RHEL6+GFS2+MYSQL高可用

RHCS集群安装部署

组件介绍:

luci: luci是一个基于web的，用来管理和配置RHCS集群，通过luci可以轻松的搭建一个功能强大的集群系统，节点主机可以使用ricci来和luci 管理段进行通信

ricci: 安装在集群的节点的接收来自 luci 管理请求的代理，端口=11111

rgmanager: 高可用性服务管理，主要用来监督、启动和停止集群的应用、服务和资源

cman: 全称clustermanagment，cman用于管理集群成员、消息和通知。他通过监控每个节点的运行状态来了解节点成员之间的关系，当节点出现故障时，cman及时将这种改变通知底层，进而做出相应的调整

gfs2: 集群文件系统，GFS是RHCS为集群系统提供的一个存储解决方案，它允许集群多个节点在块级别上共享存储，每个节点通过共享一个存储空间，保证了访问数据的一致性，更切实的说，GFS是RHCS提供的一个集群文件系统，多个节点同时挂载一个文件系统分区，而文件系统数据不受破坏，这是单一的文件系统不能实现的。

iscsi-target-utils: iscsi服务端

iscsi-initiator: iscsi发起端

主机名	IP	software
csnode01	192.168.2.10	luci,ricci,rgmanager,cman,mysql-server,gfs2-utils,iscsi-initiator-utils
csnode02	192.168.2.20	ricci,rgmanager,cman,mysql-server,gfs2-utils,iscsi-initiator-utils
csnode03	192.168.2.30	ricci,rgmanager,cman,mysql-server,gfs2-utils,iscsi-initiator-utils
csnode04	192.168.2.40	scsi-target-utils

 

基础服务配置：

在csnode04上：

配置yum仓库，通过httpd实现：

挂载OS镜像

启动httpd服务：

#service httpd start

#chkconfig httpd on

#cd /var/www/html

[root@csnode04 html]# mkdir rhel/6/os/x86_64/ -pv

[root@csnode04 html]# mount /dev/sr0 rhel/6/os/x86_64/

mount: block device /dev/sr0 is write-protected, mounting read-only

在csnode01,cdnode02,cdnode03上配置以下：

#vim /etc/yum.repo.d/base.repo

[rhel-source]

name=Red Hat Enterprise Linux $releasever - $basearch - Source

baseurl=http://192.168.2.40/rhel/6/os/x86_64/

enabled=1

gpgcheck=0

[HighAvailability]

name=Red Hat Enterprise Linux $releasever - $basearch - Source

baseurl=http://192.168.2.40/rhel/6/os/x86_64/HighAvailability

enabled=1

gpgcheck=0

[LoadBalancer]

name=Red Hat Enterprise Linux $releasever - $basearch - Source

baseurl=http://192.168.2.40/rhel/6/os/x86_64/LoadBalancer

enabled=1

gpgcheck=0

[ResilientStorage]

name=Red Hat Enterprise Linux $releasever - $basearch - Source

baseurl=http://192.168.2.40/rhel/6/os/x86_64/ResilientStorage

enabled=1

gpgcheck=0

[ScalableFileSystem]

name=Red Hat Enterprise Linux $releasever - $basearch - Source

baseurl=http://192.168.2.40/rhel/6/os/x86_64/ScalableFileSystem

enabled=1

gpgcheck=0

4台服务器配置hosts名称解析：

#vim /etc/hosts

127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4

::1         localhost localhost.localdomain localhost6 localhost6.localdomain6

192.168.2.10 csnode01.example.com csnode01

192.168.2.20 csnode02.example.com csnode02

192.168.2.30 csnode03.example.com csnode03

192.168.2.40 csnode04.example.com csnode04

禁用防火墙：

#service iptables stop

#chkconfig iptables off

关闭网络服务：

#service NetworkManager stop

#chkconfig NetworkManager off

关闭Selinux:

