CentOS is a free (as in beer and speech) GNU/Linux distribution that is community driven and based on source code released from RedHat.

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Emails going to spam - Gmail / Hotmail / Outlook? [duplicate]

Right, sorry if I come across a frustrated but I'm actually raged that I haven't got this sorted yet. We moved to a dedicated server 2 months ago, from a shared server (which had no issues with ...
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1answer
35 views

Where does blkid get its information from? (/dev/block/ showing up in blkid output)

I have a CentOS 7 box that is acting very strangely. On first boot, typing "blkid" produces: [BurnC7 (2015-12-17 22:00:25) ~]# blkid /dev/block/8:3: UUID="c83f7479-4bc1-44e5-84ae-e38a83e75219" ...
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2answers
94 views

Install 32bit or 64bit Centos 7 on an Intel Atom?

I know there is no benefit to the hardware by installing 64bit OS on an Intel Atom 230 as its limited to 2GB ram. But on the software side, is most desktop software nowadays written for 64bit (Chrome, ...
2
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0answers
56 views

Certificate error with EPEL repository on CentOS6.7 using mirrors.fedoraproject.org

Can't update a CentOS 6.7 system with the EPEL repository configured. [epel] name=Extra Packages for Enterprise Linux 6 - $basearch ...
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1answer
30 views

Automatically update dns entry from CentOS vm

Hello guys (and girls). I have a new CentOS machine joined to a windows domain. This machine is created via powershell script on a 2012R2 failover cluster. At the creation time, the machines gets an ...
0
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1answer
40 views

Iptables stuck in D state all the time and causing server load

I am running iptables/csf on a centos 5.11 openvz vps. I can't start/stop/flush iptables/csf. Further looking into it I could see the csf is waiting for iptables. And iptables is stuck as you can see ...
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1answer
116 views

Does anyone install CentOS 6.6 or 7 on the HP ProLiant ML10 v2 before?

I want to ask that has anyone installed CentOS 6.6 or 7 on HP ProLiant ML10 v2 server yet? B/c on the HP official site didn't mention this server is supported by CentOS but do supported RHEL(Redhat). ...
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1answer
23 views

Puppet adds domain to the certificates

When as a root I run the following in my puppetmaster server puppet master --verbose --no-daemonize It generates the ssl certificates, but adds a domain to them. Which is the domain of my company ...
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0answers
36 views

Unable to get a xen vnc console on centos7

On a xen Centos 7 domU, I am unable to get a vnc console on xvc0. According to the documentation I have seen, this should occur automatically. What I see is anything but - console stays on hvc0. ...
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0answers
22 views

Kamailio 4.3 replecing opensips 1.11

We have a customized sip routing script in opensip 1.11 now for good performance and stability we are moving to kamailio 4.3. So here am facing some issues related to kamailio module and funciotns ...
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18 views

compiling php for apache

We are planning on upgrading Postgresql on one of our RHEL5 servers to solve a bug and wanted to upgrade php at the same time as it is something we have been wanting to do for a while. I have been ...
3
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1answer
41 views

Activate Intel VT-d in the kernel on CentOS7

Following many tutorials, they ask you to alter the grup file at the /boot/grup/grup.conf.. but in Centos7 there is no /boot/grup/grup.conf ... Activate Intel VT-d in the kernel Activate Intel VT-d ...
3
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1answer
220 views

HP DL60 Gen9 not booting installed OS

I have an issue with 2 HP DL60 Gen9 servers. They each contains 2 x 500 G SATA HDDs. I've used Intelligent Provisioning to create a RAID 1 array using the HDDs however, the first issue I noticed is ...
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0answers
47 views

CentOS 6 Xen Kickstart

According to the Xen4 CentOS QuickStart I need to enable the CentOS-Extras repository so I can perform yum install centos-release-xen. Since I have to do this on about 16 system I wanted to do this ...
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2answers
143 views

Logging not working on Centos 7

Long story short - somehow I managed to screw up rsyslogd service on Centos 7 server. Now only thing that appears in /var/log/messages is: Dec 14 22:13:27 {myhostname} rsyslogd: [origin ...
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1answer
32 views

CentOS 7 in an ESXi VM cannot see port 80 requests

I am running CentOS 7 in an ESXi VM. I have disabled iptables and selinux. And I am simply trying to run Apache on this version of CentOS 7, which I think is working fine: [root@am1 etc]# systemctl ...
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1answer
18 views

