memcached + keepavlied + magent 实现高可用
系统环境服务器名称
IP地址
操作系统
软件包
用途
VIP地址
nosql1.linuxplus.com
172.16.216.185
Centos 7.5
libevent-devel,memcached,magent
主节点
172.16.216.200
nosql2.linuxplus.com172.16.216.186Centos 7.5libevent-devel,memcached,magent备份节点
nosql3.linuxplus.com172.16.216.187Centos 7.5telnet
测试节点
安装magent
# mkdir /opt/software/magent
# tar xf magent-0.5.tar.gz -C /opt/software/magent
# cd magent/
# ls
ketama.cketama.hmagent.cMakefile
# vim ketama.h
#ifndef _KETAMA_H
#define _KETAMA_H
添加：
#ifndef SSIZE_MAX
#define SSIZE_MAX 32767
#endif
# vim Makefile
LIBS = -levent -lm #首行LIBS = -levent后加上-lm
# make
gcc -Wall -O2 -g-c -o magent.o magent.c
gcc -Wall -O2 -g-c -o ketama.o ketama.c
gcc -Wall -O2 -g -o magent magent.o ketama.o -levent -lm
# ls
ketama.cketama.hketama.omagentmagent.cmagent.oMakefile
# cp magent /usr/bin
# scp magent root@172.16.216.186:/usr/bin 安装配置keepalived
[*] nosql1.linuxplus.com
# yum install keepalived
# cd /etc/keepalived/
# vim keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
devops@qq.com
}
notification_email_from devops@qq.com
smtp_server mail.qq.com
smtp_connect_timeout 30
router_id devops_MA
enable_script_security
}
vrrp_script magent {
script "/opt/magent.sh"
interval 2
user root
}
vrrp_instance devops_ha {
state MASTER
interface ens33
virtual_router_id 51
priority 180
advert_int 1
nopreempt
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
172.16.216.200
}
track_script {
magent
}
}
# vim /opt/magent.sh
#!/bin/bash
mem=$(ps -ef | grep keepalived | grep -v grep | wc -l)
if [ $mem -gt 0 ]
then
magent -u devops -n 51200 -l 172.16.216.200 -p 12000 -s 172.16.216.185:11211 -b 172.16.216.186:11211
/usr/local/memcached/bin/memcached -u devops -m 128 -d
else
pkill -9 magent
fi
# systemctl start keepalived.service
# netstat -ntap | grep 12000
tcp 0 0 172.16.216.200:12000 0.0.0.0:* LISTEN 16649/magent
# netstat -tulnp |grep 11211
tcp 0 0 0.0.0.0:11211 0.0.0.0:* LISTEN 13959/./memcached
tcp6 0 0 :::11211 :::* LISTEN 13959/./memcached参数：
[*] -n：定义最大连接数
[*] -l：指定虚拟IP
[*] -p：指定虚拟IP的端口号
[*] -s：指定主缓存服务器
[*] -b：指定从缓存服务器
https://images-cdn.shimo.im/mFNyryHwbrI3V4Md/image.png!thumbnail
[*] nosql2.linuxplus.com
# yum install keepalived
# cd /etc/keepalived/
# vim keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
devops@qq.com
}
notification_email_from devops@qq.com
smtp_server mail.qq.com
smtp_connect_timeout 30
router_id devops_MB
enable_script_security
}
vrrp_script magent {
script "/opt/magent.sh"
interval 2
user root
}
vrrp_instance devops_ha {
state BACKUP
interface ens33
virtual_router_id 52
priority 90
advert_int 1
nopreempt
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
172.16.216.200
}
track_script {
magent
}
}
# vim /opt/magent.sh
#!/bin/bash
mem=$(ip addr | grep 172.16.216.200 | grep -v grep | wc -l)
if [ $mem -gt 0 ]
then
magent -u devops -n 51200 -l 172.16.216.200 -p 12000 -s 172.16.216.185:11211 -b 172.16.216.186:11211
/usr/local/memcached/bin/memcached -u devops -m 128 -d
else
pkill -9 magent
fi
# systemctl start keepalived.service
# netstat -tulnp |grep 12000
tcp 0 0 172.16.216.200:12000 0.0.0.0:* LISTEN 27343/magent
# netstat -tulnp |grep 11211
tcp 0 0 0.0.0.0:11211 0.0.0.0:* LISTEN 13959/./memcached
tcp6 0 0 :::11211 :::* LISTEN 13959/./memcached https://images-cdn.shimo.im/FP1R1mb4xEo7OZ6c/image.png!thumbnail
测试验证
# telnet 172.16.216.200 12000
Trying 172.16.216.200...
Connected to 172.16.216.200.
Escape character is '^]'.
set username 0 0 11
devopsadmin
STORED
get username
VALUE username 0 11
devopsadmin
END
# telnet 172.16.216.185 11211
Trying 172.16.216.185...
Connected to 172.16.216.185.
Escape character is '^]'.
get username
VALUE username 0 11
devopsadmin
END
quit
Connection closed by foreign host.
# telnet 172.16.216.186 11211
Trying 172.16.216.186...
Connected to 172.16.216.186.
Escape character is '^]'.
get username
VALUE username 0 11
devopsadmin
END
quit
Connection closed by foreign host.
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