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Load Balancer

May 20th, 2007

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DNS caching on linux server for perf-improvement?

Background:

I have a CGI script (served by Apache on Linux) that gets called about once per second or more on my web-site. This script calls (via perl LWP) a webservice on an external site (see http://gisdata.usgs.gov), parses the results and returns a subset of them.

Problem:

It usually returns pretty quick (<200ms), but sometimes there is 1+ seconds lost in just resolving the IP of the domain of the 3rd party web-service. Solutions? I could hard-code the IP, but that's always error-prone, there's got to be a better way. Plus they're using a load-balancer, so I don't want to target one IP if they expect the traffic to be balanced. What I want to avoid is the round-trip to my ISP's name-server for *each and every* request to resolve the same domain. I think I could run bind on the server, and use that to resolve, but is there a simpler way? An app I can run in the background that will just keep track of commonly-looked-up DNS names?

it's not perl it's not apache.... dns caching is tricky... I know it can be managed but I don't know enough to shoot from the hip.

But, you can simply add the gov site with which you are concerned to your /etc/hosts file and bypass the dns... of course if our government moves, you will have to update that file... but since you know perl... you can do a lookup ever hour or day and fix the hosts file!

the time difference is the lookup vs using the cached address.

depending on the kind of load balancing they are doing, they may have just 1 outside address, then the route to various inside addresses.

Also, you could do your own dns... HA HA!

Find Load Balancer On eBay Below:

f5 1500 ltm c36 model 200 0138 03 rev d
f5 1500 ltm c36 model 200 0138 03 rev d
$77.00
f5 1500 LTM c36 model 200 0226 00 rev c
f5 1500 LTM c36 model 200 0226 00 rev c
$71.00
Coyote Point Equalizer E650si Load Balancing Device For Parts
Coyote Point Equalizer E650si Load Balancing Device For Parts
$79.00
BARRACUDA LOAD BALANCER 340
BARRACUDA LOAD BALANCER 340
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Peplink Balance 380 Rev 5 USED
Peplink Balance 380 Rev 5 USED
$1,500.00
BPL 710 Peplink Balance 710 NEW
BPL 710 Peplink Balance 710 NEW
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F5 Networks BigIP LTM 1500 Untested
F5 Networks BigIP LTM 1500 Untested
$39.61
Bluecoat AV1200 A Proxy Security Appliance w Xeon E5504 20GHz CPU
Bluecoat AV1200 A Proxy Security Appliance w Xeon E5504 20GHz CPU
$195.00
F5 Networks BIG IP 3400 Local Traffic Manager 200 0226 01 REV a
F5 Networks BIG IP 3400 Local Traffic Manager 200 0226 01 REV a
$99.00
A10 Networks AX 1030 AX1030 Load Balancer Tested
A10 Networks AX 1030 AX1030 Load Balancer Tested
$1,980.00
Bluecoat Packetshaper 10000 310MB Load Balancer Tested
Bluecoat Packetshaper 10000 310MB Load Balancer Tested
$1,150.00
Coyote Point Equalizer E650GX Load Balancer
Coyote Point Equalizer E650GX Load Balancer
$150.00
NEW F5 BIG IP BIG LTM 8800 Application Switch Local Traffic Manager v94 4GB RS
NEW F5 BIG IP BIG LTM 8800 Application Switch Local Traffic Manager v94 4GB RS
$3,000.00
TP Link SafeStream TL R470T+ Fast Ethernet Load Balance Broadband Router New
TP Link SafeStream TL R470T+ Fast Ethernet Load Balance Broadband Router New
$65.99
NEW F5 Networks FirePass 4300 Dual Power supply 475W F5 UPG AC 475W R
NEW F5 Networks FirePass 4300 Dual Power supply 475W F5 UPG AC 475W R
$176.56
F5 Networks VIPRION 4450 Blade
F5 Networks VIPRION 4450 Blade
$1,369.99
F5 Networks BIG LTM 2000S 8GB BIG IP Load Balancer Ver 1161 +2 x PSU + Rails
F5 Networks BIG LTM 2000S 8GB BIG IP Load Balancer Ver 1161 +2 x PSU + Rails
$2,800.00
Radware AppDirector 208 ODS VL 4GB SFP HDD OnDemand Switch Network Load Balancer
Radware AppDirector 208 ODS VL 4GB SFP HDD OnDemand Switch Network Load Balancer
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Coyote Point Equalizer E650GX Load Balancer
Coyote Point Equalizer E650GX Load Balancer
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F5 networks 3400 Big IP LTM Application Switch Traffic Manager Load Balancer
F5 networks 3400 Big IP LTM Application Switch Traffic Manager Load Balancer
$100.88
Lot of 2 Packeteer Packetshaper 1550 Parts Repair
Lot of 2 Packeteer Packetshaper 1550 Parts Repair
$89.10
Riverbed Steelhead SHA 01050 M w Licenses 1300 Conn Riverbed Specialists
Riverbed Steelhead SHA 01050 M w Licenses 1300 Conn Riverbed Specialists
$750.00
F5 Networks BIGIP 1 HRM Load Balancing Switch Tested Working
F5 Networks BIGIP 1 HRM Load Balancing Switch Tested Working
$14.99
F5 Network Big IP 1600 Series Load Balancer w Rack Ears 2x FNP 300 Power Supply
F5 Network Big IP 1600 Series Load Balancer w Rack Ears 2x FNP 300 Power Supply
$99.00
Riverbed SteelFusion SFED 02100 B010 50MB 5K Connections Riverbed Specialists
Riverbed SteelFusion SFED 02100 B010 50MB 5K Connections Riverbed Specialists
$9,995.00
Packeteer Packetshaper 6500 065 10021608 Dual Power Eth
Packeteer Packetshaper 6500 065 10021608 Dual Power Eth
$355.49
Peplink Balance 20 BPL 021 Dual Wan Router
Peplink Balance 20 BPL 021 Dual Wan Router
$180.00
Juniper DX 3680 SLB SSL S 4G
Juniper DX 3680 SLB SSL S 4G
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Barracuda Networks Link Balancer 330 Network Management Device Lot of 2
Barracuda Networks Link Balancer 330 Network Management Device Lot of 2
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Riverbed Steelhead SHA 05050 L w Licenses 7500 Connections Riverbed Specialists
Riverbed Steelhead SHA 05050 L w Licenses 7500 Connections Riverbed Specialists
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Foundry ServerIronXL Application Switch FCSLB16
Foundry ServerIronXL Application Switch FCSLB16
$95.00
Kemp LoadMaster LM 3500 NSA 1083L Server Load Balancer w Rackmount
Kemp LoadMaster LM 3500 NSA 1083L Server Load Balancer w Rackmount
$297.42
Riverbed Steelhead CXA 00555 B010 w H License 650 Conn Riverbed Specialists
Riverbed Steelhead CXA 00555 B010 w H License 650 Conn Riverbed Specialists
$400.00
FatPipe FAT PIPE WARP Load Balancer 10MB 1900 W10 1
FatPipe FAT PIPE WARP Load Balancer 10MB 1900 W10 1
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2xRiverbed Steelhead CXA 00255 B010 w L License Basic  Riverbed v92 NEW
2xRiverbed Steelhead CXA 00255 B010 w L License Basic Riverbed v92 NEW
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TP Link SafeStream TL R470T+ Fast Ethernet Load Balance Broadband Router
TP Link SafeStream TL R470T+ Fast Ethernet Load Balance Broadband Router
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Packeteer iSHARED 100 Load Balancer Xeon 3 ghz 2GB RAM 2x 250GB HARD DRIVE
Packeteer iSHARED 100 Load Balancer Xeon 3 ghz 2GB RAM 2x 250GB HARD DRIVE
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BlueCoat 510 SG510 10 PR Proxy SG Appliance
BlueCoat 510 SG510 10 PR Proxy SG Appliance
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Citrix 9010C Netscaler 9010 4port Copper Access Gateway NS 9010C
Citrix 9010C Netscaler 9010 4port Copper Access Gateway NS 9010C
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