红帽全球峰会3.5. Creating a high availability cluster with multiple links
You create a Red Hat High Availability cluster with multiple links by specifying all of the links for each node with the pcs cluster setup command.
The format for the basic command to create a two-node cluster with two links is as follows.
pcs cluster setup pass:quotes[cluster_name] pass:quotes[node1_name] addr=pass:quotes[node1_link0_address] addr=pass:quotes[node1_link1_address] pass:quotes[node2_name] addr=pass:quotes[node2_link0_address] addr=pass:quotes[node2_link1_address]
For the full syntax of this command, see the pcs(8) man page on your system.
When creating a cluster with multiple links, you take the following caveats into account.
-
The order of the
addr=addressparameters is important. The first address specified after a node name is forlink0, the second one forlink1, and so forth. -
By default, if
link_priorityis not specified for a link, the link’s priority is equal to the link number. The link priorities are then 0, 1, 2, 3, and so forth, according to the order specified, with 0 being the highest link priority. -
The default link mode is
passive, meaning the active link with the lowest-numbered link priority is used. -
With the default values of
link_modeandlink_priority, the first link specified will be used as the highest priority link, and if that link fails the next link specified will be used. -
It is possible to specify up to eight links using the
knettransport protocol, which is the default transport protocol. -
All nodes must have the same number of
addr=parameters. -
It is possible to add, remove, and change links in an existing cluster using the
pcs cluster link add, thepcs cluster link remove, thepcs cluster link delete, and thepcs cluster link updatecommands. - As with single-link clusters, do not mix IPv4 and IPv6 addresses in one link, although you can have one link running IPv4 and the other running IPv6.
- As with single-link clusters, you can specify addresses as IP addresses or as names as long as the names resolve to IPv4 or IPv6 addresses for which IPv4 and IPv6 addresses are not mixed in one link.
The following example creates a two-node cluster named my_twolink_cluster with two nodes, rh80-node1 and rh80-node2. rh80-node1 has two interfaces, IP address 192.168.122.201 as link0 and 192.168.123.201 as link1. rh80-node2 has two interfaces, IP address 192.168.122.202 as link0 and 192.168.123.202 as link1.
# pcs cluster setup my_twolink_cluster rh80-node1 addr=192.168.122.201 addr=192.168.123.201 rh80-node2 addr=192.168.122.202 addr=192.168.123.202
To set a link priority to a different value than the default value, which is the link number, you can set the link priority with the link_priority option of the pcs cluster setup command. Each of the following two example commands creates a two-node cluster with two interfaces where the first link, link 0, has a link priority of 1 and the second link, link 1, has a link priority of 0. Link 1 will be used first and link 0 will serve as the failover link. Since link mode is not specified, it defaults to passive.
These two commands are equivalent. If you do not specify a link number following the link keyword, the pcs interface automatically adds a link number, starting with the lowest unused link number.
# pcs cluster setup my_twolink_cluster rh80-node1 addr=192.168.122.201 addr=192.168.123.201 rh80-node2 addr=192.168.122.202 addr=192.168.123.202 transport knet link link_priority=1 link link_priority=0
# pcs cluster setup my_twolink_cluster rh80-node1 addr=192.168.122.201 addr=192.168.123.201 rh80-node2 addr=192.168.122.202 addr=192.168.123.202 transport knet link linknumber=1 link_priority=0 link link_priority=1
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