Awesome

ReOpenLDAP

Production-ready replacement for OpenLDAP on Linux:

A lot of bug fixing and code quality improvement.
A number of new features, most of which deal with highload and multi-master clustering.
Bundled with all known contributed extensions.
Clean build without warnings from modern compilers.
But only Linux supported, e.g no Windows, Mac OS, FreeBSD, Solaris or HP-UX.

ReOpenLDAP is currently running in telcos across Russia:

Several clusters in full mesh multi-master replication topology, mostly with four nodes as a two geographically distributed pairs.
Up to 100 million records and up to 100 GB of data on each node.
Up to 10K updates and up to 25K searches per second.

No other LDAP server can provide such level of performance nowadays due to replication troubles, inadequate performance or high risk of a crash. Therefore ReopenLDAP also known as "TelcoLDAP" - the telco-oriented fork of OpenLDAP.

Features and Change List

Below is a list of main new features of ReOpenLDAP, for a description ones please see the corresponding man pages after installation, i.e. man --manpath=CONFIGURED_PREFIX/share/man slapd.conf.

For latest news and changes please refer to the NEWS.md and ChangeLog.

List of changes emerged from OpenLDAP project could be seen in the CHANGES.OpenLDAP.

Added features:

multi-master replication is working properly and robustly (it seems no other LDAP server can do this)
reopenldap [iddqd] [idkfa]
quorum { [vote-sids ...] [vote-rids ...] [auto-sids] [auto-rids] [require-sids ...] [require-rids ...] [all-links] }
quorum limit-concurrent-refresh
biglock { none | local | common }
storage (mdb backend): dreamcatcher & oom-handler (ITS#7974), lifo & coalesce (ITS#7958)
syncprov-showstatus { none | running | all }
syncrepl's requirecheckpresent option
keepalive <idle>:<probes>:<interval> for incoming connections
built-in memory checker called 'Hipagut', including ls-malloc
support for OpenSSL 1.1.x, Mozilla NSS, GnuTLS and LibreSSL 2.5.x
ready for LTO (Link-Time Optimization) by GCC and clang.

Installation

Traditional triade ./configure --prefix=YOUR_INSTALLATION_PREFIX YOUR_OPTIONS && make && make install. However the configure will absent, in case you use development or a snapshot versions, so you need run the ./bootstrap to build them.

For more information please see INSTALL.

`configure`'s options

Below is a main configure's options, to see full list please run ./configure --help, for instance both --libexecdir=DIR and --sysconfdir=DIR are provided.

Fine tuning of the installation directories:
  --bindir=DIR            user executables [EPREFIX/bin]
  --sbindir=DIR           system admin executables [EPREFIX/sbin]
  --libexecdir=DIR        program executables [EPREFIX/libexec]
  --sysconfdir=DIR        read-only single-machine data [PREFIX/etc]
  --sharedstatedir=DIR    modifiable architecture-independent data [PREFIX/com]
  --localstatedir=DIR     modifiable single-machine data [PREFIX/var]
  --runstatedir=DIR       modifiable per-process data [LOCALSTATEDIR/run]
  --libdir=DIR            object code libraries [EPREFIX/lib]
  --includedir=DIR        C header files [PREFIX/include]
  --oldincludedir=DIR     C header files for non-gcc [/usr/include]
  --datarootdir=DIR       read-only arch.-independent data root [PREFIX/share]
  --datadir=DIR           read-only architecture-independent data [DATAROOTDIR]
  --infodir=DIR           info documentation [DATAROOTDIR/info]
    ...

Optional Features:
    ...
  --enable-debug          enable debug logging no|yes|extra [yes]
  --enable-ci             enable Continuous Integration stuff no|yes [no]
  --enable-syslog         enable syslog support [auto]
  --enable-contrib        enable extra plugins and overlays no|yes|broken [no]
  --enable-experimental   enable experimental and developing features no|yes [no]
  --enable-check          enable internal checking and assertions no|yes|always|default [no]
  --enable-hipagut        enable internal memory allocation debugger no|yes|always|extra [no]
  --enable-proctitle      enable proctitle support [yes]
  --enable-ipv6           enable IPv6 support [auto]
  --enable-local          enable AF_LOCAL (AF_UNIX) socket support [auto]
  --enable-deprecated     enable deprecated interfaces of libreldap no|yes [no]
  --enable-valgrind       Whether to enable Valgrind on the unit tests
    ...

SLAPD (Standalone LDAP Daemon) Options:
  --enable-slapd	  enable building slapd [yes]
    --enable-dynacl	  enable run-time loadable ACL support (experimental) [no]
    --enable-aci	  enable per-object ACIs (experimental) no|yes|mod [no]
    --enable-cleartext	  enable cleartext passwords [yes]
    --enable-crypt	  enable crypt(3) passwords [no]
    --enable-lmpasswd	  enable LAN Manager passwords [no]
    --enable-spasswd	  enable (Cyrus) SASL password verification [no]
    --enable-modules	  enable dynamic module support [yes]
    --enable-rewrite	  enable DN rewriting in back-ldap and rwm overlay [auto]
    --enable-rlookups	  enable reverse lookups of client hostnames [no]
    --enable-slapi        enable SLAPI support (experimental) [no]
    --enable-slp          enable SLPv2 support [no]
    --enable-wrappers	  enable tcp wrapper support [no]

