linux – su：/ bin / bash：资源暂时不可用

无法将用户切换为postgres.

postgres用户的ulimit设置设置了合理的限制.我们没有达到最高限度.

/ var / log / messages中没有错误.

错误：

BETA -bash-4.2# sudo su - postgres
su: /bin/bash: Resource temporarily unavailable

设置：

BETA -bash-4.2# ps -auxww | grep -i postgr | wc -l
503
BETA -bash-4.2# lsof | grep -i postgr | wc -l
35225
BETA -bash-4.2#

适用于postgres流程的Ulimit.

BETA -bash-4.2# cat /proc/26230/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             256580               256580               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       256580               256580               signals   
Max msgqueue size         819200               819200               bytes     
Max nice priority         0                    0                    
Max realtime priority     0                    0                    
Max realtime timeout      unlimited            unlimited            us

用netstat

BETA -bash-4.2# netstat -plan | grep -i post | grep ESTABLISHED | wc -l
496
BETA -bash-4.2#

Ulimit设置

BETA -bash-4.2# cat /etc/security/limits.d/postgres_limits.conf 
# Limits settings for postgres

postgres soft nofile 4096
postgres hard nofile 4096

postgres soft nproc 400
postgres hard nproc 400

在我重新开始postgres之后,我能够进入.

postgres用户的资源工具.

BETA -bash-4.2# netstat -plan | grep -i post | grep ESTABLISHED | wc -l
1
BETA -bash-4.2# 

BETA -bash-4.2# lsof | grep -i postgr | wc -l
309
BETA -bash-4.2# ps -auxww | grep -i postgr | wc -l
8
BETA -bash-4.2#

解决方法

只是重新启动postgres不是一个长期的解决方案,你将再次达到极限,除非你在服务器上有物理资源限制,如内存.在发布期间,postgres用户打开的进程数(nproc)为503,估计打开文件数(nofile)为35225,而你的postgres_limits.conf显示你已经将nproc设置为400而nofile设置为仅4096.在您的数据上,您将需要增加这两个参数.