The procfs Interface
Another way to modify kernel parameters is to use the file system interface through procfs. The /proc file system (procfs) is a special file system. It is a virtual file system; it is not associated with a block device, but exists only in memory. The /proc/ directory shows a hierarchical view of the parameters. You can view the parameters by looking at the file's contents. The parameters can be modified by echoing the value in the file. However, changes made this way do not persist across machine reboots./proc is organized into the following directories: | /proc/bus | Bus-specific information | | /proc/driver | Driver-specific information | | /proc/fs | File system parameters | | /proc/irq | Masks for IRQ-to-CPU affinity | | /proc/net | Networking information | | /proc/scsi | SCSI-related information | | /proc/sys | Kernel parameters | | /proc/sys/fs | Generic file system data | | /proc/sys/kernel | General kernel parameters | | /proc/sys/vm | Memory management parameters | | /proc/sys/dev | Device-specific information | | /proc/sys/sunrpc | RPC information | | /proc/sys/net | Networking information | | /proc/sysvipc | System V IPC information | | /proc/tty | TTY driver information | | /proc/pid | Per-process information | Using procfs
The parameters can be viewed or changed by writing to the appropriate file in the /proc/ directory.For example, to view the current value of shmmax, enter the following:
$ cat /proc/sys/kernel/shmmax
Similarly, you can change the value of shmmax by entering this command:
$ echo "32" > /proc/sys/kernel/shmmax
Note that this change is temporary and does not persist across reboots. |
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