1、优化内核及TCP连接:
fs.file-max = 655350 # 系统文件描述符总量 net.ipv4.ip_local_port_range = 1024 65535 # 打开端口范围 net.ipv4.tcp_max_tw_buckets = 2000 # 设置tcp连接时TIME_WAIT个数 net.ipv4.tcp_tw_recycle = 1 # 开启快速tcp TIME_WAIT快速回收 net.ipv4.tcp_tw_reuse = 1 # 开启TIME_WAIT重用 net.ipv4.tcp_syncookies = 1 # 开启SYN cookies 当出现syn等待溢出,启用cookies来处理,可防范少量的syn攻击 net.ipv4.tcp_syn_retries = 2 # 对于一个新建的tcp连接,内核要发送几个SYN连接请求才决定放弃 net.ipv4.tcp_synack_retries = 2 # 这里是三次握手的第二次连接,服务器端发送syn+ack响应 这里决定内核发送次数 net.ipv4.tcp_keepalive_time = 1200 # tcp的长连接,这里注意:tcp的长连接与HTTP的长连接不同 net.ipv4.tcp_fin_timeout = 15 # 设置保持在FIN_WAIT_2状态的时间 net.ipv4.tcp_max_syn_backlog = 20000 # tcp半连接最大限制数 net.core.somaxconn = 65535 # 定义一个监听最大的队列数 net.core.netdev_max_backlog = 65535 # 当网络接口比内核处理数据包速度快时,允许送到队列数据包的最大数目 保存退出 [[email protected] ~]# sysctl -p # 添加生效
2、修改Tomcat Connector运行模式为apr
Tomcat Connector有三种运行模式:
bio:阻塞IO bio是三种运行模式中性能最低第一种。
nio:是一个基于缓冲区,并能提供非阻塞I/O操作的JAVA API 因此NIO也成为非阻塞I/O,比bio拥有更好的并发性能。
apr:调用httpd核心链接库来读取或文件传输,从而提高tomat对静态文件的处理性能。Tomcat APR模式也是Tomcat在高并发下的首选运行模式:
[[email protected] src]# java -version # 请确保JDK版本的正确性 java version "1.8.0_77" Java(TM) SE Runtime Environment (build 1.8.0_77-b03) Java HotSpot(TM) 64-Bit Server VM (build 25.77-b03, mixed mode)# 安装apr、apr-util、tomcat-native.tar.gz [[email protected] src]# wget http://apache.fayea.com//apr/apr-1.5.2.tar.gz [[email protected] src]# wget http://apache.fayea.com//apr/apr-util-1.5.4.tar.gz [[email protected] apr-1.5.2]# cd apr-1.5.2 [[email protected] apr-1.5.2]# vim configure #查找 $RM "$cfgfile" 这个地方,用#注释掉,然后就可以了 [[email protected] apr-1.5.2]# ./configure --prefix=/usr/local/apr [[email protected] apr-1.5.2]# make && make install [[email protected] apr-1.5.2]# cd .. [[email protected] src]# tar xf apr-util-1.5.4.tar.gz [[email protected] src]# cd apr-util-1.5.4 [[email protected] apr-util-1.5.4]# ./configure --prefix=/usr/local/apr-util --with-apr=/usr/local/apr/ [[email protected] apr-util-1.5.4]# make && make install [[email protected] apr-util-1.5.4]# ll /usr/local/apr* /usr/local/apr: total 16 drwxr-xr-x. 2 root root 4096 Apr 24 08:20 bin/ drwxr-xr-x. 2 root root 4096 Apr 24 08:20 build-1/ drwxr-xr-x. 3 root root 4096 Apr 24 08:20 include/ drwxr-xr-x. 3 root root 4096 Apr 24 08:20 lib/ /usr/local/apr-util: total 12 drwxr-xr-x. 2 root root 4096 Apr 24 08:23 bin/ drwxr-xr-x. 3 root root 4096 Apr 24 08:22 include/ drwxr-xr-x. 3 root root 4096 Apr 24 08:23 lib/ [[email protected] apr-util-1.5.4]# cp -a /usr/local/tomcat8.0/bin/tomcat-native.tar.gz /usr/local/src/ [[email protected] apr-util-1.5.4]# cd !$ cd /usr/local/src/ [[email protected] src]# tar xf tomcat-native.tar.gz [[email protected] src]# cd tomcat-native tomcat-native-1.2.5-src/ tomcat-native.tar.gz [[email protected] src]# cd tomcat-native-1.2.5-src/ [[email protected] tomcat-native-1.2.5-src]# cd native/ [[email protected] native]# ./configure --prefix=/usr/local/apr --with-java-home=/usr/local/jdk1.8/ [[email protected] native]# make && make install [[email protected] native]# vim /etc/profile.d/apr.sh export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/apr/lib :wq [[email protected] native]# source /etc/profile.d/apr.sh [[email protected] bin]# sh shutdown.sh [[email protected] bin]# sh startup.sh [[email protected] bin]# tail ../logs/catalina.out 24-Apr-2016 08:42:20.319 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory /usr/local/tomcat8.0/webapps/ROOT has finished in 39 ms 24-Apr-2016 08:42:20.320 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory /usr/local/tomcat8.0/webapps/examples 24-Apr-2016 08:42:20.713 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory /usr/local/tomcat8.0/webapps/examples has finished in 393 ms 24-Apr-2016 08:42:20.717 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory /usr/local/tomcat8.0/webapps/manager 24-Apr-2016 08:42:20.799 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory /usr/local/tomcat8.0/webapps/manager has finished in 82 ms 24-Apr-2016 08:42:20.799 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory /usr/local/tomcat8.0/webapps/docs 24-Apr-2016 08:42:20.835 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory /usr/local/tomcat8.0/webapps/docs has finished in 36 ms 24-Apr-2016 08:42:20.843 INFO [main] org.apache.coyote.AbstractProtocol.start Starting ProtocolHandler ["http-apr-8080"] # 通过查看启动日志,tomcat运行模式已经切换到APR。 24-Apr-2016 08:42:20.872 INFO [main] org.apache.coyote.AbstractProtocol.start Starting ProtocolHandler ["ajp-apr-8009"] 24-Apr-2016 08:42:20.877 INFO [main] org.apache.catalina.startup.Catalina.start Server startup in 1090 ms
三、Tomcat内存优化:
Tomcat内存优化主要是对tomcat启动参数优化,可以修改catalina.sh中设置JAVA_OPTS参数
1.JAVA_OPTS参数说明
-server 启用jdk 的 server 版; -Xms java虚拟机初始化时的最小内存; -Xmx java虚拟机可使用的最大内存;
配置如下:
[[email protected] bin]# vim /usr/local/tomcat8.0/bin/catalina.sh 97行 JAVA_OPTS=‘-server -Xms1024m -Xmx1024m‘
四、Tomcat并发优化
1、Tomcat配置文件server.xml中<Connector .../>
2、参数说明:
minProcessors:最小空闲连接线程数,用于提高系统处理性能,默认值为 10 maxProcessors:最大连接线程数,即:并发处理的最大请求数,默认值为 75 acceptCount:允许的最大连接数,应大于等于 maxProcessors ,默认值为 100 enableLookups:是否反查域名,取值为: true 或 false 。为了提高处理能力,应设置为 false connectionTimeout:网络连接超时,单位:毫秒。设置为 0 表示永不超时,这样设置有隐患的。通常可设置为 30000 毫秒。 其中和最大连接数相关的参数为maxProcessors 和 acceptCount 。如果要加大并发连接数,应同时加大这两个参数。 web server允许的最大连接数还受制于操作系统的内核参数设置,通常 Windows 是 2000 个左右, Linux 是 1000 个左右。 maxThreads 客户请求最大线程数minSpareThreads Tomcat初始化时创建的 socket 线程数maxSpareThreads Tomcat连接器的最大空闲 socket 线程数enableLookups 若设为true, 则支持域名解析,可把 ip 地址解析为主机名redirectPort 在需要基于安全通道的场合,把客户请求转发到基于SSL 的 redirectPort 端口acceptAccount 监听端口队列最大数,满了之后客户请求会被拒绝(不能小于maxSpareThreads )connectionTimeout 连接超时minProcessors 服务器创建时的最小处理线程数maxProcessors 服务器同时最大处理线程数URIEncoding URL统一编码
配置如下:
69 <Connector port="8080" protocol="HTTP/1.1" 70 maxThreads="1000" 71 minProcessors="100" 72 maxProcessors="1000" 73 minSpareThreads="100" 74 maxSpareThreads="1000" 75 enableLookups="false" 76 URIEncoding="utf-8" 77 acceptCount="1000" 78 connectionTimeout="20000" 79 disableUploadTimeout="ture" 80 redirectPort="8443" />
tomcat对内存及并发的优化就这些。可根据具体的资源进行调整。重启tomcat,观察日志有无报错。
原文地址:https://www.cnblogs.com/caiwenjing/p/8118635.html
时间: 2024-11-10 20:00:32