Nginx+keepalived做双机热备加tomcat负载均衡

nginx1:192.168.2.47
nginx2:192.168.2.48
tomcat1:192.168.2.49
tomcat2:192.168.2.50
vip:192.168.2.51

tar -zxvf pcre-8.10.tar.gz
cd pcre-8.10
./configure
make
make install

groupadd www
useradd -g www www
tar zxvf nginx-0.8.52.tar.gz
cd nginx-0.8.52/
./configure --user=www --group=www --prefix=/usr/local/nginx --with-http_stub_status_module --with-http_ssl_module
make
make install

./configure: error: SSL modules require the OpenSSL library.
Centos需要安装openssl-devel
Ubuntu则需要安装:sudo apt-get install libssl-dev

user  www www;
worker_processes 2;
pid        logs/nginx.pid;
worker_rlimit_nofile 51200;
 
events
{
 use epoll;
 worker_connections 51200;
}
 
http
{
 include       mime.types;
 default_type  application/octet-stream;
 keepalive_timeout 120;
 server_tokens off;
 send_timeout 60;
 tcp_nodelay on;
 
 upstream  tomcats  {
 server 192.168.2.50:8080;
 server 192.168.2.49:8080;
 #ip_hash;       #在没有做共享session的情况下ip_hash可以解决session问题
 
 }
 
 server
 {
 listen  80;
 server_name  192.168.2.48;
 
 location / {
 proxy_pass        http://tomcats;
 proxy_set_header   Host             $host;
 proxy_set_header   X-Real-IP        $remote_addr;
 proxy_set_header   X-Forwarded-For  $proxy_add_x_forwarded_for;
 }
 
 log_format access_log  '$remote_addr - $remote_user [$time_local] $request '
 '"$status" $body_bytes_sent "$http_referer" '
 '"$http_user_agent" "$http_x_forwarded_for"';
 access_log  /usr/local/nginx/logs/access.log  access_log;
 }
 
}

/usr/local/nginx/sbin/nginx -t

/usr/local/nginx/sbin/nginx: error while loading shared libraries: libpcre.so.0: or directory

sudo ln -s /usr/local/lib/libpcre.so.0 /usr/lib/libpcre.so.0

the configuration file /usr/local/nginx/conf/nginx.conf syntax is ok
configuration file /usr/local/nginx/conf/nginx.conf test is successful

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_tw_recycle = 1
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_mem = 94500000 915000000 927000000
net.ipv4.tcp_max_orphans = 3276800
net.ipv4.ip_local_port_range = 1024  65535

sysctl -p

#!/bin/bash
PATH_LOGS="/usr/local/nginx/logs"
YEAR=`date -d "-1 days" +"%Y"`
MONTH=`date -d "-1 days" +"%m"`
mkdir -p $PATH_LOGS/$YEAR/$MONTH
mv $PATH_LOGS/access.log $PATH_LOGS/$YEAR/$MONTH/access_$(date -d "-1 days" +"%Y%m%d").log
kill -USR1 `cat $PATH_LOGS/nginx.pid`

configure: error: Popt libraries is required

tar -zxvf popt-1.16.tar.gz
cd popt-1.16
./configure
make
make install

tar -zxvf keepalived-1.1.19.tar.gz
cd keepalived-1.1.19
./configure --prefix=/usr/local/keepalived
make
make install

! Configuration File for keepalived
 
global_defs {
 router_id LVS_DEVEL
}
vrrp_script Monitor_Nginx {
 script "/root/scripts/monitor_nginx.sh" #根据自己的实际路径放置monitor_nginx.sh    
 interval 2
 weight 2
}
vrrp_instance VI_1 {
 state MASTER
 interface eth0
 virtual_router_id 51
 priority 100
 advert_int 1
 authentication {
 auth_type PASS
 auth_pass 1234
}
 track_script {
 Monitor_Nginx
}
 virtual_ipaddress {
 192.168.2.51
 }
}

#!/bin/bash
if [ "$(ps -ef | grep "nginx: master process"| grep -v grep )" == "" ]
then
 /usr/local/nginx/sbin/nginx
 sleep 5
 if [ "$(ps -ef | grep "nginx: master process"| grep -v grep )" == "" ]
 then
 killall keepalived
 fi
fi

/usr/local/keepalived/sbin/keepalived -D -f /usr/local/keepalived/etc/keepalived/keepalived.conf

! Configuration File for keepalived
 
global_defs {
 router_id LVS_DEVEL
}
vrrp_script Monitor_Nginx {
 script "/root/scripts/monitor_nginx.sh"
 interval 2
 weight 2
}
vrrp_instance VI_1 {
 state BACKUP            #改为BACKUP
 interface eth0
 virtual_router_id 51
 priority 100            #比MASTER数值要低
 advert_int 1
 authentication {
 auth_type PASS
 auth_pass 1234
}
 track_script {
 Monitor_Nginx
}
 virtual_ipaddress {
 192.168.2.51
 }
}

Keepalived_vrrp: VRRP_Instance(VI_1) Transition to MASTER STATE
Keepalived_vrrp: VRRP_Instance(VI_1) Entering MASTER STATE
Keepalived_vrrp: VRRP_Instance(VI_1) setting protocol VIPs.
Keepalived_vrrp: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 192.168.2.51

Keepalived_vrrp: Terminating VRRP child process on signal
Keepalived_vrrp: VRRP_Instance(VI_1) removing protocol VIPs.

Keepalived_vrrp: VRRP_Instance(VI_1) Received higher prio advert
Keepalived_vrrp: VRRP_Instance(VI_1) Entering BACKUP STATE
Keepalived_vrrp: VRRP_Instance(VI_1) removing protocol VIPs.

Keepalived_vrrp: VRRP_Script(Monitor_Nginx) succeeded
Keepalived_vrrp: VRRP_Instance(VI_1) Transition to MASTER STATE
Keepalived_vrrp: VRRP_Instance(VI_1) Entering MASTER STATE
Keepalived_vrrp: VRRP_Instance(VI_1) setting protocol VIPs.
Keepalived_vrrp: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 192.168.2.51