1、pacemaker 是什麼
2、pacemaker 特色
3、pacemaker 軟件包供應商
4、pacemaker 版本信息
5、pacemaker 配置案例
6、pacemaker 支持集羣架構
7、pacemaker 內部結構
8、pacemaker 源代碼組成
9、Centos6.4+Corosync+Pacemaker 實現高可用的Web集羣php
Linux 高可用(HA)集羣基本概念詳解 http://www.linuxidc.com/Linux/2013-08/88522.htmhtml
Linux 高可用(HA)集羣之Heartbeat詳解 http://www.linuxidc.com/Linux/2013-08/88521.htmnode
Corosync+Pacemaker+DRBD+MySQL 實現高可用(HA)的MySQL集羣 http://www.linuxidc.com/Linux/2013-08/89036.htmpython
1、pacemaker 是什麼
1.pacemaker 簡單說明
pacemaker(直譯:心臟起搏器),是一個羣集資源管理器。它實現較大可用性羣集服務(亦稱資源管理)的節點和資源級故障檢測和恢復使用您的推薦集羣基礎設施(OpenAIS的或Heaerbeat)提供的消息和成員能力。
它能夠作乎任何規模的集羣,並配備了一個強大的依賴模型,使管理員可以準確地表達羣集資源之間的關係(包括順序和位置)。幾乎任何能夠編寫腳本,能夠管理做爲心臟起搏器集羣的一部分。
我再次說明一下,pacemaker是個資源管理器,不是提供心跳信息的,由於它彷佛是一個廣泛的誤解,也是值得的。pacemaker是一個延續的CRM(亦稱Heartbeat V2資源管理器),最初是爲心跳,但已經成爲獨立的項目。
2.pacemaker 由來
你們都知道,Heartbeat 到了V3版本後,拆分爲多個項目,其中pacemaker就是拆分出來的資源管理器。mysql
Heartbeat 3.0拆分以後的組成部分:linux
Heartbeat:將原來的消息通訊層獨立爲heartbeat項目,新的heartbeat只負責維護集羣各節點的信息以及它們以前通訊;nginx
Cluster Glue:至關於一箇中間層,它用來將heartbeat和pacemaker關聯起來,主要包含2個部分,即爲LRM和STONITH。web
Resource Agent:用來控制服務啓停,監控服務狀態的腳本集合,這些腳本將被LRM調用從而實現各類資源啓動、中止、監控等等。sql
Pacemaker : 也就是Cluster Resource Manager (簡稱CRM),用來管理整個HA的控制中心,客戶端經過pacemaker來配置管理監控整個集羣。
shell
2、pacemaker 特色
主機和應用程序級別的故障檢測和恢復
幾乎支持任何冗餘配置
同時支持多種集羣配置模式
配置策略處理法定人數損失(多臺機器失敗時)
支持應用啓動/關機順序
支持,必須/必須在同一臺機器上運行的應用程序
支持多種模式的應用程序(如主/從)
能夠測試任何故障或羣集的羣集狀態
注:說白了意思就是功能強大,如今最主流的資源管理器。
3、pacemaker 軟件包供應商
目前pacemaker支持主流的操做系統,
Fedora(12.0)
紅帽企業Linux(5.0,6.0)
openSUSE(11.0)
Debian
Ubuntu的LTS(10.4)
CentOS (5.0,6.0)
4、pacemaker 版本信息
目前,版的是pacemaker 1.1.10 ,是2013年7月發佈的
5、pacemaker 配置案例
1.主/從架構
說明:許多高可用性的狀況下,使用Pacemaker和DRBD的雙節點主/從集羣是一個符合成本效益的解決方案。
2.多節點備份集羣
說明:支持多少節點,Pacemaker能夠顯着下降硬件成本經過容許幾個主/從羣集要結合和共享一個公用備份節點。
3.共享存儲集羣
說明:有共享存儲時,每一個節點可能被用於故障轉移。Pacemaker甚至能夠運行多個服務。
4.站點集羣
說明:Pacemaker 1.2 將包括加強簡化設立分站點集羣
接下來請看第2頁精彩內容: http://www.linuxidc.com/Linux/2013-08/89037p2.htm
6、pacemaker 支持集羣
1.基於OpenAIS的集羣
2.傳統集羣架構,基於心跳信息
7、pacemaker 內部結構
1.羣集組件說明:
stonithd:心跳系統。
lrmd:本地資源管理守護進程。它提供了一個通用的接口支持的資源類型。直接調用資源代理(腳本)。
pengine:政策引擎。根據當前狀態和配置集羣計算的下一個狀態。產生一個過渡圖,包含行動和依賴關係的列表。
CIB:羣集信息庫。包含全部羣集選項,節點,資源,他們彼此之間的關係和現狀的定義。同步更新到全部羣集節點。
CRMD:集羣資源管理守護進程。主要是消息代理的PEngine和LRM,還選舉一個領導者(DC)統籌活動(包括啓動/中止資源)的集羣。
OpenAIS:OpenAIS的消息和成員層。
Heartbeat:心跳消息層,OpenAIS的一種替代。
CCM:共識羣集成員,心跳成員層。
2.功能概述
CIB使用XML表示集羣的集羣中的全部資源的配置和當前狀態。CIB的內容會被自動在整個集羣中同步,使用PEngine計算集羣的理想狀態,生成指令列表,而後輸送到DC(指定協調員)。Pacemaker 集羣中全部節點選舉的DC節點做爲主決策節點。若是當選DC節點宕機,它會在全部的節點上, 迅速創建一個新的DC。DC將PEngine生成的策略,傳遞給其餘節點上的LRMd(本地資源管理守護程序)或CRMD經過集羣消息傳遞基礎結構。當集羣中有節點宕機,PEngine從新計算的理想策略。在某些狀況下,可能有必要關閉節點,以保護共享數據或完整的資源回收。爲此,Pacemaker配備了stonithd設備。STONITH能夠將其它節點「爆頭」,一般是實現與遠程電源開關。Pacemaker會將STONITH設備,配置爲資源保存在CIB中,使他們能夠更容易地監測資源失敗或宕機。
8、pacemaker 源代碼組成
說明:你們能夠看到Pacemaker主要是由C語言寫的,其次是Python,說明其效率很是高。最後咱們來講一個小案例,實現高可用的Web集羣。
9、CentOS6.4+Corosync+Pacemaker 實現高可用的Web集羣
1.環境說明
(1).操做系統
CentOS 6.4 X86_64 位系統
(2).軟件環境
Corosync 1.4.1
Pacemaker 1.1.8
crmsh 1.2.6
(3).拓撲準備
2.Corosync與Pacemaker 安裝與配置
Corosync與Pacemaker安裝與配置我就不在這裏重複說明了,你們參考一下這篇博文:http://www.linuxidc.com/Linux/2013-08/88733.htm (Linux 高可用(HA)集羣之Corosync詳解)
3.Pacemaker 配置資源方法
(1).命令配置方式
crmsh
pcs
(2).圖形配置方式
pygui
hawk
LCMC
pcs
注:本文主要的講解的是crmsh
4.crmsh 簡單說明
注:如下上pacemaker 1.1.8的更新說明,最重要的我用紅色標記出來,從pacemaker 1.1.8開始,crm sh 發展成一個獨立項目,pacemaker中再也不提供,說明咱們安裝好pacemaker後,是不會有crm這個命令行模式的資源管理器的。
[root@node1 ~]# cd /usr/share/doc/pacemaker-1.1.8/
[root@node1 pacemaker-1.1.8]# ll
總用量 132
-rw-r--r-- 1 root root 1102 2月 22 13:05 AUTHORS
-rw-r--r-- 1 root root 109311 2月 22 13:05 ChangeLog
-rw-r--r-- 1 root root 18046 2月 22 13:05 COPYING
[root@node1 pacemaker-1.1.8]# vim ChangeLog
* Thu Sep 20 2012 Andrew Beekhof <andrew@beekhof.net> Pacemaker-1.1.8-1
- Update source tarball to revision: 1a5341f
- Statistics:
Changesets: 1019
Diff: 2107 files changed, 117258 insertions(+), 73606 deletions(-)
- All APIs have been cleaned up and reduced to essentials
- Pacemaker now includes a replacement lrmd that supports systemd and upstart agents
