How to use same Topology Manager DB from 2 CME?

Question

I installed 2 "SDL Web 8" in 2 servers("ServerA" and "ServerB").

And those 2 "SDL Web 8" are using same "Tridion CM" DB and "Topology Manager DB", because one of them is used only for publishing to improve publish performance.

When installing Web 8, I specified "Content Manager environment ID" as following.

• ServerA:"ServerAEnvironmentId"
• ServerB:"ServerBEnvironmentId"

And I modified "TtmCmEnvironment" by Topology Manager, and now "Get-TtmCmEnvironment" command returns following results.

CoreServiceRootUrl     : net.tcp://ServerA:2660
WebsiteRootUrl         : http://ServerA:80
CoreServiceCredentials : "AuthenticationType":"Windows", "UserName":"MTSUser", "Password":"********"
Id                     : ServerAEnvironmentId
ExtensionProperties    : {}

CoreServiceRootUrl     : net.tcp://ServerB:2660
WebsiteRootUrl         : http://ServerB:80
CoreServiceCredentials : "AuthenticationType":"Windows", "UserName":"MTSUser", "Password":"********"
Id                     : ServerBEnvironmentId
ExtensionProperties    : {}

When I try to remove Topology Type by "Remove-TtmCdTopologyType" command in ServerA, following error occurs.(This message is not exactly same because I translated it from Japanese.)

Failed to remove "CdTopologyTypeData". Could not connect to 'net.tcp://ServerB:2660' by 'Windows' authentication.

Why ServerA tries to connect to ServerB even though "ServerAEnvironmentId" is specified during installing?

How is it possible to use same Topology Manager DB from 2 SDL Web 8?

Regards,

Answer 1

If you have multiple CM Servers in a (logical) CM Environment, you should have only one CmEnvironment entity in Topology Manager, not multiple.

In such a scaled out Environment, it is essential that all CM Servers use the same CM Environment ID. That is why you can specify a CM Environment ID in the installer and why the default value is derived from the CM DB info: this yields a CM Environment ID which is common for all CM Servers in a single CM Environment by default.

You should leave the CoreServiceRootUrl as net.tcp://localhost:2660, so that each Topology Manager node (note that you will automatically scale out Topology Manager too) will use the CM node on the same server.

You should ensure that the WebsiteRootUrl uses the domain name of the load balancer, rather than of an individual back-end node. Again, this is the reason why you can specify the CM Website Root URL in the installer.