Discuss September 2015

discuss@lists.centos.org

136 participants
132 discussions

Memory vs. Display Card
by Rick 28 Oct '25

28 Oct '25

Since memory has become quite cheap lately I decided to move from 2 GB to 6. When I installed the memory every thing was fine until I went to run level 5. At that point the screen turned to garbage and the system froze. Is there a way to fix this so I can use the memory I bought? Do I need a new display card? Current hardware: Intel D975XBX2 Motherboard VGA compatible controller: ATI Technologies Inc RV505 [Radeon X1550 64-bit] -- http://www.spinics.net/lists/

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SSD for Centos SWAP /tmp & /var/ partition
by Keith Roberts 03 Sep '25

03 Sep '25

Has anyone actually used a SSD in a Centos setup? My little experiment with a s/h WD drive for /tmp and SWAP partitions kicked the bucket on Wednesday, when the poor WD drive caught the click-of-death. It was a s/h drive to start with and lasted about 4 months. But that was without the /var/log/ partition being written to it, as I mounted that back onto /var/log from the original drive. So I had to install another (WD) drive, and repartion it and rebuild my RPM package database, from the backed-up Packages file. That seems to be all OK now. I'm wondering if it would be a good idea to use a new SSD for moving all the disk i/o to, that Linux likes to do so often. Plus putting SWAP onto a decent SSD should speed things up somewhat. Here's a short video of a laptop fitted with a SSD drive booting macOS, compared to a similar laptop booting from the standard HDD. The laptop with the SSD boots and loads some apps in 28 seconds. The other one takes twice as long. http://eshop.macsales.com/shop/SSD/OWC/Mercury_Extreme_Pro_6G/?utm_source=t… Kind Regards, Keith Roberts ----------------------------------------------------------------- Websites: http://www.karsites.net http://www.php-debuggers.net http://www.raised-from-the-dead.org.uk All email addresses are challenge-response protected with TMDA [http://tmda.net] -----------------------------------------------------------------

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I want to connect to a l2tp server from centos.
by Eliezer Croitoru 22 Mar '17

22 Mar '17

I have a server currently connecting to a pptp remote server. This server(lns\lac) has the option for pptp connections and l2tp connections. The l2tp connections are not using ipsec encryption at all. I have seen couple guides\tutorials on the internet: - https://raymii.org/s/tutorials/IPSEC_L2TP_vpn_on_CentOS_-_Red_Hat_Enterpris… - https://wiki.archlinux.org/index.php/L2TP/IPsec_VPN_client_setup But all the guides that I have found are using ipsec with "secret". On ubuntu there is a gui applet that helps setting these kind of connections up but I am working with a CentOS server and not Ubuntu desktop. If someone used l2tp the same way I want to use on CentOS 7 please give me some advice. If you have a guide which might help me I will be more then happy to see this one. Thanks, Eliezer

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abrt-watch-log -F BUG: WARNING: at WARNING: CPU: INFO: possible recursive locking detected
by Michael H 15 Feb '16

15 Feb '16

Hi All, I've been tuning a server recently and just today this has started to appear in my top/htop output. [root@db1 ~]# ps -aux | grep kernel root 1011 0.0 0.0 212048 4532 ? Ss 13:34 0:00 /usr/bin/abrt-watch-log -F BUG: WARNING: at WARNING: CPU: INFO: possible recursive locking detected ernel BUG at list_del corruption list_add corruption do_IRQ: stack overflow: ear stack overflow (cur: eneral protection fault nable to handle kernel ouble fault: RTNL: assertion failed eek! page_mapcount(page) went negative! adness at NETDEV WATCHDOG ysctl table check failed : nobody cared IRQ handler type mismatch Machine Check Exception: Machine check events logged divide error: bounds: coprocessor segment overrun: invalid TSS: segment not present: invalid opcode: alignment check: stack segment: fpu exception: simd exception: iret exception: /var/log/messages -- /usr/bin/abrt-dump-oops -xtD I had made a few changes to sysctl.conf which I have now reverted and the error still exists. my sysctl.conf contained; vm.swappiness=0 vm.overcommit_memory=2 vm.overcommit_ratio=90 - this was only added this morning because of an 'out of memory' error in postgresql. kernel.shmmax=35433480192 kernel.shmall=2214592512 which I have now removed. Can anyone shine any light on this? A little search on Google mentions faulty memory, I will install memtest today and see what the output is like. Thanks Michael

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PV AMI for CentOS 7
by Jo Rhett 20 Oct '15

20 Oct '15

Is there any chance we could get a PV AMI for CentOS 7 to match the HVM version at https://aws.amazon.com/marketplace/pp/B00O7WM7QW/ref=srh_res_product_title?… We have prepurchased reserved instances based on older PV machines (m1, c1, etc) It would be very very helpful to have a PV AMI so we could migrate to CentOS 7 on those image types. https://bugs.centos.org/view.php?id=9499 <https://bugs.centos.org/view.php?id=9499> -- Jo Rhett Net Consonance : net philanthropy to improve open source and internet projects.

