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Status Future consideration
Workspace IBM i
Created by Guest
Created on Mar 20, 2019

Add subsystem support to SSHD attributes

In order to isolate SSH jobs in their own subsystem, you must use the instructions documented in this article:
http://www-01.ibm.com/support/docview.wss?uid=nas8N1014744

However, this requires that you start the SSHD with the /QOpenSys/usr/sbin/sshd command and cannot use the STRTCPSVR *SSHD command. STRTCPSVR *SSHD always starts SSH in the QUSRWRK subsystem.

Support should be added, probably as an SSH property/attribute, to specify the subsystem in which the SSH jobs should run. This could be similar to how FTP and SMTP allow the subsystem to be configured.


Use Case:

I have a system with interactive users (5250), as well as many users that access the system with SSH. In addition, I have the database servers. I want to isolate each type of work into their own subsystem for improved management and control of the workloads. I can easily do this for all servers expect SSH, since STRTCPSVR for SSH will always start the daemon in QUSRWRK.


Idea priority Medium
  • Guest
    Sep 24, 2019

    The CAAC has reviewed this requirement and recommends that IBM view this as a medium priority requirement that should be addressed. The ability to view this type of work in its own subsystem would give performance benefits and manageability for things that are often interactive in nature from remote connections.

    Background: The COMMON Americas Advisory Council (CAAC) members have a broad range of experience in working with small and medium-sized IBM i customers. CAAC has a key role in working with IBM i development to help assess the value and impact of individual RFEs on the broader IBM i community, and has therefore reviewed your RFE.

    For more information about CAAC, see www.common.org/caac

    For more details about CAAC's role with RFEs, see http://www.ibmsystemsmag.com/Blogs/i-Can/May-2017/COMMON-Americas-Advisory-Council-%28CAAC%29-and-RFEs/

    Nancy Uthke-Schmucki - CAAC Program Manager

  • Guest
    Aug 6, 2019

    The COMMON Europe Advisory Council (CEAC) has reviewed this requirement and recommends that IBM view this as a medium priority requirement that should be addressed.

    Background: The CEAC members have a broad range of experience in working with small and medium-sized IBM i customers. CEAC has a crucial role in working with IBM i development to help assess the value and impact of individual RFEs on the broader IBM i community and has therefore reviewed your RFE.

    To find out how CEAC help to shape the future of IBM i, see CEAC @ ibm.biz/BdYSYj and the article "The Five Hottest IBM i RFEs Of The Quarter" at ibm.biz/BdYSZT

    Therese Eaton – CEAC Program Manager, IBM

  • Guest
    Jul 8, 2019

    Hi Dawn

    I think this is a good RFE candidate, as the SSH port is now a key part of an IBM i system that makes uses of Open Source. As such being able to control the subsystem in runs in is a key component of system administration and of course performance management.

    I believe I may have a workaround for you based on the way we used to have to start the SSH Deamon back a v5.x. This still seems to work and I have in products on a 7.3 server that was migrated from 5.4 to 7.1, then 7.2 & no 7.3.

    From the system startup program, I start the SSH subsystem, which has a JOBQ called SSH linked to it, then submit a job to it.

    STRSBS SSH
    SBMJOB CMD(CALL PGM(QP2SHELL) PARM('/QOpenSys/usr/sbin/sshd')) jobq(ssh) job(str_sshd)

    Your mileage may vary and let me end as I started, I would like to see a formal IBM i way of doing this.

    Best wishes, Steve B