> So your 4 write servers are in mmr. Then you have 2 -> N read-onlys
> as well which scale up and down.
> 
> Do you plan to have ldap.example.com point to the IP's of the
> read-onlys directly? Or to a load balancer?
> 

yes, we already got that.


> If this was me, just because of the scaling requirements, I would
> actually recommend TLS termination on the load balancer, then ldap
> plaintext to the 2 -> N consumers (or ldaps to the consumers where
> the LB trusts the CA that signed the readonlies. IE:
> 
> 
> Client -- TLS connection 1 --> [ LB ] -- TLS Connection 2 -->
> [READ_ONLIES]
> 
> TLS connection 1 is presented by the LB, which offers a valid cert/ca
> chain. The LB then would re-encrypt but trusting the CA of tls
> connection 2 which is a self signed to the read_onlies.
> 

OK, I'll try with this approach.


> Another main point here is you'll need to automate that when a
> read-only is scaled up (added), you'll need to automate the addition
> of the replication agreements to the write servers + conduct a full
> reinit on first start.
>

I'm working on that, as you can see from my previous posts, I'm developing our 
custom MMR script to automate everything.


 
> Does that help?
>

Indeed. Thanks a lot for your time,

abosch

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