nginx+keepalived高可用web架构

1、下载所需的软件包

（1）、keepalived软件包keepalived-1.1.20.tar.gz
（2）、nginx软件包nginx-1.1.6.tar.gz
（3）、nginx模块软件包libunwind-0.99.tar.gzagentzh-encrypted-session-nginx-module-v0.02-0-gc752861.tar.gzchunkin-nginx-module-0.23rc2.tar.gzgoogle-perftools-1.8.3.tar.gzpcre-8.11.tar.gzsimpl-ngx_devel_kit-v0.2.17-10-g4192ba6.tar.gz

2、安装脚本

#!/bin/bash
#
#
# this is install nginx
#
#
keepalived_dir=/usr/local/keepalived
tar_dir=/usr/src
kernel=$(uname -r)
software_dir=/root/softwarecd $software_dir
yum install gcc gcc-c++ autoconf automake wget openssl-devel kernel-devel  pcre-devel zlib-devel -y
echo "tar and mv nginx module"
tar -zxf agentzh-encrypted-session-nginx-module-v0.02-0-gc752861.tar.gz
mv agentzh-encrypted-session-nginx-module-c752861 encrypted-session-nginx-moduletar -zxf chunkin-nginx-module-0.23rc2.tar.gz
mv chunkin-nginx-module-0.23rc2 chunkin-nginx-moduletar -zxf simpl-ngx_devel_kit-v0.2.17-10-g4192ba6.tar.gz
mv simpl-ngx_devel_kit-4192ba6 ngx_devel_kitecho "configure and install pcre"
tar zxf pcre-8.11.tar.gz
cd pcre-8.11
make clean
./configure
make && make installecho "configure and install google-perftools use"
cd $software_dir
tar -zxf libunwind-0.99.tar.gz
cd libunwind-0.99
make clean
./configure  CFLAGS=-fPIC
make CFLAGS=-fPIC
make install CFLAGS=-fPIC echo "configure and install google-perftools"
cd $software_dir
tar zxf google-perftools-1.8.3.tar.gz
cd google-perftools-1.8.3
./configure --enable-frame-pointers #64
make -j 4 && make installln -s /usr/local/lib/libprofiler.so.0 /lib/
ln -s /usr/local/lib/libprofiler.so.0 /usr/lib
ln -s /usr/local/lib/libprofiler.so.0 /lib64
ln -s /usr/local/lib/libprofiler.so.0 /usr/lib64ln -s /usr/local/lib/libunwind.so.7 /lib/
ln -s /usr/local/lib/libunwind.so.7 /usr/lib
ln -s /usr/local/lib/libunwind.so.7 /lib64
ln -s /usr/local/lib/libunwind.so.7 /usr/lib64echo "configure and install nginx"
cd $software_dir
tar -zxf nginx-1.1.6.tar.gz
cd nginx-1.1.6
make clean
./configure --prefix=/usr/local/nginx --user=www --group=www --with-http_ssl_module --with-file-aio --with-http_stub_status_module --with-http_sub_module --with-http_addition_module --with-http_random_index_module --with-http_secure_link_module --with-http_dav_module --with-http_mp4_module --with-http_degradation_module --with-http_gzip_static_module --with-google_perftools_module --with-http_flv_module --add-module=/root/software/chunkin-nginx-module --add-module=/root/software/ngx_devel_kit/ --add-module=/root/software/encrypted-session-nginx-module --with-pcre
make && make install
cd $software_diruseradd www  #or configure nginx.conf nobody
/usr/local/nginx/sbin/nginx      #启动nginx#
#
#this is for install keepalived bash
#
#cd $software_dir
tar -zxf keepalived-*.tar.gz -C $tar_dir
cd /usr/src/keepalived-*
./configure --prefix=$keepalived_dir --sysconf=/etc --with-kernel-dir=/usr/src/kernels/$kernel*
make && make installcp /usr/local/keepalived/sbin/keepalived /usr/sbin
cp /usr/local/keepalived/bin/genhash /usr/sbin/
/etc/init.d/keepalived restart

3、keepalived配置文件

! Configuration File for keepalivedglobal_defs {notification_email {mds@cdpc.com}notification_email_from master@cdpc.comsmtp_server 127.0.0.1smtp_connect_timeout 30router_id httpd
}vrrp_script check_http {script "/root/bash/check_httpd.sh"weight -5interval 1}vrrp_instance VI_1 {state BACKUPinterface eth0virtual_router_id 240priority 98advert_int 1track_script {check_http}authentication {auth_type PASSauth_pass 3333}virtual_ipaddress {192.168.80.200/24 dev eth0}
}

4、check_httpd.sh监测脚本

#!/bin/bashCHECK_TIME=2check()
{curl http://127.0.0.1/ >/dev/null 2>&1ret=$?if [ $ret -ne 0 ];thenreturn $ret;fi
}
while [ $CHECK_TIME -ne 0 ]
dolet "CHECK_TIME -= 1"checkHTTP_OK=$?if [ $HTTP_OK -eq 0 ];thenexit 0fiif [ $HTTP_OK -ne 0 ] &&  [ $CHECK_TIME -eq 0 ]thenexit 1fi
done