Linux - CentOS 7 - 查看应用程序所打开的文件数（句柄）

这里以tomcat为例
1 找出tomcat进程号

[root@local ~]# ps -aux | grep java
root     16708  6.8  9.8 28268812 6496460 ?    Sl   Dec25  72:41 /opt/software/jdk8/jdk1.8.0_201-amd64/bin/java -Djava.util.logging.config.file=/opt/software/apache-tomcat-8.5.41/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djdk.tls.ephemeralDHKeySize=2048 -Djava.protocol.handler.pkgs=org.apache.catalina.webresources -Dorg.apache.catalina.security.SecurityListener.UMASK=0027 -Dignore.endorsed.dirs= -classpath /opt/software/apache-tomcat-8.5.41/bin/bootstrap.jar:/opt/software/apache-tomcat-8.5.41/bin/tomcat-juli.jar -Dcatalina.base=/opt/software/apache-tomcat-8.5.41 -Dcatalina.home=/opt/software/apache-tomcat-8.5.41 -Djava.io.tmpdir=/opt/software/apache-tomcat-8.5.41/temp org.apache.catalina.startup.Bootstrap start
root     21104  0.0  0.0 112708   980 pts/0    S+   10:23   0:00 grep --color=auto java

2 查看应用程序进程打开的文件数

[root@local ~]# lsof -p 16708 | wc -l
2183