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34753 discussions

Hiding a network printer
by Frank Cox 13 Oct '14

13 Oct '14

I want to hide a printer that's connected to a Centos 6 printer server to prevent it showing up on some of the other computers on the local network. Using system-config-printer, putting the IP address of the computer that I want to hide the printer from into the Access Control window for that printer doesn't work since it apparently wants a user name, not an IP address. How can I specify that the printer can be seen only by certain IP addresses but not others? -- MELVILLE THEATRE ~ Real D 3D Digital Cinema ~ www.melvilletheatre.com

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centos7 livecd yum problem
by Don Vogt 13 Oct '14

13 Oct '14

I started to install centos7 using a livecd image. After booting the cd I tried a "yum install mc" which failed. I then tried "yum update" and got the following output. "[liveuser@localhost ~]$ sudo yum update Loaded plugins: fastestmirror, langpacks Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os error was 14: curl#6 - "Could not resolve host: mirrorlist.centos.org; Unknown error" One of the configured repositories failed (Unknown), and yum doesn't have enough cached data to continue. At this point the only safe thing yum can do is fail. There are a few ways to work "fix" this: 1. Contact the upstream for the repository and get them to fix the problem. 2. Reconfigure the baseurl/etc. for the repository, to point to a working upstream. This is most often useful if you are using a newer distribution release than is supported by the repository (and the packages for the previous distribution release still work). 3. Disable the repository, so yum won't use it by default. Yum will then just ignore the repository until you permanently enable it again or use --enablerepo for temporary usage: yum-config-manager --disable <repoid> 4. Configure the failing repository to be skipped, if it is unavailable. Note that yum will try to contact the repo. when it runs most commands, so will have to try and fail each time (and thus. yum will be be much slower). If it is a very temporary problem though, this is often a nice compromise: yum-config-manager --save --setopt=<repoid>.skip_if_unavailable=true Cannot find a valid baseurl for repo: base/7/x86_64 I looked at thgeCentos-Base. repo from the live cd and it looks the same as the repo in centos6.5. I have no idea what to do next. This is my attempt to do step 1. above because I don't know how to do step 2. Any help would be appreciated on using the liveCD. Thanks

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turn bootable USB into bootable iso image
by Steve Clark 13 Oct '14

13 Oct '14

Hello List I have a Bootable USB stick that we use to Boot our servers and then install CentOS, PostgreSQL and our SW thru a Kickstart script. It works like a charm but now we are thinking of going Virtual and prepping Virtual CentOS servers under VMware ESXi. However, to have the same "Boot and Install" functionality I see no other solution than Booting a VMware machine from an ISO. So, what I would like to do is to take the Bootable USB and make it into an ISO. Any ideas? Thanks, -- Stephen Clark

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答复: turn bootable USB into bootable iso image
by 沈焕标 13 Oct '14

13 Oct '14

I am sorry for my misunderstanding. And I thing you should try the command "dd" to create an ISO file. For example: dd if=/dev/sdX of=/xxx/xxx/xxx.iso... I hope you will make it.. ------------------------ Best wishes ----------- ---------------Bill Shen ------------------------ ________________________________ 发件人: aravind J<mailto:aravindkumar.leo@gmail.com> 发送时间: ‎2014/‎10/‎11 17:32 收件人: CentOS mailing list<mailto:centos@centos.org> 主题: Re: [CentOS] turn bootable USB into bootable iso image On Oct 10, 2014 7:12 PM, "Steve Clark" <sclark(a)netwolves.com> wrote: > > Hello List > > I have a Bootable USB stick that we use to Boot our servers and then install CentOS, > PostgreSQL and our SW thru a Kickstart script. > > It works like a charm but now we are thinking of going Virtual and prepping Virtual CentOS servers under VMware ESXi. > > However, to have the same "Boot and Install" functionality I see no other solution than Booting a VMware machine from an ISO. > > So, what I would like to do is to take the Bootable USB and make it into an ISO. > > Any ideas? > Hi, Not sure whether the following will work, but just a thought. Create an .img file from the usb by doing a 'dd' from usb to .img file. Then attach the .img file to the vm as a disk and then boot the vm from the disk image to start regular kickstart installation. Thanks & Regards, Aravind _______________________________________________ CentOS mailing list CentOS(a)centos.org http://lists.centos.org/mailman/listinfo/centos

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Recommended way of handling iptables firewall in CentOS?
by Niki Kovacs 13 Oct '14