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ExecShield in C6 or C7 kernels?
by Fred Smith 05 Oct '15

05 Oct '15

I'm trying to figure out if the stock kernels for Centos-6 and/or Centos-7 have ExecShield compiled in, and if so, if it is turned on by default. On my local C7 box I've been looking at/for indicators without a lot of success: /usr/lib/sysctl.d/00-system.conf. does not mention ExecShield at all. /proc/sys/kernel has no entries for exec_shield no mention of execshield in any of the files in /etc/grub.d So, as far as I can see, there are no settings that I would expect to force ExecShield to an ON setting. I DO see, in /proc/sys/kernel, a file named randomize_va_space, and it contains a value of "2". I've been googling (well, actually DuckDuckGo-ing) and most of the articles I find regarding ExecShield are 3-10 years old. I'd appreciate pointers/guides/info on ExecShield in C6 or C7. thanks in advance! Fred -- ---- Fred Smith -- fredex(a)fcshome.stoneham.ma.us ----------------------------- "And he will be called Wonderful Counselor, Mighty God, Everlasting Father, Prince of Peace. Of the increase of his government there will be no end. He will reign on David's throne and over his kingdom, establishing and upholding it with justice and righteousness from that time on and forever." ------------------------------- Isaiah 9:7 (niv) ------------------------------

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ERROR Installing Cisco AnyConnect on Centos 6x
by CS DBA 02 Oct '15

02 Oct '15

Hi All; I've downloaded the Cisco AnyConnect tar.gz file for one of our clients, when I untar it and then run the vpn_install script in the vpnclient directory I get the below error. Thanks in advance for any help... / //# ./vpn_install// //Cisco Systems VPN Client Version 4.8.02 (0030) Linux Installer// //Copyright (C) 1998-2006 Cisco Systems, Inc. All Rights Reserved.// // //By installing this product you agree that you have read the// //license.txt file (The VPN Client license) and will comply with// //its terms.// // // //Directory where binaries will be installed [/usr/local/bin]// // //Automatically start the VPN service at boot time [yes]// // //In order to build the VPN kernel module, you must have the// //kernel headers for the version of the kernel you are running.// // // //Directory containing linux kernel source code [/lib/modules/2.6.32-573.7.1.el6.x86_64/build]// // //* Binaries will be installed in "/usr/local/bin".// //* Modules will be installed in "/lib/modules/2.6.32-573.7.1.el6.x86_64/CiscoVPN".// //* The VPN service will be started AUTOMATICALLY at boot time.// //* Kernel source from "/lib/modules/2.6.32-573.7.1.el6.x86_64/build" will be used to build the module.// // //Is the above correct [y]// // //Making module// //make -C /lib/modules/2.6.32-573.7.1.el6.x86_64/build SUBDIRS=/root/vpnclient modules// //make[1]: Entering directory `/usr/src/kernels/2.6.32-573.7.1.el6.x86_64'// //scripts/Makefile.build:49: *** CFLAGS was changed in "/root/vpnclient/Makefile". Fix it to use EXTRA_CFLAGS. Stop.// //make[1]: *** [_module_/root/vpnclient] Error 2// //make[1]: Leaving directory `/usr/src/kernels/2.6.32-573.7.1.el6.x86_64'// //make: *** [default] Error 2// //Failed to make module "cisco_ipsec.ko".// /

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CentOS-6.7 Passing delayed shutdown via ssh command line argument?
by James B. Byrne 30 Sep '15

30 Sep '15

If I log into a host via ssh from my workstation then I can enter this: shutdown -r +90& and log out. The shutdown command will continue in effect and will activae 90 minutes later. However, if I do this instead: ssh -t host.domain.tld 'shutdown -r +90&' then the shutdown command does not remain in effect. Why is this so and is there some way to achieve this? -- *** e-Mail is NOT a SECURE channel *** Do NOT transmit sensitive data via 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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sendmail config finding wrong relay
by Jerry Geis 30 Sep '15

30 Sep '15

Hi all, I set my sendmail.mc file to have a SMART_HOST entry of mail.xyz.com I do "make" and "service sendmail restart" ... I should be good, but no. :) If I do "host mail.xyz.com" I get the correct address and if I "telnet mail.xyz.com 25" I get a connection. however when I do a test mail - its trying to RELAY to another host. I thought SMART_HOST was the only one it would try to relay to? yes there is only one SMART_HOST in my file, and sendmail.cf shows the correct name. How do I tell what is happening here? the maillog only shows it trying to relay to the wrong host, not the one I entered. Any thoughts? Thanks, Jerry

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Keepalived vrrp problem
by Tim Dunphy 30 Sep '15

