Problem Scenario
Sometimes the “docker save” command does not work as you would expect.  You run the command on a Docker host, but it does not work.  You might even try the -o flag or the –output=/tmp/destinationFileName.tar option.  But the response may be an surprising error “Cowardly refusing to save to a terminal. Use the -o flag or redirect.”  You want to copy a Docker image from one machine to another computer but problems get in your way. 

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Continue reading “Saving a Docker Image and Using It On A Different Server”

Goal: You want two Docker containers to use the same file share on the Docker server from time to time.  

Problem/Error blocking goal:  In a Docker container, when you try to change directories to a directory that is on the Docker host (e.g., the docker container was created with the –volume flag), and you get an error “bash: cd <directoryname> permission denied,” you have to run two commands to fix it. 

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Continue reading “Having Two Docker Containers Share A Directory on the Host”

Normally you can enter a Docker container with this command:
docker exec -it <containerIDbash
It is possible you receive an error that says ‘exec “bash”: executable file not found in $PATH’
The root cause could be related to insufficient disk space on the Docker host.  Delete files or otherwise make room (e.g., add disk space).  Then stop the container with this command: docker stop <containerID
Finally,

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