使用iSCSI协议实现Ceph提供块存储

admin

通过配置文件来创建 target
; Z) }  K& I; n$ q: Z* ^vim /etc/tgt/targets.conf
3 a5 T4 e/ }; ]5 P) V+ Q
5 l* \' P5 I4 H3 b* |' M4 ~7 ~# Empty targets configuration file -- please see the package
# documentation directory for an example.
6 S, g1 d. ?% C! r7 b#
/ z2 X3 ]2 h% v( N4 p, Q# You can drop individual config snippets into /etc/tgt/conf.d
include /etc/tgt/conf.d/*.conf
<target iqm.2021-7-02.rbd.com:compute01>
! q7 T( m; \. v3 A2 j   driver iscsi
   bs-type rbd
2 J, i! q( Z/ X+ c7 s# W   backing-store iscsitgtpool/imagerbd1
3 E) M* W! j! o/ V5 T8 i# l</target>
% U" O( c9 G- Y( k7 E4 Y6 A
如果有多个就写多个即可：
# ~7 {6 S! N4 F<target iqm.2021-7-02.rbd.com1:compute01>
   driver iscsi
5 e8 ]1 s7 [; r   bs-type rbd
   backing-storerbdrac/imagerbd2
, U0 ^! l$ m# R' u3 _; g& k5 D</target>
- ~7 k  }4 {; S; Y
+ ]' P' N: L: E1 K6 K: H重启tgtd服务：
- W- e% @; h. M9 O6 ksystemctl restart tgtd.service

3、        查看激活的 target
[root@compute01 ~]# tgtadm --lld iscsi --mode target --op show

admin

配置多路径：
# yum install -y device-mapper-multipath

( M6 b4 M, r3 N0 P* W: H# cat > /etc/multipath.conf <<EOF
defaults {
( x+ p' y% d8 N) ~; Uuser_friendly_names yes
udev_dir /dev
9 _. B+ p$ P! E7 mpath_grouping_policy multibus
failback immediate
no_path_retry fail
}
& B7 G8 m: W$ d! C1 sEOF
" I1 \% @' k5 `- l( R/ U
设置开机启动：
. R9 C4 c$ Y  \" ?systemctl enable multipathd.service
systemctl restart multipathd.service

! f( T7 J- F* O+ S" P, b$ Q[root@iscsi ~]# multipath -ll
Jul 02 13:47:18 | /etc/multipath.conf line 3, invalid keyword: udev_dir
mpatha (360000000000000000e00000000010001) dm-2 IET     ,VIRTUAL-DISK   
! Z' b$ j" D) @; ysize=10G features='0' hwhandler='0' wp=rw
2 |+ o: |7 i4 W+ N, l  C* w4 z`-+- policy='service-time 0' prio=1 status=active
  |- 2:0:0:1 sda 8:0  active ready running
  |- 3:0:0:1 sdb 8:16 active ready running
' Y9 S* ?  `9 X  k  `- 4:0:0:1 sdc 8:32 active ready running
7 o5 v8 D% m% v# U) C7 q" ]) \