• Linux Too many open files


    Linux Too many open files

    查看系统资源限制信息:

    sudo -s -u root -H id

    sudo -s lsof | awk '{ print $2 " " $1; }' | sort -rn | uniq -c | sort -rn | head -20

    sudo -s ulimit -Sn

    sudo -s ulimit -Hn

    sudo cat /proc/sys/fs/file-max

    sudo -s cat /etc/security/limits.conf

    最后当我们尝试$ cat /proc/<processId>/limits我们注意到“打开文件数”仍显示为4096,这是旧值; 虽然对于root来说它显示了更高的值。

    最后,我们可以通过修改 /etc/default/tomcat7 [或与您的进程相对应的任何其他文件]并添加以下行来解决此问题:

    ulimit -Hn 10000
    ulimit -Sn 10000
    

    无需重启系统; 只需重新启动进程,然后检查 cat /proc/<processId>/limits 

    在ubuntu 16.04下,tomcat的最大文件数受systemd限制,并自动设置为4096.您可以通过运行更改此值

    systemctl edit tomcat7
    

    添加以下行:

    [Service]
    LimitNOFILE=8192
    

    或者你可以自己创建配置:

    mkdir /etc/systemd/system/tomcat7.service.d/
    nano /etc/systemd/system/tomcat7.service.d/override.conf 
    

    之后重新加载tomcat:

    服务tomcat7重启

    并仔细检查是否正确设置了限制

    ps ax | grep tomcat
    cat /proc/<processId>/limits 

    1. 使用以下行修改/etc/systemd/user.conf和/etc/systemd/system.conf(这将负责图形登录):
    DefaultLimitNOFILE=65535

    2. 使用以下行修改/etc/security/limits.conf(这将负责非GUI登录):
    * hard nofile 65535
    * soft nofile 65535
    root hard nofile 65535
    root soft nofile 65535

    3. 可选操作,编辑 /etc/pam.d/common-session和/etc/pam.d/common-session-noninteractive 文件并添加以下行到最后:
    session required pam_limits.so

    4. 重新启动计算机以使更改生效。

    No need to change anything in the /etc/security/limits.conf file, it is ignored if you are using systemd.

    (reproducing a modified answer to another question on the network...)

    An alternative for those who prefer not to edit the default /etc/systemd/system.conf and /etc/systemd/user/conf files:

    1. create a new file /etc/systemd/system.conf.d/limits.conf with these contents:

      [Manager]
      DefaultLimitNOFILE=65535
      
    2. run systemctl daemon-reexec as root

    3. logout and login again

    4. check your new limit with ulimit -n.

    Refer to the systemd-system.conf manpage for details.

    System.IO.IOException: Too Many Open Files (Mono .NET on Ubuntu)

    sudo ps -waux | grep mono | grep -v grep | awk '{print $2}' | xargs kill -9

    export MONO_MANAGED_WATCHER=disabled

    ================ End

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  • 原文地址:https://www.cnblogs.com/lsgxeva/p/10972074.html
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