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高可用集群部署文档
目录：
项目需求：
1.两台WEB/J2EE应用服务器同时提供服务，且负载均衡，当一台服务器当机时，另一台继续提供服务。
2..两台MYSQL数据库实时同步，保证数据一致性及完整性。
实现方式：
lvs + keepalived + nginx + tomcat + redis + mysql
1.使用lvs+Keepalived集群
LVS的通过控制IP来实现负载均衡。IPVS是其具体的实现模块。IPVS的主要作用：安装在Director Server上面，在Director Server虚拟一个对外访问的IP（VIP）。用户访问VIP，到达Director Server，Director Server根据一定的规则选择一个Real Server，处理完成后然后返回给客户端数据。使用lvs+Keepalived集群技术( DR模式 )让两台WEB/J2EE服务器实现负载均衡和高可用。
2.redis一主一从，实现会话保持
redis主从复制，保证session不丢失，实现会话保持。当用户往Master端写入数据时，通过Redis Sync机制将数据文件发送至Slave，Slave也会执行相同的操作确保数据一致。
3.使用MysqlMHA高可用
MysqlMHA是一套优秀的作为MySQL高可用性环境下故障切换和主从提升的高可用软件。在MySQL故障切换过程中，MHA能做到0~30秒之内自动完成数据库的故障切换操作，并且在进行故障切换的过程中，MHA能最大程度上保证数据库的一致性，以达到真正意义上的高可用。使用MysqlMHA高可用建立稳定的mysql数据库集群，可以随时切换mysql数据库
4.nginx + tomcat实现页面访问
现公司使用的即是前端nginx +后端 tomcat 访问网站
拓扑图：
系统及软件版本：
|
系统 |
CentOS 5.6 X86-64 |
kernel |
2.6.18-238.el5 |
|
LVS |
1.2.1 |
keepalived |
1.2.13 |
|
mysql |
5.1.73 |
mysqlMHA |
manager-0.55 |
|
nginx |
1.6.2 |
tomcat |
6.0.44 |
|
jdk |
jdk-6u41-linux-amd64 |
redis |
2.8.19 |
安装步骤：
系统分区及安装：
最小化安装，并修复bash漏洞，openssl心脏流血漏洞，glibc幽灵漏洞。
修复系统漏洞略，系统安装略。
IP分配：
|
LVS主 |
192.168.3.1 |
LVS备 |
192.168.3.2 |
|
LVS VIP |
192.168.3.100 |
MHA VIP |
192.168.3.80 |
|
web1 |
192.168.3.3 |
web2 |
192.168.3.4 |
|
Mysql主 |
192.168.3.5 |
Mysql备 |
192.168.3.6 |
LVS和keepalived的安装和配置：
LVS主配置：
setenforce 0
vim /etc/sysconfig/selinux
yum install -y ipvsadm
wget http://mirrors.opencas.cn/epel/5/x86_64/epel-release-5-4.noarch.rpm
rpm -ivh epel-release-5-4.noarch.rpm
yum install gcc gcc-c++ vim wget lrzsz ntpdate sysstat dstat wget man tree popt popt-devel popt-static libnl libnl-devel openssl* -y
yum install kernel-devel
tar -xzf keepalived-1.2.13.tar.gz
cd keepalived-1.2.13
./configure –prefix=/usr/local/keepalived –disable-fwmark
cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/
chmod +x /etc/rc.d/init.d/keepalived
mkdir /etc/keepalived
cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/
cp /etc/keepalived/keepalived.conf{,.bak}
sed -i 's/net\.ipv4\.ip\_forward\ \=\ 0/net\.ipv4\.ip\_forward\ \=\ 1/' /etc/sysctl.conf
service keepalived restart
ipvsadm -ln
# vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
sysadmin@firewall.loc
}
notification_email_from Alexandre.Cassen@firewall.loc
smtp_server 192.168.200.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_sync_group LVS_DEVEL {
group {
VI_1
}
}
vrrp_instance VI_1 {
state MASTER
interface eth0
lvs_sync_daemon_interface eth0
garp_master_delay 5
virtual_router_id 99
priority 151
advert_int 1
authentication {
auth_type PASS
auth_pass 1234567
}
virtual_ipaddress {
192.168.3.100
}
track_interface {
eth0
}
}
virtual_server 192.168.3.100 80 {
delay_loop 2
lb_algo wrr
lb_kind DR
nat_mask 255.255.255.0
# persistence_timeout 3
protocol TCP
real_server 192.168.3.3 80 {
weight 1
TCP_CHECK {
connect_timeout 2
nb_get_retry 3
delay_before_retry 2
connect_port 80
}
}
real_server 192.168.3.4 80 {
weight 1
TCP_CHECK {
connect_timeout 2
nb_get_retry 3
delay_before_retry 2
connect_port 80
}
}
}
service keepalived start
tail -f /var/log/messages
LVS1 日志：
Jul 7 10:58:03 dr1 Keepalived_vrrp[3645]: Opening file '/etc/keepalived/keepalived.conf'.
