Updated on 2023-12-07 GMT+08:00

Configuring Cluster Security Group Rules

CCE is a universal container platform. Its default security group rules apply to common scenarios. When a cluster is created, a security group is automatically created for the master node and worker node, separately. The security group name of the master node is {Cluster name}-cce-control-{Random ID}, and the security group name of the worker node is {Cluster name}-cce-node-{Random ID}. If a CCE Turbo cluster is used, an additional ENI security group named {Cluster name}-cce-eni-{Random ID} will be created.

You can log in to the management console, choose Service List > Networking > Virtual Private Cloud > Access Control > Security Groups, locate the security group of the cluster, and modify the security group rules as required.

The default security group rules of the clusters using different networks are as follows:

Modifying or deleting rules in a security group may affect cluster running. Exercise caution when performing this operation. If you need to modify security group rules, do not modify the rules of the port on which CCE running depends.

Security Group Rules of a Cluster Using a VPC Network

Security group of a worker node

A security group named {Cluster name}-cce-node-{Random ID} is automatically created for each worker node. For details about the default ports, see Table 1.

Table 1 Default ports in the security group for a worker node that uses a VPC network

Direction

Port

Default Source Address

Description

Modifiable

Modification Suggestion

Inbound rules

All UDP ports

VPC CIDR block

Allow access between worker nodes and between worker nodes and the master node.

No

N/A

All TCP ports

All ICMP ports

Security group of the master node

Allow the master node to access worker nodes.

No

N/A

TCP port range: 30000 to 32767

All IP addresses: 0.0.0.0/0

Allow access from NodePort.

Yes

Allow access from VPC, container, and ELB CIDR blocks.

UDP port range: 30000 to 32767

All ports

Container CIDR block

Allow access between nodes and containers.

No

N/A

All ports

Security group of worker nodes

Allow access between worker nodes.

No

N/A

TCP port 22

All IP addresses: 0.0.0.0/0

Allow SSH access to ECSs.

Recommended

N/A

Outbound rule

All ports

All IP addresses: 0.0.0.0/0

Allow traffic on all ports by default. You are advised to retain this setting.

Yes

If you want to harden security by allowing traffic only on specific ports, remember to allow such ports. For details, see Hardening Outbound Rules.

Security group of the master node

A security group named {Cluster name}-cce-control-{Random ID} is automatically created for the master node. For details about the default ports, see Table 2.

Table 2 Default ports in the security group for the master node that uses a VPC network

Direction

Port

Default Source Address

Description

Modifiable

Modification Suggestion

Inbound rules

TCP port 5444

VPC CIDR block

Allow access from kube-apiserver, which provides lifecycle management for Kubernetes resources.

No

N/A

TCP port 5444

Container CIDR block

TCP port 9443

VPC CIDR block

Allow the network add-on of a worker node to access the master node.

No

N/A

TCP port 5443

All IP addresses: 0.0.0.0/0

Allow kube-apiserver of the master node to listen to worker nodes.

Recommended

The port must allow traffic from the CIDR blocks of the VPC, container, and the control plane of the hosted service mesh.

TCP port 8445

VPC CIDR block

Allow the storage add-on of a worker node to access the master node.

No

N/A

All ports

IP addresses of this security group

Allow traffic from all IP addresses of this security group.

No

N/A

Outbound rule

All ports

All IP addresses: 0.0.0.0/0

Allow traffic on all ports by default.

No

N/A

Security Group Rules of a Cluster Using the Tunnel Network

Security group of a worker node

A security group named {Cluster name}-cce-node-{Random ID} is automatically created for each worker node. For details about the default ports, see Table 3.

Table 3 Default ports in the security group for a worker node that uses the tunnel network

Direction

Port

Default Source Address

Description

Modifiable

Modification Suggestion

Inbound rules

UDP port 4789

All IP addresses: 0.0.0.0/0

Allow access between containers.

No

N/A

TCP port 10250

CIDR block of the master node

Allow the master node to access kubelet on a worker node, for example, by running kubectl exec {pod}.

No

N/A

TCP port range: 30000 to 32767

All IP addresses: 0.0.0.0/0

Allow access from NodePort.

Yes

Allow access from VPC, container, and ELB CIDR blocks.

UDP port range: 30000 to 32767

TCP port 22

All IP addresses: 0.0.0.0/0

Allow SSH access to ECSs.

Recommended

N/A

All ports

IP addresses of this security group

Allow traffic from all IP addresses of this security group.

No

N/A

Outbound rule

All ports

All IP addresses: 0.0.0.0/0

Allow traffic on all ports by default. You are advised to retain this setting.

Yes

If you want to harden security by allowing traffic only on specific ports, remember to allow such ports. For details, see Hardening Outbound Rules.

Security group of the master node

A security group named {Cluster name}-cce-control-{Random ID} is automatically created for the master node. For details about the default ports, see Table 4.

Table 4 Default ports in the security group for the master node that uses the Tunnel network

Direction

Port

Default Source Address

Description

Modifiable

Modification Suggestion

Inbound rules

UDP port 4789

All IP addresses: 0.0.0.0/0

Allow access between containers.

