Starting installation and configuration on several VPS (OpenVZ viruals machines) systems over and ovr again following the instructions on http://www.zabbix.com/wiki/doku.php?...:centosinstall, I'am simply not able to get Zabbix working.

See the following:

From what I see when I test the operation of zabbix is that the agent and server do indeed communicate, but somehow the data isn't aggregated in MySQL. I can't see any data comming in under Zabbix Front End "Monitoring | Latest Data" and the log files seem tobe correct also!!

1) This are the tests I've done to conclude that communication is correct:

1.1) Check if SERVER sees the agent:

1. netstat -an |grep :10051
   tcp 0 0 192.168.2.208:10051 0.0.0.0:* LISTEN
   tcp 0 0 192.168.2.208:10051 192.168.2.206:55211 TIME_WAIT

1.2) check if agent is working:

1. zabbix_get -s php4.cellar.home -k system.hostname
   php4.cellar.home

1. zabbix_get -s php4.cellar.home -k system.localtime
   1193133010

2) Remarks:
2.1) zabbix_sender not working. So maybe the server daemon isn't accepting any send requests from the agent?

1. zabbix_sender -zzabbix.cellar.home -p10051 -sphp4 -ksystem.hostname -ophp4 -v
   zabbix_sender [1574]: Warning: Incorrect answer from server [NOT OK]
   sent: 0; failed: 1; total: 1

2.2) The zabbix configuration of the host "php4.cellar.home" in the frontend reports Availability "Unknown"

2.3) The latest view under monitoring says (01.01.1970 01:00:00 I'm puzzled??):

2.4) When I execute "zabbix_get -s php4.cellar.home -k system.hostname" on the server the log on the client shows it:

32666:20071023:121701 Before read
32666:20071023:121701 In parse_list_of_checks('ZBX_EOF
')
32666:20071023:121701 In disable_all_metrics()
32666:20071023:121701 Parsed [ZBX_EOF]
32666:20071023:121701 In process_active_checks('zabbix.cellar.home',10051)
32666:20071023:121701 In get_min_nextcheck()
32666:20071023:121701 Sleeping for 60 seconds
32663:20071023:121731 Processing request.
32663:20071023:121731 In check_security()
32663:20071023:121731 Requested [system.hostname]
32663:20071023:121731 Before
32663:20071023:121731 Run remote command [hostname] Result [16] [php4.cellar.home]...
32663:20071023:121731 Sending back [php4.cellar.home]

3) These are the logs:

SERVER:
32734:20071023:055824 Starting zabbix_server. ZABBIX 1.4.2.
32734:20071023:055824 **** Enabled features ****
32734:20071023:055824 SNMP monitoring: NO
32734:20071023:055824 WEB monitoring: YES
32734:20071023:055824 Jabber notifications: NO
32734:20071023:055824 **************************
32738:20071023:055824 server #1 started [Poller. SNMP:OFF]
32740:20071023:055824 server #2 started [Poller. SNMP:OFF]
32742:20071023:055824 server #3 started [Poller. SNMP:OFF]
32744:20071023:055824 server #4 started [Poller. SNMP:OFF]
32746:20071023:055824 server #5 started [Poller. SNMP:OFF]
32748:20071023:055824 server #6 started [Poller. SNMP:OFF]
32749:20071023:055824 server #7 started [Poller. SNMP:OFF]
32752:20071023:055824 server #8 started [Poller. SNMP:OFF]
32754:20071023:055824 server #9 started [Poller. SNMP:OFF]
32756:20071023:055824 server #10 started [Poller. SNMP:OFF]
32758:20071023:055824 server #11 started [Poller. SNMP:OFF]
32760:20071023:055824 server #12 started [Poller. SNMP:OFF]
32762:20071023:055824 server #13 started [Poller. SNMP:OFF]
32764:20071023:055824 server #14 started [Poller. SNMP:OFF]
32765:20071023:055824 server #15 started [Poller. SNMP:OFF]
32767:20071023:055824 server #16 started [Trapper]
1325:20071023:055824 server #17 started [Trapper]
1327:20071023:055824 server #18 started [Trapper]
1329:20071023:055824 server #19 started [Trapper]
1331:20071023:055824 server #20 started [Trapper]
1333:20071023:055824 server #21 started [ICMP pinger]
1335:20071023:055824 server #22 started [Alerter]
1337:20071023:055824 server #23 started [Housekeeper]
1337:20071023:055824 Executing housekeeper
1339:20071023:055824 server #24 started [Timer]
1341:20071023:055824 server #25 started [Poller for unreachable hosts. SNMP:OFF]
1343:20071023:055824 server #26 started [Node watcher. Node ID:1]
1345:20071023:055825 server #27 started [HTTP Poller]
1351:20071023:055825 server #28 started [Discoverer. SNMP:OFF]
32734:20071023:055825 server #0 started [Watchdog]
1337:20071023:055826 Deleted 0 records from history and trends