- Config and state files (cib.xml, PE inputs and core files) have moved to new locations
- The crm shell has become a separate project and no longer included with Pacemaker (crm shell 已成爲一個獨立的項目,pacemaker中一再提供)
- All daemons/tools now have a unified set of error codes based on errno.h (see crm_error)
[root@node1 ~]# crm
crmadmin crm_diff crm_failcount crm_mon crm_report crm_shadow crm_standby crm_verify
crm_attribute crm_error crm_master crm_node crm_resource crm_simulate crm_ticket
注:你們能夠看到,安裝好pacemaker後,就沒有crm shell命令行工具,咱們得單獨安裝。下面咱們就來講說怎麼安裝crm sh
5.安裝crmsh資源管理工具
(1).crmsh官方網站
https://savannah.nongnu.org/forum/forum.php?forum_id=7672
(2).crmsh下載地址
http://download.openSUSE.org/repositories/network:/ha-clustering:/Stable/
(3).安裝crmsh
[root@node1 ~]# rpm -ivh crmsh-1.2.6-0.rc2.2.1.x86_64.rpm
warning: crmsh-1.2.6-0.rc2.2.1.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID 7b709911: NOKEY
error: Failed dependencies:
pssh is needed by crmsh-1.2.6-0.rc2.2.1.x86_64
python-dateutil is needed by crmsh-1.2.6-0.rc2.2.1.x86_64
python-lxml is needed by crmsh-1.2.6-0.rc2.2.1.x86_64
注:你們能夠看到年缺乏依賴包,咱們先用yum安裝依賴包
[root@node1 ~]# yum install -y python-dateutil python-lxml
[root@node1 ~]# rpm -ivh crmsh-1.2.6-0.rc2.2.1.x86_64.rpm --nodeps
warning: crmsh-1.2.6-0.rc2.2.1.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID 7b709911: NOKEY
Preparing... ########################################### [100%]
1:crmsh ########################################### [100%]
[root@node1 ~]# crm #安裝好後出現一個crm命令,說明安裝完成
crm crm_attribute crm_error crm_master crm_node crm_resource crm_simulate crm_ticket
crmadmin crm_diff crm_failcount crm_mon crm_report crm_shadow crm_standby crm_verify
[root@node1 ~]# crm #輸入crm命令,進入資源配置模式
Cannot change active directory to /var/lib/pacemaker/cores/root: No such file or directory (2)
crm(live)# help #查看一下幫助
This is crm shell, a Pacemaker command line interface.
Available commands:
cib manage shadow CIBs
resource resources management
configure CRM cluster configuration
node nodes management
options user preferences
history CRM cluster history
site Geo-cluster support
ra resource agents information center
status show cluster status
help,? show help (help topics for list of topics)
end,cd,up go back one level
quit,bye,exit exit the program
crm(live)#
注:到此準備工做所有完成,下面咱們來具體配置一下高可用的Web集羣,在配置以前咱們還得簡的說明一下,crm sh 如何使用!
6.crmsh使用說明
注:簡單說明一下,其實遇到一個新命令較好的方法就是man一下!簡單的先熟悉一下這個命令,而後再慢慢嘗試。
[root@node1 ~]# crm #輸入crm命令,進入crm sh 模式
Cannot change active directory to /var/lib/pacemaker/cores/root: No such file or directory (2)
crm(live)# help #輸入help查看一下,會出下不少子命令
This is crm shell, a Pacemaker command line interface.
Available commands:
cib manage shadow CIBs
resource resources management
configure CRM cluster configuration
node nodes management
options user preferences
history CRM cluster history
site Geo-cluster support
ra resource agents information center
status show cluster status
help,? show help (help topics for list of topics)
end,cd,up go back one level
quit,bye,exit exit the program
crm(live)# configure #輸入configure就會進入,configure模式下,
crm(live)configure# #敲兩下tab鍵就會顯示configure下所有命令
? default-timeouts group node rename simulate
bye delete help op_defaults role template
cd edit history order rsc_defaults up
cib end load primitive rsc_template upgrade
cibstatus erase location property rsc_ticket user
clone exit master ptest rsctest verify
collocation fencing_topology modgroup quit save xml
colocation filter monitor ra schema
commit graph ms refresh show
crm(live)configure# help node #輸入help加你想了解的任意命令,就會顯示該命令的使用幫助與案例
The node command describes a cluster node. Nodes in the CIB are
commonly created automatically by the CRM. Hence, you should not
need to deal with nodes unless you also want to define node
attributes. Note that it is also possible to manage node
attributes at the `node` level.
