CentOS is a Linux distribution standing for "Community ENTerprise Operating System" and is a rebuild of "Red Hat Enterprise Linux" (RHEL). The "CentOS6" tag refers to versions 6.x of CentOS.

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744 views

Failing to mount root from ramdisk while PXE boot

I have a working TFTP/DHCP PXE boot environment where I've already booted some images successful. Now I built an CentOS 6.5 diskless image and this one is failing booting with the following error: No ...
3
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89 views

SSH - 1s hang at “Entering interactive session” (Not DNS; possibly SELinux related)

I'm having an issue on CentOS 6.7 where SSH logins are 1s more than any non-6.7 machines on this network (e.g. 7.2, 5.11). Running debugging on the client side showed the hang at "Entering interactive ...
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55 views

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 ...
3
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104 views

Centos 6.6 ignores inittab – always boots to runlevel 3

Well, like the title says, I have inittab set to id:5:initdefault but it always boots to runlevel 3 (as confirmed by "runlevel" and "who -r") Typing 'init 5' brings the GUI up. Also, appending '5' ...
3
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1k views

Unable to change vm.max_map_count for elasticsearch

Prehistory I have elasticsearch and SugarCRM7 running on CentOS 6.5. Every day I face the same problem: java outOfMemory error. That happens because of small vm.max_map_count value, 65530 only when ...
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14 views

IBM's iSeries ODBC driver not sending any traffic when invoked via isql or otherwise, getting [08S01][unixODBC] and [ISQL]ERROR: Could not SQLConnect

Note: I've replaced IP addresses, database names, and server users with examples. That shouldn't affect anything. The Setup I've installed unixODBC (yum install unixODBC) and IBM's official ...
2
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150 views

How to emulate union mount behaviour with LVM in CentOS?

In short, I want to create a system restore image. My idea with AUFS is like the image below Now, as I require this mount setup at boot-time, I don't think I can do it with fuse and will require AUFS ...
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253 views

High network softirq requests for kernel 3.10 under a lot of traffic

We have been experimenting rolling out 3.10 series kernel that's provided by centos via the centosplus repo for v6. We have been noticing something interesting where under the same load the load for ...
2
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565 views

lvs with NAT routing - horrible performance to one real server

I have an LVS setup with NAT routing and two real servers (as an FYI, we're only routing http on tcp port 80). Currently requests to real server A respond just fine, with page load times of 3-4 ...
2
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724 views

Configure PolicyKit to allow non-local user to perform administration tasks that require authentication

On linux with policykit, if you try to use most GUI-based administration tools over a remote connection, they refuse to authenticate. I believe this is an issue with policykit (for example, ...
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930 views

Adaptec 5805 on Centos 6 IRQ 16 error

I'm having a problem with Adaptec 5805 raid card http://www.adaptec.com/en-us/support/raid/sas_raid/sas-5805/ (with two SAS discs in raid) and Gigabyte motherboard GA-H67A-D3H-B3 ...
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13 views

PostFix/Dovecot new installation on Centos6

I have installed Postfix and Dovecot on my server. It seems to be mostly working - I can send mail from my account to a remote account no problem. My problem is receiving it. When I send an email ...
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33 views

/dev/console terminal for startup service on Centos 7

I am working on a system running Centos 7 and I'm pretty new to Linux in general. I have a task to re-implement some startup services that was supported automatically by 3rd party tool in our previous ...
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101 views

curl: (1) Protocol “https” not supported or disabled in libcurl

I've a CentOS6 vps on which O trying to access https url through curl it gives not supported error # curl https://google.com curl: (1) Protocol "https" not supported or disabled in libcurl Anyone ...
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37 views

pureftpd conneting with ftp on terminal but not filezilla

I have a dedicated server with WHM which have installed pureftpd the problem is: $ ftp site.com works alright I can use dir command and see my file list however with filezilla or others like ...
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11 views

Alternative ways to detect hung OpenStack/Linux services?

