在limit.conf配置文件中添加了如下配置
* soft nproc 65535 * hard nproc 65535 * soft nofile 131070 * hard nofile 131070
另启终端查看最大文件打开数ulimit -n仍然为1024
经过各种百度搜查，发现以前更新过openssl和openssh，导致/etc/pam.d/sshd模块丢失，当sshd_config设置UsePAM yes的时候，无法ssh，我们现在添加sshd配置
[root@k8s-master idcs]# cat /etc/pam.d/sshd #%PAM-1.0 auth required pam_sepermit.so auth substack password-auth auth include postlogin # Used with polkit to reauthorize users in remote sessions -auth optional pam_reauthorize.so prepare account required pam_nologin.so account include password-auth password include password-auth # pam_selinux.so close should be the first session rule session required pam_selinux.so close session required pam_loginuid.so # pam_selinux.so open should only be followed by sessions to be executed in the user context session required pam_selinux.so open env_params session required pam_namespace.so session optional pam_keyinit.so force revoke session include password-auth session include postlogin # Used with polkit to reauthorize users in remote sessions -session optional pam_reauthorize.so prepare
然后重启sshd并另启终端查看最大文件打开数（生效了）
[root@k8s-master idcs]# systemctl restart sshd [root@k8s-master idcs]# ulimit -n 131070
原文：https://www.cnblogs.com/cpw6/p/13186736.html