Comprehensive use of GNULinux system variables (sysctl configuration command)

Comprehensive use of GNULinux system variables (sysctl configuration command)
View the values of all kernel variables

Sysctl-

How to view the value of a system variable 1), cat/proc/sys/net/ipv4/ip_local_port_range

32768 61000

2) sysctl-a | grep ip_local_port_range

Net. ipv4.ip _ local_port_range = 32768 61000

Modification Method: 1) echo "1024 65535">/proc/sys/net/ipv4/ip_local_port_range2), and perform the following settings in/etc/sysctl. conf:

Net. ipv4.ip _ local_port_range = 1024 65535
Run sysctl-p to apply these settings;

3) directly use commands to Optimize System Variables

Sysctl-w net. ipv4.ip _ local_port_range = 1024 65535

In the above 2nd methods, many people may. ipv4.ip _ local_port_range and so on. the separated variables do not know how to do this. In fact, this is written as a hierarchical representation of the system variables under the/proc/sys/directory; for example, when cat/proc/sys/net/ipv4/ip_local_port_range is used to view system variables, the full path is used to view the values;