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Extending a CentOS disk without reboot
by Sander Kuusemets 07 Jan '16

07 Jan '16

Hello, Today a virtual server under my administration ran out of disk space, so I had to get extra space to it.. while it was running, because it's an important web server without any kind of HA/Load Balancing (don't do that, kids). So what happened, is that after another administrator had extended the disk from VMWare, I tried to extend it from the OS side. Everything went well, listing my steps here: * echo 1 > /sys/class/scsi_device/2\:0\:0\:0/device/rescan * fdisk /dev/sdb (the usual, delete partition and make a new, bigger one) Now's when the problems happened. After writing the partition table I got the usual "Busy" error. But I needed to do this without downtime. So, what did I try to get the kernel acknowledge the partition size change: * hdparm -z /dev/sdb * partx -a -v /dev/sdb * partprobe -s * echo "1" > /sys/block/sdb/device/rescan And while dmesg reported that it recognized the partition change, LVM did still not see it. So eventually, I was still forced to reboot, after which everything (pvresize, lvresize, resize2fs) worked fine. Environment: * A VMWare virtual machine * CentOS 6.7 (Final) Is there any other way I'm missing? Is this caused by the fact that I was trying to resize a partition that is under the root file system? If so, then is it really impossible to do it live? Thanks, -- Sander Kuusemets University of Tartu, High Performance Computing, IT Specialist

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systemd-sysctl not running on boot
by Ofer Hasson 06 Jan '16

06 Jan '16

Hey all, After upgrading to CentOS 7.2, non of my servers run systemd-sysctl on boot. So far, I tried running manually /usr/lib/systemd/systemd-sysctl, it runs smoothly and updates all the parameters. I also ran sysctl --system, which also executes successfully. I checked within systemd, and systemd-sysctl is wanted by the sysinit.target which is wanted by the multi-user.target - the one I boot into. I can't find anything by doing journalctl | grep sysctl Or by looking through /var/log/messages (I run rsyslog as well). Any idea's ? Thanks

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Bind fails to start after update from 7.1 to 7.2
by Emmett Culley 06 Jan '16

06 Jan '16

I am seeing these lines for each domain in the systemd journal: zone relationship123.com/IN: loading from master file relationship123.com.db failed: file not found zone relationship123.com/IN: not loaded due to errors. _default/relationship123.com./IN: file not found If I change the zone defs to include the full path: >From zone "relationships123.com." IN { type master; file "relationships123.com.db"; }; To zone "relationships123.com." IN { type master; file "/var/named/chroot/var/named/relationships123.com.db"; }; in the config file, named starts, but then fails to provide DNS replies with the following error for each request: general: error: zone relationships123.com/IN: loading from master file /var/named/chroot/var/named/relationships123.com.db failed: file not found general: error: zone relationships123.com/IN: not loaded due to errors. Nothing was changed in the named configuration prior to updating to 7.2 As usual I am using systemctl start named-chroot to start the server. Any ideas? Emmett

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Re: [CentOS] what browser plugin provides Quicktime on 7.2?
by Richard 06 Jan '16

06 Jan '16

> Date: Tuesday, January 05, 2016 21:00:17 -0500 > From: Fred Smith <fredex(a)fcshome.stoneham.ma.us> > > Several of the plugins I used on C6 no longer seem to be available, > so I can't figure out what to use for Quicktime > (apple.com/trailers) > > Advice appreciated! > > Fred These play fine with Chrome. The problem with Firefox appears to be that the apple site is sending the wrong coding for FF so requiring embedded quicktime, rather than using FF's HTML5. See: <https://www.reddit.com/r/firefox/comments/3jtuxr/firefox_and_apple_trailers/> specifically the third comment (by caspy7). Follow caspy7's github link for further discussion and help on the user-agent resolution. Switching my FF user-agent to claim it was my tablet's chrome let these videos play fine. It appears that Apple's view is that page designers shouldn't be coding to require the plugin -- see bottom of: <https://support.apple.com/en-us/HT205081> so it's somewhat amusing that their site is doing just that.

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Re: [CentOS] ICMP outoging traffic at centos 6.7
by Gordon Messmer 06 Jan '16

06 Jan '16

On 01/06/2016 07:56 AM, Shital Sakhare wrote: > Yes, now I am dropping packets in OUTPUT chain for type 3. That's what it sounded like, but I didn't want to assume that because it's absolutely insane. If you don't want to send ICMP traffic, then drop incoming traffic that you don't want instead of rejecting it.

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ICMP outoging traffic at centos 6.7
by Shital Sakhare 06 Jan '16

06 Jan '16

Hi, >From last some days I am facing the unexpected huge ICMP traffic is going out from Server. I have blocked icmp ports in iptables and if I execute the Ping manualy its blocking. Some process is send this huge traffic. Below is tcpdump output. ================================ 16:23:27.817856 IP (tos 0xc0, ttl 64, id 55278, offset 0, flags [none], proto ICMP (1), length 104) example.com > ***.***.***.***: ICMP host example.com unreachable - admin prohibited, length 84 IP (tos 0x0, ttl 56, id 52085, offset 0, flags [DF], proto TCP (6), length 76) ***.***.***.***.5189 > example.com.https: Flags [P.], cksum 0xa427 (correct), seq 2571871600:2571871636, ack 1159342022, win 65535, length 36 ================================ How this can be controlled ? Thanks, Shital

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Re: [CentOS] No GUI with CentOS-7.2
by John Hodrien 06 Jan '16

06 Jan '16

Are you debugging the wrong bit? Isn't this X starting correctly, but the xinit desktop environment is likely failing? jh

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Run cornjobs only when a user is logged
by C.L. Martinez 06 Jan '16

06 Jan '16

Hi all, Is it possible to run cronjobs configured by a user to run only when he/she is logged (via GDM/KDM,etc.)? Thanks.

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(OT) Computer seems to have died
by tdukes＠palmettoshopper.com 06 Jan '16

06 Jan '16

Hello, I have an old IBM Netvista. Lately, it would seem to go into sleep mode but I have all that disabled. I would have to power off to wake it up. Now I think its done. I can't even get to the CMOS/BIOS. The power light is on but no beeps or anything spinning up. I have two of these Netvistas and had put on away when I upgraded one of the machines. I pulled the HD from it and installed it in the other. Same thng. I'm fairly certain it was working when I updraded. I've swapped out monitors as well. Power supply or hard drive, any ideas? TIA

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what browser plugin provides Quicktime on 7.2?
by Fred Smith 06 Jan '16

06 Jan '16

Several of the plugins I used on C6 no longer seem to be available, so I can't figure out what to use for Quicktime (apple.com/trailers) Advice appreciated! Fred -- ---- Fred Smith -- fredex(a)fcshome.stoneham.ma.us ----------------------------- Show me your ways, O LORD, teach me your paths; Guide me in your truth and teach me, for you are God my Savior, And my hope is in you all day long. -------------------------- Psalm 25:4-5 (NIV) --------------------------------

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