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linux系统与进程文件打开数设置
source link: https://baorongquan.github.io/2019/08/08/linux%E7%B3%BB%E7%BB%9F%E4%B8%8E%E8%BF%9B%E7%A8%8B%E6%96%87%E4%BB%B6%E6%89%93%E5%BC%80%E6%95%B0%E8%AE%BE%E7%BD%AE/
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linux系统与进程文件打开数设置
场景是这样的：小伙伴在mongodb主备环境把备机停了一段时间后重新启动，mongodb主机在同步数据的过程中出现”too many open files error”, 在网上查到的说可以通过设置linux系统文件打开数来解决(服务器是Ubuntu),
然后开始一顿操作修改 /etc/security/limits.conf 进行设置
vi /etc/security/limits.conf 添加以下内容
* soft nproc 65533
* hard nproc 65533
* soft nofile 65533
* hard nofile 65533
root soft nproc 65533
root hard nproc 65533
root soft nofile 65533
root hard nofile 65533
重启后 ulimit -a 查看系统文件打开数已修改。但是查看mongodb进程限制仍未改变
cat /proc/pid/limits // pid 为mongod的进程id
登陆mongo通过,查看mongo连接数仍未改变。
db.runCommand({serverStatus:1}).connections
最后在stackoverflow 找到答案, 修改/etc/systemd/user.conf 以及 /etc/systemd/system.conf
添加以下内容
DefaultLimitNOFILE=65535
然后reboot重启后再看已生效
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