The tag has no wiki summary.

learn more… | top users | synonyms

0
votes
1answer
122 views

Which technique should be chosen for IP failover with manual control

I have the following setup, Linux stack, with front-end running nginx proxy and static assets and back-end running Ruby on Rails and MySQL in master-master replication: Primary site: front-end.a, ...
1
vote
1answer
89 views

Monitor a ucarp VIP using another interface

On Debian machines, I would like to setup a VIP between two nodes for a public IP, but I would like to avoid using three IP addresses to make ucarp communicate between the two nodes. Can I set it up ...
2
votes
0answers
311 views

Configure SSH while using UCARP for failover

I have SSH installed, and UCARP configured to fail over a virtual IP when one of the two boxes goes down. The problem that I'm having is when a VM is running, and the ucarp interface is active ...
0
votes
2answers
494 views

Ucarp start error on Centos 6 : “You must supply a valid host id”

I'm trying to get ucarp working on 2 Centos 6 servers running Apache. I've configured both /etc/sysconfig/carp/vip-001.conf and /etc/sysconfig/network-scripts/eth0 and eth0:0 as such on serv1: ...
0
votes
0answers
108 views

how to carp two interfaces on same node?

I have this CentOS machine with 2 interfaces. eth0--> br0 (.10) eth1--> br1 (.11) Although part of the same network, each interface is being fed from a different switch. I use each bridge in ...
4
votes
2answers
1k views

UCARP: prevent the original master from taking over the VIP when it comes back after failure?

Keepalived can do this by combining the nopreempt option and the BACKUP state on the both nodes: Prevent VRRP Master from becoming Master once it has failed Prevent master to fall back to master ...
0
votes
1answer
226 views

Network GURUs - IP failover combined with load-balancing… Is there such software? Is it possible?

I've been playing around with high-availability solutions for a few days and so far I find UCARP very useful for IP fail-overing. It's dead simple and does the job. I was thinking about taking it a ...
2
votes
1answer
5k views

How to make iptables ALLOW rule for multicast?

I have two servers that uses ucarp as failover. On each server eth1:1 is reserved for ucarp's keepalive connection. ucarp uses the destination IP as multicast address 224.0.0.18. On ucarp master ...
0
votes
1answer
287 views

Can the NIC ucarp uses be bridged?

I have setup ucarp failover using this howto, and it works great. # /etc/network/interfaces auto eth0 iface eth0 inet static address 10.200.0.102 netmask 255.255.255.0 ...
1
vote
3answers
2k views

ucarp: promote slave to master

I have got ucarp working on my two ubuntu servers. Apache, Postfix, Dovecot are working in HA mode so if one host goes down the other automatically takes over. My first problem is that I don't know ...
1
vote
3answers
4k views

How are you supposed to setup UCARP in CentOS?

I have UCARP working but the documentation is confusing and I've found at least 3 different ways suggested in blogs (these are old and don't all seem to work). I currently have ucarp- lines added to ...
1
vote
1answer
228 views

How to get UCARP to work over wireless?

I would like to get ucarp to work over a wireless (802.11g) interface, but the packages is never seen on the wired end. The setup looks like this: Box1 (10.0.0.11, wireless) -- AP -- (10.0.0.13, ...
2
votes
3answers
6k views

Multiple UCARP VIPs on single Interface with Debian/Ubuntu

The example ucarp config for a virtual IP for Debian/Ubuntu is in /usr/share/doc/ucarp/README.Debian and is as follows: The recommended method for configuring ucarp is via /etc/network/interfaces. ...