Jul 7 10:58:03 dr1 Keepalived_vrrp[3645]: Configuration is using : 66961 Bytes
Jul 7 10:58:03 dr1 Keepalived_vrrp[3645]: Using LinkWatch kernel netlink reflector…
Jul 7 10:58:03 dr1 kernel: IPVS: sync thread started: state = MASTER, mcast_ifn = eth0, syncid = 99
Jul 7 10:58:03 dr1 Keepalived_vrrp[3645]: VRRP sockpool: [ifindex(2), proto(112), unicast(0), fd(11,12)]
Jul 7 10:58:04 dr1 Keepalived_vrrp[3645]: VRRP_Instance(VI_1) Transition to MASTER STATE
Jul 7 10:58:05 dr1 Keepalived_vrrp[3645]: VRRP_Instance(VI_1) Entering MASTER STATE
Jul 7 10:58:05 dr1 Keepalived_vrrp[3645]: VRRP_Instance(VI_1) setting protocol VIPs.
Jul 7 10:58:05 dr1 Keepalived_vrrp[3645]: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 192.168.3.100
Jul 7 10:58:05 dr1 Keepalived_vrrp[3645]: IPVS: No daemon is running
Jul 7 10:58:05 dr1 Keepalived_vrrp[3645]: IPVS: Daemon has already run
Jul 7 10:58:05 dr1 Keepalived_vrrp[3645]: VRRP_Group(LVS_DEVEL) Syncing instances to MASTER state
Jul 7 10:58:05 dr1 Keepalived_vrrp[3645]: Netlink reflector reports IP 192.168.3.100 added
Jul 7 10:58:05 dr1 Keepalived_healthcheckers[3644]: Netlink reflector reports IP 192.168.3.100 added
Jul 7 10:58:05 dr1 avahi-daemon[3312]: Registering new address record for 192.168.3.100 on eth0.
Jul 7 10:58:10 dr1 Keepalived_vrrp[3645]: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 192.168.3.100
iptables设置
iptables -A INPUT -p udp -m udp –dport 3478 -j ACCEPT
iptables -A OUTPUT -p udp -m udp –sport 3478 -j ACCEPT
iptables -A INPUT -p tcp -m tcp –dport 3478 -j ACCEPT
iptables -A OUTPUT -p tcp -m tcp –sport 3478 -j ACCEPT
iptables -A INPUT -p tcp -m tcp –dport 80 -j ACCEPT
iptables -A OUTPUT -p tcp -m tcp –sport 80 -j ACCEPT
iptables -I INPUT -i eth0 -d 224.0.0.0/8 -j ACCEPT
iptables -A INPUT -i eth0 -p vrrp -j ACCEPT
iptables -A OUTPUT -o eth0 -p vrrp -j ACCEPT
LVS2备 配置：
setenforce 0
vim /etc/sysconfig/selinux
yum install -y ipvsadm
wget http://mirrors.opencas.cn/epel/5/x86_64/epel-release-5-4.noarch.rpm
rpm -ivh epel-release-5-4.noarch.rpm
yum install gcc gcc-c++ vim wget lrzsz ntpdate sysstat dstat wget man tree popt popt-devel popt-static libnl libnl-devel openssl* -y
tar -xzf keepalived-1.2.13.tar.gz
cd keepalived-1.2.13
./configure –prefix=/usr/local/keepalived –disable-fwmark
cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/
chmod +x /etc/rc.d/init.d/keepalived
mkdir /etc/keepalived
cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/
cp /etc/keepalived/keepalived.conf{,.bak}
sed -i 's/net\.ipv4\.ip\_forward\ \=\ 0/net\.ipv4\.ip\_forward\ \=\ 1/' /etc/sysctl.conf
service keepalived restart
vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
sysadmin@firewall.loc
}
notification_email_from Alexandre.Cassen@firewall.loc
smtp_server 192.168.200.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_sync_group LVS_DEVEL {
group {
VI_1
}
}
vrrp_instance VI_1 {
state SLAVE
interface eth0
lvs_sync_daemon_interface eth0
garp_master_delay 5
virtual_router_id 99
priority 150
advert_int 1
authentication {
auth_type PASS
auth_pass 1234567
}
virtual_ipaddress {
192.168.3.100
}
track_interface {
eth0
}
}
virtual_server 192.168.3.100 80 {
delay_loop 2
lb_algo wrr
lb_kind DR
nat_mask 255.255.255.0
# persistence_timeout 3
protocol TCP
real_server 192.168.3.3 80 {
weight 1
TCP_CHECK {
connect_timeout 2
nb_get_retry 3
delay_before_retry 2
connect_port 80
}
}
real_server 192.168.3.4 80 {
weight 1
TCP_CHECK {
connect_timeout 2
nb_get_retry 3
delay_before_retry 2
connect_port 80
}
}
}
service keepalived start
tail -f /var/log/messages
LVS2 日志：
Jul 7 10:58:23 dr2 Keepalived_healthcheckers[3634]: Opening file '/etc/keepalived/keepalived.conf'.
