centos7 memcached+magent+keepalived集群
111,222均部署keepalived,magent,memcached
keepalived 111为主机，222为备机
其中，111上magent以本地memcache为主，222为备用
222上magen以本地memcache为主，111为备用
安装memcached
安装：yum -y install memcached
查看配置：cat /etc/sysconfig/memcached, 通过ip+下图port可远程连接
PORT="11211"
USER="memcached"
MAXCONN="1024"
CACHESIZE="64"
OPTIONS=""
启动： systemctl start memcached
停止： systemctl stop memcached
重启： systemctl restart memcached
连接memcached测试
cmd命令窗口：telnet 10.0.0.111 11211
(回车)
ERROR
add aaa 0 0 4
1111
STORED
get aaa
VALUE aaa 0 4
1111
END
安装libevent(略，下次装时补充)
安装magent
mkdir /opt/magent
cd magent
wget https://files.cnblogs.com/files/lurenjia1994/magent.tar.gz
tar xzvf magent.tar.gz
make进行安装
可能错误1：
magent.c: 在函数‘writev_list’中:
magent.c::: 错误：‘SSIZE_MAX’未声明(在此函数内第一次使用)
if (toSend > SSIZE_MAX ||
^
magent.c::: 附注：每个未声明的标识符在其出现的函数内只报告一次
make: *** [magent.o] 错误
解决方法：
vi ketama.h 在头部加入以下代码
#ifndef SSIZE_MAX
#define SSIZE_MAX 32767
#endif
可能错误2：
gcc -Wall -g -O2 -I/usr/local/include -m64 -c -o magent.o magent.c
gcc -Wall -g -O2 -I/usr/local/include -m64 -c -o ketama.o ketama.c
gcc -Wall -g -O2 -I/usr/local/include -m64 -o magent magent.o ketama.o /usr/lib64/libevent.a /usr/lib64/libm.a
gcc: 错误：/usr/lib64/libevent.a：没有那个文件或目录
gcc: 错误：/usr/lib64/libm.a：没有那个文件或目录
make: *** [magent] 错误
解决方法：
ln -s /usr/lib64/libm.so /usr/lib64/libm.a
ln -s /usr/lib64/libevent.so /usr/lib64/libevent.a
检查是否安装成功
[root@localhost magent]# cp magent /usr/bin/
[root@localhost magent]# magent
please provide -s "ip:port" argument memcached agent v0. Build-Date: Aug ::
Usage:
-h this message
-u uid
-g gid
-p port, default is . ( to disable tcp support)
-s ip:port, set memcached server ip and port
-b ip:port, set backup memcached server ip and port
-l ip, local bind ip address, default is 0.0.0.0
-n number, set max connections, default is
-D don't go to background
-k use ketama key allocation algorithm
-f file, unix socket path to listen on. default is off
-i number, set max keep alive connections for one memcached server, default is
-v verbose
启动magent
[root@centos7 magent]# magent -u root -n -l 10.0.0.111 -p -s 10.0.0.111: -b 10.0.0.222:
[root@centos7 magent]# ps -aux|grep magent
root 0.0 0.0 ? Ss : : magent -u root -n -l 10.0.0.111 -p -s 10.0.0.111: -b 10.0.0.222:
root 0.0 0.0 pts/ S+ : : grep --color=auto magent
测试magent
1.连接magent节点
现象：通过magent节点可以取到所有主节点的数据
telnet 10.0.0.111 UNSUPPORTED COMMAND
get aaa 前面在测试memcache连接设置的aaa,这里取值成功
VALUE aaa END
set b STORED
2.连接主节点
现象：可以取到所有magent节点存入的数据
ERROR
get aaa
VALUE aaa END
get b
VALUE b END
set c
cccc
STORED
3.连接备份节点
现象：可以取到所有magent节点存入的数据
ERROR
get aaa
END
get b #只能取到在magent节点设置的值，其他取不到
VALUE b END
get c
END
4.关掉主节点的memcache进程
现象：通过magent节点可以取到所有备份节点的数据
[root@centos7 magent]# systemctl stop memcached
[root@centos7 magent]# ps -aux|grep memcached
root 0.0 0.0 pts/ S+ : : grep --color=auto memcached cmd连接magent节点
telnet 10.0.0.111 UNSUPPORTED COMMAND
get aaa
END
get b
VALUE b END
get c
END
5.再开启主节点memcached
现象：取不到前面设置的所有值，因为重启以后，主节点数据全部清空，虽然备份节点有数据，但是主节点在备份节点不会生效
UNSUPPORTED COMMAND
