架构方案： mysql （master/slave） --gtid 方式主备（pos 也可）
mycat （master/slave） --xinted 插件时间主备模式
haproxy （master/slave） --keepalived 自动切换
--keepalived和haproxy必须装在同一台机器上, keepalived负责为该服务器抢占vip（虚拟ip），抢占到vip后，对该主机的访问可以通过原来的ip（10.118.242..214）访问，也可以直接通过vip（10.118.242..212）访问。
--10.118.242..214上的keepalived也会去抢占vip，抢占vip时有优先级，配置keepalived.conf中的（priority 150 #数值愈大，优先级越高,10.118.242..216上改为120，master和slave上该值配置不同）决 定。但是一般哪台主机上的keepalived服务先启动就会抢占到vip，即使是slave，只要先启动也能抢到。
--haproxy负责将对vip的请求分发到mycat上。起到负载均衡的作用，同时haproxy也能检测到mycat是否存活，haproxy只会将请求转发到存活的mycat上。
--如果一台服务器（keepalived+haproxy服务器）宕机，另外一台上的keepalived会立刻抢占vip并接管服务。
--如果一台mycat服务器宕机，haporxy转发时不会转发到宕机的mycat上，所以mycat依然可用.
MyCAT 后面，连接的是MYSQL 数据库，这里为 ： A/B复制模式。
Haproxy + keepalived 安装在同一主机上。
mycat+xinted 安装在同一主机上。
版本： OS : redhat6.4 x86 64bit
Mysql : 5.7.15
Mycat :server-1.5.1-RELEASE
Haproxy : haproxy-1.6.2.tar.gz
keepalived : keepalived-1.2.16.tar.gz
安装之前，最好把iptables ，selinux 关闭
一： 配置本地yum 源，并安装 相应的依赖包 （这里我直接套用安装oracle依赖性包加载，一般oracle使用包，其他的软件都会包含。）
二： 安装MYSQL 数据
(5.7 版本之前，可以使用系统root 启用，5.7之后，被限制了，也更加考虑到了其安全性）
注意： 1，mysql 开始安装时，mysql_install_db由5.6之前的在scripts 转移至 bin 目录下。
2，初次进入 mysql 库需要 输入初始密码，路径在 /home/mysql/下：
[mysql@martinli02 mysql-5.7.10]$ cat /home/mysql/.mysql_secret
# Password set for user 'root@localhost' at 2015-12-27 23:17:57
.hyMlk?!b6M!
3， 登陆后，必须要修改密码 mysql> set password=password('xxxxx');
mysql> flush privileges;
三： MYSQL master/slave 配置
---参考 MYSQL 同步复制
----设置参数，自动提交 autocommit = 1 (否然，mycat 插入时，没数据显示)
四： Mycat 安装配置
--这里，mycat 我主要用其实现 读写分离，未做分库分表设置，所以，
只涉及 schema.xml, server.xml 文件的修改。
--Mysql 主节点 使用 innodb 引擎， 备节点 使用myisam 引擎。
# useradd -m -u 1201 -g mysql mycat
# tar -xvf Mycat-server-1.5.1-RELEASE-20160816173057-linux.tar.gz -C /usr/local/
# cd /usr/local/mycat
[root@mysql01 mycat]# ls
bin catlet conf lib logs version.txt --解压出来后，就前5个目录
[root@mysql01 mycat]# cd conf/
[root@mysql01 conf]# ls
autopartition-long.txtlog4j.xml rule.xmlserver.xml
cacheservice.properties myid.properties schema.xml wrapper.conf
dnindex.properties partition-hash-int.txt sequence_conf.properties zk-create.yaml
ehcache.xmlpartition-range-mod.txt sequence_db_conf.properties
index_to_charset.propertiesrouter.xml sequence_time_conf.properties
--配置schema.xml 参数--
[root@mysql01 conf]# cat schema.xml
<?xml version="1.0"?>
<!DOCTYPE mycat:schema SYSTEM "schema.dtd">
<mycat:schema xmlns:mycat="http://org.opencloudb/" >
<!-- ############## Add configure information ############ -->
<schema name="mongodb" checkSQLschema="false" sqlMaxLimit="100" dataNode="dn1">
</schema>
<schema name="redis" checkSQLschema="false" sqlMaxLimit="100" dataNode="dn2">
</schema>
<schema name="test" checkSQLschema="false" sqlMaxLimit="100" dataNode="dn3">
</schema>