I have noticed on some of my linux servers that a linux service will be hung. The only way I know that it is hung is operations that rely on the service fails and when I restart the service it fails ...
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29 views

HHVM doesn't start and no error message

I've installed HHVM 3.2 on Centos 6.5. And also installed mod_fastcgi. But when I try to start hhvm nothing happens. I don't see any error message. I have to press ctrl + c to interrupt. Where can I ...
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59 views

Can't access to phpBB admin after fresh install on a CentOS server

After a fresh install straight I can login to the admin, but when I logout and try to login back I can't. No problem to login anytime to the board, to the users interface... When I click on ...
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61 views

Kerberized NFSv4 without creating new service principals

I need to deploy NFSv4 with Kerberos authentication in an existing AD environment, however, it must be done without making any changes on the KDC... So I figured, I would need to reuse host ...
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206 views

CSF+LFD not blocking brute force on xmlrpc.php on Wordpress site

I have just installed csf+lfd on my rackspace cloud server (a vanilla LAMP stack running centos 6.7). I only tweaked a couple of settings in the default csf.conf file: the ports allowed in TCP_IN and ...
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64 views

Exim Email hacked or Backscatter attack

I have undertaken an Exim Server for a client, this morning I Woke up to about 100 bounce backs from Hotmail with the following: "Undelivered Mail Returned to Sender" Googling I have come across ...
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225 views

Openswan through Amazon VPC Routing to Office Network

Were trying to create a road warrior VPN network. Since the internet in our office is slow, we are running it through a VPC with a replicated AD and File Server. There is currently an Amazon VPC VPN ...
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907 views

Failed to connect to socket /var/run/dbus/system_bus_socket: No such file or directory

My server on Centos 6.6 went down Phusion Passanger refuses to start of with following error: stdin: is not a tty /etc/init/delayed_job.conf: line 7: description: command not found start: Unable to ...
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491 views

Circular directory structure

I'm having an issue with a circular directory structure warning produced by du and find on my CentOS servers. I have two FreeNAS servers exporting several datasets via NFS which are mounted on the ...
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61 views

Mounted with bind folder doesn't appear in FTP client if mounted a folder in a volume

I mounted an external folder (from outside the ftp folder) in the ftp folder with mount bind parameter this way: mount --bind sourcefolder destinationfolder The folder is correctly mounted and I ...
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345 views

Installing php-mysql on centos 6.5 fails due to conflicts when percona client 5.5 also installed

Some background: I'm writing a Chef cookbook to set up a LNMP stack for local development. It requires the php-mysql library for PHP 5.4 (using the php package). We're using the yum-remi repository ...
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33 views

Routing private IPv4 addresses internally

I have the following set-up involving two KVM hosts and numerous virtual machine guests on each. The guests communicate to each other on both hosts via [192.168.216.0/24]. [192.168.216.42] is ...
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759 views

CentOS 6: Apache 2.4 drop-in replacement for Apache 2.2 via yum?

I've a CentOS 6.6 installation with the stock Apache 2.2 package. I need to upgrade it to Apache 2.4, but I want a true drop-in replacement for the installed package, not something that goes into /opt ...
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57 views

Rollout approach for centOS/RHEL linux servers to achieve centralised authentication through AD

We have 3 environments testing develop and production each having more than 40 Linux servers. Need to establish centralized authentication through AD for all these environment. Which is the best ...
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94 views

udev attribute cannot be set on boot

I'm setting up SR-IOV for my Intel I350 igb on CentOS 6.6 (2.6.32-504.el6.x86_64, udev 147) using udev. I have modified a rule I used in CentOS 7 (3.10.0-123.el7.x86_64, udev 208). When I do "udevadm ...
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77 views

winbind needs to be restarded after boot

Environment: Centos 6.6 Samba 3.6.23-12.el6 I have succesfully connected the server to an Active Directory Domain and I have configured it as a Samba File Server. It works fine as long as I reboot, ...
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345 views

MySQL 5.6 Community Server failed to start in CentOS 6

MySQL 5.6 Community Server failed to start on CentOS 6. Before, I have successfully installed mysql community server (file: mysql-community-release-el6-5.noarch.rpm) on my CentOS 6, the binary source ...
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588 views

CentOS won't reboot (shuts down but won't come back up)

I recently encountered a problem with rebooting on my CentOS 6.6 VPS (hosted with Media Temple on their DV Developer service). I discovered that I had some sort of memory leak a few months ago; since ...
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224 views

How to setup multiple OpenVPN connections on a server for a single localhost app to use on CentOS 6.5?

