Flannel is a Container Network Interface (CNI) plug-in that you can use to create a virtual network for containers based on Virtual Private Cloud (VPC). You can use Flannel to enable internal communication in a Kubernetes cluster. This topic describes the release notes for Flannel.
Overview
The Flannel network plug-in provided by Container Service for Kubernetes (ACK) allocates the pod CIDR block, which is independent of the VPC CIDR block. In an ACK cluster, Flannel works with the VPC in which the cluster is deployed. Packets are forwarded based on the VPC route table. This improves communication efficiency because no tunneling technologies such as Virtual extensible LAN (VXLAN) are required to encapsulate the packets. For more information, see Network overview.
Usage notes
Flannel is a simple and stable open source CNI plug-in. You can use Flannel with VPC. This allows your clusters and containers to run in high-performance and stable networks. For more information, see flannel.
Release notes
May 2024
Version | Image address | Release date | Description | Impact |
v0.15.1.23-33d25c1-aliyun | registry-cn-hangzhou.ack.aliyuncs.com/acs/flannel:v0.15.1.23-33d25c1-aliyun | May 20, 2024 | The compatibility of Flannel in Windows is improved. | ACK clusters that run Kubernetes 1.26 and later use Flannel of the updated version. ACK clusters that run Kubernetes earlier than 1.26 use Flannel of v0.15.1.22-20a397e6-aliyun. |
December 2022
Version | Image address | Release date | Description | Impact |
v0.15.1.22-20a397e6-aliyun | registry.cn-hangzhou.aliyuncs.com/acs/flannel:v0.15.1.22-20a397e6-aliyun | December 6, 2022 | The update policy is changed from OnDelete to RollingUpdate. | After you update Flannel to this version, if you manually modify the YAML file of Flannel, the modifications are automatically applied to all Flannel pods in the cluster by performing a rolling update on the pods. You do not need to delete Flannel pods to trigger the recreation of Flannel pods. For more information about the update policy, see DaemonSet Update Strategy. |
October 2022
Version | Image address | Release date | Description | Impact |
v0.15.1.19-d460293f-aliyun | registry.cn-hangzhou.aliyuncs.com/acs/flannel:v0.15.1.19-d460293f-aliyun | October 27, 2022 |
| No impact on workloads. |
September 2022
Version | Image address | Release date | Description | Impact |
v0.15.1.18-6f371e73-aliyun | registry.cn-hangzhou.aliyuncs.com/acs/flannel:v0.15.1.18-6f371e73-aliyun | September 26, 2022 | By default, Node Informer is disabled to improve performance. | No impact on workloads. |
August 2022
Version | Image address | Release date | Description | Impact |
v0.15.1.13-941db231-aliyun | registry.cn-hangzhou.aliyuncs.com/acs/flannel:v0.15.1.13-941db231-aliyun | August 29, 2022 | The CVE-2022-37434 vulnerability is fixed. | No impact on workloads. |
July 2022
Version | Image address | Release date | Description | Impact |
v0.15.1.11-7e95fe23-aliyun | registry.cn-hangzhou.aliyuncs.com/acs/flannel:v0.15.1.11-7e95fe23-aliyun | July 28, 2022 | /var/run is used as the default directory to cache IP addresses. This prevents IP leaks caused by server restarts. | No impact on workloads. |
May 2022
Version | Image address | Release date | Description | Impact |
v0.15.1.8-1634a106-aliyun | registry.cn-hangzhou.aliyuncs.com/acs/flannel:v0.15.1.8-1634a106-aliyun | May 10, 2022 | The CVE-2022-28391 vulnerability is fixed. | No impact on workloads. |
April 2022
Version | Image address | Release date | Description | Impact |
v0.15.1.6-a320565c-aliyun | registry.cn-hangzhou.aliyuncs.com/acs/flannel:v0.15.1.6-a320565c-aliyun | April 8, 2022 | An init container that is used to install Flannel is added. | No impact on workloads. |
January 2022
Version | Image address | Release date | Description | Impact |
v0.15.1.5-11d1c700-aliyun | registry.cn-hangzhou.aliyuncs.com/acs/flannel:v0.15.1.5-11d1c700-aliyun | January 25, 2022 | Instances that use the ARM64 architecture are supported. | No impact on workloads. |
December 2021
Version | Image address | Release date | Description | Impact |
v0.15.1.4-e02c8f12-aliyun | registry.cn-hangzhou.aliyuncs.com/acs/flannel:v0.15.1.4-e02c8f12-aliyun | December 1, 2021 |
| No impact on workloads. |
May 2021
Version | Image address | Release date | Description | Impact |
v0.13.0.1-466064b-aliyun | registry.cn-hangzhou.aliyuncs.com/acs/flannel:v0.13.0.1-466064b-aliyun | May 24, 2021 |
| No impact on workloads. |
August 2019
Version | Image address | Release date | Description | Impact |
v0.11.0.2-g6e46593e-aliyun | registry.cn-hangzhou.aliyuncs.com/acs/flannel:v0.11.0.2-g6e46593e-aliyun | August 2, 2019 | The issue that source IP addresses are not retained after Flannel is updated is fixed. | No impact on workloads. |