Centos7.0下通過Corosync+pacemaker+pcs+drbd實現mariadb的高可用 http://blog.csdn.net/wylfengyujiancheng/article/details/50670327
一、操作系統配置
1.1、準備：
兩個節點node01和node02均按照centos7.0系統，每個節點兩塊磁盤，一塊用作根分區一塊用作drbd
192.168.100.11 node01
192.168100.12 node02
修改主機名：
節點1
# hostnamectl set-hostname node01
# su -l
節點2
# hostnamectl set-hostname node02
# su -l
1.2、磁盤分區如下
[root@ha-node2 corosync]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 20G 0 disk
├─sda1 8:1 0 500M 0 part /boot
└─sda2 8:2 0 19.5G 0 part
├─centos-swap253:0 0 2G 0lvm [SWAP]
└─centos-root253:1 0 17.5G 0 lvm /
sdb 8:16 0 20G 0 disk
sr0 11:0 1 1024M 0 rom
[root@ha-node1 corosync]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 20G 0 disk
├─sda1 8:1 0 500M 0 part /boot
└─sda2 8:2 0 19.5G 0 part
├─centos-swap253:0 0 2G 0lvm [SWAP]
└─centos-root253:1 0 17.5G 0 lvm /
sdb 8:16 0 20G 0 disk
sr0 11:0 1 1024M 0 rom
1.3、創建lvm（每個節點都需執行）
# pvcreate /dev/sdb
# vgcreate data /dev/sdb
# lvcreate --size 2G --name MySQL data
1.4、關閉防火墻（每個節點都需執行）
setenforce 0
sed -i.bak "s/SElinux=enforcing/SELINUX=permissive/g"/etc/selinux/config
systemctl disable firewalld.service
systemctl stop firewalld.service
iptables --flush
1.5、配置hosts文件
echo '192.168.100.11 node01 ' >>/etc/hosts
echo '192.168.100.12 node02 ' >>/etc/hosts
1.6、配置ntp（10.239.41.128為ntp服務器）每個節點都需執行
# chkconfig chronyd off
# chkconfig ntpd on
# sed -i "/^server/ 3.centos.pool/a server/ 10.239.41.128 "/etc/ntp.conf
# service ntpd start
# ntpq -p
1.6、配置互信（每個節點都需執行）
# ssh-keygen -t dsa -f ~/.ssh/id_dsa -N ""
# ssh-copy-id ha-node1
# ssh-copy-id ha-node2
二、安裝drbd
2.1、安裝drbd軟件（各個節點）
# rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
#rpm-Uvh http://www.elrepo.org/elrepo-release-7.0-2.el7.elrepo.noarch.rpm
# yum install -y kmod-drbd84 drbd84-utils
2.2、配置文件介紹
/etc/drbd.conf #主配置文件
/etc/drbd.d/global_common.conf #全局配置文件
a、/etc/drbd.conf說明
主配置文件中包含了全局配置文件及”drbd.d/”目錄下以.res結尾的文件
# You can find an example in /usr/share/doc/drbd.../drbd.conf.example
include "drbd.d/global_common.conf";
include "drbd.d/*.res";