<schema name="scout" checkSQLschema="false" sqlMaxLimit="100" dataNode="dn4">
</schema>
<dataNode name="dn1" dataHost="MysqlA-B" database="mongodb" />
<dataNode name="dn2" dataHost="MysqlA-B" database="redis" />
<dataNode name="dn3" dataHost="MysqlA-B" database="test" />
<dataNode name="dn4" dataHost="MysqlA-B" database="scout" />
<dataHost name="MysqlA-B" maxCon="1000" minCon="10" balance="3" writeType="0" dbType="mysql" dbDriver="native" switchType="2" slaveThreshold="100">
<heartbeat>select user()</heartbeat>
<!-- can have multi write hosts -->
<writeHost host="10.118.242.215" url="10.118.242.215:3308" user="root" password="mysql123">
<!-- can have multi read hosts -->
<readHost host="10.118.242.216" url="10.118.242.216:3308" user="query" password="query123">
</readHost>
</writeHost>
</dataHost>
</mycat:schema>
-- server.xml 配置参数 --
[root@mysql01 conf]# cat server.xml
<?xml version="1.0" encoding="UTF-8"?>
<!-- - - Licensed under the Apache License, Version 2.0 (the "License");
- you may not use this file except in compliance with the License. - You
may obtain a copy of the License at - - http://www.apache.org/licenses/LICENSE-2.0
- - Unless required by applicable law or agreed to in writing, software -
distributed under the License is distributed on an "AS IS" BASIS, - WITHOUT
WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - See the License for the specific language governing permissions and - limitations under the License. -->
<!DOCTYPE mycat:server SYSTEM "server.dtd">
<mycat:server xmlns:mycat="http://org.opencloudb/">
<system>
<property name="defaultSqlParser">druidparser</property>
<!-- ########### add configure server port ########## -->
<property name="serverPort">8066</property> <!-- 管理Port -->
<property name="managerPort">9066</property> <!-- 服务Port -->
<property name="processors">4</property> <!-- CPU使用数 -->
<property name="processorExecutor">64</property> <!-- 线程池 -->
<property name="processorBufferChunk">8192</property> <!-- 分配SocketDirectBuffer的大小 -->
<property name="useCompression">1</property> <!--1为开启mysql压缩协议-->
<property name="sequnceHandlerType">1</property>
<!--Mycat全局序列的类型,0为本地文件方式,1为数据库方式 -->
<property name="packetHeaderSize">4</property>
<property name="maxPacketSize">163840</property>
<property name="idleTimeout">1200</property>
<property name="charset">utf8</property>
<!--property name="txIsolation">READ-COMMITTED</property-->
<property name="sqlExecuteTimeout">900</property>
</system>
<user name="root">
<property name="password">mysql123</property>
<property name="schemas">mongodb,redis,test,scout</property>
</user>
<user name="query">
<property name="password">query123</property>
<property name="readOnly">true</property>
