注：此博文在博文“RHCS套件實現高可用負載均衡集群（二）”的基礎上完成

實驗開始前設置實驗環境

target端配置——server3

[root@server3 ~]# yum install -y scsi-* [root@server3 ~]# vim /etc/tgt/targets.conf 38 <target iqn.2008-09.com.example:server.target1>39 backing-store /dev/vdb40 initiator-address 172.25.54.141 initiator-address 172.25.54.242 </target>[root@server3 ~]# /etc/init.d/tgtd start Starting SCSI target daemon: [ OK ] [root@server3 ~]# tgt-admin -s Target 1: iqn.2008-09.com.example:server.target1System information:Driver: iscsiState: readyI_T nexus information:LUN information:LUN: 0Type: controllerSCSI ID: IET 00010000SCSI SN: beaf10Size: 0 MB, Block size: 1Online: YesRemovable media: NoPrevent removal: NoReadonly: NoBacking store type: nullBacking store path: NoneBacking store flags: LUN: 1Type: diskSCSI ID: IET 00010001SCSI SN: beaf11Size: 21475 MB, Block size: 512Online: YesRemovable media: NoPrevent removal: NoReadonly: NoBacking store type: rdwrBacking store path: /dev/vdbBacking store flags: Account information:ACL information:172.25.54.1172.25.54.2 [root@server3 ~]#

initiator端配置——server1、server2

[root@server1 ~]# yum install -y iscsi-*
[root@server2 ~]# yum install -y iscsi-*

• server1

[root@server1 ~]# iscsiadm -m discovery -t st -p 172.25.54.3 ##發現 iSCSI 設備 Starting iscsid: [ OK ] 172.25.54.3:3260,1 iqn.2008-09.com.example:server.target1 [root@server1 ~]# iscsiadm -m node -l ##登錄并導入 iSCSI 設備 Logging in to [iface: default, target: iqn.2008-09.com.example:server.target1, portal: 172.25.54.3,3260] (multiple) Login to [iface: default, target: iqn.2008-09.com.example:server.target1, portal: 172.25.54.3,3260] successful. [root@server1 ~]# fdisk -l ##存在 /dev/sda Disk /dev/sda: 21.5 GB, 21474836480 bytes 64 heads, 32 sectors/track, 20480 cylinders Units = cylinders of 2048 * 512 = 1048576 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 [root@server1 ~]# /etc/init.d/clvmd status clvmd (pid 1264) is running... Clustered Volume Groups: (none) Active clustered Logical Volumes: (none) [root@server1 ~]# lvsLV VG Attr LSize Pool Origin Data% Move Log Cpy%Sync Convertlv_root VolGroup -wi-ao---- 18.54g lv_swap VolGroup -wi-ao---- 992.00m [root@server1 ~]#

• server2

[root@server2 ~]# iscsiadm -m discovery -t st -p 172.25.54.3 Starting iscsid: [ OK ] 172.25.54.3:3260,1 iqn.2008-09.com.example:server.target1 [root@server2 ~]# iscsiadm -m node -l Logging in to [iface: default, target: iqn.2008-09.com.example:server.target1, portal: 172.25.54.3,3260] (multiple) Login to [iface: default, target: iqn.2008-09.com.example:server.target1, portal: 172.25.54.3,3260] successful. [root@server2 ~]# cat /proc/partitions major minor #blocks name252 0 20971520 vda252 1 512000 vda1252 2 20458496 vda2253 0 19439616 dm-0253 1 1015808 dm-18 0 20971520 sda [root@server2 ~]#

