Docker
What is docker
The difference between docker and a virtual machine is that a virtual machine uses virtualization technology to deploy a different operating system on the Host OS using a hypervisor, and then runs an app; this often takes up a lot of hardware resources; however, docker uses the concept of containers , directly combine each app and lib to form a container for use.
We can see that the virtual itself occupies a total of 7G of memory, so we have no way to divide more virtual machines to deploy more applications , but we deploy applications, and we use applications instead of operating systems .
Related Concepts
- Images
Images are similar to tarballs, but are "extracts" of discs. To put it simply, before installing the system, you need to use a CD, but after using the virtual CD-ROM, you can directly use the image file to install. The image file cannot be used directly, it needs to be decompressed with tools such as a virtual CD-ROM drive
ref:
Computer knowledge: one step to understand the image file
Base use
- Add permissions for non-root users
Add the existing user apache to the append group group, docker;usermod -a -G apache docker
pre-installations
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apt-get update -
apt-get install vim -
install python
# apt install python-pip #python 2 # apt install python3-pip #python 3sudo ln -s /usr/bin/pip3 /usr/bin/pip -
celery:
pip install celery==5.2.3 -
cv2
apt-get update && apt-get install libgl1
apt-get install libglib2.0-dev
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install python
docker pull python:3.8
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docker common commands
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docker ps -a -
docker cp 本地文件路径 ID全称:容器路径: file transport. -
docker run -it --gpus all nvidia/cuda:10.2-base-ubuntu16.04: start a mirror;docker run -i -t --network host --gpus all mot-service:0811 /bin/bash
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docker commit [OPTIONS] CONTAINER [REPOSITORY[:TAG]]runoob@runoob:~$ docker commit -a "runoob.com" -m "my apache" a404c6c174a2 mymysql:v1 sha256:37af1236adef1544e8886be23010b66577647a40bc02c0885a6600b33ee28057 runoob@runoob:~$ docker images mymysql:v1 REPOSITORY TAG IMAGE ID CREATED SIZE mymysql v1 37af1236adef 15 seconds ago 329 MB-a : The author of the submitted image;
-c : Use the Dockerfile command to create the image;
-m : The explanatory text when submitting;
-p : Pause the container when committing. -
Mount directory
docker run -it --network host -v /home/zzzj/Projects/MOT-service-celery:/home/Projects mot-service:v2 /bin/bash
Caution: When mounting a directory, the local path needs to be specified. -
Delete container
docker container prune: delete the stopped container; -
delete mirror
docker rmi name -
import image
docker load --input face_rec.tar -
export image
docker save > nginx.tar nginx:latest -
docker run/docker exec
"docker run" is usually the command used in newly created containers. It's for when you want to create a container when no other containers are running, and you want to start it, and then run a process on it.
"docker exec" is for when running a command in an existing container. The "docker exec" command is perfect if you already have a running container and want to change it or get something out of it.
Using docker run to create a new container, then using docker exec to enter the container, and then exiting the container does not cause the container to shut down.#run docker background docker run -itd --name ubuntu-test ubuntu /bin/bash #into a docker docker exec -it 243c32535da7 /bin/bash
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Errors:
ncclSystemError: System call (e.g. socket, malloc) or external library call failed or device error. It can be also caused by unexpected exit of a remote peer, you can check NCCL
When docker run, callipccommunication.
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