使用iSCSI协议实现Ceph提供块存储

admin

通过配置文件来创建 target
" F6 x6 q5 ]$ E! F" L* R* Ivim /etc/tgt/targets.conf

# Empty targets configuration file -- please see the package
# documentation directory for an example.
7 l" V7 Q; S0 U0 m1 Y- `8 ~* j#
& v/ |# u& Z0 O( Q  J# You can drop individual config snippets into /etc/tgt/conf.d
6 @# t' C" G4 ~0 `2 C; [% B; rinclude /etc/tgt/conf.d/*.conf
& A" a: ^. `' F) ^! e' ~/ F' h<target iqm.2021-7-02.rbd.com:compute01>
. ?" L1 ]( ]/ W7 L; R* Y, T   driver iscsi
* H0 R3 w. q% w% Q+ m) Q6 M  d   bs-type rbd
   backing-store iscsitgtpool/imagerbd1
+ H/ p( E9 |5 ~</target>
8 D; |- A1 Z+ _& F8 T4 i; x
+ o% V) i6 m+ e% w0 q如果有多个就写多个即可：
$ S# s1 N7 w) ]# v7 x, x<target iqm.2021-7-02.rbd.com1:compute01>
# M  E( |* H6 ]1 m' W. s- ~7 [9 c   driver iscsi
' k! o) m* y  V   bs-type rbd
   backing-storerbdrac/imagerbd2
+ A1 x( e; j! Q% q</target>

重启tgtd服务：
5 P* e! ^4 o/ s3 M% I, U$ b1 gsystemctl restart tgtd.service
, }) O' R0 z4 v* s+ y% @4 v% e/ b
% C) X( \% n, ^, _2 Q3、        查看激活的 target
[root@compute01 ~]# tgtadm --lld iscsi --mode target --op show
& P( ?6 N2 O% Z; d/ g2 y

admin

配置多路径：
' N% ?! s' w2 X# yum install -y device-mapper-multipath

# cat > /etc/multipath.conf <<EOF
defaults {
user_friendly_names yes
2 _1 T! t. T5 a9 n/ ^" Z9 Fudev_dir /dev
path_grouping_policy multibus
failback immediate
no_path_retry fail
}
- Z  Y: x7 |* ~% E# @8 g; y( S/ _EOF

0 W, m8 p/ N1 I" G" @0 y设置开机启动：
, s, X) i) Z; w# l; I$ q3 c  n: gsystemctl enable multipathd.service
7 H" R/ a3 T; [systemctl restart multipathd.service
. g+ t7 c- _1 p8 q6 C" W$ d) A
[root@iscsi ~]# multipath -ll
$ U& B; ~- \0 HJul 02 13:47:18 | /etc/multipath.conf line 3, invalid keyword: udev_dir
mpatha (360000000000000000e00000000010001) dm-2 IET     ,VIRTUAL-DISK   
! _4 R$ o0 ]4 e* H" _' k/ F( o4 ^. Jsize=10G features='0' hwhandler='0' wp=rw
' r+ S, h% [; s) F! k' q`-+- policy='service-time 0' prio=1 status=active
  |- 2:0:0:1 sda 8:0  active ready running
+ H9 ~2 ]' I- U/ ^+ ^5 d  |- 3:0:0:1 sdb 8:16 active ready running
  `- 4:0:0:1 sdc 8:32 active ready running

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