Discuss May 2016

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155 participants
149 discussions

CentOS 7 and 4K display
by Jerry Geis 07 May '16

07 May '16

I installed C7 along with MATE desktop... My monitor is a 4K unit but when I goto the System -> preferences -> hardware -> Displays there is selection for the 4K display. It stops at 1920x1080. The var log x file shows the 4K resolutions in the file so that is good. How do I get the selections for 4K to show up? Thanks, Jerry

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Re: [CentOS] resize lvm
by Wes James 07 May '16

07 May '16

> > From: Scott Robbins <scottro11(a)gmail.com> > Date: May 06, 2016 12:32:55 PM > To: CentOS mailing list <centos(a)centos.org> > Subject: Re: [CentOS] resize lvm > > On Fri, May 06, 2016 at 06:19:35PM +0000, Wes James wrote: > > I have a laptop that I put centos 7 on and I started out with a 30gig partition. I resized the other part of the disk to allow more space for centos. I then created an unformated partition in the available space, ran > > > > pvcreate /dev/sda4 > > > > > vgextend lvname /dev/sda4 > > > > > lvextend -L 184.46G /dev/lvname/root > > > > I find it easiest to do lvextend -l 100%VG /dev/lvname/rootI find it > easiest to do lvextend -l 100%VG /dev/lvname/root. > (Then, if practical, and since it's a laptop, I'm guessing it's not a > production machine), reboot from a livecd or whatever and doing e2fsk -f > /dev/lvmname/root > > I don't know if it will solve your issue, but may be worth trying. I found this: # lvextend -l +100%FREE /dev/myvg/testlv doing a search. What's the difference between 100%VG and 100%FREE? Thanks, -wes

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Re: [CentOS] resize lvm
by Wes James 07 May '16

07 May '16

On May 06, 2016, at 12:29 PM, John R Pierce <pierce(a)hogranch.com> wrote: On 5/6/2016 11:19 AM, Wes James wrote: sudo resize2fs /dev/lvname/root I get: resize2fs: Bad magic number in super-block while trying to open /dev/lvname/root Couldn't find valid filesystem superblock. what file system type is this /dev/lvname/root ? I tried to find the type from blkid /dev/sda4 but that didn't give me the info so I tried file -s /dev/dm-0 and it says XFS So would I use xfs_growfs? -- john r pierce, recycling bits in santa cruz _______________________________________________ CentOS mailing list CentOS(a)centos.org https://lists.centos.org/mailman/listinfo/centos

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centos samba sssd active directory
by Stefan Fuhrmann 07 May '16

07 May '16

Hello all, Im having the latest centos that should be integrated into win 2012 active directory domain. Im having Authentication running, an AD user can login via ssh, getent and id working But Im not able to get the samba shares running with AD [sfu-erp] comment = Mandant path = /share # ; valid users = @"RZ-DOMAIN\linuxtest" @"RZ-DOMAIN\linuxtest" valid users = DOMAIN # valid users = @"RZ-DOMAIN+domänen-benutzer" # valid users = @"RZ-DOMAIN" #valid users = %S, RDOMAIN\%S #valid users = @DOMAIN #valid users = linuxtest # force user = fuhste # guest ok = yes # force group = @"RZ-DOMAIN+domänen-benutzer" # force group = @"RZ-ODOMAIN" # ; force group = domänen-benutzer force create mode = 0660 force directory mode = 0770 readonly = no writeable = yes As you can see Itried a lot with valid users with no success. Im trying some days now but Im not able to get it running. Need more information? Can someone help? Tia Stefan

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ImageMagick security alert
by Alice Wonder 07 May '16

07 May '16

https://imagetragick.com/ As CentOS is often used for web servers, I thought this should be posted here. Bug in ImageMagick allows remote exploit. AFAIK no patch exists yet but defense against the exploit is detailed at the link. CVE-2016–3714

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Re: [CentOS] resize lvm
by Wes James 06 May '16

