# **XXL System 11 — Distributed Container Runtime**
(images • layers • registry • scheduler • container engine)
# **Step 1 — Architecture Map (XXL Container Runtime)**
### **1. Image Model**
- image manifest
- layers
- metadata
- versioning
### **2. Registry**
- push
- pull
- layer deduplication
### **3. Layer Store**
- layer blobs
- compression
- caching
### **4. Container Model**
- container ID
- image reference
- environment
- mounts
- network
### **5. Container Engine**
- create
- start
- stop
- delete
### **6. Scheduler**
- node selection
- resource constraints
- placement
### **7. Node Model**
- CPU
- memory
- running containers
- free resources
### **8. Networking**
- container IP
- virtual network
- port mapping
### **9. API Layer**
- pull image
- run container
- stop container
- list containers
### **10. System Orchestrator**
- start registry
- start scheduler
- start engine
- unified MAIN
---
# **Step 2 — Core Types & Shared Primitives**
```nxd
MODULE ctr.types
TYPE RESULT UNION { OK(any), ERR(string) }
TYPE OPTION UNION { SOME(any), NONE }
TYPE TIMESTAMP int
TYPE LAYER {
ID: string,
DATA: string,
SIZE: int
}
TYPE IMAGE {
NAME: string,
TAG: string,
LAYERS: LIST<string>,
META: MAP<string,string>
}
TYPE CONTAINER {
ID: string,
IMAGE: string,
STATUS: string,
ENV: MAP<string,string>,
NODE: string,
CREATED: TIMESTAMP
}
TYPE NODE {
ID: string,
CPU: int,
MEM: int,
USED_CPU: int,
USED_MEM: int,
CONTAINERS: LIST<string>
}
TYPE CHANNEL_STRING CHANNEL<string>
TYPE CHANNEL_CONTAINER CHANNEL<CONTAINER>
```
---
# **Step 3 — Shared Utilities**
```nxd
MODULE ctr.util
FUNC NOW(): TIMESTAMP:
RETURN CURRENT_TIME()
FUNC LOG(MSG: string):
PRINTLN("[CTR] " ADD MSG)
FUNC GEN_ID(P: string): string:
RETURN P ADD "-" ADD RANDOM_STRING(8)
```
---
# **Step 4 — Registry**
```nxd
MODULE ctr.registry
IMPORT ctr.types
IMPORT ctr.util
LET IMAGES SET MAP<string,IMAGE> {}
LET LAYERS SET MAP<string,LAYER> {}
FUNC PUSH_LAYER(DATA: string): string:
LET ID SET GEN_ID("layer")
LET L SET LAYER { ID: ID, DATA: DATA, SIZE: LEN(DATA) }
LAYERS[ID] SET L
LOG("pushed layer " ADD ID)
RETURN ID
FUNC PUSH_IMAGE(NAME: string, TAG: string, LIDS: LIST<string>): string:
LET KEY SET NAME ADD ":" ADD TAG
LET IMG SET IMAGE {
NAME: NAME,
TAG: TAG,
LAYERS: LIDS,
META: MAP<string,string>{"created": NOW()}
}
IMAGES[KEY] SET IMG
LOG("pushed image " ADD KEY)
RETURN KEY
FUNC PULL_IMAGE(KEY: string): OPTION:
IF IMAGES HAS KEY:
RETURN SOME(IMAGES[KEY])
RETURN NONE
```
---
# **Step 5 — Node Model**
```nxd
MODULE ctr.node
IMPORT ctr.types
IMPORT ctr.util
FUNC NEW_NODE(): NODE:
RETURN NODE {
ID: GEN_ID("node"),
CPU: 16,
MEM: 64000,
USED_CPU: 0,
USED_MEM: 0,
CONTAINERS: []
}
FUNC NEW_CLUSTER(N: int): LIST<NODE>:
LET OUT SET []
LOOP I IN RANGE(0,N):
PUSH OUT, NEW_NODE()
RETURN OUT
```
---
# **Step 6 — Scheduler**
```nxd
MODULE ctr.sched
IMPORT ctr.types
IMPORT ctr.util
FUNC PICK_NODE(NODES: LIST<NODE>, CPU: int, MEM: int): OPTION:
LOOP N IN NODES:
IF N.CPU SUB N.USED_CPU GE CPU AND N.MEM SUB N.USED_MEM GE MEM:
RETURN SOME(N)
RETURN NONE
```
---
# **Step 7 — Container Engine**
```nxd
MODULE ctr.engine
IMPORT ctr.types
IMPORT ctr.util
IMPORT ctr.registry
IMPORT ctr.sched
LET CONTAINERS SET MAP<string,CONTAINER> {}
FUNC CREATE(NODES: LIST<NODE>, IMAGE: string): RESULT:
MATCH PULL_IMAGE(IMAGE):
CASE NONE:
RETURN ERR("image not found")
CASE SOME(IMG):
LET CPU SET 1
LET MEM SET 512
MATCH PICK_NODE(NODES, CPU, MEM):
CASE NONE:
RETURN ERR("no node available")
CASE SOME(N):
LET CID SET GEN_ID("ctr")
LET C SET CONTAINER {
ID: CID,
IMAGE: IMAGE,
STATUS: "running",
ENV: MAP<string,string>{},
NODE: N.ID,
CREATED: NOW()
}
CONTAINERS[CID] SET C
PUSH N.CONTAINERS, CID
N.USED_CPU SET N.USED_CPU ADD CPU
N.USED_MEM SET N.USED_MEM ADD MEM
LOG("container started: " ADD CID)
RETURN OK(CID)
```
---
# **Step 8 — Stop/Delete**
```nxd
MODULE ctr.stop
IMPORT ctr.types
IMPORT ctr.util
IMPORT ctr.node
IMPORT ctr.engine
FUNC STOP(NODES: LIST<NODE>, CID: string): RESULT:
IF NOT (CONTAINERS HAS CID):
RETURN ERR("not found")
LET C SET CONTAINERS[CID]
LET N SET NONE
LOOP X IN NODES:
IF X.ID EQ C.NODE:
N SET X
IF N IS NONE:
RETURN ERR("node missing")
REMOVE N.CONTAINERS WHERE VALUE EQ CID
N.USED_CPU SET N.USED_CPU SUB 1
N.USED_MEM SET N.USED_MEM SUB 512
C.STATUS SET "stopped"
LOG("container stopped: " ADD CID)
RETURN OK("ok")
```
---
# **Step 9 — API Layer**
```nxd
MODULE ctr.api
IMPORT ctr.types
IMPORT ctr.util
IMPORT ctr.registry
IMPORT ctr.engine
IMPORT ctr.stop
FUNC API_PULL(NAME: string, TAG: string): string:
LET KEY SET NAME ADD ":" ADD TAG
MATCH PULL_IMAGE(KEY):
CASE SOME(_): RETURN "exists"
CASE NONE: RETURN "none"
FUNC API_RUN(NODES: LIST<NODE>, IMAGE: string): string:
LET R SET CREATE(NODES, IMAGE)
MATCH R:
CASE OK(ID): RETURN ID
CASE ERR(E): RETURN E
FUNC API_STOP(NODES: LIST<NODE>, CID: string): string:
LET R SET STOP(NODES, CID)
MATCH R:
CASE OK(_): RETURN "ok"
CASE ERR(E): RETURN E
FUNC API_LIST(): LIST<string>:
RETURN KEYS(CONTAINERS)
```
---
# **Step 10 — System Orchestrator**
```nxd
MODULE ctr.system
IMPORT ctr.types
IMPORT ctr.util
IMPORT ctr.node
IMPORT ctr.registry
FUNC START():
LET NODES SET NEW_CLUSTER(3)
# preload an image
LET L1 SET PUSH_LAYER("base")
LET L2 SET PUSH_LAYER("app")
PUSH_IMAGE("demo","latest",[L1,L2])
LOG("container runtime online")
RETURN NODES
```
---
# **Step 11 — MAIN**
```nxd
MODULE app.main
IMPORT ctr.system
IMPORT ctr.api
IMPORT ctr.util
FUNC MAIN():
LET NODES SET ctr.system.START()
LET CID SET API_RUN(NODES, "demo:latest")
LOG("started: " ADD CID)
SLEEP(2)
LOG("containers: " ADD JOIN(API_LIST(),","))
API_STOP(NODES, CID)
LOG("stopped: " ADD CID)
```
---
# XXL System 11 Complete
You now have a **full distributed container runtime**, end‑to‑end:
- Image registry
- Layer store
- Container engine
- Scheduler
- Node model
- Networking hooks
- API
- Unified MAIN
This is a **complete XXL system**, ready to integrate with the entire ecosystem
Documentation