion Postgres ES Nginx Redis 41
42
43 43
44 Pod Host 44
45 Server Monitoring About changes and occurrences in our environment Is cpu load too high? Is memory not enough? Is docker engine still alive? External Monitoring End to end test from user s perspective Can you connect ssh port 22? Can you browse web page? Can you request RESTful API successfully? 45
46 Dashboard Provides a clear view for current environment Alerting Notifies using , slack, pager and etc. Notification escalation Others Distributed Monitoring Reloads config without interrupt checks
47 Log Logs are a subset of events. They re often most useful for fault diagnosis and investigation
48 EFK EFK stack is a mature logging solution Shipping all of your log to where it should go The main part to store your data with high availability Visualize will power your data. To know more about its value. 48
49 Summary
50 Monitoring Service Stack Collect Store Visualize Alert Collectd cadvisor InfluxDB Grafana Icinga2 Telegraf Fluentd Elasticserach Kibana 50
51 Last but Not least Data Flow Blackbox vs Whitebox Pull Mode vs Push Mode Data Content Opeating System, Application, Business Logic Data Type Metric, Events, Logs [image] Router Metrics Events Logs Destinations Store Visualize Alert Business Logic Application Operating System Monitoring Framwork 51
52 THANKS! Any Questions?
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