Docker into container and swap files

1. Enter the container       

        Sometimes you need to enter the container to operate, use  the docker exec command, you can add many parameters after this command, we only talk about adding -i and -it parameters here.

        When only  the -i parameter is added, since no pseudo-terminal is allocated, the interface does not have the familiar Linux command prompt, but the command execution result can still be returned. Enter the command: docker exec -i tomcat-8081 bash , as shown below:

         When the -it parameter is used together, you can see the familiar Linux command prompt, enter  docker exec -it tomcat-8081 bash , as shown below:

        Command summary:

# 命令表示进入容器  -it 的作用主要是可以看到 linux 的提示符
# 一定要注意，为了节省内存，有些 Linux 命令无法在容器内使用，如 vim，ll等
docker exec -it container_id/name bash

        Enter the container, create a ROOT directory in webapps , then enter the ROOT directory, create an index page, enter  echo 'nefu-yzk.top'>>index.jsp , and then you can access normally, use the exit command to exit the container internally, as follows:

        Refresh the login URL of the browser, and you can see that tomcat can be displayed normally, as shown below:

2. Exchange files between the host and the container

The usage of cp to copy files         between the host and the container is as follows:

# 容器中 复制到 宿主机
docker cp [OPTIONS] CONTAINER:PATH LOCALPATH 
eg：docker cp  tomcat-8081:/usr/local/tomcat/webapps/ROOT/index.jsp /root/

# 宿主机 复制到 容器中
docker cp [OPTIONS] LOCALPATH|- CONTAINER:PATH
eg：docker cp /root/index.jsp tomcat-8081:/usr/local/tomcat/webapps/ROOT/

        It is easier to deploy multiple projects at the same time, as follows:

        You can view the results after deployment. This piece only accesses the service on port 8082 , and you can also access other port services.