Using docker to develop NAS applications
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This document introduces using Docker to develop NAS applications. It begins with an overview of Docker and containers, then demonstrates how to build Docker images, run containers, and deploy NAS applications as Docker containers using Container Station. It also addresses some common questions about Docker including how to skip Container Station initialization, debug closed containers, backup container data, access NAS information from containers, and resources for learning Docker.
![Package_routines
pkg_post_install() {
…..
DEPEND_ON=container-station
/sbin/setcfg $QPKG_NAME depend_on "${DEPEND_ON}" -f /etc/config/qpkg.conf
/sbin/log_tool -t0 -uSystem -p127.0.0.1 -mlocalhost -a "[$QPKG_NAME] Start installation"
$CONTAINER_STATION/bin/qbus post com.qnap.dqpkg/qpkg '{"qpkg": "'$QPKG_NAME'",
"action": "install"}'
}](https://image.slidesharecdn.com/usingdockertodevelopnasapplications-160715142802/85/Using-docker-to-develop-NAS-applications-37-320.jpg)
Using docker to develop NAS applications
- 1. Using Docker to develop NAS application Terry Chen
- 2. About me ● Backend engineer : Java, Python, Linux ● QNAP Container Station/Linux Station https://www.linkedin.com/in/seterrychen https://github.com/seterrychen https://twitter.com/seterrychen
- 3. Outline ● Introduce basic knowledge of Docker ● Using Docker to deploy NAS applications
- 4. What is container? From : Macmillan Dictionary
- 5. What is container? From : Macmillan Dictionary From : http://www.containerhireaust.com.au/containers/20-foot-general-purpose/
- 7. With container From : http://pointful.github.io/docker-intro/#/6
- 8. Other key property of container Isolation
- 9. Deploy software From : https://goo.gl/YIKVMJ http://www.hive-io.com/virtual-server-infrastructure/ Development Environment Production Environment
- 10. Application stack OS Kernel System libraries Language runtime Application code Configuration
- 11. Container concept in software engineering From : http://www.vccoaching.com/smarter-thinking/ http://pclosmag.com/html/Issues/201304/page08.html OS Kernel System libraries Language runtime Application code Configuration
- 12. Virtual machine OS Kernel System libraries Language runtime Application code Configuration
- 13. Linux Container (LXC) OS Kernel System libraries Language runtime Application code Configuration System libraries Language runtime Application code Configuration System libraries Language runtime Application code Configuration System libraries Language runtime Application code Configuration
- 14. VM vs container
- 15. Basic isolation of Linux ● chroot : A chroot on Unix operating systems is an operation that changes the apparent root directory for the current running process and its children. From : http://freedompenguin.com/articles/how-to/learning-the-linux-file-system/
- 16. DEMO
- 17. Isolation of LXC ● Linux Kernel feature : ○ Namespaces ■ Mount namespaces ■ UTS namespaces ■ IPC namespaces ■ PID namespaces ■ Network namespaces ■ User namespaces
- 18. Tools of LXC ● lxc-create : download base rootfs and create a container ● lxc-start, lxc-stop … : control the container ● lxc-attach : start a process inside a running container ● lxc-ls : list all containers status
- 19. DEMO
- 20. Pain point when using LXC (in my case) ● Install your application by script ● Deploy containers by manual ● No version control system/repositories to store containers you already install application From : http://icons.iconarchive.com/icons/babasse/imod/72/Tar-icon.png Host 1 Host 2 container-v1.0 container-v2.0 container-v3.0 container-v1.0 container-v1.1
- 21. 教練，我只想運作我的程式！！
- 22. What is Docker ? Docker is an open-source engine which automates the deployment of applications as highly portable, self-sufficient containers. (From : https://github.com/docker/docker/wiki/Docker-0.3.0-release-note,-May-6-2013)
- 23. Docker and Linux From : https://en.wikipedia.org/wiki/Docker_(software)
- 24. Docker power From : https://yq.aliyun.com/articles/32071 Dockerfile
- 25. Dockerfile FROM alpine:3.3 RUN apk add --no-cache nginx
- 26. Docker build my-nginx:0.1 image FROM alpine:3.3 RUN apk add --no-cache nginx
- 27. Docker build my-nginx:0.1 image FROM alpine:3.3 RUN apk add --no-cache nginx From : http://thepapist.org/ask-a-question/
- 28. Layers of My-nginx image (Docker version 1.9) 0dcd4549ae28 4.797 MB ff2b369bf5c3 1.454 MB Image : my-nginx:0.1 FROM alpine:3.3 RUN apk add --no-cache nginx
- 29. Docker image / container 0dcd4549ae28 4.797 MB ff2b369bf5c3 1.454 MB Image : my-nginx:0.1 Container mount
- 30. AUFS – Another Union File System From : https://docs.docker.com/engine/userguide/storagedriver/aufs-driver/
- 31. DEMO
- 32. Process inside container my-nginx container nginx: master process nginx: worker process PID 1 host nginx: master process nginx: worker process PID 5566
- 33. Stop container my-nginx container nginx: master process nginx: worker process Send SIGTERM
- 34. Install dockerized application by qpkg ● For example : Redmine ( docker-qdk2 ) ├── icons ├── package_routines ├── qpkg.cfg ├── shared │ ├── docker-compose.yml │ ├── redmine.conf │ └── redmine.sh └── x86_64
- 35. docker-compose postgresql: image: sameersbn/postgresql:9.4-11 environment: - DB_USER=redmine - DB_PASS=password - DB_NAME=redmine_production redmine: image: sameersbn/redmine:3.2.0-1 links: - postgresql:postgresql environment: - REDMINE_PORT=10083 - REDMINE_RELATIVE_URL_ROOT=/redmine ports: - "127.0.0.1:10083:80"
- 36. Redmine.conf ProxyRequests off ProxyPass /redmine/ http://127.0.0.1:10083/redmine/ ProxyPassReverse /redmine/ http://127.0.0.1:10083/redmine/
- 37. Package_routines pkg_post_install() { ….. DEPEND_ON=container-station /sbin/setcfg $QPKG_NAME depend_on "${DEPEND_ON}" -f /etc/config/qpkg.conf /sbin/log_tool -t0 -uSystem -p127.0.0.1 -mlocalhost -a "[$QPKG_NAME] Start installation" $CONTAINER_STATION/bin/qbus post com.qnap.dqpkg/qpkg '{"qpkg": "'$QPKG_NAME'", "action": "install"}' }
- 38. Container Station API ● Version V1.6.1600
- 39. DEMO
- 40. Common questions Q: Can skip the initialization of Container Station ? A: Using system-docker
- 41. Common questions Q: Why is a container suddenly closed after executing docker run ? A: The PID 1 process inside container is closed. Please using bash replace the default command to debug.
- 42. Common questions Q: How to backup data of a container A: Using docker run -v /host_path/backup:/container_path/data
- 43. Common questions Q: At container, how to get information of NAS A: Using docker -v /host/your_socket:/container/run. Example : -v /etc/qbus:/etc/qbus -v /var/run/qbus.sock:/var/run/qbus.sock -v /share/CACHEDEV2_DATA/.qpkg/container-station/usr/bin/.libs/qbus:/bin/qbus
- 44. Common questions Q: How to learn Docker ? A: Docker Docs is your friend!