在 CentOS 7 上為 systemd 啟動的程序增加 nproc

我已經成功地增加了本地使用者的 nofile 和 nproc 值，但是我找不到 systemd 啟動的程序的合適解決方案。將 max_open_files 添加到 MariaDB 配置沒有幫助。su - mysql手動更改限制也不起作用（此帳戶目前不可用）。

/etc/security/limits.conf

* soft nofile 102400
* hard nofile 102400
* soft nproc 10240
* hard nproc 10240

/etc/security/limits.d/20-nproc.conf（目錄中沒有其他文件）

* soft nofile 102400
* hard nofile 102400
* soft nproc 10240
* hard nproc 10240

/etc/sysctl.conf

fs.file-max = 2097152

/etc/pam.d/system-auth

#%PAM-1.0
# This file is auto-generated.
# User changes will be destroyed the next time authconfig is run.
auth        required      pam_env.so
auth        sufficient    pam_unix.so nullok try_first_pass
auth        requisite     pam_succeed_if.so uid >= 1000 quiet_success
auth        required      pam_deny.so

account     required      pam_unix.so
account     sufficient    pam_localuser.so
account     sufficient    pam_succeed_if.so uid < 1000 quiet
account     required      pam_permit.so

password    requisite     pam_pwquality.so try_first_pass local_users_only retry=3 authtok_type=
password    sufficient    pam_unix.so sha512 shadow nullok try_first_pass use_authtok
password    required      pam_deny.so

session     optional      pam_keyinit.so revoke
session     required      pam_limits.so
-session     optional      pam_systemd.so
session     [success=1 default=ignore] pam_succeed_if.so service in crond quiet use_uid
session     required      pam_unix.so

/etc/pam.d/systemd-user

#%PAM-1.0

# Used by systemd when launching systemd user instances.

account include system-auth
session include system-auth
auth required pam_deny.so
password required pam_deny.so

/var/log/mariadb/mariadb.log

[Warning] Changed limits: max_open_files: 1024  max_connections: 32  table_cache: 491

/proc/mysql_pid/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            8388608              unlimited            bytes
Max core file size        0                    unlimited            bytes
Max resident set          unlimited            unlimited            bytes
Max processes             30216                30216                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       30216                30216                signals
Max msgqueue size         819200               819200               bytes
Max nice priority         0                    0
Max realtime priority     0                    0
Max realtime timeout      unlimited            unlimited            us

有趣的是，不同的程序（使用者）有不同的最大打開文件數：

mysql - 1024 4096
apache - 1024 4096
postfix - 4096 4096

systemd完全忽略 /etc/security/limits*。如果您使用的 RPM 會在更新時自動壓縮其 systemd 服務文件，您需要送出 PR 要求他們將這些文件標記為“noreplace”

您需要更新 .service 文件 /usr/lib/systemd/system/<servicename>.service

[Unit]
Description=Some Daemon
After=syslog.target network.target

[Service]
Type=notify
LimitNOFILE=49152
ExecStart=/usr/sbin/somedaemon

[Install]
WantedBy=multi-user.target

ickill指出，您還可以通過將它們添加到/etc/systemd/system/<servicename>.d/override.conf

[Service]
LimitNOFILE=49152

這提供了系統特定設置的額外好處，這些設置不會在包更新時被覆蓋。

然後發出命令：systemctl daemon-reload

引用自：https://serverfault.com/questions/628610