Bocker is a Docker implemented with only 100 lines of Bash, or around that.
Prerequisites
The necessary packages for you to be able to run Bocker (the dependencies) are:
- btrfs-progs
- curl
- iproute2
- iptables
- libcgroup-tools
- util-linux> = 2.25.2
- coreutils> = 7.5
Since most distributions do not provide a new enough version of util-linux, you will probably need to take the sources from here and compile them yourself.
In addition, your system will need to be configured with the following:
A btrfs file system mounted on /var/bocker
- A bridge mode network named
bridge0and an IP of10.0.0.1/24 - IP forwarding enabled in
/proc/sys/net/ipv4/ip_forward - A firewall routing
bridge0traffic to a physical interface.
For ease of use, a Vagrantfile is included, which will create the necessary environment.
Even if you meet the above prerequisites, you can probably still run Bocker on a virtual machine. Bocker runs as root and, among other things, needs to make changes to its network interfaces, routing table and firewall rules. According to the developer, it is guaranteed that this will not destroy your system.
Example of use
$ bocker pull centos 7
######################################################################## 100.0%
######################################################################## 100.0%
######################################################################## 100.0%
Created: img_42150
$ bocker images
IMAGE_ID SOURCE
img_42150 centos:7
$ bocker run img_42150 cat /etc/centos-release
CentOS Linux release 7.1.1503 (Core)
$ bocker ps
CONTAINER_ID COMMAND
ps_42045 cat /etc/centos-release
$ bocker logs ps_42045
CentOS Linux release 7.1.1503 (Core)
$ bocker rm ps_42045
Removed: ps_42045
$ bocker run img_42150 which wget
which: no wget in (/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin)
$ bocker run img_42150 yum install -y wget
Installing : wget-1.14-10.el7_0.1.x86_64 1/1
Verifying : wget-1.14-10.el7_0.1.x86_64 1/1
Installed : wget.x86_64 0:1.14-10.el7_0.1
Complete!
$ bocker ps
CONTAINER_ID COMMAND
ps_42018 yum install -y wget
ps_42182 which wget
$ bocker commit ps_42018 img_42150
Removed: img_42150
Created: img_42150
$ bocker run img_42150 which wget
/usr/bin/wget
$ bocker run img_42150 cat /proc/1/cgroup
...
4:memory:/ps_42152
3:cpuacct,cpu:/ps_42152
$ cat /sys/fs/cgroup/cpu/ps_42152/cpu.shares
512
$ cat /sys/fs/cgroup/memory/ps_42152/memory.limit_in_bytes
512000000
$ BOCKER_CPU_SHARE=1024 \
BOCKER_MEM_LIMIT=1024 \
bocker run img_42150 cat /proc/1/cgroup
...
4:memory:/ps_42188
3:cpuacct,cpu:/ps_42188
$ cat /sys/fs/cgroup/cpu/ps_42188/cpu.shares
1024
$ cat /sys/fs/cgroup/memory/ps_42188/memory.limit_in_bytes
1024000000Functionalities
Currently implemented
- docker build †
- docker pull
- docker images
- ps docker
- docker run
- docker exec
- docker logs
- docker commit
- rm docker/rmi docker
- Networking
- Support/CGroups Quota
Not implemented
- Data Volume Containers
- Date Volumes
- Port Forwarding
License
The Bocker license is GPL-3.0 License and the official project page is on GitHub: https://github.com/p8952/bocker
