how to deal with Redhat's bad port of libCurl ?

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_ck_
Posts: 89
Joined: 2012/08/10 23:00:35

how to deal with Redhat's bad port of libCurl ?

Post by _ck_ » 2015/08/26 08:15:34

What is the best way to deal with redhat's buggy backport of libCurl into CentOS 7 ?

https://bugs.centos.org/view.php?id=8076

https://bugzilla.redhat.com/show_bug.cgi?id=1130239

It is causing 150ms delay on my machines on every request

Since it is nearly September and they have not fixed it since January, I cannot wait any longer.

I want to be able to switch back to their rpm via yum when they finally get to it, should I just build my own copy and put it into /usr/local ?

aks
Posts: 3020
Joined: 2014/09/20 11:22:14

Re: how to deal with Redhat's bad port of libCurl ?

Post by aks » 2015/08/26 15:55:40

Reading the posted bug reports, it seems the 150ms delay is due to DNS resolution - just don't do that - use the IP?

If I was to do what you are suggesting, then yes, I'm put it all (libraries and binaries) in /usr/local and ALWAYS call it by the full path (i.e.: /usr/local/bin/curl). Then when they fix it you can just remove the installation in /usr/local. Some people have suggested building a "local" RPM so it's easier to erase later, either way it's (almost) the same thing.
If you do this, I suspect it could no longer be supported by this CentOS.

_ck_
Posts: 89
Joined: 2012/08/10 23:00:35

Re: how to deal with Redhat's bad port of libCurl ?

Post by _ck_ » 2015/08/26 16:26:53

Apparently the city-fan repo built the newest curl 7.44 on CentOS7 (RHEL7) but it has several dependencies and installing those dependencies will definitely require PHP to be rebuilt and perhaps other things as well.

http://mirror.city-fan.org/ftp/contrib/ ... Mirroring/

curl libcurl libcurl-devel libssh2 libssh2-devel libcurl7155 libcurl7112 c-ares

really wish Redhat would just patch their source

I guess I could take the 7.29 source from redhat and just do the small patch on that, which in theory would not break anything else.

https://github.com/bagder/curl/commit/d529f388

Wow, it's not six months old, the bug is literally 13 months old. Nothing from redhat. Sheesh.

It's ONE LINE, just one damn line.

So, can anyone help with the steps here:

http://www.rpmfind.net//linux/RPM/cento ... 86_64.html

_ck_
Posts: 89
Joined: 2012/08/10 23:00:35

Re: how to deal with Redhat's bad port of libCurl ?

Post by _ck_ » 2015/08/26 16:55:56

sheesh look at how much worse centos 7 is vs 6

https://bugzilla.redhat.com/show_bug.cgi?id=1218272

Code: Select all

                real            usr           sys
RHEL 7.1
curl    FTP     0m11.610s       0m0.026s      0m0.041s
        HTTP    0m1.551s        0m0.017s      0m0.039s


wget    FTP     0m0.091s        0m0.011s      0m0.040s
        HTTP    0m0.049s        0m0.014s      0m0.031s

RHEL6.4
curl    FTP     0m0.099s        0m0.016s      0m0.031s
        HTTP    0m0.096s        0m0.013s      0m0.042s

wget    FTP     0m0.087s        0m0.007s      0m0.036s
        HTTP    0m0.048s        0m0.008s      0m0.028s

aks
Posts: 3020
Joined: 2014/09/20 11:22:14

Re: how to deal with Redhat's bad port of libCurl ?

Post by aks » 2015/08/26 17:14:47

Yeah, so RH (according to the bug listing posted) *thinks* it *may* have found another regression, that's probably the thing that's holding it up.
Testing is hard, so is patience.
really wish Redhat would just patch their source
Give them shit loads of money and they'll fix your problem quickly.
Apparently the city-fan repo built the newest curl 7.44 on CentOS7 (RHEL7) but it has several dependencies and installing those dependencies will definitely require PHP to be rebuilt and perhaps other things as well.
Yeah, PHP sucks spades and has a bad (IMO) of security problems for many years now.

_ck_
Posts: 89
Joined: 2012/08/10 23:00:35

Re: how to deal with Redhat's bad port of libCurl ?

