What is Docker?

• Docker is an open source application container engine, which is based on Go language and complies with Apache 2.0 0 protocol is open source.
• Docker allows developers to package their applications and dependency packages into a lightweight and portable container, and then publish them to any popular Linux machine. It can also realize virtualization.
• Containers completely use the sandbox mechanism, and there will be no interfaces between them (similar to iPhone app s). More importantly, the performance overhead of containers is very low.
• After version 17.03, Docker is divided into CE (Community Edition) and EE (Enterprise Edition). We can use the Community Edition.

Advantages of Docker

• Docker is an open platform for developing, delivering and running applications. Docker enables you to separate your applications from your infrastructure so that you can deliver software quickly.
• With Docker, you can manage your infrastructure the same way you manage your applications. By using Docker's method to quickly deliver, test and deploy code, you can greatly reduce the delay between writing code and running code in a production environment.

Docker architecture

• Image: Docker image is equivalent to a root file system. For example, the official image ubuntu:16.04 contains a complete set of Ubuntu 16 04 root file system of the smallest system.
• Container: the relationship between an Image and a container is like a class and instance in object-oriented programming. An Image is a static definition, and a container is an entity when the Image runs. Containers can be created, started, stopped, deleted, paused, and so on.
• Repository: a repository can be regarded as a code control center for storing images.

Docker installation steps

Install Docker dependency package

sudo yum install -y yum-utils

 sudo yum-config-manager \
    --add-repo \
    https://download.docker.com/linux/centos/docker-ce.repo

Install Docker

sudo yum install docker-ce docker-ce-cli containerd.io

Start Docker

 sudo systemctl start docker

# View Docker status
sudo systemctl status docker

#View Docker version
docker -v

Set Docker startup

sudo systemctl enable docker

Configuring alicloud image acceleration

sudo mkdir -p /etc/docker
sudo tee /etc/docker/daemon.json <<-'EOF'
{
  "registry-mirrors": ["https://3c8cr4xv.mirror.aliyuncs.com"]
}
EOF
sudo systemctl daemon-reload
sudo systemctl restart docker

Docker installation mysql

#Official image address
https://hub.docker.com/

#Download command
 docker pull mysql:5.7
 

Docker starts Mysql

     sudo docker run -p 3306:3306 --name mysql \
    -v /mydata/mysql/log:/var/log/mysql \
    -v /mydata/mysql/data:/var/lib/mysql \
    -v /mydata/mysql/conf:/etc/mysql \
    -e MYSQL_ROOT_PASSWORD=root \
    -d mysql:5.7
#Detailed explanation of parameters
 The password is root
    Parameters:
    • -p 3306:3306: Map the 3306 port of the container to the 3306 port of the host
    • --name: Name the container mysql,  If you name it mysql11  mysql22 All right
    • -v /mydata/mysql/log:/var/log/mysql: Mount the configuration file to the host/mydata/..  No need to enter docker Medium mysql File.
     hold docker In container Mysql File mount to external linxu In the file.
    • -e MYSQL_ROOT_PASSWORD=root: initialization root The user's password is root.
    -d  It operates in the background mode, mysql:8.0 So  mysql  8.0 Mirror boot container for.
    After each sentence \  Is a newline flag.

Modify the encoding format of mysql

Enter the attached mysql configuration directory

cd /mydata/mysql/conf

After entering, there are no files. We can edit and create them

vi my.cnf

Enter the following

	[client]
    default-character-set=utf8
    [mysql]
    default-character-set=utf8
    [mysqld]
    init_connect='SET collation_connection = utf8_unicode_ci'
    init_connect='SET NAMES utf8'
    character-set-server=utf8
    collation-server=utf8_unicode_ci
    skip-character-set-client-handshake
    skip-name-resolve

Restart mysql

docker restart mysql

View profile content

 docker exec -it mysql /bin/bash
 cd /etc/mysql
 cat my.cnf

Dock install redis

Pull image

docker pull redis

docker starts redis

Create redis profile directory

mkdir -p /mydata/redis/conf

touch /mydata/redis/conf/redis.conf

Start redis container

docker run -p 6379:6379 --name redis \
-v /mydata/redis/data:/data \
-v /mydata/redis/conf/redis.conf:/etc/redis/redis.conf \
-d redis redis-server /etc/redis/redis.conf

Enter redis console test
docker exec -it redis redis-cli

Configure persistence and password for redis

# Enter the configuration file directory
 cd  /mydata/redis/conf
 # Enter configuration file
 vim redis.conf
 #Configuration persistence
 appendonly yes
 #redis password
 requirepass password

Restart docker

docker restart redis

Set docker container self start

# mysql
docker update mysql --restart=always
#redis
docker update redis --restart=always

Docker installation rabbitmq

Pull image

docker pull rabbitmq:management

Create and start a container based on the downloaded image

 sudo  docker run  -p 5671:5671 -p 
 5672:5672 -p 4369:4369 
 -p 25672:25672 -p 15671:15671
 -p 15672:15672  --name rebbitmq  
 -d  rabbitmq:management

Port details
436925672 (Erlang discovery cluster port)
56725671 (AMQP port)
15672: (Web management background port)
61361614(STOMP protocol port)
1883 8883(MQTT protocol port)

Restart rabbitmq

docker restart rebbitmq

Self restart

docker update rebbitmq --restart=always

Open the web management side

# Access address
 http://ip address: 15672
# Default user name and password
 user name:guest
 password:guest 

Delete container

Stop the container before deleting it

# View running containers
docker ps
# Stop a running container
docker stop container id
#Delete container
docker rm container id

delete mirror

Delete the container before deleting the mirror

# View mirror
docker images
#delete mirror
docker rmi image id