get a
END
get aaa
END
get b
END
get c
END
安装keepalived(当10.0.0.111上的magent挂掉时，自动切换到10.0.0.222的magent)
yum install keepalived
修改keepalived配置
本文配置为在这个基础上添加的配置，请忽略多余部分keepalive+nginx 热备跟负载均衡
keepalived配置
! 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 LVS_DEVEL
vrrp_skip_check_adv_addr
#vrrp_strict
vrrp_garp_interval 0
vrrp_gna_interval 0
}
vrrp_script chk_nginx {
script "/etc/keepalived/chk_nginx.sh"
interval 2
}
vrrp_script chk_magent {
script "/etc/keepalived/chk_magent.sh"
interval 2
}
vrrp_instance VI_1 {
state MASTER
interface ens192
virtual_router_id 51
priority 50
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
10.0.0.233
}
notify_master "/usr/bin/python2.7 /etc/keepalived/send.py 1499418300@qq.com 报！111成为主机！ 报！111成为主机！"
notify_fault "/usr/bin/python2.7 /etc/keepalived/send.py 1499418300@qq.com 报！111已挂！ 10.0.0.111故障！请尽快修复！"
track_script {
chk_nginx
}
}
vrrp_instance VI_2 {
state MASTER
interface ens192
virtual_router_id 52
priority 50
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
10.0.0.234
}
track_script {
chk_magent
}
}
其中/etc/keepalived目录下的chk_magent.sh
#!/bin/bash
run=`ps -C magent --no-header | wc -l`
if [ $run -eq 0 ]; then
magent -u root -n 51200 -l 10.0.0.234 -p 12000 -s 10.0.0.111:11211 -b 10.0.0.222:11211
sleep 3
if [ `ps -C magent --no-header | wc -l` -eq 0 ]; then
systemctl stop keepalived
fi
fi
遇到问题1
绑定不了虚拟vip排查，没有发现虚拟ip 10.0.0.234
只有vrid 51的组播，没有52的组播 [root@centos7 keepalived]# tcpdump -nn -c -i any host 224.0.0.18
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on any, link-type LINUX_SLL (Linux cooked), capture size bytes
::43.008689 IP 10.0.0.111 > 224.0.0.18: VRRPv2, Advertisement, vrid , prio , authtype simple, intvl 1s, length
::44.009046 IP 10.0.0.111 > 224.0.0.18: VRRPv2, Advertisement, vrid , prio , authtype simple, intvl 1s, length
::45.009174 IP 10.0.0.111 > 224.0.0.18: VRRPv2, Advertisement, vrid , prio , authtype simple, intvl 1s, length
::46.009534 IP 10.0.0.111 > 224.0.0.18: VRRPv2, Advertisement, vrid , prio , authtype simple, intvl 1s, length
::47.009703 IP 10.0.0.111 > 224.0.0.18: VRRPv2, Advertisement, vrid , prio , authtype simple, intvl 1s, length
::48.010830 IP 10.0.0.111 > 224.0.0.18: VRRPv2, Advertisement, vrid , prio , authtype simple, intvl 1s, length
::49.010960 IP 10.0.0.111 > 224.0.0.18: VRRPv2, Advertisement, vrid , prio , authtype simple, intvl 1s, length
::50.012050 IP 10.0.0.111 > 224.0.0.18: VRRPv2, Advertisement, vrid , prio , authtype simple, intvl 1s, length
::51.012178 IP 10.0.0.111 > 224.0.0.18: VRRPv2, Advertisement, vrid , prio , authtype simple, intvl 1s, length
::52.012727 IP 10.0.0.111 > 224.0.0.18: VRRPv2, Advertisement, vrid , prio , authtype simple, intvl 1s, length
::53.012828 IP 10.0.0.111 > 224.0.0.18: VRRPv2, Advertisement, vrid , prio , authtype simple, intvl 1s, length
::54.013334 IP 10.0.0.111 > 224.0.0.18: VRRPv2, Advertisement, vrid , prio , authtype simple, intvl 1s, length
::55.013481 IP 10.0.0.111 > 224.0.0.18: VRRPv2, Advertisement, vrid , prio , authtype simple, intvl 1s, length
