Repeatable GSLB Configuration for each DNS name: ), and delegate the sub-zone to all ADNS listeners. Delegate DNS sub-zone to ADC ADNS – in the original DNS zone, create a new sub-zone (e.g.Or you can subscribe to a geolocation service, and import its database. Import Static Proximity Database – Citrix ADC includes a database that can be used to determine the geographical location of an IP address.GSLB Sites are also the IP address endpoints for Citrix ADC’s proprietary Metric Exchange Protocol (MEP), which is used by GSLB to transmit proximity, persistence, and monitoring information. Create GSLB Sites (aka MEP Listener) – GSLB Sites usually correspond to different datacenters.GSLB resolves a DNS query into an IP address, and returns the IP address in the DNS response.
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Create ADNS listener on each ADC pair – DNS clients send DNS queries to the ADNS listeners.One-time GSLB Infrastructure configuration GSLB Configuration can be split between one-time steps for GSLB infrastructure, and repeatable steps for each GSLB-enabled DNS name. See Citrix Blog Post XenDesktop, GSLB & DR – Everything you think you know is probably wrong! GSLB Configuration Overview When configuring GSLB, don’t forget to ask “where is the data?”. If there’s only one IP address, then use normal DNS instead.Ĭitrix Blog Post Global Server Load Balancing: Part 1 explains how DNS queries work and how GSLB fits in. GSLB is only useful if you have a single DNS name that could resolve to two or more IP addresses. Give out different IPs for internal users vs external users (DNS View).Give out the IP address that is closest to the user (proximity load balancing).If the active IP address is down, then give out the passive IP address (active/passive) instead.Don’t give out an IP address unless it is UP (monitoring).GSLB can do some things that DNS servers can’t do:
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The user then connects to the returned IP, which doesn’t even need to be on a NetScaler ADC. GSLB receives a DNS query, and then GSLB sends back an IP address, which is exactly how a DNS server works.
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2019 Feb 12 – Metric Exchange Protocol – added link to CTX244517 Citrix ADC Troubleshooting GSLB MEP and Sync Cheat Sheet.2019 Mar 6 – Geo Location Database – added link to Citrix Github Citrix-ADC-GSLB-GeoIP-Conversion-Tool.2020 Feb 27 – updated link to Citrix Tech Zone Troubleshooting Citrix GSLB MEP Cheat Sheet.
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