Checksum error while installing ambari

While installing ambari server,getting following error. yum install ambari-server -y Loaded plugins: fastestmirror, security Loading mirror speeds from cached hostfile Updates-ambari-1.7.0 | 2.9 ...
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3answers
513 views

Make Apache server only accept requests to domain rather than IP

I have a CentOS server running Apache 2.2.15. If the IP address of the server is 198.51.100.4 and I write in browser http://198.51.100.4 it goes on my website. I want to prevent this. I want my ...
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0answers
19 views

Server exploited, bruteforcing ssh machines. Exploit keeps coming back [duplicate]

a customer server of ours has been compromised. He was running an centos 5.9 machine, with plesk 11.5 on it. The hack/exploit was located in /var/html/ with files like: gosh.sh and encoded files ...
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0answers
100 views

Getting “Too many slots” messages on CentOS 7 running as a domU

I have some CentOS 7 guests (domU) running on some CentOS 5 + Xen 3.0 hosts (dom0). I'm seeing a lot of this in dmesg and /var/log/messages: Dec 11 13:33:50 appsrv01 kernel: net eth1: Too many ...
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19 views

Cron Reports Running the Script but no Results [duplicate]

RESOLUTION Per the marked duplicate question above, I checked the mail box for the user running the script. I found that a fatal error was occurring in the PHP script when run by CRON. The error was ...
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0answers
32 views

I can't send emails from PHP in my new server (but the same code was working in the old one)

Note: I have checked several possible duplicated answered questions but none of them are similar to this, I've been looking for information on the web for more than one week. I don't think that I have ...
0
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1answer
53 views

How can the hostname go missing on Linux?

How can a Linux server lose its hostname? This might be a loaded question, but there might be several answers. I just need to diagnose the problem I'm having, but I don't know where to start. ...
0
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1answer
38 views

Perform traceroute with specific outgoing IP

My server has multiple /24 subnets added via network-script files ifcfg-eth0-range0 Now one /24 subnet has connection issues and I need to perform a traceroute to see what's wrong. How can I have my ...
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0answers
16 views

Need to determine why my VPS rebooted - every few days, a sudden spike

Can anyone give some advice as to why my LAMP VPS server (running centos) reboots every few days? Well I know why - it's because the CPU and load suddenly spikes, but what causes the spike and what ...
1
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1answer
23 views

No control panel equivalent of exim /etc/mailips file for configuring IPs for each domain's outgoing mail?

I have a problem with outgoing SMTP mail being sent with the wrong IP address. I use exim for outgoing mail. I found a guide "How to manually configure Exim's outgoing IP addresses", which suggests ...
1
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1answer
36 views

Yum update complains about dependency (architecture mismatch)

I created a meta RPM package (say metapkg) that pulls all the dependencies I need on my system (CentOS 7). This package specifies the exact versions of its dependencies (without the architecture ...
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0answers
30 views

Bandwidth throttling

i am trying to limit download speed on my server only downloads i tried to use wondershaper and trickle but they both mess up with my upload speed tried everything to fix it but no success so is ...
0
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1answer
189 views

kmod-nvidia-340xx.x86_64 for centos 7 kernel 3.10.0-229.20.1.el7.x86_64

I just installed centos 7 upgraded, etc. >sudo yum update No Packages to Update >sudo yum upgrade No Packages to Upgrade I followed the instructions to install elrepo. When I try: >sudo ...
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0answers
27 views

Puppet device wildcard names for nodes?

I'm using Puppet's device management to mange some Cisco devices. Right now my device.conf looks like this: [someCity] type cisco url telnet://puppet:123456@10.123.1.1/ [someOtherCity] type cisco ...
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0answers
55 views

Hyper-V CentOS 7 guest has no keyboard in recovery modes

I am working with CentOS 7 as a Generation 2 guest on Hyper-V 2012 R2. Everything runs fine, but I am unable to control the guest when I boot it into certain systemd targets. For instance, if I were ...
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1answer
67 views

Wondershaper does not work

I am using wondershaper to limit download upload speed. What it does is, it limits download but then it blocks upload. I have an 1 gbit connection and I want to limit it's download speed to 500 mbps ...
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0answers
37 views

Apache times out unexpectedly ( despite setting Timeout in httpd.conf )

I've a PHP script (on centos, apache 2.2, php 5.4 & apache-mod-php5) that its execution takes about 2 minutes, but 1 minute after sending request, my connection to apache server times out and ...
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1answer
14 views

