Centos7-Tomcat启动很慢问题

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本文介绍如何解决Centos7系统中Tomcat启动慢的问题，通过一系列优化措施，提升Tomcat启动效率。
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1、解决Centos7下tomcat启动很慢问题
[root@iZwz93e3cxesxun8e2ti7rZ app]# yum install rng-tools 
Loaded plugins: fastestmirror
base                                                                                                                                                                                                                                                   | 3.6 kB  00:00:00     
epel                                                                                                                                                                                                                                                   | 4.3 kB  00:00:00     
extras                                                                                                                                                                                                                                                 | 3.4 kB  00:00:00     
updates                                                                                                                                                                                                                                                | 3.4 kB  00:00:00     
(1/7): base/7/x86_64/group_gz                                                                                                                                                                                                                          | 155 kB  00:00:00     
(2/7): epel/x86_64/group_gz                                                                                                                                                                                                                            | 170 kB  00:00:00     
(3/7): epel/x86_64/updateinfo                                                                                                                                                                                                                          | 784 kB  00:00:00     
(4/7): extras/7/x86_64/primary_db                                                                                                                                                                                                                      | 168 kB  00:00:00     
(5/7): epel/x86_64/primary_db                                                                                                                                                                                                                          | 4.8 MB  00:00:01     
(6/7): base/7/x86_64/primary_db                                                                                                                                                                                                                        | 5.6 MB  00:00:01     
(7/7): updates/7/x86_64/primary_db                                                                                                                                                                                                                     | 6.4 MB  00:00:01     
Determining fastest mirrors
Resolving Dependencies
--> Running transaction check
---> Package rng-tools.x86_64 0:5-8.el7 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

==============================================================================================================================================================================================================================================================================
 Package                                                             Arch                                                             Version                                                            Repository                                                      Size
==============================================================================================================================================================================================================================================================================
Installing:
 rng-tools                                                           x86_64                                                           5-8.el7                                                            base                                                            34 k

Transaction Summary
==============================================================================================================================================================================================================================================================================
Install  1 Package

Total download size: 34 k
Installed size: 68 k
Is this ok [y/d/N]: y
Downloading packages:
rng-tools-5-8.el7.x86_64.rpm                                                                                                                                                                                                                           |  34 kB  00:00:00     
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Warning: RPMDB altered outside of yum.
** Found 2 pre-existing rpmdb problem(s), 'yum check' output follows:
2:postfix-2.10.1-6.el7.x86_64 has missing requires of libmysqlclient.so.18()(64bit)
2:postfix-2.10.1-6.el7.x86_64 has missing requires of libmysqlclient.so.18(libmysqlclient_18)(64bit)
  Installing : rng-tools-5-8.el7.x86_64                                                                                                                                                                                                                                   1/1 
  Verifying  : rng-tools-5-8.el7.x86_64                                                                                                                                                                                                                                   1/1 

Installed:
  rng-tools.x86_64 0:5-8.el7                                                                                                                                                                                                                                                  

Complete!
[root@iZwz93e3cxesxun8e2ti7rZ app]# 
[root@iZwz93e3cxesxun8e2ti7rZ app]# 
[root@iZwz93e3cxesxun8e2ti7rZ app]# ls
apr-1.5.2  apr-util-1.5.2  bakup  jdk1.7  logs  openssl-1.0.2l  share  tomcat7
[root@iZwz93e3cxesxun8e2ti7rZ app]# systemctl start rngd