Jul 7 10:58:23 dr2 Keepalived_healthcheckers[3634]: Configuration is using : 14654 Bytes
Jul 7 10:58:23 dr2 Keepalived_healthcheckers[3634]: Using LinkWatch kernel netlink reflector…
Jul 7 10:58:23 dr2 Keepalived_healthcheckers[3634]: Activating healthchecker for service [192.168.3.3]:80
Jul 7 10:58:23 dr2 Keepalived_healthcheckers[3634]: Activating healthchecker for service [192.168.3.4]:80
Jul 7 10:58:23 dr2 Keepalived_vrrp[3635]: Opening file '/etc/keepalived/keepalived.conf'.
Jul 7 10:58:23 dr2 Keepalived_vrrp[3635]: Configuration is using : 66959 Bytes
Jul 7 10:58:23 dr2 Keepalived_vrrp[3635]: Using LinkWatch kernel netlink reflector…
Jul 7 10:58:23 dr2 kernel: IPVS: sync thread started: state = BACKUP, mcast_ifn = eth0, syncid = 99
Jul 7 10:58:23 dr2 Keepalived_vrrp[3635]: VRRP_Instance(VI_1) Entering BACKUP STATE
Jul 7 10:58:23 dr2 Keepalived_vrrp[3635]: VRRP sockpool: [ifindex(2), proto(112), unicast(0), fd(11,12)]
web服务器配置
yum install gcc gcc-c++ vim wget lrzsz ntpdate sysstat dstat wget man tree -y
chmod 755 jdk-6u41-linux-x64-rpm.bin
./jdk-6u41-linux-x64-rpm.bin
yum install openssl openssl-devel
java -version
tar -xzf apache-tomcat-6.0.44.tar.gz -C /usr/local/
cd /usr/local/
mv apache-tomcat-6.0.44/ tomcat
tar -zxf pcre-8.35.tar.gz
cd pcre-8.35
./configure –prefix=/usr/local/pcre
make &&make install &&cd ..
groupadd www
useradd -g www www -s /sbin/nologin
tar -xzf nginx-1.6.2.tar.gz
cd nginx-1.6.2
./configure –user=www –group=www –prefix=/usr/local/nginx –with-http_stub_status_module –with-http_gzip_static_module –with-pcre=/root/pcre-8.35 –with-http_realip_module
make -j4
make install
cd /usr/local/tomcat/conf
cp context.xml context.xml.def
vim /usr/local/tomcat/conf/context.xml
<?xml version='1.0' encoding='utf-8'?>
<Context>
<!– Default set of monitored resources –>
<WatchedResource>WEB-INF/web.xml</WatchedResource>
<Valve className="com.radiadesign.catalina.session.RedisSessionHandlerValve" />
<Manager className="com.radiadesign.catalina.session.RedisSessionManager"
host="192.168.3.3"
port="6379"
database="0"
maxInactiveInterval="60" />
</Context>
tar -xzf redis-2.8.19.tar.gz
make -j4
make install
cp redis.conf /etc/
vim /etc/redis.conf
/usr/local/bin/redis-server /etc/redis.conf &
vim /usr/local/tomcat/webapps/ROOT/test.jsp
<%@ page language="java" %>
<html>
<head><title>TomcatA</title></head>
<body>
<h1><font color="blue">192.168.3.3:8080 Tomcat1 </h1>
<table align="centre" border="1">
<tr>
<td>Session ID</td>
<% session.setAttribute("abc","abc"); %>
<td><%= session.getId() %></td>
</tr>
<tr>
<td>Created on</td>
<td><%= session.getCreationTime() %></td>
</tr>
</table>
</body>
</html>
/usr/local/tomcat/bin/catalina.sh start
grep -v "^.*#" /usr/local/nginx/conf/nginx.conf|sed '/^$/d'
worker_processes 1;
events {
worker_connections 1024;
}
http {
include mime.types;
default_type application/octet-stream;
sendfile on;
keepalive_timeout 65;
upstream mycluser {
server 192.168.3.3:8080;
}
server {
listen 80;
server_name localhost;
location / {
root html;
index index.html index.htm index.jsp;
proxy_pass http://mycluser;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header Host $host;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_redirect off;
}
error_page 500 502 503 504 /50x.html;
location = /50x.html {
root html;
