高负载web架构(三)

d.node4上安装apache+tomcat

安装jdk1.7.0_67 需要依赖JDK才能运行 jdk1.7.0_67apache-tomcat-7.0.55.tar.gz存在兼容性问题   apache-tomcat-7.0.42.tar.gz

#rpm -ivh jdk-7u67-linux-x64.rpm

# tar xf apache-tomcat-7.0.55.tar.gz-C /usr/local/

导出命令

# cat/etc/profile.d/java.sh

exportJAVA_HOME=/usr/java/jdk1.7.0_67   这里是固定格式的

exportPATH=$JAVA_HOME/bin:$PATH

#./etc/profile.d/java.sh

# ln -svapache-tomcat-7.0.55 tomcat

# cat/etc/profile.d/tomcat.sh   

exportCATALINA_HOME=/usr/local/tomcat

exportPATH=$CATALINA_HOME/bin:$PATH

作为tomcat的启动脚本,添加到/etc/rc.d/init.d/tomcat文件中

#!/bin/sh

# Tomcat initscript for Linux.

#

# chkconfig: 234596 14

# description: TheApache Tomcat servlet/JSP container.

# JAVA_OPTS='-Xms64m-Xmx128m'

JAVA_HOME=/usr/java/latest

CATALINA_HOME=/usr/local/tomcat

export JAVA_HOMECATALINA_HOME

 

case $1 in

start)

  exec $CATALINA_HOME/bin/catalina.sh start ;;

stop)

  exec $CATALINA_HOME/bin/catalina.sh stop;;

restart)

  $CATALINA_HOME/bin/catalina.sh stop

  sleep 2

  exec $CATALINA_HOME/bin/catalina.sh start ;;

*)

  echo "Usage: `basename $0`{start|stop|restart}"

  exit 1

  ;;

esac

给其执行权限

# chmod +x/etc/rc.d/init.d/tomcat

添加到服务列表中

# chkconfig --addtomcat

启动tomcat

service tomcatstart

ss -tnlp | grep8080

部署一个虚拟主机,在配置文件修改如下:server.xml

 <Host>组后面添加

<Hostname="www.tree.com" appBase="/tomcat"

      unpackWARs="true"autoDeploy="true">

     <Context path=""docBase="webapps" reLoadable="true" />

</Host>

或者是

<Host name="www.tree.com"  appBase="/tomcat/webapps"

            unpackWARs="true"autoDeploy="true">

</Host>

但是资源需要在/tomcat/webapps/ROOT目录下

修改

<Enginename="Catalina" defaultHost="localhost"><Enginename="Catalina" defaultHost="www.tree.com"> 

修改监听的端口为80,默认是8080

<Connectorport="80" protocol="HTTP/1.1"

              connectionTimeout="20000"

               redirectPort="8443"/>

创建目录路径:

# tree /tomcat/

/tomcat/

└── webapps

        ├── index.jsp

其中/tomcat/webapps/test/index.jsp测试页内容如下:

# cat /tomcat/webapps/index.jsp

<%@ page language="java" %>

<%@ page import="java.util.*" %>

<html>

  <head>

         <title> JSP TestPage</title>

  </head>

  <body>

     <%

       out.println("Hello How are you.");

       out.println("Hello there.");

     %>

  </body>

</html>

#catalina.sh start

查看端口是否起来

#ss -tnl

访问测试

http://192.168.21.166

tomcat上,多个应用就多个tomcat,不建议Context,也不建议虚拟主机,单机多实例去运行。

 

编译安装httpd

准备好环境

# yuminstall -y gcc gcc-c++ pcre-devel openssl-devel

# tar  xf apr-1.4.6.tar.bz2 -C /usr/local

# cd apr-1.4.6

# ./configure--prefix=/usr/local/apr

# make &&make install

apr-utilapr的工具库,其可以让程序员更好的使用apr的功能。可以从http://apr.apache.org/获取apr源码,目前最新的版本是1.4.1

