一：基础
1、基础搭建
所有个节点都做
[1]
name=1
baseurl=ftp://172.25.254.100/pub/media
enabled=1
gpgcheck=0
[2]
name=2
baseurl=ftp://172.25.254.100/pub/media/addons/HighAvailability
enabled=1
gpgcheck=0
hostnamectl set-hostname node1 更改主机名
hostnamectl set-hostname node2
cat /etc/hosts
172.25.254.100 node1
172.25.254.101 node2
各节点同步时间NTP，此处不在搭建
各节点需要ssh无密码密钥搭建（相互之间都需要）
2、防火墙配置
systemctl stop firewalld.service
systemctl disable firewalld.service
sed -i ‘/SELINUX/s/permissive/disabled/g‘ /etc/selinux/config
setenforce 0物理机也关
###firewall-cmd --permanent --add-service=high-availability
###firewall-cmd --reload
二、集群服务配置
1、装包启服务
yum -y install pcs pacemaker corosync fence-agents-all lvm2-cluster（存储的）
为了各个节点通讯，在每个节点创建相同账户和密码
echo 123456 |passwd --stdin hacluster 用户暂时不能改，除非知道该那个文件
服务启动
cp /etc/corosync/corosync.conf.example /etc/corosync/corosync.conf 防止起不来
systemctl start pcsd
systemctl enable pcsd
systemctl start pacemaker
systemctl enable pacemaker
systemctl start corosync
systemctl enable corosync
2、节点间验证
各个节点之间进行验证
pcs cluster auth node1 node2 。。。
账号hacluster
密码 123456
(pcs cluster auth node103 node102 node101 -u hacluster -p 123456)
3、创建并启动集群（单节点做）
pcs cluster setup --start --name xiang node1 node2 --force
设置集群开机启动
pcs cluster enable --name xiang
pcs cluster enable --all
查看状态
pcs status
pcs cluster status
pcs property set stonith-enabled=falsefence暂不用
三：服务配置
pcs resource list | grep 查服务
1、配置存储
查看iscsi的配置文档
mkfs.xfs /dev/sdb1 -f
重启另外一个节点使生效
pcs resource create FS ocf:heartbeat:Filesystem device="/dev/sdb1" directory="/mnt" fstype="xfs"
2、配置浮点IP
pcs resource create VIP ocf:heartbeat:IPaddr2 ip=172.25.254.170 cidr_netmask=24
pcs resource update VIP op monitor interval=15s
pcs resource show VIP
Resource: VIP (class=ocf provider=heartbeat type=IPaddr2)
Attributes: ip=172.25.254.170 cidr_netmask=24
Operations: start interval=0s timeout=20s (VIP-start-timeout-20s)
stop interval=0s timeout=20s (VIP-stop-timeout-20s)
monitor interval=15s (VIP-monitor-interval-15s)
pcs status
ping 172.25.254.170
3、配置服务apache
所有节点yum -y install httpd
确定开机为禁用状态
pcs resource create WEB ocf:heartbeat:apache
pcs resource show WEB
4、创建group，将必要的服务绑定
将IP和WEB resource捆绑到这个group中，使之作为一个整体在集群中切换
pcs resource show
VIP(ocf::heartbeat:IPaddr2):Started
WEB(ocf::heartbeat:apache):Stopped
pcs resource group add MyGroup VIP
pcs resource group add MyGroup WEB
pcs resource update WEB statusurl="http://172.25.254.170"
pcs resource disable WEB加组
pcs resource disable VIP
pcs resource group remove MyGroup WEB
pcs resource group remove MyGroup VIP
pcs resource group add MyGroup FS VIP WEB
pcs resource enable FS
pcs resource enable VIP
pcs resource enable WEB
pcs status
5、启动顺序
配置服务启动顺序，以避免出现资源冲突，语法：(pcs resource group add的时 候也可以根据加的顺序依次启动，此配置为可选)
pcs constraint order [action] then [action]
pcs constraint order start VIP then start WEB
pcs constraint show --full
在所有节点上安装数据库
yum -y install mariadb mariadb-*
systemctl disable mariadb
systemctl status mariadb 保持关闭
单个节点
pcs resource create mariadb ocf:heartbeat:mysql
pcs status
配置一个互为备份的双机环境，一个节点作为web，一个节点作为db，各自有自己的浮动IP，出现故障的时候互相切换
# pcs resource create VIP1 ocf:heartbeat:IPaddr2 ip=192.168.122.171 cidr_netmask=24 nic=eth0
# pcs resource group add MyGroup1 VIP1 DB(因为前面已经把DB添加到MyGroup组，所以需要先用pcs resource disable WEB; pcs resource diable DB;pcs resource group remove MyGroup DB; pcs resource enable WEB;才可以添加DB到MyGroup1 )
# pcs constraint location add server1 DB node1 1
# pcs constraint location add server1 VIP1 node1 1
# pcs constraint location add server2 FS node2 1
# pcs constraint location add server2 VIP node2 1
# pcs constraint location add server2 WEB node2 1
执行上述命令后，DB和VIP1将启动在node1上而剩下的FS VIP WEB将启动在node2上
timedatectl status
6、查看集群状态
corosync-cfgtool -s
Printing ring status.
Local node ID 1
RING ID 0
id = 192.168.17.132
status = ring 0 active with no faults
corosync-cmapctl | grep members
runtime.totem.pg.mrp.srp.members.1.ip (str) = r(0) ip(192.168.17.132)
runtime.totem.pg.mrp.srp.members.1.join_count (u32) = 1
runtime.totem.pg.mrp.srp.members.1.status (str) = joined
runtime.totem.pg.mrp.srp.members.2.config_version (u64) = 0
pcs status corosync
Membership information
----------------------
Nodeid Votes Name
1 1 controller1 (local)
3 1 controller3
2 1 controller2