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mfs分布式存儲+master端高可用

日期：2017/2/27 15:47:09 编辑：Linux教程

master采用keepalived+drbd實現高可用
mfsmaster 172.25.254.10
mfsbackup 172.25.254.11

VIP 是172.25.254.12

mfsmaster 和mfsbackup一定要主機名解析,同時主機名也必須和主機名解析一致。
uname -n查看你的名字~

drbd配置:
Mfsmaster mfsbackup 都做以下操作,首先安裝包，這是我自己打的rpm包。

安裝即可
vim /etc/drbd.d/mfs.res

resource mfs {                                                                                              
        meta-disk internal;
        device /dev/drbd1;
        syncer {
                verify-alg sha1;
        }
on mfsmaster {
        disk /dev/vda1;
        address 172.25.254.10:7789;
}
on mfsbackup {
        disk /dev/vda1;
        address 172.25.254.11:7789;
}
}

安裝mfs master

[root@mfsmaster etc]# cd  /etc
[root@mfsmaster etc]# mv mfsmaster.cfg.dist mfsmaster.cfg
[root@mfsmaster etc]# mv mfsexports.cfg.dist mfsexports.cfg
[root@mfsmaster etc]# mv mfsmetalogger.cfg.dist mfsmetalogger.cfg
[root@mfsmaster etc]# mv mfstopology.cfg.dist mfstopology.cfg

vim mfsmaster.cfg

WORKING_USER = nobody
WORKING_GROUP = nobody
SYSLOG_IDENT = mfsmaster
LOCK_MEMORY = 0
NICE_LEVEL = -19

EXPORTS_FILENAME = /etc/mfsexports.cfg

TOPOLOGY_FILENAME = /etc/mfstopology.cfg

DATA_PATH = /data1/drbd

BACK_LOGS = 50
BACK_META_KEEP_PREVIOUS = 1

REPLICATIONS_DELAY_INIT = 300
REPLICATIONS_DELAY_DISCONNECT = 3600

MATOML_LISTEN_HOST = *
MATOML_LISTEN_PORT = 9419

MATOCS_LISTEN_HOST = *
MATOCS_LISTEN_PORT = 9420

MATOCL_LISTEN_HOST = *
MATOCL_LISTEN_PORT = 9421

CHUNKS_LOOP_CPS = 100000
CHUNKS_LOOP_TIME = 300

CHUNKS_SOFT_DEL_LIMIT = 10
CHUNKS_HARD_DEL_LIMIT = 25
CHUNKS_WRITE_REP_LIMIT = 2
CHUNKS_READ_REP_LIMIT = 10

REJECT_OLD_CLIENTS = 0

vim mfsmetalogger.cfg

WORKING_USER = nobody                                                                                      
WORKING_GROUP = nobody 
SYSLOG_IDENT = mfsmetalogger
LOCK_MEMORY = 0
NICE_LEVEL = -19

DATA_PATH = /var/lib/mfs

BACK_LOGS = 50
BACK_META_KEEP_PREVIOUS = 3
META_DOWNLOAD_FREQ = 24

MASTER_RECONNECTION_DELAY = 5

MASTER_HOST = mfsmaster
MASTER_PORT = 9419

MASTER_TIMEOUT = 60

ok 為了方便，直接把這幾個文件復制到mfsbackup上就可以

[root@mfsmaster etc]# scp mfs* 172.25.254.11:/etc/
[email protected]'s password: 
mfsexports.cfg                                                                100% 4060     4.0KB/s   00:00    
mfsmaster.cfg                                                                 100%  849     0.8KB/s   00:00    
mfsmetalogger.cfg                                                             100%  401     0.4KB/s   00:00    
mfstopology.cfg                                                               100% 1123     1.1KB/s   00:00

master上執行

[root@mfsmaster etc]# drbdsetup /dev/drbd1 primary --force
[root@mfsmaster etc]# mkfs.ext4 /dev/drbd1

