Go into the folder that has the Dockerfile and build the image, then the container.
cd craigslist
docker build -t eapen/craigslister:latest .
docker run -d --restart unless-stopped --name craigslister -p IPADDRESS:8880:9001 -t eapen/craiglister
OR
docker run -d --restart unless-stopped -e SLACK_TOKEN={SLACK_TOKEN} --name craigslister -p 0.0.0.0:8880:9001 -t eapen/craiglister
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docker exec -it craigslister /bin/bash
tail -f -n 100 /opt/wwc/logs/craigslister.log