No

N/A

TCP port 5444

VPC CIDR block

Allow access from kube-apiserver, which provides lifecycle management for Kubernetes resources.

No

N/A

TCP port 5444

Container CIDR block

TCP port 9443

VPC CIDR block

Allow the network add-on of a worker node to access the master node.

No

N/A

TCP port 5443

All IP addresses: 0.0.0.0/0

Allow kube-apiserver of the master node to listen to worker nodes.

Recommended

The port must allow traffic from the CIDR blocks of the VPC, container, and the control plane of the hosted service mesh.

TCP port 8445

VPC CIDR block

Allow the storage add-on of a worker node to access the master node.

No

N/A

All ports

IP addresses of this security group

Allow traffic from all IP addresses of this security group.

No

N/A

Outbound rule

All ports

All IP addresses: 0.0.0.0/0

Allow traffic on all ports by default.

No

N/A

Security Group Rules of a CCE Turbo Cluster Using the Cloud Native Network 2.0

Security group of a worker node

A security group named {Cluster name}-cce-node-{Random ID} is automatically created for each worker node. For details about the default ports, see Table 5.

Table 5 Default ports in the security group for a worker node

Direction

Port

Default Source Address

Description

Modifiable

Modification Suggestion

Inbound rules

TCP port 10250

CIDR block of the master node

Allow the master node to access kubelet on a worker node, for example, by running kubectl exec {pod}.

No

N/A

TCP port range: 30000 to 32767

All IP addresses: 0.0.0.0/0

Allow access from NodePort.

Yes

Allow access from VPC, container, and ELB CIDR blocks.

UDP port range: 30000 to 32767

TCP port 22

All IP addresses: 0.0.0.0/0

Allow SSH access to ECSs.

Recommended

N/A

All ports

IP addresses of this security group

Allow traffic from all IP addresses of this security group.

No

N/A

All ports

Subnet CIDR block of the master node

Allow traffic from all source IP addresses in the subnet CIDR block of the master node.

No

N/A

Outbound rule

All ports

All IP addresses: 0.0.0.0/0

Allow traffic on all ports by default. You are advised to retain this setting.

Yes

If you want to harden security by allowing traffic only on specific ports, remember to allow such ports. For details, see Hardening Outbound Rules.

Security group of the master node

A security group named {Cluster name}-cce-control-{Random ID} is automatically created for the master node. For details about the default ports, see Table 6.

Table 6 Default ports in the security group for the master node

Direction

Port

Default Source Address

Description

Modifiable

Modification Suggestion

Inbound rules

TCP port 5444

All IP addresses: 0.0.0.0/0

Allow access from kube-apiserver, which provides lifecycle management for Kubernetes resources.

No

N/A

TCP port 5444

VPC CIDR block

No

N/A

TCP port 9443

VPC CIDR block

Allow the network add-on of a worker node to access the master node.

No

N/A

TCP port 5443

All IP addresses: 0.0.0.0/0

Allow kube-apiserver of the master node to listen to worker nodes.

Recommended

The port must allow traffic from the CIDR blocks of the VPC, container, and the control plane of the hosted service mesh.

TCP port 8445

VPC CIDR block

Allow the storage add-on of a worker node to access the master node.

No

N/A

All ports

IP addresses of this security group

Allow traffic from all IP addresses of this security group.

No

N/A

All ports

Subnet CIDR block of the master node

Allow traffic from all source IP addresses in the subnet CIDR block of the master node.

No

N/A

Outbound rule

All ports

All IP addresses: 0.0.0.0/0

Allow traffic on all ports by default.

No

N/A

Security group of an ENI

An additional security group named {Cluster name}-cce-eni-{Random ID} is created for a CCE Turbo cluster. For details about the default ports, see Table 7.

Table 7 Default ports in the security group for an ENI

Direction

Port

Default Source Address

Description

Modifiable

Modification Suggestion

Inbound rules

All ports

IP addresses of this security group

Allow traffic from all IP addresses of this security group.

No

N/A

VPC CIDR block

Allow traffic from all IP addresses of the VPC CIDR block.

No

N/A

Outbound rule

All ports

All IP addresses: 0.0.0.0/0

Allow traffic on all ports by default.

No

N/A

Hardening Outbound Rules

By default, all security groups created by CCE allow all the outbound traffic. You are advised to retain this configuration. If you want to harden security by allowing traffic only on specific ports, remember to allow ports listed in the following table.

Table 8 Ports that must be allowed in outbound rules for a worker node

Port

Allowed CIDR

Description

UDP port 53

DNS server of the subnet

Allow traffic on the port for domain name resolution.

UDP port 4789 (required only for clusters that use the Tunnel network)

All IP addresses

Allow access between containers.

TCP port 5443

CIDR block of the master node

Allow kube-apiserver of the master node to listen to worker nodes.

TCP port 5444

CIDR blocks of the VPC and container

Allow access from kube-apiserver, which provides lifecycle management for Kubernetes resources.

TCP port 6443

CIDR block of the master node

None

TCP port 8445

VPC CIDR block

Allow the storage add-on of a worker node to access the master node.

TCP port 9443

VPC CIDR block

Allow the network add-on of a worker node to access the master node.