#sed -i 's/^SELINUX=.*/SELINUX=disabled/g' /etc/selinux/config

安装RHCS工具：

管理服务器csnode01安装luci:

[root@csnode01 yum.repos.d]# yum install luci -y

[root@csnode01 yum.repos.d]# service luci start

[root@csnode01 yum.repos.d]# chkconfig luci on

浏览器访问 https://192.168.2.10:8084 使用root帐号密码即可登陆管理界面:

集群节点csnode01,csnode02,csnode03安装ricci rgmanager cman

[root@csnode01 yum.repos.d]#yum install ricci rgmanager cman -y

从红帽企业版 Linux 6.1 开始,您在任意节点中使用 ricci 推广更新的集群配置时要求输入密码。所以在前面两台主机安装完成ricci后需要修改ricci用户的密码，这个是后面节点设置的密码，并且要作时间同步；然后启动安装的服务

修改密码：

[root@csnode01 yum.repos.d]# echo 123456 | passwd --stdin ricci

永久启动服务：

[root@csnode01 yum.repos.d]# service ricci start;service rgmanager start ;service cman start

[root@csnode01 yum.repos.d]# chkconfig ricci on ; chkconfig rgmanager on ; chkconfig cman on

安装好RHCS，在启动cman的时候会提示如下错误：

Starting cman... xmlconfig cannot find/etc/cluster/cluster.conf    [Failed]

是由于cluster.conf文件没有创建，可以安装luci图形界面配置。

访问图形管理界面，配置RHCS：

登入：https://192.168.2.10:8084

配置Cluster:

Manag Clusters -> Create (其中password填写　123456　用户的密码，同时建议将”Reboot Nodes Before Joining Cluster“推荐勾选上)

添加故障转移域：FailOverDomains -> Add ，添加转移域

说明：

Prioritized:故障转移时选择优先级高

Restricted:服务只运行在指定的节点上

No Failback:故障节点恢复后，服务不用切换回去

服务安装

给csnode04添加一块硬盘,将/dev/sdb(新添加的硬盘)共享给csnode01、csnode02和csnode03

安装服务端程序：

[root@csnode04 yum.repos.d]# yum install scsi-target-utils -y

创建分区：

[root@csnode04 yum.repos.d]# fdisk /dev/sdb

Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel

Building a new DOS disklabel with disk identifier 0xe747f71d.

Changes will remain in memory only, until you decide to write them.

After that, of course, the previous content won't be recoverable.

Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)

WARNING: DOS-compatible mode is deprecated. It's strongly recommended to

switch off the mode (command 'c') and change display units to

sectors (command 'u').

Command (m for help): n

Command action

e   extended

p   primary partition (1-4)

p

Partition number (1-4): 1

First cylinder (1-20480, default 1):

Using default value 1

Last cylinder, +cylinders or +size{K,M,G} (1-20480, default 20480):

Using default value 20480

Command (m for help): w

The partition table has been altered!

Calling ioctl() to re-read partition table.

Syncing disks.

让内核重读分区表：

[root@csnode04 yum.repos.d]# partx -a /dev/sdb

BLKPG: Device or resource busy

error adding partition 1

[root@csnode04 yum.repos.d]# partx -a /dev/sdb

BLKPG: Device or resource busy

error adding partition 1

在csnode04上配置服务端，添加配置文件：

[root@csnode04 yum.repos.d]# vim /etc/tgt/targets.conf

<target iqn.2019-11.com.example:server.target1>

backing-store /dev/sdb1

initiator-address 192.168.2.10

initiator-address 192.168.2.20

initiator-address 192.168.2.30

</target>

启动tgtd服务，并开机自启：

[root@csnode04 yum.repos.d]# service tgtd start

[root@csnode04 yum.repos.d]# chkconfig tgtd on

查看共享的设备信息：

[root@csnode04 yum.repos.d]# tgtadm -L iscsi -m target -o show

Target 1: iqn.2019-11.com.example:server.target1

System information:

Driver: iscsi

State: ready

I_T nexus information:

LUN information:

LUN: 0

Type: controller

SCSI ID: IET     00010000

SCSI SN: beaf10

Size: 0 MB, Block size: 1

Online: Yes

Removable media: No

Prevent removal: No

Readonly: No

Backing store type: null

Backing store path: None

Backing store flags:

LUN: 1

Type: disk

SCSI ID: IET     00010001

SCSI SN: beaf11

Size: 21475 MB, Block size: 512

Online: Yes

Removable media: No

Prevent removal: No

Readonly: No

Backing store type: rdwr

Backing store path: /dev/sdb1

Backing store flags:

Account information:

ACL information:

192.168.2.10

192.168.2.20

192.168.2.30

csnode01、csnode02和csnode03安装客户端程序：

[root@csnode01 yum.repos.d]# yum install iscsi-initiator-utils –y

启动服务，并永久启动：

[root@csnode01 yum.repos.d]# service iscsi start;service iscsid start

[root@csnode01 yum.repos.d]# chkconfig iscsi on;chkconfig iscsid on

csnode01、csnode02和csnode03发现共享设备：

[root@csnode01 yum.repos.d]# iscsiadm -m discovery -t st -p 192.168.2.40

Starting iscsid:                                           [  OK  ]

192.168.2.40:3260,1 iqn.2019-11.com.example:server.target1

csnode01、csnode02和csnode03登入存储设备：

[root@csnode01 yum.repos.d]# iscsiadm -m node -T iqn.2019-11.com.example:server.target1 -p 192.168.2.40 -l

Logging in to [iface: default, target: iqn.2019-11.com.example:server.target1, portal: 192.168.2.40,3260] (multiple)

Login to [iface: default, target: iqn.2019-11.com.example:server.target1, portal: 192.168.2.40,3260] successful.

此时使用fdisk -l可以看到/dev/sdb设备

csnode01、csnode02和csnode03安装集群文件系统程序：

[root@csnode01 yum.repos.d]# yum install gfs2-utils –y

创建分区：

[root@csnode01 ~]# fdisk /dev/sdb

Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel

Building a new DOS disklabel with disk identifier 0x20e43e5e.

Changes will remain in memory only, until you decide to write them.

After that, of course, the previous content won't be recoverable.

Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)

WARNING: DOS-compatible mode is deprecated. It's strongly recommended to

switch off the mode (command 'c') and change display units to

sectors (command 'u').

Command (m for help): n

Command action

e   extended

p   primary partition (1-4)

p

Partition number (1-4): 1

First cylinder (1-20479, default 1):

Using default value 1

Last cylinder, +cylinders or +size{K,M,G} (1-20479, default 20479):

Using default value 20479

Command (m for help): w

The partition table has been altered!

Calling ioctl() to re-read partition table.

Syncing disks.

任意节点格式化集群文件系统,这里选择csnode01：

[root@csnode01 ~]# mkfs.gfs2 -j 3 -p lock_dlm -t csCluster:sdb1 /dev/sdb1

This will destroy any data on /dev/sdb1.

It appears to contain: data

Are you sure you want to proceed? [y/n] y

Device:                    /dev/sdb1

Blocksize:                 4096

Device Size                20.00 GB (5242620 blocks)

Filesystem Size:           20.00 GB (5242617 blocks)

Journals:                  3

Resource Groups:           80

Locking Protocol:          "lock_dlm"

Lock Table:                "csCluster:sdb1"

UUID:                      4b12a97a-c23c-998a-9ac3-8a579deb5391

csnode01、csnode02和csnode03安装mysql-server服务：

[root@csnode01 ~]# yum install mysql-server –y

挂载刚才的gfs2文件系统给mysql：

[root@csnode01 ~]# mount -t gfs2 /dev/sdb1 /var/lib/mysql/

测试：

csnode01创建一个目录haha:

[root@csnode01 ~]# cd /var/lib/mysql/

[root@csnode01 mysql]# mkdir haha

[root@csnode01 mysql]# ls

haha

csnode02挂载设备:

[root@csnode02 ~]# mount -t gfs2 /dev/sdb1 /var/lib/mysql/

invalid device path "/dev/sdb1"

发现有问题：应让内核重读分区表：

[root@csnode02 ~]# partx -a /dev/sdb

[root@csnode02 ~]# mount -t gfs2 /dev/sdb1 /var/lib/mysql/

[root@csnode02 ~]# cd /var/lib/mysql/

[root@csnode02 mysql]# ls

haha

在csnode02上也看到了刚才看到的haha目录

在csnode01上删除haha，在csnode02上看不到haha目录，实现同步操作。

此时gfs2配置完成,卸载csnode02上的/var/lib/mysql，在luci界面上配置gfs2资源，使其自动开启服务，并实现数据共享：

[root@csnode02 ~]# umount /var/lib/mysql/

配置资源，添加至资源组

其实就是将资源添加之后，新建资源组，谁拿到资源组谁就可以挂载共享磁盘，打开服务，获得数据库中数据。

新建资源组，按照IP，文件管理器，服务的顺序加入资源组中：

添加资源组：

添加IP资源配置信息：

添加GFS配置信息：

加入资源组，确认之后，重新刷新luci页面，查看效果。配置完成如下：

登入csnode01,发现/dev/sdb1自动挂载到了csnode01,mysql服务自动开启：

[root@csnode01 ~]# cd /var/lib/mysql/

[root@csnode01 mysql]# ls

ibdata1  ib_logfile0  ib_logfile1  mysql  mysql.sock  test

查询集群状态信息：

[root@csnode01 mysql]# clustat

Cluster Status for csCluster @ Sun Dec  1 14:47:05 2019

Member Status: Quorate

Member Name                                                  ID   Status

------ ----                                                  ---- ------

csnode01.example.com                                             1 Online, Local, rgmanager

csnode02.example.com                                             2 Online, rgmanager

csnode03.example.com                                             3 Online, rgmanager

Service Name                                        Owner (Last)                                        State

------- ----                                        ----- ------                                        -----

service:mysqlha                                     csnode01.example.com

切换到csnode02上：

 

在csnode01上查看集群服务，发现服务已切换到csnode02节点：

[root@csnode01 ~]# clustat

Cluster Status for csCluster @ Sun Dec  1 14:49:49 2019

Member Status: Quorate

Member Name                                                  ID   Status

------ ----                                                  ---- ------

csnode01.example.com                                             1 Online, Local, rgmanager

csnode02.example.com                                             2 Online, rgmanager

csnode03.example.com                                             3 Online, rgmanager

Service Name                                        Owner (Last)                                        State

------- ----                                        ----- ------                                        -----

service:mysqlha                                     csnode02.example.com                                starting

 查看csnode02上磁盘挂载信息：

[root@csnode02 ~]# df

Filesystem           1K-blocks      Used Available Use% Mounted on

/dev/mapper/system-lv_root

36950724   2882816  32190916   9% /

tmpfs                  1962828     31884   1930944   2% /dev/shm

/dev/sda1               198337     32970    155127  18% /boot

/dev/sdb1             20967856    418908  20548948   2% /var/lib/mysql

测试登入mysql,执行相关命令:

[root@csnode02 ~]# mysql

Welcome to the MySQL monitor.  Commands end with ; or \g.

Your MySQL connection id is 2

Server version: 5.1.66 Source distribution

Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its

affiliates. Other names may be trademarks of their respective

owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> show databases;

+--------------------+

| Database           |

+--------------------+

| information_schema |

| mysql              |

| test               |

+--------------------+

3 rows in set (0.00 sec)

mysql> create databases test1;

mysql> create database test1;

Query OK, 1 row affected (0.01 sec)

重启csnode02，发现服务重新启动在csnode01上：

止此，rhcs+gfs2+mysql搭建完成。