fix openldap Dockerfile

openldap/Dockerfile

@@ -1,11 +1,16 @@
 FROM centos:7
 
-RUN yum update -y && yum -y install openldap-servers openldap-clients && yum clean all && chgrp -R root /var/lib/ldap && chmod -R g+rw,o= /var/lib/ldap
+RUN yum update -y \
+ && yum -y install openldap-servers openldap-clients \
+ && yum clean all \
+ && rm -rf /var/cache/yum \
+ && cp /usr/share/openldap-servers/DB_CONFIG.example /var/lib/ldap/DB_CONFIG \
+ && chgrp -R root /var/lib/ldap \
+ && chmod -R g+rw,o= /var/lib/ldap
 
 VOLUME /var/lib/ldap
 WORKDIR /var/lib/ldap
 
-EXPOSE 389 636
+EXPOSE 389
 ENTRYPOINT [ "/usr/sbin/slapd" ]
-CMD [ "-4" ]
-
+CMD [ "-d", "256", "-h", "ldap:///" ]