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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How should I provide a replacement for a package in yum?

I'm writing a spec file to replace a yum package with one from our own repository. The new package will be a drop-in replacement for the original. I thought the best way to do it would be to give the ...
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13 views

Making Linux processes schedule based on other prcoesses

I am using CentOS release 6.7. I have 2 services, say A and B. Service B is dependent on service service A. For example, if service A stops, I want service B to stop automatically. Similarly, if ...
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Confused about bottleneck on Mysql cluster 7.3 or apache2.2.x/php5.5

I have setup a mysql cluster 7.3.x with 2 Datanodes,2 SQL nodes and 1 Management Node in a LXD/LXC centos 6.7 containers and a separate Apache 2.2.x/PHP-5.5 web server. The website currently serves a ...
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Issue with libproc (version _3_2_5 not defined in file libproc-3.2.8.so)

There is an issue with libproc it seems. There is no mem usage or cpu usage info available. See: [root@server ~]# free -m free: relocation error: free: symbol kb_main_available, version _3_2_5 not ...
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1answer
77 views

Upgrading CentOs form 6.6 to 6.7

Having an issue upgrading a box from CentOs 6.6 to 6.7. Running yum upgrade does not, however seem to perform as expected in that is does not 'see' nor suggest to update to 6.7. Here is what I have ...
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CentOS 6.5 Protected multilib versions: kpartx-0.4.9-80.el6_6.2.x86_64 != kpartx-0.4.9-80.el6_6.1.i686

When I try to run "yum update" I get this error. But I only have the x86_64 version installed as shown by "yum list kpartk": Installed Packages kpartx.x86_64 0.4.9-72.el6 Available Packages kpartx....
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1answer
27 views

Dovecot/Sieve adds extra / in file path

I'm putting the finishing touches on a Postfix/Dovecot/Postgres server (before attempting to rebuild it from scratch based on notes alone), and I have everything working except for one thing I can't ...
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1answer
99 views

OpenVPN - how to make the client names visible

I am using openvpn. Once the clients are connected, I would like that they can be addressed by using the names instead of the ip addresses. e.g. instead of "ping 10.8.0.2" I can use "ping client-...
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15 views

Error Running pcp on Cent OS

I am installing pcp and pcp-webapi using the following command [vagrant@localhost ~]$ sudo yum -y install pcp-webapi It installs successfully, however when I try to start the service using sudo ...
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32 views

Centos 6 ssd mtip32xx driver command(s) timed out: tagmap

We have some servers with Centos 6 with "Micron Technology Inc RealSSD P320h" ssd drives. We have noticed in the kernel log Feb 11 09:47:32 hostname kernel: mtip32xx 0000:47:00.0: 1 command(s) timed ...
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83 views

Internal DNS for internet access

I have configured a internal DNS for my office network using BIND on CentOS6 ... The problem I am having that when I use that DNS server as a primary DNS my entire network loses internet connectivity ...
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34 views

Deleted an error log and it won't regenerate

I'm a novice and hoping that someone with more experience can help me with this. I am running a VPS with CentOS 6.7 and nginx. The error log was getting very large and I was worried it would take up ...
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30 views

Gluster for replication/propagation

Say I have a bunch of servers that access a gluster mount to serve files via http. Files are sourced internally, and are copied from an internal server to the gluster mount on one of the download ...
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1answer
61 views

httpd reload as second command in bash fails

I am trying to run a command that carries out one action, to renew a certificate, and then reloads Apache. To do this I am running the following: sudo /home/ec2-user/letsencrypt/letsencrypt-auto --...
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1answer
144 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 ...
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77 views

Geotrust SSL certification issue

I have an issue with curl (Centos 6 env) does not recognize Geotrust intermediary certificate: * Trying 192.168.6.6... connected * Connected to composer.graymatter.co.uk (192.168.6.6) port 443 (#0) ...
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123 views