I have a scenario where I need to run several OpenVPN connections at one time and to allow a singular application to access each of these connections. How wold I go about starting up several ...
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456 views

Directory index full, is this fsck result OK?

I found these in my /var/log/messages: kernel: EXT4-fs warning (device md2): ext4_dx_add_entry: Directory index full! kernel: EXT4-fs warning (device md2): ext4_dx_add_entry: Directory index full! ...
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771 views

Strange requests with wrong server_name and port 25 in apache / php

If I try to telnet [myserver.mydomain.com] 25 I get Trying [ip number]... telnet: Unable to connect to remote host: Connection refused but still I get strange requests such as the following ...
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288 views

Nagios 3.5 can't send notification email despite nagios logs ok / centos6

I spent hours trying to make nagios send email notification. my contact configuration is quite simple : I juste have one : nagiosadmin, and he is the default contact. In /var/log/nagios.log, nagios ...
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198 views

Is this the correct way to enable ip forwarding per interface?

I do not want ip forwarding enabled for all my interfaces (I'm using Snort inline from this host and the IPS interfaces must not forward). I need ip forwarding enabled for for my KVM guests behind the ...
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246 views

CentOS disk check errors with “Unable to find the checksum in the image”

I'm using the CentOS_6.5_Final minimum install ISO. I've added kernel-devel to the Packages directory, and then used createrepo to rebuild the metadata. Creating the repodata when in the ...
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57 views

CentOS-Like configuration of Vim on Ubuntu

Whenever I use a CentOS System, there's always a pleasant configuration of vim which mainly does the following: Remembering position of closed files Colour mode (!!!) Bash has colours There's lots ...
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136 views

Upgrade Raid 1 to Raid 0+1 and bootloader issue

I am trying to convert my current RAID 1 to RAID0+1 and facing issue in installing bootloader - please have a look what i am doing. My current configuration is RAID1(2*10GB): [root@localhost ~]# ...
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0answers
278 views

ntpd -gq do not working on CentOS 6.4

when I'm running 'ntpd -gq' from CentOS 5.10 (i686) the time is synced, but in CentOS 6.4 (x86_64) the command gets stuck (I need to stop it using ctl+c). Any idea hoe to fix it? EDIT: iptables ...
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279 views

MAGMI fails while importing big chunks of records. Ideal Mysql configuration for Magmi

Configuration: Linux Centos 6, NGINX, Mysql We are trying to use MAGMI a common tool for mass importing of data in Mysql based on webbrowser. I run in an issue. As a try to import more than a small ...
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459 views

Confirm IPTables firewall settings for NFS v4 server?

This question has been asked here before but has conflicting and possibly outdated answers. It seems to depend on OS, version of OS, and version of NFS. On a CentOS 6.5 server, the default rules are ...
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459 views

pysqlite for python 3.3.5 on Centos 6.5

I have compiled python 3.3.5 from source in the /opt folder as follows: yum install sqlite-devel ./configure --prefix=/opt/python3 make make install ln -s /opt/python3/bin/python3 /usr/bin/python3 ...
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260 views

collectd: ping plugin fail randomly on medium/high number of hosts

I am trying to use collectd to monitor ping time and interface traffic of upwards of a 150 hosts, using the snmp and ping plugins (nodes are mostly routers). The servers reads stats (ping/snmp) and ...
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1k views

Join samba4 member server

I am installing Samab4-ad in a test environment, to prepare migration from Samba3. All is done is OpenVZ VEs running CentOS 6. I have successfully installed DC1 and DC2 using sernet-samba rpms ...
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7 views

IfModule directive strange behaviour

I've configured 3 virtual servers for Apache2 under Centos6. Each server config is wrapped inside IfModule directive like this: <IfModule mod_fcgid.c> Listen 15100 NameVirtualHost ...
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658 views

CentOS 6.5 Xen Virtual Machine Issue 'this function is not supported by the connection driver'

I am trying to segment my system into a number of virtual machines but just cant seem to get this to work. I think I am close but not quite there. I have install xen, virsh, xl etc and I am using ...
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1k views

dhcping “no answer” on CentOS 6.4

I installed a DHCP server (yum install dhcp) and this is my conf: # create new # specify domain name option domain-name "mydomain.name"; # specify DNS's hostname or IP address option ...