Documentation ¶
Index ¶
- Constants
- Variables
- type Action
- type Arch
- type Arg
- type BlockIO
- type CPU
- type Device
- type DeviceCgroup
- type Hook
- type Hooks
- type HugepageLimit
- type IDMapping
- type InterfacePriority
- type Linux
- type Memory
- type Mount
- type Namespace
- type NamespaceType
- type Network
- type Operator
- type Pids
- type Platform
- type Process
- type Resources
- type Rlimit
- type Root
- type Seccomp
- type Spec
- type State
- type Syscall
- type ThrottleDevice
- type User
- type WeightDevice
Constants ¶
const ( // PIDNamespace for isolating process IDs PIDNamespace NamespaceType = "pid" // NetworkNamespace for isolating network devices, stacks, ports, etc NetworkNamespace = "network" // MountNamespace for isolating mount points MountNamespace = "mount" // IPCNamespace for isolating System V IPC, POSIX message queues IPCNamespace = "ipc" // UTSNamespace for isolating hostname and NIS domain name UTSNamespace = "uts" // UserNamespace for isolating user and group IDs UserNamespace = "user" )
const ( // VersionMajor is for an API incompatible changes VersionMajor = 0 // VersionMinor is for functionality in a backwards-compatible manner VersionMinor = 4 // VersionPatch is for backwards-compatible bug fixes VersionPatch = 0 // VersionDev indicates development branch. Releases will be empty string. VersionDev = "" )
Variables ¶
var Version = fmt.Sprintf("%d.%d.%d%s", VersionMajor, VersionMinor, VersionPatch, VersionDev)
Version is the specification version that the package types support.
Functions ¶
This section is empty.
Types ¶
type Arch ¶
type Arch string
Arch used for additional architectures
const ( ArchX86 Arch = "SCMP_ARCH_X86" ArchX86_64 Arch = "SCMP_ARCH_X86_64" ArchX32 Arch = "SCMP_ARCH_X32" ArchARM Arch = "SCMP_ARCH_ARM" ArchAARCH64 Arch = "SCMP_ARCH_AARCH64" ArchMIPS Arch = "SCMP_ARCH_MIPS" ArchMIPS64 Arch = "SCMP_ARCH_MIPS64" ArchMIPS64N32 Arch = "SCMP_ARCH_MIPS64N32" ArchMIPSEL Arch = "SCMP_ARCH_MIPSEL" ArchMIPSEL64 Arch = "SCMP_ARCH_MIPSEL64" ArchMIPSEL64N32 Arch = "SCMP_ARCH_MIPSEL64N32" )
Additional architectures permitted to be used for system calls By default only the native architecture of the kernel is permitted
type Arg ¶
type Arg struct { Index uint `json:"index"` Value uint64 `json:"value"` ValueTwo uint64 `json:"valueTwo"` Op Operator `json:"op"` }
Arg used for matching specific syscall arguments in Seccomp
type BlockIO ¶
type BlockIO struct { // Specifies per cgroup weight, range is from 10 to 1000 Weight *uint16 `json:"blkioWeight,omitempty"` // Specifies tasks' weight in the given cgroup while competing with the cgroup's child cgroups, range is from 10 to 1000, CFQ scheduler only LeafWeight *uint16 `json:"blkioLeafWeight,omitempty"` // Weight per cgroup per device, can override BlkioWeight WeightDevice []WeightDevice `json:"blkioWeightDevice,omitempty"` // IO read rate limit per cgroup per device, bytes per second ThrottleReadBpsDevice []ThrottleDevice `json:"blkioThrottleReadBpsDevice,omitempty"` // IO write rate limit per cgroup per device, bytes per second ThrottleWriteBpsDevice []ThrottleDevice `json:"blkioThrottleWriteBpsDevice,omitempty"` // IO read rate limit per cgroup per device, IO per second ThrottleReadIOPSDevice []ThrottleDevice `json:"blkioThrottleReadIOPSDevice,omitempty"` // IO write rate limit per cgroup per device, IO per second ThrottleWriteIOPSDevice []ThrottleDevice `json:"blkioThrottleWriteIOPSDevice,omitempty"` }
BlockIO for Linux cgroup 'blkio' resource management
type CPU ¶
type CPU struct { uint64 `json:"shares,omitempty"` // CPU hardcap limit (in usecs). Allowed cpu time in a given period. Quota *uint64 `json:"quota,omitempty"` // CPU period to be used for hardcapping (in usecs). Period *uint64 `json:"period,omitempty"` // How much time realtime scheduling may use (in usecs). RealtimeRuntime *uint64 `json:"realtimeRuntime,omitempty"` // CPU period to be used for realtime scheduling (in usecs). RealtimePeriod *uint64 `json:"realtimePeriod,omitempty"` // CPUs to use within the cpuset. Default is to use any CPU available. Cpus *string `json:"cpus,omitempty"` // List of memory nodes in the cpuset. Default is to use any available memory node. Mems *string `json:"mems,omitempty"` }Shares *