<property name="schemas">mongodb,redis,test,scout</property>
</user>
</mycat:server>
--这里，最新版本可以支持密文，无需明文，这里为了方便。
五， 配置xinetd 服务及参数：
在mycat 1,mycat2 上都需添加检测端口48700的脚本，为此需要用到xinetd, xinetd 为linux 系统基础服务， 主要用来监听MYCAT 是否存活。
yum install xinted*
在： /etc/xinted.d/ 及 /usr/local/bin/xinted 下查看配置文件：
--第一种安装方式：
我这里通过第二种方式安装：
tar -xvf xinetd-2.3.15.tar.gz -C /usr/local/
[root@mysql01 ~]# cd /usr/local/xinetd-2.3.15/
[root@mysql01 xinetd-2.3.15]# ls
aclocal.m4 config.guess config.log configure COPYRIGHT libs README xinetd.spec AUDIT config.h config.status configure.in INSTALL Makefile TODO xinetd.spec.in CHANGELOG config.h.in config.sub contrib install-sh Makefile.in xinetd
[root@mysql01 xinetd-2.3.15]# cd contrib/
[root@mysql01 contrib]# ls
empty.conf mycat_monitor.sh xinetd xinetd.conf xinetd.d
[root@mysql01 contrib]# tail -12 xinetd.conf
groups = yes
umask = 002
# Generally, banners are not used. This sets up their global defaults
#
# banner =
# banner_fail =
# banner_success =
}
includedir /usr/local/xinetd-2.3.15/contrib/xinetd.d --主要修改这里
-- /usr/local/xinetd-2.3.15/contrib/xinetd.d/mycat_status --服务参数路径
mycat_status此配置主要是用来监听mycat是否存活的配置
[root@mysql01 contrib]# cat xinetd.d/mycat_status
service mycat_status
{
flags = REUSE
socket_type = stream
port = 48700
wait = no
user = root
server =/usr/local/xinetd-2.3.15/contrib/mycat_monitor.sh
log_on_failure += USERID
disable = no
}
[root@mycat01 xinetd.d]# pwd
/usr/local/xinetd-2.3.15/contrib/xinetd.d
[root@mycat01 xinetd.d]# cd ../
[root@mycat01 contrib]# ls
empty.conf mycat_monitor.sh xinetd xinetd.conf xinetd.d
--mycat_monitor.sh 此配置主要是用来监听mycat是否存活的脚本
[root@mysql01 contrib]# cat mycat_monitor.sh
#!/bin/bash
#/usr/local/bin/mycat_status.sh
# This script checks if a mycat server is healthy running on localhost. It will
# return:
#
# "HTTP/1.x 200 OK\r" (if mycat is running smoothly)
#
# "HTTP/1.x 503 Internal Server Error\r" (else)
mycat=`/usr/local/mycat/bin/mycat status |grep 'not running'| wc -l`
if [ "$mycat" = "0" ];
then
/bin/echo -e "HTTP/1.1 200 OK\r\n"
else
/bin/echo -e "HTTP/1.1 503 Service Unavailable\r\n"
fi
4、/etc/services中加入mycat_status服务 --添加进入后，启动才有效。
加入mycat_status服务，
cd /etc
vi services
在末尾加入以下内容：
mycat_status 48700/tcp # mycat_status
保存
重启xinetd服务
service xinetd restart
############
[root@mycat01 xinetd]# pwd
/usr/local/xinetd-2.3.15/xinetd
--xinetd 启动，停止脚本
--启动脚本：
#!/bin/bash
/usr/local/xinetd-2.3.15/xinetd/xinetd -f /usr/local/xinetd-2.3.15/contrib/xinetd.d/mycat_status &
--停止脚本：
#!/bin/bash
ps -ef |grep xinetd |grep -v grep |awk '{print $2}'|xargs kill -s 9
---------------
启动mysql启动xinted ， 启动mycat
----------------
六， 安装keepalived
--openssl 安装：
openssl 必须先于 keepalive 先安装， 否则安装keepalive时有可能报错，keepalived 依赖openssl.