}
}
}
/usr/local/nginx/sbin/nginx
/usr/local/bin/redis-server /etc/redis.conf &
web2服务器需 vim /etc/redis.conf
slaveof 192.168.3.3 6379
编辑脚本并启动：
vim realserver.sh
#!/bin/bash
#
# Script to start LVS DR real server.
# description: LVS DR real server
#
. /etc/rc.d/init.d/functions
VIP=192.168.3.100
host=`/bin/hostname`
case "$1" in
start)
# Start LVS-DR real server on this machine.
/sbin/ifconfig lo down
/sbin/ifconfig lo up
echo 1 > /proc/sys/net/ipv4/conf/lo/arp_ignore
echo 2 > /proc/sys/net/ipv4/conf/lo/arp_announce
echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore
echo 2 > /proc/sys/net/ipv4/conf/all/arp_announce
/sbin/ifconfig lo:0 $VIP broadcast $VIP netmask 255.255.255.255 up
/sbin/route add -host $VIP dev lo:0
;;
stop)
# Stop LVS-DR real server loopback device(s).
/sbin/ifconfig lo:0 down
echo 0 > /proc/sys/net/ipv4/conf/lo/arp_ignore
echo 0 > /proc/sys/net/ipv4/conf/lo/arp_announce
echo 0 > /proc/sys/net/ipv4/conf/all/arp_ignore
echo 0 > /proc/sys/net/ipv4/conf/all/arp_announce
;;
status)
# Status of LVS-DR real server.
islothere=`/sbin/ifconfig lo:0 | grep $VIP`
isrothere=`netstat -rn | grep "lo:0" | grep $VIP`
if [ ! "$islothere" -o ! "isrothere" ];then
# Either the route or the lo:0 device
# not found.
echo "LVS-DR real server Stopped."
else
echo "LVS-DR real server Running."
fi
;;
*)
# Invalid entry.
echo "$0: Usage: $0 {start|status|stop}"
exit 1
;;
esac
iptables设置：
iptables -A INPUT -p udp -m udp –dport 3478 -j ACCEPT
iptables -A OUTPUT -p udp -m udp –sport 3478 -j ACCEPT
iptables -A INPUT -p tcp -m tcp –dport 3478 -j ACCEPT
iptables -A OUTPUT -p tcp -m tcp –sport 3478 -j ACCEPT
iptables -A INPUT -p tcp -m tcp –dport 80 -j ACCEPT
iptables -A OUTPUT -p tcp -m tcp –sport 80 -j ACCEPT
Mysql-MHA高可用：
|
Hostname |
Ip |
主机说明 |
|
manager |
192.168.3.7 |
管理端 |
|
db1 |
192.168.3.5 |
现有主库 |
|
db2 |
192.168.3.6 |
备用主库 |
|
VIP 192.168.3.80 |
Mysql主配置：
安装mysql：
yum -y install ncurses*
/usr/sbin/groupadd mysql
/usr/sbin/useradd -g mysql mysql
chown -R mysql.mysql /var/mysql/data
chown -R mysql.mysql /var/log/mysql
cd mysql-5.1.73
yum -y install libtool
./configure –prefix=/usr/local/mysql/ –with-server-suffix=-junsansi-edition –enable-assembler –enable-local-infile –enable-thread-safe-client –with-big-tables –with-charset=utf8 –with-extra-charsets=gbk,gb2312,utf8,ascii –with-readline –with-ssl –with-embedded-server –with-pthread –with-mysqld-user=mysql –with-mysqld-ldflags=-all-static –with-client-ldflags=-all-static –with-plugins=partition,innobase,innodb_plugin
make
make install
cp support-files/mysql.server /etc/init.d/mysqld
chmod 755 /etc/init.d/mysqld
vim /etc/my.cnf
[mysqld]
