标签：ha高可用集群
实验环境：火墙 selinux关闭 实验机时间同步 各节点解析完整
配置好yum源：
[source]
name=Red Hat Enterprise Linux $releasever - $basearch - Source
baseurl=http://172.25.60.250/rhel6
gpgcheck=0
[HighAvailability]
name=Red Hat Enterprise Linux $releasever - $basearch - Source
baseurl=http://172.25.60.250/rhel6/HighAvailability
gpgcheck=0
[LoadBalancer]
name=Red Hat Enterprise Linux $releasever - $basearch - Source
baseurl=http://172.25.60.250/rhel6/LoadBalancer
gpgcheck=0
[ResilientStorage]
name=Red Hat Enterprise Linux $releasever - $basearch - Source
baseurl=http://172.25.60.250/rhel6/ResilientStorage
gpgcheck=0
[ScalableFileSystem]
name=Red Hat Enterprise Linux $releasever - $basearch - Source
baseurl=http://172.25.60.250/rhel6/ScalableFileSystem
gpgcheck=0
实验主机：server6 server7 server8 网段：172.25.60.0
访问 https://server8.example.com:8084
帐号：root密码：123456
FENCE机制
在真机上安装 fence-virt-multicast
fence-virt-libvirt
fence-virt
dd if=/dev/urandom of=/etc/cluster/fence_xvm.key bs=128 count=1
systemctl start fence_virtd
fence_virtd -c进入执行界面，按照以下【】中内容填写
Module search path [/usr/lib64/fence-virt]:
Available backends:
libvirt 0.1
Available listeners:
multicast 1.2
Listener modules are responsible for accepting requests
from fencing clients.
Listener module [multicast]:
The multicast listener module is designed for use environments
where the guests and hosts may communicate over a network using
multicast.
The multicast address is the address that a client will use to
send fencing requests to fence_virtd.
Multicast IP Address [225.0.0.12]:
Using ipv4 as family.
Multicast IP Port [1229]:
Setting a preferred interface causes fence_virtd to listen only
on that interface. Normally, it listens on all interfaces.
In environments where the virtual machines are using the host
machine as a gateway, this *must* be set (typically to virbr0).
Set to ‘none‘ for no interface.
Interface [br0]:
The key file is the shared key information which is used to
authenticate fencing requests. The contents of this file must
be distributed to each physical host and virtual machine within
a cluster.
Key File [/etc/cluster/fence_xvm.key]:
Backend modules are responsible for routing requests to
the appropriate hypervisor or management layer.
Backend module [libvirt]:
Configuration complete.
=== Begin Configuration ===
backends {
libvirt {
uri = "qemu:///system";
}
}
listeners {
multicast {
port = "1229";
family = "ipv4";
interface = "br0";
address = "225.0.0.12";
key_file = "/etc/cluster/fence_xvm.key";
}
}
fence_virtd {
module_path = "/usr/lib64/fence-virt";
backend = "libvirt";
listener = "multicast";
}
=== End Configuration ===
上述配置文件会被写入到/etc/fence_virt.conf中
scpfence_xvm.key root@172.25.60.6 7 :/etc/cluster
进入网页管理界面：
添加完成后点击Nodes--->Add Fence Method（name默认即可）--->Add Fence Instance
在Domain 中填写物理主机中的虚拟机名称或者填写UUID--->提交完成
测试：
在server6上查看状态 clustat
执行fence_node server7.example.com，观察7上的运行状态
此时server7被fence掉执行重启，重启成功后自动加入节点中
整合httpd
添加虚拟ip和脚本文件
添加服务组
Add Resource时注意启动顺序 1.Ip Address 2.httpd
测试：关闭server6和server7上的httpd服务
clusvcadm -e apache开启apache服务组
查看server6的httpd服务和ip地址
clusvcadm -r apache -m server7.example.com将服务转换到server7上
查看server7的httpd服务和ip地址
在server8上添加一块空白硬盘做iscsi挂载
相关配置文件：/etc/tgt/targets.conf
# Sample target with one LUN only. Defaults to allow access for all initiators:
<target iqn.2016-08.com.example:server.target1>
backing-store /dev/vda
initiator-address 172.25.60.6
initiator-address 172.25.60.7
</target>
启动tgtd服务
并在server6 7 上登陆
iscsiadm -m discovery -t st -p 172.25.60.8
iscsiadm -m node -l
fdisk -cu /dev/sdb----> pvcreate /dev/sdb1--->vgcreate clustervg /dev/sdb1--->lvcreate -L 2G -n data1 /dev/clustervg
添加Resource
添加服务组
Ipaddr--->httpd--->data1
重启服务：clusvcadm -d apache
clusvcadm -e apache
查看挂载
转换节点：clusvcadm -r apache -m server7.example.com
HA mysql 数据库高可用
安装mysql mysql-server 启动mysqld服务 cp -rp /var/lib/mysql* /var/www/html (此目录为刚才挂载的目录，并不是这是目录) chown mysql.mysql /var/www/html
clusvcadm -d apache 停掉之前服务
删除Resources 中httpd和data1并创立新的源(删除之前在服务组先删除)
在服务组里添加服务：
Ipaddr--->filesystem--->script
关闭6 7 的mysqld服务
clusvcadm -e apache 开启服务组 查看对应节点上的mysql是否启动成功
（由于cp -rp时将sock套接字也一起复制过去了导致mysql服务启动失败，删除该套借字即可）
附加:
gfs2 分布式集群锁管理器
ext4格式文件系统只能单点挂载，gfs2可多点同时写入
格式化
mkfs.gfs2 -p lock_dlm -t rhel(此为开始创建的集群名称):mygf2 -j 3 /dev/clustervg/data1
mount /dev/clustervg/data1 /mntchown mysql.mysql /mntcd /mnt
gfs2_tool sb /dev/clustervg/data1 all 查看GFS2块参数
gfs2_tool journals /dev/clustervg/data1查看日志文件
实现开机自挂载
blkid查询设备UUID
vim /etc/fstab
UUID=xxxxxxxxxxxxx/var/lib/mysqlgfs2_netdev0 0
gfs2 lv扩容
lvextend -L +2G /dev/clustervg/data1
gfs2_grow /dev/clustervg/data1
gfs2_jadd -j 3 /dev/clustervg/data1 增加三个日志文件（每个128M）
####关闭集群的顺序
停止服务---> leave---> remove---> 关闭节点上的服务(cman rgmanager clvmd等)
####iscsi的登出删除
iscsiadm -m node -u
iscsiadm -m node -o delete
标签：ha高可用集群
原文地址：http://12060541.blog.51cto.com/12050541/1853798