yum install gcc* cc*
安装openssl-devel
yum install openssl-devel -y #如无法yum下载安装，请修改yum配置文件
--通过rpm 包安装：
mkdir -pv /usr/local/openssl/
tar -xvf xxxxx.gz -C /usr/local/
cd /usr/local/openssl-1.0.1l/
./config --prefix=/usr/local/openssl/
make
make test
make install
ln -s /usr/local/openssl /usr/local/ssl
----openssl配置----
vi /etc/ld.so.conf
在/etc/ld.so.conf文件的最后面，添加如下内容：
/usr/local/openssl/lib
vi /etc/profile
内容如下：
export OPENSSL=/usr/local/openssl/bin
export PATH=$PATH:$OPENSSL
执行以下语句是环境变量生效：
source /etc/profile
测试:
cd /usr/local/openssl/
[root@host-10-118-220-136 openssl]# ls
bin include lib ssl
[root@host-10-118-220-136 openssl]# cd bin/
[root@host-10-118-220-136 bin]# ls
c_rehash openssl
[root@host-10-118-220-136 bin]# ldd openssl
linux-vdso.so.1 => (0x00007fff0ba32000)
libdl.so.2 => /lib64/libdl.so.2 (0x0000003883200000)
libc.so.6 => /lib64/libc.so.6 (0x0000003882e00000)
/lib64/ld-linux-x86-64.so.2 (0x0000003882a00000)
[root@host-10-118-220-136 bin]# pwd
/usr/local/openssl/bin
[root@host-10-118-220-136 bin]# which openssl
/usr/bin/openssl
[root@host-10-118-220-136 bin]# openssl version
OpenSSL 1.0.1l 15 Jan 2015
[root@host-10-118-220-136 bin]#
----在这里，只要keepalive 编辑安装时不抱错，就可以了。不管openssl 是否真成功。
--keepalived安装：
tar -xvf keepalived-1.2.16.tar.gz -C /usr/local/
cd /usr/local/keepalived-1.2.16/
./configure
make && make install
如果 keepalived 安装 报错:
安装keepalive错误：configure: error: No SO_MARK
下面加个参数，禁用fwmark
[root@gw keepalived-1.2.16]# ./configure --disable-fwmark
[root@host-10-118-220-136 etc]# cp /usr/local/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/
[root@host-10-118-220-136 etc]# cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/
[root@host-10-118-220-136 etc]# cp /usr/local/keepalived-1.2.16/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/
[root@host-10-118-220-136 etc]# cp /usr/local/sbin/keepalived /usr/sbin/
--keepalived 配置参数：
[root@mysql03 keepalived]# pwd
/usr/local/keepalived-1.2.16/keepalived/etc/keepalived
[root@mysql03 keepalived]# cat keepalived.conf --主配置
! Configuration File for keepalived
vrrp_script chk_http_port
{
script "/etc/keepalived/scripts/check_haproxy.sh"
interval 2
weight 2
}
vrrp_instance VI_1
{
state MASTER （主为MASTER 备为BACKUP）
interface eth0
virtual_router_id 51
priority 150
advert_int 1
authentication {
auth_type PASS
auth_pass 1234
}
track_script {
chk_http_port
}
virtual_ipaddress
{
10.118.242.212 dev eth0 scope global -- 虚拟
10.118.242.211 dev eth0 scope global
}
notify_master /etc/keepalived/scripts/haproxy_master.sh
notify_backup /etc/keepalived/scripts/haproxy_backup.sh
