Kernel Requirements
===================
If you want to have a full working CRUX+Docker system you will need to rebuild your kernel with the following options enabled:
Networking:
- CONFIG_BRIDGE
- CONFIG_NETFILTER_XT_MATCH_ADDRTYPE
- CONFIG_NF_NAT
- CONFIG_NF_NAT_IPV4
- CONFIG_NF_NAT_NEEDED
LVM:
- CONFIG_BLK_DEV_DM
- CONFIG_DM_THIN_PROVISIONING
- CONFIG_EXT4_FS
Namespaces:
- CONFIG_NAMESPACES
- CONFIG_UTS_NS
- CONFIG_IPC_NS
- CONFIG_UID_NS
- CONFIG_PID_NS
- CONFIG_NET_NS
Cgroups:
- CONFIG_CGROUPS
Cgroups Controllers (*optional but highly recommended*):
- CONFIG_CGROUP_CPUACCT
- CONFIG_BLK_CGROUP
- CONFIG_MEMCG
- CONFIG_MEMCG_SWAP
You may check your kernel configuration by running the provided ``test_kernel_config.sh`` script against your kernel configuration:
::
./test_kernel_config.sh /usr/src/linux/.config
Other Requirements
==================
You **must** have the following ``cgroup`` mount point mounted:
::
none /cgroup cgroup defaults 0 0
Storage Backends
================
Docker comes with three main Storage Backends:
- AUFS (*requires AUFS kernel/patches*)
- devmapper
- btrfs
It is recommended you use the devmapper or btrfs backend (Default: devmapper).
To use the ``btrfs`` backend edit ``/etc/docker.conf`` and modify the ``DOCKER_OPTS`` with:
::
DOCKER_OPTS="-s btrfs"
Docker Client
=============
The provided Docker rc script changes the group ownership of the ``/var/run/socker.sock`` UNIX Socket to ``docker``.
Add yourself to this group if you wish to access the Docker daemon on localhost via UNIX Socker.