Cacti and MySQL Queries

I am new to Cacti and am interested in using it to perform some queries against a MySQL database. I have a software which logs an error counter into a MySQL table, and I'd like to be able to graph ...
1
vote
1answer
47 views

Enabling Nesting for Xen-in-Xen via Libvirt xml

I'm trying to get nested Xen-In-Xen via libvirt. Can someone confirm that adding hap and nestedhvm to the features element in the domU xml config is what is required to get nesting working? Am I ...
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0answers
64 views

Unable to start MySQL on CentOS

I've just installed a fresh version of MySQL on my CentOS machine. The problem I'm facing is that when I run this command: # service mysqld start I get in the console this error message: ...
1
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1answer
16 views

How do I see what nginx rewrite rules are being applied to a request?

I'm trying to debug why some rewrite rules are not working on my staging server, even though they work on my virtual machine. It seems as if when I restart nginx, it's not seeing my changes at all. ...
0
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1answer
20 views

Can not connect to VSFTPD on Centos 7.1

I no pro with this but I have managed multiple times to install vsftpd on centos 6+ and always got it working with or without TLS. But for 24 hours now I haven't been able to get it working on a fresh ...
0
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1answer
34 views

Unable to install a fresh version of MySQL on CentOS

These are the steps, that I followed: cd /etc/yum.repos.d # go to repositories rpm -qf mysql-community.repo # get the name of old repositories to delete yum remove mysql57-community-release # it is ...
1
vote
1answer
22 views

apache: absolute ErrorDocument relative /var/www/?

My apache VirtualHost contains an ErrorDocument directive: <VirtualHost *:80> ServerName test DocumentRoot /var/www/html/test/ ErrorDocument 404 /error/404.txt </VirtualHost> The ...
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0answers
24 views

Apache HTTP returns cryptic error messages

(Apache 2.4 / centOS 7) I am trying to start httpd service, following the following commands: [root@localhost ~]# service httpd start Redirecting to /bin/systemctl start httpd.service Job for ...
0
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0answers
20 views

Does Dovecot no longer work under xInetd?

I've been trying to get Dovecot to work under CentOS 7 with xinetd and I get errors such as: Error: net_connect_unix(anvil) failed: No such file or directory Fatal: Couldn't connect to anvil and the ...
0
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1answer
215 views

Puppet Device unable to get local issuer certificate

I installed puppet 4.3 and centos7 to use Puppet Device to manage Cisco routers. The server hostname is "puppetmaster" (by running hostnamectl puppetmaster) The centos server is running puppet master ...
4
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1answer
90 views

kswap using 100% of CPU even with 100GB+ of RAM available

I'm running a Centos 7 ESXi VM with almost 300GB of RAM and 24 vCPUs. The average load is 3 and apps almost never use more than 150GB of RAM. The rest of the available memory is used by Linux for ...
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1answer
22 views

External Drives on RAID/LVM configuration

I had 2 drives corrupted and now replaced with new ones sitting on RAID 0. After installing the new drives I have attached the 2 old corrupted drives via usb to retrieve data from them. These 2 drives ...
1
vote
1answer
39 views

Can't run puppet device (Could not request certificate: Could not write to… privatekeydir)

I setup puppet 4.3 on a Centos 7 server. This is a puppet master that is also running puppet agent. I am attempting to setup Puppet Device to configure a router. when I attempt to run puppet device I ...
0
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0answers
30 views

Amazon SES not sending mail on server

I have configured SES on my server. My product is running in Laravel Framework. MAIL_DRIVER=smtp MAIL_HOST=email-smtp.us-east-1.amazonaws.com MAIL_PORT=587 MAIL_USERNAME=A****************A ...
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0answers
21 views

Postfix + Dovecot - Internal Relay

I have a postfix/dovecot mail server setup. Mail is working perfectly. External relays are disabled. The issue is external servers can telnet to smtp 25 and spoof email from any valid domains hosted ...
0
votes
1answer
45 views

NTP not syncing automatically with my internal NTP server

I installed ntp on a centos server. I modified /etc/ntp.conf replacing the default server entries with one entry to my internal NTP server's IP (1.2.3.4 is the IP of the NTP server): server 1.2.3.4 ...
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1answer
72 views

How to create a Docker container of a specific CentOS major.minor version using YUM?

It is possible to create a Docker container using this script: [user@host]$ sudo sh mkimage-yum.sh -y /etc/yum.repos.d/epel.repo hello_container results in: + version=7.1.1503 + break + '[' -z ...