notify_fault /etc/keepalived/scripts/haproxy_fault.sh
notify_stop /etc/keepalived/scripts/haproxy_stop.sh
}
[root@mysql03 keepalived]# cat keepalived.conf --备配置
! Configuration File for keepalived
vrrp_script chk_http_port
{
script "/etc/keepalived/scripts/check_haproxy.sh"
interval 2
weight 2
}
vrrp_instance VI_1
{
state BACKUP （主为MASTER 备为BACKUP）
interface eth0 --#对外提供服务的网络接口
virtual_router_id51 --#VRRP组名，两个节点的设置必须一样，以指明各个节点属于同一VRRP组
priority 120
advert_int 1
authentication {
auth_type PASS
auth_pass 1234
}
track_script {
chk_http_port --#调用脚本check_haproxy.sh检查haproxy是否存活
}
virtual_ipaddress
{
10.118.242.212 dev eth0 scope global --这ip必须与我们在lvs客户端设定的vip相一致
10.118.242.211 dev eth0 scope global
}
notify_master /etc/keepalived/scripts/haproxy_master.sh
notify_backup /etc/keepalived/scripts/haproxy_backup.sh
notify_fault /etc/keepalived/scripts/haproxy_fault.sh
notify_stop /etc/keepalived/scripts/haproxy_stop.sh
}
-----------------------------------
1. virtual_router_id 51 这个代表一个集群组，如果同一个网段还有另一组集群，请使用不同的组编号区分。如换成52、53等。
2. interface eth1 和172.17.210.103 dev eth1 scope global中的eth1指的是网卡，如果是多网卡，可能会有eth0，eth1，eth2…，可以使用ifconfig命令查看，确保eth0是本机存在的网卡地址。有些服务器如果只有一个网卡，但被人为把eth0改成eth1了，你再写eth0就找不到了的。
-----------------------------------
[root@mysql03 scripts]# cat check_haproxy.sh
#!/bin/bash
STARTHAPROXY="/usr/local/haproxy/sbin/haproxy -f /usr/local/haproxy/haproxy.cfg"
STOPKEEPALIVED="/etc/init.d/keepalived stop"
LOGFILE="/usr/local/keepalived/var/log/keepalived-haproxy-state.log"
echo "[check_haproxy status]" >> $LOGFILE
A=`ps-C haproxy --no-header |wc-l`
echo "[check_haproxy status]" >> $LOGFILE
date >> $LOGFILE
if [ $A -eq 0 ];then
echo $STARTHAPROXY >> $LOGFILE
$STARTHAPROXY >> $LOGFILE 2>&1
sleep5
fi
if [ `ps -C haproxy --no-header |wc-l` -eq0 ];then
exit 0
else
exit 1
fi
-----------------------
粗体check_haproxy.sh
vi /etc/keepalived/scripts/check_haproxy.sh
脚本含义：如果没有haproxy进程存在，就启动haproxy，停止keepalived
check_haproxy.sh
[root@mysql03 scripts]# cat haproxy_master.sh (主备一样）
#!/bin/bash
STARTHAPROXY=`/usr/local/haproxy/sbin/haproxy-f/usr/local/haproxy/haproxy.cfg`
STOPHAPROXY=`ps-ef |grep sbin/haproxy| grep -vgrep|awk'{print $2}'|xargskill-s 9`
LOGFILE="/usr/local/keepalived/var/log/keepalived-haproxy-state.log"
echo "[master]" >> $LOGFILE
date >> $LOGFILE
echo "Being master...." >> $LOGFILE 2>&1
echo "stop haproxy...." >> $LOGFILE 2>&1
$STOPHAPROXY >> $LOGFILE 2>&1
echo "start haproxy...." >> $LOGFILE 2>&1
$STARTHAPROXY >> $LOGFILE 2>&1
echo "haproxy stared ..." >> $LOGFILE
[root@mysql03 scripts]# cat haproxy_fault.sh (主备一样）
