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This article mainly explains "how to modify Linux kernel module parameters", interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Let's let Xiaobian take you to learn "How to modify Linux kernel module parameters"!

Kernel module is a unique mechanism in Linux operating system. Modular technology can keep the system kernel to a minimum, while ensuring the scalability and maintainability of the kernel. Modular design allows us to load modules into the kernel when needed, realizing dynamic kernel adjustment.

Kernel module storage location

Linux kernel module files are usually named in such a way that kernel modules for Centos 6.3 are stored centrally in the/lib/modules/uname -r/directory.

View loaded system modules

The lsmod command is used to display the current Linux kernel module status. Without any parameters, it displays all currently loaded kernel modules. The output three columns of information are module name, occupied memory size and whether it is in use. If the third column is 0, the module can be unloaded at any time. If it is not 0, modprobe cannot delete the module.

[root@centos6 ~]# lsmodModule Size Used bybridge 79950 0stp 2173 1 bridgellc 5642 2 bridge,stpfuse 66891 2autofs4 27212 3sunrpc 263516 1ipt_REJECT 2351 2nf_conntrack_ipv4 9606 1nf_defrag_ipv4 1483 1 nf_conntrack_ipv4iptable_filter 2793 1ip_tables 17831 1 iptable_filter Loading and unloading the system kernel

The modprobe command dynamically loads and unloads kernel modules as follows:

[root@centos6 ~]# modprobe ip_vs #dynamically load ip_vs module [root@centos6 ~]# lsmod| grep ip_vs #check whether the module is loaded successfully [root@centos6 ~]# modprobe -r ip_vs #Dynamically uninstall ip_vs module

The modinfo command can also view kernel module information:

[root@centos6 ~]# modinfo ip_vs modify kernel parameters temporarily adjust kernel parameters

Linux system parameters will be written to system memory along with the system startup. We can directly modify a large number of files in the/proc directory to adjust kernel parameters, and this adjustment will take effect immediately. Here are a few examples:

Turn on kernel routing forwarding (switch set by 0 or 1):

[root@centos6 ~]# echo "1" > /proc/sys/net/ipv4/ip_forward

Enable the function of prohibiting other hosts from ping this machine:

[root@centos6 ~]# echo "1" > /proc/sys/net/ipv4/icmp_echo_ignore_all

Adjust the total number of files that can be opened by all processes:

[root@centos6 ~]# echo "108248" >/proc/sys/fs/file-max Permanently adjust kernel parameters

The above method of directly modifying/proc related files is no longer valid after system restart. If you want to set parameters to take effect permanently, you can modify the/etc/sysctl.conf file. You can use Vim to modify the file:

[root@centos6 ~]# vim /etc/sysctl.confnet.ipv4.ip_forward = 1net.ipv4.icmp_echo_ignore_all = 1fs.file-max = 108248

Note: Parameters modified via the sysctl.conf file do not take effect immediately and need to be set to take effect immediately using the sysctl -p command.

At this point, I believe everyone has a deeper understanding of "how to modify Linux kernel module parameters," so let's actually operate it! Here is the website, more related content can enter the relevant channels for inquiry, pay attention to us, continue to learn!

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