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Securing cn=config and allowing micro-engineering
- To: email@example.com
- Subject: Securing cn=config and allowing micro-engineering
- From: Nick Milas <firstname.lastname@example.org>
- Date: Thu, 20 Oct 2011 13:22:52 +0300
- User-agent: Mozilla/5.0 (Windows NT 5.1; rv:7.0.1) Gecko/20110929 Thunderbird/7.0.1
Having migrated from slapd.conf, I would like to ask some questions
regarding cases/scenarios where someone - unintentionally - breaks the
So, let's assume that, due to some misspelling or use of wrong values
(esp. when using a graphical LDAP Browser - like JXplorer - to maintain
the configuration DIT), we have added/modified a setting that would
break the installation without warning.
Are there cases where:
1/ LDAP Server will stop immediately? (It is stated that "Beware: You
can configure cn=config to an unusable state.", ref. with example:
2/ LDAP Server will continue to operate but, if stopped, when restarted
it will not be able to restart?
If the answer to Q1.2 above is yes:
How can we test at any given point the current configuration to make
sure it will be OK if/when restarted (AFAIK, slaptest only tests
slapd.conf and not slapd.d configuration)?
*Question 3* (especially critical if the answer to Q1.1 or Q1.2 above is
If the server is stopped, how can we change manually the config settings
(e.g. by editing slapd.d/ files) to attempt to correct it?
(In one such test I did, I changed - directly in "cn=config.ldif" file -
olcLogLevel as follows:
New state (removed one attribute value and changed the other):
and when I tried to start I got:
ldif_read_file: checksum error on
so I had to re-edit the file and change the values as they were
initially, which allowed the server to start.
So (to *repeat Question 3*), how can we "re-engineer" cn=config settings
when off-line? It is always desirable to be able to do some "low-level
engineering" to the configuration (under administrator's or system
engineer's responsibility) in case something goes wrong. This is also
important in cases of "cloning" the server where we want a copy of the
config but we need to change a few settings in the new context. We need
to avoid things like "checksum error"!
Finally, there might be cases where - after having migrated and worked
for a period using cn=config - business/technical needs require the use
of overlay(s) or other modules like SLAPI, which would not be supported
by cn=config and someone would need to move to slapd.conf configuration
(at least temporarily). If such a need arises,
Is there a tool/method to "migrate" to slapd.conf from a slapd.d
Thanks in advance,