CPU for Linux cgroup 'cpu' resource management
type Device ¶
type Device struct { // Path to the device. Path string `json:"path"` // Device type, block, char, etc. Type string `json:"type"` // Major is the device's major number. Major int64 `json:"major"` // Minor is the device's minor number. Minor int64 `json:"minor"` // FileMode permission bits for the device. FileMode *os.FileMode `json:"fileMode,omitempty"` // UID of the device. UID *uint32 `json:"uid,omitempty"` // Gid of the device. GID *uint32 `json:"gid,omitempty"` }
Device represents the mknod information for a Linux special device file
type DeviceCgroup ¶
type DeviceCgroup struct { // Allow or deny Allow bool `json:"allow"` // Device type, block, char, etc. Type *string `json:"type,omitempty"` // Major is the device's major number. Major *int64 `json:"major,omitempty"` // Minor is the device's minor number. Minor *int64 `json:"minor,omitempty"` // Cgroup access permissions format, rwm. Access *string `json:"access,omitempty"` }
DeviceCgroup represents a device rule for the whitelist controller
type Hook ¶
type Hook struct { Path string `json:"path"` Args []string `json:"args,omitempty"` Env []string `json:"env,omitempty"` }
Hook specifies a command that is run at a particular event in the lifecycle of a container
type Hooks ¶
type Hooks struct { // Prestart is a list of hooks to be run before the container process is executed. // On Linux, they are run after the container namespaces are created. Prestart []Hook `json:"prestart,omitempty"` // Poststart is a list of hooks to be run after the container process is started. Poststart []Hook `json:"poststart,omitempty"` // Poststop is a list of hooks to be run after the container process exits. Poststop []Hook `json:"poststop,omitempty"` }
Hooks for container setup and teardown
type HugepageLimit ¶
type HugepageLimit struct { // Pagesize is the hugepage size Pagesize *string `json:"pageSize,omitempty"` // Limit is the limit of "hugepagesize" hugetlb usage Limit *uint64 `json:"limit,omitempty"` }
HugepageLimit structure corresponds to limiting kernel hugepages
type IDMapping ¶
type IDMapping struct { // HostID is the UID/GID of the host user or group HostID uint32 `json:"hostID"` // ContainerID is the UID/GID of the container's user or group ContainerID uint32 `json:"containerID"` // Size is the length of the range of IDs mapped between the two namespaces Size uint32 `json:"size"` }
IDMapping specifies UID/GID mappings
type InterfacePriority ¶
type InterfacePriority struct { // Name is the name of the network interface Name string `json:"name"` // Priority for the interface Priority uint32 `json:"priority"` }
InterfacePriority for network interfaces
type Linux ¶
type Linux struct { // UIDMapping specifies user mappings for supporting user namespaces on Linux. UIDMappings []IDMapping `json:"uidMappings,omitempty"` // GIDMapping specifies group mappings for supporting user namespaces on Linux. GIDMappings []IDMapping `json:"gidMappings,omitempty"` // Sysctl are a set of key value pairs that are set for the container on start Sysctl map[string]string `json:"sysctl,omitempty"` // Resources contain cgroup information for handling resource constraints // for the container Resources *Resources `json:"resources,omitempty"` // CgroupsPath specifies the path to cgroups that are created and/or joined by the container. // The path is expected to be relative to the cgroups mountpoint. // If resources are specified, the cgroups at CgroupsPath will be updated based on resources. CgroupsPath *string `json:"cgroupsPath,omitempty"` // Namespaces contains the namespaces that are created and/or joined by the container Namespaces []Namespace `json:"namespaces"` // Devices are a list of device nodes that are created for the container Devices []Device `json:"devices"` // Seccomp specifies the seccomp security settings for the container. Seccomp *Seccomp `json:"seccomp,omitempty"` // RootfsPropagation is the rootfs mount propagation mode for the container. RootfsPropagation string `json:"rootfsPropagation,omitempty"` }
Linux contains platform specific configuration for Linux based containers.
