yum configure to only download one package at a time

[Rick Stevens]

On 12/17/2015 04:05 PM, Robin Laing wrote:
> Hello,
>
> I am trying to upgrade my system and through our corporate
> firewall/network filters/etc, the bandwidth is limited.  Today while
> doing an upgrade, yum was downloading five packages at a time.
>
> Due to the limits, I was running into a under X bytes for 60 seconds
> restart.
>
> The limit is such that when there are large packages (eclipse) it gets
> stuck restarting each package over and over until it has run out of
> mirrors.
>
> I read through the yum.conf man and I cannot find a way to tell yum to
> only download a single package.
>
> This is on a f20 system and I am trying to get to F23 but I cannot get
> fedup on f20 to work through our corporate firewall and dnf won't play.
>
> I am working on the problem I asked about earlier as this is the first
> time I had a few days to work on this.
>
> fedora-upgrade is the command that I am using.

It's extremely unwise to jump 3 releases (F20 to F23) via upgrades.
For maximum success, do F20->F21, F21->F22, then F22->F23. In fact,
you'd best be served by backing up all your stuff and doing a fresh
install of F23 (there's been a LOT of changes since F20).

Note also that the upgrade sequence will probably have problems since
F20 and F21 are both end-of-lifed and some of the repo mirrors won't
have the content any longer. In fact, the Fedora project itself moves
the content to

	http://archives.fedoraproject.org/pub/archive/fedora/linux/releases

for end-of-life releases.

Now, as far as your slow downloads, you might try doing this as the root
user:

	echo "0" >/proc/sys/net/ipv4/tcp_sack

and see if that improves things (depends on how your firewall behaves).
If it does, you can make it permanent by adding the following line to
either your /etc/sysctl.conf file or create a new
/etc/sysctl.d/10-openuptcp.conf file (depends on how old your setup is)
and put it in there:

	net.ipv4.tcp_sack = 0

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- Rick Stevens, Systems Engineer, AllDigital    ricks at alldigital.com -
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