Apple Mac OS X Server (version 10.2.3 or later) Uživatelský manuál stáhnout pdf (Strana 609)

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Tools for Advanced Administrators 609

Enabling IP Failover

You enable IP failover by adding command lines to the ﬁle /etc/hostconﬁg on the primary

and the secondary server. Be sure to enter these lines exactly as shown with regard to spaces

and punctuation marks.

To enable IP failover:

1 At the primary server, add the following line to /etc/hostconﬁg:

FAILOVER_BCAST_IPS=”10.0.0.255 100.0.255.255”

Substitute the broadcast addresses used on your server for the public and private networks.

This tells the server to send broadcast messages over relevant network interfaces that the

server at those IP addresses is functioning.

2 Restart the primary server so that your changes can take effect.

3 Disconnect the primary server from both the public and private networks.

4 At the secondary server, add the following lines to /etc/hostconﬁg:

FAILOVER_PEER_IP=”10.0.0.1”

FAILOVER_PEER_IP_PAIRS=”en0:100.0.0.10”

FAILOVER_EMAIL_RECIPIENT=”[email protected]”

In the ﬁrst line substitute the IP address of the primary server on the private network.

In the second line enter the local network interface that should adopt the primary server’s

public IP address, a colon, then the primary server’s public IP address.

(Optional) In the third line, enter the email address for notiﬁcation messages regarding the

primary server status. If this line is omitted, email notiﬁcations are sent to the root account

on the local machine.

5 If you wish to receive email notiﬁcations, verify that MailServer is enabled in your /etc/

hostconﬁg ﬁle. If the entry reads:

MAILSERVER=-NO-

Change to:

MAILSERVER=-YES-

6 Restart the secondary server so that your changes can take effect and allow the secondary

server to acquire the primary’s public IP address.

Important Before enabling IP Failover, verify on both servers that the port used for the

public network appears at the top of the Network Port Conﬁgurations list in the Network

pane of System Preferences. Also verify that the port used for the private network contains

no DNS conﬁguration information. This ensures DNS lookups function properly.

LL0395.Book Page 609 Wednesday, November 20, 2002 11:44 AM

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