[CentOS] Upcoming changes to downloading AltArch .iso images

[Anssi Johansson]

Hi, this notice is for those who employ some sort of an automation to
download AltArch (ie. aarch64, armhfp, i386, power9, ppc64, ppc64le)
CentOS 7 .iso/.raw.xz images from mirror.centos.org. Those using a
regular browser to download these images are not particularly affected,
and you can continue to the next message.

Previously, only main architecture .iso image downloads from
mirror.centos.org were redirected to isoredirect.centos.org, which then
displayed the user a list of nearby external mirrors. We will shortly
extend this configuration to cover AltArch image downloads as well, ie.
direct AltArch image downloads from mirror.centos.org will no longer be
possible. mirror.centos.org will still serve .rpm downloads for all
architectures as before.

There are two reasons for the change. First, to save bandwidth from
mirror.centos.org nodes directly managed by the CentOS Project. Most of
these mirror.centos.org hosts are also used for seeding the 600+
external mirrors we have. By directing some of that .iso download
traffic to external mirrors we can offer faster sync speeds for those
external mirrors, and for people downloading individual rpms from
mirror.centos.org. Second, most of those external mirrors offer faster
download speeds to end users than what could be achieved by downloading
from mirror.centos.org, so the users will benefit from this change as well.

The above change will be implemented some time between the releases of
RHEL 7.6 and CentOS 7.6.18xx, so that external mirrors syncing CentOS
7.6.18xx content would not need to fight for bandwidth between AltArch
.iso downloaders.

The other change, which has already been implemented, is related to how
isoredirect.centos.org behaves when accessed with curl or wget. If you
now do a "wget
http://isoredirect.centos.org/altarch/7/isos/i386/CentOS-7-i386-Everything-1804.iso";,
isoredirect will notice that you are trying to download the file and
will redirect the request to the nearest external mirror. If you access
the same URL with a regular browser, you will see a list of nearby
mirrors from which you can pick your favourite mirror. wget will follow
redirects by default, but curl needs a --location switch to follow
redirects. If a filename is not specified, you will get a list of
mirrors regardless of the browser used.

So, combining the effects of the above two changes: If you currently use
some sort of a script that downloads AltArch .iso images from
mirror.centos.org, those requests will soon be served by external
mirrors instead of mirror.centos.org. In the case of wget you will only
see one additional request and you probably don't need to change
anything, but if you use curl, you must add the --location switch to
curl to follow the redirect issued by isoredirect.centos.org. If you
want to eliminate one redirect, you can change mirror.centos.org to
isoredirect.centos.org in your script. The rest of the URL is the same,
ie. /altarch//isos//

As an aside, even though mirror.centos.org nodes are managed by the
CentOS Project, those servers and their hosting are donations from
various organizations. If you think your organization could donate an
additional server to share the load and to give us better geographical
coverage, please see https://wiki.centos.org/Donate

If you have questions regarding this change, please let me know. Thanks!

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[CentOS] Are these instructions meant to be executed on CentOS 1804?

[Turritopsis Dohrnii Teo En Ming]

Good afternoon from Singapore, I came across this Linux Journal article titled 
"DIY: Build a Custom Minimal Linux Distribution from Source", written by Petros 
Koutoupis. Link: 

 
https://www.linuxjournal.com/content/diy-build-custom-minimal-linux-distribution-source
 Are the instructions in this article meant to be executed with ease on CentOS 
1804 or perhaps easier on other Linux distros? Please advise. Thank you.


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[1] https://tdtemcerts.wordpress.com/

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Re: [CentOS] Are these instructions meant to be executed on CentOS 1804?

[Thomas Bendler]

It doesn't matter which host os you use as long as you match the
requirements stated in the article:

"To continue with this tutorial, you'll need to have GCC, make, ncurses,
Perl and grub tools (specifically grub-install) installed on the host
machine."