都執行

mkdir -p /data1/drbdchown -R nobody.nobody  /data1/drbd/

[root@mfsmaster mfs]# cp /var/lib/mfs/metadata.mfs.empty /data1/drbd/
[root@mfsmaster drbd]# mv metadata.mfs.empty metadata.mfs
[root@mfsmaster drbd]# mfsmaster

ok master 已經可以正常運行了

,為了保證無誤我們在backup上也測試一次。

[root@mfsmaster drbd]# mfsmaster stop
[root@mfsmaster drbd]# cd[root@mfsmaster ~]
# umount /dev/drbd1
[root@mfsmaster ~]# drbdadm secondary mfs

[root@mfsbackup drbd+mfs-rpm]# drbdadm primary mfs
[root@mfsbackup drbd+mfs-rpm]# mount /dev/drbd1 /data1/drbd/
[root@mfsbackup drbd+mfs-rpm]# mfsmaster

這個時候我們的master端已經全線部署完成，接下來我們要實現他的高可用，這個很重要

首先說明，我使用自己的方法很簡單的實現主斷備啟，但是是一次性的，也就是說，只支持一次主的mfsmaster斷了，backup可以接替，並不能來回。需要手工操作。

腳本寫的簡單後續有時間修改，網上有很多成品的，雖然很菜還是寫自己的。。

同樣是keepalived +drbd大神們都是全自動的

我這其實是一次性的但是輕量簡單呗。

安裝keepalived 兩端執行：

! Configuration File for keepalived

global_defs {
   notification_email {
     [email protected]
   }
   notification_email_from zabbix@server2.com
   smtp_server 172.25.254.2
   smtp_connect_timeout 30
   router_id mfs_master
}
vrrp_script check_drbd {
        script "/etc/keepalived/check_drbd.sh"
            interval 15     
    }
vrrp_instance mfs {
    state MASTER
    interface eth0
    virtual_router_id 51                                                                                                                                                 
    priority 150
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        172.25.254.12
    }
    track_script {
        check_drbd
        }
notify_master /etc/keepalived/master.sh
notify_backup /etc/keepalived/backup.sh
}

[root@mfsmaster keepalived]# vim check_drbd.sh

/bin/bash: Configuration: command not found
# File Name: check_drbd.sh
# Author: dty
# mail: [email protected]
# Created Time: Sun 02 Aug 2015 01:32:43 PM CST
#########################################################################
#!/bin/bash    
A=`ps -C mfsmaster --no-header |wc -l`
if [ $A -eq 0 ];then
    umount /data1/drbd/
    drbdadm secondary mfs
    killall keepalived     
fi

mfsbackup 上      cd /etc/keepalived
                寫兩個腳本 master.sh backup.sh

[root@mfsbackup keepalived]# cat backup.sh master.sh 
#!/bin/bash
mfsmaster stop
umount /dev/drbd1
drbdadm secondary mfs
#########################################################################
# File Name: master.sh
# Author: dty
# mail: [email protected]
# Created Time: Sun 02 Aug 2015 01:38:12 PM CST
#########################################################################
#!/bin/bash
drbdadm primary mfs
mount /dev/drbd1 /data1/drbd
mfsmaster start

vim /etc/keepalived.conf

! Configuration File for keepalived
  
global_defs { 
   notification_email { 
     [email protected]
   }      
   notification_email_from [email protected]
   smtp_server 172.25.254.2 
   smtp_connect_timeout 30
   router_id mfs_master
}       
vrrp_instance mfs {
    state BACKUP   
    interface eth0
    virtual_router_id 51
    priority 80
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        172.25.254.12
    }
notify_master /etc/keepalived/master.sh
notify_backup /etc/keepalived/backup.sh
}

此時我們可以實驗了

開啟mfsmaster，

開啟keepalived

mfsbackup上也啟動 keepalived

[root@mfsbackup keepalived]# /etc/init.d/keepalived start

我們把主上的mfsmaster關掉

可以看到vip已經沒了，轉移到了備機上

服務已經完美轉移了。

這個時候我們來搞定客戶端和chunkserver的安裝

yum localinstall mfs-chunkserver-1.6.26-1.x86_64.rpm -y

mv mfschunkserver.cfg.dist mfschunkserver

mkdir -p /data1/mfs //設置個目錄存放數據

chown nobody.nobody /data1/mfs

vim /etc/mfschunkserver

WORKING_USER = nobody                                                      
WORKING_GROUP = nobody 
SYSLOG_IDENT = mfschunkserver
LOCK_MEMORY = 0
NICE_LEVEL = -19