Usage:
...............
node <uname>[:<type>]
[attributes <param>=<value> [<param>=<value>...]]
[utilization <param>=<value> [<param>=<value>...]]
type :: normal | member | ping
...............
Example:
...............
node node1
node big_node attributes memory=64
...............
注:好了,簡單說明就到這,其實就是一句話,不會的命令help一下。下面咱們開始配置,高可用的Web集羣。
7.crmsh 配置高可用的Web集羣
(1).查看一下默認配置
[root@node1 ~]# crm
Cannot change active directory to /var/lib/pacemaker/cores/root: No such file or directory (2)
crm(live)# configure
crm(live)configure# show
node node1.test.com
node node2.test.com
property $id="cib-bootstrap-options" \
dc-version="1.1.8-7.el6-394e906" \
cluster-infrastructure="classic openais (with plugin)" \
expected-quorum-votes="2" \
(2).檢測一下配置文件是否有錯
crm(live)# configure
crm(live)configure# verify
crm_verify[5202]: 2011/06/14_19:10:38 ERROR: unpack_resources: Resource start-up disabled since no STONITH resources have been defined
crm_verify[5202]: 2011/06/14_19:10:38 ERROR: unpack_resources: Either configure some or disable STONITH with the stonith-enabled option
crm_verify[5202]: 2011/06/14_19:10:38 ERROR: unpack_resources: NOTE: Clusters with shared data need STONITH to ensure data integrity
注:說咱們的STONITH resources沒有定義,因咱們這裏沒有STONITH設備,因此咱們先關閉這個屬性
crm(live)configure# property stonith-enabled=false
crm(live)configure# show
node node1.test.com
node node2.test.com
property $id="cib-bootstrap-options" \
dc-version="1.1.8-7.el6-394e906" \
cluster-infrastructure="classic openais (with plugin)" \
expected-quorum-votes="2" \
stonith-enabled="false"
crm(live)configure# verify #如今已經不報錯
(3).查看當前集羣系統所支持的類型
crm(live)# ra
crm(live)ra# classes
lsb
ocf / heartbeat pacemaker RedHat
service
stonith
(4).查看某種類別下的所用資源代理的列表
crm(live)ra# list lsb
auditd blk-availability corosync corosync-notifyd crond halt
htcacheclean httpd ip6tables iptables killall lvm2-lvmetad
lvm2-monitor messagebus netconsole netfs network nfs
nfslock ntpd ntpdate pacemaker postfix quota_nld
rdisc restorecond rpcbind rpcgssd rpcidmapd rpcsvcgssd
rsyslog sandbox saslauthd single sshd svnserve
udev-post winbind
crm(live)ra# list ocf heartbeat
AoEtarget AudibleAlarm CTDB ClusterMon Delay Dummy
EvmsSCC Evmsd Filesystem ICP IPaddr IPaddr2
IPsrcaddr IPv6addr LVM LinuxSCSI MailTo ManageRAID
ManageVE Pure-FTPd Raid1 Route SAPDatabase SAPInstance
SendArp ServeRAID SphinxSearchDaemon Squid Stateful SysInfo
VIPArip VirtualDomain WAS WAS6 WinPopup Xen
Xinetd anything apache conntrackd db2 drbd
eDir88 ethmonitor exportfs fio iSCSILogicalUnit iSCSITarget
ids iscsi jboss lxc mysql mysql-proxy
nfsserver nginx Oracle oralsnr pgsql pingd
portblock postfix proftpd rsyncd scsi2reservation sfex
symlink syslog-ng tomcat vmware
crm(live)ra# list ocf pacemaker
ClusterMon Dummy HealthCPU HealthSMART Stateful SysInfo SystemHealth controld
o2cb ping pingd
(5).查看某個資源代理的配置方法
crm(live)ra# info ocf:heartbeat:IPaddr
Manages virtual IPv4 addresses (portable version) (ocf:heartbeat:IPaddr)
This script manages IP alias IP addresses
It can add an IP alias, or remove one.
Parameters (* denotes required, [] the default):
ip* (string): IPv4 address
The IPv4 address to be configured in dotted quad notation, for example
"192.168.1.1".
nic (string, [eth0]): Network interface
The base network interface on which the IP address will be brought
online.
If left empty, the script will try and determine this from the
routing table.
Do NOT specify an alias interface in the form eth0:1 or anything here;
rather, specify the base interface only.
Prerequisite:
There must be at least one static IP address, which is not managed by
the cluster, assigned to the network interface.
If you can not assign any static IP address on the interface,
:
(6).接下來要建立的web集羣建立一個IP地址資源(IP資源是主資源,咱們查看一下怎麼定義一個主資源)
crm(live)# configure
crm(live)configure# primitive
usage: primitive <rsc> {[<class>:[<provider>:]]<type>|@<template>}
[params <param>=<value> [<param>=<value>...]]
[meta <attribute>=<value> [<attribute>=<value>...]]
[utilization <attribute>=<value> [<attribute>=<value>...]]
[operations id_spec
[op op_type [<attribute>=<value>...] ...]]
crm(live)configure# primitive vip ocf:heartbeat:IPaddr params ip=192.168.18.200 nic=eth0 cidr_netmask=24 #增長一個VIP資源
crm(live)configure# show #查看已增長好的VIP,我用紅色標記了一下
node node1.test.com
node node2.test.com
primitive vip ocf:heartbeat:IPaddr \
params ip="192.168.18.200" nic="eth0" cidr_netmask="24"
property $id="cib-bootstrap-options" \
dc-version="1.1.8-7.el6-394e906" \
cluster-infrastructure="classic openais (with plugin)" \
expected-quorum-votes="2" \
stonith-enabled="false"
crm(live)configure# verify #檢查一下配置文件有沒有錯誤
crm(live)configure# commit #提交配置的資源,在命令行配置資源時,只要不用commit提交配置好資源,就不會生效,一但用commit命令提交,就會寫入到cib.xml的配置文件中
crm(live)# status #查看一下配置好的資源狀態,有一個資源vip,運行在node1上
Last updated: Thu Aug 15 14:24:45 2013
Last change: Thu Aug 15 14:21:21 2013 via cibadmin on node1.test.com
Stack: classic openais (with plugin)
