Hi Shuicheng

 

We specifically wanted to understand whether “Openstack Services” like Nova, Neutron etc are working in Active/Active or Active/StandBy.

In the “sm-dump”, there are “vim-services” mentioned, but there is no information about the state of individual “Neutron“ services and all other.

 

controller-0:/home/sysadmin# sm-dump   -Service_Groups------------------------------------------------------------------------ oam-services                     standby              standby controller-services              standby              standby cloud-services                   standby              standby patching-services                standby              standby directory-services               active               active web-services                     active               active storage-services                 active               active storage-monitoring-services      standby              standby vim-services                     standby              standby ---------------------------------------------------------------------------------------   -Services------------------------------------------------------------------------------ oam-ip                           enabled-standby      disabled management-ip                    enabled-standby      disabled drbd-pg                          enabled-standby      enabled-standby drbd-rabbit                      enabled-standby      enabled-standby drbd-cgcs                        enabled-standby      enabled-standby drbd-platform                    enabled-standby      enabled-standby pg-fs                            enabled-standby      disabled rabbit-fs                        enabled-standby      disabled nfs-mgmt                         enabled-standby      disabled cgcs-fs                          enabled-standby      disabled platform-fs                      enabled-standby      disabled postgres                         enabled-standby      disabled rabbit                           enabled-standby      disabled cgcs-export-fs                   enabled-standby      disabled platform-export-fs               enabled-standby      disabled cgcs-nfs-ip                      enabled-standby      disabled platform-nfs-ip                  enabled-standby      disabled sysinv-inv                       enabled-standby      disabled sysinv-conductor                 enabled-standby      disabled mtc-agent                        enabled-standby      disabled hw-mon                           enabled-standby      disabled dnsmasq                          enabled-standby      disabled fm-mgr                           enabled-standby      disabled keystone                         enabled-standby      disabled open-ldap                        enabled-active       enabled-active snmp                             enabled-standby      disabled lighttpd                         enabled-active       enabled-active horizon                          enabled-active       enabled-active patch-alarm-manager              enabled-standby      disabled mgr-restful-plugin               enabled-active       enabled-active ceph-manager                     enabled-standby      disabled vim                              enabled-standby      disabled vim-api                          enabled-standby      disabled vim-webserver                    enabled-standby      disabled guest-agent                      enabled-standby      disabled haproxy                          enabled-standby      disabled pxeboot-ip                       enabled-standby      disabled drbd-extension                   enabled-standby      enabled-standby extension-fs                     enabled-standby      disabled extension-export-fs              enabled-standby      disabled etcd                             enabled-standby      disabled drbd-etcd                        enabled-standby      enabled-standby etcd-fs                          enabled-standby      disabled barbican-api                     enabled-standby      disabled barbican-keystone-listener       enabled-standby      disabled barbican-worker                  enabled-standby      disabled cluster-host-ip                  enabled-standby      disabled docker-distribution              enabled-standby      disabled dockerdistribution-fs            enabled-standby      disabled drbd-dockerdistribution          enabled-standby      enabled-standby ceph-mon                         enabled-standby      disabled cephmon-fs                       enabled-standby      disabled drbd-cephmon                     enabled-standby      enabled-standby ceph-osd                         enabled-active       enabled-active helmrepository-fs                enabled-standby      disabled registry-token-server            enabled-standby      disabled dbmon                            enabled-standby      enabled-standby ------------------------------------------------------------------------------

 

 

In order to verify it, we captured “neutron-server” logs of both the StarlingX servers.

 

Case 1: Horizon is accessed using Floating Ip and One VM is spawned

 

It goes on Active Controller and “neutron-server” logs of Active Controller shows the creation of network port and assigning port to the VM.

 

Case 2: Horizon is accessed using Floating Ip and Two VM’s are spawned simultaneously

 

In this case, one VM gets spawned on Active Controller and Other on Standby Controller.

But “neutron-server” logs of both the controller shows the creation of network port and assigning port to the VM.

 

Inference:

As per our understanding, if all the “Openstack Services” were configured in Active/Standby, then request would have come to only Active Controller.

But, in this case both the Controllers are serving the request which implies that all the Openstack Services are configured in “Active/Active” State

 

Is our understanding correct that the StarlingX Nodes are in Active-Standby configuration, but all the Openstack Services are configured in Active-Active State?

 

Regards

Anirudh Gupta

 

 

 

Hi Anirudh,

What is the purpose or benefit you want to have 2 active controller?

I think it is reasonable there is 1 active controller only, and another controller is standby for backup, this is the meaning of HA.

Two active controller at the same time will cause brain split.

What do you mean “Openstack Services”? Openstack is containerized now, and run in both nodes by K8S.

 

 

 

Hi Shuicheng,

 

All the services on the Active Controller are “enabled-active” and I can see some services “enabled-standby” on the standby controller.

 

Is there any way we can set all the Openstack Services “enabled-active” on both the Active and Standby Node?

 

Regards

Anirudh Gupta

 

 

Hi Anirudh,

Per my understanding, for duplex, there is always 1 active node and 1 standby node.

The “active/active” or “active/standby” in the document is for “services”, not for node.

If you try to run “sudo sm-dump” in the standby node, you will find some services are “active”, while some services are “standby”.

 

For the 2^nd question, VMs are running in compute node. And for duplex, both controller nodes are compute nodes also.

And the “Active/Standby” is for controller, not for compute function, that is why VMs will run in both node.

 

 

 

Hi Team,

 

Can someone please give me any update on my Query:

 

I need to install StarlingX 2.0 Duplex Bare Metal.

As per the document, there can be 2 modes in which HA controllers can be configure i.e. either “active/active” or “active/standby”
https://docs.starlingx.io/deploy_install_guides/r2_release/bare_metal/aio_duplex.html

 

• Can someone please suggest the steps to configure Active-Active state?
• I have 2 kubernetes pods corresponding to each Openstack Service in Duplex Setup and when I spawn any VM, it goes on any of the two controllers. So, is this the standard implementation in StarlingX? What needs to be done in Active-Standby configuration?
• And, what difference it would have on my deployment in terms of functionality?

 

Regards

Anirudh Gupta

 

 

 

Hi Team,

 

I need to install StarlingX 2.0 Duplex Bare Metal.

As per the document, there can be 2 modes in which HA controllers can be configure i.e. either “active/active” or “active/standby”
https://docs.starlingx.io/deploy_install_guides/r2_release/bare_metal/aio_duplex.html

 

Can someone please suggest the steps to configure Active-Active state?

And, what difference it would have on my deployment in terms of functionality?

 

 

Regards

Anirudh Gupta

 

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