centos7+pacemaker+corosync+haproxy实现高可用

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1.架构准备

系统是centos7-1511,实验需要准备4台主机,虚拟机也行,架构如下:

2 .系统环境配置

ha1:192.168.0.11

ha2:192.168.0.12

以下的安装配置分别在这2台机器上进行。

1.关闭防火墙和SELinux

systemctl disable firewalld
systemctl stop firewalld
iptables –F
 
修改配置文件vim /etc/selinux/config,将SELINU置为disabled
也可使用命令:
sed -i '/SELINUX/s/enforcing/disabled/' /etc/selinux/config

2.2台主机分别修改hostname为ha1和ha2
hostnamectl --static --transient  set-hostname ha1
hostnamectl --static --transient  set-hostname ha2

3.配置主机名节点名称很关键,集群每个节的名称都得能互相解析。/etc/hosts中的主机名配置结果必须跟”uname -n”的解析的结果一致。
vim /etc/hosts 
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.0.11 ha1
192.168.0.12 ha2

4.同步时间
yum install ntp -y
ntpdate cn.pool.ntp.org

5.双机互信
ha1:
ssh-keygen  -t rsa -f ~/.ssh/id_rsa  -P ''
scp /root/.ssh/id_rsa.pub root@ha2:/root/.ssh/authorized_keys
ha2:
ssh-keygen -t rsa -f ~/.ssh/id_rsa -P ''
scp /root/.ssh/id_rsa.pub root@ha1:/root/.ssh/authorized_keys
 
 

3.安装配置pacemaker+corosync

1.安装pacemaker+corosync

在主机192.168.0.11和192.168.0.12上分别安装相关服务,以下步骤分别在2台机器上执行:

yum install pcs pacemaker corosync fence-agents-all -y
 

2.启动pcsd服务(开机自启动)

systemctl start pcsd.service
systemctl enable pcsd.service

3.创建集群用户

passwdhacluster(此用户在安装pcs时候会自动创建)


以上都是在2台主机上执行


4.集群各节点之间认证

pcs cluster auth ha1 ha2(此处需要输入的用户名必须为pcs自动创建的hacluster,其他用户不能添加成功


5.创建并启动名为my_cluster的集群,其中ha1 ha2为集群成员

pcs cluster setup --start --name my_cluster ha1 ha2

6.设置集群自启动
pcs cluster enable --all

7.查看集群状态

pcs cluster status


psaux|greppacemaker


检验Corosync的安装及当前corosync状态:

corosync-cfgtool-s

corosync-cmapctl| grep members

pcs status corosync

检查配置是否正确(假若没有输出任何则配置正确):

crm_verify -L -V

错误,禁用STONITH:

pcs property set stonith-enabled=false

无法仲裁时候,选择忽略:

pcs property set no-quorum-policy=ignore


配置VIP资源:

pcs resource create vip ocf:heartbeat:IPaddr2 params ip=192.168.0.98 nic='enp0s3' cidr_netmask='23' broadcast='192.168.1.255' op monitor interval=5s timeout=20s on-fail=restart

配置HAProxy

pcs resource create haproxy systemd:haproxy op monitor interval="5s"
 

如果为找到资源,先安装,然后再创建

yum install haproxy -y
pcs resource create haproxy systemd:haproxy op monitor interval="5s"
 
 
 
 

定义运行的HAProxy和VIP必须在同一节点上:

pcs constraint colocation add vip haproxy INFINITY

定义约束,先启动VIP之后才启动HAProxy:

pcs constraint order vip then haproxy

备注:配置资源多节点启动,添加--clone

4.配置haproxy

 vim /etc/haproxy/haproxy.cfg

这里的配置就不详细说了,本环境配置如下:
@H_404_262@global # to have these messages end up in /var/log/haproxy.log you will # need to: # # 1) configure syslog to accept network log events. This is done # by adding the '-r' option to the SYSLOGD_OPTIONS in # /etc/sysconfig/syslog # # 2) configure local2 events to go to the /var/log/haproxy.log # file. A line like the following can be added to # /etc/sysconfig/syslog # # local2.* /var/log/haproxy.log # log 127.0.0.1 local2 chroot /var/lib/haproxy pidfile /var/run/haproxy.pid maxconn 4000 user haproxy group haproxy daemon # turn on stats unix socket stats socket /var/lib/haproxy/stats #--------------------------------------------------------------------- # common defaults that all the 'listen' and 'backend' sections will # use if not designated in their block #--------------------------------------------------------------------- defaults mode http log global option httplog option dontlognull option http-server-close option forwardfor except 127.0.0.0/8 option redispatch retries 3 timeout http-request 10s timeout queue 1m timeout connect 10s timeout client 1m timeout server 1m timeout http-keep-alive 10s timeout check 10s maxconn 3000 listen admin_stats stats enable bind *:8080 #监听的ip端口号 mode http #开关 option httplog log global stats refresh 30s #统计页面自动刷新时间 stats uri /haproxy #访问的uri ip:8080/haproxy stats realm haproxy stats auth admin:admin #认证用户名和密码 stats hide-version #隐藏HAProxy的版本号 stats admin if TRUE #管理界面,如果认证成功了,可通过webui管理节点 listen galera_cluster bind *:8888 balance roundrobin option tcpka option httpchk option tcplog server controller1 192.168.0.21:80 check port 80 inter 2000 rise 2 fall 5 server controller2 192.168.0.22:80 check port 80 inter 2000 rise 2 fall 5

haprxy服务不用启动,会随着corosync一起启动。
最后2台的server自己安装个httpd(yum install httpd -y)就可以了。

最后查看集群状态
pcs status


UI查看集群状态
https:192.168.0.10:2224
使用集群的账号hacluster登录,然后Add Existing

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