::56.013858 IP 10.0.0.111 > 224.0.0.18: VRRPv2, Advertisement, vrid , prio , authtype simple, intvl 1s, length
::57.014023 IP 10.0.0.111 > 224.0.0.18: VRRPv2, Advertisement, vrid , prio , authtype simple, intvl 1s, length
::58.014457 IP 10.0.0.111 > 224.0.0.18: VRRPv2, Advertisement, vrid , prio , authtype simple, intvl 1s, length
::59.014604 IP 10.0.0.111 > 224.0.0.18: VRRPv2, Advertisement, vrid , prio , authtype simple, intvl 1s, length
::00.015002 IP 10.0.0.111 > 224.0.0.18: VRRPv2, Advertisement, vrid , prio , authtype simple, intvl 1s, length
::01.015815 IP 10.0.0.111 > 224.0.0.18: VRRPv2, Advertisement, vrid , prio , authtype simple, intvl 1s, length
::02.016914 IP 10.0.0.111 > 224.0.0.18: VRRPv2, Advertisement, vrid , prio , authtype simple, intvl 1s, length
packets captured
packets received by filter
packets dropped by kernel
查看日志：cat /var/log/message
似乎是因为脚本导致vip2启动失败
Aug :: centos7 Keepalived_vrrp[]: Sending gratuitous ARP on ens192 for 10.0.0.233
Aug :: centos7 Keepalived_vrrp[]: Sending gratuitous ARP on ens192 for 10.0.0.233
Aug :: centos7 Keepalived_vrrp[]: Sending gratuitous ARP on ens192 for 10.0.0.233
Aug :: centos7 Keepalived_vrrp[]: Sending gratuitous ARP on ens192 for 10.0.0.233
Aug :: centos7 Keepalived_vrrp[]: /etc/keepalived/chk_magent.sh exited due to signal
Aug :: centos7 Keepalived_vrrp[]: /etc/keepalived/chk_magent.sh exited due to signal
Aug :: centos7 Keepalived_vrrp[]: /etc/keepalived/chk_magent.sh exited due to signal
Aug :: centos7 Keepalived_vrrp[]: /etc/keepalived/chk_magent.sh exited due to signal
Aug :: centos7 Keepalived_vrrp[]: /etc/keepalived/chk_magent.sh exited due to signal
Aug :: centos7 Keepalived_vrrp[]: /etc/keepalived/chk_magent.sh exited due to signal
Aug :: centos7 Keepalived_vrrp[]: /etc/keepalived/chk_magent.sh exited due to signal
Aug :: centos7 Keepalived_vrrp[]: /etc/keepalived/chk_magent.sh exited due to signal
Aug :: centos7 Keepalived_vrrp[]: /etc/keepalived/chk_magent.sh exited due to signal
Aug :: centos7 Keepalived_vrrp[]: /etc/keepalived/chk_magent.sh exited due to signal
Aug :: centos7 Keepalived_vrrp[]: /etc/keepalived/chk_magent.sh exited due to signal
Aug :: centos7 Keepalived_vrrp[]: /etc/keepalived/chk_magent.sh exited due to signal
Aug :: centos7 Keepalived_vrrp[]: /etc/keepalived/chk_magent.sh exited due to signal
Aug :: centos7 Keepalived_vrrp[]: /etc/keepalived/chk_magent.sh exited due to signal
Aug :: centos7 Keepalived_vrrp[]: /etc/keepalived/chk_magent.sh exited due to signal
Aug :: centos7 Keepalived_vrrp[]: /etc/keepalived/chk_magent.sh exited due to signal
Aug :: centos7 Keepalived_vrrp[]: /etc/keepalived/chk_magent.sh exited due to signal
Aug :: centos7 Keepalived_vrrp[]: /etc/keepalived/chk_magent.sh exited due to signal
Aug :: centos7 Keepalived_vrrp[]: /etc/keepalived/chk_magent.sh exited due to signal
Aug :: centos7 Keepalived_vrrp[]: /etc/keepalived/chk_magent.sh exited due to signal
Aug :: centos7 Keepalived_vrrp[]: /etc/keepalived/chk_magent.sh exited due to signal
难道他是先运行脚本，再开启vip2?