SSD fstrim on CentOS 6.x with software raid5

I have some CentOS 6.x servers. They have software raid1 and fstrim works well there. On one of the servers, I decided to do software raid5 and ext4. I can mount it with discard and there is no error ...
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59 views

Disable USB Drive Auto Mount in Gnome (Centos 6)

I would like to disable automounting of USB removable media on Centos 6 with Gnome. I have tried configuring HAL and setting the appropriate keys in gconftool-2 according to this procedure. Although ...
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49 views

Check If I/O causing high load average

I wants to understand how to measure if I/O is causing load average high and how to calculate optimal and critical I/O value. Because sometime there is a load spike on my server but other ...
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23 views

mount -o loop hangs

mount -o loop /example/example.img /mnt hangs for hours in dmesg only: ext3_orphan_cleanup: deleting unreferenced inode 104502 /var/log/messages kernel: < inode 10 inode 10 inode 10 inode ...
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108 views

high mysql CPU usage more than %1500 on centos 6

I am running a high traffic websites on a Dedicated-Virtual 24GB RAM CentOS server hosted by the planet. Very often the server dies because of high CPU usage (%1500) When i check the running ...
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1answer
57 views

How can I close httpd open conncetion? [closed]

I have a lot of open connection of httpd and ram usage, how can i solve this?
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43 views

Is there any way to salvage data from a 'broken'? SSD on Linux?

Where to start... So I have three dedicated servers hosted overseas. All three are running CentOS 6.7, two are used for webservers while the third is used as only for MySQL databases connecting to ...
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20 views

Assign a large subnet of IPs to KVM Guest VM

I have KVM host node running a few VMs. I create them using SolusVM panel, however they don't have an option to add bulk IPs in one shot to a guest VM which is silly. I'd like to know how I can add a /...
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Installing development tools packages error Centos 6.6

I'm trying to install curl-devel package as a prior step to installation of git 2.x.x: yum install curl-devel But I get many errors like this one: Error: Package: gcc-c++-4.4.7-4.el6.x86_64 (@...
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31 views

CentOS 6 ClamAV scan unexpected results

I am trying to scan whole server with below command using clamav. However I already installed Malware detector. The server scans for upto a minute or two and found some unexpected scanning results ...
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101 views

Heavy load (100% ni) and CPU load average is 42.61, 42.24, 42.23

Machine: 8 Core processor with Centos 6.7 top command result I am using node.js, PHP-FPM, NGINX, Redis, MongoDB. I have checked with stopping all services created my me and PHP-FPM, NGINX, Redis, ...
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70 views

unixODBC on CentOS 6.7 with PostgreSQL 9.3

I am attempting to connect to a PostgreSQL 9.3 database on a Debian machine, more specifically an Ubuntu 14.04 machine using unixODBC. I am able to connect via the psql command using the same user ...
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72 views

How to safely move /tmp directory to a new directory with same name and dedicated mount point?

I have created a new /tmp.new directory with dedicated mount point. I want to use that one to replace /tmp without dedicated mount point. I would like to use the commands of mount --bind, mount --move ...
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66 views

How to submit ABAQUS job on Rocks cluster?

I created ROCKS6 cluster and i installed ABAQUS on my cluster and it works well on frontend, but i can not submit job on my 2 other compute nodes. I just want to run ABAQUS on this cluster (frontend ...
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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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OpenLDAP Filtering Users that are part of Groups of Groups

LDAP Configuration: MemberOf Overlay is enabled Users are part of an organizationalUnit called People. Each user is a "memberOf" a role. For example, a user in their role at a company is a "...
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30 views

how to protect high-numbered ports as if they were well-known

Basically, what I want is the opposite of this. I want to be able to bind a service to a high-numbered port with the peace of mind that comes with knowing the O/S is treating that port the same way it ...
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How to increase boot disk space?