b、/etc/drbd.d/global_common.conf說明
global {
usage-count no; #是否參加DRBD使用統計，默認為yes。官方統計drbd的裝機量
# minor-count dialog-refreshdisable-ip-verification
}
common {
PRotocolC; #使用DRBD的同步協議
handlers {
# These are EXAMPLEhandlers only.
# They may have severeimplications,
# like hard resetting thenode under certain circumstances.
# Be careful when chosingyour poison.
pri-on-incon-degr"/usr/lib/drbd/notify-pri-on-incon-degr.sh; /usr/lib/drbd/notify-emergency-reboot.sh;echo b > /proc/sysrq-trigger ; reboot -f";
pri-lost-after-sb "/usr/lib/drbd/notify-pri-lost-after-sb.sh;/usr/lib/drbd/notify-emergency-reboot.sh; echo b > /proc/sysrq-trigger ;reboot -f";
local-io-error "/usr/lib/drbd/notify-io-error.sh;/usr/lib/drbd/notify-emergency-shutdown.sh; echo o > /proc/sysrq-trigger ;halt -f";
# fence-peer"/usr/lib/drbd/crm-fence-peer.sh";
# split-brain"/usr/lib/drbd/notify-split-brain.sh root";
# out-of-sync"/usr/lib/drbd/notify-out-of-sync.sh root";
# before-resync-target"/usr/lib/drbd/snapshot-resync-target-lvm.sh -p 15 -- -c 16k";
# after-resync-target/usr/lib/drbd/unsnapshot-resync-target-lvm.sh;
}
startup {
# wfc-timeoutdegr-wfc-timeout outdated-wfc-timeout wait-after-sb
}
options {
# cpu-maskon-no-data-accessible
}
disk {
on-io-error detach; #配置I/O錯誤處理策略為分離
# size max-bio-bvecson-io-error fencing disk-barrier disk-flushes
# disk-drain md-flushesresync-rate resync-after al-extents
# c-plan-aheadc-delay-target c-fill-target c-max-rate
# c-min-rate disk-timeout
}
net {
# protocol timeoutmax-epoch-size max-buffers unplug-watermark
# connect-int ping-intsndbuf-size rcvbuf-size ko-count
# allow-two-primariescram-hmac-alg shared-secret after-sb-0pri
# after-sb-1priafter-sb-2pri always-asbp rr-conflict
# ping-timeoutdata-integrity-alg tcp-cork on-congestion
# congestion-fillcongestion-extents csums-alg verify-alg
# use-rle
}
syncer{ rate1024M;}
}
注釋： on-io-error 策略可能為以下選項之一
detach 分離：這是默認和推薦的選項，如果在節點上發生底層的硬盤I/O錯誤，它會將設備運行在Diskless無盤模式下
pass_on：DRBD會將I/O錯誤報告到上層，在主節點上，它會將其報告給掛載的文件系統，但是在此節點上就往往忽略（因此此節點上沒有可以報告的上層）
-local-in-error：調用本地磁盤I/O處理程序定義的命令；這需要有相應的local-io-error調用的資源處理程序處理錯誤的命令；這就給管理員有足夠自由的權力命令命令或是腳本調用local-io-error處理I/O錯誤
c、定義一個資源
新建/etc/drbd.d/MySQL.res并寫入下列內容
resource mysql { #資源名稱
protocol C; #使用協議
meta-disk internal;
device /dev/drbd1; #DRBD設備名稱
syncer {
verify-alg sha1;# 加密算法
}
net {
allow-two-primaries;
}
on ha-node1 {
disk /dev/data/mysql; drbd1使用的磁盤分區為"mysql"
address 192.168.8.51:7789; #設置DRBD監聽地址與端口
}
on ha-node2 {
disk /dev/data/mysql;
address 192.168.8.52:7789;
}
}
2.4、將配置文件拷貝到node2上
# scp -rp /etc/drbd.d/* node02:/etc/drbd.d/1
2.5、啟用drbd
# drbdadm create-md mysql
# modprobe drbd
# drbdadm up mysql
# drbdadm -- --force primary mysql
1
查看狀態
# cat /proc/drbd 1
1
2.6、配置對端節點
# ssh node02 “drbdadm create-md mysql”
# ssh node02 “modprobe drbd”
# ssh node02 “drbdadm up mysql”
2.7、格式化設備并掛載
# mkfs.xfs /dev/drbd1
meta-data=/dev/drbd1 isize=256 agcount=4, agsize=65532 blks
= sectsz=512 attr=2, projid32bit=1
= crc=0 finobt=0
data = bsize=4096 blocks=262127, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=0
log =internal log bsize=4096 blocks=853, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
掛載設備
# mount /dev/drbd1 /mnt/drbd
三、安裝集群軟件
3.1安裝相關軟件包
# yum install -y pacemaker pcs psmisc policycoreutils-python1
啟動pcs服務并保持開機啟動
# systemctl start pcsd.service
# systemctl enable pcsd.service
3.2修改用戶hacluster的密碼（各個節點）
# passwd hacluster
密碼：hacluster
四、安裝mysql（各個節點）
4.1、安裝軟件
# yum install epel* -y
# yum install mariadb mariadb-server MySQL-python
備注：修改 /etc/my.cnf 指定的數據庫綁定目錄（datadir=/mnt/drbd）
和修改 數據庫綁定的目錄 權限（chown –Rmysql.mysql /mnt/drbd）
4.2、禁止mysql開機啟動
# chkconfig mariadb off
五、配置corosync
5.1認證各個節點，并創建集群（注意如果有代理記得取消）
# pcs cluster auth node01 node02
# pcs cluster setup --name mycluster node01 node02
5.2啟動集群
[root@ha-node1 ~]# pcs cluster start --all
ha-node1: Starting Cluster...
ha-node2: Starting Cluster...
5.3驗證corosync的安裝
[root@ha-node1 ~]# corosync-cfgtool -s
Printing ring status.
