You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
|
|
|
|
|
# **sysctl**
|
|
|
|
|
|
|
|
|
|
|
|
## 说明
|
|
|
|
|
|
|
|
|
|
|
|
**sysctl命令** 被用于在内核运行时动态地查看修改内核的运行参数，可用的内核参数在目录`/proc/sys`中。它包含一些TCP/ip堆栈和虚拟内存系统
|
|
|
|
|
|
的高级选项
|
|
|
|
|
|
|
|
|
|
|
|
## 选项
|
|
|
|
|
|
|
|
|
|
|
|
```markdown
|
|
|
|
|
|
-a, --all 显示当前所有可用的内核参数变量和值
|
|
|
|
|
|
-A alias of -a(但以表格方式显示)
|
|
|
|
|
|
-X alias of -a
|
|
|
|
|
|
--deprecated include deprecated parameters to listing
|
|
|
|
|
|
-b, --binary print value without new line
|
|
|
|
|
|
-e, --ignore ignore unknown variables errors
|
|
|
|
|
|
-N, --names print variable names without values
|
|
|
|
|
|
-n, --values print only values of a variables
|
|
|
|
|
|
-p, --load[=<file>] read values from file
|
|
|
|
|
|
-f alias of -p
|
|
|
|
|
|
--system read values from all system directories
|
|
|
|
|
|
-r, --pattern <expression> select setting that match expression
|
|
|
|
|
|
-q, --quiet do not echo variable set
|
|
|
|
|
|
-w, --write enable writing a value to variable;当改变sysctl设置时使用此项
|
|
|
|
|
|
-o does nothing
|
|
|
|
|
|
-x does nothing
|
|
|
|
|
|
-d alias of -h
|
|
|
|
|
|
|
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
|
|
## 实例
|
|
|
|
|
|
|
|
|
|
|
|
```bash
|
|
|
|
|
|
|
|
|
|
|
|
sysctl -a # 查看所有可读内核变量
|
|
|
|
|
|
sysctl net.nf_conntrack_max # 读取一个指定的变量，例如net.nf_conntrack_max
|
|
|
|
|
|
sysctl net.nf_conntrack_max=262144 # 要设置一个指定的变量，直接用variable=value,但并不是所有的变量都可以在这个模式下设定
|
|
|
|
|
|
|
|
|
|
|
|
```
|