While creating a compute engine in google cloud , I assigned persistent disk as 50 GB. However my local disk shows as 10 GB , which is almost full. Help me increase this disk space. guide me how ...
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1answer
7 views

Trying to get property of non-object in advagg_font_admin_settings_form()

I enabled the module Advanced CSS/JS Aggregation (advagg) 7.x-2.17 on Drupal 7 and now in my admin page admin/config/development/performance/advagg/font I see a warning: Trying to get property of non-...
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24 views

Maria db Optimization and performance

I have a dedicated server comes with 8 x 3.3GHz cores, 16GB memory DDR3, CENTOS 6.7 64 bits, Apache 2.2.9, PHP 5.6, im running a php applications that needs a lot of connections with maria db version ...
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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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31 views

Pass ethernet interface to iptables rule in ansible playbook

I'm writing a pretty simple ansible playbook for setting up our iptables firewall in centos. Here is the playbook I wrote: --- - hosts: test remote_user: deploy sudo: True tasks: - name: Get ...
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1answer
72 views

SecChrootDir Jailing apache 2.2.X on Centos 6.7

I was trying to do apache jailing on centos 6.7 with modsec. I already built everything even the jail directory and remodeled the config files. httpd(apache) says it started nicely, however its dead. ...
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79 views

installing ruby 1.9.3-p194 using rbenv on centos 6.7

I'm moving a Ruby/Rails app to a Centos 6.7 server (from Ubuntu) and am installing ruby via rbenv. I run rbenv install -v 1.9.3-p194 and it will start to compile but the build fails. The build ...
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99 views

Best route for setting up VLAN tagging on CentOS

Lately, I have been working to configure a centos65 server to enable VLAN tagging, this server is going to act as VM Host (kvm). On the network-switch level, the ports were configured to enable ...
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96 views

can't access my dedicated server via ssh Permission denied (publickey,gssapi-keyex,gssapi-with-mic)

I can't access my dedicated server via ssh this's the result of "ssh -v user@server-ip" command line: OpenSSH_6.9p1, LibreSSL 2.1.7 debug1: Reading configuration data /Users/mac/.ssh/config debug1: /...
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813 views

Install sqlite latest version on Centos6.7

I'm trying to install the latests versions of sqlite (> 3.7.5) under Centos 6.7. So when I launch install command : yum install sqlite I get the following Message : Package sqlite-3.6.20-1....
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176 views

Channel all the traffic on an IP to a VM

Situation: I have a dedicated Server (CentOS 6) with couple of VMs(Cent OS 7 and Windows Server 2012 R2) in Virtual Box. Few applications are running in windows and reachable from the Main IP(X.X.105....
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132 views

SecRuleEngine Off not working on a single domain in virtual host

I have modSecurity installed and working on a server with multiple hosts and I want to disable some rules for one host only. This is what is what I put in the virtual host file: <IfModule ...
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43 views

Xen domain windows 2012 r2 - cant add usb

I have xen 4.4.3-9.el6 on CentOS: 6.7 (Final) Problem is I cant add usb devices to my windows 2012R2 domain; If I usexm usb-add demo_win2012_r2 host:0529:0620: I can see my device in windows but it ...
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89 views

How can I install Development Tools via vagrant and ansible on Centos 6.7

I get this error when running my first ansible playbook (i.e. I am not familiar with ansible yet) TASK: [Install packages] ****************************************************** failed: [default] =&...
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105 views

Centos clear swap usage

I got nagios monitoring and it is picking up high swap usage on a specific server. The user is using some application which triggers the high swap. Even after they quit the application, top still ...
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185 views

LUKS Error During Boot

I only see this error on the console during the boot process of virtual machines we create. EDIT: 2/5/16 - I see it on some bare-metal installations, too. (It does proceed to boot completely.) I ...
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63 views

issues with svnserve using ldap and sasl

I am trying to setup SVN's svnserve server using ldap and sasl to authenticate users and to encrypt data but I come across the following issues: /var/log/messages error or warning when I execute ...