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Mycat高可用集群搭建

發(fā)布時間：2025/3/20 编程问答 30 豆豆

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HaProxy+Keepalived+Mycat高可用集群配置

部署圖：

集群部署圖理解：

1、keepalived和haproxy必須裝在同一臺機(jī)器上（如192.168.46.161機(jī)器上，keepalived和haproxy都要安裝），keepalived負(fù)責(zé)為該服務(wù)器搶占vip（虛擬ip），搶占到vip后，對該主機(jī)的訪問可以通過原來的ip（192.168.46.161）訪問，也可以直接通過vip（192.168.46.180）訪問。

2、192.168.46.162上的keepalived也會去搶占vip，搶占vip時有優(yōu)先級，配置keepalived.conf中的（priority 150 #數(shù)值愈大，優(yōu)先級越高,192.168.46.162上改為120，master和slave上該值配置不同）決定。但是一般哪臺主機(jī)上的keepalived服務(wù)先啟動就會搶占到vip，即使是slave，只要先啟動也能搶到。

3、haproxy負(fù)責(zé)將對vip的請求分發(fā)到mycat上。起到負(fù)載均衡的作用，同時haproxy也能檢測到mycat是否存活，haproxy只會將請求轉(zhuǎn)發(fā)到存活的mycat上。

4、如果一臺服務(wù)器（keepalived+haproxy服務(wù)器）宕機(jī)，另外一臺上的keepalived會立刻搶占vip并接管服務(wù)。如果一臺mycat服務(wù)器宕機(jī)，haporxy轉(zhuǎn)發(fā)時不會轉(zhuǎn)發(fā)到宕機(jī)的mycat上，所以mycat依然可用。

1、Haproxy的安裝

1.1、配置haprxoy

（下載地址: http://www.haproxy.org/#down）

useradd haproxy

cd haproxy-1.4.27/

make TARGET=linux26 PREFIX=/usr/local/haproxy ARCH=x86_64

make install PREFIX=/usr/local/haproxy

cd /usr/local/haproxy

vi haproxy.cfg

增加如下內(nèi)容：

global

log 127.0.0.1 local0

????????maxconn 4096

????????chroot /usr/local/haproxy

????????user haproxy

????????group haproxy

????????daemon

defaults

????????log global

????????option dontlognull

????????retries 3

????????option redispatch

????????maxconn 2000

????????contimeout 5000

????????clitimeout 50000

????????srvtimeout 50000

listen admin_stats 192.168.46.180:48800

????????stats uri /admin-status

????????stats auth admin:admin

????????mode http

????????option httplog

listen mycat_service 192.168.46.180:18066

????????mode tcp

????????option tcplog

??????????option httpchk OPTIONS * HTTP/1.1\r\nHost:\ www

????????balance roundrobin

??????????server mycat_161 192.168.46.161:8066 check port 48700 inter 5s rise 2 fall 3

??????????server mycat_162 192.168.46.162:8066 check port 48700 inter 5s rise 2 fall 3

????????srvtimeout 20000

listen mycat_admin 192.168.46.180:19066

????????mode tcp

????????option tcplog

??????????option httpchk OPTIONS * HTTP/1.1\r\nHost:\ www

????????balance roundrobin

??????????server mycat_161 192.168.46.161:9066 check port 48700 inter 5s rise 2 fall 3

??????????server mycat_162 192.168.46.162:9066 check port 48700 inter 5s rise 2 fall 3

????????srvtimeout 20000

????????

1.2、配置haproxy記錄日志功能

yum install rsyslog -y

cd /etc/rsyslog.d/

vi haproxy.conf

增加內(nèi)容：

$ModLoad imudp

$UDPServerRun 514

local0.* /var/log/haproxy.log

vi /etc/rsyslog.conf

在#### RULES ####上面一行加入以下內(nèi)容

# Include all config files in /etc/rsyslog.d/

$IncludeConfig /etc/rsyslog.d/*.conf

在local7.* /var/log/boot.log下面加入以下內(nèi)容

local0.* /var/log/haproxy.log

重啟rsyslog服務(wù)并將rsyslog加入自動啟動服務(wù)

