Difference between revisions of "IPv6 Kernel: Bagaimana mengakses /proc-filesystem"
Onnowpurbo (talk | contribs) (New page: 11.1. How to access the /proc-filesystem 11.1.1. Using “cat” and “echo” Using “cat” and “echo” is the simplest way to access the /proc filesystem, but some requirements ar...) |
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11.1.1. Using “cat” and “echo” | 11.1.1. Using “cat” and “echo” | ||
| − | + | Menggunakan “cat” dan “echo” adalah cara yang paling sederhana untuk mengakses filesistem /proc, akan tetapi beberapa pra-syarat dibutuhkan agar itu bisa dilakukan, | |
| − | + | * Filesistem /proc harus di enable di kernel, oleh karenanya waktu compile harus di set agar | |
| − | CONFIG_PROC_FS=y | + | CONFIG_PROC_FS=y |
| − | + | * Filesistem /proc harus di mount sebelumnya, dapat di test menggunakan | |
| − | # mount | grep "type proc" | + | # mount | grep "type proc" |
| − | + | proc on /proc type proc (rw,noexec,nosuid,nodev) | |
| + | |||
| + | * Kita perlu ijin untuk read, dan kadang-kadang write (biasanya hanya root) ke filesistem /proc | ||
| + | |||
| + | Biasanya, hanya /proc/sys/* yang bisa di write, sementara lainnya biasanya readonly dan hanya bisa di baca informasinya saja. | ||
| − | |||
| − | |||
11.1.1.1. Retrieving a value | 11.1.1.1. Retrieving a value | ||
The value of an entry can be retrieved using “cat”: | The value of an entry can be retrieved using “cat”: | ||
| − | # cat /proc/sys/net/ipv6/conf/all/forwarding | + | # cat /proc/sys/net/ipv6/conf/all/forwarding |
| − | 0 | + | 0 |
11.1.1.2. Setting a value | 11.1.1.2. Setting a value | ||
| Line 27: | Line 29: | ||
A new value can be set (if entry is writable) using “echo”: | A new value can be set (if entry is writable) using “echo”: | ||
| − | # echo "1" >/proc/sys/net/ipv6/conf/all/forwarding | + | # echo "1" >/proc/sys/net/ipv6/conf/all/forwarding |
11.1.2. Using “sysctl” | 11.1.2. Using “sysctl” | ||
| Line 37: | Line 39: | ||
The sysctl-interface had to be enabled in kernel, means on compiling following switch has to be set | The sysctl-interface had to be enabled in kernel, means on compiling following switch has to be set | ||
| − | CONFIG_SYSCTL=y | + | CONFIG_SYSCTL=y |
11.1.2.1. Retrieving a value | 11.1.2.1. Retrieving a value | ||
| Line 43: | Line 45: | ||
The value of an entry can be retrieved now: | The value of an entry can be retrieved now: | ||
| − | # sysctl net.ipv6.conf.all.forwarding | + | # sysctl net.ipv6.conf.all.forwarding |
| − | net.ipv6.conf.all.forwarding = 0 | + | net.ipv6.conf.all.forwarding = 0 |
11.1.2.2. Setting a value | 11.1.2.2. Setting a value | ||
| Line 50: | Line 52: | ||
A new value can be set (if entry is writable): | A new value can be set (if entry is writable): | ||
| − | # sysctl -w net.ipv6.conf.all.forwarding=1 | + | # sysctl -w net.ipv6.conf.all.forwarding=1 |
| − | net.ipv6.conf.all.forwarding = 1 | + | net.ipv6.conf.all.forwarding = 1 |
Note: Don't use spaces around the “=” on setting values. Also on multiple values per line, quote them like e.g. | Note: Don't use spaces around the “=” on setting values. Also on multiple values per line, quote them like e.g. | ||
| − | # sysctl -w net.ipv4.ip_local_port_range="32768 61000" | + | # sysctl -w net.ipv4.ip_local_port_range="32768 61000" |
| − | net.ipv4.ip_local_port_range = 32768 61000 | + | net.ipv4.ip_local_port_range = 32768 61000 |
11.1.2.3. Additionals | 11.1.2.3. Additionals | ||
Revision as of 11:18, 27 May 2013
11.1. How to access the /proc-filesystem 11.1.1. Using “cat” and “echo”
Menggunakan “cat” dan “echo” adalah cara yang paling sederhana untuk mengakses filesistem /proc, akan tetapi beberapa pra-syarat dibutuhkan agar itu bisa dilakukan,
- Filesistem /proc harus di enable di kernel, oleh karenanya waktu compile harus di set agar
CONFIG_PROC_FS=y
- Filesistem /proc harus di mount sebelumnya, dapat di test menggunakan
# mount | grep "type proc" proc on /proc type proc (rw,noexec,nosuid,nodev)
- Kita perlu ijin untuk read, dan kadang-kadang write (biasanya hanya root) ke filesistem /proc
Biasanya, hanya /proc/sys/* yang bisa di write, sementara lainnya biasanya readonly dan hanya bisa di baca informasinya saja.
11.1.1.1. Retrieving a value
The value of an entry can be retrieved using “cat”:
# cat /proc/sys/net/ipv6/conf/all/forwarding 0
11.1.1.2. Setting a value
A new value can be set (if entry is writable) using “echo”:
# echo "1" >/proc/sys/net/ipv6/conf/all/forwarding
11.1.2. Using “sysctl”
Using the “sysctl” program to access the kernel switches is a modern method today. You can use it also, if the /proc-filesystem isn't mounted. But you have only access to /proc/sys/*!
The program “sysctl” is included in package “procps” (on Red Hat Linux systems).
The sysctl-interface had to be enabled in kernel, means on compiling following switch has to be set
CONFIG_SYSCTL=y
11.1.2.1. Retrieving a value
The value of an entry can be retrieved now:
# sysctl net.ipv6.conf.all.forwarding net.ipv6.conf.all.forwarding = 0
11.1.2.2. Setting a value
A new value can be set (if entry is writable):
# sysctl -w net.ipv6.conf.all.forwarding=1 net.ipv6.conf.all.forwarding = 1
Note: Don't use spaces around the “=” on setting values. Also on multiple values per line, quote them like e.g.
# sysctl -w net.ipv4.ip_local_port_range="32768 61000" net.ipv4.ip_local_port_range = 32768 61000
11.1.2.3. Additionals
Note: There are sysctl versions in the wild which displaying “/” instead of the “.”
For more details take a look into sysctl's manpage.
Hint: for digging fast into the settings, use the option “-a” (display all entries) in conjunction with “grep”. 11.1.3. Values found in /proc-filesystems
There are several formats seen in /proc-filesystem:
BOOLEAN: simple a “0” (false) or a “1” (true)
INTEGER: an integer value, can be unsigned, too
more sophisticated lines with several values: sometimes a header line is displayed also, if not, have a look into the kernel source to retrieve information about the meaning of each value...