Too many open files

linux 上tomcat 服務器拋出socket異常“文件打開太多”的問題

java.net.SocketException: Too many open files

1。ulimit -a 查看系統目前資源限制的設定。

[root@test security]# umlimit -a
-bash: umlimit: command not found
[root@test security]# ulimit -a
core file size        (blocks, -c) 0
data seg size         (kbytes, -d) unlimited
file size             (blocks, -f) unlimited
max locked memory     (kbytes, -l) unlimited
max memory size       (kbytes, -m) unlimited
open files                    (-n) 1024
pipe size          (512 bytes, -p) 8
stack size            (kbytes, -s) 8192
cpu time             (seconds, -t) unlimited
max user processes            (-u) 7168
virtual memory        (kbytes, -v) unlimited
[root@test security]#

通過以上命令，我們可以看到open files 的最大數爲1024
那麼我們可以通過一下命令修改該參數的最大值

2. ulimit -n 4096
[root@test security]# ulimit -n 4096
[root@test security]# ulimit -a
core file size        (blocks, -c) 0
data seg size         (kbytes, -d) unlimited
file size             (blocks, -f) unlimited
max locked memory     (kbytes, -l) unlimited
max memory size       (kbytes, -m) unlimited
open files                    (-n) 4096
pipe size          (512 bytes, -p) 8
stack size            (kbytes, -s) 8192
cpu time             (seconds, -t) unlimited
max user processes            (-u) 7168
virtual memory        (kbytes, -v) unlimited

這樣我們就修改了系統在同一時間打開文件資源的最大數，基本解決以上問題。