Current DC: node1.test.com - partition with quorum
Version: 1.1.8-7.el6-394e906
2 Nodes configured, 2 expected votes
1 Resources configured.
Online: [ node1.test.com node2.test.com ]
vip (ocf::heartbeat:IPaddr): Started node1.test.com
查看一下node1節點上的ip,你們能夠看到vip已經生效,然後咱們到node2上經過以下命令中止node1上的corosync服務,再查看狀態
[root@node1 ~]# ifconfig
eth0 Link encap:Ethernet HWaddr 00:0C:29:91:45:90
inet addr:192.168.18.201 Bcast:192.168.18.255 Mask:255.255.255.0
inet6 addr: fe80::20c:29ff:fe91:4590/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:375197 errors:0 dropped:0 overruns:0 frame:0
TX packets:291575 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:55551264 (52.9 MiB) TX bytes:52697225 (50.2 MiB)
eth0:0 Link encap:Ethernet HWaddr 00:0C:29:91:45:90
inet addr:192.168.18.200 Bcast:192.168.18.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:6473 errors:0 dropped:0 overruns:0 frame:0
TX packets:6473 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:875395 (854.8 KiB) TX bytes:875395 (854.8 KiB)
測試,中止node1節點上的corosync,能夠看到node1已經離線
[root@node2 ~]# ssh node1 "service corosync stop"
Signaling Corosync Cluster Engine (corosync) to terminate: [肯定]
Waiting for corosync services to unload:..[肯定]
[root@node2 ~]# crm status
Cannot change active directory to /var/lib/pacemaker/cores/root: No such file or directory (2)
Last updated: Thu Aug 15 14:29:04 2013
Last change: Thu Aug 15 14:21:21 2013 via cibadmin on node1.test.com
Stack: classic openais (with plugin)
Current DC: node2.test.com - partition WITHOUT quorum
Version: 1.1.8-7.el6-394e906
2 Nodes configured, 2 expected votes
1 Resources configured.
Online: [ node2.test.com ]
OFFLINE: [ node1.test.com ]
重點說明:上面的信息顯示node1.test.com已經離線,但資源vip卻沒能在node2.test.com上啓動。這是由於此時的集羣狀態爲"WITHOUT quorum"(紅色標記),即已經失去了quorum,此時集羣服務自己已經不知足正常運行的條件,這對於只有兩節點的集羣來說是不合理的。所以,咱們能夠經過以下的命令來修改忽略quorum不能知足的集羣狀態檢查:property no-quorum-policy=ignore
crm(live)# configure
crm(live)configure# property no-quorum-policy=ignore
crm(live)configure# show
node node1.test.com
node node2.test.com
primitive vip ocf:heartbeat:IPaddr \
params ip="192.168.18.200" nic="eth0" cidr_netmask="24"
property $id="cib-bootstrap-options" \
dc-version="1.1.8-7.el6-394e906" \
cluster-infrastructure="classic openais (with plugin)" \
expected-quorum-votes="2" \
stonith-enabled="false" \
no-quorum-policy="ignore"
crm(live)configure# verify
crm(live)configure# commit
片刻以後,集羣就會在目前仍在運行中的節點node2上啓動此資源了,以下所示:
[root@node2 ~]# crm status
Cannot change active directory to /var/lib/pacemaker/cores/root: No such file or directory (2)
Last updated: Thu Aug 15 14:38:23 2013
Last change: Thu Aug 15 14:37:08 2013 via cibadmin on node2.test.com
Stack: classic openais (with plugin)
Current DC: node2.test.com - partition WITHOUT quorum
Version: 1.1.8-7.el6-394e906
2 Nodes configured, 2 expected votes
1 Resources configured.
Online: [ node2.test.com ]
OFFLINE: [ node1.test.com ]
vip (ocf::heartbeat:IPaddr): Started node2.test.com
好了,驗正完成後,咱們正常啓動node1.test.com
[root@node2 ~]# ssh node1 "service corosync start"
Starting Corosync Cluster Engine (corosync): [肯定]
[root@node2 ~]# crm status
Cannot change active directory to /var/lib/pacemaker/cores/root: No such file or directory (2)
Last updated: Thu Aug 15 14:39:45 2013
Last change: Thu Aug 15 14:37:08 2013 via cibadmin on node2.test.com
Stack: classic openais (with plugin)
