Discuss April 2015

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168 participants
187 discussions

Find installed yum groups?
by Les Mikesell 28 Apr '15

28 Apr '15

Is there an 'after the fact' way to find what yum groups are installed, including ones that were added with 'yum groupinstall' instead of the initial anaconda install? -- Les Mikesell lesmikesell(a)gmail.com

4 8

Prevent network setup from changing the hostname
by Robert Nichols 28 Apr '15

28 Apr '15

How can I block network setup (via NetworkManager) from changing the machine's hostname whenever the network configuration changes? The problem: When my graphical login session starts, the xauth database gets an token that is labeled with the hostname at that time. If there is not yet a network connection, that will be "localhost.localdomain". When a network connection is then made (my wireless connection needs the key from my login), the hostname changes. That breaks X session sharing because there is no xauth token that matches the current hostname. If I get a root shell with "su -", commands launched from that shell cannot access the display. If I set up an ssh connection with "ssh -X", I get a complaint about missing xauth data. On systems with an "ONBOOT=yes" network connection, there is no problem since the hostname is set before the X session starts. It's just when the hostname changes during the X session that there is a problem. I am running CentOS 6, fully updated. It's taken me a long time to track down the root cause of this problem. Now I just need a solution, preferably something less ham-fisted than "xhost -". -- Bob Nichols "NOSPAM" is really part of my email address. Do NOT delete it.

4 9

Fwd: Cross Building Tcl using Mingw32-gcc (4.9.2)
by Robert Heller 28 Apr '15

28 Apr '15

I posted this to the comp.lang.tcl newsgroup, but it might relate to a possible bug in the Mingw32 cross-build environment under CentOS 6 (or EPEL). Forwarded Message: From: Robert Heller <heller(a)deepsoft.com> Subject: Cross Building Tcl using Mingw32-gcc (4.9.2) Newsgroups: comp.lang.tcl Message-ID: <Nc-dnd1wRNTsy6PInZ2dnUU7-b-dnZ2d(a)giganews.com> Date: Mon, 27 Apr 2015 10:32:01 -0500 I am trying to cross-build Tcl (8.5.8) and I have encounted two problems: One I easily hacked the sources (wrapped the offending lines with #ifdefs): ./../generic/tclPosixStr.c:347:5: error: duplicate case value case EPFNOSUPPORT: return "EPFNOSUPPORT"; ^ ./../generic/tclPosixStr.c:290:5: error: previously used here case ENOPROTOOPT: return "ENOPROTOOPT"; ^ ./../generic/tclPosixStr.c: In function 'Tcl_ErrnoMsg': ./../generic/tclPosixStr.c:795:5: error: duplicate case value case EPFNOSUPPORT: return "protocol family not supported"; ^ ./../generic/tclPosixStr.c:738:5: error: previously used here case ENOPROTOOPT: return "bad protocol option"; ^ The other I am not sure how to fix: i686-w64-mingw32-gcc -c -O2 -fomit-frame-pointer -Wall -I"../../generic" -DTCL_TOMMATH -DMP_PREC=4 -I"../../libtommath" -I".." -DPACKAGE_NAME=\"\" -DPACKAGE_TARNAME=\"\" -DPACKAGE_VERSION=\"\" -DPACKAGE_STRING=\"\" -DPACKAGE_BUGREPORT=\"\" -DSTDC_HEADERS=1 -DHAVE_NO_SEH=1 -DHAVE_NO_LPFN_DECLS=1 -DHAVE_ALLOCA_GCC_INLINE=1 -DHAVE_CAST_TO_UNION=1 -DTCL_CFGVAL_ENCODING=\"cp1252\" -DHAVE_SYS_TYPES_H=1 -DHAVE_SYS_STAT_H=1 -DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1 -DHAVE_MEMORY_H=1 -DHAVE_STRINGS_H=1 -DHAVE_INTTYPES_H=1 -DHAVE_STDINT_H=1 -DHAVE_UNISTD_H=1 -DTCL_CFG_OPTIMIZED=1 -DTCL_CFG_DEBUG=1 -DBUILD_tcl "../tclWin32Dll.c" -o tclWin32Dll.o ./tclWin32Dll.c:65:3: error: conflicting types for 'EXCEPTION_REGISTRATION' } EXCEPTION_REGISTRATION; ^ In file included from /usr/i686-w64-mingw32/sys-root/mingw/include/minwindef.h:146:0, from /usr/i686-w64-mingw32/sys-root/mingw/include/windef.h:8, from /usr/i686-w64-mingw32/sys-root/mingw/include/windows.h:69, from ../tclWinPort.h:72, from ../../generic/tclPort.h:25, from ../../generic/tclInt.h:3946, from ../tclWinInt.h:17, from ../tclWin32Dll.c:16: /usr/i686-w64-mingw32/sys-root/mingw/include/winnt.h:3554:43: note: previous declaration of 'EXCEPTION_REGISTRATION' was here typedef EXCEPTION_REGISTRATION_RECORD EXCEPTION_REGISTRATION; ^ Is there a solution possible? This looks like internal inconsistency with the header files that are part of the build toolchain. -- Robert Heller -- 978-544-6933 Deepwoods Software -- Custom Software Services http://www.deepsoft.com/ -- Linux Administration Services heller(a)deepsoft.com -- Webhosting Services

