Docker 也可直接在 FreeBSD 上使用（官方支持）
Docker on FreeBSD 是 Docker 在 FreeBSD 系统上的移植版本。Docker 原本是为 Linux 所开发设计，而最新的 FreeBSD 11-CURRENT 和 10.2 将提供对 Docker 的支持。该系统严重依赖 ZFS、jail 以及 64位的 Linux 兼容层。
安装和使用方法：
# pkg install docker-freebsd ca_root_nss
...
New packages to be INSTALLED:
docker-freebsd: 06252015
ca_root_nss: 3.19.1_1
bash: 4.3.39_2
indexinfo: 0.2.3
gettext-runtime: 0.19.4
go: 1.4.2,1
sqlite3: 3.8.10.2
readline: 6.3.8
The process will require 155 MiB more space.
26 MiB to be downloaded.
...
You will need to create a ZFS dataset on /usr/docker
# zfs create -o mountpoint=/usr/docker <zroot>/docker
And lastly enable the docker daemon
# sysrc -f /etc/rc.conf docker_enable="YES"
# service docker start
启动信息：
# service docker onestart
Starting docker...
# docker version
Client version: 1.7.0-dev
Client API version: 1.19
Go version (client): go1.4.2
Git commit (client): 582db78
OS/Arch (client): freebsd/amd64
Server version: 1.7.0-dev
Server API version: 1.19
Go version (server): go1.4.2
Git commit (server): 582db78
OS/Arch (server): freebsd/amd64
# docker search centos
NAME DESCRIPTION STARS OFFICIAL AUTOMATED
centos The official build of CentOS. 1122 [OK]
ansible/centos7-ansible Ansible on Centos7 45 [OK]
...
# docker pull centos
latest: Pulling from centos
f1b10cd84249: Pull complete
c852f6d61e65: Pull complete
7322fbe74aa5: Already exists
centos:latest: The image you are pulling has been verified. Important: image verification is a tech preview feature and should not be relied on to provide security.
Digest: sha256:57554136c655abb33ecb7bb790b1db0279668d3763c3b81f31bc6c4e60e4a1f3
Status: Downloaded newer image for centos:latest
# docker images
REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE
centos latest 7322fbe74aa5 4 weeks ago 172.2 MB
# docker run -t -i centos /bin/bash
[root@ /]# uname -a
Linux 2.6.32 FreeBSD 11.0-CURRENT #5 r285594: Tue Jul 14 23:30:11 EDT 2015 x86_64 x86_64 x86_64 GNU/Linux
运行状态：
# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
920bc5fbb45c centos "/bin/bash" 9 seconds ago Up 8 seconds jolly_poincare
# jls
JID IP Address Hostname Path
3 172.17.0.3 /usr/docker/zfs/graph/920bc5fbb45c
# zfs list
...
zroot/docker 119M 107G 6.02M /usr/docker
zroot/docker/03a7a57df9197f242484375c4bc2149248ded5aaafc4feb8e472d6774d495530 8K 107G 112M legacy
zroot/docker/03a7a57df9197f242484375c4bc2149248ded5aaafc4feb8e472d6774d495530-init 128K 107G 112M legacy
...
# mount
...
x220i/docker on /usr/docker (zfs, local, noatime, nfsv4acls)
x220i/docker/d03bcd7082d91179f58c8738f598f5af4db00307a47b5db255aefd30790e8bdc on /usr/docker/zfs/graph/d03bcd7082d9 (zfs, local, noatime, nfsv4acls)
linprocfs on /usr/docker/zfs/graph/d03bcd7082d9/proc (linprocfs, local)
linsysfs on /usr/docker/zfs/graph/d03bcd7082d9/sys (linsysfs, local)
devfs on /usr/docker/zfs/graph/d03bcd7082d9/dev (devfs, local, multilabel)
Docker 下的 FreeBSD：
# docker search freebsd
NAME DESCRIPTION STARS OFFICIAL AUTOMATED
...
lexaguskov/freebsd FreeBSD operating system 0
...
# docker pull lexaguskov/freebsd
...
Status: Downloaded newer image for lexaguskov/freebsd:latest
# docker run -t -i lexaguskov/freebsd /bin/csh
#
# df -h
Filesystem Size Used Avail Capacity Mounted on
zroot/docker/485f9654f69d5e9909344dd823dd0608f3734c433b667e9ec04492cc61ddbcfa 107G 176M 107G 0% /
网络：
# docker run -t -i centos ping -c2 8.8.8.8
WARNING: setsockopt(ICMP_FILTER): Protocol not available
WARNING: your kernel is veeery old. No problems.
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
64 bytes from 8.8.8.8: icmp_seq=1 ttl=56 time=15.0 ms
64 bytes from 8.8.8.8: icmp_seq=2 ttl=56 time=14.1 ms
...
# docker run -t -i centos /bin/bash
echo "nameserver 8.8.8.8" >> /etc/resolv.conf
...
ping sun.com
PING sun.com (156.151.59.35) 56(84) bytes of data.
64 bytes from lb-legacy-sun-cms-ucf.oracle.com (156.151.59.35): icmp_seq=1 ttl=244 time=51.5 ms
...
