系统优化

部署步骤，注意黄色部分即可。

由于tomcat每次重启会重新写gc.log文件，所以在里面增加了日期属性，保留以往的日志做性能分析使用。

10.10.160.10和11上的catalina.sh我已经更新，以后拷贝即可。

 

<!--[if !supportLists]-->1.       <!--[endif]-->建立目录

mkdir -p /application/search/vertical-search/vertical-search

将apache-tomcat-7.0.52解压缩到/application/search/vertical-search/vertical-search目录下

         将JDK7解压到/application/search/vertical-search/java目录下

         并增加软链接

         ln -s /application/search/vertical-search/java/jdk1.7.0_51 /application/search/vertical-search/java/latest

 

<!--[if !supportLists]-->2.       <!--[endif]-->修改/application/search/vertical-search/vertical-search/apache-tomcat-7.0.52/bin/catalina.sh

首行增加

JAVA_HOME=/application/search/vertical-search/java/latest

CURRENT_TIME=`date +%Y-%m-%d_%H:%M:%S`

VERTICAL_SEARCH_LOG="/data0/search/vertical-search"

#如果自定义配置文件，需要增加VERTICAL_SEARCH_CONF变量，并且在JAVA_OPTS添加该变量，-DVERTICAL_SEARCH_CONF=${VERTICAL_SEARCH_CONF}

#VERTICAL_SEARCH_CONF="/application/search/vertical-search/conf"

JAVA_OPTS='-server -verbose:gc -Xms4000m -Xmx4000m -Xmn2000m -XX:PermSize=128m -XX:MaxPermSize=128m -Xss256k -XX:NewSize=500m -XX:MaxNewSize=500m -XX:+UseConcMarkSweepGC -XX:ParallelGCThreads=16 -XX:+UseCMSCompactAtFullCollection -XX:CMSMaxAbortablePrecleanTime=5000 -XX:+UseParNewGC -XX:+DisableExplicitGC -Xloggc:${VERTICAL_SEARCH_LOG}/logs/ gc.${CURRENT_TIME}.log -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=${VERTICAL_SEARCH_LOG}/logs/HeapDumpOnOutOfMemoryError.log -XX:+DisableExplicitGC -XX:+PrintGC -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -DVERTICAL_SEARCH_LOG=${VERTICAL_SEARCH_LOG}'

 

<!--[if !supportLists]-->3.       <!--[endif]-->修改/application/search/vertical-search/vertical-search/apache-tomcat-7.0.52/conf/server.xml

修改http连接点

         <Connector port="8199"

               protocol="org.apache.coyote.http11.Http11NioProtocol" 

               connectionTimeout="20000"

               URIEncoding="UTF-8"

               useBodyEncodingForURI="true"

               maxThreads="1024"

               minSpareThreads="256"

               enableLookups="false" />

         删除AJP协议，减少端口占用

<Connector port="8009" protocol="AJP/1.3" redirectPort="8443" />

 

<!--[if !supportLists]-->4.       <!--[endif]-->修改/application/search/vertical-search/vertical-search/apache-tomcat-7.0.52/tomcat-users.xml，方便跟踪调试，观察线上性能情况

在</tomcat-users>节点增加以下行

<user name="root" password="vertical" roles="admin,manager,manager-gui" />

注意：请不要删除/application/search/vertical-search/vertical-search/apache-tomcat-7.0.52/webapps目录下的文件，管理页面和后期性能监控要靠看这个页面

 

<!--[if !supportLists]-->5.       <!--[endif]-->日志设置，请注意不要删除logs下面的已有日志，切记！

创建logs输出目录

mkdir -p /data0/search/vertical-search

将tomcat的服务器日志修改到/data0磁盘下

mv /application/search/vertical-search/vertical-search/apache-tomcat-7.0.52/logs  /data0/search/vertical-search

建立软连接

ln -s /data0/search/vertical-search/logs /application/search/vertical-search/vertical-search/apache-tomcat-7.0.52/logs

 

<!--[if !supportLists]-->6.       <!--[endif]-->maven打包命令

mvn clean package -U -Dmaven.test.skip=true -Ponline -T 1C

 

<!--[if !supportLists]-->7.       <!--[endif]-->操作系统内核优化(需要ROOT权限，并且需要注意CENTOS6.4和5.5的版本区别)，修改/etc/sysctl.conf ,并追加以下内容

net.ipv4.tcp_tw_reuse = 1

net.ipv4.tcp_tw_recycle = 1

net.ipv4.tcp_fin_timeout = 5

net.ipv4.tcp_max_syn_backlog = 65536

net.core.netdev_max_backlog =  32768

net.core.somaxconn = 32768

net.core.wmem_default = 8388608

net.core.rmem_default = 8388608

net.core.rmem_max = 16777216

net.core.wmem_max = 16777216

net.ipv4.tcp_timestamps = 0

net.ipv4.tcp_synack_retries = 2

net.ipv4.tcp_syn_retries = 2

net.ipv4.tcp_mem = 94500000 915000000 927000000

net.ipv4.tcp_max_orphans = 3276800

net.ipv4.ip_local_port_range = 2000  65535

net.ipv4.tcp_max_tw_buckets = 5000

 

net.ipv4.netfilter.ip_conntrack_max = 1000000