Discuss April 2016

discuss@lists.centos.org

150 participants
130 discussions

Bonding wired and wireless ifaces
by wwp 01 May '16

01 May '16

Hello all, I'm wondering if there's any interest in trying to bond em1 and eth0 (respectively wired and wireless interfaces here), and if any, how to do it in CentOS6. I've found this, which could possibly help (but I'm failing yet): http://r.outlyer.net/linux:bonding https://help.ubuntu.com/community/UbuntuBonding Both are dealing w/ ifenslave. Any experience or point of view on this topic? For now, and without any change to the CentOS network config, I have my wired and wireless ifaces up at the same time, same IP (thanks for the DHCP config running on my router), but apparently only the wired one is taking into account in the routing table (if I understand), until I undock the laptop and run on the wireless one): > route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 10.0.2.0 0.0.0.0 255.255.255.0 U 1 0 0 em1 <- wired 10.0.2.0 0.0.0.0 255.255.255.0 U 2 0 0 eth0 <- wireless 0.0.0.0 10.0.2.1 0.0.0.0 UG 0 0 0 em1 <- 10.0.2.1 is my router I'm a complete newbie to bonding, so please forgive any non-sense I could have written here! Regards, -- wwp

2 2

Re: [CentOS] E-mail advice sought
by Richard 30 Apr '16

30 Apr '16

------------ Original Message ------------ > Date: Saturday, April 30, 2016 11:28:23 -0700 > From: Alice Wonder <alice(a)domblogger.net> > > I'm working on setting up an e-mail service. > > I've got the e-mail servers working beautifully and am presently > working on re-writing the parts of Roundcube I don't like (e.g. it > uses inline JavaScript in a few places so CSP breaks it) but - > > Is there any advice on characters to allow in usernames? > > I know there are some wacky characters that are legal in e-mail > addresses but are generally frowned upon - like > > "very.(),:;<>[]\".VERY.\"very@\ \"very\".unusual"@example.com > > is apparently a legal address - but I know I don't want to allow > ampersands and brackets etc. in an address. > > I don't think a whitelist alphabet is best approach because of > people with names that are not spelled with Latin characters. > > Is there an existing blacklist of characters that technically legal > but are generally avoided in e-mail addresses? > You should avoid straying from the mail standards (as defined in the IETF RFCs). If you do stray your users will encounter arbitrary/seemingly random failures that will waste everyones time to debug. The wikipedia page: <https://en.wikipedia.org/wiki/Email_address> gives a good summary -- look at the "local part" section and the examples lower down. You'll also want to review the RFCs. Depending on your user community you may also need to look at the RFCs related to the internationalization of email addressing sooner rather than later. Note, that wiki page has some references to non-RFC sources that are basically the authors' views/preferences. In at least one of these cases, many of the recommendations violate the RFCs. If there is doubt, the RFCs should be your guide.

1 0

tune2fs: Filesystem has unsupported feature(s) while trying to open
by Matt Garman 30 Apr '16

30 Apr '16

I have an ext4 filesystem for which I'm trying to use "tune2fs -l". Here is the listing of the filesystem from the "mount" command: # mount | grep share /dev/mapper/VolGroup_Share-LogVol_Share on /share type ext4 (rw,noatime,nodiratime,usrjquota=aquota.user,jqfmt=vfsv0,data=writeback,nobh,barrier=0) When I try to run "tune2fs" on it, I get the following error: # tune2fs -l /dev/mapper/VolGroup_Share-LogVol_Share tune2fs 1.41.12 (17-May-2010) tune2fs: Filesystem has unsupported feature(s) while trying to open /dev/mapper/VolGroup_Share-LogVol_Share Couldn't find valid filesystem superblock. This filesystem was created on this system (i.e. not imported from another system). I have other ext4 filesystems on this server, and they all work with "tune2fs -l". Basic system info: # rpm -qf `which tune2fs` e2fsprogs-1.41.12-18.el6.x86_64 # cat /etc/redhat-release CentOS release 6.5 (Final) # uname -a Linux lnxutil8 2.6.32-504.12.2.el6.x86_64 #1 SMP Wed Mar 11 22:03:14 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux I did a little web searching on this, most of the hits were for much older systems, where (for example) the e2fsprogs only supported up to ext3, but the user had an ext4 filesystem. Obviously that's not the case here. In other words, the filesystem was created with the mkfs.ext4 binary from the same e2fsprogs package as the tune2fs binary I'm trying to use. Anyone ever seen anything like this? Thanks!

