Red Hat Satellite engineering is moving the tracking of its product development work on Satellite to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "Satellite project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs will be migrated starting at the end of May. If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "Satellite project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/SAT-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.
Bug 2139418 - MQTT ReX mode makes it too easy to to DDOS Satellite
Summary: MQTT ReX mode makes it too easy to to DDOS Satellite
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Satellite
Classification: Red Hat
Component: Remote Execution
Version: 6.12.0
Hardware: Unspecified
OS: Unspecified
high
high
Target Milestone: 6.13.0
Assignee: satellite6-bugs
QA Contact: Peter Ondrejka
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2022-11-02 13:25 UTC by Jan Hutař
Modified: 2023-05-03 13:22 UTC (History)
3 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2023-05-03 13:22:26 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Issue Tracker SAT-13864 0 None None None 2022-11-14 12:02:04 UTC
Red Hat Product Errata RHSA-2023:2097 0 None None None 2023-05-03 13:22:33 UTC

Description Jan Hutař 2022-11-02 13:25:02 UTC 
Description of problem:
Having Satellite with MQTT ReX mode and 3k clients, I can not run ReX on all of them in one go as before.


Version-Release number of selected component (if applicable):
satellite-6.12.0-4.el8sat.noarch


How reproducible:
always


Steps to Reproduce:
1. Configure Sat with `satellite-installer --foreman-proxy-plugin-remote-execution-script-mode=pull-mqtt` (in my case I also used "--tuning=medium --foreman-foreman-service-puma-threads-min=16 --foreman-foreman-service-puma-threads-max=16 --foreman-foreman-service-puma-workers=8 --foreman-db-pool=128 --foreman-proxy-plugin-remote-execution-script-install-key=true")
2. Ran a "Command" ReX on 3000 hosts with:
       subscription-manager refresh
       yum -y install insights-client
       insights-client --register


Actual results:
Log proxy.log has a bunch of SSL errors:

2022-11-02T09:04:25  [E] <OpenSSL::SSL::SSLError> SSL_accept SYSCALL returned=5 errno=0 state=TLSv1.3 early data
        /usr/share/ruby/webrick/server.rb:299:in `accept'
        /usr/share/ruby/webrick/server.rb:299:in `block (2 levels) in start_thread'
        /usr/share/ruby/webrick/utils.rb:263:in `timeout'
        /usr/share/ruby/webrick/server.rb:297:in `block in start_thread'

The client wasn't able to retrieve the job:

Nov 02 09:04:25 f09-h26-b02-5039ms-container100.red.ddns.perf.redhat.com yggdrasild[647]: [yggdrasild] 2022/11/02 09:04:25 cannot get detached message content: cannot download from URL: Get "https://f09-h26-b01-5039ms.rdu2.scalelab.redhat.com:9090/ssh/jobs/88e7dae2-3998-4366-b9e5-aa4216e0030f": net/http: TLS handshake timeout

=> ReX job got stuck after 879 succeeded tasks, with 2121 pending.


Expected results:
We either need to decide on documenting max allowed number of hosts one capsule with MQTT can handle, or providing a way how to limit concurrency when running the host.

FYI as of now, default tuning is documented to be able to handle 5k hosts.


Additional info:
Thanks aruzicka for investigating this!

When I switched to SSH mode with `satellite-installer --foreman-proxy-plugin-remote-execution-script-mode=ssh` and re-ran the job (after cancelling sub-tasks from previous one), 2991 succeeded, only 9 failed.

I do not mark this as a regression, because IIRC MQTT is optional.
Comment 5 Peter Ondrejka 2023-03-01 14:17:42 UTC 
Verified on Sat 6.13 snap 12, the mqtt_rate_limit parameter has been added and is applied as expected.
Comment 8 errata-xmlrpc 2023-05-03 13:22:26 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (Important: Satellite 6.13 Release), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2023:2097
Note You need to log in before you can comment on or make changes to this bug.