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centos_hortonworks [2016/04/20 09:21] steve |
centos_hortonworks [2016/04/20 09:28] steve |
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| At the boot menu, hit Tab, and add ''text'' to the kernel options. | At the boot menu, hit Tab, and add ''text'' to the kernel options. | ||
| - | ** Disk partitioning ** | + | ** Disk partitioning and filesystems ** |
| Hadoop comes with some recommendations for setting up the filesystem | Hadoop comes with some recommendations for setting up the filesystem | ||
| - | * Don't use LVM | + | * Don't use LVM to manage partitions |
| - | * No swap partition or disable it in ''sysctl.conf'' | + | * Either do not install swap partition or set ''vm.swappiness'' to 0 in ''sysctl.conf'' |
| * Set the ''noatime'' flag for the partitions | * Set the ''noatime'' flag for the partitions | ||
| * Use ext3 or ext4 as the filesystem type | * Use ext3 or ext4 as the filesystem type | ||
| - | * Disable root reserved amount | + | * Disable root reserved amount |
| - | Since HDFS works across partitions, I keep it simple and have only one partition. | + | Using the text installer, your partitions are set up automatically. It will install a swap partition, and a separate one for the boot loader. |
| You'll only get an option to partition the drives through the GUI install. So in these cases of a text one, it'll auto-format, use LVM, and create an ext4 filesystem for root. | You'll only get an option to partition the drives through the GUI install. So in these cases of a text one, it'll auto-format, use LVM, and create an ext4 filesystem for root. | ||
| + | |||
| + | Set ''vm.swappiness'' to 0 in ''/etc/sysctl.conf'', and apply it to the running system. This will let the kernel use swap only if something is going to OOM. | ||
| ** DHCP request ** | ** DHCP request ** | ||
