# RKE kernel requirements (CentOS)

**URL:** <https://forums.suse.com/t/rke-kernel-requirements-centos/12074>\
**Category:** SUSE Rancher Prime\
**Created:** [October 18, 2018, 12:44pm UTC](https://forums.suse.com/t/rke-kernel-requirements-centos/12074 "2018-10-18T12:44:57Z")\
**Posts on this page:** 8\
**Page:** 1

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**Author:** ![davenport](https://sea2.discourse-cdn.com/flex022/user_avatar/forums.suse.com/davenport/32/2351_2.png) [@davenport](https://forums.suse.com/u/davenport)\
**Post date:** [October 18, 2018, 12:44pm UTC](https://forums.suse.com/t/rke-kernel-requirements-centos/12074/1 "2018-10-18T12:44:57Z")

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Greetings,

The documented RKE kernel requirements include x\_tables, xt\_recent and xt\_tcpudp

We are using a current version of Centos 7:

cat /etc/redhat-release  
CentOS Linux release 7.5.1804 (Core)

uname -r  
3.10.0-862.14.4.el7.x86\_64

lsmod does not include x\_tables, xt\_recent and xt\_tcpudp

Are these required and if so then any suggestions on how to install them?

Thanks,

Doug

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**Author:** ![davenport](https://sea2.discourse-cdn.com/flex022/user_avatar/forums.suse.com/davenport/32/2351_2.png) [@davenport](https://forums.suse.com/u/davenport)\
**Post date:** [October 30, 2018, 6:13pm UTC](https://forums.suse.com/t/rke-kernel-requirements-centos/12074/2 "2018-10-30T18:13:56Z")

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Was able to load xt\_recent.

Where do I find or how do I load x\_tables and xt\_tcpudp ?

Are they needed?

Please help.

Thanks,

Doug

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**Author:** ![Stonedge](https://avatars.discourse-cdn.com/v4/letter/s/d07c76/32.png) [@Stonedge](https://forums.suse.com/u/Stonedge)\
**Post date:** [October 30, 2018, 8:57pm UTC](https://forums.suse.com/t/rke-kernel-requirements-centos/12074/3 "2018-10-30T20:57:21Z")

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I’m not an expert at all (i’m only sharing my experience)…I’ve used rke over recent minimal centos install to build an rancher ha cluster without any issue(without adding any kernel module)… is it possible that those kernel module was required over centos 6 only?

Stonedge

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**Author:** ![davenport](https://sea2.discourse-cdn.com/flex022/user_avatar/forums.suse.com/davenport/32/2351_2.png) [@davenport](https://forums.suse.com/u/davenport)\
**Post date:** [October 30, 2018, 9:52pm UTC](https://forums.suse.com/t/rke-kernel-requirements-centos/12074/4 "2018-10-30T21:52:45Z")

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@Stonedge, thanks for the feedback, that has been my limited experience as well. I’m hoping the RKE experts weigh in on this and explain the requirements and how to fulfill them. Is CentOS not supported?

Thanks again,

Doug

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**Author:** ![superseb](https://sea2.discourse-cdn.com/flex022/user_avatar/forums.suse.com/superseb/32/2424_2.png) [@superseb](https://forums.suse.com/u/superseb)\
**Post date:** [November 2, 2018, 2:16pm UTC](https://forums.suse.com/t/rke-kernel-requirements-centos/12074/5 "2018-11-02T14:16:31Z")

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It won’t show in `lsmod` if it’s builtin, you can try `grep module_name /lib/modules/$(uname -r)/modules.builtin`

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**Author:** ![davenport](https://sea2.discourse-cdn.com/flex022/user_avatar/forums.suse.com/davenport/32/2351_2.png) [@davenport](https://forums.suse.com/u/davenport)\
**Post date:** [November 8, 2018, 5:12pm UTC](https://forums.suse.com/t/rke-kernel-requirements-centos/12074/6 "2018-11-08T17:12:59Z")

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@superseb thanks for that tidbit - would be useful documentation update

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**Author:** ![runswithd6s](https://sea2.discourse-cdn.com/flex022/user_avatar/forums.suse.com/runswithd6s/32/4816_2.png) [@runswithd6s](https://forums.suse.com/u/runswithd6s)\
**Post date:** [March 28, 2019, 6:27pm UTC](https://forums.suse.com/t/rke-kernel-requirements-centos/12074/7 "2019-03-28T18:27:24Z")

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This is a very useful thread! Thank you! Nice suggestion @superseb. Saved me a lot more googling!

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**Author:** ![kamlesh](https://avatars.discourse-cdn.com/v4/letter/k/aeb1de/32.png) [@kamlesh](https://forums.suse.com/u/kamlesh)\
**Post date:** [October 18, 2019, 10:22am UTC](https://forums.suse.com/t/rke-kernel-requirements-centos/12074/8 "2019-10-18T10:22:06Z")

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> [@davenport](#):
>
> xt\_tcpudp

hey superseb…thanks for the command, i am able to locate two of the modules i.e. xt\_tcpudp, x\_tables but xt\_recent module is not present. do u know how to get install this (xt\_recent) module?