Shulou(Shulou.com)06/03 Report--

Today, what the editor shares with you is the introduction and use of common commands in Docker containers. The article lists in detail the common commands in Docker and uses examples to show how to use them. Interested friends can use them for reference. I hope it will be helpful to you.

Docker common commands: mirror, container, network, data volume

Dockerfile example:

Dockerfile is a mirror description file that contains instructions, each of which builds a layer, so the content of each instruction is to describe how the layer should be built. Basic structure of Dockerfile:

-basic image

-maintainer information

-Image build instruction

-execute instructions when the container starts

FROM node:8

LABEL maintainer= "Jext Community, https://github.com/rickding/HelloDocker"

# copy files

COPY. / usr/node/

WORKDIR / usr/node/

# launch service

CMD ["node", "hello.js"]

EXPOSE 8010

Common Dockerfile directives:

Common commands for Docker-compose resource orchestration:

Docker-compose.yml example:

The resource orchestration file defines version information, services service configuration, networks network information, volumes volume information, and contains the container configuration for each service startup.

Version:'3'

Services:

Db:

Hostname: db

Image: mysql:5

Command:-- default-authentication-plugin=mysql_native_password

Ports:

-3306 3306

Environment:

MYSQL_DATABASE: starter

MYSQL_ROOT_PASSWORD: root

Api:

Image: starter_api:latest

Build:.

Ports:

-8011 Phantom 8011

Depends_on:

-db

Common docker-compose.yml directives:

Common commands for Swarm cluster deployment:

Skills for viewing logs logs

Log is very important in the operation of the system, development, testing and operation and maintenance find the cause of the fault through system log analysis. The logs command formats the log information in combination with grep:

Docker-compose logs-ft | grep-- color-I-e error-e warn-e version-e exception

The Docker three Musketeers logs command is sorted out as follows:

Docker prune cleans up system garbage

Based on the Linux kernel, Docker allocates and isolates resources through operating system and virtual container calls to CGroup, Namespace and other system interfaces. The basic architecture is as follows:

Docker relies on system resources to run, and some garbage will be generated in the process of allocation and recycling, for example, docker rm deletion is not performed after docker stop container. Run docker system df to view the resource information. RECLAIMABLE is the recyclable ratio:

Add the option-v to display details: docker system df-v

Tips: run the prune command to clean up the garbage and release resources:

Docker system prune-volumes

The prune commands provided by Docker are organized as follows:

Instance 1:Docker starts nginx

L code: https://github.com/rickding/HelloDocker/tree/master/nginx

Configuration and script files:

├── docker-compose.yml

├── build.sh

├── run.sh

├── stop.sh

L Dockerfile adds web pages and configuration files based on nginx images:

FROM nginx:stable

# web files

COPY. / web/ / usr/share/nginx/html

# config

COPY. / conf/nginx.conf / etc/nginx/nginx.conf

COPY. / conf/conf.d / etc/nginx/conf.d

WORKDIR / etc/nginx

EXPOSE 80

L build image: execute script. / build.sh or command: docker build-t nginx:latest.

L launch container instance: execute script. / run.sh or command: docker run-it-- name nginx-p 80:80-d nginx:latest

L visit http://localhost:80/ and see the page:

Stop deleting instances: execute script. / stop.sh or command: docker stop nginx & & docker rm nginx

Example 2: resource orchestration Web service

L code: https://github.com/jextop/StarterDeploy

Configuration and script files:

├── docker-compose.yml

├── pull.sh

├── up.sh

├── logs.sh

├── down.sh

L docker-compose.yml deploys multiple container instances on which Web service depends, including database, cache, message queue, log system, API interface and Web management backend:

Version:'3'

Services:

Db:

Hostname: db

Image: mysql:5

Command:-- default-authentication-plugin=mysql_native_password

Ports:

-3306 3306

Environment:

MYSQL_DATABASE: starter

MYSQL_ROOT_PASSWORD: root

Cache:

Hostname: cache

Image: redis:4

Command: redis-server-- appendonly yes

Ports:

-6379PUR 6379

Mq:

Hostname: mq

Image: webcenter/activemq:latest

Ports:

-61616purl

-8161 Phantom 8161

Elasticsearch:

Hostname: elasticsearch

Image: elasticsearch:latest

Ports:

-9200 purl 9200

-9300 purl 9300

Log:

Hostname: log

Image: registry.cn-shanghai.aliyuncs.com/hellodock/logstash:7.5.2

Ports:

-9600 purl 9600

-9601 Freund 9601

Depends_on:

-elasticsearch

Db_admin:

Image: adminer:latest

Ports:

-3006 purl 8080

Depends_on:

-db

Api:

Image: registry.cn-shanghai.aliyuncs.com/jext/starter_api:latest

Ports:

-8011 Phantom 8011

Depends_on:

-db

-cache

-mq

-log

Admin:

Image: registry.cn-shanghai.aliyuncs.com/jext/starter_admin:latest

Ports:

-8010 purl 8010

Depends_on:

-api

L start the Web service: execute the script. / up.sh or command: docker-compose up-d

L View the running instance: docker-compose ps

L View log: execute script. / logs.sh or command: docker-compose logs-ft

L visit http://127.0.0.1:8010/ and see the page:

L stop and delete services: execute script. / down.sh or command, docker-compose down-- remove-orphans

Example 3: cluster deployment of Web services

L code: https://github.com/jextop/StarterDeploy

Configuration and script files:

├── docker-compose.yml

├── pull.sh

├── deploy.sh

├── rm.sh

L docker-compose.yml adds deploy attribute, replicas specifies the number of copies, and placement specifies docker node:

Deploy:

Replicas: 1

# placement:

# constraints: [node.labels.group = = api]

L start Swarm to join the node to build a cluster, and the first node automatically becomes the administrator: docker swarm init

Deploy Web service: execute script. / deploy.sh or command: docker stack deploy-c docker-compose.yml starter

L View Stack and services: docker stack ls & & docker service ls

L stop deletion service: execute script. / rm.sh or command: docker stack rm starter

The above is the introduction and use of the common commands of the Docker container, and you need to use it yourself to understand the details. If you want to know more about it, welcome to follow the industry information channel!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.