A partir de ahora, vamos a trabajar sobre K8s, por lo que vamos a tener que eliminar el contenedor anterior para no tener problemas con los puertos: $ docker rm -f kubapp. Nota: No hemos parado el contenedor simplemente utilizando docker stop, en mi caso, lo he eliminado de forma forzada directamente. Si se desea, se puede simplemente parar. Docker version.: Muestre el comando y la version tanto para el cliente de docker, como para el demonio de docker. Docker help pul.l: muestra ayuda contextual del comando con nombre pull en este caso. Docker images.:Lista la lista de imagenes disponibles en el host de docker. Es importante notar que las imagenes de docker tienen un tag, que es.
Syntax
- docker stats [OPTIONS] [CONTAINER...]
- docker logs [OPTIONS] CONTAINER
- docker top [OPTIONS] CONTAINER [ps OPTIONS]
Entering in a running container
To execute operations in a container, use the docker exec command. Sometimes this is called 'entering the container' as all commands are executed inside the container.
or
And now you have a shell in your running container. For example, list files in a directory and then leave the container:
You can use the -u flag to enter the container with a specific user, e.g. uid=1013, gid=1023.
The uid and gid does not have to exist in the container but the command can result in errors.If you want to launch a container and immediately enter inside in order to check something, you can do
docker run...; docker exec -it $(docker ps -lq) bash
the command docker ps -lq outputs only the id of the last (the l in -lq) container started. (this supposes you have bash as interpreter available in your container, you may have sh or zsh or any other)
Monitoring resource usage
Inspecting system resource usage is an efficient way to find misbehaving applications. This example is an equivalent of the traditional top command for containers:
To follow the stats of specific containers, list them on the command line:
Docker stats displays the following information:
By default docker stats displays the id of the containers, and this is not very helpful, if your prefer to display the names of the container, just do
docker stats $(docker ps --format '{{.Names}}')
Monitoring processes in a container
Inspecting system resource usage is an efficient way to narrow down a problem on a live running application. This example is an equivalent of the traditional ps command for containers.
To filter of format the output, add ps options on the command line:
Or, to get the list of processes running as root, which is a potentially harmful practice:
The docker top command proves especially useful when troubleshooting minimalistic containers without a shell or the ps command.
Attach to a running container
'Attaching to a container' is the act of starting a terminal session within the context that the container (and any programs therein) is running. This is primarily used for debugging purposes, but may also be needed if specific data needs to be passed to programs running within the container.
The attach command is utilized to do this. It has this syntax:
<container> can be either the container id or the container name. For instance:
Or:
You may need to sudo the above commands, depending on your user and how docker is set up.
Note: Attach only allows a single shell session to be attached to a container at a time.
Warning: all keyboard input will be forwarded to the container. Hitting Ctrl-c will kill your container.
To detach from an attached container, successively hit Ctrl-p then Ctrl-q
To attach multiple shell sessions to a container, or simply as an alternative, you can use exec. Using the container id:
Using the container's name:
exec will run a program within a container, in this case /bin/bash (a shell, presumably one the container has). -i indicates an interactive session, while -t allocates a pseudo-TTY.
Note: Unlike attach, hitting Ctrl-c will only terminate the exec'd command when running interactively.
Printing the logs
Following the logs is the less intrusive way to debug a live running application. This example reproduces the behavior of the traditional tail -f some-application.log on container 7786807d8084.
This command basically shows the standard output of the container process (the process with pid 1).
If your logs do not natively include timestamping, you may add the --timestamps flag.
It is possible to look at the logs of a stopped container, either
start the failing container with
docker run ... ; docker logs $(docker ps -lq)find the container id or name with
docker ps -a
and then
docker logs container-id or
docker logs containername
as it is possible to look at the logs of a stopped container
Docker container process debugging
Docker is just a fancy way to run a process, not a virtual machine. Therefore, debugging a process 'in a container' is also possible 'on the host' by simply examining the running container process as a user with the appropriate permissions to inspect those processes on the host (e.g. root). For example, it's possible to list every 'container process' on the host by running a simple ps as root:
Docker On Localhost
Any currently running Docker containers will be listed in the output.
Docker Para Docker Demonio Enlazar A Localhost De
This can be useful during application development for debugging a process running in a container. As a user with appropriate permissions, typical debugging utilities can be used on the container process, such as strace, ltrace, gdb, etc.
Estimated reading time: 3 minutes
Docker Desktop for Mac provides several networking features to make iteasier to use.
Control Plane. Docker Swarm provides native support for key capabilities like multi-host networking and volume management for Dockerized applications. A Compose file built in development can be simply deployed (docker-compose up) to a testing server or Swarm cluster. Docker Swarm can pull and run images from both Docker Trusted Registry or Hub.
Features
VPN Passthrough
Docker Desktop for Mac’s networking can work when attached to a VPN. To do this,Docker Desktop for Mac intercepts traffic from the containers and injects it intoMac as if it originated from the Docker application.
Port Mapping
When you run a container with the -p argument, for example:
Docker Desktop for Mac makes whatever is running on port 80 in the container (inthis case, nginx) available on port 80 of localhost. In this example, thehost and container ports are the same. What if you need to specify a differenthost port? If, for example, you already have something running on port 80 ofyour host machine, you can connect the container to a different port:
Looks like the functionality should be there, but simply hitting the share screen button took me to a dialog box which asked about which app I would like to record.
Now, connections to localhost:8000 are sent to port 80 in the container. Thesyntax for -p is HOST_PORT:CLIENT_PORT.
HTTP/HTTPS Proxy Support
See Proxies.
Known limitations, use cases, and workarounds
Following is a summary of current limitations on the Docker Desktop for Macnetworking stack, along with some ideas for workarounds.
There is no docker0 bridge on macOS
Because of the way networking is implemented in Docker Desktop for Mac, you cannot see adocker0 interface on the host. This interface is actually within the virtualmachine.
I cannot ping my containers
Docker Desktop for Mac can’t route traffic to containers.
Per-container IP addressing is not possible
The docker (Linux) bridge network is not reachable from the macOS host.
Use cases and workarounds
There are two scenarios that the above limitations affect:
I want to connect from a container to a service on the host
The host has a changing IP address (or none if you have no network access). From18.03 onwards our recommendation is to connect to the special DNS namehost.docker.internal, which resolves to the internal IP address used by thehost.This is for development purpose and will not work in a production environment outside of Docker Desktop for Mac.
The gateway is also reachable as gateway.docker.internal.
I want to connect to a container from the Mac
Port forwarding works for localhost; --publish, -p, or -P all work.Ports exposed from Linux are forwarded to the host.
Our current recommendation is to publish a port, or to connect from anothercontainer. This is what you need to do even on Linux if the container is on anoverlay network, not a bridge network, as these are not routed.
The command to run the nginx webserver shown in Getting Startedis an example of this.
To clarify the syntax, the following two commands both expose port 80 on thecontainer to port 8000 on the host:
To expose all ports, use the -P flag. For example, the following commandstarts a container (in detached mode) and the -P exposes all ports on thecontainer to random ports on the host.
See the run command for more details onpublish options used with docker run.
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