datadir=/var/mysql/data
socket=/var/log/mysql/mysql.sock
user=mysql
# Default to using old password format for compatibility with mysql 3.x
# clients (those using the mysqlclient10 compatibility package).
old_passwords=1
# Disabling symbolic-links is recommended to prevent assorted security risks;
# to do so, uncomment this line:
# symbolic-links=0
[mysqld_safe]
log-error=/var/log/mysql/mysqld.log
pid-file=/var/log/mysql/mysqld.pid
/usr/local/mysql/bin/mysql_install_db –user=mysql –datadir=/var/mysql/data/ –basedir=/usr/local/mysql –log-output=file
service mysqld start
db1现有主库操作：
ssh-keygen -t rsa
ssh-copy-id -i ~/.ssh/id_rsa.pub root@192.168.23.7
ssh-copy-id -i ~/.ssh/id_rsa.pub root@192.168.23.6
mysql -uroot -p
grant replication slave on *.* to mharep@'192.168.3.%' identified by 'passwd';
grant all privileges on *.* to 'mha_manager'@'192.168.3.%' identified by '123456';
flush privileges;
\q
rpm -ivh perl-DBD-MySQL-3.0007-2.el5.x86_64.rpm
rpm -ivh mha4mysql-node-0.54-1.el5.noarch.rpm
db2备用主库操作：
ssh-keygen -t rsa
ssh-copy-id -i ~/.ssh/id_rsa.pub root@192.168.23.5
ssh-copy-id -i ~/.ssh/id_rsa.pub root@192.168.23.7
#ntpdate 132.163.4.101
rpm -ivh perl-DBD-MySQL-3.0007-2.el5.x86_64.rpm
rpm -ivh mha4mysql-node-0.54-1.el5.noarch.rpm
/etc/my.cnf
#character-set-server=utf8
server-id=2
log-bin=mysql-bin
binlog_format=mixed
relay_log_purge=0 #最好添加此选项
mysql -uroot -p
reset master;
reset slave;
grant replication slave on *.* to mharep@'192.168.3.%' identified by 'passwd';
grant all privileges on *.* to 'mha_manager'@'192.168.3.%' identified by '123456';
flush privileges;
slave stop;
change master to MASTER_HOST='192.168.3.5', MASTER_PORT=3306,MASTER_USER='mharep', MASTER_PASSWORD='passwd',master_log_file='mysql-bin.000001', master_log_pos=107;
slave start;
show slave status\G;
\q
manager管理端操作：
ssh-keygen -t rsa
ssh-copy-id -i ~/.ssh/id_rsa.pub root@192.168.23.5
ssh-copy-id -i ~/.ssh/id_rsa.pub root@192.168.23.6
ntpdate 132.163.4.101
yum install perl cpan -y
yum install perl-DBD-MySQL perl-Config-Tiny perl-Log-Dispatch perl-Parallel-ForkManager -y
rpm -ivh perl-Mail-Sender-0.8.16-1.el6.rf.noarch.rpm
rpm -ivh perl-Mail-Sendmail-0.79-1.2.el6.rf.noarch.rpm
yum localinstall perl-Log-Dispatch-2.26-1.el6.rf.noarch.rpm -y
yum localinstall perl-Parallel-ForkManager-0.7.5-2.2.el6.rf.noarch.rpm -y
yum localinstall mha4mysql-node-0.54-1.el5.noarch.rpm -y
yum localinstall mha4mysql-manager-0.55-1.el5.noarch.rpm -y
yum localinstall perl-Net-Telnet-3.03-2.el6.rfx.noarch.rpm -y
tar -xzf mha4mysql-manager-0.55.tar.gz
mkdir -p /usr/local/mha/scripts
cp mha4mysql-manager-0.55/samples/scripts/* /usr/local/mha/scripts
cat >> /usr/local/mha/mha.conf << EOF
[server default]
user=mha_manager
password=123456
manager_workdir=/usr/local/mha
manager_log=/usr/local/mha/manager.log
remote_workdir=/usr/local/mha
ssh_user=root
repl_user=mharep
repl_password=passwd
ping_interval=1
#下面是mysql检测设置
secondary_check_script= masterha_secondary_check -s 192.168.3.5 -s 192.168.3.6
#master_ip_failover_script=/usr/local/mha/scripts/master_ip_failover
#shutdown_script= /usr/local/mha/scripts/power_manager
report_script= /usr/local/mha/scripts/send_report
master_ip_online_change_script= /usr/local/mha/scripts/master_ip_online_change
[server1]
hostname=192.168.3.5
ssh_port=22
master_binlog_dir=/var/mysql/log #binlog_dir目录必须正确
candidate_master=1
[server2]
hostname=192.168.3.6
ssh_port=22
master_binlog_dir=/var/mysql/log
candidate_master=1
EOF
masterha_check_ssh –conf=/usr/local/mha/mha.conf
masterha_check_repl –conf=/usr/local/mha/mha.conf
mv /usr/local/mha/scripts/master_ip_failover /usr/local/mha/scripts/master_ip_failover.def
cp master_ip_failover /usr/local/mha/scripts/master_ip_failover
chmod 755 /usr/local/mha/scripts/master_ip_failover
sed -i 's/#master_ip_failover_script/master_ip_failover_script/' /usr/local/mha/mha.conf
VIP切换：
masterha_check_repl –conf=/usr/local/mha/mha.conf
nohup masterha_manager –conf=/usr/local/mha/mha.conf > /tmp/mha_manager.log < /dev/null 2>&1 &
masterha_check_status –conf=/usr/local/mha/mha.conf
masterha_stop –conf=/usr/local/mha/mha.conf
masterha_master_switch –conf=/usr/local/mha/mha.conf –master_state=alive –new_master_host=192.168.23.6 –new_master_port=3306 –orig_master_is_new_slave –running_updates_limit=10000
