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cluster:102 [2011/06/29 11:08]
hmeij 		cluster:102 [2011/06/29 11:29]
hmeij
Line 11: Line 11:
  
 <code> <code>
 +
 [root@petaltail ~]# host flexstorage [root@petaltail ~]# host flexstorage
 flexstorage.wesleyan.edu has address 129.133.24.81 flexstorage.wesleyan.edu has address 129.133.24.81
 +
 [root@petaltail ~]# df -h /home/dlbgroup [root@petaltail ~]# df -h /home/dlbgroup
 Filesystem            Size  Used Avail Use% Mounted on Filesystem            Size  Used Avail Use% Mounted on
 flexstorage.wesleyan.edu:/share/dlbgroup flexstorage.wesleyan.edu:/share/dlbgroup
                      1000G  588G  413G  59% /home/dlbgroup                      1000G  588G  413G  59% /home/dlbgroup
 +
 +</code>
 +
 +Host petaltail has the following interfaces.  The file system in question is mounted on host petaltail as VLAN 1 can reach VLAN 24.
 +
 +<code>
 +
 +eth0      Link encap:Ethernet  HWaddr 00:18:8B:51:FA:42
 +          inet addr:192.168.1.217  Bcast:192.168.255.255  Mask:255.255.0.0
 +eth1      Link encap:Ethernet  HWaddr 00:18:8B:51:FA:44
 +          inet addr:10.10.100.217  Bcast:10.10.255.255  Mask:255.255.0.0
 +eth2      Link encap:Ethernet  HWaddr 00:15:17:80:8D:F2
 +          inet addr:129.133.1.225  Bcast:129.133.1.255  Mask:255.255.255.0
 +eth3      Link encap:Ethernet  HWaddr 00:15:17:80:8D:F3
 +          inet addr:192.168.2.2  Bcast:192.168.2.255  Mask:255.255.255.0
 +
 +</code>
 +
 +But a compute node on our cluster, for example node b1, has the following interfaces, all private
 +
 +<code>
 +
 +eth0      Link encap:Ethernet  HWaddr 00:13:D3:F2:C8:EC  
 +          inet addr:192.168.1.7  Bcast:192.168.255.255  Mask:255.255.0.0
 +eth1      Link encap:Ethernet  HWaddr 00:13:D3:F2:C8:ED  
 +          inet addr:10.10.100.7  Bcast:10.10.255.255  Mask:255.255.0.0
 +
 +</code>
 +
 +So in order to for the compute node b1 to reach the flexstorage server we need to use NAT rules and define a path/route.  First we start on petaltail and edit the iptables file and add a "nat filter" masquerade/post routing directives and in the "filter filter" set up a rule connecting eth1 and eth2.
 +
 +<code>
 +
 +*nat
 +# fss public to 10.10
 +-A POSTROUTING -o eth2 -j MASQUERADE
 +COMMIT
 +
 +*filter
 +# fss public via 10.10
 +-A FORWARD -i eth1 -o eth2 -m state --state RELATED,ESTABLISHED -j ACCEPT
 +...
 +COMMIT
 +
 +</code>
 +
 +Next, on the compute nodes we need to add routing path and then mount the file system (using an IP because there is no name resolving).  These commands are stuck in /etc/rc.local for persistence.
 +
 +<code>
 +
 +
  
 </code> </code>
cluster/102.txt ยท Last modified: 2020/08/24 07:19 by hmeij07

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