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I would like to write a bash script that automates the following:
Get inside running container
docker exec -it CONTAINER_NAME /bin/bash
Execute some commands:
cat /dev/null > /usr/local/tomcat/logs/app.log
exit
The problematic part is when docker exec is executed. The new shell is created, but the other commands are not executed.
Is there a way to solve it?
649
Running Commands in an Alternate Directory in a Docker Container. To run a command in a certain directory of your container, use the --workdir flag to specify the directory: docker exec --workdir /tmp container-name pwd.
Step 1: Create a script.sh file and copy the following contents. Step 2: You should have the script.sh is the same folder where you have the Dockerfile. Create the Dockerfile with the following contents which copy the script to the container and runs it part of the ENTRYPOINT using the arguments from CMD.
Even though you run your docker executable in "git bash" the underlying executable is still a windows version of docker which makes it hiccup. On Powershell this works because Powershell creates the path as it should (windows version) on CMD the shell does not understand this command. and it might actually work.
You can use heredoc with docker exec command:
docker exec -i CONTAINER_NAME bash <<'EOF'
cat /dev/null > /usr/local/tomcat/logs/app.log
exit
EOF
To use variables:
logname='/usr/local/tomcat/logs/app.log'
then use as:
docker exec -i CONTAINER_NAME bash <<EOF
cat /dev/null > "$logname"
exit
EOF
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