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Content Tagged High-Availability
Monitoring UPS Power Status Using Network UPS Tools (NUT) 2.2.0 on Multiple OpenSuSE 10.3 Servers
Monitoring UPS Power Status Using Network UPS Tools (NUT) 2.2.0 on Multiple OpenSuSE 10.3 Servers
Network UPS Tools is a collection of programs which provide a common interface for monitoring and administering UPS hardware. The primary goal of the Network UPS Tools (NUT) project is to provide reliable monitoring of UPS hardware and ensure safe shutdowns of the systems which are connected. This document describes how to configure one machine connected to the UPS so it monitors the power status. This can relay alerts to other machines that are running off the same power line. This way, multiple servers can perform a safe shutdown in case of power failure.
Read more...Monitoring UPS Power Status Using Network UPS Tools (NUT) 2.2.0 on Multiple OpenSuSE 10.3 Servers
Monitoring UPS Power Status Using Network UPS Tools (NUT) 2.2.0 on Multiple OpenSuSE 10.3 Servers
Network UPS Tools is a collection of programs which provide a common interface for monitoring and administering UPS hardware. The primary goal of the Network UPS Tools (NUT) project is to provide reliable monitoring of UPS hardware and ensure safe shutdowns of the systems which are connected. This document describes how to configure one machine connected to the UPS so it monitors the power status. This can relay alerts to other machines that are running off the same power line. This way, multiple servers can perform a safe shutdown in case of power failure.
Read more...Setting Up A High-Availability Load Balancer (With Failover and Session Support) With HAProxy/Heartbeat On Fedora 8
Setting Up A High-Availability Load Balancer (With Failover and Session Support) With HAProxy/Heartbeat On Fedora 8
This document describes how to set up a two-node load balancer in an active/passive configuration with HAProxy and heartbeat on Fedora 8. The load balancer acts between the user and two (or more) Apache web servers that hold the same content. The load balancer passes the requests to the web servers and it also checks their health. If one of them is down, all requests will automatically be redirected to the remaining web server(s). In addition to that, the two load balancer nodes monitor each other using heartbeat. If the master fails, the slave becomes the master - users won't notice any disruption of the service. HAProxy is session-aware - you can use it with any web application that makes use of sessions like forums, shopping carts, etc.
Read more...Master-Master Replication With MySQL 5 On Fedora 8
Master-Master Replication With MySQL 5 On Fedora 8
This document describes how to set up master-master replication with MySQL 5 on Fedora 8. Since version 5, MySQL comes with built-in support for master-master replication, solving the problem that can happen with self-generated keys. In former MySQL versions, the problem with master-master replication was that conflicts arose immediately if node A and node B both inserted an auto-incrementing key on the same table. The advantages of master-master replication over the traditional master-slave replication are that you don't have to modify your applications to make write accesses only to the master, and that it is easier to provide high-availability because if the master fails, you still have the other master.
Read more...Sample Configuration of DRBD On CentOS 4.5
Sample Configuration of DRBD On CentOS 4.5
DRBD is an abbreviation of Distributed Replicated Block Device. DRBD is a block device which is designed to build high-availability clusters. This is done by mirroring a whole block device via (a dedicated) network. You could see it as a network RAID1.
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