Test multipath feature by hand (by quqi99)

**作者：张华 发表于：2017-02-16
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( http://blog.csdn.net/quqi99 )**

1, Create a VM with one NIC ens3 (10.5.9.40) and the second NIC ens7 (10.5.9.41) and the second disk /dev/vdc as iscsi server

nova keypair-add --pub-key ~/.ssh/id_rsa.pub mykeynova secgroup-add-rule default tcp 22 22 0.0.0.0/0nova secgroup-add-rule default icmp -1 -1 0.0.0.0/0nova boot --key-name mykey --image auto-sync/ubuntu-yakkety-16.10-amd64-server-20161214-disk1.img --flavor m1.small --nic net-id=$(neutron net-list |grep 'zhhuabj_admin_net' |awk '{print $2}') iscsi_server#add the second NIC ens7VM_ID=$(nova list |grep 'iscsi_server' |awk '{print $2}')nova interface-attach $VM_ID --net-id=$(neutron net-list |grep 'zhhuabj_admin_net' |awk '{print $2}')cinder create --display_name iscsi_server_volume 2nova volume-attach iscsi_server $(cinder list |grep 'iscsi_server_volume' |awk '{print $2}')FLOATING_IP=$(nova floating-ip-create |grep 'ext_net' |awk '{print $4}')nova add-floating-ip iscsi_server $FLOATING_IPssh ubuntu@10.230.69.180 -vssh ubuntu@10.230.69.180 sudo dhclient ens7

2, Login into iscsi server VM and set up target by hand

sudo apt-get install lvm2sudo pvcreate /dev/vdcsudo vgcreate cinder-volumes /dev/vdcsudo lvcreate -L 1.5G -n lv1 cinder-volumes  #will create /dev/cinder-volumes/lv1sudo apt-get install tgtsudo tgtadm --lld iscsi --op new --mode target --tid 1 --targetname iqn.2017-02.com.quqi:storage#Attach a LUNsudo tgtadm --lld iscsi --op new --mode logicalunit --tid 1 --lun 1 --backing-store /dev/cinder-volumes/lv1#persistentsudo tgt-admin --dump > /etc/tgt/conf.d/my-targets.confsudo service tgt restartcat /etc/tgt/conf.d/my-targets.confdefault-driver iscsi<target iqn.2017-02.com.quqi:storage>    backing-store /dev/cinder-volumes/lv1</target>#verify# sudo tgtadm --mode target --op show

3, Create another VM as iscsi client

nova boot --key-name mykey --image auto-sync/ubuntu-yakkety-16.10-amd64-server-20161214-disk1.img --flavor m1.small --nic net-id=$(neutron net-list |grep 'zhhuabj_admin_net' |awk '{print $2}') iscsi_clientFLOATING_IP=$(nova floating-ip-create |grep 'ext_net' |awk '{print $4}')nova add-floating-ip iscsi_client $FLOATING_IPssh ubuntu@10.230.69.181 -v

4, Set up iscsi client

sudo apt-get install open-iscsi multipath-toolssudo iscsiadm -m discovery -t sendtargets -p 10.5.9.40sudo iscsiadm -m discovery -t sendtargets -p 10.5.9.41$ sudo iscsiadm -m node10.5.9.41:3260,1 iqn.2017-02.com.quqi:storage10.5.9.40:3260,1 iqn.2017-02.com.quqi:storagesudo iscsiadm -m node --loginall=all$ sudo iscsiadm -m sessiontcp: [1] 10.5.9.41:3260,1 iqn.2017-02.com.quqi:storage (non-flash)tcp: [2] 10.5.9.40:3260,1 iqn.2017-02.com.quqi:storage (non-flash)$ sudo multipath -l360000000000000000e00000000010001 dm-0 IET,VIRTUAL-DISKsize=1.5G features='0' hwhandler='0' wp=rw|-+- policy='round-robin 0' prio=0 status=active| `- 3:0:0:1 sda 8:0  active undef running`-+- policy='round-robin 0' prio=0 status=enabled  `- 2:0:0:1 sdb 8:16 active undef runningsudo mkfs.ext4 /dev/mapper/360000000000000000e00000000010001sudo mkdir /testsudo mount -o _netdev /dev/mapper/360000000000000000e00000000010001 /test