取消启动solr时提示的file limit和Max Processes Limit 的限制

在linux系统中安装solr后，启动时提示两个警告，

*** [WARN] *** Your open file limit is currently 1024.  
 It should be set to 65000 to avoid operational disruption.
 If you no longer wish to see this warning, set SOLR_ULIMIT_CHECKS to false in your profile or solr.in.sh
*** [WARN] ***  Your Max Processes Limit is currently 4096.
 It should be set to 65000 to avoid operational disruption.
 If you no longer wish to see this warning, set SOLR_ULIMIT_CHECKS to false in your profile or solr.in.sh

如何取消呢

1。查看系统所有限制

[zhw@ecs-solr bin]$ ulimit -a
core file size          (blocks, -c) 0
data seg size           (kbytes, -d) unlimited
scheduling priority             (-e) 0
file size               (blocks, -f) unlimited
pending signals                 (-i) 127866
max locked memory       (kbytes, -l) 64
max memory size         (kbytes, -m) unlimited
open files                      (-n) 1024
pipe size            (512 bytes, -p) 8
POSIX message queues     (bytes, -q) 819200
real-time priority              (-r) 0
stack size              (kbytes, -s) 8192
cpu time               (seconds, -t) unlimited
max user processes              (-u) 4096
virtual memory          (kbytes, -v) unlimited
file locks                      (-x) unlimited

2。修改打开文件数限制

。 以root身份修改文件/etc/security/limits.conf文件，在最后添加下面两行

* soft nofile 65535
* hard nofile 65535

这个修改之后，重新登录生效。

3。修改进程限制

以root身份修改文件/etc/security/limits.d/20-nproc.conf 文件（centOS6为90-nproc.conf），文件内容为

*          soft    nproc     4096

root       soft    nproc     unlimited

将4090改成65535

修改后重新登录生效。