Docker metrics
by Scott Gallagher, Allan Espinosa, Russ McKendrick, Santosh Kumar Konduri, Vaibhav
Docker: Creating Structured Containers
- Docker
- Table of Contents
- Docker
- Meet Your Course Guide
- 1. Course Module 1: Learning Docker
- 1. Getting Started with Docker
- An introduction to Docker
- Docker on Linux
- Differentiating between containerization and virtualization
- Docker networking/linking
- Installing Docker
- Downloading the first Docker image
- Running the first Docker container
- Running a Docker container on Amazon Web Services
- Troubleshooting
- 2. Up and Running
- Docker terminologies
- Docker commands
- The daemon command
- The version command
- The info command
- The run command
- The search command
- The pull command
- The start command
- The stop command
- The restart command
- The rm command
- The ps command
- The logs command
- The inspect command
- The top command
- The attach command
- The kill command
- The cp command
- The port command
- Running your own project
- Dockerfile
- 3. Container Image Storage
- 4. Working with Docker containers and images
- 5. Publishing Images
- 6. Running Your Private Docker Infrastructure
- 7. Running Services in a Container
- 8. Sharing Data with Containers
- 9. Docker Machine
- 10. Docker Compose
- 11. Docker Swarm
- 12. Testing with Docker
- 13. Debugging Containers
- 1. Getting Started with Docker
- 2. Course Module 2: Networking Docker
- 1. Docker Networking Primer
- 2. Docker Networking Internals
- 3. Building Your First Docker Network
- 4. Networking in a Docker Cluster
- 5. Next Generation Networking Stack for Docker – libnetwork
- 3. Course Module 3: Monitoring Docker
- 1. Introduction to Docker Monitoring
- 2. Using the Built-in Tools
- 3. Advanced Container Resource Analysis
- 4. A Traditional Approach to Monitoring Containers
- 5. Querying with Sysdig
- 6. Exploring Third Party Options
- 7. Collecting Application Logs from within the Container
- 8. What Are the Next Steps?
- 4. Course Module 4: Securing Docker
- 1. Securing Docker Hosts
- 2. Securing Docker Components
- 3. Securing and Hardening Linux Kernels
- 4. Docker Bench for Security
- Docker security – best practices
- Docker – best practices
- CIS guide
- The Docker Bench Security application
- Running the tool
- Understanding the output
- Understanding the output – host configuration
- Understanding the output – the Docker daemon configuration
- Understanding the output – the Docker daemon configuration files
- Understanding the output – container images and build files
- Understanding the output – container runtime
- Understanding the output – Docker security operations
- 5. Monitoring and Reporting Docker Security Incidents
- 6. Using Docker's Built-in Security Features
- 7. Securing Docker with Third-Party Tools
- 8. Keeping up Security
- 5. Course Module 5: Mastering Docker
- 1. Docker in Production
- 2. Shipyard
- 3. Panamax
- 4. Tutum
- 5. Advanced Docker
- A. Reflect and Test Yourself! Answers
- Module 1: Learning Docker
- Chapter 1: Getting Started with Docker
- Chapter 6: Running Your Private Docker Infrastructure
- Chapter 7: Running Services In a Container
- Chapter 8: Sharing Data with Containers
- Chapter 9: Docker Machine
- Chapter 10: Orchestrating Docker
- Chapter 11: Docker Swarm
- Chapter 12: Testing with Docker
- Chapter 13: Debugging Containers
- Module 2: Networking Docker
- Module 3: Monitoring Docker
- Module 4: Securing Docker
- Chapter 2: Securing Docker Components
- Chapter 3: Securing and Hardening Linux Kernels
- Chapter 4, Docker Bench for Security
- Chapter 5, Monitoring and Reporting Docker Security Incidents
- Chapter 6, Using Docker's Built-in Security Features
- Chapter 7, Securing Docker with Third-party Tools
- Chapter 8, Keeping up Security
- Module 5: Mastering Docker
- Module 1: Learning Docker
- B. Bibliography
- Index
For each container, Zabbix discovers the following metrics that will be recorded:
- Container (your Containers name) is running
- CPU system time
- CPU user time
- Used cache memory
- Used RSS memory
- Used swap
Apart from "Used swap", these are the same metrics recorded by cAdvisor.
You can access a time-based graph for any of the metrics collected by Zabbix; you can also create your own custom graphs. In the following graph, I have created a graph that plots all the CPU System stats from the three web containers we launched earlier in the chapter:
As you can see, I performed a few tests using ApacheBench to make the graph a little more interesting.
For more information on how to create custom graphs, see the graphs section of the documentation site at https://www.zabbix.com/documentation/2.4/manual/config/visualisation/graphs.
As we added the Linux OS template and the Docker template to the host and we are also recording quite a lot of information about the system, here we can tell the effect the testing with ApacheBench had on the overall processor load:
We can drill down further to get information on the overall utilization:
Another feature of Zabbix is triggers: you can define actions to happen when a metric meets a certain set of criteria. In the following example, Zabbix has been configured with a trigger called Container Down; this changes the status of the monitored item to Problem with a severity of Disaster:
This change in status then triggers an e-mail to inform that, for some reason the container is no longer up and running:
This could have also triggered other tasks, such as running a custom script, sending an instant message via Jabber, or even triggering a third-party service such as PagerDuty (https://www.pagerduty.com) or Slack (https://slack.com).
For more information on Triggers, Events, and Notifications, see the following sections of the documentation:
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