# tar xfapr-util-1.4.1.tar.bz2 -C /usr/local

# cdapr-util-1.4.1

#  ./configure --prefix=/usr/local/apr-util --with-apr=/usr/local/apr

#  make && make install

安装apache

httpd目前最新的2.4系列版本中引入了event MPM,其在性能上较之其它MPM有了较大的提升,

# tar xfhttpd-2.4.2 -C /usr/local

# cd httpd-2.4.2

# ./configure--prefix=/usr/local/apache --sysconfdir=/etc/httpd --enable-so --enable-ssl --enable-cgi--enable-rewrite --with-zlib --with-pcre --with-apr=/usr/local/apr--with-apr-util=/usr/local/apr-util --enable-mpms-shared=all --with-mpm=event--enable-proxy --enable-proxy-http --enable-proxy-ajp --enable-proxy-balancer  --enable-lbmethod-heartbeat--enable-heartbeat --enable-slotmem-shm --enable-slotmem-plain --enable-watchdog

# make &&make install

apache提供init脚本,实现服务的控制。建立/etc/rc.d/init.d/httpd文件,并添加如下内容:

这是个脚本文件,因此需要执行权限;同时,为了让httpd服务能够开机自动启动,还需要将其添加至服务列表。

# cat/etc/rc.d/init.d/httpd

#!/bin/bash

#

#httpd        Startup script for theApache HTTP Server

#

#chkconfig: - 85 15

#description: Apache is a World Wide Web server. It is used to serve \

#        HTML files and CGI.

#processname: httpd

 

#Source function library.

./etc/rc.d/init.d/functions

 

if [-f /etc/sysconfig/httpd ]; then

        . /etc/sysconfig/httpd

fi

 

#Start httpd in the C locale by default.

HTTPD_LANG=${HTTPD_LANG-"C"}

 

#This will prevent initlog from swallowing up a pass-phrase prompt if

#mod_ssl needs a pass-phrase from the user.

INITLOG_ARGS=""

 

# SetHTTPD=/usr/sbin/httpd.worker in /etc/sysconfig/httpd to use a server

#with the thread-based "worker" MPM; BE WARNED that some modules maynot

#work correctly with a thread-based MPM; notably PHP will refuse to start.

 

#Path to the apachectl script, server binary, and short-form for messages.

apachectl=/usr/local/apache/bin/apachectl

httpd=${HTTPD-/usr/local/apache/bin/httpd}

prog=httpd

pidfile=${PIDFILE-/var/run/httpd.pid}

lockfile=${LOCKFILE-/var/lock/subsys/httpd}

RETVAL=0

 

start(){

        echo -n $"Starting $prog: "

        LANG=$HTTPD_LANG daemon--pidfile=${pidfile} $httpd $OPTIONS

        RETVAL=$?

        echo

        [ $RETVAL = 0 ] && touch${lockfile}

        return $RETVAL

}

 

stop(){

  echo -n $"Stopping $prog: "

  killproc -p ${pidfile} -d 10 $httpd

  RETVAL=$?

  echo

  [ $RETVAL = 0 ] && rm -f ${lockfile}${pidfile}

}

reload(){

    echo -n $"Reloading $prog: "

    if ! LANG=$HTTPD_LANG $httpd $OPTIONS -t>&/dev/null; then

        RETVAL=$?

        echo $"not reloading due toconfiguration syntax error"

        failure $"not reloading $httpd dueto configuration syntax error"

    else

        killproc -p ${pidfile} $httpd -HUP

        RETVAL=$?

    fi

    echo

}

 

# Seehow we were called.

case"$1" in

  start)

  start

  ;;

  stop)

  stop

  ;;

  status)

        status -p ${pidfile} $httpd

  RETVAL=$?

  ;;

  restart)

  stop

  start

  ;;

  condrestart)

  if [ -f ${pidfile} ] ; then

    stop

    start

  fi

  ;;

  reload)

        reload

  ;;

  graceful|help|configtest|fullstatus)

  $apachectl $@

  RETVAL=$?