13 Oct '14

Hi, I'm planning to use CentOS 6.x on a handful of LAN servers. So far I've been using Slackware64 14.0 and 14.1 for the job. I wonder what's the orthodox/recommended way of configuring and iptables firewall with CentOS. I understand there's the system-config-securitylevel-tui NCurses interface which allows defining a basic set of rules. But what about the handful of more advanced rules I have to configure? Here's an example of an /etc/rc.d/rc.firewall script that I might use with Slackware. It contains mostly basic rules, and a couple of more advanced rules, one to limit SSH access, the other one to redirect HTTP traffic to Squid. If I want to copy my actual firewall configuration to CentOS, what would be the recommended way? I started from a bare bones minimal CentOS 6.5 installation, so system-config-securitylevel-tui is not even installed. Is it a good idea to try to configure /etc/sysconfig/iptables by hand? What do you suggest? Cheers, Niki -- Microlinux - Solutions informatiques 100% Linux et logiciels libres 7, place de l'église - 30730 Montpezat Web : http://www.microlinux.fr Mail : info(a)microlinux.fr Tél. : 04 66 63 10 32

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Hi again & problem with minimal CentOS and Github
by Niki Kovacs 13 Oct '14

13 Oct '14

Hi everybody, I'm back to CentOS after a long period during which I've been using mainly Slackware. I still use Slackware for teaching and for my local clients (on servers and desktops), but right now, I'm planning to update my own documentation about CentOS, which is still based on version 5.x. First things first. For the moment I have a sandbox server in my office with a minimal installation of CentOS 6.5. It's a very stripped installation, and I want to keep it that way, installing things only as I need them. So I did *not* do a "yum groupinstall Base" after the initial installation. I installed Git and Vim and cloned my Github repository for CentOS. But when I make a modification and want to push it to Github, I get the following error: # git push error: The requested URL returned error: 403 Forbidden while accessing https://github.com/kikinovak/centos/info/refs fatal: HTTP request failed Now I think there must be some missing component in my CentOS installation, because my Slackware workstation in the same network can push things just fine. Any idea what's missing here? Cheers from the flooded South of France, Niki -- Microlinux - Solutions informatiques 100% Linux et logiciels libres 7, place de l'église - 30730 Montpezat Web : http://www.microlinux.fr Mail : info(a)microlinux.fr Tél. : 04 66 63 10 32

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systemd service configuration
by Igal ＠ getRailo.org 13 Oct '14

13 Oct '14

does adding a /lib/systemd/system/{unit}.service all I need in order to add a service? see example file for Tomcat that I plan to add at https://github.com/wichtounet/systemd-unit-files/blob/master/tomcat.service are any special permissions required for that file (execute)? TIA, Igal

