First Docker notes (iii) Getting started with Docker

Third, Getting Started with Docker (the following operating environment is on the Cetos6.364bit system)

1. Create a container

#docker run-i-T Ubuntu/bin/bash

The-I flag guarantees that the STDIN in the container is open, although we are not attached to the container,the-t Flag tells Docker to assign a pseudo-TTY terminal to the container to be created .

Appendix: The following issues are encountered when executing this instruction:

FATA[0000] Gethttp:///var/run/docker.sock/v1.17/images/search?term=ubuntu:dial Unix/var/run/docker.sock:no such File or directory. is trying to connect to atls-enabled daemon without TLS?

cause:Docker service does not start: Servicedocker start set boot:chkconfigdocker on

FATA[0000] Cannot connect tothe Docker daemon. Is ' docker-d ' running on this host?

Cause:The docker-d process did not start

try to solve: docker-d &

Error :

====================================================================

INFO[0000] +jobserveapi (unix:///var/run/docker.sock)

INFO[0000] warning:you arerunning Linux kernel version 2.6.32-431.11.7.el6.ucloud.x86_64, which might beunstable running Docker. Upgrade your kernel to 3.8.0.

Docker:relocation error:docker:symbol Dm_task_get_info_with_deferred_remove, version Base not Definedin file libdevmapper.so.1.02 with link Time reference

[1]+ Exit 127 docker-d

====================================================================

workaround : Install the necessary plugins Yumupgrade device-mapper-libs

Execute command :d ocker-d&

Continue # dockerrun-i-T Ubuntu/bin/bash it means creating a container based on an Ubuntu image and using an interactive shell environment. the Docker run command first scans the local host mirror and, if not found, establishes a connection to the Docker repository and downloads the corresponding image.

2. Common commands:

View Image

# Docker Search Ubuntu # searching for images

# Docker pull Ubuntu # Download Image

# Docker Images # View local Mirror Resources

# docker Images-a : List all images(including history)

# Docker Images--tree : Show all layers of mirroring (layer)

# Docker RMI <image id>: Delete one or more image

View Container

# docker PS : List all currently running container

# docker Ps-l : List The most recently launched container

# docker Ps-a : List all container(including history, running container)

# docker Ps-q : List The last run of Containerid

actions for the container:

# docker start/stop/restart<container> : Open / stop / restart container

# docker start[container_id] : Run a container again (including historical container)

# docker attach[container_id] : Connect a running container instance (that is, the instance must be the start state, multiple windows can attach a container instance) is actually going into the container

# docker start-i<container> : Start a container and enter interactive mode (equivalent to start first, in attach)

# docker Run-i-t<image>/bin/bash : Use image to create container and enter interactive mode , login Shell is /bin/bash

# docker Run-i-t-p: Map The host port to the container to facilitate external access to the container service,Host_port can be omitted, Omitting means mapping container_port to a dynamic port.

Note: Using start is a startup that has been created container, using Run to open a new container with the image .

Delete Container

# docker RM <container...> : Delete one or more container

# docker RM ' Docker ps-a-Q ': Remove all container

# docker Ps-a-Q | Xargsdocker rm : Ibid ., Delete all container

3. The container is created with a custom command operation:

# Docker run--name custom name -i-t <images>/bin/bash

where the custom name contains the following characters: lowercase letters A-Z,uppercase letters A-Z, numeric 0-9, underscores, dots, dashes. The name of the container must be unique

4. re-enter the restart

# Dockerattach container name

if the shell of the container is introduced , the container will also stop running

5. Create a daemon container

# Docker Run--name <name>-dubuntu/bin/sh-c "while True;do echo Hello world;sleep 1;done"

Create a daemon container (using the-D parameter to make the container run in the background) execute a command (-c)

Instance operation: (Reference : http://segmentfault.com/a/1190000000755980)

Experiment with the official nginx Image:

# Docker Pull Nginx

generate a test page that is stored in a directory ( e.g. /opt/nginx/)

# echo "

Create a container based on the nginx image, and use -V to assign the default file in the container to the custom site directory on the host, port mapping: 8000 à container of 80 of the host machine Port -D parameter causes the container to run in the background

# Docker Run--name nginx1.9.0-v/opt/nginx/:/usr/share/nginx/html:ro-p 8000:80-d nginx:1.9.0

Copy files from the Docker container to the host ( but not vice versa )

# docker CP nginx1.9.0:/etc/nginx/nginx.conf/opt/nginx/

6. View the logs, processes inside the container

# Docker Logs nginx1.9.0

# docker logs-f nginx1.9.0 à equivalent to Tail-f

# Docker logs--tail nginx1.9.0 view last line

# Docker logs--tail 0 nginx1.9.0 View the latest log information

# Docker Top nginx1.9.0

7. run the specified process in the container

# docker exec-d nginx1.9.0 touch/opt/nginx/test.txt Create an empty file inside the container

# docker EXEC-T-I nginx1.9.0/bin/bash start an interactive shell task in a container

8. Stop the daemon container

# Docker Stop nginx1.9.0 ( or container ID)

9. set up the container to run automatically to prevent certain errors from causing the container to stop affecting the business

# Docker Run--restart=always--namenginx1.9.0-d nginx:1.9.0/bin/bash-c XX

the--RESTART flag can be set to

Always: Docker automatically restarts the container regardless of the container's exit code

On-failure: automatically restarts only if the container's exit code is not 0

# Docker Run--restart=on-failure:5--name nginx1.9.0-d nginx:1.9.0/bin/bash-c XX

Docker automatically restarts 5 times when the container exit code is not 0

Learn more about containers

# Docker Inspect nginx1.9.0

You can view some details about the container, including open ports, installation paths, configuration files, system configuration, etc.

# Docker Inspect--format ' {{. State.running}} ' nginx1.9.0

True

to view the running status of a container

# Docker Inspect--format ' {{. Networksettings.ipaddress}} ' nginx1.9.0

View the container's IP Address

# Docker Inspect-f ' {. Name}} {{. State.running}} ' nginx1.9.0 ubuntu14.04

/nginx1.9.0 true

/ubuntu14.04 true

View the names and operations of multiple containers

One by one. Delete all containers

# docker RM ' Docker ps-a-Q '

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First Docker notes (iii) Getting started with Docker