8 12

new firefox upgrade, then crash
by ken 30 Apr '16

30 Apr '16

Earlier today I upgrade firefox, closed the old version, opened the new, and first it froze-- displayed a message about a script running and asking me if I wanted to stop it; I said no to let it run-- then it crashed and disappeared. # ps -ef|grep firefox root 3150 4904 0 14:08 pts/2 00:00:00 grep --color=auto firefox # uname -r 3.10.0-327.10.1.el7.x86_64 # cat /etc/centos-release CentOS Linux release 7.2.1511 (Core)

4 3

Semi-OT: awk
by m.roth＠5-cent.us 30 Apr '16

30 Apr '16

This is odd, and annoying. CentOS 6, current. Here's my awk script: { room = substr($0, 48, 10); arr[$2,room,$1] = $0; } END { for ( i in arr ) { for ( j in arr[i] ) { for ( k in arr[i][j] ) { print arr[i][j][k]; } } } } And when I run it, it complains awk -f awksort proplist7 awk: awksort:7: for ( j in arr[i] ) { awk: awksort:7: ^ syntax error awk: awksort:8: for ( k in arr[i,j] ) { awk: awksort:8: ^ syntax error awk: awksort:9: print arr[i][j][k]; awk: awksort:9: ^ syntax error which makes no sense - I've done this a million times. Am I missing something, or is this a bug? mark

3 2

C5: The Firefox ESR 45.1.0 Nighmare
by Always Learning 29 Apr '16

29 Apr '16

Centos replaced well-running customise Firefox with version ESR 45.1.0 * All the add-ons (language dictionaries, Adblock Plus, Classic Theme Restorer etc.) were disabled with no simple method of reactivating them. Reason given was they were "unsigned". * About:config xpinstall.signatures.required = false partially reduced the problem. * Then possible to reactivate some disabled add-ons, but others down-loaded OK but would not install * removing files in ~/.mozilla/firefox/.../extensions.* and restarting was supposed to help However the time-wasting problem remains, so too do the down-loaded extensions in /tmp, example tmp-xxx.xpi Would be really nice if Centos warned its loyal and grateful users of possible problems before those users trustingly replaced working programmes with considerable time-wasting problems. Time spent on trying to return Firefox to a useful and dependable working tool is unavailable for other tasks :-( -- Regards, Paul. England, EU. England's place is in the European Union.

9 14

OT, security: if you're in the US, and like your dentist, call them, *now*
by m.roth＠5-cent.us 29 Apr '16

29 Apr '16

If you like your dentist, *call* them, today. <http://krebsonsecurity.com/2016/04/dental-assn-mails-malware-to-members/>, and the URL says it all - they mailed a card with a USB key... and some of them have malware, and Krebs says not all virus scanners can detect it.... mark "got off the phone with my dentists' office a few minutes ago

1 0

Firefox 46.0 fails on CentOS 6.7 due to GTK3 requirement
by Phelps, Matthew 29 Apr '16

29 Apr '16

The latest version of firefox, 46.0 requires GTK3 and so it fails on CentOS 6.7. I know there is the ESR release supplied by upstream, but that is based on version 38. We have regularly installed the Mozilla "Linux" version of Firefox in a central location for our users, and this has worked just fine until 46.0. (I note from https://www.mozilla.org/en-US/firefox/organizations/faq/ that even that ESR release is due to stop being supported soon). I filed a bugzilla report at https://bugzilla.mozilla.org/show_bug.cgi?id=1267815. If this matters to you, please consider tagging onto that bug. Yes, yes we have to upgrade to CentOS 7. But in our shop, the amount of work required to get this done is huge, and won't happen soon. The whole idea of using RHEL/CentOS is to have a stable, supported version for a long period of time. How can we do this if even a web browser won't work? -- Matt Phelps System Administrator, Computation Facility Harvard - Smithsonian Center for Astrophysics mphelps(a)cfa.harvard.edu, http://www.cfa.harvard.edu

5 8

Where can I find the CentOS gpg keys?
by Albin Otterhäll 29 Apr '16

29 Apr '16

Hi! I'm currently using a non-CentOS system, and wondering where I can find the GPG keys so I can verify the checksum file? The page on the website (https://www.centos.org/keys/) only give information where I can find them on an already installed system. Regards, Albin

5 6

Centos hold me back from work - sshd ...bull
by Andreas Benzler 28 Apr '16

28 Apr '16

I don’t know what’s going on the sushi from the laptop always kick me out!!! Fresh installation. packet_write_wait: Connection How can that be! Andy

6 8

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

2006

2005

2004

Discuss April 2016