Current DC: node2.test.com - partition with quorum
Version: 1.1.8-7.el6-394e906
2 Nodes configured, 2 expected votes
1 Resources configured.
Online: [ node1.test.com node2.test.com ]
vip (ocf::heartbeat:IPaddr): Started node2.test.com
[root@node2 ~]#
正常啓動node1.test.com後,集羣資源vip極可能會從新從node2.test.com轉移回node1.test.com,但也可能不回去。資源的這種在節點間每一次的來回流動都會形成那段時間內其沒法正常被訪問,因此,咱們有時候須要在資源由於節點故障轉移到其它節點後,即使原來的節點恢復正常也禁止資源再次流轉回來。這能夠經過定義資源的黏性(stickiness)來實現。在建立資源時或在建立資源後,均可以指定指定資源黏性。好了,下面咱們來簡單回憶一下,資源黏性。
(7).資源黏性
資源黏性是指:資源更傾向於運行在哪一個節點。
資源黏性值範圍及其做用:
0:這是默認選項。資源放置在系統中的最適合位置。這意味着當負載能力「較好」或較差的節點變得可用時才轉移資源。此選項的做用基本等同於自動故障回覆,只是資源可能會轉移到非以前活動的節點上;
大於0:資源更願意留在當前位置,可是若是有更合適的節點可用時會移動。值越高表示資源越願意留在當前位置;
小於0:資源更願意移離當前位置。值越高表示資源越願意離開當前位置;
INFINITY:若是不是因節點不適合運行資源(節點關機、節點待機、達到migration-threshold 或配置更改)而強制資源轉移,資源老是留在當前位置。此選項的做用幾乎等同於徹底禁用自動故障回覆;
-INFINITY:資源老是移離當前位置;
咱們這裏能夠經過如下方式爲資源指定默認黏性值: rsc_defaults resource-stickiness=100
crm(live)configure# rsc_defaults resource-stickiness=100
crm(live)configure# verify
crm(live)configure# show
node node1.test.com
node node2.test.com
primitive vip ocf:heartbeat:IPaddr \
params ip="192.168.18.200" nic="eth0" cidr_netmask="24"
property $id="cib-bootstrap-options" \
dc-version="1.1.8-7.el6-394e906" \
cluster-infrastructure="classic openais (with plugin)" \
expected-quorum-votes="2" \
stonith-enabled="false" \
no-quorum-policy="ignore"
rsc_defaults $id="rsc-options" \
resource-stickiness="100"
crm(live)configure# commit
(8).結合上面已經配置好的IP地址資源,將此集羣配置成爲一個active/passive模型的web(httpd)服務集羣
Node1:
[root@node1 ~]# yum -y install httpd
[root@node1 ~]# echo "<h1>node1.magedu.com</h1>" > /var/www/html/index.html
Node2:
[root@node2 ~]# yum -y install httpd
[root@node2 ~]# echo "<h1>node2.magedu.com</h1>" > /var/www/html/index.html
測試一下:
node1:
node2:
然後在各節點手動啓動httpd服務,並確認其能夠正常提供服務。接着使用下面的命令中止httpd服務,並確保其不會自動啓動(在兩個節點各執行一遍):
node1:
[root@node1 ~]# /etc/init.d/httpd stop
[root@node1 ~]# chkconfig httpd off
node2:
[root@node2~]# /etc/init.d/httpd stop
[root@node2 ~]# chkconfig httpd off
接下來咱們將此httpd服務添加爲集羣資源。將httpd添加爲集羣資源有兩處資源代理可用:lsb和ocf:heartbeat,爲了簡單起見,咱們這裏使用lsb類型:
首先可使用以下命令查看lsb類型的httpd資源的語法格式:
crm(live)# ra
crm(live)ra# info lsb:httpd
start and stop Apache HTTP Server (lsb:httpd)
The Apache HTTP Server is an efficient and extensible \
server implementing the current HTTP standards.
Operations' defaults (advisory minimum):
start timeout=15
stop timeout=15
status timeout=15
restart timeout=15
force-reload timeout=15
monitor timeout=15 interval=15
接下來新建資源httpd:
crm(live)# configure
crm(live)configure# primitive httpd lsb:httpd
crm(live)configure# show
node node1.test.com
node node2.test.com
primitive httpd lsb:httpd
primitive vip ocf:heartbeat:IPaddr \
params ip="192.168.18.200" nic="eth0" cidr_netmask="24"
property $id="cib-bootstrap-options" \
dc-version="1.1.8-7.el6-394e906" \
cluster-infrastructure="classic openais (with plugin)" \
expected-quorum-votes="2" \
stonith-enabled="false" \
no-quorum-policy="ignore"
rsc_defaults $id="rsc-options" \
resource-stickiness="100"
crm(live)configure# verify
crm(live)configure# commit
來查看一下資源狀態
[root@node1 ~]# crm status
Cannot change active directory to /var/lib/pacemaker/cores/root: No such file or directory (2)
Last updated: Thu Aug 15 14:55:04 2013
Last change: Thu Aug 15 14:54:14 2013 via cibadmin on node1.test.com
Stack: classic openais (with plugin)
Current DC: node2.test.com - partition with quorum
Version: 1.1.8-7.el6-394e906
2 Nodes configured, 2 expected votes
2 Resources configured.
Online: [ node1.test.com node2.test.com ]
vip (ocf::heartbeat:IPaddr): Started node2.test.com
httpd (lsb:httpd): Started node1.test.com
從上面的信息中能夠看出vip和httpd有可能會分別運行於兩個節點上,這對於經過此IP提供Web服務的應用來講是不成立的,即此二者資源必須同時運行在某節點上。有兩種方法能夠解決,一種是定義組資源,將vip與httpd同時加入一個組中,能夠實現將資源運行在同節點上,另外一種是定義資源約束可實現將資源運行在同一節點上。咱們先來講每一種方法,定義組資源。
(9).定義組資源
crm(live)# configure
crm(live)configure# group webservice vip httpd
crm(live)configure# show
node node1.test.com
node node2.test.com
primitive httpd lsb:httpd
primitive vip ocf:heartbeat:IPaddr \
params ip="192.168.18.200" nic="eth0" cidr_netmask="24"
group webservice vip httpd
property $id="cib-bootstrap-options" \
dc-version="1.1.8-7.el6-394e906" \
cluster-infrastructure="classic openais (with plugin)" \
expected-quorum-votes="2" \
stonith-enabled="false" \
no-quorum-policy="ignore"
rsc_defaults $id="rsc-options" \
resource-stickiness="100"
crm(live)configure# verify
crm(live)configure# commit
再次查看一下資源狀態
[root@node1 ~]# crm status
Cannot change active directory to /var/lib/pacemaker/cores/root: No such file or directory (2)
Last updated: Thu Aug 15 15:33:09 2013
Last change: Thu Aug 15 15:32:28 2013 via cibadmin on node1.test.com
Stack: classic openais (with plugin)
Current DC: node2.test.com - partition with quorum
Version: 1.1.8-7.el6-394e906
2 Nodes configured, 2 expected votes
2 Resources configured.
Online: [ node1.test.com node2.test.com ]
Resource Group: webservice
vip (ocf::heartbeat:IPaddr): Started node2.test.com
httpd (lsb:httpd): Started node2.test.com
你們能夠看到,全部資源所有運行在node2上,下面咱們來測試一下
下面咱們模擬故障,測試一下
crm(live)# node
crm(live)node#
? cd end help online show status-attr
attribute clearstate exit list quit standby up
bye delete fence maintenance ready status utilization
crm(live)node# standby
[root@node1 ~]# crm status
Cannot change active directory to /var/lib/pacemaker/cores/root: No such file or directory (2)
Last updated: Thu Aug 15 15:39:05 2013
Last change: Thu Aug 15 15:38:57 2013 via crm_attribute on node2.test.com
Stack: classic openais (with plugin)