LVM創建

##server1 [root@server1 ~]# pvcreate /dev/sda Physical volume "/dev/sda" successfully created [root@server1 ~]# pvsPV VG Fmt Attr PSize PFree /dev/sda clustervg lvm2 a-- 20.00g 16.00g/dev/vda2 VolGroup lvm2 a-- 19.51g 0 [root@server1 ~]###server2 [root@server2 ~]# pvs ##還未同步PV VG Fmt Attr PSize PFree/dev/vda2 VolGroup lvm2 a-- 19.51g 0 [root@server2 ~]# pvs ##已同步PV VG Fmt Attr PSize PFree /dev/sda lvm2 a-- 20.00g 20.00g/dev/vda2 VolGroup lvm2 a-- 19.51g 0 [root@server2 ~]# ##server1 [root@server1 ~]# vgcreate clustervg /dev/sda Clustered volume group "clustervg" successfully created [root@server1 ~]# vgsVG #PV #LV #SN Attr VSize VFree VolGroup 1 2 0 wz--n- 19.51g 0 clustervg 1 1 0 wz--nc 20.00g 16.00g [root@server1 ~]###server2 [root@server2 ~]# vgsVG #PV #LV #SN Attr VSize VFree VolGroup 1 2 0 wz--n- 19.51g 0 clustervg 1 0 0 wz--nc 20.00g 20.00g [root@server2 ~]# ##server1 [root@server1 ~]# lvcreate -L 4G -n demo clustervgLogical volume "demo" created [root@server1 ~]# lvsLV VG Attr LSize Pool Origin Data% Move Log Cpy%Sync Convertlv_root VolGroup -wi-ao---- 18.54g lv_swap VolGroup -wi-ao---- 992.00m demo clustervg -wi-a----- 4.00g [root@server1 ~]# ##server2 [root@server2 ~]# lvsLV VG Attr LSize Pool Origin Data% Move Log Cpy%Sync Convertlv_root VolGroup -wi-ao---- 18.54g lv_swap VolGroup -wi-ao---- 992.00m demo clustervg -wi-a----- 4.00g [root@server2 ~]# [root@server1 ~]# mkfs.ext4 /dev/clustervg/demo [root@server1 ~]# clusvcadm -d nginx ##關閉前面實驗的nginx Local machine disabling service:nginx...Success [root@server1 ~]#

Mysql 測試——掛載測試

[root@server1 ~]# yum install -y mysql-server [root@server2 ~]# yum install -y mysql-server[root@server1 ~]# ll -d /var/lib/mysql/ drwxr-xr-x 2 mysql mysql 4096 Aug 9 2013 /var/lib/mysql/ [root@server1 ~]# cd /var/lib/mysql/ [root@server1 mysql]# ls [root@server1 mysql]# ll -d . drwxr-xr-x 2 mysql mysql 4096 Aug 9 2013 . [root@server1 mysql]# cd [root@server1 ~]# mount /dev/clustervg/demo /var/lib/mysql/ [root@server1 ~]# df Filesystem 1K-blocks Used Available Use% Mounted on /dev/mapper/VolGroup-lv_root 19134332 1228212 16934140 7% / tmpfs 510188 25656 484532 6% /dev/shm /dev/vda1 495844 33466 436778 8% /boot /dev/mapper/clustervg-demo 4128448 139256 3779480 4% /var/lib/mysql [root@server1 ~]# ll -d /var/lib/mysql/ drwxr-xr-x 3 root root 4096 Aug 2 15:49 /var/lib/mysql/ [root@server1 ~]# chown mysql.mysql /var/lib/mysql/ [root@server1 ~]# ll -d /var/lib/mysql/ drwxr-xr-x 3 mysql mysql 4096 Aug 2 15:49 /var/lib/mysql/ [root@server1 ~]# df Filesystem 1K-blocks Used Available Use% Mounted on /dev/mapper/VolGroup-lv_root 19134332 1228212 16934140 7% / tmpfs 510188 25656 484532 6% /dev/shm /dev/vda1 495844 33466 436778 8% /boot /dev/mapper/clustervg-demo 4128448 139256 3779480 4% /var/lib/mysql [root@server1 ~]# /etc/init.d/mysqld start [root@server1 ~]# cd - /var/lib/mysql [root@server1 mysql]# ls ibdata1 ib_logfile0 ib_logfile1 lost+found mysql mysql.sock test [root@server1 mysql]# /etc/init.d/mysqld stop Stopping mysqld: [ OK ] [root@server1 mysql]# cd [root@server1 ~]# df Filesystem 1K-blocks Used Available Use% Mounted on /dev/mapper/VolGroup-lv_root 19134332 1228216 16934136 7% / tmpfs 510188 25656 484532 6% /dev/shm /dev/vda1 495844 33466 436778 8% /boot /dev/mapper/clustervg-demo 4128448 160724 3758012 5% /var/lib/mysql [root@server1 ~]# umount /var/lib/mysql/ [root@server1 ~]# [root@server2 ~]# mount /dev/clustervg/demo /var/lib/mysql/ [root@server2 ~]# ll -d /var/lib/mysql/ drwxr-xr-x 5 mysql mysql 4096 Aug 2 16:02 /var/lib/mysql/ [root@server2 ~]# cd /var/lib/mysql/ [root@server2 mysql]# ls ibdata1 ib_logfile0 ib_logfile1 lost+found mysql test [root@server2 mysql]# /etc/init.d/mysqld start Starting mysqld: [ OK ] [root@server2 mysql]# /etc/init.d/mysqld stop Stopping mysqld: [ OK ] [root@server2 mysql]# cd [root@server2 ~]# df Filesystem 1K-blocks Used Available Use% Mounted on /dev/mapper/VolGroup-lv_root 19134332 1148688 17013664 7% / tmpfs 510188 25656 484532 6% /dev/shm /dev/vda1 495844 33466 436778 8% /boot /dev/mapper/clustervg-demo 4128448 160724 3758012 5% /var/lib/mysql [root@server2 ~]# umount /var/lib/mysql/ [root@server2 ~]# df Filesystem 1K-blocks Used Available Use% Mounted on /dev/mapper/VolGroup-lv_root 19134332 1148688 17013664 7% / tmpfs 510188 25656 484532 6% /dev/shm /dev/vda1 495844 33466 436778 8% /boot [root@server2 ~]#