#!/bin/bash
LOGFILE=/usr/local/keepalived/var/log/keepalived-haproxy-state.log
echo "[fault]" >> $LOGFILE
date >> $LOGFILE
[root@mysql03 scripts]# cat haproxy_stop.sh (主备一样）
#!/bin/bash
LOGFILE=/usr/local/keepalived/var/log/keepalived-haproxy-state.log
echo "[stop]" >> $LOGFILE
date >> $LOGFILE
--启动keepalived:
[root@mysql03 keepalived-1.2.16]# /etc/init.d/keepalived restart
Stopping keepalived: [FAILED]
Starting keepalived: [ OK ]
-- 测试验证
[root@mysql03 scripts]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UNKNOWN qlen 1000
link/ether 00:50:56:aa:54:86 brd ff:ff:ff:ff:ff:ff
inet 10.118.242.214/24 brd 10.118.242.255 scope global eth0
inet 10.118.242.212/32 scope global eth0
inet6 fe80::250:56ff:feaa:5486/64 scope link
valid_lft forever preferred_lft forever
七： haproxy 安装配置
# tar xf haproxy-1.4.25.tar.gz -C /usr/local/
# cd haproxy-1.4.25
# --查看版本号（os-kener）
# make TARGET=linux26 PREFIX=/usr/local/haproxy install
注：TARGET后面根据本机操作系统内核版本来填写
创建配置文件目录，日志目录，并根据需求编写配置文件
# mkdir /usr/local/haproxy/{conf,logs}
# vim /usr/local/haproxy/conf/haproxy.cfg
配置 参数，主备一样：
[root@mysql03 conf]# cat haproxy.cfg
global
log 127.0.0.1 local0
maxconn 4096
chroot /usr/local/haproxy
user mysql
group mysql
daemon
quiet
nbproc 1
pidfile /usr/local/haproxy/logs/haproxy.pid
defaults
log global
option dontlognull
retries 3
option httplog
option redispatch
maxconn 3000
contimeout 50000
clitimeout 50000
srvtimeout 50000
listen admin_stats
bind 10.118.242.212:48800
stats uri /admin-status
stats auth admin:admin
mode http
option httplog
listen allmycat_service
bind 10.118.242.212:8096
mode tcp
option tcplog
option httpchk OPTION * HTTP/1.1\r\nHost:\ www
balance roundrobin
server mycat_209 10.118.242.209:8066 check port 48700 inter 5s rise 2 fall 3
server mycat_210 10.118.242.210:8066 check port 48700 inter 5s rise 2 fall 3
srvtimeout 20000
listen allmycat_admin
bind 10.118.242.212:8097
mode tcp
option tcplog
option httpchk OPTIONS * HTTP/1.1\r\nHost:\ www
balance roundrobin
server mycat_209 10.118.242.209:9066 check port 48700 inter 5s rise 2 fall 3
server mycat_210 10.118.242.210:9066 check port 48700 inter 5s rise 2 fall 3
srvtimeout 20000
---------------------------
bind 10.118.242.212:8096 对应的是mycat 8066 端口，
bind 10.118.242.212:8097 对应的是mycat 9066 端口。 （需要和mycat 一致）
server 为 mycat 两台主机
----------------------------
配置haproxy 日志记录方式：
yum install rsyslog -y
--默认haproxy 是不记录日志的，为了记录日志还需要配置syslog 模块，在Linux下rsyslogd服务
--先安装rsyslog
cd /etc/rsyslog.d/ --如果没有此目录，需新创建。
[root@mysql03 conf]# cd /etc/rsyslog.d/