Current DC: node2.test.com - partition with quorum
Version: 1.1.8-7.el6-394e906
2 Nodes configured, 2 expected votes
2 Resources configured.
Node node2.test.com: standby
Online: [ node1.test.com ]
Resource Group: webservice
vip (ocf::heartbeat:IPaddr): Started node1.test.com
httpd (lsb:httpd): Started node1.test.com
[root@node1 ~]# ifconfig
eth0 Link encap:Ethernet HWaddr 00:0C:29:91:45:90
inet addr:192.168.18.201 Bcast:192.168.18.255 Mask:255.255.255.0
inet6 addr: fe80::20c:29ff:fe91:4590/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:408780 errors:0 dropped:0 overruns:0 frame:0
TX packets:323137 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:60432533 (57.6 MiB) TX bytes:57541647 (54.8 MiB)
eth0:0 Link encap:Ethernet HWaddr 00:0C:29:91:45:90
inet addr:192.168.18.200 Bcast:192.168.18.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:6525 errors:0 dropped:0 overruns:0 frame:0
TX packets:6525 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:882555 (861.8 KiB) TX bytes:882555 (861.8 KiB)
[root@node1 ~]# netstat -ntulp | grep :80
tcp 0 0 :::80 :::* LISTEN 16603/httpd
你們能夠看到時,當node2節點設置爲standby時,全部資源所有切換到node1上,下面咱們再來訪問一下Web頁面
好了,組資源的定義與說明,咱們就先演示到這,下面咱們來講一說怎麼定義資源約束。
(10).定義資源約束
咱們先讓node2上線,再刪除組資源
crm(live)node# online
[root@node1 ~]# crm_mon
Last updated: Thu Aug 15 15:48:38 2013
Last change: Thu Aug 15 15:46:21 2013 via crm_attribute on node2.test.com
Stack: classic openais (with plugin)
Current DC: node2.test.com - partition with quorum
Version: 1.1.8-7.el6-394e906
2 Nodes configured, 2 expected votes
2 Resources configured.
Online: [ node1.test.com node2.test.com ]
Resource Group: webservice
vip (ocf::heartbeat:IPaddr): Started node1.test.com
httpd (lsb:httpd): Started node1.test.com
刪除組資源操做
crm(live)# resource
crm(live)resource# show
Resource Group: webservice
vip (ocf::heartbeat:IPaddr): Started
httpd (lsb:httpd): Started
crm(live)resource# stop webservice #中止資源
crm(live)resource# show
Resource Group: webservice
vip (ocf::heartbeat:IPaddr): Stopped
httpd (lsb:httpd): Stopped
crm(live)resource# cleanup webservice #清理資源
Cleaning up vip on node1.test.com
Cleaning up vip on node2.test.com
Cleaning up httpd on node1.test.com
Cleaning up httpd on node2.test.com
Waiting for 1 replies from the CRMd. OK
crm(live)# configure
crm(live)configure# delete
cib-bootstrap-options node1.test.com rsc-options webservice
httpd node2.test.com vip
crm(live)configure# delete webservice #刪除組資源
crm(live)configure# show
node node1.test.com
node node2.test.com \
attributes standby="off"
primitive httpd lsb:httpd
primitive vip ocf:heartbeat:IPaddr \
params ip="192.168.18.200" nic="eth0" cidr_netmask="24"
property $id="cib-bootstrap-options" \
dc-version="1.1.8-7.el6-394e906" \
cluster-infrastructure="classic openais (with plugin)" \
expected-quorum-votes="2" \
stonith-enabled="false" \
no-quorum-policy="ignore" \
last-lrm-refresh="1376553277"
rsc_defaults $id="rsc-options" \
resource-stickiness="100"
crm(live)configure# commit
[root@node1 ~]# crm_mon
Last updated: Thu Aug 15 15:56:59 2013
Last change: Thu Aug 15 15:56:12 2013 via cibadmin on node1.test.com
Stack: classic openais (with plugin)
Current DC: node2.test.com - partition with quorum
Version: 1.1.8-7.el6-394e906
2 Nodes configured, 2 expected votes
2 Resources configured.
Online: [ node1.test.com node2.test.com ]
vip (ocf::heartbeat:IPaddr): Started node1.test.com
httpd (lsb:httpd): Started node2.test.com
你們能夠看到資源又從新運行在兩個節點上了,下面咱們來定義約束!使資源運行在同一節點上。首先咱們來回憶一下資源約束的相關知識,資源約束則用以指定在哪些羣集節點上運行資源,以何種順序裝載資源,以及特定資源依賴於哪些其它資源。pacemaker共給咱們提供了三種資源約束方法:
Resource Location(資源位置):定義資源能夠、不能夠或儘量在哪些節點上運行;
Resource Collocation(資源排列):排列約束用以定義集羣資源能夠或不能夠在某個節點上同時運行;
Resource Order(資源順序):順序約束定義集羣資源在節點上啓動的順序;
定義約束時,還須要指定分數。各類分數是集羣工做方式的重要組成部分。其實,從遷移資源到決定在已降級集羣中中止哪些資源的整個過程是經過以某種方式修改分數來實現的。分數按每一個資源來計算,資源分數爲負的任何節點都沒法運行該資源。在計算出資源分數後,集羣選擇分數較高的節點。INFINITY(無窮大)目前定義爲 1,000,000。加減無窮大遵循如下3個基本規則:
任何值 + 無窮大 = 無窮大
任何值 - 無窮大 = -無窮大
無窮大 - 無窮大 = -無窮大
定義資源約束時,也能夠指定每一個約束的分數。分數表示指派給此資源約束的值。分數較高的約束先應用,分數較低的約束後應用。經過使用不一樣的分數爲既定資源建立更多位置約束,能夠指定資源要故障轉移至的目標節點的順序
所以,對於前述的vip和httpd可能會運行於不一樣節點的問題,能夠經過如下命令來解決:
crm(live)configure# colocation httpd-with-ip INFUNTY: httpd vip
crm(live)configure# show
node node1.test.com
node node2.test.com \
attributes standby="off"
primitive httpd lsb:httpd
primitive vip ocf:heartbeat:IPaddr \
params ip="192.168.18.200" nic="eth0" cidr_netmask="24"
colocation httpd-with-ip INFUNTY: httpd vip
property $id="cib-bootstrap-options" \
dc-version="1.1.8-7.el6-394e906" \
cluster-infrastructure="classic openais (with plugin)" \
expected-quorum-votes="2" \
stonith-enabled="false" \
no-quorum-policy="ignore" \
last-lrm-refresh="1376553277"
rsc_defaults $id="rsc-options" \
resource-stickiness="100"
crm(live)configure# show xml
<rsc_colocation id="httpd-with-ip" score-attribute="INFUNTY" rsc="httpd" with-rsc="vip"/>
[root@node2 ~]# crm_mon
Last updated: Thu Aug 15 16:12:18 2013
Last change: Thu Aug 15 16:12:05 2013 via cibadmin on node1.test.com
Stack: classic openais (with plugin)