type Memory ¶
type Memory struct { // Memory limit (in bytes). Limit *uint64 `json:"limit,omitempty"` // Memory reservation or soft_limit (in bytes). Reservation *uint64 `json:"reservation,omitempty"` // Total memory limit (memory + swap). Swap *uint64 `json:"swap,omitempty"` // Kernel memory limit (in bytes). Kernel *uint64 `json:"kernel,omitempty"` // Kernel memory limit for tcp (in bytes) KernelTCP *uint64 `json:"kernelTCP"` // How aggressive the kernel will swap memory pages. Range from 0 to 100. Swappiness *uint64 `json:"swappiness,omitempty"` }
Memory for Linux cgroup 'memory' resource management
type Mount ¶
type Mount struct { // Destination is the path where the mount will be placed relative to the container's root. The path and child directories MUST exist, a runtime MUST NOT create directories automatically to a mount point. Destination string `json:"destination"` // Type specifies the mount kind. Type string `json:"type"` // Source specifies the source path of the mount. In the case of bind mounts on // Linux based systems this would be the file on the host. Source string `json:"source"` // Options are fstab style mount options. Options []string `json:"options,omitempty"` }
Mount specifies a mount for a container.
type Namespace ¶
type Namespace struct { // Type is the type of Linux namespace Type NamespaceType `json:"type"` // Path is a path to an existing namespace persisted on disk that can be joined // and is of the same type Path string `json:"path,omitempty"` }
Namespace is the configuration for a Linux namespace
type Network ¶
type Network struct { // Set class identifier for container's network packets ClassID *uint32 `json:"classID"` // Set priority of network traffic for container Priorities []InterfacePriority `json:"priorities,omitempty"` }
Network identification and priority configuration
type Operator ¶
type Operator string
Operator used to match syscall arguments in Seccomp
const ( OpNotEqual Operator = "SCMP_CMP_NE" OpLessThan Operator = "SCMP_CMP_LT" OpLessEqual Operator = "SCMP_CMP_LE" OpEqualTo Operator = "SCMP_CMP_EQ" OpGreaterEqual Operator = "SCMP_CMP_GE" OpGreaterThan Operator = "SCMP_CMP_GT" OpMaskedEqual Operator = "SCMP_CMP_MASKED_EQ" )
Define operators for syscall arguments in Seccomp
type Pids ¶
type Pids struct { // Maximum number of PIDs. Default is "no limit". Limit *int64 `json:"limit,omitempty"` }
Pids for Linux cgroup 'pids' resource management (Linux 4.3)
type Platform ¶
type Platform struct { // OS is the operating system. OS string `json:"os"` // Arch is the architecture Arch string `json:"arch"` }
Platform specifies OS and arch information for the host system that the container is created for.
type Process ¶
type Process struct { // Terminal creates an interactive terminal for the container. Terminal bool `json:"terminal"` // User specifies user information for the process. User User `json:"user"` // Args specifies the binary and arguments for the application to execute. Args []string `json:"args"` // Env populates the process environment for the process. Env []string `json:"env,omitempty"` // Cwd is the current working directory for the process and must be // relative to the container's root. Cwd string `json:"cwd"` // Capabilities are Linux capabilities that are kept for the container. Capabilities []string `json:"capabilities,omitempty" platform:"linux"` // Rlimits specifies rlimit options to apply to the process. Rlimits []Rlimit `json:"rlimits,omitempty"` // NoNewPrivileges controls whether additional privileges could be gained by processes in the container. NoNewPrivileges bool `json:"noNewPrivileges,omitempty"` // ApparmorProfile specified the apparmor profile for the container. (this field is platform dependent) ApparmorProfile string `json:"apparmorProfile,omitempty" platform:"linux"` // SelinuxProcessLabel specifies the selinux context that the container process is run as. (this field is platform dependent) SelinuxLabel string `json:"selinuxLabel,omitempty" platform:"linux"` }
Process contains information to start a specific application inside the container.
