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Here is a silly example of running multiple commands via the CMD instruction in shell-form. I would prefer to use the exec-form, but I don't know how to concatenate the instructions.
shell-form:
CMD mkdir -p ~/my/new/directory/ \ && cd ~/my/new/directory \ && touch new.file exec-form:
CMD ["mkdir","-p","~/my/new/directory/"] # What goes here? Can someone provide the equivalent syntax in exec-form?
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In order to execute multiple commands using the “docker exec” command, execute “docker exec” with the “bash” process and use the “-c” option to read the command as a string. Note: Simple quotes may not work in your host terminal, you will have to use double quotes to execute multiple commands.
Docker will always run a single command, not more. So at the end of your Dockerfile, you can specify one command to run. Not more.
The short answer is, you cannot chain together commands in the exec form.
&& is a function of the shell, which is used to chain commands together. In fact, when you use this syntax in a Dockerfile, you are actually leveraging the shell functionality.
If you want to have multiple commands with the exec form, then you have do use the exec form to invoke the shell as follows...
CMD ["sh","-c","mkdir -p ~/my/new/directory/ && cd ~/my/new/directory && touch new.file"] If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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