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High Availability / Clustering
Ive read through most of the archives concerning high-availability
options for openldap. Right now, we're trying to create make our ldap
infrastructure highly-available, as well as load-balanced between three
servers (more to be added later). From my research it seems like we
have a few options:
1) Experimental Multi-Master: This seems to have a number of atomicity
issues. Plus this doesn't really solve the problem with the ldap
clients not appropriately using the second listed server if the first
2) Plain old Master + Multiple Slaves: Same second issue above, plus no
high availability on writes.
3) Master + Slaves, Promotion of Slave if master goes down: Same ldap
client not using second listed server problem as in 1) and 2) above,
plus lots of issues with reclaiming Master status after failure.
4) 1 Master Server Cluster using shared storage: This seems like the
only viable solutions. The problem is we need support for many servers
connecting to one shared storage device, as well some sort of reliable
locking mechanism thats compatible with openldap.
Has anyone successfully implemented 4) ? If so can you recommend any
specific hardware and or software that works nicely with openldap?