Memcached高可用群集
阿新 • • 發佈：2018-07-31
system pack pkill 獲取 序列 let ons nature mnt Memcached高可用群集
主服務器安裝Memcached、magent、libevent
安裝 libevent memcached magent （主服務器） [root@localhost asd] cd /opt/libevent-2.1.8-stable [root@localhost libevent-2.1.8-stable] ./configure --prefix=/usr/ [root@localhost asd] cd /opt/memcached-1.5.6 [root@localhost memcached-1.5.6] ./configure --with-libevent=/usr #主服務器上需要libevent的這個模塊 [root@localhost opt]# ln -s /usr/lib/libevent-2.1.so.6 /usr/lib64/libevent-2.1.so.6 #解壓出來magent會解壓出來以下幾個文件 [root@localhost asd] tar zxvf magent-0.5.tar.gz -C /opt/ ketama.c magent.c ketama.h Makefile [root@localhost opt] vi ketama.h #修改開頭兩個聲明，最後一行有#endif聲明不需要做修改 #ifndef SSIZE_MAX #define SSIZE_MAX 32767 #endif [root@localhost opt] vim Makefile #修改開頭聲明文件 LIBS = -levent -lm [root@localhost opt] make #把magent生成的文件讓系統能識別 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
在從服務器上安裝openssh-clients遠程連接
[root@localhost Packages] rpm -ivh openssh-clients-7.4p1-11.el7.x86_64.rpm warning: /mnt/Packages/openssh-clients-7.4p1-11.el7.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID f4a80eb5: NOKEY Preparing... ################################# [100%] package openssh-clients-7.4p1-11.el7.x86_64 is already installed
把主服務器上編譯產生的magent的文件遠程復制到從服務器上
[root@localhost opt] ls ketama.c ketama.o magent magent.o memcached-1.5.6 ketama.h libevent-2.1.8-stable magent.c Makefile [root@localhost opt] scp magent [email protected]:/usr/bin/ The authenticity of host ‘192.168.32.218 (192.168.32.218)‘ can‘t be established. ECDSA key fingerprint is SHA256:gJPuAr8ixvbw23RR67aEnt+w9zT1936PhJNzk0nD/Bg. ECDSA key fingerprint is MD5:1c:34:a1:74:e8:59:a3:54:7d:cd:61:bd:2d:7e:50:32. Are you sure you want to continue connecting (yes/no)? yes Warning: Permanently added ‘192.168.32.218‘ (ECDSA) to the list of known hosts. [email protected]‘s password: magent 100% 112KB 10.5MB/s 00:00
在主從服務器上安裝keepalived
#主從都要裝
! Configuration File for keepalived
global_defs {
notification_email {
[email protected]
[email protected]
[email protected]
}
notification_email_from [email protected]
smtp_server 192.168.200.1
smtp_connect_timeout 30
router_id MAGENT_HA
}
vrrp_script magent {
script "/opt/shell/magent.sh"
interval 2
}
vrrp_instance VI_1 {
state MASTER
interface ens33
virtual_router_id 52
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
track_script {
magent
}
virtual_ipaddress {
192.168.32.188
}
}
#下面多余的部分可以全部刪除
#把從服務器上的keepalived.conf配置文件用mv修改為備份文件
[root@localhost memcached-1.5.6]# cd /etc/keepalived/
[root@localhost keepalived]# ls
keepalived.conf
[root@localhost keepalived]# mv keepalived.conf keepalived.conf.bak
[root@localhost keepalived]# ls
keepalived.conf.bak
#用scp遠程復制主服務器上的keepalived.conf配置文件到從服務器上/etc/keeplived/底下
[root@localhost keepalived]# scp keepalived.conf [email protected]:/etc/keepalived/
[email protected]‘s password:
keepalived.conf 100% 634 309.0KB/s 00:00
#查看從服務器上有沒有這個配置文件
[root@localhost keepalived]# ls
keepalived.conf keepalived.conf.bak
#修改keepalived.conf配置文件
router_id 2 #改為2
state BACKUP #master改為BACKUP
priority 90 #優先級改為小於100
配置配置文件裏面的magent.sh腳本（註意路徑要與配置文件裏面路徑相同）
主
[root@localhost opt] mkdir shell
[root@localhost opt] cd shell/
[root@localhost shell] vim 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 192.168.32.188 -p 12000 -s 192.168.32.219:11211 -b 192.168.32.218:11211
else
pkill -9 magent
fi
-n 51200 //定義用戶最大連接數
-l 192.168.x.x //指定虛擬IP
-p 12000 //指定端口號
-s //指定主緩存服務器
-b //指頂從緩存服務器
[root@localhost shell] chmod +x magent.sh
從
#!/bin/bash
K=`ip addr | grep 192.168.32.188 | grep -v grep | wc -l`
if [ $K -gt 0 ]; then
magent -u root -n 51200 -l 192.168.175.188 -p 12000 -s 192.168.175.128:11211 -b 192.168.175.132:11211
else
pkill -9 magent
fi
開啟keepalived
[root@localhost shell] systemctl start keepalived.service
#用ip addr查看虛擬ip有沒有綁定成功
[root@localhost shell]# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 00:0c:29:b9:51:08 brd ff:ff:ff:ff:ff:ff
inet 192.168.32.219/24 brd 192.168.32.255 scope global dynamic ens33
valid_lft 1238sec preferred_lft 1238sec
inet 192.168.32.188/32 scope global ens33
valid_lft forever preferred_lft forever
inet6 fe80::20c:29ff:feb9:5108/64 scope link
valid_lft forever preferred_lft forever
#查看12000端口在主服務器上有沒有開啟
[root@localhost shell]# netstat -ntap
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 192.168.32.219:11211 0.0.0.0:* LISTEN 27084/memcached
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 1005/sshd
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 1469/master
tcp 0 0 192.168.32.188:12000 0.0.0.0:* LISTEN 27418/magent
tcp 0 0 192.168.32.219:55552 192.168.32.1:445 ESTABLISHED -
tcp 0 52 192.168.32.219:22 192.168.32.1:52961 ESTABLISHED 26820/sshd: root@pt
tcp6 0 0 :::22 :::* LISTEN 1005/sshd
tcp6 0 0 ::1:25 :::* LISTEN 1469/master
這個12000端口是虛擬端口用於登陸使用
從服務器沒有這個端口
如果主服務器down掉後
12000虛擬端口會自動綁定到從服務器上用於
不影響登陸登錄Memcached服務器
memcached -m 512k -u root -d -l 192.168.32.219 主 -p 11211
memcached -m 512k -u root -d -l 192.168.32.218 從 -p 11211
netstat -ntap |grep 11211
有11211端口表示服務開啟成功Memcache緩存服務器存儲數據應用
add username 0 0 7 //不進行壓縮和序列化標識 數據過期時間為永不過期 標識號是7就需要輸入7位數。
example //輸入數據
get username //獲取數據
VALUE username 0 7
example
gets username
VALUE username 0 7 1 //最後一位是更新因子會自增1
example
set username 0 0 10 //更新信息，若鍵名不存在，則自行添加
everything
replace username 0 0 8 //更新信息，若鍵名不存在，則報錯
12345678
gets username
VALUE username 0 8 4
12345678
cas username 0 0 7 4 //檢查更新，更新因子相等則更新否則返回EXISTS
lodging
STORED
append username 0 0 7 //鍵值後追加數據
example
STORED
prepend username 0 0 2 //鍵值前追加數據
un
STORED
delete username
flush_all //清除所有緩存數據
OK
stats //顯示狀態信息
quit //退出
Memcached高可用群集