http://www.jackxiang.com/index.php zh-cn http://www.jackxiang.com/post// jack <xdy108@126.com> Wed, 16 May 2018 14:51:12 +0000 http://www.jackxiang.com/post// 解决办法如下：
cat  /etc/profile.d/ssh-agent.sh  
#!/bin/sh if [ -f ~/.agent.env ]; then         . ~/.agent.env >/dev/null         if ! kill -0 $SSH_AGENT_PID >/dev/null 2>&1; then                 echo "Stale agent file found. Spawning new agent..."                 eval `ssh-agent |tee ~/.agent.env`                 ssh-add         fi else         echo "Starting ssh-agent..."         eval `ssh-agent |tee ~/.agent.env`         ssh-add fi
运行：
[root@localhost ~]# sh  /etc/profile.d/ssh-agent.sh  
Starting ssh-agent...
Agent pid 3625
[root@localhost ~]# ps -ef|grep 3625
root      3625     1  0 22:57 ?        00:00:00 ssh-agent
root      3647  3325  0 22:57 pts/2    00:00:00 grep --color=auto 3625

后面再多个SSH，只有四个ssh-agent进程:
ps -ef|grep ssh-agent            
root      3625     1  0 22:57 ?        00:00:00 ssh-agent
root      2442     1  0 22:54 ?        00:00:00 /usr/bin/ssh-agent -s
root      2785     1  0 22:55 ?        00:00:00 /usr/bin/ssh-agent -s
root      3131     1  0 22:56 ?        00:00:00 /usr/bin/ssh-agent -s
root      3527     1  0 22:57 ?        00:00:00 /usr/bin/ssh-agent -s
root      3878     1  0 22:58 ?        00:00:00 /usr/bin/ssh-agent -s

cat ~/.agent.env
SSH_AUTH_SOCK=/tmp/ssh-X1RtYLOVI2iq/agent.3623; export SSH_AUTH_SOCK;
SSH_AGENT_PID=3625; export SSH_AGENT_PID;
echo Agent pid 3625;

感觉进程数还是变多，无鸟用，于是干掉这个SSH-Client：
[root@localhost ~]# rpm -qf /usr/bin/ssh-agent
openssh-clients-7.4p1-13.el7_4.x86_64
[root@localhost ~]# rpm -e openssh-clients
错误：依赖检测失败：
        openssh-clients 被 (已安裝) virt-viewer-5.0-7.el7.x86_64 需要
        openssh-clients 被 (已安裝) python-meh-0.25.2-1.el7.noarch 需要
[root@localhost ~]# yum remove  openssh-clients -y
作为依赖被删除:
  anaconda-core.x86_64 0:21.48.22.121-1.el7.centos    anaconda-gui.x86_64 0:21.48.22.121-1.el7.centos  
  anaconda-tui.x86_64 0:21.48.22.121-1.el7.centos     initial-setup.x86_64 0:0.3.9.40-1.el7.centos      
  initial-setup-gui.x86_64 0:0.3.9.40-1.el7.centos    python-meh.noarch 0:0.25.2-1.el7                  
  python-meh-gui.noarch 0:0.25.2-1.el7                virt-viewer.x86_64 0:5.0-7.el7

参考自：https://blog.csdn.net/diamondxiao/article/details/52488628

一）SSH现象：
ps -ef|grep ssh-agent|wc -l -bash: 管道错误: Too many open files in system -bash: start_pipeline: 进程组管道: Too many open files in system lsof -n |awk '{print $2}'|sort|uniq -c |sort -nr|more   -bash: /usr/bin/sort: Too many open files in system -bash: /usr/bin/sort: Too many open files in system lsof: error while loading shared libraries: libdl.so.2: cannot open shared object file: Error 23 rpm -qa|grep ssh-agent error: Failed to initialize NSS library [xiangdong@localhost ~]$ yum update nspr There was a problem importing one of the Python modules required to run yum. The error leading to this problem was: libz.so.1: cannot open shared object file: Too many open files in system reboot /usr/bin/pkttyagent: error while loading shared libraries: libffi.so.6: cannot open shared object file: Error 23 Failed to execute operation: 连接超时 sudo su - 上一次登录：一 5月 14 23:12:47 CST 2018:0 上 最后一次失败的登录：三 5月 16 22:27:19 CST 2018从 218.65.30.53ssh:notty 上 最有一次成功登录后有 64523 次失败的登录尝试。 [root@localhost ~]# reboot uptime -bash: start_pipeline: 进程组管道: Too many open files in system -bash: /usr/bin/uptime: Too many open files in system id -bash: start_pipeline: 进程组管道: Too many open files in system -bash: /usr/bin/id: Too many open files in system ps -ef|grep ssh -bash: 管道错误: Too many open files in system -bash: start_pipeline: 进程组管道: Too many open files in system


二）Linux桌面没了，出现：
系统出现kernel: audit: backlog limit exceeded提示
error: audit:backlog limit exceeded报错，audit缓冲大小瓶颈
来自：http://blog.51cto.com/jschu/1769025

三）如何强制重启？
有时候,linux 由于硬盘或者其它原因，
某个进程挂住了，怎么也杀不死，
输入 reboot 命令也无法重启。
这时候，一般只能按机箱上的reset健来重启了。
如果是远程ssh，那怎么办呢？


下面两行命令可以搞定：


echo 1 > /proc/sys/kernel/sysrq
echo b > /proc/sysrq-trigger
=========================================================
Linux使用shutdown -r now 或者 reboot、init 6 命令无法重启时使用以下两条命令可强制重启：
echo 1 > /proc/sys/kernel/sysrq  
echo b > /proc/sysrq-trigger  
1./proc/sys/kernel/sysrq
向 sysrq 文件中写入1是为了开启 SysRq 功能。根据 linux/Documentations/sysrq.txt 中所说：SysRq 代表的是 Magic System Request Key。开启了这个功能以后，只要内核没有挂掉，它就会响应你要求的任何操作。但是这需要内核支持(CONFIG_MAGIC_SYSRQ 选项)。向 /proc/sys/kernel/sysrq 中写入0是关闭 SysRq 功能，写入1是开启，其他选项请参考 sysrq.txt。

2./proc/sysrq-trigger
立即重新启动计算机:
echo "b" > /proc/sysrq-trigger
立即关闭计算机：
echo "o" > /proc/sysrq-trigger



来自：https://my.oschina.net/dongsong/blog/915358

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