于是把脚本中的10.0.0.234改成10.0.0.111，再重启keepalived，再查看ip，发现已经有10.0.0.234了
[root@centos7 keepalived]# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
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: ens192: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether 00:0c:29:c8:03:3f brd ff:ff:ff:ff:ff:ff
inet 10.0.0.111/24 brd 10.0.0.255 scope global noprefixroute ens192
valid_lft forever preferred_lft forever
inet 10.0.0.233/32 scope global ens192
valid_lft forever preferred_lft forever
inet 10.0.0.234/32 scope global ens192
valid_lft forever preferred_lft forever
inet6 fe80::7e90:403b:465:db6c/64 scope link noprefixroute
valid_lft forever preferred_lft forever
3: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default qlen 1000
link/ether 52:54:00:70:99:88 brd ff:ff:ff:ff:ff:ff
inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
valid_lft forever preferred_lft forever
4: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast master virbr0 state DOWN group default qlen 1000
link/ether 52:54:00:70:99:88 brd ff:ff:ff:ff:ff:ff
于是在vip1中设置两个虚拟ip：10.0.0.233，10.0.0.234，vip2中不设置虚拟ip，检测脚本启动magent时绑定10.0.0.234，经测试10.0.0.111上部署成功
遇到问题2
10.0.0.222启动keepalived时，magent似乎启动失败
排查：
1.关掉10.0.0.111上的keepalived
2.给111上的keepalived.conf跟chk_magent.sh覆盖掉222对应文件
3.启动
systemctl start keepalived
4.检查地址
[root@localhost keepalived]# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
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: ens192: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether 00:0c:29:59:17:90 brd ff:ff:ff:ff:ff:ff
inet 10.0.0.222/24 brd 10.0.0.255 scope global noprefixroute ens192
valid_lft forever preferred_lft forever
inet 10.0.0.233/32 scope global ens192
valid_lft forever preferred_lft forever
inet 10.0.0.234/32 scope global ens192
valid_lft forever preferred_lft forever
inet6 fe80::5e69:554d:d28e:dbb5/64 scope link noprefixroute
valid_lft forever preferred_lft forever
3: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default qlen 1000
link/ether 52:54:00:59:38:b4 brd ff:ff:ff:ff:ff:ff
inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
valid_lft forever preferred_lft forever
4: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast master virbr0 state DOWN group default qlen 1000
link/ether 52:54:00:59:38:b4 brd ff:ff:ff:ff:ff:ff
5.检查magent服务
[root@localhost keepalived]# ps -aux|grep magent
root 23443 0.0 0.0 115296 1476 ? S 15:21 0:00 /bin/bash /etc/keepalived/chk_magent.sh
root 23457 0.0 0.0 112720 968 pts/0 S+ 15:21 0:00 grep --color=auto magent 通过./chk_magent.sh可以正确启动
正确启动应该是这样
[root@localhost keepalived]# ./chk_magent.sh
[root@localhost keepalived]# ps -aux|grep magent
root 24142 0.0 0.0 11948 612 ? Ss 15:22 0:00 magent -u root -n 51200 -l 10.0.0.234 -p 12000 -s 10.0.0.111:11211 -b 10.0.0.222:11211
root 24185 0.0 0.0 112720 972 pts/0 S+ 15:22 0:00 grep --color=auto magent
6.检查系统日志
Aug 23 15:22:19 localhost Keepalived_vrrp[22337]: /etc/keepalived/chk_magent.sh exited due to signal 15
Aug 23 15:22:19 localhost setroubleshoot: failed to retrieve rpm info for /usr/bin/magent
Aug 23 15:22:19 localhost setroubleshoot: SELinux is preventing /usr/bin/magent from name_bind access on the tcp_socket port 12000. For complete SELinux messages run: sealert -l 7a3a5f2e-5328-4dd4-88d6-bdefea289425
