安装ansible
安装ansible: [root@localhost ~]# tail -5 /etc/hosts 192.168.19.129 web129.yanglt.com web129 192.168.19.130 web130.yanglt.com web130 192.168.19.131 web131.yanglt.com web131 192.168.19.132 web132.yanglt.com web132 [root@localhost ~]# vim /etc/hosts [root@localhost ~]# yum -y install epel-release [root@localhost ~]# yum -y install ansible [root@localhost ~]# ssh-keygen [root@localhost ~]# for i in { 129..132} > do > ssh-copy-id web$i > done
安装LVS+Keepalived
主lvs_master:192.168.19.129 备lvs_backup:192.168.19.130 http(RS1):192.168.19.131 http(RS2):192.168.19.132 虚IP:192.168.19.150 virtual_ipaddress { 192.168.19.150 } } virtual_server 192.168.19.150 80 { 如上安装好ansible之后便于安装配置: [root@localhost ~]# cat /etc/ansible/hosts ## [webservers] ## alpha.example.org ## beta.example.org ## 192.168.1.100 ## 192.168.1.110 [webservers] web129.yanglt.com web130.yanglt.com web131.yanglt.com web132.yanglt.com [master] web129.yanglt.com web130.yanglt.com [web] web131.yanglt.com web132.yanglt.com
Master 安装keepalived+latest:
[root@localhost ~]# ansible master -m yum -a 'name=keepalived state=latest'
[root@localhost ~]# ansible master -m yum -a 'name=ipvsadm state=latest'
[root@web129 ~]#ipvsadm
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP localhost.localdomain:http rr
-> web131.yanglt.com:http Route 1 0 7
-> web132.yanglt.com:http Route 1 0 0
[root@web129 ~]# lsmod|grep ip_vs #检查当前加载的内核模块,看是否存在 ip_vs 模块,只有执行 ipvsadm 以后,才会在内核加载 ip_vs 模块
LVS的ip负载均衡技术就是通过IPVS模块来实现的
ip_vs_rr 12600 1
ip_vs 141092 3 ip_vs_rr
nf_conntrack 111302 1 ip_vs
libcrc32c 12644 2 xfs,ip_vs
[root@web129 ~]#
Slaver:
[root@localhost ~]# ansible master -m yum -a 'name=keepalived state=latest'
[root@localhost ~]# ansible master -m yum -a 'name=ipvsadm state=latest'
[root@web129 ~]# ipvsadm
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP localhost.localdomain:http rr
-> web131.yanglt.com:http Route 1 0 7
-> web132.yanglt.com:http Route 1 0 0
[root@web129 ~]# lsmod|grep ip_vs
ip_vs_rr 12600 1
ip_vs 141092 3 ip_vs_rr
nf_conntrack 111302 1 ip_vs
libcrc32c 12644 2 xfs,ip_vs
[root@web129 ~]#
MASTER:配置如下 [root@web129 ~]# cat /etc/keepalived/keepalived.conf ! Configuration File for keepalived global_defs { notification_email { [email protected] [email protected] [email protected] } notification_email_from [email protected] smtp_server 127.0.0.1 smtp_connect_timeout 30 router_id LVS_DEVEL } vrrp_instance VI_1 { state MASTER interface ens33 virtual_router_id 51 priority 100 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 192.168.19.200 } } virtual_server 192.168.19.200 80 { delay_loop 6 lb_algo rr lb_kind DR nat_mask 255.255.255.0 persistence_timeout 0 protocol TCP real_server 192.168.19.131 80 { weight 1 HTTP_GET { url { path / status_code 200 } connect_timeout 3 nb_get_retry 3 delay_before_retry 3 } } real_server 192.168.19.132 80 { weight 1 HTTP_GET { url { path / status_code 200 } connect_timeout 3 nb_get_retry 3 delay_before_retry 3 } } } [root@web129 ~]# slave配置如下: [root@web130 ~]# cat /etc/keepalived/keepalived.conf ! Configuration File for keepalived global_defs { notification_email { [email protected] [email protected] [email protected] } notification_email_from [email protected] smtp_server 127.0.0.1 smtp_connect_timeout 30 router_id LVS_DEVEL } vrrp_instance VI_1 { state BACKUP interface ens33 virtual_router_id 51 priority 50 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 192.168.19.200 } } virtual_server 192.168.19.200 80 { delay_loop 6 lb_algo rr lb_kind DR nat_mask 255.255.0.0 persistence_timeout 50 protocol TCP real_server 192.168.19.131 80 { weight 1 HTTP_GET { url { path / status_code 200 } connect_timeout 3 nb_get_retry 3 delay_before_retry 3 } } real_server 192.168.19.132 80 { weight 1 HTTP_GET { url { path / status_code 200 } connect_timeout 3 nb_get_retry 3 delay_before_retry 3 } } } [root@web130 ~]# 两台RS服务器上执行如下脚本,