[root@server1 ~]# clustat Cluster Status for tutu @ Thu Aug 2 16:13:35 2018 Member Status: QuorateMember Name ID Status------ ---- ---- ------server1 1 Online, Local, rgmanagerserver2 2 Online, rgmanagerService Name Owner (Last) State ------- ---- ----- ------ ----- service:mysql server1 started [root@server1 ~]# df Filesystem 1K-blocks Used Available Use% Mounted on /dev/mapper/VolGroup-lv_root 19134332 1228232 16934120 7% / tmpfs 510188 25656 484532 6% /dev/shm /dev/vda1 495844 33466 436778 8% /boot /dev/mapper/clustervg-demo 4128448 160724 3758012 5% /var/lib/mysql [root@server1 ~]# mysql Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 2 Server version: 5.1.71 Source distributionCopyright (c) 2000, 2013, 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 | | #mysql50#lost+found | | mysql | | test | +---------------------+ 4 rows in set (0.00 sec)mysql> quit Bye [root@server1 ~]# cd /var/lib/mysql/ [root@server1 mysql]# ls ibdata1 ib_logfile0 ib_logfile1 lost+found mysql mysql.sock test [root@server1 mysql]# cd [root@server1 ~]#

[root@server1 ~]# clustat Cluster Status for tutu @ Thu Aug 2 16:30:18 2018 Member Status: QuorateMember Name ID Status------ ---- ---- ------server1 1 Online, Local, rgmanagerserver2 2 Online, rgmanagerService Name Owner (Last) State ------- ---- ----- ------ ----- service:mysql server1 stopping ##server1 正在停止 [root@server1 ~]# clustat Cluster Status for tutu @ Thu Aug 2 16:30:32 2018 Member Status: QuorateMember Name ID Status------ ---- ---- ------server1 1 Online, Local, rgmanagerserver2 2 Online, rgmanagerService Name Owner (Last) State ------- ---- ----- ------ ----- service:mysql server2 started ##server2 開始工作 [root@server1 ~]#

集群化文件系統

本地文件系統演示

[root@server2 ~]# clustat Cluster Status for tutu @ Thu Aug 2 17:08:17 2018 Member Status: QuorateMember Name ID Status------ ---- ---- ------server1 1 Online, rgmanagerserver2 2 Online, Local, rgmanagerService Name Owner (Last) State ------- ---- ----- ------ ----- service:mysql server2 started [root@server2 ~]# clusvcadm -d mysql Local machine disabling service:mysql...Success [root@server2 ~]# df Filesystem 1K-blocks Used Available Use% Mounted on /dev/mapper/VolGroup-lv_root 19134332 1148744 17013608 7% / tmpfs 510188 25656 484532 6% /dev/shm /dev/vda1 495844 33466 436778 8% /boot [root@server2 ~]#

