diff --git a/cmd/runj/create.go b/cmd/runj/create.go
index 121b4b5..9c3fca4 100644
--- a/cmd/runj/create.go
+++ b/cmd/runj/create.go
@@ -137,6 +137,16 @@ the console's pseudoterminal`)
 		if err := jail.CreateJail(cmd.Context(), confPath); err != nil {
 			return err
 		}
+		err = jail.Limit(id, ociConfig)
+		if err != nil {
+			return err
+		}
+		defer func() {
+			if err == nil {
+				return
+			}
+			jail.Unlimit(id, ociConfig)
+		}()
 		err = jail.Mount(ociConfig)
 		if err != nil {
 			return err
diff --git a/cmd/runj/delete.go b/cmd/runj/delete.go
index 23ba2f8..37bc134 100644
--- a/cmd/runj/delete.go
+++ b/cmd/runj/delete.go
@@ -59,6 +59,10 @@ func deleteCommand() *cobra.Command {
 			if ociConfig == nil {
 				return errors.New("OCI config is required")
 			}
+			err = jail.Unlimit(id, ociConfig)
+			if err != nil {
+				return err
+			}
 			err = jail.Unmount(ociConfig)
 			if err != nil {
 				return err
diff --git a/jail/limit.go b/jail/limit.go
new file mode 100644
index 0000000..e67454e
--- /dev/null
+++ b/jail/limit.go
@@ -0,0 +1,123 @@
+package jail
+
+import (
+	"fmt"
+	"os/exec"
+
+	"go.sbk.wtf/runj/runtimespec"
+)
+
+// Limit uses rctl to add the rct rules
+func Limit(id string, ociConfig *runtimespec.Spec) error {
+	if ociConfig.FreeBSD == nil {
+		return nil
+	}
+	for _, rule := range makeRCTLRules(id, ociConfig.FreeBSD.Resources) {
+		cmd := exec.Command("rctl", "-a", rule)
+		err := cmd.Run()
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// Unlimit uses rctl to remove the rctl rules
+func Unlimit(id string, ociConfig *runtimespec.Spec) error {
+	if ociConfig.FreeBSD == nil {
+		return nil
+	}
+	for _, rule := range makeRCTLRules(id, ociConfig.FreeBSD.Resources) {
+		cmd := exec.Command("rctl", "-r", rule)
+		err := cmd.Run()
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func makeRCTLMemoryRules(id string, memory *runtimespec.FreeBSDMemory) []string {
+	var rules []string
+	if memory.Limit != nil {
+		rules = append(rules, formatRCTLRule(id, "memoryuse", "deny", *memory.Limit))
+	}
+	if memory.Warning != nil {
+		rules = append(rules, formatRCTLRule(id, "memoryuse", "devctl", *memory.Warning))
+	}
+	if memory.Swap != nil {
+		rules = append(rules, formatRCTLRule(id, "swapuse", "deny", *memory.Swap))
+	}
+	if memory.SwapWarning != nil {
+		rules = append(rules, formatRCTLRule(id, "swapuse", "devctl", *memory.SwapWarning))
+	}
+	return rules
+}
+
+func makeRCTLFSIORules(id string, fsio *runtimespec.FreeBSDFSIO) []string {
+	var rules []string
+	if fsio.ReadBPS != nil {
+		rules = append(rules, formatRCTLRule(id, "readbps", "throttle", *fsio.ReadBPS))
+	}
+	if fsio.WriteBPS != nil {
+		rules = append(rules, formatRCTLRule(id, "writebps", "throttle", *fsio.WriteBPS))
+	}
+	if fsio.ReadIOPS != nil {
+		rules = append(rules, formatRCTLRule(id, "readiops", "throttle", *fsio.ReadIOPS))
+	}
+	if fsio.WriteIOPS != nil {
+		rules = append(rules, formatRCTLRule(id, "writeiops", "throttle", *fsio.WriteIOPS))
+	}
+	return rules
+}
+
+func makeRCTLShmRules(id string, shm *runtimespec.FreeBSDShm) []string {
+	var rules []string
+	if shm.Count != nil {
+		rules = append(rules, formatRCTLRule(id, "nshm", "deny", *shm.Count))
+	}
+	if shm.Size != nil {
+		rules = append(rules, formatRCTLRule(id, "shmsize", "deny", *shm.Size))
+	}
+	return rules
+}
+
+func makeRCTLCPURules(id string, cpu *runtimespec.FreeBSDCPU) []string {
+	var rules []string
+	if cpu.Limit != nil {
+		rules = append(rules, formatRCTLRule(id, "pcpu", "deny", *cpu.Limit))
+	}
+	return rules
+}
+
+func makeRCTLProcessRules(id string, proc *runtimespec.FreeBSDProcess) []string {
+	var rules []string
+	if proc.Limit != nil {
+		rules = append(rules, formatRCTLRule(id, "maxproc", "deny", *proc.Limit))
+	}
+	return rules
+}
+
+func makeRCTLRules(id string, resources *runtimespec.FreeBSDResources) []string {
+	var rules []string
+	if resources.Memory != nil {
+		rules = append(rules, makeRCTLMemoryRules(id, resources.Memory)...)