06 May '16

On May 06, 2016, at 12:37 PM, John R Pierce <pierce(a)hogranch.com> wrote: On 5/6/2016 11:28 AM, John R Pierce wrote: On 5/6/2016 11:19 AM, Wes James wrote: sudo resize2fs /dev/lvname/root I get: resize2fs: Bad magic number in super-block while trying to open /dev/lvname/root Couldn't find valid filesystem superblock. what file system type is this /dev/lvname/root ? oops, left out the rest... since you said C7, its quite likely its XFS not extXfs ... if thats the case, then use: xfs_growfs /dev/lvname/root Thanks for the tip. I looked at man xfs_growfs and found -d option and so I used this and it worked: sudo xfs_growfs / -d -- john r pierce, recycling bits in santa cruz _______________________________________________ CentOS mailing list CentOS(a)centos.org https://lists.centos.org/mailman/listinfo/centos Thanks! -wes

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resize lvm
by Wes James 06 May '16

06 May '16

I have a laptop that I put centos 7 on and I started out with a 30gig partition. I resized the other part of the disk to allow more space for centos. I then created an unformated partition in the available space, ran pvcreate /dev/sda4 vgextend lvname /dev/sda4 lvextend -L 184.46G /dev/lvname/root but when I run: sudo resize2fs /dev/lvname/root I get: resize2fs: Bad magic number in super-block while trying to open /dev/lvname/root Couldn't find valid filesystem superblock. How do I resize the volume? Thanks, -wes

4 4

[off-topic] Validating e-mail address with php
by Alice Wonder 06 May '16

06 May '16

After running into several web application that rejected any e-mail address on the new gTLDs because the apps were badly written to validate with a hard-coded list of valid TLDs, I wrote a e-mail validation function that I *think* does things properly. Free for anyone to use who wants to. https://deviant.email/emailaddytest.phps What it really does is use the PHP built-in filter_var but it compensates for known bugs in the filter_var e-mail address validation. It return boolean. I *think* it will properly validate any legal routable address and reject any that are not. But bugs may exist. By default when the host part of user@host is a domain name, it does a DNS query to validate the host resolves. That adds a little latency but I think is worth it. My own implementation will probably cache a positive result for up to 24 hours with APCu but that's not in the function linked. The dns lookup can be disabled. By default it will reject IP address as the host part, but that can be enabled. When enabled, it will reject private and reserved range. Well, reject what is hard-coded into PHP filter_var - I haven't tested that. International domain names will only validate if the php-intl functions are installed (to turn them into punycode) -=- For the username validation, that's where any bugs are most likely to exist. But I think I did it right. It's very unfortunate that the built-in php filter doesn't do it right. Anyway free for anyone, I'm tired of e-mail address filters that don't properly work with common user names on perfectly legal domains that just happen to be newly ICANN approved. You can see live testing by just removing the last s from the filename.

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yum update (first in a long time) - /var/log/dovecot no longer used
by Gary Stainburn 06 May '16

06 May '16

Me again, Another change to my Centos 7.2 system since my 'yum update' yesterday is that /var/log/dovecot is no longer written to. If I do 'systemctl status dovecot' I can see log entries. How can I now do the equiv or 'tail -f <logfile>' Also, why has this changed, and where is it documented?

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Re: [CentOS] yum update (first in a long time) - /var/log/dovecot no longer used
by James B. Byrne 06 May '16

06 May '16

On Fri, May 6, 2016 04:36, John Hodrien wrote: > On Fri, 6 May 2016, Gary Stainburn wrote: > >> What I didn't expect, and what really threw me was that this has >> been implemented via a simply 'yum update' of an existing system, >> not at a major release level. > > > Something like RHEL is stuck in a trap here. Either they never > change a default post-install (lots of rpmnew or deliberately > not introducing new behaviours), or they bring in defaults as > you update (to some extent doing things like rpmsave). Some > people would complain whichever option they chose. Or have packagers divide configuration files into system and local with local overriding system. Then restrict software updates such that they modify only system configs leaving locals alone. That way new things can be added with old things are left as they are. Some software already behaves like this. There is no evident technical reason why most of the rest could not as well. If an update is such that old things cannot be left alone then that is sufficient to require an rpmnew and a warning to the installer that manual intervention is required to complete the update. In fact, anything of that nature would benefit from requiring a special switch to install so that 'yum update' would not break a running system. -- *** e-Mail is NOT a SECURE channel *** Do NOT transmit sensitive data via e-Mail Do NOT open attachments nor follow links sent by 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

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Discuss May 2016