[root@server1 ~]# df Filesystem 1K-blocks Used Available Use% Mounted on /dev/mapper/VolGroup-lv_root 19134332 1228292 16934060 7% / tmpfs 510188 25656 484532 6% /dev/shm /dev/vda1 495844 33466 436778 8% /boot [root@server1 ~]# lvsLV VG Attr LSize Pool Origin Data% Move Log Cpy%Sync Convertlv_root VolGroup -wi-ao---- 18.54g lv_swap VolGroup -wi-ao---- 992.00m demo clustervg -wi-a----- 4.00g [root@server1 ~]# mount /dev/clustervg/demo /var/lib/mysql/ [root@server1 ~]# df Filesystem 1K-blocks Used Available Use% Mounted on /dev/mapper/VolGroup-lv_root 19134332 1228292 16934060 7% / tmpfs 510188 25656 484532 6% /dev/shm /dev/vda1 495844 33466 436778 8% /boot /dev/mapper/clustervg-demo 4128448 160724 3758012 5% /var/lib/mysql [root@server1 ~]# vgsVG #PV #LV #SN Attr VSize VFree VolGroup 1 2 0 wz--n- 19.51g 0 clustervg 1 1 0 wz--nc 20.00g 16.00g [root@server1 ~]# [root@server2 ~]# vgsVG #PV #LV #SN Attr VSize VFree VolGroup 1 2 0 wz--n- 19.51g 0 clustervg 1 1 0 wz--nc 20.00g 16.00g [root@server2 ~]# [root@server1 ~]# lvextend -L +8G /dev/clustervg/demo ##邏輯卷拉伸Extending logical volume demo to 12.00 GiBLogical volume demo successfully resized [root@server1 ~]# vgsVG #PV #LV #SN Attr VSize VFreeVolGroup 1 2 0 wz--n- 19.51g 0 clustervg 1 1 0 wz--nc 20.00g 8.00g [root@server1 ~]#[root@server2 ~]# vgsVG #PV #LV #SN Attr VSize VFreeVolGroup 1 2 0 wz--n- 19.51g 0 clustervg 1 1 0 wz--nc 20.00g 8.00g [root@server2 ~]# [root@server2 ~]# lvsLV VG Attr LSize Pool Origin Data% Move Log Cpy%Sync Convertlv_root VolGroup -wi-ao---- 18.54g lv_swap VolGroup -wi-ao---- 992.00m demo clustervg -wi-a----- 12.00g [root@server2 ~]#[root@server1 ~]# lvsLV VG Attr LSize Pool Origin Data% Move Log Cpy%Sync Convertlv_root VolGroup -wi-ao---- 18.54g lv_swap VolGroup -wi-ao---- 992.00m demo clustervg -wi-ao---- 12.00g [root@server1 ~]# [root@server1 ~]# resize2fs /dev/clustervg/demo [root@server1 ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup-lv_root 19G 1.2G 17G 7% / tmpfs 499M 26M 474M 6% /dev/shm /dev/vda1 485M 33M 427M 8% /boot /dev/mapper/clustervg-demo 12G 159M 12G 2% /var/lib/mysql [root@server1 ~]#[root@server2 ~]# mount /dev/clustervg/demo /var/lib/mysql/ [root@server2 ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup-lv_root 19G 1.1G 17G 7% / tmpfs 499M 26M 474M 6% /dev/shm /dev/vda1 485M 33M 427M 8% /boot /dev/mapper/clustervg-demo 12G 159M 12G 2% /var/lib/mysql [root@server2 ~]# [root@server1 ~]# cd /var/lib/mysql/ [root@server1 mysql]# ls ibdata1 ib_logfile0 ib_logfile1 lost+found mysql test [root@server1 mysql]# cp /etc/passwd . [root@server1 mysql]# ls ibdata1 ib_logfile0 ib_logfile1 lost+found mysql passwd test [root@server1 mysql]#[root@server2 ~]# cd /var/lib/mysql/ [root@server2 mysql]# ls ##此時會有一個錯誤提示 ls: cannot access passwd: Input/output error ibdata1 ib_logfile0 ib_logfile1 lost+found mysql passwd test [root@server2 mysql]# cd [root@server2 ~]# umount /var/lib/mysql/ [root@server2 ~]# df Filesystem 1K-blocks Used Available Use% Mounted on /dev/mapper/VolGroup-lv_root 19134332 1148752 17013600 7% / tmpfs 510188 25656 484532 6% /dev/shm /dev/vda1 495844 33466 436778 8% /boot [root@server2 ~]#[root@server1 mysql]# cd [root@server1 ~]# umount /var/lib/mysql/ [root@server1 ~]# df Filesystem 1K-blocks Used Available Use% Mounted on /dev/mapper/VolGroup-lv_root 19134332 1228296 16934056 7% / tmpfs 510188 25656 484532 6% /dev/shm /dev/vda1 495844 33466 436778 8% /boot [root@server1 ~]#

