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  • Ubuntu /etc/security/limits.conf 不生效问题

    一、问题描述

    修改 /etc/security/limits.conf ,重启之后不生效

    内容如下:

    * soft nofile 2048576
    * hard nofile 2048576
    root soft nofile 2048576
    root hard nofile 2048576
    * soft nproc 80480
    * hard nproc 80960
    root soft nproc 80480
    root hard nproc 80960

    二、解决问题

    根据网上资料的说法有几种

    1. 修改 /etc/ssh/sshd_config

    开启这2项

    UsePAM yes
    UseLogin yes

    2. 以下几个文件

    /etc/pam.d/login
    /etc/pam.d/su
    /etc/pam.d/sshd

    确保开启了pam_limits.so

    session    required   pam_limits.so

    3. 重启系统

    注意:修改了/etc/security/limits.conf ,必须要重启,才能生效。

    以上几个,都测试了一下,open files没有生效!max user processes倒是生效了

    root@ubuntu:~# 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) 7832 max locked memory (kbytes, -l) 64 max memory size (kbytes, -m) unlimited open files (-n) 1024 pipe size (512 bytes, -p) 8 POSIX message queues (bytes, -q) 819200 real-time priority (-r) 0 stack size (kbytes, -s) 8192 cpu time (seconds, -t) unlimited max user processes (-u) 80480 virtual memory (kbytes, -v) unlimited file locks (-x) unlimited

    最后终于找到原因了,是因为 内核参数没有配置

    # 编辑配置文件
    vi /etc/sysctl.conf
     
    fs.nr_open = 10000000
     
    # 重新加载
    sysctl -p

    再次重启,效果如下:

    root@ubuntu:~# 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) 31392 max locked memory (kbytes, -l) 64 max memory size (kbytes, -m) unlimited open files (-n) 2048576 pipe size (512 bytes, -p) 8 POSIX message queues (bytes, -q) 819200 real-time priority (-r) 0 stack size (kbytes, -s) 8192 cpu time (seconds, -t) unlimited max user processes (-u) 80480 virtual memory (kbytes, -v) unlimited file locks (-x) unlimited

    本文参考链接:

    https://blog.51cto.com/jonyisme/1919075

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  • 原文地址:https://www.cnblogs.com/xiao987334176/p/11008812.html
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