Current DC: node2.test.com - partition with quorum
Version: 1.1.8-7.el6-394e906
2 Nodes configured, 2 expected votes
2 Resources configured.
Online: [ node1.test.com node2.test.com ]
vip (ocf::heartbeat:IPaddr): Started node1.test.com
httpd (lsb:httpd): Started node1.test.com
你們能夠看到,全部資源所有運行在node1上,下面咱們來測試訪問一下
模擬一下故障,再進行測試
crm(live)# node
crm(live)node# standby
crm(live)node# show
node1.test.com: normal
standby: on
node2.test.com: normal
standby: off
[root@node2 ~]# crm_mon
Last updated: Thu Aug 15 16:14:33 2013
Last change: Thu Aug 15 16:14:23 2013 via crm_attribute on node1.test.com
Stack: classic openais (with plugin)
Current DC: node2.test.com - partition with quorum
Version: 1.1.8-7.el6-394e906
2 Nodes configured, 2 expected votes
2 Resources configured.
Node node1.test.com: standby
Online: [ node2.test.com ]
vip (ocf::heartbeat:IPaddr): Started node2.test.com
httpd (lsb:httpd): Started node2.test.com
你們能夠看到,資源所有移動到node2上了,再進行測試
接着,咱們還得確保httpd在某節點啓動以前得先啓動vip,這可使用以下命令實現:
crm(live)# configure
crm(live)configure# order httpd-after-vip mandatory: vip httpd
crm(live)configure# verify
crm(live)configure# show
node node1.test.com \
attributes standby="on"
node node2.test.com \
attributes standby="off"
primitive httpd lsb:httpd \
meta target-role="Started"
primitive vip ocf:heartbeat:IPaddr \
params ip="192.168.18.200" nic="eth0" cidr_netmask="24" \
meta target-role="Started"
colocation httpd-with-ip INFUNTY: httpd vip
order httpd-after-vip inf: vip httpd
property $id="cib-bootstrap-options" \
dc-version="1.1.8-7.el6-394e906" \
cluster-infrastructure="classic openais (with plugin)" \
expected-quorum-votes="2" \
stonith-enabled="false" \
no-quorum-policy="ignore" \
last-lrm-refresh="1376554276"
rsc_defaults $id="rsc-options" \
resource-stickiness="100"
crm(live)configure# show xml
<rsc_order id="httpd-after-vip" score="INFINITY" first="vip" then="httpd"/>
crm(live)configure# commit
此外,因爲HA集羣自己並不強制每一個節點的性能相同或相近。因此,某些時候咱們可能但願在正常時服務總能在某個性能較強的節點上運行,這能夠經過位置約束來實現:
crm(live)configure# location prefer-node1 vip node_pref::200: node1
好了,到這裏高可用的Web集羣的基本配置所有完成,下面咱們來說一下增長nfs資源。
8.crmsh 配置nfs資源
(1).配置NFS服務器
[root@nfs ~]# mkdir -pv /web
mkdir: 已建立目錄 「/web」
[root@nfs ~]# vim /etc/exports
/web/192.168.18.0/24(ro,async)
[root@nfs /]# echo '<h1>Cluster NFS Server</h1>' > /web/index.html
[root@nfs ~]# /etc/init.d/rpcbind start
啓動 rpcbind : [肯定]
[root@nfs /]# /etc/init.d/nfs start
啓動 NFS 服務: [肯定]
關掉 NFS 配額: [肯定]
啓動 NFS 守護進程: [肯定]
啓動 NFS mountd: [肯定]
[root@nfs /]# showmount -e 192.168.18.208
Export list for192.168.18.208:
/web192.168.18.0/24
(2).節點測試掛載
node1:
[root@node1 ~]# mount -t nfs 192.168.18.208:/web /mnt
[root@node1 ~]# cd /mnt/
[root@node1 mnt]# ll
總計 4
-rw-r--r-- 1 root root 28 08-07 17:41 index.html
[root@node1 mnt]# mount
/dev/sda2on / typeext3 (rw)
proc on /proctypeproc (rw)
sysfs on /systypesysfs (rw)
devpts on /dev/ptstypedevpts (rw,gid=5,mode=620)
/dev/sda3on /datatypeext3 (rw)
/dev/sda1on /boottypeext3 (rw)
tmpfs on /dev/shmtypetmpfs (rw)
none on /proc/sys/fs/binfmt_misctypebinfmt_misc (rw)
sunrpc on /var/lib/nfs/rpc_pipefstyperpc_pipefs (rw)
192.168.18.208:/webon /mnttypenfs (rw,addr=192.168.18.208)
[root@node1 ~]# umount /mnt
[root@node1 ~]# mount
/dev/sda2on / typeext3 (rw)
proc on /proctypeproc (rw)
sysfs on /systypesysfs (rw)
devpts on /dev/ptstypedevpts (rw,gid=5,mode=620)
/dev/sda3on /datatypeext3 (rw)
/dev/sda1on /boottypeext3 (rw)
tmpfs on /dev/shmtypetmpfs (rw)
none on /proc/sys/fs/binfmt_misctypebinfmt_misc (rw)
sunrpc on /var/lib/nfs/rpc_pipefstyperpc_pipefs (rw)
node2:
[root@node2 ~]# mount -t nfs 192.168.18.208:/web /mnt
[root@node2 ~]# cd /mnt
[root@node2 mnt]# ll
總計 4
-rw-r--r-- 1 root root 28 08-07 17:41 index.html
[root@node2 mnt]# mount
/dev/sda2on / typeext3 (rw)
proc on /proctypeproc (rw)
sysfs on /systypesysfs (rw)
devpts on /dev/ptstypedevpts (rw,gid=5,mode=620)
/dev/sda3on /datatypeext3 (rw)
/dev/sda1on /boottypeext3 (rw)
tmpfs on /dev/shmtypetmpfs (rw)
none on /proc/sys/fs/binfmt_misctypebinfmt_misc (rw)
sunrpc on /var/lib/nfs/rpc_pipefstyperpc_pipefs (rw)
192.168.18.208:/webon /mnttypenfs (rw,addr=192.168.18.208)
[root@node2 ~]# umount /mnt
[root@node2 ~]# mount
/dev/sda2on / typeext3 (rw)
proc on /proctypeproc (rw)
sysfs on /systypesysfs (rw)
devpts on /dev/ptstypedevpts (rw,gid=5,mode=620)
/dev/sda3on /datatypeext3 (rw)
/dev/sda1on /boottypeext3 (rw)
tmpfs on /dev/shmtypetmpfs (rw)
none on /proc/sys/fs/binfmt_misctypebinfmt_misc (rw)
