configs

package
Version: v1.0.0 Latest Latest
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Published: Jun 18, 2015 License: Apache-2.0, Apache-2.0 Imports: 3 Imported by: 0

Documentation

Index

Constants

View Source
const (
	Wildcard = -1
)

Variables

View Source
var (
	// These are devices that are to be both allowed and created.
	DefaultSimpleDevices = []*Device{

		{
			Path:        "/dev/null",
			Type:        'c',
			Major:       1,
			Minor:       3,
			Permissions: "rwm",
			FileMode:    0666,
		},
		{
			Path:        "/dev/zero",
			Type:        'c',
			Major:       1,
			Minor:       5,
			Permissions: "rwm",
			FileMode:    0666,
		},

		{
			Path:        "/dev/full",
			Type:        'c',
			Major:       1,
			Minor:       7,
			Permissions: "rwm",
			FileMode:    0666,
		},

		{
			Path:        "/dev/tty",
			Type:        'c',
			Major:       5,
			Minor:       0,
			Permissions: "rwm",
			FileMode:    0666,
		},

		{
			Path:        "/dev/urandom",
			Type:        'c',
			Major:       1,
			Minor:       9,
			Permissions: "rwm",
			FileMode:    0666,
		},
		{
			Path:        "/dev/random",
			Type:        'c',
			Major:       1,
			Minor:       8,
			Permissions: "rwm",
			FileMode:    0666,
		},
	}
	DefaultAllowedDevices = append([]*Device{

		{
			Type:        'c',
			Major:       Wildcard,
			Minor:       Wildcard,
			Permissions: "m",
		},
		{
			Type:        'b',
			Major:       Wildcard,
			Minor:       Wildcard,
			Permissions: "m",
		},

		{
			Path:        "/dev/console",
			Type:        'c',
			Major:       5,
			Minor:       1,
			Permissions: "rwm",
		},
		{
			Path:        "/dev/tty0",
			Type:        'c',
			Major:       4,
			Minor:       0,
			Permissions: "rwm",
		},
		{
			Path:        "/dev/tty1",
			Type:        'c',
			Major:       4,
			Minor:       1,
			Permissions: "rwm",
		},

		{
			Path:        "",
			Type:        'c',
			Major:       136,
			Minor:       Wildcard,
			Permissions: "rwm",
		},
		{
			Path:        "",
			Type:        'c',
			Major:       5,
			Minor:       2,
			Permissions: "rwm",
		},

		{
			Path:        "",
			Type:        'c',
			Major:       10,
			Minor:       200,
			Permissions: "rwm",
		},
	}, DefaultSimpleDevices...)
	DefaultAutoCreatedDevices = append([]*Device{
		{

			Path:        "/dev/fuse",
			Type:        'c',
			Major:       10,
			Minor:       229,
			Permissions: "rwm",
		},
	}, DefaultSimpleDevices...)
)

Functions

This section is empty.

Types

type Cgroup

type Cgroup struct {
	Name string `json:"name"`

	// name of parent cgroup or slice
	Parent string `json:"parent"`

	// If this is true allow access to any kind of device within the container.  If false, allow access only to devices explicitly listed in the allowed_devices list.
	AllowAllDevices bool `json:"allow_all_devices"`

	AllowedDevices []*Device `json:"allowed_devices"`

	// Memory limit (in bytes)
	Memory int64 `json:"memory"`

	// Memory reservation or soft_limit (in bytes)
	MemoryReservation int64 `json:"memory_reservation"`

	// Total memory usage (memory + swap); set `-1' to disable swap
	MemorySwap int64 `json:"memory_swap"`

	// CPU shares (relative weight vs. other containers)
	CpuShares int64 `json:"cpu_shares"`

	// CPU hardcap limit (in usecs). Allowed cpu time in a given period.
	CpuQuota int64 `json:"cpu_quota"`

	// CPU period to be used for hardcapping (in usecs). 0 to use system default.
	CpuPeriod int64 `json:"cpu_period"`

	// CPU to use
	CpusetCpus string `json:"cpuset_cpus"`

	// MEM to use
	CpusetMems string `json:"cpuset_mems"`

	// Specifies per cgroup weight, range is from 10 to 1000.
	BlkioWeight int64 `json:"blkio_weight"`

	// Weight per cgroup per device, can override BlkioWeight.
	BlkioWeightDevice string `json:"blkio_weight_device"`

	// set the freeze value for the process
	Freezer FreezerState `json:"freezer"`

	// Parent slice to use for systemd TODO: remove in favor or parent
	Slice string `json:"slice"`

	// Whether to disable OOM Killer
	OomKillDisable bool `json:"oom_kill_disable"`
}

type Config

type Config struct {
	// NoPivotRoot will use MS_MOVE and a chroot to jail the process into the container's rootfs
	// This is a common option when the container is running in ramdisk
	NoPivotRoot bool `json:"no_pivot_root"`

