配置iscsi多路徑實現磁盤掛載高可用
1.1 准備實驗環境
如果存儲服務器到交換機只有一條線路的時候，那么一條線路出現故障，整個就沒法使用了，所以多線路可以解決這個問題，避免單點故障
通過VMware模擬多路徑，使用下面的拓撲：
將k92配置成ip san，將k92上的sdb1分區，通過ip san 共享出去。
服務器端： target k92
客戶端： initiator k93
2、固化兩台電腦的IP
1.3 搭建target服務器
[root@k92 ~]# yum -y install targetcli
[root@k92 yum.repos.d]# targetcli
/> /backstores/block create kezi /dev/sdb
/> /iscsi create iqn.2019-09.cn.k92:server
/> /iscsi/iqn.2019-09.cn.k92:server/tpg1/acls/ create iqn.2019-09.cn.k92:k93
/> /iscsi/iqn.2019-09.cn.k92:server/tpg1/luns/ create /backstores/block/kezi
添加雙IP
/> /iscsi/iqn.2019-09.cn.k92:server/tpg1/portals/ delete 0.0.0.0 3260
Deleted network portal 0.0.0.0:3260
/> /iscsi/iqn.2019-09.cn.k92:server/tpg1/portals/ create 192.168.1.92 3260
Using default IP port 3260
Created network portal 192.168.1.92:3260.
/> /iscsi/iqn.2019-09.cn.k92:server/tpg1/portals/ create 192.168.2.2 3260
Using default IP port 3260
Created network portal 192.168.2.2:3260.
保存
/> saveconfig
/> exit
啟動iscsi
[root@k92 ~]# systemctl restart target && systemctl enable target
Created symlink from /etc/systemd/system/multi-user.target.wants/target.service to /usr/lib/systemd/system/target.service.
[root@k92 ~]# netstat -antup | grep 3260
tcp 0 0 192.168.1.92:3260 0.0.0.0:* LISTEN -
tcp 0 0 192.168.2.2:3260 0.0.0.0:* LISTEN
1.4 搭建target客戶端並掛載存儲
[root@k93 yum.repos.d]# yum install -y iscsi-initiator-utils
[root@k93 yum.repos.d]# systemctl start iscsi
[root@k93 yum.repos.d]# systemctl start iscsi
[root@k93 yum.repos.d]# systemctl enable iscsi
[root@k93 yum.repos.d]# systemctl enable iscsid
[root@k93 yum.repos.d]# vim /etc/iscsi/initiatorname.iscsi
InitiatorName=iqn.2019-09.cn.k92:k93
重啟客戶端
[root@k93 yum.repos.d]# systemctl restart iscsid
發現ISCSI
[root@k93 yum.repos.d]# iscsiadm -m discovery -t st -p 192.168.2.2
192.168.2.2:3260,1 iqn.2019-09.cn.k92:server
192.168.1.92:3260,1 iqn.2019-09.cn.k92:server
連接ISCSI設備
[root@k93 yum.repos.d]# iscsiadm -m node --login
Logging in to [iface: default, target: iqn.2019-09.cn.k92:server, portal: 192.168.2.2,3260] (multiple)
Logging in to [iface: default, target: iqn.2019-09.cn.k92:server, portal: 192.168.1.92,3260] (multiple)
Login to [iface: default, target: iqn.2019-09.cn.k92:server, portal: 192.168.2.2,3260] successful.
Login to [iface: default, target: iqn.2019-09.cn.k92:server, portal: 192.168.1.92,3260] successful.
查看設備
[root@k93 yum.repos.d]# ls /dev/sd*
/dev/sda /dev/sda1 /dev/sda2 /dev/sda3 /dev/sdb /dev/sdc
[root@k93 yum.repos.d]# blkid /dev/sdc /dev/sdb
/dev/sdc: UUID="b54cd2c8-c4c9-4fa0-8703-97472e0da238" TYPE="xfs"
/dev/sdb: UUID="b54cd2c8-c4c9-4fa0-8703-97472e0da238" TYPE="xfs"
格式化掛載(已格式化忽略)
[root@k93 yum.repos.d]# mkfs.xfs /dev/sdb -f
測試掛載寫數據
[root@k93 yum.repos.d]# mount /dev/sdb /opt
[root@k93 yum.repos.d]# echo aabbcc >/opt/a.txt
[root@k93 yum.repos.d]# mkdir /test
跳過UUID掛載
[root@k93 yum.repos.d]# mount -t xfs -o nouuid /dev/sdc /test
服務端查看鏈接狀態
[root@k93 yum.repos.d]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 28G 3.9G 24G 14% /
devtmpfs 477M 0 477M 0% /dev
tmpfs 488M 0 488M 0% /dev/shm
tmpfs 488M 7.8M 480M 2% /run
tmpfs 488M 0 488M 0% /sys/fs/cgroup
/dev/sda1 497M 137M 361M 28% /boot
tmpfs 98M 0 98M 0% /run/user/0
/dev/sdb 1014M 33M 982M 4% /opt
/dev/sdc 1014M 33M 982M 4% /test
[root@k93 yum.repos.d]# netstat -antup | grep 3260
tcp 0 0 192.168.2.3:47562 192.168.2.2:3260 ESTABLISHED 2218/iscsid
tcp 0 0 192.168.1.93:53688 192.168.1.92:3260 ESTABLISHED 2218/iscsid
查看連接結構：
[root@k93 yum.repos.d]# yum install tree -y
[root@k93 yum.repos.d]# tree /var/lib/iscsi/
/var/lib/iscsi/
├── ifaces
├── isns
├── nodes
│ └── iqn.2019-09.cn.k92:server
│ ├── 192.168.1.92,3260,1
│ │ └── default
│ └── 192.168.2.2,3260,1
│ └── default
├── send_targets
│ ├── 192.168.2.2,3260
│ │ ├── iqn.2019-09.cn.k92:server,192.168.1.92,3260,1,default -> /var/lib/iscsi/nodes/iqn.2019-09.cn.k92:server/192.168.1.92,3260,1
│ │ ├── iqn.2019-09.cn.k92:server,192.168.2.2,3260,1,default -> /var/lib/iscsi/nodes/iqn.2019-09.cn.k92:server/192.168.2.2,3260,1
│ │ └── st_config
│ └── 192.168.2.3,3260
│ └── st_config
├── slp
└── static
13 directories, 4 files