ZStack Cloud provides two session persistence mechanisms: TCP/UDP-based 4th-layer session persistence and HTTP/HTTPS-based 7th-layer session persistence.

• 4th-layer session persistence:
  • Use Source IP Hash algorithm to direct requests from clients of the same source IP address to a backend server.
• 7th-layer session persistence:
  • When using Round Robin or Weighted Round Robin algorithm, a load balancer inserts or rewrites a cookie to direct requests to the backend server previously responded.
  • When using Source IP Hash algorithm, a load balancer uses the Hash function to direct requests from clients of the same source IP address to a backend server.

In earlier versions, the DHCP service only supports randomly assigning IP addresses. Starting from ZStack Cloud 4.6.0, when creating IPv4-typed L3 networks, you can specify IP Allocation Policy after the DHCP service is enabled. IP addresses can be assigned according to the following three allocation policies: Random, Allocate in Order, and Allocate in Cycle. After being specified, ZStack Cloud assigns IP addresses to resources in the Cloud that use this L3 network according to the specified allocation policy.

Also, you can enter the details page of the L3 network to modify the IP allocation policy to suit your business needs.

ZStack Cloud 4.6.0 begins to support enabling/disabling VM NICs of the vNIC type on the UI interface. ZStack Cloud saves all existing configurations of the NIC when disabling it. This way, when enabling the NIC, you can use the previous configurations to ensure the business configuration consistency, which improves the O&M efficiency.