[root@web131 ~]# cat lvs_client.sh #!/bin/bash #description : start realserver VIP=192.168.19.200 . /etc/rc.d/init.d/functions case "$1" in start) echo " start LVS of REALServer" /sbin/ifconfig lo:0 $VIP broadcast $VIP netmask 255.255.255.255 up echo "1" >/proc/sys/net/ipv4/conf/lo/arp_ignore echo "2" >/proc/sys/net/ipv4/conf/lo/arp_announce echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce ;; stop) /sbin/ifconfig lo:0 down echo "close LVS Directorserver" echo "0" >/proc/sys/net/ipv4/conf/lo/arp_ignore echo "0" >/proc/sys/net/ipv4/conf/lo/arp_announce echo "0" >/proc/sys/net/ipv4/conf/all/arp_ignore echo "0" >/proc/sys/net/ipv4/conf/all/arp_announce ;; *) echo "Usage: $0 {start|stop}" exit 1 esac [root@web131 ~]# 重启keepalived: [root@web129 ~]# systemctl restart keepalived.service 看到有如下进程即可: [root@web129 ~]# ps aux | grep keepalived root 2391 0.0 0.1 118080 1368 ? Ss 23:03 0:00 /usr/sbin/keepalived -D root 2392 0.0 0.3 120324 3044 ? S 23:03 0:00 /usr/sbin/keepalived -D root 2393 0.0 0.2 120204 2352 ? S 23:03 0:00 /usr/sbin/keepalived -D root 2411 0.0 0.0 112664 976 pts/0 S+ 23:17 0:00 grep --color=auto keepalived [root@web129 ~]# [root@web129 ~]# ip a 1: lo: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: mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:0c:29:82:86:6c brd ff:ff:ff:ff:ff:ff inet 192.168.19.129/24 brd 192.168.19.255 scope global ens33 valid_lft forever preferred_lft forever inet 192.168.19.200/32 scope global ens33 valid_lft forever preferred_lft forever inet6 fe80::20c:29ff:fe82:866c/64 scope link valid_lft forever preferred_lft forever [root@web129 ~]#
做端口转发:未测试
[root@web129 ~]# echo "1">/proc/sys/net/ipv4/ip_forward
[root@web130 ~]# echo "1">/proc/sys/net/ipv4/ip_forward
参考资料: $ vi /etc/keepalived/keepalived.conf 配置信息如下 ! Configuration File for keepalived global_defs { notification_email { [email protected] #设置报警邮件地址,可以设置多个,每行一个。 [email protected] #需开启本机的sendmail服务 [email protected] } notification_email_from [email protected] #设置邮件的发送地址 smtp_server 127.0.0.1 #设置smtp server地址 smtp_connect_timeout 30 #设置连接smtp server的超时时间 router_id LVS_DEVEL #表示运行keepalived服务器的一个标识。发邮件时显示在邮件主题的信息 } vrrp_instance VI_1 { state MASTER #指定keepalived的角色,MASTER表示此主机是主服务器,BACKUP表示此主机是备用服务器 interface enp0s3 #指定HA监测网络的接口 virtual_router_id 51 #虚拟路由标识,这个标识是一个数字,同一个vrrp实例使用唯一的标识。即同一vrrp_instance下,MASTER和BACKUP必须是一致的 priority 100 #定义优先级,数字越大,优先级越高,在同一个vrrp_instance下,MASTER的优先级必须大于BACKUP的优先级 advert_int 1 #设定MASTER与BACKUP负载均衡器之间同步检查的时间间隔,单位是秒 authentication { #设置验证类型和密码 auth_type PASS #设置验证类型,主要有PASS和AH两种 auth_pass 1111 #设置验证密码,在同一个vrrp_instance下,MASTER与BACKUP必须使用相同的密码才能正常通信 } virtual_ipaddress { #设置虚拟IP地址,可以设置多个虚拟IP地址,每行一个 192.168.137.100 } } virtual_server 192.168.137.100 80 { #设置虚拟服务器,需要指定虚拟IP地址和服务端口,IP与端口之间用空格隔开 delay_loop 6 #设置运行情况检查时间,单位是秒 lb_algo rr #设置负载调度算法,这里设置为rr,即轮询算法 lb_kind DR #设置LVS实现负载均衡的机制,有NAT、TUN、DR三个模式可选 nat_mask 255.255.255.0 persistence_timeout 0 #会话保持时间,单位是秒。这个选项对动态网页是非常有用的,为集群系统中的session共享提供了一个很好的解决方案。 #有了这个会话保持功能,用户的请求会被一直分发到某个服务节点,直到超过这个会话的保持时间。 #需要注意的是,这个会话保持时间是最大无响应超时时间,也就是说,用户在操作动态页面时,如果50秒内没有执行任何操作 #那么接下来的操作会被分发到另外的节点,但是如果用户一直在操作动态页面,则不受50秒的时间限制 protocol TCP #指定转发协议类型,有TCP和UDP两种 real_server 192.168.137.5 80 { #配置服务节点1,需要指定real server的真实IP地址和端口,IP与端口之间用空格隔开 weight 1 #配置服务节点的权值,权值大小用数字表示,数字越大,权值越高,设置权值大小可以为不同性能的服务器 #分配不同的负载,可以为性能高的服务器设置较高的权值,而为性能较低的服务器设置相对较低的权值,这样才能合理地利用和分配系统资源 TCP_CHECK { #realserver的状态检测设置部分,单位是秒 connect_timeout 3 #表示3秒无响应超时 nb_get_retry 3 #表示重试次数 delay_before_retry 3 #表示重试间隔 connect_port 80 } } real_server 192.168.137.6 80 { weight 1 TCP_CHECK { connect_timeout 3 nb_get_retry 3 delay_before_retry 3 connect_port 80 } } }
测试Lvs+Keepalived
测试: [root@localhost ~]# curl 192.168.19.200 this is server1 [root@localhost ~]# curl 192.168.19.200 this is server2 [root@localhost ~]# curl 192.168.19.200 this is server1 [root@localhost ~]# curl 192.168.19.200 this is server2 [root@localhost ~]# 停掉RS2的httpd服务: [root@localhost ~]# curl 192.168.19.200 this is server1 [root@localhost ~]# curl 192.168.19.200 curl: (7) Failed connect to 192.168.19.200:80; 拒绝连接 [root@localhost ~]# curl 192.168.19.200 this is server1 [root@localhost ~]# curl 192.168.19.200 this is server1 [root@localhost ~]# curl 192.168.19.200