  ;;

  *)

  echo $"Usage: $prog{start|stop|restart|condrestart|reload|status|fullstatus|graceful|help|configtest}"

  exit 1

esac

 

exit$RETVAL

#chmod  +x /etc/rc.d/init.d/httpd

#chkconfig  --add httpd

启动时需要先修改tomcat使用HTTP协议监听的端口

# service httpdstart  启动时,显示正常,但是查看不到监听的端口,status查看状态是没有起来的,查看错误日志 /usr/local/apache/logs/error_log

[Thu Aug 0608:01:25.328782 2015] [proxy_balancer:emerg] [pid 3966:tid 139927044081408]AH01177: Failed to lookup provider 'shm' for 'slotmem': is mod_slotmem_shmloaded??

[Thu Aug 0608:01:25.336850 2015] [:emerg] [pid 3966:tid 139927044081408] AH00020:Configuration Failed, exiting

/etc/httpd/httpd.conf中启用

LoadModuleslotmem_shm_module modules/mod_slotmem_shm.so,而后再启动httpd时,就可以正常了,但是查看错误日志还有信息

[Thu Aug 0608:04:39.837549 2015] [lbmethod_heartbeat:notice] [pid 4005:tid139928518989568] AH02282: No slotmem from mod_heartmonitor

把此模块注释了

#LoadModulelbmethod_heartbeat_module modules/mod_lbmethod_heartbeat.so

此时启动httpd,错误日志中就不会有错误提示了

但是此时关闭httpd时,提示错误,而且关闭不了httpd,查看以后发现,启动httpd后,其pid文件根本不是放在/var/run/httpd.pid中,而是在/usr/local/apache/logs/httpd.pid,所以httpd的启动脚本/etc/rc.d/init.d/httpd需要改一下pidfile那项,改为如下:

pidfile=${PIDFILE-/var/run/httpd.pid}

pidfile=${PIDFILE-/usr/local/apache/logs/httpd.pid}

或者是在/etc/httpd/httpd.conf配置文件中指定PidFile=/var/run/httpd.pid

修改启用ServerName

此时httpd就可以正常启动和关闭了

Apachemod_proxy方式和tomcat结合

在主配置文件/etc/httpd/httpd.conf尾部添加如下内容:

ProxyViaOff

ProxyRequestsOff

ProxyPass/ http://192.168.21.166:8080/

ProxyPassReverse/ http://192.168.21.166:8080/

<Proxy*>

     Require all granted

</Proxy>

 

<Location/>

     Require all granted

</Location>    也可以把此内容添加到虚拟主机中,需要把主配置文件中的DocumentRoot给注释了。而后在虚拟配置文件中添加如下内容:

<VirtualHost*:80>

       ProxyVia Off

       ProxyRequests Off

       ProxyPass / http://192.168.21.166:8080/

       ProxyPassReverse /http://192.168.21.166:8080/

       <Proxy *>

           Require all granted

       </Proxy>

      

       <Location />

           Require all granted

       </Location>

</VirtualHost>

此时在浏览器上访问可以正常代理到后端tomcat上了

 

e.node8node88上部署好DRBDmysql高可用,一般情况下这里都是MySQL做主从,有多个从服务器,在多个从服务器时如果读请求压力还未减轻,则需要通过在从服务器前端添加一层读缓存,能命中的读请求在还未过期时或者过期后数据未改变时,都到缓存中取结果进行返回。没有命中则需要到从服务器上查找结果,找到后缓存一份而后再进行读返回。

