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 to start PV Xen Guest

I am new in Xen virtualization system and i am trying to learn everything about it so i can use it instead of Openvz In Openvz i can start and stop vps by running vzctl start <VID> vzctl ...
2
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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 ...
0
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1answer
18 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) ...
1
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1answer
15 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 ...
0
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0answers
9 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 ...
0
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15 views

CentOS: in which folder should I install Java JDK? [closed]

I need to install Java JDK on CentOS 6.7, from different instructions I can see that some install it to /opt/, some to /usr/share/ some to /usr/local/, and some to /etc/. Which folder would be the ...
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0answers
15 views

How much minimum memory do we need for a cPanel with low viewed sites? [duplicate]

I have a new VPS with 50GB disk and 1GB RAM, CENTOS 6.7 x86_64 kvm – server WHM 54.0 (build 8). I have a few sites only, where the most visited site has around 3000 views per day (all other sites may ...
0
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1answer
17 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 ...
0
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0answers
12 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 ...
0
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1answer
54 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
36 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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1answer
29 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 ...
0
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0answers
17 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 ...
0
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1answer
21 views

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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1answer
21 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 ...
0
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1answer
58 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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14 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 ...
0
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25 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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22 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 ...
3
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0answers
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 ...
0
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1answer
24 views

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 ...
1
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1answer
26 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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1answer
33 views

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 ...
0
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1answer
4 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 ...
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14 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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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 ...
0
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1answer
14 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 ...
0
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1answer
49 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. ...
0
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1answer
27 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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36 views

How to install ABAQUS software on Rocks cluster 6.2? [closed]

I created a new cluster with 3: one of them is frontend and two of them is compute. Note that I am new to Linux and Linux hpc clustering. I did all of the installing frontend and compute nodes, and ...
1
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1answer
38 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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21 views

Centos6.7: sqlite3.10 in server, but always the php config detecte the 3.6.20

I want to upgrade sqlite3 in centos6.7 server from sqlite3.6.20 to 3.10. I succeed to install sqlite3.10 in server, but always the php config detecte the 3.6.20 version !? sqlite3 data.db SQLite ...
0
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1answer
47 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: ...
1
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2answers
80 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 ...
2
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1answer
159 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 ...
0
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1answer
38 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 ...
0
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1answer
16 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 ...
0
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1answer
30 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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1answer
78 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 ...
7
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1answer
113 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 ...
0
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0answers
27 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 ...
0
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1answer
36 views

Change one IP without disrupting connections to second?

I have a CentOS 6 box that has two IP Addresses on one physical interface - One the IP assigned to the interface via the netconfig scripts, and the second a "virtual" IP assigned to the same ...
2
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1answer
41 views

Issue installing Ioncube with PHP 5.6.11 with Apache 2.4.16 on centOS 6.7

This is how I am compiling PHP 5.6.11 with apache2 2.4.16 on cenOS 6.7: ./configure --with-apxs2=/usr/local/apache2/bin/apxs --with-config-file-path=/usr/local/lib --with-mysql --with-curl ...
0
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0answers
11 views

Apache 2.2 Prefork generating many connections without load

I'm observing a problem where Apache 2.2 is starting up a tremendous amount of extra threads between 2:45 AM and 3:00 AM each night. I've gone through all the usual troubleshooting, and can't find a ...
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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 ...
0
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2answers
50 views

Can the server administrator browse date of the hosting based KVM Virtualization?

The hosting in https://www.digitalocean.com/ is based KVM Virtualization. If I purchase a their hosting , and upload private data, can the server administrator browse all my of date?
0
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1answer
121 views

CentOS - yum install - Fails: Protected Multilib versions: problems found libselinux

I have CentOS 6.5 I'm trying to intsall git via yum but getting an error while installing the pre-requisite packages. I don't need to but it doesn't hurt running sudo with root. Error message: ...
0
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0answers
21 views

Modern Node.js support/security on CentOS 6

I'm inheriting a legacy Node application that's running on 0.10/CentOS 6. I'd like to upgrade it to 4.2, but am running into a few issues. Previously, my sysadmin had been installing/updating Node ...
3
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2answers
622 views

TCP Messages Merged?

I have an application that sends 100 of 186-byte (excluding headers) TCP messages back to back without gap from host A to host B. I ran tcpdump to capture the packets on host A (where the sender is), ...
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2answers
44 views

How to find out who is sending email

I have a server which doesn't have much activity. Today, suddenly server load went higher than 12 which compared to its normal value(0.5) is way too high. I checked and found out that postfix is being ...