1 1

Real sh? Or other efficient shell for non-interactive scripts
by E.B. 28 Apr '15

28 Apr '15

I'm sure most people here know about Dash in Debian. Have there been discussions about providing a more efficient shell in Centos for use with heavily invoked non-interactive scripts? With sh being a link to bash in Centos I don't know if it would explode if the link was changed to something else, but at least the scripts we made on our own that run certain services could be changed and tested manually to another shell. Are there other people who have experience in this and can provide interesting guidance?

19 83

Thread moderation and warning: [ Real sh? Or other...]
by Jim Perrin 28 Apr '15

28 Apr '15

This thread has spiraled out of control and will be dealt with. I will again speak with people privately. Some are repeat offenders and may have their contributions to the mailing list moderated. Please keep to the topic posted by the original author, and keep the list technical in nature. -- Jim Perrin The CentOS Project | http://www.centos.org twitter: @BitIntegrity | GPG Key: FA09AD77

1 0

Boot message of a modprobe.d conf file that does not exist
by Tim 28 Apr '15

28 Apr '15

Hi all, I got a message at boot: dracut-pre-udev: libkmod: kmod_config_parse: /etc/modprobe.d/thinkpad_battery.conf line 2: ignoring bad line starting with 'options' I have had this file to load modules for my thinkpad (acpi_call & tp_smapi) but I removed it after recompiling the modules for a new kernel and using "make install load". My question is, why this nonexistent file is still demanded. Thanks in advance Tim

2 2

CentOS 6.6 x86_64, rpm error: rpmdbNextIterator: skipping h# ...
by carlh04426＠gmail.com 28 Apr '15

28 Apr '15

Hi All, I had some health issues for a few months and I barely recall dealing with Heartbleed ... it's all just a blur. Now I'm getting back up to speed, but I have a pair of CentOS 6.6 x86_64 + Virtualmin 4.13 GPL servers which no longer seem to be picking up available updates. 'yum check' ran for about 25 minutes this evening on one of them and returned nothing useful. rpm -qa --last is returning this (lines intentionally split): error: rpmdbNextIterator: skipping h# 259 Header V3 RSA/SHA256 \ Signature, key ID c105b9de: BAD error: rpmdbNextIterator: skipping h# 4 Header V3 RSA/SHA256 \ Signature, key ID c105b9de: BAD error: rpmdbNextIterator: skipping h# 1028 Header V3 RSA/SHA1 \ Signature, key ID c105b9de: BAD - - - - 8< snipped for brevity, continuing to end - - - - ->8 - - - - error: rpmdbNextIterator: skipping h# 1019 Header V3 RSA/SHA1 \ Signature, key ID c105b9de: BAD gpg-pubkey-fe837f6f-4e0fd77e Thu 17 Jul 2014 12:00:11 AM EDT gpg-pubkey-ef1d6db8-4e0fd7f0 Thu 17 Jul 2014 12:00:11 AM EDT gpg-pubkey-d0ff3d16-4e0fd442 Thu 17 Jul 2014 12:00:11 AM EDT gpg-pubkey-a0bdbcf9-42d1d837 Thu 17 Jul 2014 12:00:11 AM EDT gpg-pubkey-11f63c51-3c7dc11d Thu 17 Jul 2014 12:00:11 AM EDT gpg-pubkey-c105b9de-4e0fd3a3 Tue 15 Jul 2014 02:32:15 AM EDT gpg-pubkey-0608b895-4bd22942 Mon 14 Jul 2014 07:59:25 PM EDT gpg-pubkey-6b8d79e6-3f49313d Mon 14 Jul 2014 07:57:56 PM EDT I'd be extremely grateful for any guidance or ideas you may wish to share. TIA & regards, Carl