30 Sep '15

Hey guys, I'm trying to install keepalived 1.2.19 on a centos 6.5 machine. I did an install from source. And when I start keepalived this is what I'm seeing in the logs. It's reporting that the VRRP_Instance(VI_1) Now in FAULT state. Here's more of that log entry: Sep 29 12:06:58 USECLSNDMNRDBA Keepalived_vrrp[44943]: VRRP Instance = VI_1 Sep 29 12:06:58 USECLSNDMNRDBA Keepalived_vrrp[44943]: Using VRRPv2 Sep 29 12:06:58 USECLSNDMNRDBA Keepalived_vrrp[44943]: Want State = MASTER Sep 29 12:06:58 USECLSNDMNRDBA Keepalived_vrrp[44943]: Runing on device = eth1 Sep 29 12:06:58 USECLSNDMNRDBA Keepalived_vrrp[44943]: Gratuitous ARP repeat = 5 Sep 29 12:06:58 USECLSNDMNRDBA Keepalived_vrrp[44943]: Gratuitous ARP refresh repeat = 1 Sep 29 12:06:58 USECLSNDMNRDBA Keepalived_vrrp[44943]: Virtual Router ID = 51 Sep 29 12:06:58 USECLSNDMNRDBA Keepalived_vrrp[44943]: Priority = 101 Sep 29 12:06:58 USECLSNDMNRDBA Keepalived_vrrp[44943]: Advert interval = 1 sec Sep 29 12:06:58 USECLSNDMNRDBA Keepalived_vrrp[44943]: Accept disabled Sep 29 12:06:58 USECLSNDMNRDBA Keepalived_vrrp[44943]: Virtual IP = 1 Sep 29 12:06:58 USECLSNDMNRDBA Keepalived_vrrp[44943]: 10.40.116.34/32 dev eth1 scope global Sep 29 12:06:58 USECLSNDMNRDBA Keepalived_vrrp[44943]: Using LinkWatch kernel netlink reflector... Sep 29 12:06:58 USECLSNDMNRDBA Keepalived_vrrp[44943]: VRRP sockpool: [ifindex(3), proto(112), unicast(0), fd(10,11)] Sep 29 12:06:58 USECLSNDMNRDBA Keepalived_healthcheckers[44942]: ------< Global definitions >------ Sep 29 12:06:58 USECLSNDMNRDBA Keepalived_healthcheckers[44942]: Router ID = USECLSNDMNRDBA Sep 29 12:06:58 USECLSNDMNRDBA Keepalived_healthcheckers[44942]: VRRP IPv4 mcast group = 224.0.0.18 Sep 29 12:06:58 USECLSNDMNRDBA Keepalived_healthcheckers[44942]: VRRP IPv6 mcast group = ff02::12 Sep 29 12:06:58 USECLSNDMNRDBA Keepalived_healthcheckers[44942]: ------< SSL definitions >------ Sep 29 12:06:58 USECLSNDMNRDBA Keepalived_healthcheckers[44942]: Using autogen SSL context Sep 29 12:06:58 USECLSNDMNRDBA Keepalived_healthcheckers[44942]: Using LinkWatch kernel netlink reflector... *Sep 29 12:06:59 USECLSNDMNRDBA Keepalived_vrrp[44943]: Kernel is reporting: interface eth1 DOWN* *Sep 29 12:06:59 USECLSNDMNRDBA Keepalived_vrrp[44943]: VRRP_Instance(VI_1) Now in FAULT state* And if I do an ifconfig command I see no evidence of an eth1 existing. Also I can't ping the virtual address that I'm trying to create: # ping -c 5 10.40.116.34 PING 10.40.116.34 (10.40.116.34) 56(84) bytes of data. >From 10.40.116.30 icmp_seq=2 Destination Host Unreachable >From 10.40.116.30 icmp_seq=3 Destination Host Unreachable >From 10.40.116.30 icmp_seq=4 Destination Host Unreachable >From 10.40.116.30 icmp_seq=5 Destination Host Unreachable --- 10.40.116.34 ping statistics --- 5 packets transmitted, 0 received, +4 errors, 100% packet loss, time 14001ms pipe 3 Here are my configs starting with the first machine: # cat keepalived.conf vrrp_instance VI_1 { interface eth1 state MASTER virtual_router_id 51 priority 101 # 101 on master, 100 on backup vrrp_unicast_bind 10.40.116.30 # Internal IP of this machine vrrp_unicast_peer 10.40.116.31 # Internal IP of peer virtual_ipaddress { 10.40.116.34 } And here's the config on the second machine: # cat /etc/keepalived/keepalived.conf vrrp_instance VI_1 { interface eth1 state MASTER virtual_router_id 51 priority 100 # 101 on master, 100 on backup vrrp_unicast_bind 10.40.116.31 # Internal IP of this machine vrrp_unicast_peer 10.40.116.30 # Internal IP of peer virtual_ipaddress { 10.40.116.34 } Does anyone have any experience in solving this kind of problem? Any suggestions on how to resolve this would be great. Thanks, Tim -- GPG me!! gpg --keyserver pool.sks-keyservers.net --recv-keys F186197B

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Discuss September 2015