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network\n\ngithub repo: https://github.com/beenotung/demo-docker-express-cluster\n\ndocker hub repo: https://hub.docker.com/repository/docker/aabbcc1241/demo-express\n\n## Run with docker-compose directly\n\n```bash\ndocker-compose up\n```\n\nWait for some time, you should see below message:\n```\nlistening to Port: 8080\n```\n\nThen you can open the browser at http://localhost:8080/\n\nYou should see a json message displayed on the browser as below:\n```json\n{\n  \"message\": \"hello, world\",\n  \"portInContainer\": \"9090\",\n  \"hasSeenWorker\": true\n}\n```\n\n## Build docker image for customizable container deployment\n\n### build docker image\n```bash\ndocker image build --tag demo-app:1.0 main\n```\n\n### export docker image into file\n```bash\ndocker image save demo-app:1.0 \u003e image.tar\n```\n\n### compress image file\n```bash\nxz -k -T0 image.tar\n```\n\n(transfer to other machine if needed)\n\n### uncompress image file\n```bash\nunxz -k image.tar.xz\n```\n\n### import 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