+	}
+	if resources.FSIO != nil {
+		rules = append(rules, makeRCTLFSIORules(id, resources.FSIO)...)
+	}
+	if resources.Shm != nil {
+		rules = append(rules, makeRCTLShmRules(id, resources.Shm)...)
+	}
+	if resources.CPU != nil {
+		rules = append(rules, makeRCTLCPURules(id, resources.CPU)...)
+	}
+	if resources.Process != nil {
+		rules = append(rules, makeRCTLProcessRules(id, resources.Process)...)
+	}
+	return rules
+}
+
+func formatRCTLRule(id string, resource string, action string, amount uint64) string {
+	return fmt.Sprintf("jail:%v:%v:%v=%v", id, resource, action, amount)
+}
diff --git a/runtimespec/config.go b/runtimespec/config.go
index 4166b59..de29bbb 100644
--- a/runtimespec/config.go
+++ b/runtimespec/config.go
@@ -53,6 +53,11 @@ type Spec struct {
 		VM *VM `json:"vm,omitempty" platform:"vm"`
 	*/
 	// End of modification
+
+	// Modification by Cyril Zhang
+	// FreeBSD is platform-specific configuration for FreeBSD based containers.
+	FreeBSD *FreeBSD `json:"freebsd,omitempty" platform:"freebsd"`
+	// End of modification
 }
 
 // Modification by Samuel Karp
@@ -135,6 +140,67 @@ type Mount struct {
 	Options []string `json:"options,omitempty"`
 }
 
+// Modification by Cyril Zhang
+// FreeBSD contains platform-specific configuration for FreeBSD based containers.
+type FreeBSD struct {
+	// Resources is resource limits for FreeBSD.
+	Resources *FreeBSDResources `json:"resources,omitempty"`
+}
+
+// FreeBSDResources contains a set of resource limits for FreeBSD.
+type FreeBSDResources struct {
+	// Memory is the memory restriction configuration.
+	Memory *FreeBSDMemory `json:"memory,omitempty"`
+	// FSIO is the filesystem IO restriction configuration.
+	FSIO *FreeBSDFSIO `json:"fsIO,omitempty"`
+	// Shm is the shared memory restriction configuration.
+	Shm *FreeBSDShm `json:"shm,omitempty"`
+	// CPU is the CPU restriction configuration.
+	CPU *FreeBSDCPU `json:"cpu,omitempty"`
+	// Process is the process restriction configuration.
+	Process *FreeBSDProcess `json:"process,omitempty"`
+}
+
+type FreeBSDMemory struct {
+	// Limit is the memory limit (in bytes).
+	Limit *uint64 `json:"limit,omitempty"`
+	// Warning is the amount of memory (in bytes) where a warning is sent to devd(8).
+	Warning *uint64 `json:"warning,omitempty"`
+	// Swap is the amount of swap that may be used (in bytes).
+	Swap *uint64 `json:"swap,omitempty"`
+	// SwapWarning is the amount of swap (in bytes) where a warning is sent to devd(8).
+	SwapWarning *uint64 `json:"swapWarning,omitempty"`
+}
+
+type FreeBSDFSIO struct {
+	// ReadBPS is the rate of filesystem reads (in bytes per second) before throttling occurs.
+	ReadBPS *uint64 `json:"readbps,omitempty"`
+	// WriteBPS is the rate of filesystem writes (in bytes per second) before throttling occurs.
+	WriteBPS *uint64 `json:"writebps,omitempty"`
+	// ReadIOPS is the rate of filesystem read (in operations per second) before throttling occurs.
+	ReadIOPS *uint64 `json:"readiops,omitempty"`
+	// WriteBPS is the rate of filesystem writes (in operations per second) before throttling occurs.
+	WriteIOPS *uint64 `json:"writeiops,omitempty"`
+}
+
+type FreeBSDShm struct {
+	// Count is the limit of shared memory object count.
+	Count *uint64 `json:"count,omitempty"`
+	// Size is the limit of total shared memory object size (in bytes).
+	Size *uint64 `json:"size,omitempty"`
+}
+
+type FreeBSDCPU struct {
+	// Limit is limit of CPU usage (in percent of a single CPU).
+	Limit *uint64 `json:"limit,omitempty"`
+}
+
+type FreeBSDProcess struct {
+	// Limit is the limit of process count.
+	Limit *uint64 `json:"limit,omitempty"`
+}
+// End of modification
+
 // Modification by Samuel Karp
 /*
 Omitted type definitions for: