Head Node IPTables example to open port 1099 and save the rules.
Add rule
iptables -A INPUT -p tcp --dport 1099 -j ACCEPT
Add rule
iptables -A OUTPUT -p tcp --dport 1099 -j ACCEPT
Save Rules in the event of reboot
/sbin/service iptables save
Wednesday, 8 September 2010
Run a command on all nodes
This will run the cat command on all nodes and output the results on the head node and redirect the output to a file. This gives a list of hostnames and MAC addresses in a txt file.
[root@HOST~]#cluster-fork cat /etc/sysconfig/network-scripts/ifcfg-eth0:0 | egrep "compute|HWADDR" > HostHWaddr.txt
[root@HOST~]#cluster-fork cat /etc/sysconfig/network-scripts/ifcfg-eth0:0 | egrep "compute|HWADDR" > HostHWaddr.txt
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