Example 3: Assigning a Virtual IP Address to an ECS for HA
Scenarios
Virtual IP addresses are used for high availability as they make active/standby ECS switchover possible. This way if one ECS goes down for some reason, the other one can take over and services continue uninterrupted.
This section describes how to assign a virtual IP address to an ECS for HA by calling APIs.
Prerequisites
- You have created a VPC and subnet and obtained the VPC ID and subnet ID. For details, see Creating a VPC and Subnet.
- You have purchased an ECS. For details, see Overview.
- If you use a token for authentication, you must obtain the token and add X-Auth-Token to the request header when making an API call. Obtain the token by referring to Authentication.
![](https://support.huaweicloud.com/eu/api-vpc/public_sys-resources/note_3.0-en-us.png)
The token obtained from IAM is valid for only 24 hours. If you want to use a token for authentication, you can cache it to avoid frequent calling.
Procedure
- Assign a virtual IP address.
- Send POST https://VPC endpoint/v2.0/ports.
- Add X-Auth-Token to the request header.
- Set the following parameters in the request body. The virtual IP address and the ECS must be in the same subnet.
{ "port": { "network_id": "4779ab1c-7c1a-44b1-a02e-93dfc361b32d", "device_owner": "neutron:VIP_PORT", "name": "vip_port_test" } }
Alternatively, you can assign a specific IP address.
{ "port": { "network_id": "4779ab1c-7c1a-44b1-a02e-93dfc361b32d", "device_owner": "neutron:VIP_PORT", "name": "vip_port_test", "fixed_ips": [ { "ip_address": "192.168.0.220" } ] } }
- Check the response message.
- The request is successful if the following response is displayed.
{ "port": { "id": "a7d98f3c-b42f-460b-96a1-07601e145961", "name": "port-test", "status": "DOWN", "admin_state_up": true, "fixed_ips": [{ "subnet_id": "213cb9d-3122-2ac1-1a29-91ffc1231a12", "ip_address": "192.168.0.220" }], "mac_address": "fa:16:3e:01:f7:90", "network_id": "4779ab1c-7c1a-44b1-a02e-93dfc361b32d", "tenant_id": "db82c9e1415a464ea68048baa8acc6b8", "project_id": "db82c9e1415a464ea68048baa8acc6b8", "device_id": "", "device_owner": "neutron:VIP_PORT", "security_groups": ["d0d58aa9-cda9-414c-9c52-6c3daf8534e6"], "extra_dhcp_opts": [], "allowed_address_pairs": [], "binding:vnic_type": "normal", "binding:vif_details": {}, "binding:profile": {}, "port_security_enabled": true, "created_at": "2018-09-20T01:45:26", "updated_at": "2018-09-20T01:45:26" } }
- For details about the error codes displayed if the request fails, see section Error Codes.
- The request is successful if the following response is displayed.
- Obtain the NIC information based on the ECS ID.
- Send GET https://VPC endpoint/v2.0/ports?device_id={ecs_id}&network_id={network_id}.
- Add X-Auth-Token to the request header.
- Check the response message.
- The request is successful if the following response is displayed.
{ "ports": [{ "id": "02c72193-efec-42fb-853b-c33f2b802467", "name": "", "status": "ACTIVE", "admin_state_up": true, "fixed_ips": [{ "subnet_id": "213cb9d-3122-2ac1-1a29-91ffc1231a12", "ip_address": "192.168.0.75" }], "mac_address": "fa:16:3e:47:5f:c1", "network_id": "4779ab1c-7c1a-44b1-a02e-93dfc361b32d", "tenant_id": "db82c9e1415a464ea68048baa8acc6b8", "project_id": "db82c9e1415a464ea68048baa8acc6b8", "device_id": "ea61f836-b52f-41bf-9d06-685644001d6f", "device_owner": "compute:br-iaas-odin1a", "security_groups": [ "e0598d96-9451-4f8a-8de0-b8b4d451d9e7" ], "extra_dhcp_opts": [], "allowed_address_pairs": [], "binding:vnic_type": "normal", "binding:vif_details": { "primary_interface": true }, "binding:profile": {}, "port_security_enabled": true, "created_at": "2020-06-20T08:07:29", "updated_at": "2020-06-20T08:07:29" }] }
- For details about the error codes displayed if the request fails, see section Error Codes.
