☰

为什么CentOS 6.10下系统启动时最大打开文件数是1024？

tag-icon • tag-icon linux centos-6
为什么CentOS 6.10下系统启动时最大打开文件数是1024？

我已经修改了/etc/security/limit.conf：

*  hard  nofile  1000000
*  soft  nofile  1000000

以及这个文件/etc/security/limits.d/90-nproc.conf

*          soft    nproc     unlimited
root       soft    nproc     unlimited

并重新启动系统。以下是输出ulimit -a：

core file size          (blocks, -c) 0
data seg size           (kbytes, -d) unlimited
scheduling priority             (-e) 0
file size               (blocks, -f) unlimited
pending signals                 (-i) 30967
max locked memory       (kbytes, -l) 64
max memory size         (kbytes, -m) unlimited
open files                      (-n) 1000000
pipe size            (512 bytes, -p) 8
POSIX message queues     (bytes, -q) 819200
real-time priority              (-r) 0
stack size              (kbytes, -s) 10240
cpu time               (seconds, -t) unlimited
max user processes              (-u) 30967
virtual memory          (kbytes, -v) unlimited
file locks                      (-x) unlimited

但是我的程序启动后rc.local，最大文件限制仍然是1024个：

以下是输出cat /proc/1695/limits：

Limit                     Soft Limit           Hard Limit           Units     
Max cpu time              unlimited            unlimited            seconds   
Max file size             unlimited            unlimited            bytes     
Max data size             unlimited            unlimited            bytes     
Max stack size            10485760             unlimited            bytes     
Max core file size        0                    unlimited            bytes     
Max resident set          unlimited            unlimited            bytes     
Max processes             30967                30967                processes 
Max open files            1024                 4096                 files     
Max locked memory         65536                65536                bytes     
Max address space         unlimited            unlimited            bytes     
Max file locks            unlimited            unlimited            locks     
Max pending signals       30967                30967                signals   
Max msgqueue size         819200               819200               bytes     
Max nice priority         0                    0                    
Max realtime priority     0                    0                    
Max realtime timeout      unlimited            unlimited            us

这是什么原因？我在命令行启动程序时没有这样的限制。

答案1

我没有通过系统层面解决，而是通过我的golang程序解决的。

    var rLimit syscall.Rlimit
    err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &rLimit)
    if err != nil {
        log.Fatal("1Error Getting Rlimit ", err)
    }
    log.Infof("Current Rlimit:%+v", rLimit)
    rLimit.Max = 1000000
    rLimit.Cur = 1000000
    err = syscall.Setrlimit(syscall.RLIMIT_NOFILE, &rLimit)
    if err != nil {
        log.Fatal("Error Setting Rlimit ", err)
    }
    err = syscall.Getrlimit(syscall.RLIMIT_NOFILE, &rLimit)
    if err != nil {
        log.Fatal("2Error Getting Rlimit ", err)
    }
    log.Info("Rlimit Final", rLimit)

相关内容