概述

在Azure上配置Pacemaker 集群，有两种方案。

• 第一种是使用Azure fence agent，在机器故障时调用Azure API来重启机器。
• 第二种是引入一台iSCSI目标服务器来作为SBD设备，来提供Fecing服务，提高故障转移效率。

本次部署，我们使用第二种方案，在机器SBDEVICE01上配置SBD设备，共享为NFS集群，ASCS/ERS集群，HANA集群的Pacemaker提供Fecing服务。

安装iSCSI服务器

更新 SLES

sbd01:~ # sudo zypper update

删除冲突包

鉴于targetcli在SLES 12 SP3上的已知问题，我们需要把下面的几个包卸载掉。删除时，如果提示某个包不存在可以忽略：

sbd01:~ # sudo zypper remove lio-utils python-rtslib python-configshell targetcli
Continue? [y/n/...? shows all options] (y): y
(1/2) Removing yast2-iscsi-lio-server-3.2.1-1.23.noarch ..................[done]
(2/2) Removing lio-utils-4.1-15.14.2.x86_64 ..............................[done]

安装iSCSI目标服务器

sbd01:~ # sudo zypper install targetcli-fb dbus-1-python

启用iSCSI目标服务

sbd01:~ # sudo systemctl enable targetcli
Created symlink from /etc/systemd/system/remote-fs.target.wants/targetcli.service to /usr/lib/systemd/system/targetcli.service.
sbd01:~ # sudo systemctl start targetcli
sbd01:~ #

在iSCSI服务器上创建iSCSI设备

每个集群需要一块独立的ISCSI设备，当前系统中有3个集群，所以在第一章的资源部署时，已经为SBDEVICE01这台机器增加了3块数据盘。

集群的SBD设备规划见下表:

查询已挂载数据盘列表

sdc，sdd，sde就是我们创建机器时挂载的3块数据盘。

sbd01:~ # sudo ls -al /dev/disk/azure/scsi1/ | grep sd[c-e]
lrwxrwxrwx 1 root root 12 Apr 27 06:16 lun0 -> ../../../sdc
lrwxrwxrwx 1 root root 12 Apr 27 07:27 lun1 -> ../../../sde
lrwxrwxrwx 1 root root 12 Apr 27 07:27 lun2 -> ../../../sdd

查询磁盘Id

sbd01:~ # sudo ls -l /dev/disk/by-id/scsi-* | grep .*sd[c-e]
lrwxrwxrwx 1 root root 9 Apr 27 07:27 /dev/disk/by-id/scsi-3600224801e868547ba0a1066e30383dc -> ../../sdd
lrwxrwxrwx 1 root root 9 Apr 27 06:16 /dev/disk/by-id/scsi-3600224809d33b3e91f1755c3ce91079b -> ../../sdc
lrwxrwxrwx 1 root root 9 Apr 27 07:27 /dev/disk/by-id/scsi-360022480cfffa84b3bf3f2e7ed4e5264 -> ../../sde

为SAP集群创建backstore

NFS集群

sbd01:~ # sudo targetcli backstores/block create vnfs01 /dev/disk/by-id/scsi-3600224809d33b3e91f1755c3ce91079b
Created block storage object vnfs01 using /dev/disk/by-id/scsi-3600224809d33b3e91f1755c3ce91079b.

sbd01:~ # sudo targetcli iscsi/ create iqn.2006-04.vnfs01.local:vnfs01
Created target iqn.2006-04.vnfs01.local:vnfs01.
Created TPG 1.
Global pref auto_add_default_portal=true
Created default portal listening on all IPs (0.0.0.0), port 3260.

sbd01:~ # sudo targetcli iscsi/iqn.2006-04.vnfs01.local:vnfs01/tpg1/luns/ create /backstores/block/vnfs01
Created LUN 0.

sbd01:~ # sudo targetcli iscsi/iqn.2006-04.vnfs01.local:vnfs01/tpg1/acls/ create iqn.2006-04.nfs01.local:nfs01
Created Node ACL for iqn.2006-04.nfs01.local:nfs01
Created mapped LUN 0.

sbd01:~ # sudo targetcli iscsi/iqn.2006-04.vnfs01.local:vnfs01/tpg1/acls/ create iqn.2006-04.nfs02.local:nfs02
Created Node ACL for iqn.2006-04.nfs02.local:nfs02
Created mapped LUN 0.

ASCS集群

sbd01:~ # sudo targetcli backstores/block create vascs01 /dev/disk/by-id/scsi-3600224801e868547ba0a1066e30383dc
Created block storage object vascs01 using /dev/disk/by-id/scsi-3600224801e868547ba0a1066e30383dc.

sbd01:~ # sudo targetcli iscsi/ create iqn.2006-04.vascs01.local:vascs01
Created target iqn.2006-04.vascs01.local:vascs01.
Created TPG 1.
Global pref auto_add_default_portal=true
Created default portal listening on all IPs (0.0.0.0), port 3260.

sbd01:~ # sudo targetcli iscsi/iqn.2006-04.vascs01.local:vascs01/tpg1/luns/ create /backstores/block/vascs01
Created LUN 0.

sbd01:~ # sudo targetcli iscsi/iqn.2006-04.vascs01.local:vascs01/tpg1/acls/ create iqn.2006-04.ascs01.local:ascs01
Created Node ACL for iqn.2006-04.ascs01.local:ascs01
Created mapped LUN 0.

sbd01:~ # sudo targetcli iscsi/iqn.2006-04.vascs01.local:vascs01/tpg1/acls/ create iqn.2006-04.ascs02.local:ascs02
Created Node ACL for iqn.2006-04.ascs02.local:ascs02
Created mapped LUN 0.

HANA集群

sbd01:~ # sudo targetcli backstores/block create vhana01 /dev/disk/by-id/scsi-360022480cfffa84b3bf3f2e7ed4e5264
Created block storage object vhana01 using /dev/disk/by-id/scsi-360022480cfffa84b3bf3f2e7ed4e5264.

sbd01:~ # sudo targetcli iscsi/ create iqn.2006-04.vhana01.local:vhana01
Created target iqn.2006-04.vhana01.local:vhana01.
Created TPG 1.
Global pref auto_add_default_portal=true
Created default portal listening on all IPs (0.0.0.0), port 3260.

sbd01:~ # sudo targetcli iscsi/iqn.2006-04.vhana01.local:vhana01/tpg1/luns/ create /backstores/block/vhana01
Created LUN 0.

sbd01:~ # sudo targetcli iscsi/iqn.2006-04.vhana01.local:vhana01/tpg1/acls/ create iqn.2006-04.hana01.local:hana01
Created Node ACL for iqn.2006-04.hana01.local:hana01
Created mapped LUN 0.

sbd01:~ # sudo targetcli iscsi/iqn.2006-04.vhana01.local:vhana01/tpg1/acls/ create iqn.2006-04.hana02.local:hana02
Created Node ACL for iqn.2006-04.hana02.local:hana02
Created mapped LUN 0.

保存targetcli配置

sbd01:~ # sudo targetcli saveconfig
Last 10 configs saved in /etc/target/backup.
Configuration saved to /etc/target/saveconfig.json

引用通告

本文所有配置步骤引用自：《Setting up Pacemaker on SUSE Linux Enterprise Server in Azure》