service rsyslog restart

chkconfig --add rsyslog

chkconfig --level 2345 rsyslog on

1.3 配置監(jiān)聽mycat是否存活(在Mycat server1 Mycat server2上都需要添加檢測端口48700的腳本，為此需要用到xinetd，xinetd為linux系統(tǒng)的基礎(chǔ)服務(wù))

yum install xinetd -y

cd /etc/xinetd.d

vi mycat_status

增加內(nèi)容：

service mycat_status

{

????????flags = REUSE

????????socket_type = stream

????????port = 48700

????????wait = no

????????user = nobody

????????server = /usr/local/bin/mycat_status

????????log_on_failure += USERID

????????disable = no

}

vi /usr/local/bin/mycat_status (創(chuàng)建xinetd啟動服務(wù)腳本)

增加內(nèi)容：

#!/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"

修改腳本文件權(quán)限

chmod 777 /usr/local/bin/mycat_status

chmod 777 /etc/xinetd.d/mycat_status

將啟動腳本加入服務(wù)

vi /etc/services

末尾增加：

mycat_status 48700/tcp # mycat_status

重啟xinetd服務(wù)并將xinetd加入自啟動服務(wù)

service xinetd restart

chkconfig --add xinetd

chkconfig --level 2345 xinetd on

驗證mycat_status服務(wù)是否啟動成功

netstat -antup|grep 48700

1.4、創(chuàng)建haproxy啟停腳本

?1.4.1、啟動腳本

? vi ?/usr/local/haproxy/sbin/start

增加內(nèi)容：

#!/bin/sh

/usr/local/haproxy/sbin/haproxy -f /usr/local/haproxy/haproxy.cfg &

??增加權(quán)限：

chmod +x /usr/local/haproxy/sbin/start

?1.4.2、關(guān)閉腳本

? vi /usr/local/haproxy/sbin/stop

? 增加內(nèi)容：

#!/bin/sh

ps -ef | grep sbin/haproxy | grep -v grep |awk '{print $2}'|xargs kill -s 9

? 增加權(quán)限：

chmod +x /usr/local/haproxy/sbin/stop

?1.4.3、授權(quán)

? chown -R haproxy.haproxy /usr/local/haproxy/*

1.5、啟動haproxy

啟動haproxy前必須先啟動keepalived，否則啟動不了。

啟動命令：

/usr/local/haproxy/sbin/haproxy -f /usr/local/haproxy/haproxy.cfg

啟動haproxy異常情況

如果報以下錯誤：

[root@localhost bin]# /usr/local/haproxy/sbin/haproxy -f /usr/local/haproxy/haproxy.cfg

[ALERT] 183/115915 (12890) :Starting proxy admin_status: cannot bind socket

[ALERT] 183/115915 (12890) :Starting proxy allmycat_service: cannot bind socket

[ALERT] 183/115915 (12890) :Starting proxy allmycat_admin: cannot bind socket

原因為：該機(jī)器沒有搶占到vip，如果另一臺服務(wù)啟動正常，這個錯誤可以忽略不管，如果另一臺也一樣，使用ping vip命令看看vip是否生效，如果沒有生效，說明keepalived沒有啟動成功，回去檢查keepalived的異常再說。啟動后可以通過http://192.168.46.180:48800/admin-status (用戶名密碼都是admin，haproxy.cfg中配置的)

2、Keepalived安裝

2.1 openssl安裝

(下載地址：https://www.openssl.org/source/)

? openssl必須安裝，否則安裝keepalived時無法編譯，keepalived依賴openssl

? tar -zxvf openssl-1.0.2l.tar.gz

? cd openssl-1.0.2l

? ./config --prefix=/usr/local/openssl

? ./config -t

make depend

make

make test

make install

ln -s /usr/local/openssl /usr/local/ssl

vi /etc/ld.so.conf

在文件末尾加入以下內(nèi)容

/usr/local/openssl/lib

修改環(huán)境變量

vi /etc/profile

在文件末尾加入以下內(nèi)容

export OPENSSL=/usr/local/openssl/bin

export PATH=$PATH:$OPENSSL

source /etc/profile

安裝openssl-devel

yum install openssl-devel -y

測試

ldd /usr/local/openssl/bin/openssl

linux-vdso.so.1 => (0x00007fff996b9000)

libdl.so.2 =>/lib64/libdl.so.2 (0x00000030efc00000)

libc.so.6 =>/lib64/libc.so.6 (0x00000030f0000000)

