Description of problem:
SELinux is preventing logrotate from 'write' accesses on the directory /var/cache/dnf/x86_64/21.

*****  Plugin restorecon (94.8 confidence) suggests   ************************

If you want to fix the label. 
/var/cache/dnf/x86_64/21 default label should be rpm_var_cache_t.
Then you can run restorecon.
Do
# /sbin/restorecon -v /var/cache/dnf/x86_64/21

*****  Plugin catchall_labels (5.21 confidence) suggests   *******************

If you want to allow logrotate to have write access on the 21 directory
Then you need to change the label on /var/cache/dnf/x86_64/21
Do
# semanage fcontext -a -t FILE_TYPE '/var/cache/dnf/x86_64/21'
where FILE_TYPE is one of the following: NetworkManager_log_t, abrt_var_cache_t, abrt_var_log_t, acct_data_t, afs_logfile_t, aide_log_t, amanda_log_t, antivirus_log_t, apcupsd_log_t, apmd_log_t, asterisk_log_t, auth_cache_t, bacula_log_t, bitlbee_log_t, boinc_log_t, calamaris_log_t, callweaver_log_t, canna_log_t, ccs_var_lib_t, ccs_var_log_t, certmaster_var_log_t, cfengine_log_t, cgred_log_t, checkpc_log_t, chronyd_var_log_t, cinder_log_t, cloud_log_t, cluster_var_log_t, cobbler_var_log_t, condor_log_t, conman_log_t, consolekit_log_t, couchdb_log_t, cron_log_t, ctdbd_log_t, cupsd_log_t, cyphesis_log_t, ddclient_log_t, deltacloudd_log_t, denyhosts_var_log_t, devicekit_var_log_t, dirsrv_snmp_var_log_t, dirsrv_var_log_t, dlm_controld_var_log_t, dnsmasq_var_log_t, docker_log_t, dovecot_var_log_t, dspam_log_t, evtchnd_var_log_t, exim_log_t, fail2ban_log_t, faillog_t, fenced_var_log_t, fetchmail_log_t, fingerd_log_t, firewalld_var_log_t, foghorn_var_log_t, fsadm_log_t, gear_log_t, getty_log_t, gfs_controld_var_log_t, glance_log_t, glusterd_log_t, groupd_var_log_t, haproxy_var_log_t, httpd_log_t, icecast_log_t, inetd_log_t, initrc_var_log_t, innd_log_t, ipsec_log_t, iscsi_log_t, iwhd_log_t, jetty_log_t, jockey_var_log_t, kadmind_log_t, keystone_log_t, kismet_log_t, krb5kdc_log_t, ksmtuned_log_t, ktalkd_log_t, lastlog_t, logrotate_tmp_t, logrotate_var_lib_t, mailman_log_t, mcelog_log_t, minidlna_log_t, mirrormanager_log_t, mongod_log_t, motion_log_t, mpd_log_t, mrtg_log_t, munin_log_t, mysqld_log_t, mythtv_var_log_t, naemon_log_t, nagios_log_t, named_cache_t, named_log_t, neutron_log_t, nova_log_t, nscd_log_t, ntpd_log_t, numad_var_log_t, openshift_log_t, openshift_var_lib_t, opensm_log_t, openvpn_status_t, openvpn_var_log_t, openvswitch_log_t, openwsman_log_t, osad_log_t, passenger_log_t, pcp_log_t, piranha_log_t, pki_ra_log_t, pki_tomcat_log_t, pki_tps_log_t, plymouthd_var_log_t, polipo_log_t, postgresql_log_t, pppd_log_t, pptp_log_t, prelink_log_t, prelude_log_t, privoxy_log_t, procmail_log_t, psad_var_log_t, puppet_log_t, pyicqt_log_t, qdiskd_var_log_t, rabbitmq_var_log_t, radiusd_log_t, redis_log_t, rhev_agentd_log_t, rhsmcertd_log_t, ricci_modcluster_var_log_t, ricci_var_log_t, rpm_log_t, rsync_log_t, rtas_errd_log_t, samba_log_t, sanlock_log_t, sectool_var_log_t, sendmail_log_t, sensord_log_t, setroubleshoot_var_log_t, shorewall_log_t, slapd_log_t, slpd_log_t, smsd_log_t, snapperd_log_t, snmpd_log_t, snort_log_t, spamd_log_t, speech-dispatcher_log_t, squid_log_t, sssd_var_log_t, stapserver_log_t, sysstat_log_t, systemd_passwd_var_run_t, thin_aeolus_configserver_log_t, thin_log_t, tmp_t, tomcat_log_t, tor_var_log_t, tuned_log_t, ulogd_var_log_t, uucpd_log_t, var_lib_t, var_lock_t, var_log_t, var_spool_t, varnishlog_log_t, vdagent_log_t, virt_cache_t, virt_log_t, virt_qemu_ga_log_t, vmware_log_t, watchdog_log_t, winbind_log_t, wtmp_t, xdm_log_t, xend_var_log_t, xenstored_var_log_t, xferlog_t, xserver_log_t, zabbix_log_t, zarafa_deliver_log_t, zarafa_gateway_log_t, zarafa_ical_log_t, zarafa_indexer_log_t, zarafa_monitor_log_t, zarafa_server_log_t, zarafa_spooler_log_t, zebra_log_t, zoneminder_log_t. 
Then execute: 
restorecon -v '/var/cache/dnf/x86_64/21'


*****  Plugin catchall (1.44 confidence) suggests   **************************

If you believe that logrotate should be allowed write access on the 21 directory by default.
Then you should report this as a bug.
You can generate a local policy module to allow this access.
Do
allow this access for now by executing:
# grep logrotate /var/log/audit/audit.log | audit2allow -M mypol
# semodule -i mypol.pp

Additional Information:
Source Context                system_u:system_r:logrotate_t:s0-s0:c0.c1023
Target Context                unconfined_u:object_r:var_t:s0
Target Objects                /var/cache/dnf/x86_64/21 [ dir ]
Source                        logrotate
Source Path                   logrotate
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           
Target RPM Packages           
Policy RPM                    selinux-policy-3.13.1-103.fc21.noarch
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Permissive
Host Name                     (removed)
Platform                      Linux (removed) 3.18.3-201.fc21.x86_64+debug #1
                              SMP Mon Jan 19 15:44:15 UTC 2015 x86_64 x86_64
Alert Count                   1
First Seen                    2015-01-25 03:39:01 YEKT
Last Seen                     2015-01-25 03:39:01 YEKT
Local ID                      cf69edca-a8e9-4ebf-bc86-bac1b1f207fc

Raw Audit Messages
type=AVC msg=audit(1422139141.347:1609): avc:  denied  { write } for  pid=32048 comm="logrotate" name="21" dev="sda1" ino=1572568 scontext=system_u:system_r:logrotate_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:var_t:s0 tclass=dir permissive=1


Hash: logrotate,logrotate_t,var_t,dir,write

Version-Release number of selected component:
selinux-policy-3.13.1-103.fc21.noarch

Additional info:
reporter:       libreport-2.3.0
hashmarkername: setroubleshoot
kernel:         3.18.3-201.fc21.x86_64+debug
type:           libreport