network probing.

[khilari]

I was working on service guard and i halted a node. When i restarted it using service guard manager it asked if i started it by cmrunnode command i will be prbing the network. What does that mean ?

[Chan 007 · Accepted solution]

Hi,

Probing is just verifying the connectivity of all other LAN (I mean clustered Node LANs)

Chan

[Steven E. Protter]

Shalom,

Serviceguard and most packages include network informaiton. Floating IP address, and such.

Probing the network is not nefarious, its necessary part of SG starting up the node.

Its not a security problem, nor does it threaten other hosts.

SEP

[John Bigg]

At some point in the past, Serviceguard was enhanced to do network probing at startup to ensure that the physical network matches that defined in the Serviceguard configuration. This is purely for your benefit and Serviceguard will start after issuing a warning if an anomoly is detected.

This is the message you will see from the command line:

cmruncl: Validating network configuration...

This option is on by default when cmruncl and cmrunnode are used and can be disabled with the -w none option:

-w none By default network probing is performed to check that
the network connectivity is the same as when the
cluster was configured. Any anomalies are reported
before the cluster daemons are started. The -w none
option disables this probing. The option should only be
used if this network configuration is known to be
correct from a recent check.

Serviceguard Manager also gives you the option to probe or not probe and passes this onto the command run when the cluster is started.

Probing normally takes little time and allows you to see any possible configuration or network problems in advance of any failures which may rely on network consistency.