Ultra Monkey: Errata

Ultra Monkey: High Availability and Load Balancing Solution for Linux

Errata

Bugs Effecting The Current Release

Load Balanced HTTPS Servers
There is a bug in the version of ldirectord that ships with Ultra Monkey 1.0.2beta0 that causes the daemon to exit if an HTTPS server that is being monitored becomes unavailable.
Please upgrade to the updated heartbeat package[offline] that includes a patched ldirectord.
Ultra Monkey 1.0.2beta0[offline].

Bugs Effecting Previous Releases

High Capacity, Highly Available, Load Balanced Service: Network of Virtual Services
There is an error when describing the ipchins rules used to set up this service on the LVS server.
```
# Allow forwarding to Virtual Service Address                                   
ipchains -A forward -j ACCEPT -d 192.168.7.240
```
Should read
```
# Allow forwarding to Virtual Service Address
ipchains -A forward -j ACCEPT -d 192.168.6.240
```
That is 192.168.7.240 should be 192.168.6.240.
This effects pages in Ultra Monkey 1.0.0[offline] and 1.0.1[offline].
High Capacity, Highly Available, Load Balanced Service: Single Virtual Service
There is an error in the description of how to configure hidden interfaces. Due the the ordering of bootup under VA-Enhanced Red Hat 6.2, sysctl is called before interfaces are brought up. This means that entries in /etc/sysctl.conf that act on the loopback interface will not take effect and interfaceses will not be hidden on reboot as desired. To resolve this problem add the following to /etc/rc.d/rc.local
```
sysctl -p /etc/sysctl.conf
```
This effects pages in Ultra Monkey 1.0.0[offline] and 1.0.0[offline].
High Capacity, Highly Available, Load Balanced Service: Network of Virtual Services
There is an error in the description of how to configure the LVS Servers. In addition to the configuration information supplied the LVS Servers need to be configured to see the virtual addresses 192.168.0.0/24 as local as do the Real Servers. This can be done by making use of an IP alias on the loopback device. The file /etc/sysconfig/network-scripts/ifcfg-lo:0 configures this device and an example follows. Note that this is the same as the loopback interface configuration for the Real Servers:
```
DEVICE=lo:0
IPADDR=192.168.0.0
NETMASK=255.255.255.0
NETWORK=192.168.0.0
BROADCAST=192.168.0.255
ONBOOT=yes
NAME=loopback
```
To avoid unnecessary warnings you should ensure that the gateway device is set to the ethernet interface. The following line from /etc/sysconfig/network sets the gateway device to eth0
```
GATEWAYDEV=eth0
```
To bring up the IP alias the ifup command is used:
```
/sbin/ifup lo
```
You can verify that the interface came up using the ifconfig command:
```
/sbin/ifconfig
```
This effects pages in Ultra Monkey 1.0.0[offline] and 1.0.1[offline].

Copyright © 2000-2005, Horms
Last Updated: Sat Mar 4 18:34:06 2006 +1100

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