AGENTD:
32660:20071023:115559 zabbix_agentd started. ZABBIX 1.4.2.
32661:20071023:115559 zabbix_agentd collector started
32663:20071023:115559 zabbix_agentd listener started
32664:20071023:115559 zabbix_agentd listener started
32665:20071023:115559 zabbix_agentd listener started
32666:20071023:115559 zabbix_agentd active check started [zabbix.cellar.home:10051]
32666:20071023:115559 In init_active_metrics()
32666:20071023:115559 In refresh_metrics('zabbix.cellar.home',10051)
32666:20071023:115559 get_active_checks('zabbix.cellar.home',10051)
32666:20071023:115559 Sending [ZBX_GET_ACTIVE_CHECKS
php4
]

4) This is the Configuration:

4.1) Server (CentOS v5): zabbix.cellar.home / 192.168.2.208
4.2) Agent: (CentOS v4.4): php4.cellar.home / 192.168.2.206
4.3) Both hosted as Virtual Private machines in OpenVZ running in CentOS v4.4

4.4) /etc/services fo both SERVER & AGENTD:
zabbix_agent 10050/tcp #zabbix ports
zabbix_trap 10051/tcp #zabbix ports

4.5) SERVER ZABBIX config file /etc/zabbix/zabbix_server.conf:

NodeID=1
StartPollers=15
StartPollersUnreachable=1
StartTrappers=5
StartPingers=1
StartDiscoverers=1
StartHTTPPollers=1
ListenPort=10051
ListenIP=192.168.2.208
HousekeepingFrequency=1
SenderFrequency=30
#DisableHousekeeping=1
DebugLevel=3
Timeout=5
TrapperTimeout=10
UnreachablePeriod=45
UnavailableDelay=15
UnavailableDelay=60
PidFile=/tmp/zabbix_server.pid
LogFile=/tmp/zabbix_server.log
LogFileSize=2
AlertScriptsPath=/home/zabbix/bin/
#ExternalScripts=/etc/zabbix/externalscripts
FpingLocation=/usr/sbin/fping
PingerFrequency=30
DBHost=localhost
DBName=zabbix
DBUser=zabbix
DBPassword=test
#DBSocket=/var/lib/mysql/mysql.sock

4.6) AGENT ZABBIX config file /etc/zabbix/zabbix_agentd.conf:

Server=zabbix.cellar.home
ServerPort=10051
Hostname=php4.cellar.home
ListenPort=10050
ListenIP=192.168.2.206
StartAgents=5
RefreshActiveChecks=60
DisableActive=0
EnableRemoteCommands=1
DebugLevel=5
PidFile=/tmp/zabbix_agentd.pid
LogFile=/tmp/zabbix_agentd.log
LogFileSize=2
Timeout=10

1. 1. 1. 1. 1. 1. 1. USER-DEFINED MONITORED PARAMETERS #######
                     UserParameter=system.test,who|wc -l
      2. Set of parameter for monitoring MySQL server (v3.23.42 and later)
      3. Change -u<username> and add -p<password> if required
         #UserParameter=mysql.ping,mysqladmin -uroot ping|grep alive|wc -l
         #UserParameter=mysql.uptime,mysqladmin -uroot status|cut -f2 -d":"|cut -f1 -d"T"
         #UserParameter=mysql.threads,mysqladmin -uroot status|cut -f3 -d":"|cut -f1 -d"Q"
         #UserParameter=mysql.questions,mysqladmin -uroot status|cut -f4 -d":"|cut -f1 -d"S"
         #UserParameter=mysql.slowqueries,mysqladmin -uroot status|cut -f5 -d":"|cut -f1 -d"O"
         #UserParameter=mysql.qps,mysqladmin -uroot status|cut -f9 -d":"
         UserParameter=mysql.version,mysql -V