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Questions tagged [centos6]

CentOS was an Linux distribution standing for "Community ENTerprise Operating System" based on "Red Hat Enterprise Linux" (RHEL). The "CentOS6" tag refers to versions 6.x of CentOS. CentOS 6 was released on November 27, 2011 and reached End Of Life on November 30, 2020.

CentOS was an Linux distribution standing for "Community ENTerprise Operating System" based on "Red Hat Enterprise Linux" (RHEL). The "CentOS6" tag refers to versions 6.x of CentOS. CentOS 6 was released on November 27, 2011 and reached End Of Life on November 30, 2020.

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Filesystem passthrough functionality in Centos 6.2?

I have a CentOS 6.3 machine currently running 2 virtualized CentOS 6.2 machines via KVM/QEMU/Libvirt. I'm trying to setup filesystem passthrough between the guests and the host. However the option is grayed out in the Virtualization Manager with the…
mm118
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CentOS iscsi initiator has session but there is no block device

I have installed the scsi-target-utils package on CentOS and I used it to perform a discovery. The discovery did give me an active session. I restarted the iscsi service but I do not see any new devices (fdisk -l). I see in /var/log/messages that…
jcalfee314
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CentOS disable filesystem check: superblock last mount time is in the future

I'm persistently getting the "Superblock last mount time is in the future" error when booting CentOS 6. I've seen other questions which ask how to resolve this error, but I know exactly why it's occurring: our development/testing VMs regularly have…
Zac B
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Interpreting cryptic kernel "page allocation failure" messages

I have a multi-user CentOS 6.1 database system running an application named ABC. The server is 64-bit, 8GB RAM and 6 vCPU (on VMWare ESXi 4). We get frequent dumps into the dmesg and the system logs detailing kernel page allocation failures. What…
ewwhite
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Why is dhclient issuing a unicast DHCPREQUEST every ~15 seconds instead of at T1/T2 timers?

I am running a CentOS 6.2 server as my gateway and firewall, while also providing some internal services. This is a setup I have had for years using various hardware and distributions (redhat based). Recently I have ran across an internet…
user1146281
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CentOS 6 Minimal or Hardened Install

I am working on building some new CentOs 6 servers and creating documentation for the installation of said servers. I would like to create a base CentOS 6 server install that would be light on the packages to reduce bloat by default. Additionally,…
John
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SSH sessions terminate abruptly with message: Corrupted MAC on input. Disconnecting: Packet corrupt

We have a Dell PowerEdge 840 Server running CentOS 6.0 64 bit with 2GB ECC memory. When any user sshs in, after some time the session gets terminated with the output: Corrupted MAC on input. Packet Corrupt This happens invariably. The ssh session…
rchhe
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Issue while using tune2fs

I have a server with a 3TB disk attached. I want to reduce the reserved blocks using tune2fs. Reducing the default 5% to 1% allows me to get a lot of extra space. Before applying in real server, I have tested in my test environment, Before :…
antony_sebastian
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Installing yum packages on airgapped (offline) CentOS 6 system

I have a CentOS 6 system which, for security reasons, is airgapped. It may have never been connected to the internet, and if it has, it hasn't been updated in a long time. I want to put all the .rpm packages on a drive so that they can be installed…
DeusXMachina
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Disable internal Intel X710 LLDP agent

We do special hardware configurations that require the heavy use of LLDP. We have a few new racks of servers that all use the Intel X710 10Gb network card. LLDP suddenly stopped working. Our implementation of LLDP is simple. Enable LLDP on the TOR…
Jim
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Is there a linux monitoring utility for Dell PERC H700?

I'm looking for a utility to monitor my RAID 5 setup, the card is a Dell PERC H700 with the following chipset: [root@example.net ~]# lspci -v|grep LSI 03:00.0 RAID bus controller: LSI Logic / Symbios Logic MegaRAID SAS 2108 [Liberator] (rev 05) The…
angelcool.net
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Is it possible to increase the rate at which ntpd updates the system clock?

We have some hosts that have gotten out of sync due to ntpd being mis-configured, with an ntp server that was unreachable. Our clocks on some hosts (CentOS 6) are now upwards of 30 seconds off (in the future it seems, for most of these). It looks…
MrDuk
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Low Entropy on Container

I am thinking my entropy level may be low? $ cat /proc/sys/kernel/random/entropy_avail I am around 132-178 on average. Pool size is default 4096 (this is a container on a virtualizer by the way). I also have ran: $ cat /dev/urandom | rngtest -c…
Gordon Snappleweed
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sftp server chroot initial directory

I have configured an sftp server with chroot and it works fine, the only thing that is bothering me is the initial landing directory, since the sftp user does not have write permissions in the landing folder he has to go to a folder named after his…
Carles Estevadeordal
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free shows more memory used than top process total

UPDATE: This was being caused due to a known issue with nss-softkn. See this article: https://www.splyt.com/blog/2014-05-16-optimizing-aws-nss-softoken When I run free -m from my centos 6.5 box I am seeing that I only have around 1400 mb of…
ipengineer
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