Host Health Monitoring with Docker Run
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In this presentation I offer an overview of host monitoring over the years, then explain how Docker and container schedulers truly improve the state of the art for failure monitoring and recovery.
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Host Health Monitoring with Docker Run
- 1. Host Health Monitoring with `docker run` Noah Zoschke @nzoschke noah@convox.com 10 / 28 / 2015
- 2. Health Monitoring circa 1999 • Nagios Core • Event scheduler • Event processor • Alert manager • Host groups config • Ping • HTTP • SSH • Nagios Remote Plugin Executor • SNMP • load • disk photo credit: https://en.wikipedia.org/wiki/Nagios
- 3. Health Monitoring circa 2012 • AMI • Chef / Ansible • ELB / Health Check • Protocol: HTTP (or HTTPS, TCP, SSL) • Port: 80 • Path: /index.html • Timeout / Interval: 5s / 30s • Unhealthy / Healthy Threshold: 2 / 10 • EC2 / Status Checks • Loss of network • Loss of power • Host software problems • Host hardware problems • ASG photo credit: http://aws.amazon.com/architecture/ http://blog.domenech.org/2012/11/aws-ec2-auto-scaling-basic-configuration.html
- 4. But you probably still need… • Nagios for monitoring • or Zabbix, Ganglia, Sensu… • or OpsView, SolarWinds… • or Pingdom, Datadog… • To provide system feedback • ASG SetInstanceHealth photo credit: http://itomibhaa.deviantart.com/art/Who-watches-the-Watchmen-276285938
- 5. Health Monitoring circa 2016, the age of containers • Generic AMI • Docker • ECS • Container scheduling and re-scheduling as a service • ASG / EC2 / Status Checks • Simple monitoring container photo credit: https://github.com/docker/swarm
- 6. ecs-agent dockerd ecs-agent dockerd ecs-agent dockerd api 128 MB registry 256 MB rails web.2 1024 MB data worker.1 512 MB rails web.3 1024 MB data worker.2 512 MB rails worker.2 256 MB rails worker.3 256 MB rails web.1 1024 MB rails worker.1 256 MB rails worker.4 256 MB ECS ASG api ELB rails ELB
- 7. ecs-agent dockerd ecs-agent dockerd ecs-agent dockerd api 128 MB registry 256 MB rails web.2 1024 MB data worker.1 512 MB rails web.3 1024 MB data worker.2 512 MB rails worker.2 256 MB rails worker.3 256 MB rails web.1 1024 MB rails worker.1 256 MB rails worker.4 256 MB ECS ASG api ELB rails ELB Failure Scenarios • web.2 container crashes • web.2 port unresponsive • ecs-agent fails • dockerd fails • Instance hardware fails • Instance fails to register with ECS • Instance userspace gets wacky
- 8. Failure Scenarios • web.2 container crashes • web.2 port unresponsive • ecs-agent fails • dockerd fails photo credit: http://paper-replika.com/index.php?option=com_content&view=article&id=76&Itemid=207693 > reschedule task
- 9. Container Schedulers are the new watchman • Container process monitoring • Service health check monitoring • Automatic re-scheduling photo credit: http://docs.aws.amazon.com/AmazonECS/latest/developerguide/task_life_cycle.html
- 10. ecs-agent dockerd ecs-agent dockerd ecs-agent dockerd api 128 MB registry 256 MB rails web.2 1024 MB data worker.1 512 MB rails web.3 1024 MB data worker.2 512 MB rails worker.2 256 MB rails worker.3 256 MB rails web.1 1024 MB rails worker.1 256 MB rails worker.4 256 MB ECS ASG api ELB rails ELB Failure Scenarios • web.2 container crashes • web.2 port unresponsive • ecs-agent fails • dockerd fails • Instance hardware fails • Instance fails to register with ECS • Instance userspace gets wacky Still need to configure an ASG to maintain capacity…
- 11. ecs-agent dockerd ecs-agent dockerd ecs-agent dockerd api 128 MB registry 256 MB rails web.2 1024 MB data worker.1 512 MB rails web.3 1024 MB data worker.2 512 MB rails worker.2 256 MB rails worker.3 256 MB rails web.1 1024 MB rails worker.1 256 MB rails worker.4 256 MB ECS ASG api ELB rails ELB Failure Scenarios • web.2 container crashes • web.2 port unresponsive • ecs-agent fails • dockerd fails • Instance hardware fails • Instance fails to register with ECS • Instance userspace gets wacky Still need a monitor…
- 12. ecs-agent dockerd ecs-agent dockerd ecs-agent dockerd api 128 MB registry 256 MB rails web.2 1024 MB data worker.1 512 MB rails web.3 1024 MB data worker.2 512 MB rails worker.2 256 MB rails worker.3 256 MB rails web.1 1024 MB rails worker.1 256 MB rails worker.4 256 MB ECS ASG api ELB rails ELB Health Monitoring circa 2016, the age of containers • Schedule a monitor process in container cluster • Describe ASG an ECS membership • Mark all instances unregistered with ECS unhealthy • `docker run` a user space health check on every instance • Mark instances that fail to connect to Docker unhealthy • Mark instances that fail user space health check unhealthy No Nagios server + plugins!
- 13. Partial Failure Scenarios battle scars • web.2 container crashes • web.2 port unresponsive • ecs-agent fails • dockerd fails • Instance hardware fails • Instance fails to register with ECS • Instance userspace gets wacky • Disk full • Disk partition corrupt / read-only • Network packet loss • CPU steal • Kernel bugs triggered • Security vulnerabilities • Security breaches • …
- 14. User Space Health Check $ docker run busybox sh -c 'dmesg | grep "Remounting filesystem read-only"' # why not: $ docker run health-check To package, distribute and run common top, netstat, smartmontools, etc. binaries and scripts
- 15. Thanks! Slides available on Medium / SlideShare https://medium.com/@nzoschke/host-health-monitoring-with-docker-run-46315eb38286 http://www.slideshare.net/nzoschke/host-health-monitoring-with-docker-run Open source Golang monitor available on GitHub https://github.com/convox/rack/blob/master/api/workers/cluster.go Questions / feedback to @nzoschke or noah@convox.com