Local node ID 1
RING ID 0
id = 192.168.8.51
status = ring 0 active with no faults
5.4查看接入成員
# corosync-cmapctl | grep members
runtime.totem.pg.mrp.srp.members.1.config_version (u64) = 0
runtime.totem.pg.mrp.srp.members.1.ip (str) = r(0) ip(192.168.8.51)
runtime.totem.pg.mrp.srp.members.1.join_count (u32) = 1
runtime.totem.pg.mrp.srp.members.1.status (str) = joined
runtime.totem.pg.mrp.srp.members.2.config_version (u64) = 0
runtime.totem.pg.mrp.srp.members.2.ip (str) = r(0) ip(192.168.8.52)
runtime.totem.pg.mrp.srp.members.2.join_count (u32) = 2
runtime.totem.pg.mrp.srp.members.2.status (str) = joined
5.5查看corosync狀態
# pcs status corosync
Membership information
--------------------------
Nodeid Votes Name
1 1 ha-node1 (local)
2 1 ha-node2
5.6檢查pacemaker的安裝
# ps axf
PID TTY STAT TIME COMMAND
2 ? S 0:00 [kthreadd]
...lots of processes...
1362 ? Ssl 0:35 corosync
1379 ? Ss 0:00 /usr/sbin/pacemakerd -f
1380 ? Ss 0:00 /_ /usr/libexec/pacemaker/cib
1381 ? Ss 0:00 /_ /usr/libexec/pacemaker/stonithd
1382 ? Ss 0:00 /_ /usr/libexec/pacemaker/lrmd
1383 ? Ss 0:00 /_ /usr/libexec/pacemaker/attrd
1384 ? Ss 0:00 /_ /usr/libexec/pacemaker/pengine
1385 ? Ss 0:00 /_ /usr/libexec/pacemaker/crmd
5.7檢查pcs status
[root@ha-node1 ~]# pcs status
Cluster name: mycluster
WARNING: no stonith devices and stonith-enabled is not false
Last updated: Tue Dec 16 16:15:29 2014
Last change: Tue Dec 16 15:49:47 2014
Stack: corosync
Current DC: ha-node2 (2) - partition with quorum
Version: 1.1.12-a14efad
2 Nodes configured
0 Resources configured
Online: [ ha-node1 ha-node2 ]
Full list of resources:
PCSD Status:
ha-node1: Online
ha-node2: Online
Daemon Status:
corosync: active/disabled
pacemaker: active/disabled
pcsd: active/enabled
5.8查看系統中error（stonith除外）
# journalctl | grep -i error1
1
六、配置集群（任選一個節點）
6.1集群屬性
投票屬性
# pcs property set no-quorum-policy=ignore
集群故障時候服務遷移
# pcs resource defaults migration-threshold=1
由于兩個節點無stonith設備
# pcs property set stonith-enabled=false
在node1恢復后，為防止node2資源遷回node01（遷來遷去對還是會對業務有一定影響）
# pcs resource defaults resource-stickiness=100
# pcs resource defaults
設置資源超時時間
# pcs resource op defaults timeout=90s
# pcs resource op defaults
驗證，正常無回顯
# crm_verify –L -V
6.2配置浮動IP
# pcs resource create vip ocf:heartbeat:IPaddr2 ip=192.168.100.2 cidr_netmask=24op monitor interval=30s
vip為自定義的一個集群IP的名稱，監控時間為30S
6.3配置drbd高可用
# umount /dev/drbd1（各個節點）
創建文件
# pcs cluster cib drbd_cfg
創建DRBD資源
#pcs -f drbd_cfg resource create DRBD ocf:linbit:drbddrbd_resource=mysql op monitor interval=60s
clone資源
# pcs -f drbd_cfg resource master DRBDClone DRBD /
master-max=1 master-node-max=1 clone-max=2 clone-node-max=1 /
notify=true
查看配置
[root@ha-node1 ~]# pcs -f drbd_cfg resource show
ClusterIP (ocf::heartbeat:IPaddr2): Started
mysqlSite (ocf::heartbeat:apache): Started
Master/Slave Set: mysqlDataClone [mysqlData]
Stopped: [node01 node02 ]
提交配置
# pcs cluster cib-push drbd_cfg
查看狀態
[root@ha-node1 ~]# pcs status
Cluster name: mycluster
Last updated: Fri Aug 14 09:29:41 2015
Last change: Fri Aug 14 09:29:25 2015
Stack: corosync
Current DC: ha-node1 (1) - partition with quorum
