environmental information

What is Docker?

Docker is a platform with the functions of developing, publishing and running applications. In the project life cycle, we can use docker to realize rapid delivery, testing and deployment. Docker can run on any platform where docker is installed by packaging the running environment into an image (build once and run everywhere).

Install Docker

1. centos version 7 or above is recommended. Installing docker in centos 6 is troublesome. If docker has been installed before, you need to clean it first:

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

2. Toolkit required to install docker

   sudo yum install -y yum-utils
   

   If the following figure is prompted:
   
   This is because the current system does not have CentOS base Repo file, download one again with the command:

   curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
   

3. Add yum source

   sudo yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo 
   

4. Install docker

   // You need to enter y to confirm halfway
   sudo yum install docker-ce docker-ce-cli containerd.io
   

5. Configure image acceleration address (alicloud)
   5.1 first log in to Alibaba cloud console and select container image service
   
   5.2 copy command and execute
   

6. Configure docker auto start

   systemctl enable docker
   

Install mysql

We can let docker create and execute the mysql container, but the mysql data cannot only exist in the container. We need to open up an external path to store mysql data.

1. Install mysql

   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
    For a brief explanation,
    -p 3306:3306: Map the 3306 port of the container to the 3306 port of the host
    -v source address(Host computer):Destination address(container)，The of the host/mydata/mysql/log Mount to mysql Container/var/log/mysql catalogue
    -e Specifies the environment variables within the container,Here is the designated mysql Password is root
    -d Run the container in the background and return to the container ID
    mysql:5.7 appoint mysql Version. The specific version can be found in https://hub.docker.com query
    
   

2. Verify that mysql is installed successfully

   docker ps
   

   As follows, if mysql is displayed, the installation is successful
   

3. Enable mysql remote access:

   Enter first mysql container
   docker exec -it mysql /bin/bash
    Sign in mysql，The password is set when we initialize root
   mysql -uroot -p
    Then start turning on remote access
   use mysql;
   select host,user from user;
   

   
   Check that the host is not% and need to be updated to% (if it is% skip, directly carry out the following authorization):

   update user set host = '%' where user = 'root';
   

   Then start authorization

   // This sentence will enable the remote access permission of root. In fact, an account with small permission should be opened according to the scenario
   GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY 'root' WITH GRANT OPTION;
   // Refresh permissions
   flush privileges;
   

4. The remote access permission for mysql itself is enabled above. The firewall needs to be configured below. Alibaba cloud also needs to configure the security group on the console to open port 3306.

   # If firewalld is not turned on, turn it on first
   service firewalld start
   #Open 3306 ports
   firewall-cmd --permanent --add-port=3306/tcp;
   #Restart the firewall (restart the firewall after modifying the configuration)
   firewall-cmd --reload
   

   Finally, configure mysql auto start:

   docker update --restart=always mysql
   

   At this point, you can use navicat to access MySQL

Install redis

1. First, create the redis data storage directory and configuration file

   mkdir -p /mydata/redis/conf
   touch /mydata/redis/conf/redis.conf
   // Edit the configuration file to enable persistence
   vi /mydata/redis/conf/redis.conf
   // Add the following command to the configuration file
   appendonly yes
   

2. Install redis

   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 --requirepass "123456"
   
    For a brief explanation,
    -p 6379:6379: Map the 6379 port of the container to the 6379 port of the host
    -v /mydata/redis/data:/data，The of the host/mydata/redis/data Mount to redis Container/data catalogue
    -v /mydata/redis/conf/redis.conf:/etc/redis/redis.conf，The of the host redis.conf File replacement container redis.conf File, so that we can check it on the host redis Configure
   redis-server /etc/redis/redis.conf，adopt redis.conf function redis
   --requirepass "123456",Set password to 123456
   

   Add firewall rules to enable redis remote access (Alibaba cloud also needs to configure security groups to open 6379 ports):

   #Open 6379 port
   firewall-cmd --permanent --add-port=6379/tcp;
   #Restart the firewall (restart the firewall after modifying the configuration)
   firewall-cmd --reload
   

   Configure redis auto start:

   docker update --restart=always redis