Post by _ck_ » 2015/08/26 17:18:42

aks wrote:Yeah, PHP sucks spades and has a bad (IMO) of security problems for many years now.
php is more frequently updated and fixed than perhaps any other language

php7 next month will change everything, it will make php faster than many other languages

aks
Posts: 3020
Joined: 2014/09/20 11:22:14

Re: how to deal with Redhat's bad port of libCurl ?

Post by aks » 2015/08/26 17:34:11

php7 next month will change everything, it will make php faster than many other languages
Yeah and it'll still have a shed load of bugs, probably due to it's popularity. I would say these words: "just stop, please!"
:lol:

_ck_
Posts: 89
Joined: 2012/08/10 23:00:35

Re: how to deal with Redhat's bad port of libCurl ?

Post by _ck_ » 2015/08/26 19:52:53

Since it is fixed in curl-7.29.0-22.fc19 is there any chance that fedora rpms can be applied to a centos install?

Looks like they stopped at 27 and that patch actually was a security fix for ssl, etc.
https://lists.fedoraproject.org/piperma ... 47371.html

We are talking about the same base package with eight additional patches:

centos7: curl-7.29.0-19
fedora19: curl-7.29.0-27

curl-7.29.0-27.fc19.x86_64
libcurl-7.29.0-27.fc19.x86_64
libcurl-devel-7.29.0-27.fc19.x86_64

could those two technically be built into rpms and then dropped into centos7 and not need any dependency replacements since they are

Isn't fc19 the same base as centos7 ? (I think they are up to fc21 now)

rpm downloads:
http://mirror.fdcservers.net/fedora/upd ... x86_64.rpm
http://mirror.fdcservers.net/fedora/upd ... x86_64.rpm
http://mirror.fdcservers.net/fedora/upd ... x86_64.rpm

now looking for the srpm

_ck_
Posts: 89
Joined: 2012/08/10 23:00:35

Re: how to deal with Redhat's bad port of libCurl ?

Post by _ck_ » 2015/08/26 20:58:08

Not sure I am crazy enough to try this, but since the packages are isolated and no dependencies are changed, it can be undone

fedora.repo

Code: Select all

[fedora]
name=Fedora $releasever - $basearch
baseurl=http://dl.fedoraproject.org/pub/archive/fedora/linux/updates/19/$basesearch/
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-fedora-19
yum --enablerepo=fedora update curl libcurl libcurl-devel

Code: Select all

Resolving Dependencies
--> Running transaction check
---> Package curl.x86_64 0:7.29.0-19.el7 will be updated
---> Package curl.x86_64 0:7.29.0-27.fc19 will be an update
---> Package libcurl.x86_64 0:7.29.0-19.el7 will be updated
---> Package libcurl.x86_64 0:7.29.0-27.fc19 will be an update
---> Package libcurl-devel.x86_64 0:7.29.0-19.el7 will be updated
---> Package libcurl-devel.x86_64 0:7.29.0-27.fc19 will be an update
--> Finished Dependency Resolution

Dependencies Resolved

================================================================================================================
 Package                      Arch                  Version                         Repository             Size
================================================================================================================
Updating:
 curl                         x86_64                7.29.0-27.fc19                  fedora                262 k
 libcurl                      x86_64                7.29.0-27.fc19                  fedora                213 k
 libcurl-devel                x86_64                7.29.0-27.fc19                  fedora                297 k

Transaction Summary
================================================================================================================
Upgrade  3 Packages

Total download size: 772 k

_ck_
Posts: 89
Joined: 2012/08/10 23:00:35

Re: how to deal with Redhat's bad port of libCurl ?

Post by _ck_ » 2015/08/26 21:37:47

It worked! Looks stable so far, will run tests all week and watch for any errors in logs - since it the same version with just minor patches, I hope for the best...

Check out the before and after on the graphs, change is at 17:00 hours on the graph after the break, on the right

1. dns time drops to 4ms reading from the resolver cache instead of 150-350ms
2. connect time drops from 420ms to 74ms
3. time to first byte drops from 489ms to 143ms
4. download speed improves from 40KB/sec to 65KB/sec
curl-fix.png
curl-fix.png (10.23 KiB) Viewed 6777 times

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