Zabbix error:

[Z3001] connection to database ‘zabbix’ failed: [2003] Can't connect to MySQL server on 'mysql-01.abc.xyz.123' (13)

related to:

audit.log:type=AVC msg=audit(1549949080.977:11328): avc:  denied  { name_connect } for  pid=9115 comm="zabbix_server" dest=3306 scontext=system_u:system_r:zabbix_t:s0 tcontext=system_u:object_r:mysqld_port_t:s0 tclass=tcp_socket

is solved by:

# grep AVC /var/log/audit/audit.log | audit2allow -M systemd-allow; semodule -i systemd-allow.pp

Cheers,
TK