Version: 1.1.12-a14efad
2 Nodes configured
4 Resources configured
Online: [ ha-node1 ha-node2 ]
Full list of resources:
ClusterIP (ocf::heartbeat:IPaddr2): Started ha-node1
mysqlSite (ocf::heartbeat:apache): Started ha-node1
Master/Slave Set: mysqlDataClone [mysqlData]
Masters: [ ha-node1 ]
Slaves: [ ha-node2 ]
PCSD Status:
ha-node1: Online
ha-node2: Online
Daemon Status:
corosync: active/disabled
pacemaker: active/disabled
pcsd: active/enabled
確保模塊載入
# echo drbd >/etc/modules-load.d/drbd.conf
6.4配置文件系統高可用
創建文件
# pcs cluster cib fs_cfg
創建資源dbFS
# pcs -f fs_cfg resource create dbFS ocf:heartbeat:Filesystemdevice='/dev/drbd1' directory='/mnt/drbd' fstype='xfs'
將dbFS和DRBDClone綁定在一起
# pcs -f fs_cfg constraint colocation add dbFS with DRBDClone INFINITYwith-rsc-role=Master
設置啟動順序
# pcs -f fs_cfg constraint order promote DRBDClone then start dbFS
提交配置
# pcs cluster cib-push fs_cfg
6.5配置mariadb高可用 (2選一)
pcs resource create Mysql systemd:mariadbbinary="/usr/libexec/mysqld" config="/etc/my.cnf"datadir="/mnt/drbd/" pid="/var/run/mariadb/mariadb.pid" socket="/var/lib/mysql/mysql.sock"op start timeout=180s op stop timeout=180s op monitor interval=20s timeout=60s
配置資源關系
# pcs constraint colocation add Mysql vip INFINITY
pcs constraintcolocation add vip dbFS INFINITY
設置啟動順序
# pcs constraintorder dbFS then Mysql
測試： 數據庫權限
( GRANT ALL PRIVILEGES ON *.* TO 'root'@'%'WITH GRANT OPTION;)
（GRANT ALL PRIVILEGESON *.* TO 'root'@'%'IDENTIFIED BY ‘mypassWord’ WITH GRANT OPTION; ）
>FLUSH PRIVILEGES;
查看資源約束關系
# pcs constraint –full
查詢系統狀態
# pcs status
七、群集操作命令
7.1、驗證群集安裝
# pacemakerd -F ## 查看pacemaker組件，ps axf | greppacemaker
# corosync-cfgtool -s ## 查看corosync序號
# corosync-cmapctl | grepmembers ## corosync 2.3.x
# corosync-objctl | grep members## corosync 1.4.x
7.2、查看群集資源
# pcs resource standards ## 查看支持資源類型
# pcs resource providers ## 查看資源提供商
# pcs resource agents ## 查看所有資源代理
# pcs resource list ## 查看支持資源列表
# pcs stonith list ## 查看支持Fence列表
# pcs property list --all ## 顯示群集默認變量參數
# crm_simulate -sL ## 檢驗資源 score 值
7.3、使用群集腳本
# pcs cluster cib ra_cfg ## 將群集資源配置信息保存在指定文件
# pcs -f ra_cfg resource create## 創建群集資源并保存在指定文件中（而非保存在運行配置）
# pcs -f ra_cfg resource show ##顯示指定文件的配置信息，檢查無誤后
# pcs cluster cib-push ra_cfg ##將指定配置文件加載到運行配置中
7.4、STONITH 設備操作
# stonith_admin -I ## 查詢fence設備
# stonith_admin -M -a agent_name ## 查詢fence設備的元數據，stonith_admin -M-a fence_vmware_soap
# stonith_admin --reboot nodename ## 測試 STONITH 設備
7.5、查看群集配置
# crm_verify -L -V ## 檢查配置有無錯誤
# pcs property ## 查看群集屬性
# pcs stonith ## 查看stonith
# pcs constraint ## 查看資源約束
# pcs config ## 查看群集資源配置
# pcs cluster cib ## 以xml格式顯示群集配置
7.6、管理群集
# pcs status ## 查看群集狀態
# pcs status cluster
# pcs status corosync
# pcs cluster stop [node11] ## 停止群集
# pcs cluster start --all ## 啟動群集
# pcs cluster standby node11 ## 將節點置為后備standby狀態，pcs clusterunstandby node11
# pcs cluster destroy [--all] ##刪除群集，[--all]同時恢復corosync.conf文件
# pcs resource cleanup ClusterIP## 清除指定資源的狀態與錯誤計數
# pcs stonith cleanupvmware-fencing ## 清除Fence資源的狀態與錯誤計數
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