DATA_PATH = /data1/mfs

MASTER_RECONNECTION_DELAY = 5

BIND_HOST = *
MASTER_HOST = 172.25.254.12
MASTER_PORT = 9420

MASTER_TIMEOUT = 60

CSSERV_LISTEN_HOST = *
CSSERV_LISTEN_PORT = 9422

HDD_CONF_FILENAME = /etc/mfshdd.cfg
HDD_TEST_FREQ = 10

設置chunk存放路徑

[root@server7 ~]# cat /etc/mfshdd.cfg
# mount points of HDD drives
#
#/mnt/hd1
#/mnt/hd2
#etc.
/data1/mfs/

chunkserver已經部署完成了有多個以此類推就好了.

下來就是客戶端的安裝及使用了

# yum localinstall -y mfs-client-1.6.26-1.x86_64.rpm
# cd /etc# cp mfsmount.cfg.dist mfsmount.cfg
# vi mfsmount.cfg定義客戶端默認掛載mfsmaster=mfsmaster/mnt/mfs# mfsmount
[root@server4 ~]# df -h Filesystem                    Size  Used Avail Use% Mounted on/dev/mapper/VolGroup-lv_root  6.7G  978M  5.4G  16% /tmpfs

Linux/1672.html' target='_blank'>inodes with permission denied: 0

[root@server4 mfs]# cp /etc/passwd leaf1
[root@server4 mfs]# cp /etc/passwd leaf2
[root@server4 mfs]#  mfsfileinfo leaf1/passwd

leaf1/passwd:
    chunk 0: 0000000000000008_00000001 / (id:8 ver:1)
        copy 1: 172.25.254.7:9422
[root@server4 mfs]#  mfsfileinfo leaf2/passwd
leaf2/passwd:
    chunk 0: 0000000000000009_00000001 / (id:9 ver:1)
        copy 1: 172.25.254.8:9422
        copy 2: 172.25.254.9:9422
ok 效果就這樣粗來了

其他的mfs的使用這裡不做贅述，主要為了驗證我們的高可用機制是否可行，就到這裡了

ps：當出現問題調轉到backup後，如果主的正常了，我們手動切換必須遵守以下步驟

停掉mfsmaster服務

mfsmaster stop

umount /dev/drbd1

drbdadm secondary mfs

主機：

1.drbdadm primary mfs

2.mount /dev/drbd1 /data1/drbd

3.mfsmaster start

4.keepalived start

還有要提到的就是可能會出現腦裂，這一般時操作不按順序，也可能有其他原因，下面是網上大神寫的，

腦裂的處理方法

drbd1主,drbd2輔

1，正常情況下狀態：
 [root@drbd1 ~]# cat /proc/drbd 
 version: 8.3.8 (api:88/proto:86-94)
 : 299AFE04D7AFD98B3CA0AF9 
 0: cs:Connected ro:Primary/Secondary ds:UpToDate/UpToDate C r----
  ns:2144476 nr:0 dw:36468 dr:2115769 al:14 bm:129 lo:0 pe:0 ua:0 ap:0 ep:1 wo:b oos:0
  
[root@drbd2 ~]# cat /proc/drbd 
  
version: 8.3.8 (api:88/proto:86-94)
  
srcversion: 299AFE04D7AFD98B3CA0AF9 
  
 0: cs:Connected ro:Secondary/Primary ds:UpToDate/UpToDate C r----
  
    ns:0 nr:2141684 dw:2141684 dr:0 al:0 bm:130 lo:0 pe:0 ua:0 ap:0 ep:1 wo:b oos:0
  
2，drbd1故障後
  
drbd1狀態：
  
[root@drbd1 ~]# cat /proc/drbd 
  
version: 8.3.8 (api:88/proto:86-94)
  
srcversion: 299AFE04D7AFD98B3CA0AF9 
  
 0: cs:StandAlone ro:Primary/Unknown ds:UpToDate/DUnknown   r----
  
    ns:4 nr:102664 dw:102668 dr:157 al:1 bm:8 lo:0 pe:0 ua:0 ap:0 ep:1 wo:b oos:0
  
drbd2的狀態：
  
[root@drbd2 ~]# cat /proc/drbd 
  
version: 8.3.8 (api:88/proto:86-94)
  