---

這種方式一個文件修改后，在另一臺主機上看不到更改后的內容
因為所用的文件系統是ext4，這是一種本地的文件系統，所以更改后不能同時生效
真實的生產環境中是不能用這種方式實現磁盤共享的

---

解決方法：使用網路文件系統gfs2

使用這種文件系統，兩個initiator端要實現通信，實現通信的方法是將initiator主機加入到一個集群中
GFS2 作為 RedHat
集群文件系統采用分布式元數據和多日志方式(multiple journal),并且 RedHat 僅支持 GFS2
文件系統作為高可用性集群文件系統部署使用。因為性能問題,從 RedHat Enterprise Linux 6
開始,GFS2 不再被支持作為單節點文件系統使用。

集群化文件系統

##查看集群中的主機 [root@server1 ~]# clustat Cluster Status for tutu @ Thu Aug 2 17:30:23 2018 Member Status: QuorateMember Name ID Status------ ---- ---- ------server1 1 Online, Local, rgmanagerserver2 2 Online, rgmanagerService Name Owner (Last) State ------- ---- ----- ------ ----- service:mysql (server2) disabled [root@server1 ~]# mkfs.gfs2 -j 3 -p lock_dlm -t tutu:mygfs2 /dev/clustervg/demo ##格式化磁盤創建文件系統 ## -j 3 通常日志的存放文件個數是節點數+1 [root@server1 ~]# mount /dev/clustervg/demo /var/lib/mysql/ [root@server1 ~]# cd /var/lib/mysql/ [root@server1 mysql]# ll total 0 [root@server1 mysql]# ll -d drwxr-xr-x 2 root root 3864 Aug 2 17:40 . [root@server1 mysql]# [root@server2 ~]# mount /dev/clustervg/demo /var/lib/mysql/ [root@server2 ~]# ll -d /var/lib/mysql/ drwxr-xr-x 2 root root 3864 Aug 2 17:40 /var/lib/mysql/ [root@server2 ~]# [root@server1 mysql]# /etc/init.d/mysqld [root@server1 mysql]# ll -d drwxr-xr-x 4 mysql mysql 3864 Aug 2 17:44 . [root@server1 mysql]# ls ibdata1 ib_logfile0 ib_logfile1 mysql mysql.sock test [root@server1 mysql]#[root@server2 ~]# ll -d /var/lib/mysql/ drwxr-xr-x 4 mysql mysql 3864 Aug 2 17:44 /var/lib/mysql/ [root@server2 ~]# ls /var/lib/mysql/ ibdata1 ib_logfile0 ib_logfile1 mysql mysql.sock test [root@server2 ~]# [root@server2 ~]# gfs2_tool sb /dev/clustervg/demo all ##配置、調試文件系統或收集有關文件系統的信息mh_magic = 0x01161970mh_type = 1mh_format = 100sb_fs_format = 1801sb_multihost_format = 1900sb_bsize = 4096sb_bsize_shift = 12no_formal_ino = 2no_addr = 23no_formal_ino = 1no_addr = 22sb_lockproto = lock_dlmsb_locktable = tutu:mygfs2uuid = b81d11be-6c2d-2841-1980-30410272190f [root@server2 ~]# gfs2_tool journals /dev/clustervg/demo all journal2 - 128MB journal1 - 128MB journal0 - 128MB 3 journal(s) found. [root@server2 ~]# [root@server1 mysql]# /etc/init.d/mysqld stop Stopping mysqld: [ OK ] [root@server1 mysql]# cd [root@server1 ~]# ##開機自動掛載測試 [root@server1 ~]# vim /etc/fstab [root@server1 ~]# cat /etc/fstab | tail -n 1 /dev/clustervg/demo /var/lib/mysql gfs2 _netdev 0 0 [root@server1 ~]# df Filesystem 1K-blocks Used Available Use% Mounted on /dev/mapper/VolGroup-lv_root 19134332 1228304 16934048 7% / tmpfs 510188 31816 478372 7% /dev/shm /dev/vda1 495844 33466 436778 8% /boot /dev/mapper/clustervg-demo 12581504 286520 12294984 3% /var/lib/mysql [root@server1 ~]# umount /var/lib/mysql/ [root@server1 ~]# df Filesystem 1K-blocks Used Available Use% Mounted on /dev/mapper/VolGroup-lv_root 19134332 1228304 16934048 7% / tmpfs 510188 25656 484532 6% /dev/shm /dev/vda1 495844 33466 436778 8% /boot [root@server1 ~]# mount -a [root@server1 ~]# df Filesystem 1K-blocks Used Available Use% Mounted on /dev/mapper/VolGroup-lv_root 19134332 1228304 16934048 7% / tmpfs 510188 31816 478372 7% /dev/shm /dev/vda1 495844 33466 436778 8% /boot /dev/mapper/clustervg-demo 12581504 286520 12294984 3% /var/lib/mysql [root@server1 ~]#[root@server2 ~]# vim /etc/fstab [root@server2 ~]# cat /etc/fstab | tail -n 1 /dev/clustervg/demo /var/lib/mysql gfs2 _netdev 0 0 [root@server2 ~]# df Filesystem 1K-blocks Used Available Use% Mounted on /dev/mapper/VolGroup-lv_root 19134332 1148760 17013592 7% / tmpfs 510188 31816 478372 7% /dev/shm /dev/vda1 495844 33466 436778 8% /boot /dev/mapper/clustervg-demo 12581504 286520 12294984 3% /var/lib/mysql [root@server2 ~]# mount -a [root@server2 ~]# df Filesystem 1K-blocks Used Available Use% Mounted on /dev/mapper/VolGroup-lv_root 19134332 1148760 17013592 7% / tmpfs 510188 31816 478372 7% /dev/shm /dev/vda1 495844 33466 436778 8% /boot /dev/mapper/clustervg-demo 12581504 286520 12294984 3% /var/lib/mysql [root@server2 ~]# [root@server1 ~]# clustat Cluster Status for tutu @ Thu Aug 2 17:54:33 2018 Member Status: QuorateMember Name ID Status------ ---- ---- ------server1 1 Online, Local, rgmanagerserver2 2 Online, rgmanagerService Name Owner (Last) State ------- ---- ----- ------ ----- service:mysql (server2) disabled [root@server1 ~]# clusvcadm -e mysql ##本節點，即server1 啟用 mysql 服務 Local machine trying to enable service:mysql...Success service:mysql is now running on server1 [root@server1 ~]# mysql Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 2 Server version: 5.1.71 Source distributionCopyright (c) 2000, 2013, 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> quit Bye [root@server1 ~]# clusvcadm -r mysql -m server2 ## 切換節點進行 mysql 服務 Trying to relocate service:mysql to server2...Success service:mysql is now running on server2 [root@server1 ~]# clustat Cluster Status for tutu @ Thu Aug 2 18:06:07 2018 Member Status: QuorateMember Name ID Status------ ---- ---- ------server1 1 Online, Local, rgmanagerserver2 2 Online, rgmanagerService Name Owner (Last) State ------- ---- ----- ------ ----- service:mysql server2 started [root@server1 ~]#[root@server2 ~]# mysql Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 2 Server version: 5.1.71 Source distributionCopyright (c) 2000, 2013, 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> quit Bye [root@server2 ~]#

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