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Fwd: dm-cache not caching data on 3.18.21-17.el6.x86_64
by Thanos Makatos 08 Mar '16

08 Mar '16

(I've already sent this to centos-devel almost a week ago but didn't get any reply.) I'm evaluating dm-cache on kernels 3.18.21-17.el6.x86_64 (Xen 4) and 2.6.32-573.7.1.el6.x86_64 (KVM). The test I do is a simple sequential read using dd(1). read_promote_adjustment and sequential_threshold have been set to 1 and 0, respectively. For the 2.6.32 kernel, all seems to be working fine, "#usedcacheblocks" correctly reflects the number of cached blocks based on what I'm reading with dd(1) performance is pretty much native SSD performance. However, the same test on the 3.18.21-17.el6.x86_64 kernel results in "#usedcacheblocks" being stuck to "2" and no performance improvement is observed. Any ideas what could be wrong? How can I further debug this? -- Thanos Makatos

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IPv6 on CentOS-6 - IPTables
by James B. Byrne 08 Mar '16

08 Mar '16

It appears likely that within the next two quarters we will be moving off of our IPv4 class C's and onto a single IPv6 /40 for our sites. We have a fairly complex IPTables setup which handles our gateways and internal hosts. My question is just how much effort is involved in moving these rules from IPv4 to IPv6? Are there elements in one that are not available in the other? Are there any fundamental incompatibilites? Does anyone have a good reference to a case history of moving from one to the other? Regards, -- *** e-Mail is NOT a SECURE channel *** Do NOT transmit sensitive data via e-Mail James B. Byrne mailto:ByrneJB@Harte-Lyne.ca Harte & Lyne Limited http://www.harte-lyne.ca 9 Brockley Drive vox: +1 905 561 1241 Hamilton, Ontario fax: +1 905 561 0757 Canada L8E 3C3

1 0

CentOS 7, ctrl-alt-bksp
by m.roth＠5-cent.us 08 Mar '16

08 Mar '16

I've been googling, and looking at the CentOS wiki - which, btw, when I do a full search on "control-alt-backspace", gives me three pages... in Japanese, I think. How do I re-enable userspace restart X? mark

4 6

Strange behaviour of iptables in centos 7
by anax 08 Mar '16

08 Mar '16

Hi strange behaviour of iptables on a centos 7.0 machine: The following rule is in the iptables of said machine: [root@myserver ~]# iptables -L -v -n --line-numbers |grep 175\. 9 9 456 DROP all -- * * 175.44.0.0/16 0.0.0.0/0 [root@myserver ~]# The corresponding enty in /etc/sysconfig/iptables looks like: [root@myserver ~]# grep 175 /etc/sysconfig/iptables -A INPUT -s 175.44.0.0/16 -j DROP [root@myserver ~]# The rule must be there since ages, because it has number 9 out of 76 similar rules. Today, on the same machine (I rechecked it to make sure not to confound machines), I see the following extract of the ftplog: <snip> 175.44.4.127 2915 175.44.26.128 2021 175.44.26.138 1322 175.44.6.186 1290 175.44.24.88 1219 175.44.4.199 1212 </snip> saying that from this IP addresse there have been this many connections to the ftp server on that machine during the last two days, which means that the iptables haven't dropped the connection to the machine. As far as I know, the ftp server is behind the iptables. I also checked to see in man iptables, wheather the IP address is represented correctly. What im I missing? thanks in advance suomi

4 10

Keep the politics out, please?
by Benjamin Smith 08 Mar '16

08 Mar '16

With this post, I run the risk of causing more of the thing that I speak against. I still think it's important to say it. CentOS mailing list is a technical forum. It is not a political forum. Just reading a thread on bitcoins and the entire thread quickly turned into a political thread with people bitching about everything from Chase Bank to the Russians, and that's just crap. Wildly inappropriate. If you don't like Bitcoins, you should just not reply because you aren't going to use the Bitcoin software. This is a forum to discuss CentOS and issue about CentOS, using CentOS, building desirable software on CentOS, and the like. If you want to bitch about Chase bank, go to Reddit.com/r/politics or something where you can weigh in your heartfelt opinions in a forum where you don't just piss off everybody else there. Ben

3 3

Run Now no longer works in Messages Filters of Thunderbird 38.6
by Bernard Lheureux 07 Mar '16

07 Mar '16

Hi all, Since the last update of Thunderbird to 38.6, the button 'Run Now' of the 'Mail Filters' option is no longer effective and appears always grayed in my CentOS 7... Anybody has the same behavior ? -- (°- Bernard Lheureux //\ Linux System Administrator v_/_ MailTo:bernard@lheureux.be

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OpenSSL Update - not a security update???
by Anthony K 07 Mar '16

07 Mar '16

This command output is odd: yum update --security ... No packages needed for security; 118 packages available However, this command says there's an OpenSSL update: yum update openssl ... ---> Package openssl-libs.x86_64 1:1.0.1e-51.el7_2.2 will be updated ---> Package openssl-libs.x86_64 1:1.0.1e-51.el7_2.4 will be an update Why does yum not consider this CESA a security update? Perplexed, ak.

11 20

Latest version of kate editor
by H 07 Mar '16

07 Mar '16

I have installed the kate editor on Centos 6.7 but it seems to be a very old version, 3.3.4, installed as part of kdesdk. On Centos 7 I can simply run 'yum install kate' but, alas, not on Centos 6. What is the recommended way of updating kate on Centos 6? Thank you.

11 36

Re: [CentOS] 6.7 netinstall fails at insert cd to continue
by Richard 07 Mar '16

07 Mar '16

> Date: Sunday, March 06, 2016 22:25:55 -0600 > From: g <geleem(a)bellsouth.net> > > On 03/06/16 22:15, Richard wrote: > <<>> > >> "shell" is a yum command, invoked as shown below. I don't believe >> there is any program called "yum-shell" (even though that is the >> man page reference). >> >> shell Is used to enter the 'yum shell', when a filename is >> specified the contents of that file is executed in >> yum shell mode. See yum-shell(8) for more info. >> >> SYNOPSIS >> yum shell [filename] >> >> The contents of the file need to be standard yum-acceptable lines. >> I.e., the lines of a package list would need to be edited to >> include "install " and/or input continuation characters, etc. >> > -- > > ok. so how about; > > yum shell install < pkginstalllist.file I suspect not. However, yum shell pkginstalllist.file where you have prepended "install " to each line (and I believe added "run" at the end) of that file would seem to be likely to work. A simple vi or perl search/replace edit/one-line script should get you the input file you need. Since you have an interest in this I'll let you read the man page and do the experimenting.

1 0

C-Media CM8828 [CentOS 7]
by Alice Wonder 07 Mar '16

07 Mar '16

Basically I will be needing a low profile PCIe sound card with optical out. There isn't a hell of a lot of selection, seems the assumption is if you need sound it is on the motherboard. That one has PCIe and a low profile bracket, but it uses the C-Media CM8828 chipset. My understanding that chipset is only supported in 3.17+ kernels, CentOS 7 uses 3.10.x A) By any chance, has the been back-ported in CentOS kernel? B) If not, does anyone know of a 3rd party repo that has it as a kernel module built against CentOS kernel? I suspect B is no because it looks like the patches were to ALSA driver itself and not a new module. I'd prefer not to have to run a custom kernel because of updates. Anyone know the status of that chipset in CentOS 7?

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