准备好MySQL源码包

# ls/usr/local/src/

mariadb-10.0.13.tar.gz

这里是通过脚本的方式自动化实现安装

#!/bin/bash

useradd -r -s /sbin/nologinmysql > /dev/null

#vgextend$(vgs|awk '{if(NR==2) {print $1}}') /dev/sdb > /dev/null

lvcreate -L 18G -ndata vg_lvm > /dev/null

mkdir /mysql

mkfs.ext4/dev/vg_lvm/data > /dev/null

mount/dev/vg_lvm/data /mysql

mkdir /mysql/data

chown -R mysql.mysql/mysql/data

tar -xf/usr/local/src/mariadb-10.0.13.tar.gz -C /usr/local/

yum groupinstall-y "Development tools" "Server Platform Development" >/dev/null

echo -e"\033[42mGroupinstall is OK.\033[0m"

yum install -ylibxml2-devel cmake > /dev/null

echo -e"\033[42mInstall is OK.\033[0m"

cd/usr/local/mariadb-10.0.13/

cmake .-DMYSQL_DATADIR=/mysql/data -DWITH_SSL=system -DWITH_SPHINX_STORAGE_ENGINE=1> /dev/null 

echo -e"\033[42mCmake is OK.\033[0m"

make &&make install > /dev/null

echo -e "\033[42mMakeand Make install is OK.\033[0m"

cd/usr/local/mysql

echo "exportPATH=/usr/local/mysql/bin:$PATH" > /etc/profile.d/mysql.sh

source/etc/profile.d/mysql.sh

cp -fsupport-files/my-large.cnf /etc/my.cnf

sed -i'/^\[mysqld\]/a datadir=/mysql/data' /etc/my.cnf

cp/usr/local/mysql/support-files/mysql.server /etc/rc.d/init.d/mysqld

chmod +x/etc/rc.d/init.d/mysqld

chkconfig --addmysqld

chkconfig mysqldon

chown -Rroot.mysql /usr/local/mysql/*

/usr/local/mysql/scripts/mysql_install_db--user=mysql --datadir=/mysql/data > /dev/null 

echo -e"033[42mMysql initial is ok.\033[0m"

service mysqldstart

ss -tnlp|grep 3306

高可用corosync+pacemaker实现

配置HA的前提:

       时间同步、基于主机名互相通信、SSH互信

   安装程序包corosync, pacemaker

这里在MySQL高可用情况下,需要的资源有vip , mysqld , filesystem[rsync+inotifynfs]或者block store[DRBDiscsi]

这里通过DRBD来实现block store

考虑到有多个资源,组织多个资源的两种方案:

       group 定义组

       constraint  定义约束

              location    位置约束   服务中的多个资源更倾向于哪个节点上

              order      顺序约束   服务中的多个资源的启动及关闭次序

              colocation  排列约束   服务中的多个资源在一起的倾向性

安装pacemaker时依赖corosync

#yum install -ypacemaker

生成认证文件

#corosync-keygen

直接生成key的,默认是从熵池中读取随机数的,如果随机数不够就会处于等待状态,需要通过敲击键盘来生成随机数。通过yum安装普通的包,也能更快产生随机数

/etc/corosync/authkey

-r-------- 1 rootroot 128 Aug  8 15:38/etc/corosync/authkey

配置文件/etc/corosync/corosync.conf.example复制为/etc/corosync/corosync.conf

# cp/etc/corosync/corosync.conf.example /etc/corosync/corosync.conf

修改配置文件/etc/corosync/corosync.conf

       secauth: off   是否基于安全方式认证每一个节点  改为on

       threads: 0   启动的线程数,通过cpu核心数进行修改

       bindnetaddr: 192.168.1.0  打算绑定在哪个网络地址上改为 192.168.21.0

       mcastaddr: 239.255.1.1   多播地址改为 226.194.25.36[需要处于多播的范围]

   这里两种记录日志的方式都打开了

    to_syslog: yes    改为no

    amf 定义corosync是否启用openaisamf机制即是否兼容其API机制,corosync必须以插件化的方式运行pacemaker,在2.0之前pacemaker是作为corosync的插件,在2.0之后pacemaker是一个独立的服务了。需要补充一个插件