SLAPD Backend Options:
    --enable-backends	  enable all stable/non-experimental backends no|yes|mod
    --enable-mdb	  enable MDBX database backend no|yes|mod [yes]
    --enable-hdb	  enable Hierarchical Berkeley DB backend (obsolete) no|yes|mod [no]
    --enable-bdb	  enable Berkeley DB backend (obsolete) no|yes|mod [no]
    --enable-dnssrv	  enable dnssrv backend (experimental) no|yes|mod [no]
    --enable-ldap	  enable ldap backend no|yes|mod [no]
    --enable-meta	  enable metadirectory backend no|yes|mod [no]
    --enable-monitor	  enable monitor backend no|yes|mod [yes]
    --enable-ndb	  enable MySQL NDB Cluster backend (experimental) no|yes|mod [no]
    --enable-null	  enable null backend no|yes|mod [no]
    --enable-passwd	  enable passwd backend no|yes|mod [no]
    --enable-perl	  enable perl backend no|yes|mod [no]
    --enable-relay  	  enable relay backend (experimental) no|yes|mod [yes]
    --enable-shell	  enable shell backend no|yes|mod [no]
    --enable-sock	  enable sock backend no|yes|mod [no]
    --enable-sql	  enable SQL backend (experimental and buggy) no|yes|mod [no]

SLAPD Overlay Options:
    --enable-overlays	  enable all available overlays no|yes|mod
    --enable-accesslog	  In-Directory Access Logging overlay no|yes|mod [no]
    --enable-auditlog	  Audit Logging overlay no|yes|mod [no]
    --enable-autoca	  Automatic Certificate Authority overlay no|yes|mod [no]
    --enable-collect	  Collect overlay no|yes|mod [no]
    --enable-constraint	  Attribute Constraint overlay no|yes|mod [no]
    --enable-dds  	  Dynamic Directory Services overlay no|yes|mod [no]
    --enable-deref	  Dereference overlay no|yes|mod [no]
    --enable-dyngroup	  Dynamic Group overlay no|yes|mod [no]
    --enable-dynlist	  Dynamic List overlay no|yes|mod [no]
    --enable-memberof	  Reverse Group Membership overlay no|yes|mod [no]
    --enable-ppolicy	  Password Policy overlay no|yes|mod [no]
    --enable-pcache	  Proxy Cache overlay no|yes|mod [no]
    --enable-refint	  Referential Integrity overlay no|yes|mod [no]
    --enable-retcode	  Return Code testing overlay no|yes|mod [no]
    --enable-rwm       	  Rewrite/Remap overlay no|yes|mod [no]
    --enable-seqmod	  Sequential Modify overlay no|yes|mod [no]
    --enable-sssvlv	  ServerSideSort/VLV overlay no|yes|mod [no]
    --enable-syncprov	  Syncrepl Provider overlay no|yes|mod [yes]
    --enable-translucent  Translucent Proxy overlay no|yes|mod [no]
    --enable-unique       Attribute Uniqueness overlay no|yes|mod [no]
    --enable-valsort      Value Sorting overlay no|yes|mod [no]

Optional Packages:
    ...
  --with-cyrus-sasl	  with Cyrus SASL support [auto]
  --with-gssapi		  with GSSAPI support [auto]
  --with-fetch		  with fetch(3) URL support [auto]
  --with-tls		  with TLS/SSL support auto|openssl|gnutls|moznss [auto]
  --with-yielding-select  with implicitly yielding select [auto]
  --with-mp               with multiple precision statistics auto|longlong|long|bignum|gmp [auto]
  --with-odbc             with specific ODBC support iodbc|unixodbc|auto [auto]

Some influential environment variables:
  ...
  EXTRA_CFLAGS
              Extra build-time CFLAGS, e.g. -Wall -Werror. Alternatively, ones
              can be specified or overridden by invocation 'make
              EXTRA_CFLAGS="a b c"'
  KRB5_CFLAGS C compiler flags for KRB5, overriding pkg-config
  KRB5_LIBS   linker flags for KRB5, overriding pkg-config
  HEIMDAL_CFLAGS
              C compiler flags for HEIMDAL, overriding pkg-config
  HEIMDAL_LIBS
              linker flags for HEIMDAL, overriding pkg-config
  LIBSODIUM_CFLAGS
              C compiler flags for LIBSODIUM, overriding pkg-config
  LIBSODIUM_LIBS
              linker flags for LIBSODIUM, overriding pkg-config
  UUID_CFLAGS C compiler flags for UUID, overriding pkg-config
  UUID_LIBS   linker flags for UUID, overriding pkg-config
  OPENSSL_CFLAGS
              C compiler flags for OPENSSL, overriding pkg-config
  OPENSSL_LIBS
              linker flags for OPENSSL, overriding pkg-config
  GNUTLS_CFLAGS
              C compiler flags for GNUTLS, overriding pkg-config
  GNUTLS_LIBS linker flags for GNUTLS, overriding pkg-config
  MOZNSS_CFLAGS
              C compiler flags for MOZNSS, overriding pkg-config
  MOZNSS_LIBS linker flags for MOZNSS, overriding pkg-config