碰到的问题
我的主机操作系统安装的是Ubuntu 14.04.1 LTS，内核版本为：3.8.0-21-generic
在运行docker命令或者dockerd时，总是直接core掉。
重新安装docker
删除旧版本的docker
sudo apt-get purge -y docker-engine docker docker.io docker-ce
sudo apt-get autoremove -y --purge docker-engine docker docker.io docker-ce
修改apt source：（/etc/apt/sources.list）
deb http://mirrors.aliyun.com/ubuntu/ trusty main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ trusty-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ trusty-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ trusty-proposed main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ trusty-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ trusty main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ trusty-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ trusty-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ trusty-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ trusty-backports main restricted universe multiverse
重新安装docker
sudo apt-get update
apt-get install docker
运行dockerd，会发现报以下错误：
You are running linux kernel version 3.8.0-21-generic, which might be unstable running docker. Please upgrade your kernel to 3.10.0.
升级内核
wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.10.10-saucy/linux-headers-3.10.10-031010-generic_3.10.10-031010.201308291422_amd64.deb
wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.10.10-saucy/linux-headers-3.10.10-031010_3.10.10-031010.201308291422_all.deb
wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.10.10-saucy/linux-image-3.10.10-031010-generic_3.10.10-031010.201308291422_amd64.deb
sudo dpkg -i linux-headers-3.10.10-*.deb linux-image-3.10.10*.deb
重启操作系统，运行dockerd
/usr/local/docker/dockerd --data-root=/data1/docker
ERRO[2018-12-23T13:25:08.192898199+08:00] Handler for POST /v1.37/containers/965bfd8d50f79cc115aad1cd87bc3449e79033964f26acd8c4884fbbbae6b2eb/start returned error: Could not check if docker-default AppArmor profile was loaded: open /sys/kernel/security/apparmor/profiles: no such file or directory
经查，可能原因是我在升级内核时，有些问题：
open /sys/kernel/security/apparmor/profiles: no such file or directory
可能原因：
Not all patches were applied or userspace/kernel mismatch
取消apparmor
$ sudo mkdir -p /etc/default/grub.d
$ echo 'GRUB_CMDLINE_LINUX_DEFAULT="$GRUB_CMDLINE_LINUX_DEFAULT apparmor=0"' \
| sudo tee /etc/default/grub.d/apparmor.cfg
$ sudo update-grub
$ sudo reboot
再次启动dockerd，再次运行hello-world容器成功了。
root@herrypc:~# docker run hello-world
Hello from Docker!
This message shows that your installation appears to be working correctly.
To generate this message, Docker took the following steps:
1. The Docker client contacted the Docker daemon.
2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
(amd64)
3. The Docker daemon created a new container from that image which runs the
executable that produces the output you are currently reading.
4. The Docker daemon streamed that output to the Docker client, which sent it
to your terminal.
To try something more ambitious, you can run an Ubuntu container with:
$ docker run -it ubuntu bash
Share images, automate workflows, and more with a free Docker ID:
https://hub.docker.com/
For more examples and ideas, visit:
https://docs.docker.com/get-started/
root@herrypc:~#