Aug 23 15:22:19 localhost python: SELinux is preventing /usr/bin/magent from name_bind access on the tcp_socket port 12000.#012#012***** Plugin bind_ports (92.2 confidence) suggests ************************#012 脚本启动失败了，似乎是防火墙
7.关掉SELinux
[root@localhost keepalived]# setenforce 0
[root@localhost keepalived]# getenforce
Permissive
8.重启keepalived
[root@localhost keepalived]# systemctl stop keepalived
[root@localhost keepalived]# pkill magent
[root@localhost keepalived]# ps -aux|grep magent
root 27598 0.0 0.0 112720 972 pts/0 S+ 15:32 0:00 grep --color=auto magent
[root@localhost keepalived]# systemctl start keepalived
[root@localhost keepalived]# ps -aux|grep magent
root 27647 0.0 0.0 11948 616 ? Ss 15:32 0:00 magent -u root -n 51200 -l 10.0.0.234 -p 12000 -s 10.0.0.111:11211 -b 10.0.0.222:11211
root 27699 0.0 0.0 112720 972 pts/0 S+ 15:32 0:00 grep --color=auto magent 果然是防火墙！
9.SELinux放出magent
比较复杂，以后再补
最终配置
10.0.0.111上的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 LVS_DEVEL
vrrp_skip_check_adv_addr
#vrrp_strict
vrrp_garp_interval 0
vrrp_gna_interval 0
}
vrrp_script chk_nginx {
script "/etc/keepalived/chk_nginx.sh"
interval 2
}
vrrp_script chk_magent {
script "/etc/keepalived/chk_magent.sh"
interval 2
}
vrrp_instance VI_1 {
state MASTER
interface ens192
virtual_router_id 51
priority 50
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
10.0.0.233
10.0.0.234
}
notify_master "/usr/bin/python2.7 /etc/keepalived/send.py 1499418300@qq.com 报！111成为主机！ 报！111成为主机！"
notify_fault "/usr/bin/python2.7 /etc/keepalived/send.py 1499418300@qq.com 报！111已挂！ 10.0.0.111故障！请尽快修复！"
track_script {
chk_nginx
}
}
vrrp_instance VI_2 {
state MASTER
interface ens192
virtual_router_id 52
priority 50
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
# 10.0.0.234
}
track_script {
chk_magent
}
}
10.0.0.111上的chk_magent.sh
#!/bin/bash
run=`ps -C magent --no-header | wc -l`
if [ $run -eq 0 ]; then
magent -u root -n 51200 -l 10.0.0.234 -p 12000 -s 10.0.0.111:11211 -b 10.0.0.222:11211
sleep 3
if [ `ps -C magent --no-header | wc -l` -eq 0 ]; then
systemctl stop keepalived
fi
fi
10.0.0.222上的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 LVS_DEVEL
vrrp_skip_check_adv_addr
#vrrp_strict
vrrp_garp_interval 0
vrrp_gna_interval 0
}
vrrp_script chk_nginx {
script "/etc/keepalived/chk_nginx.sh"
interval 2
}
vrrp_script chk_magent {
script "/etc/keepalived/chk_magent.sh"
interval 2
}
vrrp_instance VI_1 {
state BACKUP
interface ens192
virtual_router_id 51
priority 30
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
10.0.0.233
10.0.0.234
}
notify_master "/usr/bin/python2.7 /etc/keepalived/send.py 1499418300@qq.com 报！222成为主机！ 报！222成为主机！"
notify_fault "/usr/bin/python2.7 /etc/keepalived/send.py 1499418300@qq.com 报！222已挂！ 10.0.0.222故障！请尽快修复！"
track_script {
chk_nginx
}
}
vrrp_instance VI_2 {
state BACKUP
interface ens192
virtual_router_id 52
priority 30
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
# 10.0.0.234
}
track_script {
chk_magent
}
}
10.0.0.222上的chk_magent.sh
#!/bin/bash
run=`ps -C magent --no-header | wc -l`
if [ $run -eq 0 ]; then
magent -u root -n 51200 -l 10.0.0.234 -p 12000 -s 10.0.0.222:11211 -b 10.0.0.111:11211
sleep 3
if [ `ps -C magent --no-header | wc -l` -eq 0 ]; then
systemctl stop keepalived
fi
fi
参考文档
memcached+magent+keepalived实现高可用群集
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