3 2

drbd
by John R Pierce 12 Oct '14

12 Oct '14

so I've had a drbd replica running for a while of a 16TB raid thats used as a backuppc repository. when I have rebooted the backuppc server, the replica doesn't seem to auto-restart til I do it manually, and the backupc /data file system on this 16TB LUN doesn't seem to automount, either. I've rebooted this thing a few times in the 18 months or so its been running... not always cleanly... anyways, I'm started a drbd verify (from the slave) about 10 hours ago, it has 15 hours more to run, and so far it's logged... Oct 11 13:58:26 sg2 kernel: block drbd0: Starting Online Verify from sector 3534084704 Oct 11 14:00:23 sg2 kernel: block drbd0: [drbd0_worker/2197] sock_sendmsg time expired, ko = 4294967295 Oct 11 14:00:29 sg2 kernel: block drbd0: [drbd0_worker/2197] sock_sendmsg time expired, ko = 4294967294 Oct 11 14:00:35 sg2 kernel: block drbd0: [drbd0_worker/2197] sock_sendmsg time expired, ko = 4294967293 Oct 11 14:00:41 sg2 kernel: block drbd0: [drbd0_worker/2197] sock_sendmsg time expired, ko = 4294967292 Oct 11 14:01:16 sg2 kernel: block drbd0: [drbd0_worker/2197] sock_sendmsg time expired, ko = 4294967295 Oct 11 14:02:05 sg2 kernel: block drbd0: [drbd0_worker/2197] sock_sendmsg time expired, ko = 4294967295 Oct 11 14:02:11 sg2 kernel: block drbd0: [drbd0_worker/2197] sock_sendmsg time expired, ko = 4294967294 Oct 11 14:02:17 sg2 kernel: block drbd0: [drbd0_worker/2197] sock_sendmsg time expired, ko = 4294967293 Oct 11 14:33:41 sg2 kernel: block drbd0: Out of sync: start=3932979480, size=8 (sectors) Oct 11 14:34:46 sg2 kernel: block drbd0: Out of sync: start=3946056120, size=8 (sectors) Oct 11 15:37:07 sg2 kernel: block drbd0: Out of sync: start=4696809024, size=8 (sectors) Oct 11 17:08:15 sg2 kernel: block drbd0: Out of sync: start=6084949528, size=8 (sectors) Oct 11 17:30:53 sg2 kernel: block drbd0: Out of sync: start=6567543472, size=8 (sectors) Oct 11 17:59:04 sg2 kernel: block drbd0: Out of sync: start=7169767896, size=8 (sectors) Oct 11 20:00:50 sg2 kernel: block drbd0: [drbd0_worker/2197] sock_sendmsg time expired, ko = 4294967295 Oct 11 20:01:09 sg2 kernel: block drbd0: [drbd0_worker/2197] sock_sendmsg time expired, ko = 4294967295 Oct 11 20:01:15 sg2 kernel: block drbd0: [drbd0_worker/2197] sock_sendmsg time expired, ko = 4294967294 Oct 11 20:01:29 sg2 kernel: block drbd0: [drbd0_worker/2197] sock_sendmsg time expired, ko = 4294967295 Oct 11 20:29:18 sg2 kernel: block drbd0: Out of sync: start=10362907296, size=8 (sectors) Oct 11 20:29:54 sg2 kernel: block drbd0: Out of sync: start=10375790488, size=8 (sectors) Oct 11 21:01:51 sg2 kernel: block drbd0: [drbd0_worker/2197] sock_sendmsg time expired, ko = 4294967295 Oct 11 21:42:15 sg2 kernel: block drbd0: Out of sync: start=11907921096, size=8 (sectors) Oct 11 21:43:38 sg2 kernel: block drbd0: Out of sync: start=11937086248, size=8 (sectors) Oct 11 21:44:00 sg2 kernel: block drbd0: Out of sync: start=11944705032, size=8 (sectors) Oct 11 21:49:26 sg2 kernel: block drbd0: Out of sync: start=12062270432, size=8 (sectors) Oct 11 22:07:10 sg2 kernel: block drbd0: Out of sync: start=12440235128, size=8 (sectors) Oct 11 22:58:54 sg2 kernel: block drbd0: Out of sync: start=13548501984, size=8 (sectors) Oct 11 23:23:17 sg2 kernel: block drbd0: Out of sync: start=14072873320, size=8 (sectors) $ date Sat Oct 11 23:28:11 PDT 2014 its 35% done at this point... 15 4K blocks out wrong of 1/3rd of 16TB isn't a lot, but its still more than I like to see. $ cat /proc/drbd version: 8.3.15 (api:88/proto:86-97) GIT-hash: 0ce4d235fc02b5c53c1c52c53433d11a694eab8c build by phil@Build64R6, 2012-12-20 20:09:51 0: cs:VerifyS ro:Secondary/Primary ds:UpToDate/UpToDate C r----- ns:0 nr:105707 dw:187685496 dr:654444832 al:0 bm:1 lo:107 pe:2104 ua:435 ap:0 ep:1 wo:f oos:60 [=====>..............] verified: 34.6% (9846140/15051076)M finish: 14:55:27 speed: 187,648 (155,708) want: 204,800 K/sec really, if I let this complete, then disconnect/reconnect the replica, it will repair these glitches ? I'm gathering I shoudl schedule these verifies weekly or something. -- john r pierce 37N 122W somewhere on the middle of the left coast

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install mp3gain
by Chris 12 Oct '14

12 Oct '14

Dear All, what's the easiest way to install mp3gain on CentOS 6? I've found it in the rpmforge repository only. I don't want to add it since there are many obsolete packages in. Is there any other way? TIA! -- Gruß, Christian

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CentOS 7 does not pick up my atheros wireless
by Martes 12 Oct '14

12 Oct '14

Greetings everyone. My recently installed CentOS 7 instance does not enable wireless via Network Manager or otherwise. I have the following output from lspci: lspci |grep AR 08:05.0 Ethernet controller: Qualcomm Atheros AR5212/AR5213 Wireless Network Adapter (rev 01) uname -a Linux imaginationland 3.10.0-123.8.1.el7.x86_64 #1 SMP Mon Sep 22 19:06:58 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux iw --version iw version 3.10 iw -l reports that nl80211 is not found, which is probably the root cause of not having access to the pci device, however, I have no idea why I am unable to access this module. I am unable to get wireless working, however, just prior to uninstalling network manager, I did see it there. I use one of the vms as backup for my personal groupware server which needs to stay active, so I removed network manager, and made sure the configuration for the network and iptables was valid, prior to re-installing network manager. However, after re-installing, Network Manager never sees the wireless device at all. Any assistance would be appreciated. I have not had this type of trouble with linux in quite a few years, and usually if anything I just needed to install the 80211 kernel modules, etc... I am unable to even pull those from repos, on this new install. Respectfully, Martes G Wigglesworth

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