Shulou(Shulou.com)06/02 Report--

Magent Cache Proxy Introduction

Because there is no communication between Memcached servers, there is a single point of failure when any server node fails. Prevent single-point phenomena with Magent cache proxy. By connecting clients to the cache proxy server, the cache proxy server can connect multiple Memcached machines and synchronize data from each Memcached machine simultaneously. If one of the cache servers goes down, the system can still work, and if one of the Memcached machines goes down, the data will not be lost and the integrity of the data can be guaranteed.

Principle demonstration diagram:

Introduction to experimental environment:

Three servers:

master/slave/client

experimental procedure

Install libevent, memcached on both master and slave

master&&slave:

systemctl stop firewalld.service

setenforce 0

tar zxvf memcached-1.5.6.tar.gz -C /opt

tar zxvf libevent-2.1.8-stable.tar.gz -C /opt

yum install gcc gcc-c++ -y

cd /opt/libevent-2.1.8-stable/

./ configure --prefix=/usr/local

make && make install

cp /usr/local/lib/libevent-2.1.so.6 /usr/lib64/

cd /opt/memcached-1.5.6/

./ configure --with-libevent=/usr/local

make && make install

Install and configure magent on master

master:

mkdir /opt/magent

tar zxvf magent-0.5.tar.gz -C /opt

vim /opt/magent/ketama.h

#ifndef SSIZE_MAX

#define SSIZE_MAX 32767

#endif

vim /opt/magent/Makefile

LIBS = -levent -lm Here is the English word 'l', not 1

make

Copy magent command to slave server

Note: Marked places are locations to be changed

yum install openssl-clients -y

cp magent /usr/bin

scp magent root@192.168.218.157:/usr/bin

yum install keepalived -y

vim /etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {

notification_email {

acassen@firewall.loc

failover@firewall.loc

sysadmin@firewall.loc

}

notification_email_from Alexandre.Cassen@firewall.loc

smtp_server 192.168.200.1

smtp_connect_timeout 30

router_id MAGENT_HA

}

vrrp_script magent {

script "/opt/shell/magent.sh" Script location

interval 2 detection script is 2 seconds

}

vrrp_instance VI_1 {

state MASTER

interface ens33

virtual_router_id 51

priority 100

advert_int 1

authentication {

auth_type PASS

auth_pass 1111

}

track_script {call vrrp_script magent

magent

}

virtual_ipaddress {

192.168.218.16

}

}

Install configuration keepalived from server

slave:

yum install openssl-clients -y

yum install keepalived -y

cd /etc/keepalived/

mv keepalived.conf keepalived.conf.bk

master:

cd /etc/keepalived/

scp keepalived.conf root@192.168.218.157:/etc/keepalived/keepalived.conf

slave:

vim /etc/keepalived/keepalived.conf

global_defs {

router_id MAGENT_HB

vrrp_instance VI_1 {

state BACKUP

virtual_router_id 52

priority 90

master:

mkdir /opt/shell

vim /opt/shell/magent.sh

#!/ bin/bash k=`ps -ef | grep keepalived | grep -v grep | wc -l` if [ $k -gt 0 ];then magent -u root -n 51200 -l 192.168.218.16 -p 12000 -s 192.168.218.130:11211 -b 192.168.218.157:11211 else pkill -9 magent fi

chmod +x /opt/shell/magent.sh

systemctl start keepalived.servic

netstat -ntap |grep 12000 #At this time check that there should be 12000 port number

slave:

mkdir /opt/shell

vim /opt/shell/magent.sh

#!/ bin/bash K=`ip addr | grep 192.168.218.16 | grep -v grep | wc -l` if [ $K -gt 0 ];then magent -u root -n 51200 -l 192.168.218.16 -p 12000 -s 192.168.218.130:11211 -b 192.168.218.157:11211 else pkill -9 magent fi

#magent -u specifies user, -n specifies number of connections, -l specifies drift address, -p specifies port, -s specifies master server address, -b specifies slave server address

chmod +x /opt/shell/magent.sh

systemctl start keepalived.servic

netstat -ntap |grep 12000 #At this time check that there should be 12000 port number

master:

memcached -m 512k -u root -d -l 192.168.218.130 -p 11211

netstat -ntap | grep 11211

slave:

memcached -m 512k -u root -d -l 192.168.218.157 -p 11211

netstat -ntap | grep 11211

Testing:

master:

yum install telnet -y

telnet 192.168.218.130 11211

slave:

yum install telnet -y

telnet 192.168.218.157 11211

client：

yum install telnet -y

telnet 192.168.218.16 12000

Trying 192.168.218.16...

Connected to 192.168.218.16.

Escape character is '^]'.

add username 0 0 7 #Write a piece of data

1231231

STORED

slave:

telnet 192.168.218.157 11211

Trying 192.168.218.157...

Connected to 192.168.218.157.

Escape character is '^]'.

get username

VALUE username 0 7

1231231 #Synchronized data can be seen on master and slave servers

END

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