Poseidon is a proprietary container NetworkPolicy plugin developed by ACK. It supports the standard Kubernetes NetworkPolicy feature.
Component overview
Usage
To learn how to use NetworkPolicy in ACK Serverless clusters, see Use network policies.
Limitations
The NetworkPolicy feature is available only in ACK Serverless clusters, on ECI instances in ACK clusters, and on ACS CPU instances. This feature supports only IPv4, not IPv6.
The TrafficPolicy feature is available only on ACS instances in ACK clusters and in ACS clusters. This feature supports only IPv4, not IPv6.
The ACK GlobalNetworkPolicy feature is available only on ECS instances in ACK clusters. To use this feature, the cluster must use the Terway network plugin and have the NetworkPolicy feature enabled.
Changelog
March 2026
Version | Release date | Changes | Impact |
v0.7.0 | March 26, 2026 | Added support for the This feature is in a phased rollout. | This upgrade does not impact existing services. |
July 2024
Version | Release date | Changes | Impact |
v0.5.2 | July 29, 2024 | Fixed a compatibility issue with | This upgrade does not impact existing services. |
v0.5.1 | July 09, 2024 | Fixed an issue where the | This upgrade does not impact existing services. |
v0.5.0 | July 01, 2024 | Added support for | This upgrade does not impact existing services. |
September 2023
Version | Release date | Changes | Impact |
v0.3.0 | September 08, 2023 |
| This upgrade does not impact existing services. |
July 2023
Version | Release date | Changes | Impact |
v0.1.0 | July 06, 2023 | Added support for the | This upgrade does not impact existing services. |