	// ParentDeathSignal specifies the signal that is sent to the container's process in the case
	// that the parent process dies.
	ParentDeathSignal int `json:"parent_death_signal"`

	// PivotDir allows a custom directory inside the container's root filesystem to be used as pivot, when NoPivotRoot is not set.
	// When a custom PivotDir not set, a temporary dir inside the root filesystem will be used. The pivot dir needs to be writeable.
	// This is required when using read only root filesystems. In these cases, a read/writeable path can be (bind) mounted somewhere inside the root filesystem to act as pivot.
	PivotDir string `json:"pivot_dir"`

	// Path to a directory containing the container's root filesystem.
	Rootfs string `json:"rootfs"`

	// Readonlyfs will remount the container's rootfs as readonly where only externally mounted
	// bind mounts are writtable.
	Readonlyfs bool `json:"readonlyfs"`

	// Mounts specify additional source and destination paths that will be mounted inside the container's
	// rootfs and mount namespace if specified
	Mounts []*Mount `json:"mounts"`

	// The device nodes that should be automatically created within the container upon container start.  Note, make sure that the node is marked as allowed in the cgroup as well!
	Devices []*Device `json:"devices"`

	MountLabel string `json:"mount_label"`

	// Hostname optionally sets the container's hostname if provided
	Hostname string `json:"hostname"`

	// Namespaces specifies the container's namespaces that it should setup when cloning the init process
	// If a namespace is not provided that namespace is shared from the container's parent process
	Namespaces Namespaces `json:"namespaces"`

	// Capabilities specify the capabilities to keep when executing the process inside the container
	// All capbilities not specified will be dropped from the processes capability mask
	Capabilities []string `json:"capabilities"`

	// Networks specifies the container's network setup to be created
	Networks []*Network `json:"networks"`

	// Routes can be specified to create entries in the route table as the container is started
	Routes []*Route `json:"routes"`

	// Cgroups specifies specific cgroup settings for the various subsystems that the container is
	// placed into to limit the resources the container has available
	Cgroups *Cgroup `json:"cgroups"`

	// AppArmorProfile specifies the profile to apply to the process running in the container and is
	// change at the time the process is execed
	AppArmorProfile string `json:"apparmor_profile"`

	// ProcessLabel specifies the label to apply to the process running in the container.  It is
	// commonly used by selinux
	ProcessLabel string `json:"process_label"`

	// Rlimits specifies the resource limits, such as max open files, to set in the container
	// If Rlimits are not set, the container will inherit rlimits from the parent process
	Rlimits []Rlimit `json:"rlimits"`

	// AdditionalGroups specifies the gids that should be added to supplementary groups
	// in addition to those that the user belongs to.
	AdditionalGroups []int `json:"additional_groups"`

	// UidMappings is an array of User ID mappings for User Namespaces
	UidMappings []IDMap `json:"uid_mappings"`

	// GidMappings is an array of Group ID mappings for User Namespaces
	GidMappings []IDMap `json:"gid_mappings"`

	// MaskPaths specifies paths within the container's rootfs to mask over with a bind
	// mount pointing to /dev/null as to prevent reads of the file.
	MaskPaths []string `json:"mask_paths"`

	// ReadonlyPaths specifies paths within the container's rootfs to remount as read-only
	// so that these files prevent any writes.
	ReadonlyPaths []string `json:"readonly_paths"`
}

Config defines configuration options for executing a process inside a contained environment.

func (Config) HostGID

func (c Config) HostGID() (int, error)

Gets the root uid for the process on host which could be non-zero when user namespaces are enabled.

func (Config) HostUID

func (c Config) HostUID() (int, error)

Gets the root uid for the process on host which could be non-zero when user namespaces are enabled.

type Device

type Device struct {
	// Device type, block, char, etc.
	Type rune `json:"type"`

	// Path to the device.
	Path string `json:"path"`

	// Major is the device's major number.
	Major int64 `json:"major"`

	// Minor is the device's minor number.
	Minor int64 `json:"minor"`

	// Cgroup permissions format, rwm.
	Permissions string `json:"permissions"`

	// FileMode permission bits for the device.
	FileMode os.FileMode `json:"file_mode"`

	// Uid of the device.
	Uid uint32 `json:"uid"`

	// Gid of the device.
	Gid uint32 `json:"gid"`
}

func (*Device) CgroupString

func (d *Device) CgroupString() string

func (*Device) Mkdev

func (d *Device) Mkdev() int

type FreezerState

type FreezerState string
const (
	Undefined FreezerState = ""
	Frozen    FreezerState = "FROZEN"
	Thawed    FreezerState = "THAWED"
)

type IDMap

type IDMap struct {
	ContainerID int `json:"container_id"`
	HostID      int `json:"host_id"`
	Size        int `json:"size"`
}

