slapd ldapi socket.

- Specify the `/run/slapd` volume in the Dockerfile.
- Document TCP ports and Unix socket for slapd.

slapd/Dockerfile

@@ -11,6 +11,7 @@ RUN echo 'deb http://deb.debian.org/debian stretch-backports main' > /etc/apt/so
 COPY --chown=root:root entrypoint /
 EXPOSE 389 636
 VOLUME [ "/var/lib/ldap" ]
+VOLUME [ "/run/ldap" ]
 ENV LDAP_URLS="ldap:/// ldapi:/// ldaps:///" \
     SLAPD_DEBUG_LEVEL="NONE"
 ENTRYPOINT [ "/entrypoint" ]

slapd/README.md

@@ -2,6 +2,11 @@
 
 > Dockerized OpenLDAP daemon.
 
+## Interfaces exposed
+
+The container exposes TCP ports 389 (LDAP) and 636 (LDAPS) as well as the
+`ldapi` Unix socket in the `/run/slapd` volume.
+
 ## Environment variables
 
 Name | Description | Default value