--> Processing Dependency: libdb(x86-64) = 5.3.21-17.el7_0.1 for package: libdb-devel-5.3.21-17.el7_0.1.x86_64
---> Package libss.x86_64 0:1.42.9-4.el7 will be updated
---> Package libss.x86_64 0:1.42.9-7.el7 will be an update
---> Package nagiosxi-deps-el7.noarch 0:2014r2.6-1 will be installed
--> Processing Dependency: gd-devel for package: nagiosxi-deps-el7-2014r2.6-1.noarch
--> Processing Dependency: php-snmp for package: nagiosxi-deps-el7-2014r2.6-1.noarch
--> Processing Dependency: php-mbstring for package: nagiosxi-deps-el7-2014r2.6-1.noarch
---> Package pcre.x86_64 0:8.32-12.el7 will be updated
---> Package pcre.x86_64 0:8.32-14.el7 will be an update
---> Package perl-ExtUtils-ParseXS.noarch 1:3.18-2.el7 will be installed
---> Package perl-Mail-IMAPClient.noarch 0:3.34-1.el7 will be installed
--> Processing Dependency: perl(Parse::RecDescent) for package: perl-Mail-IMAPClient-3.34-1.el7.noarch
---> Package perl-Net-SNMP.noarch 0:6.0.1-7.el7 will be installed
--> Processing Dependency: perl(Crypt::DES) for package: perl-Net-SNMP-6.0.1-7.el7.noarch
---> Package rpm-build-libs.x86_64 0:4.11.1-16.el7 will be updated
---> Package rpm-build-libs.x86_64 0:4.11.1-25.el7 will be an update
---> Package rrdtool.x86_64 0:1.4.9-1.el7 will be installed
--> Processing Dependency: dejavu-lgc-sans-mono-fonts for package: rrdtool-1.4.9-1.el7.x86_64
--> Processing Dependency: dejavu-lgc-sans-fonts for package: rrdtool-1.4.9-1.el7.x86_64
---> Package systemtap-sdt-devel.x86_64 0:2.6-10.el7_1 will be installed
--> Processing Dependency: pyparsing for package: systemtap-sdt-devel-2.6-10.el7_1.x86_64
--> Running transaction check
---> Package libdb.x86_64 0:5.3.21-17.el7 will be updated
--> Processing Dependency: libdb(x86-64) = 5.3.21-17.el7 for package: libdb-utils-5.3.21-17.el7.x86_64
---> Package libdb.x86_64 0:5.3.21-17.el7_0.1 will be an update
---> Package nagiosxi-deps-el7.noarch 0:2014r2.6-1 will be installed
--> Processing Dependency: gd-devel for package: nagiosxi-deps-el7-2014r2.6-1.noarch
--> Processing Dependency: php-snmp for package: nagiosxi-deps-el7-2014r2.6-1.noarch
--> Processing Dependency: php-mbstring for package: nagiosxi-deps-el7-2014r2.6-1.noarch
---> Package perl-Mail-IMAPClient.noarch 0:3.34-1.el7 will be installed
--> Processing Dependency: perl(Parse::RecDescent) for package: perl-Mail-IMAPClient-3.34-1.el7.noarch
---> Package perl-Net-SNMP.noarch 0:6.0.1-7.el7 will be installed
--> Processing Dependency: perl(Crypt::DES) for package: perl-Net-SNMP-6.0.1-7.el7.noarch
---> Package pyparsing.noarch 0:1.5.6-9.el7 will be installed
---> Package rrdtool.x86_64 0:1.4.9-1.el7 will be installed
--> Processing Dependency: dejavu-lgc-sans-mono-fonts for package: rrdtool-1.4.9-1.el7.x86_64
--> Processing Dependency: dejavu-lgc-sans-fonts for package: rrdtool-1.4.9-1.el7.x86_64
--> Running transaction check
---> Package libdb-utils.x86_64 0:5.3.21-17.el7 will be updated
---> Package libdb-utils.x86_64 0:5.3.21-17.el7_0.1 will be an update
---> Package nagiosxi-deps-el7.noarch 0:2014r2.6-1 will be installed
--> Processing Dependency: gd-devel for package: nagiosxi-deps-el7-2014r2.6-1.noarch
--> Processing Dependency: php-snmp for package: nagiosxi-deps-el7-2014r2.6-1.noarch
--> Processing Dependency: php-mbstring for package: nagiosxi-deps-el7-2014r2.6-1.noarch
---> Package perl-Mail-IMAPClient.noarch 0:3.34-1.el7 will be installed
--> Processing Dependency: perl(Parse::RecDescent) for package: perl-Mail-IMAPClient-3.34-1.el7.noarch
---> Package perl-Net-SNMP.noarch 0:6.0.1-7.el7 will be installed
--> Processing Dependency: perl(Crypt::DES) for package: perl-Net-SNMP-6.0.1-7.el7.noarch
---> Package rrdtool.x86_64 0:1.4.9-1.el7 will be installed
--> Processing Dependency: dejavu-lgc-sans-mono-fonts for package: rrdtool-1.4.9-1.el7.x86_64
--> Processing Dependency: dejavu-lgc-sans-fonts for package: rrdtool-1.4.9-1.el7.x86_64
--> Finished Dependency Resolution
Error: Package: rrdtool-1.4.9-1.el7.x86_64 (nagiosxi-deps)
Requires: dejavu-lgc-sans-fonts
Error: Package: perl-Net-SNMP-6.0.1-7.el7.noarch (epel)
Requires: perl(Crypt::DES)
Error: Package: rrdtool-1.4.9-1.el7.x86_64 (nagiosxi-deps)
Requires: dejavu-lgc-sans-mono-fonts
Error: Package: nagiosxi-deps-el7-2014r2.6-1.noarch (/nagiosxi-deps-el7-2014r2.6-1.noarch)
Requires: php-snmp
Error: Package: perl-Mail-IMAPClient-3.34-1.el7.noarch (epel)
Requires: perl(Parse::RecDescent)
Error: Package: nagiosxi-deps-el7-2014r2.6-1.noarch (/nagiosxi-deps-el7-2014r2.6-1.noarch)
Requires: php-mbstring
Error: Package: nagiosxi-deps-el7-2014r2.6-1.noarch (/nagiosxi-deps-el7-2014r2.6-1.noarch)
Requires: gd-devel
You could try using --skip-broken to work around the problem
You could try running: rpm -Va --nofiles --nodigest
Nagios XI Installation Log
This is just the last part of the log, I cant past it all here.
To be clear - your install log indicates specifically that the packages required from the optional channel are causing dependency check errors. This leads me to believe that you have an issue with your optional channel subscription.
Verify that optional is enabled. If it is you'll likely have to get in touch with RedHat for support. We cannot provide those packages for obvious reasons.