vim master_ip_online_change
#!/usr/bin/env perl
# Copyright (C) 2011 DeNA Co.,Ltd.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
## Note: This is a sample script and is not complete. Modify the script based on your environment.
use strict;
use warnings FATAL => 'all';
use Getopt::Long;
use MHA::DBHelper;
use MHA::NodeUtil;
use Time::HiRes qw( sleep gettimeofday tv_interval );
use Data::Dumper;
my $_tstart;
my $_running_interval = 0.1;
my (
$command, $orig_master_host, $orig_master_ip,
$orig_master_port, $orig_master_user,
$new_master_host, $new_master_ip, $new_master_port,
$new_master_user,
);
my $vip = '192.168.3.80/24'; # Virtual IP
my $key = "1";
my $ssh_start_vip = "/sbin/ifconfig eth1:$key $vip";
my $ssh_stop_vip = "/sbin/ifconfig eth1:$key down";
my $ssh_user = "root";
my $new_master_password='123456';
my $orig_master_password='123456';
GetOptions(
'command=s' => \$command,
#'ssh_user=s' => \$ssh_user,
'orig_master_host=s' => \$orig_master_host,
'orig_master_ip=s' => \$orig_master_ip,
'orig_master_port=i' => \$orig_master_port,
'orig_master_user=s' => \$orig_master_user,
#'orig_master_password=s' => \$orig_master_password,
'new_master_host=s' => \$new_master_host,
'new_master_ip=s' => \$new_master_ip,
'new_master_port=i' => \$new_master_port,
'new_master_user=s' => \$new_master_user,
#'new_master_password=s' => \$new_master_password,
);
exit &main();
sub current_time_us {
my ( $sec, $microsec ) = gettimeofday();
my $curdate = localtime($sec);
return $curdate . " " . sprintf( "%06d", $microsec );
}
sub sleep_until {
my $elapsed = tv_interval($_tstart);
if ( $_running_interval > $elapsed ) {
sleep( $_running_interval – $elapsed );
}
}
sub get_threads_util {
my $dbh = shift;
my $my_connection_id = shift;
my $running_time_threshold = shift;
my $type = shift;
$running_time_threshold = 0 unless ($running_time_threshold);
$type = 0 unless ($type);
my @threads;
my $sth = $dbh->prepare("SHOW PROCESSLIST");
$sth->execute();
while ( my $ref = $sth->fetchrow_hashref() ) {
my $id = $ref->{Id};
my $user = $ref->{User};
my $host = $ref->{Host};
my $command = $ref->{Command};
my $state = $ref->{State};
my $query_time = $ref->{Time};
my $info = $ref->{Info};
$info =~ s/^\s*(.*?)\s*$/$1/ if defined($info);
next if ( $my_connection_id == $id );
next if ( defined($query_time) && $query_time < $running_time_threshold );
next if ( defined($command) && $command eq "Binlog Dump" );
next if ( defined($user) && $user eq "system user" );
next
if ( defined($command)
&& $command eq "Sleep"
&& defined($query_time)
&& $query_time >= 1 );
if ( $type >= 1 ) {
next if ( defined($command) && $command eq "Sleep" );
next if ( defined($command) && $command eq "Connect" );
}
if ( $type >= 2 ) {
next if ( defined($info) && $info =~ m/^select/i );
next if ( defined($info) && $info =~ m/^show/i );
}
push @threads, $ref;
}
return @threads;