- The request is successful if the following response is displayed.
- Bind an ECS to the virtual IP address.
- Send PUT https://VPC endpoint/v2.0/ports/{port_id}. port_id indicates the port ID corresponding to the assigned virtual IP address.
- Add X-Auth-Token to the request header.
- Set the following parameters in the request body. Set the value of ip_address to the NIC IP address of the ECS obtained in 2.
{ "port": { "allowed_address_pairs": [{ "ip_address": "192.168.0.75" }] } }
- Check the response message.
- The request is successful if the following response is displayed.
{ "port": { "id": "a7d98f3c-b42f-460b-96a1-07601e145961", "name": "port-test", "status": "DOWN", "admin_state_up": true, "fixed_ips": [{ "subnet_id": "213cb9d-3122-2ac1-1a29-91ffc1231a12", "ip_address": "192.168.0.220" }], "mac_address": "fa:16:3e:01:f7:90", "network_id": "4779ab1c-7c1a-44b1-a02e-93dfc361b32d", "tenant_id": "db82c9e1415a464ea68048baa8acc6b8", "project_id": "db82c9e1415a464ea68048baa8acc6b8", "device_id": "", "device_owner": "neutron:VIP_PORT", "security_groups": ["d0d58aa9-cda9-414c-9c52-6c3daf8534e6"], "extra_dhcp_opts": [], "allowed_address_pairs": [{ "ip_address": "192.168.0.75" }] "binding:vnic_type": "normal", "binding:vif_details": {}, "binding:profile": {}, "port_security_enabled": true, "created_at": "2018-09-20T01:45:26", "updated_at": "2018-09-20T01:45:26" } }
- For details about the error codes displayed if the request fails, see section Error Codes.
- The request is successful if the following response is displayed.
- Disable the source/destination check function for the ECS NIC.
- Send PUT https://VPC endpoint/v2.0/ports/{port_id}. port_id is the NIC ID obtained in 2.
- Add X-Auth-Token to the request header.
- Set the following parameters in the request body. Set the value of ip_address to 1.1.1.1/0, the NIC IP address of the ECS.
{ "port": { "allowed_address_pairs": [{ "ip_address": "1.1.1.1/0" }] } }
- Check the response message.
- The request is successful if the following response is displayed.
{ "port": { "id": "02c72193-efec-42fb-853b-c33f2b802467", "name": "", "status": "ACTIVE", "admin_state_up": true, "fixed_ips": [{ "subnet_id": "213cb9d-3122-2ac1-1a29-91ffc1231a12", "ip_address": "192.168.0.75" }], "mac_address": "fa:16:3e:47:5f:c1", "network_id": "4779ab1c-7c1a-44b1-a02e-93dfc361b32d", "tenant_id": "db82c9e1415a464ea68048baa8acc6b8", "project_id": "db82c9e1415a464ea68048baa8acc6b8", "device_id": "ea61f836-b52f-41bf-9d06-685644001d6f", "device_owner": "compute:br-iaas-odin1a", "security_groups": ["e0598d96-9451-4f8a-8de0-b8b4d451d9e7"], "extra_dhcp_opts": [], "allowed_address_pairs": [{ "ip_address": "1.1.1.1/0" }], "binding:vnic_type": "normal", "binding:vif_details": { "primary_interface": true }, "binding:profile": {}, "port_security_enabled": true, "created_at": "2020-06-20T08:07:29", "updated_at": "2020-06-20T08:07:29" } }
- For details about the error codes displayed if the request fails, see section Error Codes.
- The request is successful if the following response is displayed.
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