DLPX-95481 Add multipath-tools pkg to Delphix appliance

[david-mendez1]

Background

Support AWS FSx with NetApp ONTAP using their iSCSI volumes as block devices for Delphix database storage (domain0). The initial phase of support will be a POV targeted for the Nov 2025 release.

Problem

AWS FSx with NetApp ONTAP support requires the Delphix iSCSI Initiator feature to be enabled in order to consume the NetApp iSCSI volumes. These iSCSI volumes have multiple paths which is a requirement to support AWS FSx. The first step in supporting this is to include the multipath-tools pkg which contains the multipathd service.

Solution

Add multipath-tools to the debian rules.
We don't want the multipathd service automatically running since it's only needed when the iSCSI initiator feature is enabled (currently behind a feature flag).

Testing Done

ab-pre-push: https://selfservice-jenkins.eng-tools-prd.aws.delphixcloud.com/job/appliance-build-orchestrator-pre-push/12196/

Upgrade test is failing probably due to https://perforce.atlassian.net/browse/TOOL-28580

Verify engine has the pkg installed and not running.

root@ip-10-110-202-19:/export/home/delphix# dpkg --list |grep multipath-tool
ii  multipath-tools                                            0.9.4-5ubuntu8                                                                                  amd64        maintain multipath block device access
root@ip-10-110-202-19:/export/home/delphix# systemctl status multipathd
○ multipathd.service - Device-Mapper Multipath Device Controller
     Loaded: loaded (/usr/lib/systemd/system/multipathd.service; disabled; preset: enabled)
     Active: inactive (dead)
TriggeredBy: ○ multipathd.socket
root@ip-10-110-202-19:/export/home/delphix#

Verified service can be started and the conf file exists:

root@ip-10-110-202-19:/export/home/delphix# systemctl status multipathd
● multipathd.service - Device-Mapper Multipath Device Controller
     Loaded: loaded (/usr/lib/systemd/system/multipathd.service; disabled; preset: enabled)
     Active: active (running) since Fri 2025-09-19 20:49:44 UTC; 1s ago
TriggeredBy: ○ multipathd.socket
    Process: 20680 ExecStartPre=/sbin/modprobe dm-multipath (code=exited, status=0/SUCCESS)
   Main PID: 20682 (multipathd)
     Status: "up"
      Tasks: 7
     Memory: 23.7M (peak: 23.9M)
        CPU: 92ms
     CGroup: /system.slice/multipathd.service
             └─20682 /sbin/multipathd -d -s

Sep 19 20:49:44 ip-10-110-202-19 systemd[1]: Starting multipathd.service - Device-Mapper Multipath Device Controller...
Sep 19 20:49:44 ip-10-110-202-19 multipathd[20682]: multipathd v0.9.4: start up
Sep 19 20:49:44 ip-10-110-202-19 multipathd[20682]: reconfigure: setting up paths and maps
Sep 19 20:49:44 ip-10-110-202-19 systemd[1]: Started multipathd.service - Device-Mapper Multipath Device Controller.
root@ip-10-110-202-19:/export/home/delphix# cat /etc/multipath.conf
defaults {
    user_friendly_names yes
}
root@ip-10-110-202-19:/export/home/delphix#