本文只是介紹Linux RHCS最基本的一些維護命令,屬於DBA應該瞭解的層面。
1.檢視叢集狀態
2.叢集正常啟動
3.叢集正常關閉
4.檢視服務是否關閉開機啟動

1.檢視叢集狀態
clustat
cman_tool status
cman_tool nodes -a

下面是這些命令查詢的顯示結果示例:
1.1 clustat檢視叢集狀態(最常用)
在節點1檢視的,狀態中的Local就在節點1上顯示。
# clustat
Cluster Status for new_cluster @ Tue Sep 1 12:23:09 2015
Member Status: Quorate

Member Name                                ID Status
------ ----                                ---- ------
heartdb1                                        1 Online, Local, rgmanager
heartdb2                                        2 Online, rgmanager

Service Name                                Owner (Last)                                  State
------- ----                                ----- ------                                  -----
service:orares                              heartdb1                                      started

1.2 cman_tool status 檢視
# cman_tool status
Version: 6.2.0
Config Version: 18
Cluster Name: new_cluster
Cluster Id: 23732
Cluster Member: Yes
Cluster Generation: 432
Membership state: Cluster-Member
Nodes: 2
Expected votes: 1
Total votes: 2
Quorum: 1
Active subsystems: 8
Flags: 2node Dirty
Ports Bound: 0 177
Node name: heartdb1
Node ID: 1
Multicast addresses: 239.192.92.17
Node addresses: 192.168.1.1

1.3 cman_tool 檢視nodes資訊
# cman_tool nodes -a
Node Sts Inc Joined              Name
1 M    404 2015-08-03 17:52:20 heartdb1
      Addresses: 192.168.1.1
2 M    432 2015-09-01 14:32:27 heartdb2
      Addresses: 192.168.1.2

2.叢集正常啟動
先啟動cman,再啟動rgmanager.
service cman start
service rgmanager start

下面是叢集正常啟動過程示例:
注: 各節點先依次啟動cman再依次啟動rgmanager,注意啟動順序。
# service cman start
Starting cluster:
Loading modules... done
Mounting configfs... done
Starting ccsd... done
Starting cman... done
Starting daemons... done
Starting fencing... done
[確定]

# service rgmanager start
啟動 Cluster Service Manager:[確定]

3.叢集正常關閉
先關閉rgmanager,再關閉cman.
service rgmanager stop
service cman stop

下面是叢集正常關閉過程示例:
注: 各節點先依次關閉rgmanager,再依次關閉cman,注意關閉順序。
# service rgmanager stop
Shutting down Cluster Service Manager...
等待服務停止:[確定]
Cluster Service Manager is stopped.

# service cman stop
Stopping cluster:
Stopping fencing... done
Stopping cman... done
Stopping ccsd... done
Unmounting configfs... done
[確定]

4.檢視服務是否關閉開機啟動
chkconfig --list |grep cman
chkconfig --list |grep rgmanager

下面的檢視結果都是關閉的:
# chkconfig --list |grep cman
cman            0:關閉 1:關閉 2:關閉 3:關閉 4:關閉 5:關閉 6:關閉
# chkconfig --list |grep rgmanager
rgmanager      0:關閉 1:關閉 2:關閉 3:關閉 4:關閉 5:關閉 6:關閉

Linux RHCS 基礎維護命令

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