[root@mysql03 rsyslog.d]# ls
haproxy.conf
[root@mysql03 rsyslog.d]# cat haproxy.conf --添加内容
$ModLoad imudp
$UDPServerRun 514
local0.* /var/log/haproxy.log
[root@mysql03 rsyslog.d]# pwd
/etc/rsyslog.d --添加
在#### RULES ####上面一行的地方加入以下内容：
# Include all config files in /etc/rsyslog.d/
$IncludeConfig /etc/rsyslog.d/*.conf
#### RULES ####
在local7.* /var/log/boot.log的下面加入以下内容（增加后的效果如下）：
local0.* /var/log/haproxy.log
启动rsyslog 服务
--立马在/var/log/有 harporxy.log 了。
[root@mysql03 rsyslog.d]# cd /var/log/
[root@mysql03 log]# ll haproxy.log
-rw-------. 1 root root 5160 Nov 15 16:49 haproxy.log
启动 haproxy：
# /usr/local/haproxy/sbin/haproxy -c /usr/local/haproxy/conf/haproxy.cfg
---------
[root@mysql03 log]# netstat -nltp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN 1381/rpcbind
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 1676/sshd
tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN 1545/cupsd
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 1752/master
tcp 0 0 127.0.0.1:6010 0.0.0.0:* LISTEN 6278/sshd
tcp 0 0 127.0.0.1:6011 0.0.0.0:* LISTEN 6387/sshd
tcp 0 0 127.0.0.1:6012 0.0.0.0:* LISTEN 24216/sshd
tcp 0 0 10.118.242.212:8096 0.0.0.0:* LISTEN 16997/haproxy
tcp 0 0 10.118.242.212:48800 0.0.0.0:* LISTEN 16997/haproxy
tcp 0 0 10.118.242.212:8097 0.0.0.0:* LISTEN 16997/haproxy
tcp 0 0 0.0.0.0:56457 0.0.0.0:* LISTEN 1399/rpc.statd
通过本地MYSQL 工具调试：
MYSQL IP + 端口 可以连接
MYCAT IP + 端口 也可以连接
HAPORXY(VIP) + 端口 也可以连接
通过 url 地址 可以看见 haproxy 调度 界面： http://10.118.242.212:48800
账号密码 admin/admin
-------- THE END -------
-----报错处理：
[root@mysql01 sbin]# /usr/local/haproxy-1.6.2/sbin/haproxy -f /usr/local/haproxy-1.6.2/conf/haproxy.cfg &
[1] 6783
[root@mysql01 sbin]# [ALERT] 293/121421 (6783) : parsing [/usr/local/haproxy-1.6.2/conf/haproxy.cfg:21] : 'listen' cannot handle unexpected argument '10.118.242.211:48800'.
[ALERT] 293/121421 (6783) : parsing [/usr/local/haproxy-1.6.2/conf/haproxy.cfg:21] : please use the 'bind' keyword for listening addresses.
[ALERT] 293/121421 (6783) : parsing [/usr/local/haproxy-1.6.2/conf/haproxy.cfg:26] : 'listen' cannot handle unexpected argument '10.118.242.211:8098'.
[ALERT] 293/121421 (6783) : parsing [/usr/local/haproxy-1.6.2/conf/haproxy.cfg:26] : please use the 'bind' keyword for listening addresses.
[ALERT] 293/121421 (6783) : Error(s) found in configuration file : /usr/local/haproxy-1.6.2/conf/haproxy.cfg
[ALERT] 293/121421 (6783) : Fatal errors found in configuration.
--这里的：[/usr/local/haproxy-1.6.2/conf/haproxy.cfg:21] : 'listen' cannot handle unexpected argument '10.118.242.211:48800'.