}
sub main {
if ( $command eq "stop" ) {
## Gracefully killing connections on the current master
# 1. Set read_only= 1 on the new master
# 2. DROP USER so that no app user can establish new connections
# 3. Set read_only= 1 on the current master
# 4. Kill current queries
# * Any database access failure will result in script die.
my $exit_code = 1;
eval {
## Setting read_only=1 on the new master (to avoid accident)
my $new_master_handler = new MHA::DBHelper();
# args: hostname, port, user, password, raise_error(die_on_error)_or_not
$new_master_handler->connect( $new_master_ip, $new_master_port,
$new_master_user, $new_master_password, 1 );
print current_time_us() . " Set read_only on the new master.. ";
$new_master_handler->enable_read_only();
if ( $new_master_handler->is_read_only() ) {
print "ok.\n";
}
else {
die "Failed!\n";
}
$new_master_handler->disconnect();
# Connecting to the orig master, die if any database error happens
my $orig_master_handler = new MHA::DBHelper();
$orig_master_handler->connect( $orig_master_ip, $orig_master_port,
$orig_master_user, $orig_master_password, 1 );
## Drop application user so that nobody can connect. Disabling per-session binlog beforehand
#$orig_master_handler->disable_log_bin_local();
#print current_time_us() . " Drpping app user on the orig master..\n";
#FIXME_xxx_drop_app_user($orig_master_handler);
## Waiting for N * 100 milliseconds so that current connections can exit
my $time_until_read_only = 15;
$_tstart = [gettimeofday];
my @threads = get_threads_util( $orig_master_handler->{dbh},
$orig_master_handler->{connection_id} );
while ( $time_until_read_only > 0 && $#threads >= 0 ) {
if ( $time_until_read_only % 5 == 0 ) {
printf
"%s Waiting all running %d threads are disconnected.. (max %d milliseconds)\n",
current_time_us(), $#threads + 1, $time_until_read_only * 100;
if ( $#threads < 5 ) {
print Data::Dumper->new( [$_] )->Indent(0)->Terse(1)->Dump . "\n"
foreach (@threads);
}
}
sleep_until();
$_tstart = [gettimeofday];
$time_until_read_only–;
@threads = get_threads_util( $orig_master_handler->{dbh},
$orig_master_handler->{connection_id} );
}
## Setting read_only=1 on the current master so that nobody(except SUPER) can write
print current_time_us() . " Set read_only=1 on the orig master.. ";
$orig_master_handler->enable_read_only();
if ( $orig_master_handler->is_read_only() ) {
print "ok.\n";
}
else {
die "Failed!\n";
}
## Waiting for M * 100 milliseconds so that current update queries can complete
my $time_until_kill_threads = 5;
@threads = get_threads_util( $orig_master_handler->{dbh},
$orig_master_handler->{connection_id} );
while ( $time_until_kill_threads > 0 && $#threads >= 0 ) {
if ( $time_until_kill_threads % 5 == 0 ) {
printf
"%s Waiting all running %d queries are disconnected.. (max %d milliseconds)\n",
current_time_us(), $#threads + 1, $time_until_kill_threads * 100;
if ( $#threads < 5 ) {
print Data::Dumper->new( [$_] )->Indent(0)->Terse(1)->Dump . "\n"
foreach (@threads);
}
}
sleep_until();
$_tstart = [gettimeofday];
$time_until_kill_threads–;
@threads = get_threads_util( $orig_master_handler->{dbh},
$orig_master_handler->{connection_id} );
}
print "Disabling the VIP on old master: $orig_master_host \n";
&stop_vip();
## Terminating all threads
print current_time_us() . " Killing all application threads..\n";
$orig_master_handler->kill_threads(@threads) if ( $#threads >= 0 );
print current_time_us() . " done.\n";
#$orig_master_handler->enable_log_bin_local();
$orig_master_handler->disconnect();
## After finishing the script, MHA executes FLUSH TABLES WITH READ LOCK
$exit_code = 0;
};
if ($@) {
warn "Got Error: $@\n";
exit $exit_code;
}
exit $exit_code;
