[Galaxy Kirin V10] [server] iSCSI deployment

step 1：iscsi Introduce

a、backstore, Back end storage

It corresponds to the device that provides actual storage space on the server side （ Note that it is only divided into areas , Unformatted , Storage devices without file systems , Such as unformatted disk sdb1）, Need a management name

b、target, Disk group

Is the client's access target , As a framework , By multiple lun form

c、lun, Logical unit

every last lun Need to be associated with a backend storage device , On the client side, it will be regarded as a virtual hard disk

d、 If you put iSCSI As a courier , You can think of back-end storage as a refrigerator , It's something that actually needs express delivery , The disk pack is a wooden box , It's safer to put the refrigerator in a wooden box ,lun It is to associate the refrigerator with the wooden box , So the actual step is to establish backstore Back end storage , Find the fridge first , Then create target Disk group , Create a wooden box , Last lun Put the refrigerator in a wooden box , Connect the two .

step 2：iSCSI Server side （target End ） To configure

1、 Basic interaction , Use targetcli Set up the configuration

# /backstore/block  create   Back end storage name   Actual device path

# /iscsi  create   Disk group IQN name

# /iscsi/ Disk group name /tpg1/luns  create   Back end storage path

# /iscsi/ Disk group name /tpg1/scls  create   The client IQN identification

# /iscsi/ Disk group name /tpg1/portals  create  IP Address   Port number   

2、iqn Naming specification

iqn Full name ISCSI Qualified Name

iqn.yyyy-mm. Reverse domain name ： Custom logo

Used to identify target Disk group , Also used to identify clients

Name example ：

iqn.2016-02.com.example:server0

iqn.2016-02.com.example:desktop0

（ Must be iqn start ; Followed by the year and month , The middle is separated by a horizontal bar , Note that the month must be an even number , If it is 2021 year 7 month , You must also write 2021-07, Otherwise, the verification fails ; Then there is the inverted domain name , For example, the domain name is baidu.com, Then it has to be written upside down com.baidu, The verification of the domain name is not very strict , Even if it's written as haha.xixi It doesn't matter ; Finally, the user-defined logo , Write it yourself ）

3、 Start deployment

（ The firewall configures itself , Turn off or set the area to trusted Or open 3260 port ）

# lsblk    // Here is a piece 20GB Free hard disk sdb, Separate out 10G Of sdb1 For network shared storage , Be careful sdb1 Don't format

# yum install targetcli

# targetcli      // use targetcli To configure

 

 /> ls    // Check the initial configuration interface , Support Tab completion

/> backstores/block create dev=/dev/sdb1 name=kylin   // Build back-end storage ,block Represents that the storage device type is block device type , Specify storage device sdb1, And named it kylin,name Name customization , It can be understood as creating a refrigerator

 /> ls   // View configuration changes , Store on the back end backstores There's one down there block Block device , The name is kylin, The actual equipment used is /dev/sdb1, The following configuration is directly used kylin representative /dev/sdb1 equipment

 

/> iscsi/  create  iqn.2021-07.com.kylinos:server   // Create disk groups , Note that the name of the disk group must match iqn Naming rules ,iqn See the above description for the naming rules , As shown in the figure below iscsi The default port is 3260, It can be understood as creating a wooden box

 

/> iscsi/  delete  iqn.2021-07.com.kylinos:server    //delete Parameters can be deleted for disk groups , This step can be skipped

/> ls     // Check the configuration , You can see the new disk group

 

 

/> iscsi/iqn.2021-07.com.kylinos:server/tpg1/luns  create  /backstores/block/kylin    // Associate disk groups with back-end storage ,tpg1 It's the goal , Followed by luns The way ,kylin Refers to /dev/sdb1, Put the refrigerator into the wooden box , The two are related

/> ls   // You can see iqn The next one is luns relation , The device is /dev/sdb1

/> iscsi/iqn.2021-07.com.kylinos:server/tpg1/acls  create  iqn.2021-07.com.kylinos:client     // This step is to establish acl Access control rights , It can be understood as filling in the information of the express recipient , It's called iqn.2021-07.com.kylinos:client People can sign for this express , Note that the name of the recipient must also conform to iqn Naming specification

 /> ls    // You can see acls The client name under access control , Below portals Is the default configuration generated automatically ,0.0.0.0:3260 Represents the default listener for all addresses of this machine 3260 port , The old version needs to be manually configured to listen to which address of the machine 3260 port , With centos For example ,centos7.5 No manual configuration is required by default ,centos7 You need to configure this item manually , The manual configuration method is ：/iscsi/ Disk group name /tpg1/portals  create  IP Address   Port number ,IP The address is suggested to be 0.0.0.0, Represents all addresses of this machine , All open to the outside world , No matter which address the client accesses, it can access 3260 Port corresponding service

 /> saveconfig   // Save configuration , In fact, it's direct exit Exiting the system will automatically save and exit

 /> exit   // sign out targetcli To configure

# systemctl restart target   // restart target service

# systemctl enable target    // Set power on self start

step 3：iSCSI client （initiator End ）

1、 Install the client package

# yum repolist   // Refresh yum cache

# yum  install iscsi-initiator-utils  -y

# vim /etc/iscsi/initiatorname.iscsi    // Modify the name claimed by the client , It corresponds to the name of the recipient set on the server , The name must be consistent with the client name set by the server

InitiatorName=iqn.2021-07.com.kylinos:client

 

 

# systemctl restart iscsid  // Restart client service , Refresh iqn name

# iscsiadm --mode discoverydb  --type  sendtargets  --portal  192.168.1.10  --discover  // Find out iscsi equipment , Back IP For the server IP, If it fails, please check the firewall configuration , This step can be understood as signing for the wooden box containing the refrigerator , There are also steps to unpack the box

 # man iscsiadm   // If you can't remember, you can use man Help search EXAMPLES You can get the command template

# systemctl  restart  iscsi   // Be careful iscsi There is no d, Yes d Is refresh iqn Name ,iscsi Is the real client service , Restarting is equivalent to the steps of unpacking ,iscsid It can be seen as iscsi Sub services of

# lsblk   // You can see the new disks added by the client sdb,10G, There was no such thing , Server side iscsi Shared , Next, the client can use the change storage normally , Partition 、 Format, etc

 # systemctl enable iscsi   // Set to boot from , So that the shared storage can be found every time you start up