解决Tomcat无法正常运行，导致Service Unavailable的问题

问题描述：
Tomcat可以启动，但无法正常停止，访问Service Unavailable

启动正常

[root@izuf6h1i09ke9avl0zp3kqz bin]# ./catalina.sh start
Using CATALINA_BASE:   /var/apache-tomcat-8.5.34
Using CATALINA_HOME:   /var/apache-tomcat-8.5.34
Using CATALINA_TMPDIR: /var/apache-tomcat-8.5.34/temp
Using JRE_HOME:        /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.262.b10-0.el7_8.x86_64/jre
Using CLASSPATH:       /var/apache-tomcat-8.5.34/bin/bootstrap.jar:/var/apache-tomcat-8.5.34/bin/tomcat-juli.jar
Tomcat started.

停止异常

[root@izuf6h1i09ke9avl0zp3kqz bin]# ./shutdown.sh
Using CATALINA_BASE:   /var/apache-tomcat-8.5.34
Using CATALINA_HOME:   /var/apache-tomcat-8.5.34
Using CATALINA_TMPDIR: /var/apache-tomcat-8.5.34/temp
Using JRE_HOME:        /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.262.b10-0.el7_8.x86_64/jre
Using CLASSPATH:       /var/apache-tomcat-8.5.34/bin/bootstrap.jar:/var/apache-tomcat-8.5.34/bin/tomcat-juli.jar
Oct 25, 2020 11:02:42 PM org.apache.catalina.startup.Catalina stopServer
SEVERE: Could not contact [localhost:[8005]]. Tomcat may not be running.
Oct 25, 2020 11:02:42 PM org.apache.catalina.startup.Catalina stopServer
SEVERE: Catalina.stop:
java.net.ConnectException: Connection refused (Connection refused)
        at java.net.PlainSocketImpl.socketConnect(Native Method)
        at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
        at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
        at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
        at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
        at java.net.Socket.connect(Socket.java:607)
        at java.net.Socket.connect(Socket.java:556)
        at java.net.Socket.(Socket.java:452)
        at java.net.Socket.(Socket.java:229)
        at org.apache.catalina.startup.Catalina.stopServer(Catalina.java:497)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.apache.catalina.startup.Bootstrap.stopServer(Bootstrap.java:406)
        at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:498)

解决办法
找到jdk目录例如’’jdk1.8.0 /jre/lib/security/”,在该文件夹下打开编辑java.security文件
将 “securerandom.source=file:/dev/random”
修改为 “securerandom.source=file:/dev/./urandom ”
重启tomcat就可以了