1.直接登陆Oracle用户如下报错,从一下报错信息可以得知，open file修改没有权限，也就是nofile参数设置有问题
正在进行认证,请稍后 ...... Using username "oracle". Last login: Wed Mar 9 09:25:23 2022 from xx.xx.xx.xx stty erase ^H -bash: ulimit: open files: cannot modify limit: Operation not permitted [oracle@xxx~]$ ulimit -u -n max user processes (-u) 65536 open files (-n) 1024
2.从以上报错马上想到可能是/etc/profile中设置的参数要比/etc/security/limits.conf参数文件中设置的要大导致的报错
if [ $USER = "oracle" ] || [ $USER = "grid" ]; then if [ $SHELL = "/bin/ksh" ]; then ulimit -p 16384 ulimit -n 65536 else ulimit -u 16384 -n 65536 fi umask 022 fi
grid soft nproc 65536 grid hard nproc 65536 grid soft nofile 65536 grid hard nofile 65536 grid soft stcak 10240 grid hard stcak 10240 oracle soft nproc 65536 oracle hard nproc 65536 oracle soft nofile 65536 oracle hard nofile 65536 oracle soft stack 10240 oracle hard stack 10240 oracle soft memlock -1 oracle hard memlock -1 grid soft memlock -1 grid hard memlock -1
切换到oracle用户查看资源限制，这里发现参数设置正常，那么为什么会出现此类问题呢？
这里是因为UsePam参数未打开，导致的问题
[root@xxx~]# su - oracle [oracle@xxx~]$ ulimit -u -n max user processes (-u) 65536 open files (-n) 65536
3.问题解决
修改/etc/ssh/sshd_config配置文件中，我们需要体添加如下配置.
UsePAM yes
重启sshd服务
--此时发现了如下报错，提示不支持UsePam，这里是因为没有安装openssh，重新安装即可
[root@xxx~]# service sshd restart Stopping sshd: [ OK ] Starting sshd:/etc/ssh/sshd_config line 82: Unsupported option UsePAM [ OK ]
安装openssh并重启sshd服务
[root@xxx~]# rpm -qa | grep openssh [root@xxx~]# yum -y install openssh-server Loaded plugins: fastestmirror, refresh-packagekit, security Setting up Install Process Determining fastest mirrors base | 2.9 kB 00:00 epel | 2.9 kB 00:00 epel/primary_db | 6.0 MB 00:00 extras | 2.9 kB 00:00 extras/primary_db | 27 kB 00:00 updates | 2.9 kB 00:00 updates/primary_db | 967 kB 00:00 Resolving Dependencies --> Running transaction check ---> Package openssh-server.x86_64 0:5.3p1-124.el6_10 will be installed --> Processing Dependency: openssh = 5.3p1-124.el6_10 for package: openssh-server-5.3p1-124.el6_10.x86_64 --> Running transaction check ---> Package openssh.x86_64 0:5.3p1-124.el6_10 will be installed --> Finished Dependency Resolution Dependencies Resolved =================================================================================================================================================================== Package Arch Version Repository Size =================================================================================================================================================================== Installing: openssh-server x86_64 5.3p1-124.el6_10 updates 330 k Installing for dependencies: openssh x86_64 5.3p1-124.el6_10 updates 278 k Transaction Summary =================================================================================================================================================================== Install 2 Package(s) Total download size: 607 k Installed size: 1.4 M Downloading Packages: (1/2): openssh-5.3p1-124.el6_10.x86_64.rpm | 278 kB 00:00 (2/2): openssh-server-5.3p1-124.el6_10.x86_64.rpm | 330 kB 00:00 ------------------------------------------------------------------------------------------------------------------------------------------------------------------- Total 2.5 MB/s | 607 kB 00:00 Running rpm_check_debug Running Transaction Test Transaction Test Succeeded Running Transaction Warning: RPMDB altered outside of yum. ** Found 1 pre-existing rpmdb problem(s), 'yum check' output follows: python-meh-0.12.1-3.el6.noarch has missing requires of openssh-clients Installing : openssh-5.3p1-124.el6_10.x86_64 1/2 warning: /etc/ssh/moduli created as /etc/ssh/moduli.rpmnew Installing : openssh-server-5.3p1-124.el6_10.x86_64 2/2 warning: /etc/ssh/sshd_config created as /etc/ssh/sshd_config.rpmnew Verifying : openssh-5.3p1-124.el6_10.x86_64 1/2 Verifying : openssh-server-5.3p1-124.el6_10.x86_64 2/2 Installed: openssh-server.x86_64 0:5.3p1-124.el6_10 Dependency Installed: openssh.x86_64 0:5.3p1-124.el6_10 Complete! [root@hrdb2 ~]# service sshd restart Stopping sshd: [ OK ] Starting sshd: [ OK ]
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