是因为写法错误：
--------------------
[root@mysql02 sbin]# /usr/local/haproxy-1.6.2/sbin/haproxy -f /usr/local/haproxy-1.6.2/conf/haproxy.cfg
[ALERT] 293/151834 (20139) : Starting proxy admin_stats: cannot bind socket [10.118.242.211:48800]
[ALERT] 293/151834 (20139) : Starting proxy allmycat_service: cannot bind socket [10.118.242.211:8098]
--这里报错需要修改/etc/sysctl.conf 参数
[ALERT] 164/110030 (11606) : Starting proxy linuxyw.com: cannot bind socket
这个问题，其实就是因为你的haproxy没有得到VIP的原因，而你的配置文件又绑定了VIP地址，所以会提示以上错误 当然，你也要确保你的haproxy服务器做了hearbeat或keepalived，绑定VIP，要不就无法高可用了。
解决方法：
修改内核参数： /etc/sysctl.conf
net.ipv4.ip_nonlocal_bind=1
保存结果，使结果生效
sysctl –p
或者使用echo进去，前提是sysctl.conf文件中没有本条参数：
echo 'net.ipv4.ip_nonlocal_bind = 1'>>/etc/sysctl.conf
net.ipv4.ip_nonlocal_bind=1 意思是启动haproxy的时候，允许忽视VIP的存在
传到各个机器
for i in IP1 IP2 IP3 IP4
do scp /etc/hosts $i:/etc;
done
--------MYSQL MY.CNF 配置参数------
[client]
user=martin
password=88888888
[mysqld]
########basic settings########
server-id= 11
port = 3308
user = mysql
bind_address = 10.118.242.209
autocommit = 1
character_set_server=utf8mb4
skip_name_resolve = 1
max_connections = 800
max_connect_errors = 1000
datadir = /data/mysql_data
transaction_isolation =READ-COMMITTED
explicit_defaults_for_timestamp = 1
join_buffer_size = 134217728
tmp_table_size = 67108864
tmpdir = /tmp
max_allowed_packet = 16777216
sql_mode ="STRICT_TRANS_TABLES,NO_ENGINE_SUBSTITUTION,NO_ZERO_DATE,NO_ZERO_IN_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER"
interactive_timeout = 1800
wait_timeout = 1800
read_buffer_size = 16777216
read_rnd_buffer_size = 33554432
sort_buffer_size = 33554432
########log settings########
log_error = error.log
slow_query_log = 1
slow_query_log_file = slow.log
log_queries_not_using_indexes = 1
log_slow_admin_statements = 1
log_slow_slave_statements = 1
log_throttle_queries_not_using_indexes = 10
expire_logs_days = 90
long_query_time = 2
min_examined_row_limit = 100
########replication settings########
master_info_repository = TABLE
relay_log_info_repository = TABLE
log_bin = bin.log
sync_binlog = 1
gtid_mode = on
enforce_gtid_consistency = 1
log_slave_updates
binlog_format = row
relay_log = relay.log
relay_log_recovery = 1
binlog_gtid_simple_recovery = 1
slave_skip_errors = ddl_exist_errors
########innodb settings########
innodb_page_size = 8192
innodb_buffer_pool_size = 6G
innodb_buffer_pool_instances = 8
innodb_buffer_pool_load_at_startup = 1
innodb_buffer_pool_dump_at_shutdown = 1
innodb_lru_scan_depth = 2000
innodb_lock_wait_timeout = 5
innodb_io_capacity = 4000
innodb_io_capacity_max = 8000
innodb_flush_method = O_DIRECT
innodb_file_format = Barracuda
innodb_file_format_max = Barracuda
innodb_log_group_home_dir = /redolog/
innodb_undo_directory = /undolog/
innodb_undo_logs = 128
innodb_undo_tablespaces = 3
innodb_flush_neighbors = 1
innodb_log_file_size = 4G
innodb_log_buffer_size = 16777216
innodb_purge_threads = 4
innodb_large_prefix = 1
innodb_thread_concurrency = 64
innodb_print_all_deadlocks = 1
innodb_strict_mode = 1
innodb_sort_buffer_size = 67108864
########semi sync replication settings########
plugin_dir=/usr/local/mysql/lib/plugin
plugin_load = "rpl_semi_sync_master=semisync_master.so;rpl_semi_sync_slave=semisync_slave.so"
loose_rpl_semi_sync_master_enabled = 1
loose_rpl_semi_sync_slave_enabled = 1
loose_rpl_semi_sync_master_timeout = 5000
[mysqld-5.7]
innodb_buffer_pool_dump_pct = 40
innodb_page_cleaners = 4
innodb_undo_log_truncate = 1
innodb_max_undo_log_size = 2G
innodb_purge_rseg_truncate_frequency = 128
log_timestamps=system
transaction_write_set_extraction=MURMUR32
show_compatibility_56=on
haproxy+keepalived+mycat+mysql (读写分离）
原文地址：http://blog.51cto.com/sf1314/2073256
