Installation guide

The High Availability Add-On supports both IPv4 and IPv6 Internet Protocols. Support of

IPv6 in the High Availability Add-On is new for Red Hat Enterprise Linux 6.

2.2. Compat ible Hardware

Before configuring Red Hat High Availability Add-On software, make sure that your cluster uses

appropriate hardware (for example, supported fence devices, storage devices, and Fibre Channel

switches). Refer to the Red Hat Hardware Catalog at https://hardware.redhat.com/ for the most current

hardware compatibility information.

2.3. Enabling IP Port s

Before deploying the Red Hat High Availability Add-On, you must enable certain IP ports on the

cluster nodes and on computers that run lu ci (the Co n g a user interface server). The following

sections identify the IP ports to be enabled:

Section 2.3.1, “Enabling IP Ports on Cluster Nodes”

Section 2.3.2, “ Enabling the IP Port for lu ci”

The following section provides the i ptables rules for enabling IP ports needed by the Red Hat High

Availability Add-On:

Section 2.3.3, “ Configuring the iptables Firewall to Allow Cluster Components”

2.3.1. Enabling IP Port s on Clust er Nodes

To allow the nodes in a cluster to communicate with each other, you must enable the IP ports

assigned to certain Red Hat High Availability Add-On components. Table 2.1, “Enabled IP Ports on

Red Hat High Availability Add-On Nodes” lists the IP port numbers, their respective protocols, and the

components to which the port numbers are assigned. At each cluster node, enable IP ports for

incoming traffic according to Table 2.1, “Enabled IP Ports on Red Hat High Availability Add-On

Nodes” . You can use system-co nfi g -fi rewal l to enable the IP ports.

T ab le 2.1. En ab led IP Po rt s o n Red Hat Hig h Availab ilit y Add - O n No d es

IP Po rt N u mb er Pro t o co l Co mpo n en t

5404, 5405 UDP co ro sync/cman (Cluster Manager)

11111 TCP ri cci (propagates updated cluster information)

21064 TCP d l m (Distributed Lock Manager)

16851 TCP mo d cl usterd

2.3.2. Enabling t he IP Port for luci

To allow client computers to communicate with a computer that runs lu ci (the Co n g a user interface

server), you must enable the IP port assigned to lu ci. At each computer that runs lu ci, enable the IP

port according to Table 2.2, “ Enabled IP Port on a Computer That Runs luci” .

Note

If a cluster node is running lu ci, port 11111 should already have been enabled.

Red Hat Ent erprise Linux 6 Clust er Administ rat ion