/lib64/ld-linux-x86-64.so.2 (0x00000030ef800000)

which openssl

/usr/bin/openssl

openssl version

OpenSSL 1.0.0-fips 29 Mar 2010

2.2 keepalived安裝

在192.168.46.161，192.168.46.162兩臺機(jī)器進(jìn)行keepalived安裝

tar zxvf keepalived-1.2.13.tar.gz

cd keepalived-1.2.13

./configure --prefix=/usr/local/keepalived

make

make install

cp /usr/local/keepalived/sbin/keepalived /usr/sbin/

cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/

cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/

mkdir /etc/keepalived

cd /etc/keepalived/

cp /usr/local/keepalived/etc/keepalived/keepalived.conf ?/etc/keepalived

mkdir -p /usr/local/keepalived/var/log

keepalived配置

建檢查haproxy是否存活的腳本

mkdir /etc/keepalived/scripts

cd /etc/keepalived/scripts

vi /etc/keepalived/keepalived.conf

Master的配置：

! 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

????????interface eth1

????????virtual_router_id 51

????????priority 150

????????advert_int 1

????????authentication

????????auth_type PASS

????????auth_pass 1111

}

track_script {

????????chk_http_port

}

virtual_ipaddress {

????????192.168.46.180 dev eth1 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

}

Slave的配置：

! 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

????????interface eth1

????????virtual_router_id 51

????????priority 150

????????advert_int 1

????????authentication

????????auth_type PASS

????????auth_pass 1111

}

track_script {

????????chk_http_port

}

virtual_ipaddress {

????????192.168.46.180 dev eth1 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 這個代表一個集群組，如果同一個網(wǎng)段還有另一組集群，請使用不同的組編號區(qū)分。如換成52、53等。

2. interface eth1 和172.17.210.103 dev eth1 scope global中的eth1指的是網(wǎng)卡，如果是多網(wǎng)卡，可能會有

?eth0，eth1，eth2…，可以使用ifconfig命令查看，確保eth0是本機(jī)存在的網(wǎng)卡地址。有些服務(wù)器如果只有一個網(wǎng)卡，但被人為把eth0改成eth1了，你再寫eth0就找不到了的。

vi /etc/keepalived/scripts/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

sleep 5

if [ `ps -C haproxy --no-header |wc -l` -eq 0 ];then

exit 0

else

exit 1

vi /etc/keepalived/scripts/haproxy_master.sh

#!/bin/bash

STARTHAPROXY=`/usr/local/haproxy/sbin/haproxy -f /usr/local/haproxy/haproxy.cfg`

STOPHAPROXY=`ps -ef | grep sbin/haproxy | grep -v grep | awk '{print $2}'| xargs kill -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

vi /etc/keepalived/scripts/haproxy_backup.sh

#!/bin/bash

STARTHAPROXY=`/usr/local/haproxy/sbin/haproxy -f /usr/local/haproxy/haproxy.cfg`

STOPHAPROXY=`ps -ef | grep sbin/haproxy | grep -v grep | awk '{print $2}'| xargs kill -s 9`

LOGFILE="/usr/local/keepalived/var/log/keepalived-haproxy-state.log"

echo "[backup]" >> $LOGFILE

date >> $LOGFILE

echo "Being backup...." >> $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

vi /etc/keepalived/scripts/haproxy_fault.sh

#!/bin/bash

LOGFILE=/usr/local/keepalived/var/log/keepalived-haproxy-state.log

echo "[fault]" >> $LOGFILE

date >> $LOGFILE

vi /etc/keepalived/scripts/haproxy_stop.sh

#!/bin/bash

LOGFILE=/usr/local/keepalived/var/log/keepalived-haproxy-state.log

echo "[stop]" >> $LOGFILE

date >> $LOGFILE

賦予腳本可執(zhí)行權(quán)限

chmod 777 /etc/keepalived/scripts/*

將keepalived加入自啟動服務(wù)并啟動

chkconfig --add keepalived

?????chkconfig --level 2345 keepalived on

service keepalived start

3、搭建完成

表明搭建完成！

轉(zhuǎn)載于:https://www.cnblogs.com/atomicbomb/p/7233402.html

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