Docker monitoring tools include: 1. cAdvisor; 2. Docker stats; 3. Sysdig; 4. ManageEngine Applications Manager; 5. Prometheus; 6. Dynatrace; 7. Sensu, etc.
The operating environment of this tutorial: linux5.9.8 system, docker-1.13.1 version, Dell G3 computer.
Container monitoring plays a very important role for developers because it can monitor running applications and ensure that the container reaches its expected goals. This helps identify problems early and resolve them quickly. Today I will introduce to you 7 excellent Docker container monitoring tools. Let’s take a look.
1. cAdvisor
cAdvisor is an open source tool for monitoring Docker containers. But compared to the CLI-based Docker Stats mentioned below, cAdvisor also provides a GUI for viewing API information. In cAdvisor, isolation of shared resources used by multiple container applications is based on lmctfy's API.
2. Docker stats
To monitor the resource usage of Docker containers, the easiest way is to use the Docker stats CLI command. It is an open source default API available in the Docker daemon and provides resource usage statistics of running Docker containers based on CPU, RAM, network and block I/O usage.
3. Sysdig
Sysdig is the most widely used container monitoring tool, providing support for alerts, data aggregation and visualization. The best feature of sysdig is that it can not only analyze the "live" status of a Linux system, but also save that status as a dump file for offline inspection. What's more, you can customize the behavior of sysdig, or even enhance its capabilities via a built-in (or you can write your own) little script called chisel. A separate chisel can analyze the event stream captured by sysdig in various styles specified by the script.
4. ManageEngine Applications Manager
ManageEngine Applications Manager is an application monitor that can monitor Docker. The software provides information about containers in a Docker host, including metrics for CPU, disk usage, availability, and health. This information can be viewed in graphical form to monitor Docker's availability or performance history over a predefined period of time.
5. Prometheus
Prometheus is an open source version of the open source monitoring system developed by SoundCloud. In 2016, the Linux Foundation, launched by Google, included Prometheus as its second largest open source project. Prometheus is also very active in the open source community. Compared with Docker Stats and cAdvisor, Prometheus also provides an alert mechanism based on some application rules. It utilizes the exporter API to capture and store container metrics.
6. Dynatrace
Dynatrace is an easy-to-configure application and performance monitoring solution. You need to install Dynatrace on the Docker host. Once completed, the next step is for the program to automatically discover containers and microservices. After the platform has completed discovering your infrastructure, the containerization process can be viewed in real time via the dashboard. The software can also monitor the performance of applications and microservices within containers.
7. Sensu
Sensu is a monitoring framework mainly used for inspection and monitoring of cloud computing platforms with large-scale nodes. There are currently two versions released: enterprise version and open source version. Sensu can provide support for three container technologies: LXC, Docker and RKT. Sensu is self-hosted and provides centralized metrics services. However, in a production environment, Sensu deployment depends on various supplementary services, such as Sensu API and Sensu Core.
Recommended learning: "docker video tutorial"
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