Kind regards Thomas

Am Mo., 8. Okt. 2018 um 12:18 Uhr schrieb Turritopsis Dohrnii Teo En Ming <
turritopsis.dohr...@teo-en-ming.com>:

> Good afternoon from Singapore, I came across this Linux Journal article
> titled "DIY: Build a Custom Minimal Linux Distribution from Source",
> written by Petros Koutoupis. Link: <
> https://www.linuxjournal.com/content/diy-build-custom-minimal-linux-distribution-source>
>
> https://www.linuxjournal.com/content/diy-build-custom-minimal-linux-distribution-source
> Are the instructions in this article meant to be executed with ease on
> CentOS 1804 or perhaps easier on other Linux distros? Please advise. Thank
> you.
>
>
> ===BEGIN SIGNATURE===
>
> Blogs: Turritopsis Dohrnii Teo En Ming's Academic Qualifications as at 30
> Oct 2017
>
> [1] https://tdtemcerts.wordpress.com/
>
> [2] http://tdtemcerts.blogspot.sg/
>
> [3]
> https://www.scribd.com/user/270125049/Teo-En-Ming
>
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-- 
Linux ... enjoy the ride!
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[CentOS] This weekend, Ohio LinuxFest

[Rich Bowen]

This weekend, CentOS is sponsoring Ohio LinuxFest in Columbus. Please do 
stop by the booth for your CentOS bumper sticker and fridge magnets.


If you have time and expertise, and would like to do a shift or two at 
the table, please indicate your availability here: 
https://docs.google.com/spreadsheets/d/1TqTqaLoswMYzyfvQCnzjkVazlQkP87CCKBS_mtFLXUY/edit?usp=sharing


See you in Columbus!

--Rich

--
Rich Bowen - rbo...@redhat.com
@CentOSProject // @rbowen
859 351 9166
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[CentOS] I can't find grub-install in CENTOS 7 1804

[Turritopsis Dohrnii Teo En Ming]

Good morning from Singapore,

How can I install it? It looks like this grub-install cannot be easily 
installed.


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Turritopsis Dohrnii Teo En Ming's Academic Qualifications as at 30 Oct 2017

[1] https://tdtemcerts.wordpress.com/

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Get Outlook for Android

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Re: [CentOS] I can't find grub-install in CENTOS 7 1804

[James (CentOS ML)]

On 2018-10-08 22:25, Turritopsis Dohrnii Teo En Ming wrote:

Good morning from Singapore,

How can I install it? It looks like this grub-install cannot be easily
installed.


===BEGIN SIGNATURE===

Turritopsis Dohrnii Teo En Ming's Academic Qualifications as at 30 Oct 
2017


[1] https://tdtemcerts.wordpress.com/

[2] http://tdtemcerts.blogspot.sg/

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Have you tried /sbin/grub2-install?  It's installed by grub2-tools.
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Re: [CentOS] I can't find grub-install in CENTOS 7 1804

[Gordon Messmer]

On 10/8/18 7:25 PM, Turritopsis Dohrnii Teo En Ming wrote:

How can I install it? It looks like this grub-install cannot be easily 
installed.



If you're on a BIOS systems, you're looking for "grub2-install". If 
you're on a UEFI system, then you don't need that tool.  The bootloader 
is on a mounted FAT filesystem, and managed with "efibootmgr".


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Re: [CentOS] I can't find grub-install in CENTOS 7 1804

[Eddie G. O'Connor Jr.]

On 10/09/2018 02:01 AM, Gordon Messmer wrote:


On 10/8/18 7:25 PM, Turritopsis Dohrnii Teo En Ming wrote:
How can I install it? It looks like this grub-install cannot be 
easily installed.



If you're on a BIOS systems, you're looking for "grub2-install". If 
you're on a UEFI system, then you don't need that tool.  The 
bootloader is on a mounted FAT filesystem, and managed with "efibootmgr".


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I was always under the impression this was handled during installation? 
(where you're prompted as to where to install the boot-grub-loader file?)



EGO II
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