How to set an environment variable in a running docker container

Question

If I have a docker container that I started a while back, what is the best way to set an environment variable in that running container? I set an environment variable initia

Answer 1

There are generaly two options, because docker doesn't support this feature now:

1. Create your own script, which will act like runner for your command. For example:

   #!/bin/bash
   export VAR1=VAL1
   export VAR2=VAL2
   your_cmd
   

2. Run your command following way:

   docker exec -i CONTAINER_ID /bin/bash -c "export VAR1=VAL1 && export VAR2=VAL2 && your_cmd"