加上如下:

service {  指定插件

  ver:  0

  name: pacemaker

  # use_mgmtd: yes

}

 

aisexec {   ais运行时的用户

  user: root

  group: root

}

 

amf {

        mode: disabled

}

高可用节点双方实现互信

#ssh-keygen -t rsa-P ''

#ssh-copy-id -i/root/.ssh/id_rsa.pub nodeXX

把认证文件和配置文件复制到高可用的另外一个节点上

# scp/etc/corosync/corosync.conf node88:/etc/corosync/corosync.conf

# scp/etc/corosync/authkey node88:/etc/corosync/authkey

启动corosync

# service corosyncstart

查看corosync引擎是否正常启动:

# grep -e"Corosync Cluster Engine" -e "configuration file"/var/log/cluster/corosync.log

Aug 08 15:56:29corosync [MAIN  ] Corosync Cluster Engine('1.4.7'): started and ready to provide service.

Aug 08 15:56:29corosync [MAIN  ] Successfully read mainconfiguration file '/etc/corosync/corosync.conf'.

查看初始化成员节点通知是否正常发出:

# grep  TOTEM /var/log/cluster/corosync.log

Aug 08 15:56:29corosync [TOTEM ] Initializing transport (UDP/IP Multicast).

Aug 08 15:56:29corosync [TOTEM ] Initializing transmit/receive security: libtomcryptSOBER128/SHA1HMAC (mode 0).

Aug 08 15:56:29corosync [TOTEM ] The network interface [192.168.21.159] is now up.

Aug 08 15:56:29corosync [TOTEM ] A processor joined or left the membership and a newmembership was formed.

Aug 08 15:56:49corosync [TOTEM ] A processor joined or left the membership and a new membershipwas formed.

检查启动过程中是否有错误产生。下面的错误信息表示packmaker不久之后将不再作为corosync的插件运行,因此,建议使用cman作为集群基础架构服务;此处可安全忽略。

# grep ERROR:/var/log/cluster/corosync.log | grep -v unpack_resources

Aug 08 15:56:29corosync [pcmk  ] ERROR:process_ais_conf: You have configured a cluster using the Pacemaker plugin forCorosync. The plugin is not supported in this environment and will be removedvery soon.

Aug 08 15:56:29corosync [pcmk  ] ERROR:process_ais_conf:  Please see Chapter 8of 'Clusters from Scratch' (http://www.clusterlabs.org/doc) for details onusing Pacemaker with CMAN

Aug 08 15:56:32corosync [pcmk  ] ERROR:pcmk_wait_dispatch: Child process cib terminated with signal 6 (pid=32326,core=true)

。。。

Aug 08 15:59:32corosync [pcmk  ] ERROR:pcmk_wait_dispatch: Child process crmd exited (pid=1050, rc=201)

查看pacemaker是否正常启动:

#  grep pcmk_startup/var/log/cluster/corosync.log

Aug 08 15:56:29corosync [pcmk  ] info: pcmk_startup:CRM: Initialized

Aug 08 15:56:29corosync [pcmk  ] Logging: Initializedpcmk_startup

Aug 08 15:56:29corosync [pcmk  ] info: pcmk_startup:Maximum core file size is: 18446744073709551615

Aug 08 15:56:29corosync [pcmk  ] info: pcmk_startup:Service: 9

Aug 08 15:56:29corosync [pcmk  ] info: pcmk_startup:Local hostname: node8

pacemaker的配置接口:

       crmsh centos 6.4之前使用的   suse提供的

       pcs   centos 6.4之后使用的   redhat提供的

这里以crmsh为例,crmsh依赖于pssh

# wgethttp://download.opensuse.org/repositories/network:/ha-clustering:/Stable/CentOS_CentOS-6/network:ha-clustering:Stable.repo

# cp network\:ha-clustering\:Stable.repo/etc/yum.repos.d/

# yum -y installcrmsh

复制到另一个高可用节点上

# scp/root/network\:ha-clustering\:Stable.repo node88:/etc/yum.repos.d

 在高可用场景下需要注意VIP


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