type Resources ¶
type Resources struct { // Devices are a list of device rules for the whitelist controller Devices []DeviceCgroup `json:"devices"` // DisableOOMKiller disables the OOM killer for out of memory conditions DisableOOMKiller *bool `json:"disableOOMKiller,omitempty"` // Specify an oom_score_adj for the container. OOMScoreAdj *int `json:"oomScoreAdj,omitempty"` // Memory restriction configuration Memory *Memory `json:"memory,omitempty"` // CPU resource restriction configuration CPU *CPU `json:"cpu,omitempty"` // Task resource restriction configuration. Pids *Pids `json:"pids,omitempty"` // BlockIO restriction configuration BlockIO *BlockIO `json:"blockIO,omitempty"` // Hugetlb limit (in bytes) HugepageLimits []HugepageLimit `json:"hugepageLimits,omitempty"` // Network restriction configuration Network *Network `json:"network,omitempty"` }
Resources has container runtime resource constraints
type Rlimit ¶
type Rlimit struct { // Type of the rlimit to set Type string `json:"type"` // Hard is the hard limit for the specified type Hard uint64 `json:"hard"` // Soft is the soft limit for the specified type Soft uint64 `json:"soft"` }
Rlimit type and restrictions
type Root ¶
type Root struct { // Path is the absolute path to the container's root filesystem. Path string `json:"path"` // Readonly makes the root filesystem for the container readonly before the process is executed. Readonly bool `json:"readonly"` }
Root contains information about the container's root filesystem on the host.
type Seccomp ¶
type Seccomp struct { DefaultAction Action `json:"defaultAction"` Architectures []Arch `json:"architectures"` Syscalls []Syscall `json:"syscalls,omitempty"` }
Seccomp represents syscall restrictions
type Spec ¶
type Spec struct { // Version is the version of the specification that is supported. Version string `json:"ociVersion"` // Platform is the host information for OS and Arch. Platform Platform `json:"platform"` // Process is the container's main process. Process Process `json:"process"` // Root is the root information for the container's filesystem. Root Root `json:"root"` // Hostname is the container's host name. Hostname string `json:"hostname,omitempty"` // Mounts profile configuration for adding mounts to the container's filesystem. Mounts []Mount `json:"mounts"` // Hooks are the commands run at various lifecycle events of the container. Hooks Hooks `json:"hooks"` // Annotations is an unstructured key value map that may be set by external tools to store and retrieve arbitrary metadata. Annotations map[string]string `json:"annotations,omitempty"` // Linux is platform specific configuration for Linux based containers. Linux Linux `json:"linux" platform:"linux"` }
Spec is the base configuration for the container. It specifies platform independent configuration. This information must be included when the bundle is packaged for distribution.
type State ¶
type State struct { // Version is the version of the specification that is supported. Version string `json:"version"` // ID is the container ID ID string `json:"id"` // Pid is the process id for the container's main process. Pid int `json:"pid"` // BundlePath is the path to the container's bundle directory. BundlePath string `json:"bundlePath"` }
State holds information about the runtime state of the container.
type Syscall ¶
type Syscall struct { Name string `json:"name"` Action Action `json:"action"` Args []Arg `json:"args,omitempty"` }
Syscall is used to match a syscall in Seccomp
type ThrottleDevice ¶
type ThrottleDevice struct { // Rate is the IO rate limit per cgroup per device Rate *uint64 `json:"rate,omitempty"` // contains filtered or unexported fields }
ThrottleDevice struct holds a `major:minor rate_per_second` pair
type User ¶
type User struct { // UID is the user id. (this field is platform dependent) UID uint32 `json:"uid,omitempty" platform:"linux"` // GID is the group id. (this field is platform dependent) GID uint32 `json:"gid,omitempty" platform:"linux"` // AdditionalGids are additional group ids set for the container's process. (this field is platform dependent) AdditionalGids []uint32 `json:"additionalGids,omitempty" platform:"linux"` }
User specifies Linux specific user and group information for the container's main process.
type WeightDevice ¶
type WeightDevice struct { // Weight is the bandwidth rate for the device, range is from 10 to 1000 Weight *uint16 `json:"weight,omitempty"` // LeafWeight is the bandwidth rate for the device while competing with the cgroup's child cgroups, range is from 10 to 1000, CFQ scheduler only LeafWeight *uint16 `json:"leafWeight,omitempty"` // contains filtered or unexported fields }
WeightDevice struct holds a `major:minor weight` pair for blkioWeightDevice