Question

我正在jenkins的官方码头集装箱上运行jenkins。我按照https://docs.docker.com/engine/installation/linux/debian/

上的说明进行了以下dockerfile

FROM jenkins:2.32.1

# install docker inside this container
USER root
    # Install Docker inside Jenkins
    RUN apt-get update
    RUN apt-get purge "docker.io*"
    RUN apt-get update
    RUN apt-get install -y apt-transport-https ca-certificates gnupg2
    RUN apt-key adv \
       --keyserver hkp://ha.pool.sks-keyservers.net:80 \
       --recv-keys 58118E89F3A912897C070ADBF76221572C52609D
    RUN echo "deb https://apt.dockerproject.org/repo debian-jessie main" > /etc/apt/sources.list.d/docker.list
    RUN apt-get update
    RUN apt-cache policy docker-engine
    RUN apt-get update
    RUN apt-get install -y docker-engine
    RUN gpasswd -a jenkins docker
    USER jenkins

然后我执行以下操作：

从此dockerfile构建图像
从图片中运行容器
以 root用户
在容器内的bash中运行sudo docker service start

这是我得到的：

root@1e0f4b325d58:/# sudo service docker start
mount: permission denied
rmdir: failed to remove ‘cpu’: Read-only file system
mount: permission denied
rmdir: failed to remove ‘cpuacct’: Read-only file system
mount: permission denied
rmdir: failed to remove ‘net_cls’: Read-only file system
mount: permission denied
rmdir: failed to remove ‘net_prio’: Read-only file system
/etc/init.d/docker: 96: ulimit: error setting limit (Operation not permitted)

Answer 1

如果要在docker中运行docker，则需要将容器作为特权容器运行。

因此需要something like this（1）：

docker run --privileged your_image:tag

你还需要小心使用iptables和App Armor，但这需要经过一些修补。

另一种方法是访问容器内的docker守护程序，like so（2）：

docker run -v /var/run/docker.sock:/var/run/docker.sock your_image:tag

价：

1 https://blog.docker.com/2013/09/docker-can-now-run-within-docker/

2 https://jpetazzo.github.io/2015/09/03/do-not-use-docker-in-docker-for-ci/

如何在docker容器中安装/启动docker引擎服务

1 个答案: