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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CentOS network bridging and Xen

I'm using CentOS 6 and Xen 4.6 on a bare metal machine. I'm trying to install ubuntu as a guest but I fail in the networking section. (I use netboot image). I have two eths named eth0 and eth1. ...
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55 views

Failing to connect Azure CentOS VM via Sentora FTP

I created CentOS 6.5 and I installed Sentora 1.0.3 on Azure VM Service. But i couldn't make a connection with Sentora FTP account. I'm trying to connect Sentora ftp account with FileZilla. I get ...
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59 views

Fail2ban 0.9.3 not working on centos7.2

I'm really struggling with this. The default [sshd] jail works fine. Status for the jail: sshd |- Filter | |- Currently failed: 0 | |- Total failed: 0 | `- File list: /var/log/secure `- Actions ...
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42 views

cgroup same process with different resources

I have a Jboss application server installed through source and running multiple instances(say 3) of JBoss as a same user in a single machine on different ports. Using cgroups, I'm trying to do ...
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2answers
88 views

How have phpMyAdmin (with a Alias) with a virtual host subdomain of a different documentRoot

To increase security in my server I created an subdomain only for admin, like admin.domain.tld and usually i access phpmyadmin by going only at admin.domain.tld/mysqladmin as in config file: <...
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1answer
104 views

ntlmssp_handle_neg_flags: Got challenge flags[0x60898205] - possible downgrade detected! missing_flags[0x00000010] - NT code 0x80090302

I'm trying to access SMB/CIFS resource on NetApp, using following and getting error: $ cat /etc/redhat-release CentOS Linux release 7.2.1511 (Core) $ rpm -qa | grep ^samba- samba-client-4.2.10-6....
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2answers
100 views

Why does Debian have RPM and Yum packages?

I know that Debian comes with an awesome package manager called APT which is capable of installing .deb packages. I know that RHEL comes with a package manager called Yum and is capable of installing ...
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0answers
31 views

Fail2ban error 'database is locked' when trying to start / restart it

I am currently reinstalling fail2ban to have a fresh version, because i've modified it quite a lot of time since I installed it for the first time, and I wanted to default settings for it. Once ...
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1answer
89 views

Provision a virtual server within CentOS 7? [closed]

This may be a really silly question, but I currently have a dedicated server and I have an incredible amount of redundant hardware. I'd like to be able to provision virtual servers running various ...
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1answer
72 views

Unable to start cron service [duplicate]

Few days ago I added a cronjob using crontab -e which should run every 6 hours, however I noticed that cron job is not working. When I execute my script manually it works, and it should write some ...
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1answer
35 views

godaddy vps dns setting

I have goDaddy Domain with this dns record a @ 107.150.xx.xx 600 seconds Edit cname email email.secureserver.net 1 Hour Edit cname ftp @ 1 Hour Edit cname www @ 1 ...
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1answer
69 views

trouble deploying django under apache on centos with mod_wsgi

EDIT 2: I got this running mostly! It was indeed a SELinux issue. So most things work, I get a cannot write to a read only database error. And some of my things that seem like static are not found,...
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1answer
53 views

How can I connect a group of vms in Azure?

I have a number of Azure Linux VMs. I am able to ssh into all of them using the public azure connection info, however I am not able to ssh from one vm into another vm using the private info. I have ...
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0answers
67 views

Postfix: status=deferred (delivery temporarily suspended: lost connection while receiving the initial server greeting)

Good day all, I have installed postfix 2.6 on my centos and trying to sent emails through a smarthost, to which I can telnet on smtp port, and failing with subject error. My main.cf is as follows: ...
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0answers
121 views

Why and How to set Public IP on Loopback Interface

I been using this forums for many years and this is the first time im in need to open a question, i search across the internet but i could not get an specific and clear answer, probaly because i dont ...
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2answers
40 views

Postfix Catchall - Avoid Spam

I've 2 accounts on my CentOS server configured with catchall email accounts. Lately I've been receiving bounced emails with virus that were supposedly sent from my server account, Ex: somestragename@...
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1answer
43 views

CentOS 7 Virsh - Allow Non Sudo Users to Interface with QEMU / KVM / Virtual Machines

Is there a way to allow non sudo users access to KVM QEMU virtual machines in CentOS 7? I want to allow a non-root user to manage KVM guest virtual machines without having sudo access. Mainly, I'd ...
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0answers
56 views

Redhat 6.8 - Where to install php-mssql

I tried following tons resources online to install php-mssql on Redhat 6.8 by using the Extra Packages for Enterprise Linux (EPEL) repo and it says that "No package php-mssql available". I made sure ...
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2answers
65 views

Synchronize RPM repository atomically

We have a RPM repository (on a Centos 6 machine) that we need to push to another machine. So far we've been using rsync -av --delete to simply push the repo directory over the network. This makes the ...
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1answer
49 views

Apache Tomcat requires an abnormal amount of time to start in CentOS 7

I am experiencing a weird issue on a CentOS 7 virtual machine and I can't see what is causing it. I created the VM on Digital Ocean and set it up as follows: 1) modified /etc/hostname with ...
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0answers
11 views

centos 7 /etc/lvm/archive flooded

not sure how to track down this but /etc/lvm/archive is seeing multiple entries created per minute. there is no cron job set up to do such archiving. also other similar servers do not have this issue (...
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1answer
103 views

Trying to setup mail server, can't get ports (25, 587) to work

I've searched everywhere and I'm really struggling with this one. I think I've tried just about everything. Background info VPS with CentOS 6.7 Postfix 2.6.6 dovecot, amavis, mysql, fail2ban I've ...
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1answer
35 views

LVM file locking error after moving extents to new physical volume

On a CentOS 6.7 system, I started getting SMART errors on a disk that was part of a volume group under LVM. So I used the recommended procedure: add a new disk to the system, create a new physical ...
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23 views

We are constantly getting CPU Spikes and site slows down [duplicate]

Our website works fine and fast, then out of nowhere cpu spikes to 100% site becomes really slow and after 10 minutes it is back to normal, this is constantly happening. How would one diagnose this? ...
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46 views

Building CentOS kernel from RPM with patches (but missing files that are in the SRPMs)

I have a hardware system that I am running CentOS 7 on. I would like to add some patches to the default CentOS kernel, since I have some custom hardware to support, but I also want to track the ...
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1answer
22 views

Build rpm on CentOS for RHEL

I need to install some software which is not available pre-compiled on a client's RHEL Server. I decided to create a rpm for easier installation on multiple systems. As i have no RHEL subscription, ...
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1answer
272 views

CentOS 6 - libc.so.6(GLIBC_2.14)(64bit) is needed by

I running a web-server with CentOS6 for 5 years without problems and it suddenly started throwing errors on yum update. This is the output of yum update: libc.so.6(GLIBC_2.14)(64bit) is needed by ...
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0answers
31 views

CentOS passwd file error

A co-worker tried to change the home directory of our root user and should have entered: root:x:0:0:root:/var/www/vhosts:/bin/bash ... but instead, entered: root:x:0:0:root:/root:/var/www/vhosts ...
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5answers
70 views

How do I increase a partition size (that doesn't use LVM) without removing and re-adding it

I have /usr on a separate partition. At the moment, this is how the server is set up: [root@localhost ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/sda2 4.9G 329M 4.6G 7% /...
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1answer
52 views

How to import large mysql database (innodb , myisam tables) to MySQL NDB cluster

Mysqlcluster used:- GA 7.4, Centos 7 I have 30GB each physical memory in 2 datanodes and SSD 200GB each but the database size(cumulative size of multiple db's belonging to free radius ) is around ...
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1answer
85 views

Dedicated server with ssd best practice [closed]

I am getting new dedicated server with 240gb ssd drive and 2 x 3tb hdd. I am thinking to put OS on ssd, and then mount uploads dir in my HOME/USER/ directory to HDD. Or maybe vice versa? What is ...
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2answers
49 views

How to free some memory in Centos 7 with only VestaCP installed [closed]

I recently bought a server. I have Centos 7 64-bit on it, with VestaCP installed (with one wordpress blog added).. Only these things are installed, nothing else as per my understanding. However, my ...
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0answers
20 views

CENTOS: Openfire is running but cannot connect to Administration Console

I was trying to get into the Openfire Administrator Console but I didn't know the password.(the guy that set it up left the company and didn't tell anyone what the password was) I got onto the CentOS ...
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0answers
50 views

Haproxy and nginx rtmp

i am trying to use haproxy in front of rtmp nginx server it does connect but it does not play the video i have 2 servers 1 server is where rtmp nginx installed and second server where haproxy ...
2
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0answers
112 views

How to verify network quality before running important benchmarks?

I have multiple CentOS servers around the world. They all are running a PHP script that tests the latency of some services once per minute. The problem is that sometimes these servers have local ...
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2answers
52 views

How unlikely it is that 2 SSD disks in a RAID 1 crash and how to recover from it? [closed]

How unlikely is it that a mirrored raid of 2 ssd drives fail together. (Both sector 0) unreadable. Me is told that ssd generally never breaks. So that both break at same time seems unique. What ...
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1answer
41 views

How to get all SNMP items using zabbix?

Scenario: OS: CentOS 7.2 Zabbix version: 3.0 Trying to monitor some switches using SNMP protocol I'm able to monitor them without any problem, all items are working and everything is fine but ...
1
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1answer
110 views

Changing the IP of a vSphere guest VM using Ansible

I want to deploy a VM from a template on vSphere and change the new instance IP via Ansible (2.x). I've managed to clone the template with vsphere_guest module but I didn't find a way to change the IP ...
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0answers
19 views

SAVE default scope global nexthop in CENTOS 7

I have two internet connections from two different ISPs and I need to balance & failover the traffic originating to and from my network between the two ISPs. My settings: FIRST ISP (eno1): 152....
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0answers
15 views

Connection refused with both iptables and firewalld disabled on CentOS. Why? [duplicate]

My Rig Server A with Bacula Dir installed Server B with Bacula Client installed Both uses CentOS 7 Objective. Open port 9102 to be able to access Server B from Server A via Bacula Dir. The ...
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1answer
91 views

PPTP VPN connection, authentication failed

I trying establish VPN connection using PPTP on Centos 6. But receive error. Log file: May 11 22:50:55 server pppd[1069]: pppd 2.4.5 started by root, uid 0 May 11 22:50:55 server pppd[1069]: Using ...
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1answer
43 views

Not within allowed paths: /usr/bin/gpg / CentOS 6

Trying to use the PHP filter_var function, but am getting the following in the error_log when it executes: [Wed May 11 10:56:22 2016] [warn] [client 24.69.156.92] mod_fcgid: stderr: PHP Warning: ...
1
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1answer
62 views

How to set up an SMTP Relay Server

I have 2 servers (X and Y) and an SMTP server for sending emails. X needs to send an email using the SMTP server, however it cannot resolve the host for the SMTP server. This is inevitable and I need ...
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1answer
61 views

Why is my mail blocked by Gmail (Marked as spam)

Three days ago I have installed CentOS with Directadmin what I've received from TransIP. The mailserver is now working, configured DKIM, SPF, DMARC etc. There is only one problem... mailproviders ...
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1answer
166 views

Is it possible to monitor processes with Zabbix?

I've installed zabbix-server, zabbix-proxy and some zabbix-agents on some of my dedicated servers. Everything is working and I'm quite happy with everything but I was curious about this topic: ...
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1answer
63 views

CentOS Crontab Woes

I have a shell script that I'm looking to run daily, (to update CentOS and send out a confirmation email via SSMTP). The script is working ok, and sits in /etc/cron.daily, the problem is that it's ...
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14 views

Config Vestavp with Google App

My domain example.net is running Drupal CMS and using Google APP email service. It uses DNS management from domain registrar (just point A record to server IP and it's not using Vesta name service). ...
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13 views

Varnish cache configuration not detect language country

I have a website written in java, content is returned to users based on the national language eg: default is English site aaa.vn default, as in Vietnam, the aaa.vn/vn When do I use varnish proxy cache ...
2
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1answer
85 views

How to configure Apache “workers” for maximum concurrency

Hoping this is a good question and can be useful for anyone in a similar situation. I recently took over from a very senior Linux administrator in my company, and for the first time I've had to set up ...
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2answers
53 views

Unable to install pcapsipdump

I'm trying to install pcapsipdump but I get the error below when I try to make. libpcab and libpcap-devel are installed, which I did via "yum install libpcap libpcap-devel". I'm currently stuck on how ...