drone学习笔记-发布镜像

测试drone部署镜像又遇到N个坑。第一个就是拉取镜像被墙。好吧，这个可以通过国内镜像解决。另一个就是一直在报的错误

Failed to create btrfs snapshot: inappropriate ioctl for device

硬件设置还是synology 716 + II
.drone.yml

# workspace:
#   base: /go
#   path: src/test/demo

pipeline:
  # build:
  #   image: golang:latest
  #   commands:
  #     - go test
  publish:
    image: plugins/docker
    repo: sunsl/demo
    tags : latest
    debug: true
      
# services:
#   database:
#     image: mongo:latest

编译错误

群晖docker信息

从信息中可以看到 Storage Driver为btrfs
在 Use the BTRFS storage driver文中有这样的提示：

Note: The btrfs storage driver is only supported on Docker CE on Ubuntu or Debian, and Docker EE / CS Engine on SLES.

折腾了一天多的时间，看到这里郁闷了，好吧暂时放弃在群晖下测试drone，换服务器测试.....

==,先梳理下思路，看看还有什么没测试到的地方

1. docker运行在btrfs存储上
2. docker启动drone的server和agent容器
3. drone根据配置文件启动一个测试容器（与drone是同一层级的容器）
4. 测试容器内启动一个docker并根据dockerfile生成镜像文件（Docker in Docker）

逐步测试：

1. 在最外层测试创建镜像 (测试通过）

Dockerfile

FROM alpine
RUN echo "Hello docker!"
RUN echo "make dir"
RUN mkdir -p /data/db
RUN echo "expose port"
EXPOSE 8000

编译

 sudo docker build -t sunsl/demo .
Sending build context to Docker daemon 2.048 kB
Step 1 : FROM alpine
 ---> 7328f6f8b418
Step 2 : RUN echo "Hello docker!"
 ---> Running in ce54f9d9a8e6
Hello docker!
 ---> ef0ff48accdc
Removing intermediate container ce54f9d9a8e6
Step 3 : RUN echo "make dir"
 ---> Running in 6fa6e5a214e9
make dir
 ---> eae38249e291
Removing intermediate container 6fa6e5a214e9
Step 4 : RUN mkdir -p /data/db
 ---> Running in 7ff9d7c7f1bd
 ---> cb5244f6649e
Removing intermediate container 7ff9d7c7f1bd
Step 5 : RUN echo "expose port"
 ---> Running in 36e80521a0b2
expose port
 ---> aa9dc796f37a
Removing intermediate container 36e80521a0b2
Step 6 : EXPOSE 8000
 ---> Running in 686876f7af63
 ---> b6081a0bce0d
Removing intermediate container 686876f7af63
Step 7 : RUN echo "completed!!!"
 ---> Running in c227d0885785
completed!!!
 ---> 610405572a84
Removing intermediate container c227d0885785
Successfully built 610405572a84

2. 启动一个library/docker在其内部创建镜像（Docker in Docker） 测试正常！！！

sudo docker run -it --privileged --name some-docker -d docker:17.07.0-ce-dind

admin@sunsl-dev:~$ sudo docker run -it --privileged --name some-docker -d docker:17.07.0-ce-dind
f131d5b26279e7023d6c5a6224c63e1aaa96ff4882aa3975a14031293a51712c

admin@sunsl-dev:~$ sudo docker run -it --rm --link some-docker:docker docker sh
~ # mkdir docker
~ # vi Dockerfile
~ # docker build -t sunsl/demo .
Sending build context to Docker daemon  3.584kB
Step 1/7 : FROM daocloud.io/library/alpine:latest
 ---> 7328f6f8b418
Step 2/7 : RUN echo "Hello docker!"
 ---> Running in 3d04694eef2c
Hello docker!
 ---> 6635ba3812c5
Removing intermediate container 3d04694eef2c
Step 3/7 : RUN echo "make dir"
 ---> Running in 4d09d0b04bcb
make dir
 ---> 30fc023d529e
Removing intermediate container 4d09d0b04bcb
Step 4/7 : RUN mkdir -p /data/db
 ---> Running in 4947b984c06f
 ---> 34a97a2eb15e
Removing intermediate container 4947b984c06f
Step 5/7 : RUN echo "expose port"
 ---> Running in 4f70ac65e998
expose port
 ---> a45dd54382f5
Removing intermediate container 4f70ac65e998
Step 6/7 : EXPOSE 8000
 ---> Running in 172ee2942a7e
 ---> c41f37ed56d8
Removing intermediate container 172ee2942a7e
Step 7/7 : RUN echo "completed!!!"
 ---> Running in a73429ff68c8
completed!!!
 ---> ba0d6edfd0db
Removing intermediate container a73429ff68c8
Successfully built ba0d6edfd0db
Successfully tagged sunsl/demo:latest

3. 测试是否与群晖登录权限有关 （无效）
   手动测试全部正常，考虑是否是与权限有关。因不知道drone是否在启动docker in docker是追加了权限，所以尝试启动群晖的root权限运行drone并设置docker的--privileged参数 。参考：群晖root密码设置

4.想到一个问题，在手动测试docker in docker时的info信息如下：

admin@sunsl-dev:~$ sudo docker run -it --rm --link some-docker:docker docker info
……
Server Version: 17.07.0-ce-rc2 #版本号
Storage Driver: vfs            #这里才是重点
……
Kernel Version: 3.10.102
Operating System: Alpine Linux v3.6 (containerized)
OSType: linux
Architecture: x86_64
CPUs: 4
Total Memory: 7.719GiB
……

详细测试记录：docker run docker 手动测试记录

看到区别了吗？群晖存存格式是btrfs,而docker内用的是vfs格式！！！跪了！！！
然后....TMD继续找资料，如何设置配置文件啊。

storage_driver
supports aufs, overlay or vfs drivers

.drone.yml

……省略其它pipeline部分
publish:
    image: plugins/docker
    registry: 192.168.123.202:55000
    repo: 192.168.123.202:55000/sunsl/demo
    tags : latest
    debug: true
    insecure: true         #私有仓库未设置HTTPS需要启用这个选项
    storage_driver: vfs    #出错原因就是它
……省略其它pipeline部分

两天的成果啊！！！

参考：

• Use the BTRFS storage driver
• Btrfs 和Docker的最佳实践
• docker in docker演示
• drone deloyment doc
• Select a storage driver
• Working with Docker on btrfs as the backend storage filesystem
• Linux 内核中的 Device Mapper 机制
• Drone How to configure Privileged Mode
• drone plugins/docker