sunrpc on /var/lib/nfs/rpc_pipefstyperpc_pipefs (rw)
(3).配置資源 vip 、httpd、nfs
crm(live)# configure
crm(live)configure# show
node node1.test.com
node node2.test.com
property $id="cib-bootstrap-options" \
dc-version="1.1.8-7.el6-394e906" \
cluster-infrastructure="classic openais (with plugin)" \
expected-quorum-votes="2" \
stonith-enabled="false" \
no-quorum-policy="ignore" \
last-lrm-refresh="1376555949"
rsc_defaults $id="rsc-options" \
resource-stickiness="100"
crm(live)configure# primitive vip ocf:heartbeat:IPaddr params ip=192.168.18.200 nic=eth0 cidr_netmask=24
crm(live)configure# primitive httpd lsb:httpd
crm(live)configure# primitive nfs ocf:heartbeat:Filesystem params device=192.168.18.208:/web directory=/var/www/html fstype=nfs
crm(live)configure# verify
WARNING: nfs: default timeout 20s for start is smaller than the advised 60
WARNING: nfs: default timeout 20s for stop is smaller than the advised 60
crm(live)configure# show
node node1.test.com
node node2.test.com
primitive httpd lsb:httpd
primitive nfs ocf:heartbeat:Filesystem \
params device="192.168.18.208:/web" directory="/var/www/html" fstype="nfs"
primitive vip ocf:heartbeat:IPaddr \
params ip="192.168.18.200" nic="eth0" cidr_netmask="24"
property $id="cib-bootstrap-options" \
dc-version="1.1.8-7.el6-394e906" \
cluster-infrastructure="classic openais (with plugin)" \
expected-quorum-votes="2" \
stonith-enabled="false" \
no-quorum-policy="ignore" \
last-lrm-refresh="1376555949"
rsc_defaults $id="rsc-options" \
resource-stickiness="100"
crm(live)configure# commit
WARNING: nfs: default timeout 20s for start is smaller than the advised 60
WARNING: nfs: default timeout 20s for stop is smaller than the advised 60
查看一下定義的三個資源,你們能夠看到三個資源不在同一個節點上,下面咱們定義一下組資源,來使三個資源在同一節點上。
[root@node2 ~]# crm_mon
Last updated: Thu Aug 15 17:00:17 2013
Last change: Thu Aug 15 16:58:44 2013 via cibadmin on node1.test.com
Stack: classic openais (with plugin)
Current DC: node2.test.com - partition with quorum
Version: 1.1.8-7.el6-394e906
2 Nodes configured, 2 expected votes
3 Resources configured.
Online: [ node1.test.com node2.test.com ]
vip (ocf::heartbeat:IPaddr): Started node1.test.com
httpd (lsb:httpd): Started node2.test.com
nfs (ocf::heartbeat:Filesystem): Started node1.test.com
(4).定義組資源
crm(live)# configure
crm(live)configure# group webservice vip nfs httpd
crm(live)configure# verify
crm(live)configure# show
node node1.test.com
node node2.test.com
primitive httpd lsb:httpd
primitive nfs ocf:heartbeat:Filesystem \
params device="192.168.18.208:/web" directory="/var/www/html" fstype="nfs"
primitive vip ocf:heartbeat:IPaddr \
params ip="192.168.18.200" nic="eth0" cidr_netmask="24"
group webservice vip nfs httpd
property $id="cib-bootstrap-options" \
dc-version="1.1.8-7.el6-394e906" \
cluster-infrastructure="classic openais (with plugin)" \
expected-quorum-votes="2" \
stonith-enabled="false" \
no-quorum-policy="ignore" \
last-lrm-refresh="1376555949"
rsc_defaults $id="rsc-options" \
resource-stickiness="100"
crm(live)configure# commit
查看一下資源狀態,全部資源所有在node1上,下面咱們測試一下
[root@node2 ~]# crm_mon
Last updated: Thu Aug 15 17:03:20 2013
Last change: Thu Aug 15 17:02:44 2013 via cibadmin on node1.test.com
Stack: classic openais (with plugin)
Current DC: node2.test.com - partition with quorum
Version: 1.1.8-7.el6-394e906
2 Nodes configured, 2 expected votes
3 Resources configured.
Online: [ node1.test.com node2.test.com ]
Resource Group: webservice
vip (ocf::heartbeat:IPaddr): Started node1.test.com
nfs (ocf::heartbeat:Filesystem): Started node1.test.com
httpd (lsb:httpd): Started node1.test.com
(5).最後咱們模擬一下資源故障
crm(live)# node
crm(live)node# standby
crm(live)node# show
node1.test.com: normal
standby: on
node2.test.com: normal
[root@node2 ~]# crm_mon
Last updated: Thu Aug 15 17:05:52 2013
Last change: Thu Aug 15 17:05:42 2013 via crm_attribute on node1.test.com
Stack: classic openais (with plugin)
Current DC: node2.test.com - partition with quorum
Version: 1.1.8-7.el6-394e906
2 Nodes configured, 2 expected votes
3 Resources configured.
Node node1.test.com: standby
Online: [ node2.test.com ]
Resource Group: webservice
vip (ocf::heartbeat:IPaddr): Started node2.test.com
nfs (ocf::heartbeat:Filesystem): Started node2.test.com
httpd (lsb:httpd): Started node2.test.com
當node1故障時,全部資源所有移動到時node2上,下面咱們再來訪問一下吧
你們能夠看到,照樣能訪問,好了今天的博客就到這邊,在下一篇博客中咱們將重點講解DRDB知識。^_^…… 見 http://www.linuxidc.com/Linux/2013-08/89035.htm