Install zabbix server

Install software

portmaster -d net-mgmt/zabbix6-server net-mgmt/zabbix6-agent

Config

cp /usr/local/etc/zabbix6/zabbix_server.conf.sample /usr/local/etc/zabbix6/zabbix_server.conf
cp /usr/local/etc/zabbix6/zabbix_agentd.conf.sample /usr/local/etc/zabbix6/zabbix_agentd.conf

vi /usr/local/etc/zabbix6/zabbix_server.conf

DBHost=192.168.222.32
DBName=zabbix
DBUser=zabbix
DBPassword=39zabbix
DBPort=5432
#for localhost
#DBSocket=/tmp
StartProxyPollers=3
ProxyConfigFrequency=300

CacheSize=512M
HistoryCacheSize=512M
TrendCacheSize=256M
ValueCacheSize=512M

Adjust sysctl

vi /etc/sysctl.conf

#All shared memory no more than 8G
kern.ipc.shmall=2097152 
#Shared memory no more that 512M
kern.ipc.shmmax=536870912

Start zabbix server

vi /etc/rc.conf

zabbix_server_enable="YES"
zabbix_agentd_enable="YES"

service zabbix_server start
service zabbix_agentd start

Set up SNMP trap

Perl trap convertor

vi /usr/local/etc/zabbix6/zabbix_server.conf

StartSNMPTrapper=1
SNMPTrapperFile=/tmp/zabbix_traps.tmp

Downlaod trap convertor

curl "https://git.zabbix.com/projects/ZBX/repos/zabbix/raw/misc/snmptrap/zabbix_trap_receiver.pl" > /tmp/zabbix_trap_receiver.pl
chmod +x /tmp/zabbix_trap_receiver.pl

Fix some script

# print the PDU info
print OUTPUT_FILE "PDU INFO:\n";
foreach my $key ( reverse sort keys(%pdu_info) ) {
	next if ( $key eq "community" );
	next if ( $key eq "receivedfrom" );
	if ( $pdu_info{$key} !~ /^[[:print:]]*$/ ) {
		my $OctetAsHex =
		  unpack( 'H*', $pdu_info{$key} );    # convert octet string to hex
		$pdu_info{$key} = "0x$OctetAsHex";    # apply 0x prefix for consistency
	}
	printf OUTPUT_FILE "  %-20s %s\n", $key, $pdu_info{$key};
}

foreach my $x (@varbinds) {
	printf OUTPUT_FILE "  %s type=%d value=%s\n", $x->[0], $x->[2], $x->[1];
}

Config trapd

mkdir /usr/local/etc/snmp/
vi /usr/local/etc/snmp/snmptrapd.conf

authCommunity execute public
perl do "/tmp/zabbix_trap_receiver.pl";

Edit new syslogd vi /usr/local/etc/newsyslog.conf.d/zbx_trap.conf

# logfilename          [owner:group]    mode count size when  flags [/pid_file] [sig_num]
/tmp/zabbix_traps.tmp                   644  0     100  *     J     /var/run/snmptrapd.pid