ipvs

Documentation

Index

• Constants
• func GetRequiredIPVSModules(kernelVersion *version.Version) []string
• func IsRsGracefulTerminationNeeded(proto string) bool
• type Interface
  • func New(exec utilexec.Interface) Interface
• type Protocol
• type RealServer
  • func (rs *RealServer) Equal(other *RealServer) bool
  • func (rs *RealServer) String() string
• type ServiceFlags
• type VirtualServer
  • func (svc *VirtualServer) Equal(other *VirtualServer) bool
  • func (svc *VirtualServer) String() string

Constants

const (
	// FlagPersistent specify IPVS service session affinity
	FlagPersistent = 0x1
	// FlagHashed specify IPVS service hash flag
	FlagHashed = 0x2
)

const (
	// KernelModuleIPVS is the kernel module "ip_vs"
	KernelModuleIPVS string = "ip_vs"
	// KernelModuleIPVSRR is the kernel module "ip_vs_rr"
	KernelModuleIPVSRR string = "ip_vs_rr"
	// KernelModuleIPVSWRR is the kernel module "ip_vs_wrr"
	KernelModuleIPVSWRR string = "ip_vs_wrr"
	// KernelModuleIPVSSH is the kernel module "ip_vs_sh"
	KernelModuleIPVSSH string = "ip_vs_sh"
	// KernelModuleNfConntrackIPV4 is the module "nf_conntrack_ipv4"
	KernelModuleNfConntrackIPV4 string = "nf_conntrack_ipv4"
	// KernelModuleNfConntrack is the kernel module "nf_conntrack"
	KernelModuleNfConntrack string = "nf_conntrack"
)

IPVS required kernel modules.

Functions

func GetRequiredIPVSModules

func GetRequiredIPVSModules(kernelVersion *version.Version) []string

GetRequiredIPVSModules returns the required ipvs modules for the given linux kernel version.

func IsRsGracefulTerminationNeeded

func IsRsGracefulTerminationNeeded(proto string) bool

IsRsGracefulTerminationNeeded returns true if protocol requires graceful termination for the stale connections

Types

type Interface

type Interface interface {
	// Flush clears all virtual servers in system. return occurred error immediately.
	Flush() error
	// AddVirtualServer creates the specified virtual server.
	AddVirtualServer(*VirtualServer) error
	// UpdateVirtualServer updates an already existing virtual server.  If the virtual server does not exist, return error.
	UpdateVirtualServer(*VirtualServer) error
	// DeleteVirtualServer deletes the specified virtual server.  If the virtual server does not exist, return error.
	DeleteVirtualServer(*VirtualServer) error
	// Given a partial virtual server, GetVirtualServer will return the specified virtual server information in the system.
	GetVirtualServer(*VirtualServer) (*VirtualServer, error)
	// GetVirtualServers lists all virtual servers in the system.
	GetVirtualServers() ([]*VirtualServer, error)
	// AddRealServer creates the specified real server for the specified virtual server.
	AddRealServer(*VirtualServer, *RealServer) error
	// GetRealServers returns all real servers for the specified virtual server.
	GetRealServers(*VirtualServer) ([]*RealServer, error)
	// DeleteRealServer deletes the specified real server from the specified virtual server.
	DeleteRealServer(*VirtualServer, *RealServer) error
	// UpdateRealServer updates the specified real server from the specified virtual server.
	UpdateRealServer(*VirtualServer, *RealServer) error
	// ConfigureTimeouts is the equivalent to running "ipvsadm --set" to configure tcp, tcpfin and udp timeouts
	ConfigureTimeouts(time.Duration, time.Duration, time.Duration) error
}

Interface is an injectable interface for running ipvs commands. Implementations must be goroutine-safe.

func New

func New(exec utilexec.Interface) Interface

New returns a new Interface which will call ipvs APIs.

type Protocol

type Protocol uint16

Protocol is the IPVS service protocol type

type RealServer

type RealServer struct {
	Address      net.IP
	Port         uint16
	Weight       int
	ActiveConn   int
	InactiveConn int
}

RealServer is an user-oriented definition of an IPVS real server in its entirety.

func (*RealServer) Equal

func (rs *RealServer) Equal(other *RealServer) bool

Equal check the equality of real server. We don't use struct == since it doesn't work because of slice.

func (*RealServer) String

func (rs *RealServer) String() string

type ServiceFlags

type ServiceFlags uint32

ServiceFlags is used to specify session affinity, ip hash etc.

type VirtualServer

type VirtualServer struct {
	Address   net.IP
	Protocol  string
	Port      uint16
	Scheduler string
	Flags     ServiceFlags
	Timeout   uint32
}

VirtualServer is an user-oriented definition of an IPVS virtual server in its entirety.

func (*VirtualServer) Equal

func (svc *VirtualServer) Equal(other *VirtualServer) bool

Equal check the equality of virtual server. We don't use struct == since it doesn't work because of slice.

func (*VirtualServer) String

func (svc *VirtualServer) String() string