2 3

Route traffic through private IP for only certain hosts
by Ian 28 Apr '15

28 Apr '15

Hi I am having a weird problem which I cant figure out - so I was hoping someone here could give me a hand. First off the end goal is that a specific server in my network runs an IPSEC connection to another company and I want all other servers to route traffic for the IP on that network through this single server. Server 1 in this example is the server that runs the IPSEC connection. (CentOS 6.6) Server 2 in this example is an app server that would route traffic for only that specific IP through server 1. (CentOS 6.5) **Some IP's that will be used below:** Server 1 <pre> Server 1 Public IP: x.x.x.x Server 1 Public Broadcast: x.x.x.y Server 1 Public Gateway: x.x.x.z Server 1 Internal IP: 10.0.64.10/24 </pre> Server 2 <pre> Server 2 Public IP: y.y.y.y Server 2 Public Broadcast: y.y.y.z Server 2 Public Gateway: y.y.y.a Server 2 Internal IP: 10.0.64.150/24 </pre> Those servers have full connectivity between them internally (i.e. I can ping, ssh etc from one to the other without problem). They also both have full acceess to the internet and can be reached that way ---------- **Server 1** Here is an *ip a* for that <pre># ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:0c:29:99:12:85 brd ff:ff:ff:ff:ff:ff inet x.x.x.x/28 brd x.x.x.y scope global eth0 inet6 xxxx:xxxx:xxxx:xxxx/64 scope link valid_lft forever preferred_lft forever 3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:0c:29:99:12:8f brd ff:ff:ff:ff:ff:ff inet 10.0.64.10/24 brd 10.0.64.255 scope global eth1 inet6 fe80::20c:29ff:fe99:128f/64 scope link valid_lft forever preferred_lft forever </pre> Here is an *ip route* <pre># ip route x.x.x.y/28 dev eth0 proto kernel scope link src x.x.x.x 10.0.64.0/24 dev eth1 proto kernel scope link src 10.0.64.10 169.254.0.0/16 dev eth0 scope link metric 1002 169.254.0.0/16 dev eth1 scope link metric 1003 default via x.x.x.z dev eth0 </pre> Here is a *sysctl -p* <pre> # sysctl -p net.ipv4.conf.default.rp_filter = 1 net.ipv4.conf.default.accept_source_route = 0 kernel.sysrq = 0 kernel.core_uses_pid = 1 net.ipv4.tcp_syncookies = 1 kernel.msgmnb = 65536 kernel.msgmax = 65536 kernel.shmmax = 68719476736 kernel.shmall = 4294967296 net.ipv4.ip_forward = 1 net.ipv6.conf.all.forwarding = 1 net.ipv4.conf.default.proxy_arp = 1 net.ipv4.conf.all.rp_filter = 1 kernel.sysrq = 1 net.ipv4.conf.default.send_redirects = 1 net.ipv4.conf.all.send_redirects = 1 </pre> ---------- **Server 2** I've added a single test ip (8.8.8.8) to server two to test if it works before bringing IPSEC into the equation Here is an *ip a* <pre> # ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000 link/ether 00:0c:29:15:8b:01 brd ff:ff:ff:ff:ff:ff inet y.y.y.y/29 brd y.y.y.z scope global eth0 inet6 fe80::20c:29ff:fe15:8b01/64 scope link valid_lft forever preferred_lft forever 3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000 link/ether 00:0c:29:15:8b:0b brd ff:ff:ff:ff:ff:ff inet 10.0.64.150/24 brd 10.0.64.255 scope global eth1 inet6 fe80::20c:29ff:fe15:8b0b/64 scope link valid_lft forever preferred_lft forever </pre> Here is an *ip route* <pre> # ip route 8.8.8.8 via 10.0.64.10 dev eth1 y.y.y.z/29 dev eth0 proto kernel scope link src y.y.y.y 10.0.64.0/24 dev eth1 proto kernel scope link src 10.0.64.150 default via y.y.y.a dev eth0 </pre> ---------- Now when I try do a ping from Server 2 -> 8.8.8.8 here are the tcpdumps from each server: **Server 2** If I tcpdump on eth0 i get no matches (so the route appears right!). eth1 gets matches: <pre> # tcpdump -vvv -i eth1 -n host 8.8.8.8 tcpdump: listening on eth1, link-type EN10MB (Ethernet), capture size 65535 bytes 11:25:55.609902 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto ICMP (1), length 84) 10.0.64.150 > 8.8.8.8: ICMP echo request, id 17999, seq 1, length 64 11:25:56.609262 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto ICMP (1), length 84) 10.0.64.150 > 8.8.8.8: ICMP echo request, id 17999, seq 2, length 64 </pre> **Server 1 (The hopeful gateway for 8.8.8.8)** On eth1 (Private) <pre> # tcpdump -vv -i eth1 -n host 8.8.8.8 tcpdump: listening on eth1, link-type EN10MB (Ethernet), capture size 65535 bytes 11:27:20.608766 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto ICMP (1), length 84) 10.0.64.150 > 8.8.8.8: ICMP echo request, id 17999, seq 86, length 64 11:27:21.608738 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto ICMP (1), length 84) 10.0.64.150 > 8.8.8.8: ICMP echo request, id 17999, seq 87, length 64 </pre> On eth0 (public) <pre> # tcpdump -vv -i eth0 -n host 8.8.8.8 tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes 11:29:04.608773 IP (tos 0x0, ttl 63, id 0, offset 0, flags [DF], proto ICMP (1), length 84) 10.0.64.150 > 8.8.8.8: ICMP echo request, id 17999, seq 190, length 64 11:29:05.608800 IP (tos 0x0, ttl 63, id 0, offset 0, flags [DF], proto ICMP (1), length 84) 10.0.64.150 > 8.8.8.8: ICMP echo request, id 17999, seq 191, length 64 </pre> I've disabled the FW on both (as a test), made sure to not have any blocking rules on FORWARD traffic (as a separate test) and I just never get my traffic through from Server 2 to 8.8.8.8. I've also tried substituting 8.8.8.8 for another server that is reachable from both servers and the same thing happens. I'm open to any suggestions - i'm super confused :) Thanks in advance, Ian

3 2

Re: [CentOS] Real sh? Or other efficient shell for non-interactive scripts
by m.roth＠5-cent.us 27 Apr '15

27 Apr '15

Joerg Schilling wrote: > Les Mikesell <lesmikesell(a)gmail.com> wrote: > >> On Mon, Apr 27, 2015 at 12:10 PM, Joerg Schilling >> <Joerg.Schilling(a)fokus.fraunhofer.de> wrote: >> > > >> > If you combine ZFS and Linux, you create a permitted "collective work" and the GPL cannot extend it's rules to the CDDLd separate and independend >> > work ZFS of course. >> >> Which countries' copyright laws would permit that explicitly even when some of the components' licenses prohibit it? > > Fortunately, Europe and the USA declare the same parts of the GPL void, these parts would prevent such a combination. <snip> First, I was not aware that the US had declared any part of the GPL null and void. Second, just to play Eris... which *version* of the GPL are you talking about in this arguement, 1.x, 2.x, or 3.x? mark

2 1

CentOS 7.1 How to change panel background
by Globe Trotter 27 Apr '15

27 Apr '15

Hi, I just installed CentOS and have been trying to change the desktop panel background (in gnome classic) to black. How do I do this? Holding the alt button while right-clicking on the mouse does not seem to do anything. I do not have anything installed (other than what came with the LiveCD). Many thanks!

1 0

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Discuss April 2015