}
elsif ( $command eq "start" ) {
## Activating master ip on the new master
# 1. Create app user with write privileges
# 2. Moving backup script if needed
# 3. Register new master's ip to the catalog database
# We don't return error even though activating updatable accounts/ip failed so that we don't interrupt slaves' recovery.
# If exit code is 0 or 10, MHA does not abort
my $exit_code = 10;
eval {
my $new_master_handler = new MHA::DBHelper();
# args: hostname, port, user, password, raise_error_or_not
$new_master_handler->connect( $new_master_ip, $new_master_port,
$new_master_user, $new_master_password, 1 );
## Set read_only=0 on the new master
#$new_master_handler->disable_log_bin_local();
print current_time_us() . " Set read_only=0 on the new master.\n";
$new_master_handler->disable_read_only();
## Creating an app user on the new master
#print current_time_us() . " Creating app user on the new master..\n";
#FIXME_xxx_create_app_user($new_master_handler);
#$new_master_handler->enable_log_bin_local();
$new_master_handler->disconnect();
## Update master ip on the catalog database, etc
print "Enabling the VIP – $vip on the new master – $new_master_host \n";
&start_vip();
$exit_code = 0;
};
if ($@) {
warn "Got Error: $@\n";
exit $exit_code;
}
exit $exit_code;
}
elsif ( $command eq "status" ) {
# do nothing
exit 0;
}
else {
&usage();
exit 1;
}
}
# A simple system call that enable the VIP on the new master
sub start_vip() {
`ssh $ssh_user\@$new_master_host \" $ssh_start_vip \"`;
}
# A simple system call that disable the VIP on the old_master
sub stop_vip() {
`ssh $ssh_user\@$orig_master_host \" $ssh_stop_vip \"`;
}
sub usage {
"Usage: master_ip_online_change –command=start|stop|status –orig_master_host=host –orig_master_ip=ip –orig_master_port=port –new_master_host=host –new_master_ip=ip –new_master_port=port\n";
die;
}
vim master_ip_failover
#!/usr/bin/env perl
use strict;
use warnings FATAL => 'all';
use Getopt::Long;
my (
$command, $ssh_user, $orig_master_host, $orig_master_ip,
$orig_master_port, $new_master_host, $new_master_ip, $new_master_port
);
my $vip = '192.168.23.80'; # Virtual IP
my $gateway = ''; #Gateway IP
my $interface = 'eth1';
my $key = "1";
my $ssh_start_vip = "/sbin/ifconfig $interface:$key $vip;/sbin/arping -I $interface -c 3 -s $vip $gateway >/dev/null 2>&1";
my $ssh_stop_vip = "/sbin/ifconfig $interface:$key down";
GetOptions(
'command=s' => \$command,
'ssh_user=s' => \$ssh_user,
'orig_master_host=s' => \$orig_master_host,
'orig_master_ip=s' => \$orig_master_ip,
'orig_master_port=i' => \$orig_master_port,
'new_master_host=s' => \$new_master_host,
'new_master_ip=s' => \$new_master_ip,
'new_master_port=i' => \$new_master_port,
);
exit &main();
sub main {
print "\n\nIN SCRIPT TEST====$ssh_stop_vip==$ssh_start_vip===\n\n";
if ( $command eq "stop" || $command eq "stopssh" ) {
# $orig_master_host, $orig_master_ip, $orig_master_port are passed.
# If you manage master ip address at global catalog database,
# invalidate orig_master_ip here.
my $exit_code = 1;
eval {
print "Disabling the VIP on old master: $orig_master_host \n";
&stop_vip();
$exit_code = 0;
};
if ($@) {
warn "Got Error: $@\n";
exit $exit_code;
}
exit $exit_code;
}
elsif ( $command eq "start" ) {
# all arguments are passed.
# If you manage master ip address at global catalog database,
# activate new_master_ip here.
# You can also grant write access (create user, set read_only=0, etc) here.
my $exit_code = 10;
eval {
print "Enabling the VIP – $vip on the new master – $new_master_host \n";
&start_vip();
$exit_code = 0;
};
if ($@) {
warn $@;
exit $exit_code;
}
exit $exit_code;
}
elsif ( $command eq "status" ) {
print "Checking the Status of the script.. OK \n";
`ssh $ssh_user\@$orig_master_host \" $ssh_start_vip \"`;
exit 0;
}
else {
&usage();
exit 1;
}
}
# A simple system call that enable the VIP on the new master
sub start_vip() {
`ssh $ssh_user\@$new_master_host \" $ssh_start_vip \"`;
}
# A simple system call that disable the VIP on the old_master
sub stop_vip() {
`ssh $ssh_user\@$orig_master_host \" $ssh_stop_vip \"`;
}
sub usage {
"Usage:
master_ip_failover –command=start|stop|stopssh|status
–orig_master_host=host –orig_master_ip=ip –orig_master_port=port
–new_master_host=host –new_master_ip=ip –new_master_port=port\n";
}
测试：
l 正常访问网站
web1服务器页面：
web2服务器页面：
lvs + keepalived VIP页面：
l 把主数据库关机或关闭网卡
1，访问页面不受影响，正常访问
2，数据库数据完整性、一致性、可用性正常
l 把web1服务器关机或关闭网卡
由于web1和web2实现了负载均衡，所以客户打开的页面内容完全一致，访问正常
l 把LVS1服务器关机或关闭网卡
1，由于2台服务器实现前端分发请求的高可用，所以LVS1主机当机，网站仍然正常访问，访问不受影响
l 打开网站，登录
在测试期间，一直刷新页面查看，在LVS1当机的时刻会有少于2秒时间无法访问网站，高可用可以达到 99.99999% ，保证网站访问不因为服务器当机而造成损失。
原创文章，作者：517766237，如若转载，请注明出处：http://www.178linux.com/6972
评论列表（2条）
义薄云天,不出手则罢，一出手就是大手笔呢！
@stanley：好久没写了，第一次在这里写，发现格式比较乱 :?: ，以后更正