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Excerpt: During the ip migration or swapping one of the common issue the admin face with the Data Center(DC) is ARP caching on the router. The router is usually setup to clear the ARP cache after long hours. So we may need to contact the Data center network admin to clear the arp cache or have to wait for until it clears itself. On heavy loaded web servers this down time may cause money loss. We can use arping or send_arp tools to update the roter ARP cache from the new server.   For example if your swapped ip address is 192.168.1.2 ,….

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Excerpt: The above short tutorial shows how to rename the default Network Interface Cards (NIC) label with your own names instead of eth0, eth1..etc. This may be useful for those who have multi number of NIC cards listening on different networks. Setting up your own names may helpful for easy identification.   Renaming EthX   Though various tutorials are available online, i found the following steps are easier and error free and also works well in various Linux Distributions. The following steps how to rename the eth0 using the nameif command (comes with net-tools package, you can install it using yum install net-tools) and how….

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Excerpt: Many time we may encounter with RAM overloads filling all the RAM memory and then using the swap memory(partition). Once you fixed the RAM usage problem and if you want to clear the cache on SWAP memory(disk). Just follow the simple steps.   Find out the exact swap partition on the server by using   # cat /etc/fstab   Search for the lines swap    defaults        0 0 the first right colum shows you the exact swap partiton (In the below example /dev/sda2 is the swap partiton):   /dev/sda2  swap  swap defaults  0 0   And if you are on LVM it may looks similar to (/dev/VolGroup00/LogVol01 is the swap volume….