146
| SMSEagle NXS-9700-3G
| User’s Manual
Failover (HA-cluster) feature
"High-availability clusters (also known as HA clusters or fail over clusters) are groups of computers (...) that can be
reliably utilized with a minimum of down-time. They operate by using high availability software to harness
redundant computers in groups or clusters that provide continued service when system components fail. Without
clustering, if a server running a particular application crashes, the application will be unavailable until the crashed
server is fixed. HA clustering remedies this situation by detecting hardware/software faults, and immediately
restarting the application on another system or whole node without requiring administrative intervention, a process
known as failover."
(source: Wikipedia)
SMSEagle NXS family has its own HA-cluster feature. For service to work you need at least 2 gateways
('aka' nodes). Our service monitors devices working in cluster and detects faults with following functions:
1.
Apache2 WWW server
2.
PostgreSQL database
3.
SNMP agent
4.
Modem software (Gammu-SMSD daemon)
5.
Accessibility (response to ping) of whole node.
Every node in a cluster can have one of three states:
•
Master: first healthy node which became available in a cluster, and is accessible through Virtual IP
•
Backup: second healthy node in a cluster, ready and waiting for replacing Master when needed
•
Fault: node with detected service fault
Basically devices (nodes) should see each other on the network. By default HA-nodes use 224.0.0.18 IP
address for VRRP (Virtual Router Redundancy Protocol) for communication between two nodes for health
check. If nodes are on the same network (same subnet & IP range) there is no need for any network
configuration. If two nodes are behind firewalls, make sure firewall is configured to accept multicast and
VRRP protocol (IP Protocol #112).
Содержание NXS-9700
Страница 1: ...User s Manual SMSEAGLE NXS 9700...
Страница 7: ...7 SMSEagle NXS 9700 3G User s Manual GET READY TO START I...
Страница 13: ...13 SMSEagle NXS 9700 3G User s Manual USING OF SMSEAGLE II...
Страница 145: ...145 SMSEagle NXS 9700 3G User s Manual 8 To enable v2 access policy run snmpv3 enablev2...
Страница 151: ...151 SMSEagle NXS 9700 3G User s Manual TROUBLESHOOTING I I I I I I...
Страница 155: ...155 SMSEagle NXS 9700 3G User s Manual SERVICE REPAIR IV I...
Страница 157: ...157 SMSEagle NXS 9700 3G User s Manual TECH SPECS SAFETY INFORMATION V I...