IDMap represents UID/GID Mappings for User Namespaces.

type Mount

type Mount struct {
	// Source path for the mount.
	Source string `json:"source"`

	// Destination path for the mount inside the container.
	Destination string `json:"destination"`

	// Device the mount is for.
	Device string `json:"device"`

	// Mount flags.
	Flags int `json:"flags"`

	// Mount data applied to the mount.
	Data string `json:"data"`

	// Relabel source if set, "z" indicates shared, "Z" indicates unshared.
	Relabel string `json:"relabel"`
}

type Namespace

type Namespace struct {
	Type NamespaceType `json:"type"`
	Path string        `json:"path"`
}

Namespace defines configuration for each namespace. It specifies an alternate path that is able to be joined via setns.

func (*Namespace) GetPath

func (n *Namespace) GetPath(pid int) string

func (*Namespace) Syscall

func (n *Namespace) Syscall() int

type NamespaceType

type NamespaceType string
const (
	NEWNET  NamespaceType = "NEWNET"
	NEWPID  NamespaceType = "NEWPID"
	NEWNS   NamespaceType = "NEWNS"
	NEWUTS  NamespaceType = "NEWUTS"
	NEWIPC  NamespaceType = "NEWIPC"
	NEWUSER NamespaceType = "NEWUSER"
)

func NamespaceTypes

func NamespaceTypes() []NamespaceType

type Namespaces

type Namespaces []Namespace

func (*Namespaces) Add

func (n *Namespaces) Add(t NamespaceType, path string)

func (*Namespaces) CloneFlags

func (n *Namespaces) CloneFlags() uintptr

CloneFlags parses the container's Namespaces options to set the correct flags on clone, unshare. This functions returns flags only for new namespaces.

func (*Namespaces) Contains

func (n *Namespaces) Contains(t NamespaceType) bool

func (*Namespaces) Remove

func (n *Namespaces) Remove(t NamespaceType) bool

type Network

type Network struct {
	// Type sets the networks type, commonly veth and loopback
	Type string `json:"type"`

	// Name of the network interface
	Name string `json:"name"`

	// The bridge to use.
	Bridge string `json:"bridge"`

	// MacAddress contains the MAC address to set on the network interface
	MacAddress string `json:"mac_address"`

	// Address contains the IPv4 and mask to set on the network interface
	Address string `json:"address"`

	// Gateway sets the gateway address that is used as the default for the interface
	Gateway string `json:"gateway"`

	// IPv6Address contains the IPv6 and mask to set on the network interface
	IPv6Address string `json:"ipv6_address"`

	// IPv6Gateway sets the ipv6 gateway address that is used as the default for the interface
	IPv6Gateway string `json:"ipv6_gateway"`

	// Mtu sets the mtu value for the interface and will be mirrored on both the host and
	// container's interfaces if a pair is created, specifically in the case of type veth
	// Note: This does not apply to loopback interfaces.
	Mtu int `json:"mtu"`

	// TxQueueLen sets the tx_queuelen value for the interface and will be mirrored on both the host and
	// container's interfaces if a pair is created, specifically in the case of type veth
	// Note: This does not apply to loopback interfaces.
	TxQueueLen int `json:"txqueuelen"`

	// HostInterfaceName is a unique name of a veth pair that resides on in the host interface of the
	// container.
	HostInterfaceName string `json:"host_interface_name"`

	// HairpinMode specifies if hairpin NAT should be enabled on the virtual interface
	// bridge port in the case of type veth
	// Note: This is unsupported on some systems.
	// Note: This does not apply to loopback interfaces.
	HairpinMode bool `json:"hairpin_mode"`
}

Network defines configuration for a container's networking stack

The network configuration can be omited from a container causing the container to be setup with the host's networking stack

type Rlimit

type Rlimit struct {
	Type int    `json:"type"`
	Hard uint64 `json:"hard"`
	Soft uint64 `json:"soft"`
}

type Route

type Route struct {
	// Sets the destination and mask, should be a CIDR.  Accepts IPv4 and IPv6
	Destination string `json:"destination"`

	// Sets the source and mask, should be a CIDR.  Accepts IPv4 and IPv6
	Source string `json:"source"`

	// Sets the gateway.  Accepts IPv4 and IPv6
	Gateway string `json:"gateway"`

	// The device to set this route up for, for example: eth0
	InterfaceName string `json:"interface_name"`
}

Routes can be specified to create entries in the route table as the container is started

All of destination, source, and gateway should be either IPv4 or IPv6. One of the three options must be present, and ommitted entries will use their IP family default for the route table. For IPv4 for example, setting the gateway to 1.2.3.4 and the interface to eth0 will set up a standard destination of 0.0.0.0(or *) when viewed in the route table.

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