srcversion: 299AFE04D7AFD98B3CA0AF9 
  
 0: cs:WFConnection ro:Secondary/Unknown ds:UpToDate/DUnknown C r----
  
    ns:0 nr:2141684 dw:2141684 dr:0 al:0 bm:130 lo:0 pe:0 ua:0 ap:0 ep:1 wo:b oos:0
  
3，處理方法：
  
a，將secondary配置成primary角色
  
[root@drbd2 ~]# drbdsetup /dev/drbd0 primary -o
  
[root@drbd2 ~]# cat /proc/drbd 
  
version: 8.3.8 (api:88/proto:86-94)
  
srcversion: 299AFE04D7AFD98B3CA0AF9 
  
 0: cs:WFConnection ro:Primary/Unknown ds:UpToDate/Outdated C r----
  
    ns:0 nr:2141684 dw:2141684 dr:0 al:0 bm:130 lo:0 pe:0 ua:0 ap:0 ep:1 wo:b oos:0
  
掛載：
  
[root@drbd2 /]# mount /dev/drbd0 /data1
  
[root@drbd2 data1]# ll
  
total 10272
  
-rw-r--r-- 1 root root 10485760 Feb 13 11:26 aa.img
  
drwx------ 2 root root    16384 Feb 13 11:25 lost+found
  
這個時候drbd2開始提供服務，開始寫數據
  
drbd1主恢復正常後：
  
[root@drbd1 ~]# cat /proc/drbd
  
version: 8.3.8 (api:88/proto:86-94)
  
srcversion: 299AFE04D7AFD98B3CA0AF9 
  
 0: cs:StandAlone ro:Primary/Unknown ds:UpToDate/DUnknown   r----
  
    ns:2144476 nr:0 dw:36484 dr:2115769 al:14 bm:129 lo:0 pe:0 ua:0 ap:0 ep:1 wo:b oos:8
  
drbd1狀態是:StandAlone，此時，drbd1是不會和drbd2互相聯系的
  
我們來查看下日志：
  
[root@drbd1 ~]# tailf /var/log/messages
  
Feb 13 16:14:27 drbd1 kernel: block drbd0: helper command: /sbin/drbdadm split-brain minor-0
  
Feb 13 16:14:27 drbd1 kernel: block drbd0: helper command: /sbin/drbdadm split-brain minor-0 exit code 0 (0x0)
  
Feb 13 16:14:27 drbd1 kernel: block drbd0: conn( WFReportParams -> Disconnecting ) 
  
Feb 13 16:14:27 drbd1 kernel: block drbd0: error receiving ReportState, l: 4!
  
Feb 13 16:14:27 drbd1 kernel: block drbd0: asender terminated
  
Feb 13 16:14:27 drbd1 kernel: block drbd0: Terminating drbd0_asender
  
Feb 13 16:14:27 drbd1 kernel: block drbd0: Connection closed
  
Feb 13 16:14:27 drbd1 kernel: block drbd0: conn( Disconnecting -> StandAlone ) 
  
Feb 13 16:14:27 drbd1 kernel: block drbd0: receiver terminated
  
Feb 13 16:14:27 drbd1 kernel: block drbd0: Terminating drbd0_receiver
  
腦裂出現！
  
解決方法：
  
1>,我們需要將現在的drbd1角色修改為secondary
  
[root@drbd1 ~]# drbdadm secondary r0
  
[root@drbd1 ~]# drbdadm -- --discard-my-data connect r0  ##該命令告訴drbd，secondary上的數據不正確，以primary上的數據為准。
  
2>，我們還需要在drbd2上執行下面操作
  
[root@drbd2 /]# drbdadm connect r0
  
這樣drbd1就能和drbd2開始連接上了，並且保證數據不會丟失：
  
[root@drbd1 ~]# cat /proc/drbd      
  
version: 8.3.8 (api:88/proto:86-94)
  
srcversion: 299AFE04D7AFD98B3CA0AF9 
  
 0: cs:Connected ro:Secondary/Primary ds:UpToDate/UpToDate C r----
  
    ns:0 nr:20592 dw:20592 dr:0 al:0 bm:4 lo:0 pe:0 ua:0 ap:0 ep:1 wo:b oos:0