There are several ways to monitor Docker containers in real time:
- docker logs : View the logs of a running container.
- docker attach : Attach to a running container and view its output.
- docker top : View the running processes of a container.
docker ps -a command to list all containers, including the stopped ones: If you want to see all containers, add a keyword with the 'docker ps' command, i.e., '-a'. This command will show you all containers, whether they are running, restarting, paused, or stopped.The most straightforward way to list containers in Docker is by using the “docker ps” command. This command lists all the running containers on your Docker host. This will display a table with information about the running containers, such as the container ID, image used, command, and status.
What is the command to check the Docker : To check if you have Docker installed, run command docker ps or docker info on a terminal screen to verify it is installed and running.
How do we monitor containers
Container monitoring solutions use metric capture, analytics, transaction tracing and visualization. Container monitoring covers basic metrics like memory utilization, CPU usage, CPU limit and memory limit. Container monitoring also offers the real-time streaming logs, tracing and observability that containers need.
How do I monitor container logs : Here are some of the most common techniques for collecting logs from containerized environments.
- Logging via Docker Logging Drivers.
- Direct vs. Non-blocking Log Delivery.
- Logging via the Application.
- Persisting Logs Using Data Volumes.
- Using a Dedicated Logging Container.
You can use the docker stats command to live stream a container's runtime metrics. The command supports CPU, memory usage, memory limit, and network IO metrics. The docker stats reference page has more details about the docker stats command.
Docker provides the docker exec command to launch applications in already running containers. It enables you to launch a session within the container's default directory.
How do I see all docker images
We have to use the docker image list command to list Docker images that are locally available on the host on which we are running the command. 'ls' and 'images' are aliases for this command, which means we can also run the command 'docker image ls' or 'docker images' to list the Docker images.List of 57 Essential Docker Commands
| Command | Usage |
|---|---|
| docker pull | Pull an image or a repository from a registry |
| docker push | Push an image or a repository to a registry |
| docker rename | Rename a container |
| docker restart | Restart one or more containers |
One way to attach to a running Docker container is by using the docker attach command. This command will attach the container's standard input, output, and error streams to your local terminal.
10 Best Container monitoring tools in 2024
- Middleware (Free Container Monitoring Tool)
- Sematext.
- Prometheus & Grafana (open-source Docker container monitoring tool stack)
- SigNoz (open-source)
- Datadog.
- Dynatrace.
- SolarWinds Server & Application Monitor.
- Sysdig.
How to monitor docker resource usage : You can use the docker stats command to live stream a container's runtime metrics. The command supports CPU, memory usage, memory limit, and network IO metrics. The docker stats reference page has more details about the docker stats command.
How to check docker container log : Docker Command for Checking Container Logs
Replace container_id with the ID number of the container you want to inspect. To find the container ID, use the docker ps command to list running containers. As in the image below, Docker responds by listing the event logs for that specific container in the output.
How do you monitor container resources
cAdvisor
cAdvisor is useful for monitoring resource isolation parameters, historical resource usage, and generating historical data histograms. This data is stored globally for each container for easy analysis of historical performance. The cAdvisor build is provided as an image that can be installed on a Docker host.
The operating-system independent way to check whether Docker is running is to ask Docker, using the docker info command. You can also use operating system utilities, such as sudo systemctl is-active docker or sudo status docker or sudo service docker status , or checking the service status using Windows utilities.In order to list the Docker containers, we can use the “docker ps” or “docker container ls” command. This command provides a variety of ways to list and filter all containers on a particular Docker engine. Let's start by listing all the running containers.
How to list running containers in docker : In order to list the Docker containers, we can use the “docker ps” or “docker container ls” command. This command provides a variety of ways to list and filter all containers on a particular Docker engine. Let's start by listing all the running containers.