The docker exec command

The docker exec command provides the much-needed help to users, who are deploying their own web servers or have other applications running in the background. Now, it is not necessary to log in to run the SSH daemon in the container.

1. First, create a Docker container:

      $ sudo docker run --name trainingapp \  
      training/webapp:latest    
      Unable to find image 
      'training/webapp:latest' locally
      latest: Pulling from training/webapp
      9dd97ef58ce9: Pull complete 
      a4c1b0cb7af7: Pull complete 
      Digest: sha256:06e9c1983bd6d5db5fba376ccd63bfa529e8d02f23d5079b8f74a616308fb11d
      Status: Downloaded newer image for   
      training/webapp:latest

2. Next, run the docker ps -a command to get the container ID:

      $ sudo docker ps -a
      a245253db38b        training/webapp:latest    
      "python app.py"

3. Then, run the docker exec command to log...