Detailed installation of docker

Keywords: Operation & Maintenance Docker Container

1, Disposition

Linux: CentOS-7-x86_64-DVD-1810.iso

2, Installation

1. If you have previously installed an older version of Docker, you can uninstall it using the following command:

yum remove docker \
                  docker-client \
                  docker-client-latest \
                  docker-common \
                  docker-latest \
                  docker-latest-logrotate \
                  docker-logrotate \
                  docker-selinux \
                  docker-engine-selinux \
                  docker-engine \

2. First of all, we need to connect virtual machines and install yum tools

yum install -y yum-utils \
           device-mapper-persistent-data \
           lvm2 --skip-broken

3. Set yum source

sudo yum-config-manager --add-repo
sed -i 's/\/docker-ce/g' /etc/yum.repos.d/docker-ce.repo
#Update yum cache
yum makecache fast

4. Install docker

yum install -y docker-ce

5. Before starting docker, be sure to close the firewall

# close
systemctl stop firewalld
# Disable boot firewall
systemctl disable firewalld

6. Start docker:

systemctl start docker  # Start docker service

systemctl stop docker  # Stop docker service

systemctl restart docker  # Restart docker service

7. View docker version

docker -v

3, Install image

1, Take nginx as an example

Visit the official website of dockerhub Search nginx

1. Pull the image you need and use the command:

docker pull nginx

2. View the pulled image docker images

docker images

3. Export image to disk

docker save -o nginx.tar nginx:latest

4. Delete the local nginx image first

docker rmi nginx:latest

5. Load local file:

docker load -i nginx.tar

2, Install mysql image

1. Find MySQL image:

docker search mysql

2. Pull MySQL version 5.7 image

docker pull mysql:5.7

3. Check the port first

netstat  -anp  |grep  3306

If occupied, close port 3306

#1. Kill the process
kill -9 PID 

#2. Close the port
sendmail stop mysqld

#3. Stop mysqld service
service mysqld stop

4. Run mysql container

docker search mysqlContainer name required for query
docker psView the docker container running
docker ps -aView all docker containers
docker stop nameStop the currently running docker container
docker start nameStart docker container
docker stop nameStop the currently running docker container
docker restart nameRestart the docker container
docker rm nameDelete docker container
docker exec -it name bashEnter container
exitExit docker container
docker run -d -p 3306:3306 --privileged=true -v /docker/mysql/conf/my.cnf:/etc/my.cnf -v /docker/mysql/data:/var/lib/mysql -e MYSQL_ROOT_PASSWORD=123456 --name mysql mysql:5.7 --character-set-server=utf8mb4 --collation-server=utf8mb4_general_ci
runrun is running a container
-dIndicates background operation
-pRepresents the container internal port and server port mapping Association
–privileged=trueSet the root user permission of MySQL. Otherwise, external users cannot log in using root
-v /docker/mysql/conf/my.cnf:/etc/my.cnfMap the my.cnf configuration in the server to the / docker/mysql/conf/my.cnf configuration in docker
-v /docker/mysql/data:/var/lib/mysqlAs above, map the data directory of the database to avoid data loss when the docker deletes and re runs the MySQL container in the future
-e MYSQL_ROOT_PASSWORD=123456Set the password of the root user of MySQL database
–name mysqlSet the value container name to mysql
mysql:5.7It means starting a container from the docker image mysql:5.7
–character-set-server=utf8mb4 --collation-server=utf8mb4_general_ciDefault code of setting database

4. Create a new MySQL user and enter the container first

docker exec -it mysql bash

5. Execute the MySQL command, enter the root password, and connect to MySQL

mysql -uroot -p

6. After entering the password, create a new user (user name: zhangsan, password: zs123)


4, Installing DockerCompose

1, Introduction:
Docker Compose can help us quickly deploy distributed applications based on Compose files without manually creating and running containers one by one! Instructions define how each container in the cluster operates.

version: "3.8"
    image: mysql:5.7.25
     - "/tmp/mysql/data:/var/lib/mysql"
     - "/tmp/mysql/conf/hmy.cnf:/etc/mysql/conf.d/hmy.cnf"
    build: .
     - "8090:8090"

The above Compose file describes a project, which contains two containers:

  • mysql: a container built based on mysql:5.7.25 image, and two directories are mounted
  • web: a temporarily built image container based on docker build. When mapping ports, it is 8090

2, Installing DockerCompose
1. Modify the file permissions, otherwise it cannot be downloaded

# Modify permissions
chmod +x /usr/local/bin/docker-compose

2. Download

# install
curl -L`uname -s`-`uname -m` > /usr/local/bin/docker-compose

3.Base automatic completion command:

# Completion command
curl -L > /etc/bash_completion.d/docker-compose

If an error occurs here, you need to modify your hosts file:

echo "" >> /etc/hosts

5, Build image warehouse

1, The private server uses the http protocol and is not trusted by Docker by default, so it needs to be configured:

# Open the file you want to modify
vi /etc/docker/daemon.json
# Add content:
"insecure-registries":["192.168.Local machine ip.32:8080"]

vi /etc/docker/daemon.json

  "registry-mirrors": [
 "insecure-registries":["192.168.Local machine ip.32:8080"]

# Reload
systemctl daemon-reload
# Restart docker
systemctl restart docker

2, Use DockerCompose to deploy DockerRegistry with image interface. The command is as follows:

1. Create a directory

mkdir -p /tmp/register-ui

2. Create a docker-compose.yml file

#Enter the / TMP / register UI directory
cd /tmp/register-ui

#Create docker-compose.yml file
touch docker-compose.yml

2. Open the touch docker-compose.yml file and add the following configuration

version: '3.0'
    image: registry
      - ./registry-data:/var/lib/registry
    image: joxit/docker-registry-ui:static
      - 8080:80
      - REGISTRY_TITLE=Mine Warehouse
      - REGISTRY_URL=http://registry:5000
      - registry

3. Enter the docker-compose.yml directory and start the warehouse

docker-compose up -d

4. View log

docker-compose logs -f

3, Push and pull images
① Re tag the local image. The name prefix is the address of the private warehouse:

docker tag nginx:latest 

② Push image

docker push 

③ Pull image

docker pull 

Access warehouse: 192.168. Local ip:8080/

Posted by richei on Sat, 06 Nov 2021 07:43:02 -0700