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Questions tagged [centos]

Questions specific to the CentOS Linux distribution. Use this tag if your question relates to how the CentOS distribution affects your problem; do not use it if you just happen to be using CentOS and your question is about a specific configuration detail or syntax.

4
votes
4answers
55k views

setting mysql root password in CentOS 7

How can I log into the mysql 5.6 command line client and reset the root password in Centos7? I read the following at this link, but it does not work: 1) sudo service mysqld stop 2) sudo service ...
14
votes
2answers
25k views

When exactly does tmpwatch clear out files I place in /tmp?

CentOS 6.x I'm confused on when exactly files I place in /tmp/ are deleted. /etc/cron.daily/tmpwatch has the following: #! /bin/sh flags=-umc /usr/sbin/tmpwatch "$flags" -x /tmp/.X11-unix -x /tmp/....
5
votes
2answers
1k views

What program specifically sets /var/log/boot.log to 644 perms in RHEL/Centos 6?

I've been assigned to lock down all /var/log files so that they cannot be read except by the root user. I've been stumped by the /var/log/boot.log file. It seems that after every boot the file no ...
2
votes
1answer
1k views

Authentication mechanism to connect to Windows AD in Linux?

My company has asked me to look into connecting our CentOS 7 instance's to our Active Directory to make it easier for user management. I have so far looked at: Kerberos, doing it via command line - ...
2
votes
2answers
1k views

Renaming Files and Directories Recursively using rename/find

I started learning linux on vmware using centos 7. I created an image directory and several layers of files and sub-directories in that folder. most of the names containing spaces. I want to use a ...
10
votes
5answers
127k views

How to undelete just deleted directory with “rm -R” command?

I deleted an important directory with rm -R command. This is an very populer host data. It was located /var/zpanel/hostdata/ayrintilih After remove ayrintilih directory has gone everything. I tried ...
3
votes
1answer
6k views

CentOS 7 - Using systemctl to start headless virtual machine hangs

I'm not entirely sure if what I'm trying to do can work. I would like to run a vbox virtual machine as a service and have it enabled on startup. Here is my .service script: [Unit] Description=...
2
votes
5answers
33k views

USB mount doesn't work on Centos 6.4

I have a problem. After an update, my USB drives are not mounted automatically and I'm unable to mount them manually... The output of my fdisk -l command is: Disk /dev/sdb: 15.8 GB, 15762194432 ...
1
vote
1answer
729 views

Saving process output to a file in systemd unit file

I created a systemd file unit (Centos 7) and I wanted to save the Python output to a file but the service won't start with the below code. [root@static ~]# cat /etc/systemd/system/pykms.service [Unit]...
41
votes
4answers
57k views

yum Error:rpmdb open failed

I'm trying to run yum update and I'm running this error: rpmdb: PANIC: fatal region error detected; run recovery error: db3 error(-30974) from dbenv->open: DB_RUNRECOVERY: Fatal error, run ...
31
votes
7answers
51k views

Limiting processes to not exceed more than 10% of CPU usage

I operate a Linux system which has a lot of users but sometimes an abuse occurs; where a user might run a single process that uses up more than 80% of the CPU/Memory. So is there a way to prevent ...
17
votes
3answers
72k views

How to set the fully qualified hostname on CentOS 7.0?

How do I set the fully qualified hostname on CentOS 7.0? I have seen a few posts online for example using: $ sudo hostnamectl set-hostname nodename.domainname However, running domainname returns ...
19
votes
3answers
27k views

What's the quickest way to find duplicated files? [duplicate]

I found this command used to find duplicated files but it was quite long and made me confused. For example, If i remove -printf "%s\n", nothing came out. Why was that? Besides, why they used xargs -I{}...
8
votes
3answers
45k views

PHP 5.5.13 on CentOS 6.5 with yum

I've got problems with installing PHP 5.5.13 (last stable build) on a CentOS 6.5 (64 bit) machine, through yum. It is not a part of the CentOS, EPEL or REMI repos as far as I can see. I get 5.4.29 ...
14
votes
4answers
29k views

How do I combine two logical volumes that reside on a single physical volume in LVM?

I have two logical volumes, one is mounted as /, the other is mounted as /home. I want to combine them, because the / volume is constantly running out of space. (Yes, I know what's using all that ...
21
votes
8answers
103k views

CentOS 7 Installation Failed

After hearing the news that CentOS 7 had been published, I decided to install it on my computer. I downloaded the ISO image from the CentOS official website (the one named CentOS-7.0-1406-x86_64-DVD....
14
votes
2answers
86k views

Change sshd logging file location on CentOS?

How do I change the sshd logging file location on CentOS? sshd logs to /var/log/messages instead of /var/log/secure. How can I change the setting so sshd will stop sending logs to /var/log/messages?
10
votes
5answers
99k views

network.service Failed to start LSB: Bring up/down networking - Centos 7

I am experiencing an issue on Centos7 when attempting to start the network service. I receive the below error message. Failed to start LSB: Bring up/down networking The issue arised when I realised ...
17
votes
3answers
61k views

tomcat 8 will not start after initial install

I am trying to install tomcat on a new CentOS 7 virtual machine. I successfully installed apache httpd, and am able to get the apache test page when I type the ip of the virtual machine into a web ...
9
votes
2answers
82k views

How to upgrade Apache 2.2.15 to 2.4.4 in CentOS

I want to upgrade Apache from 2.2.15 to 2.4.4 in CentOS. Do I need to download update files to a folder and update Apache? Is this even possible?
19
votes
7answers
8k views

Is there a difference of stability between Linux distros?

I've using Debian since 2010 for some home purposes and it has been stable. Is Debian still a good option if I need a server for heavy network, cpu, disk and memory usage? Last month I listened to ...
12
votes
2answers
24k views

How to tell rsyslog to create log file if not there?

Default behaviour by rsyslog is to append traces to an existing log file. Now, I've seen (CentOs, Scientific Linux) that when rsyslog is already running, you delete the log file (e.g. the one ...
9
votes
2answers
19k views

Use inotifywait to move file when it loads in dropbox folder

I'm trying to find a way to immediately move a file to another folder as soon as it appears in my dropbox on CentOS. I have scoured the internet for some clues but I can't get any further than the ...
8
votes
1answer
8k views

When using 'yum list available' why are some entries in blue?

Using iTerminal on Mac OS X 10.8 to connect via SSH to a CentOS 6.4 server, running yum list available will show a list of packages available from the various repositories on that machine. Some of the ...
8
votes
3answers
7k views

How to execute a script on gdm login automatically for all users?

What file should I modify to execute some instructions when any user logs in through gdm? I tried /etc/bashrc but that is executed ony when starting bash (and each time an xterm is open). I'd like to ...
7
votes
2answers
5k views

How to permanently disable root-password prompt for recovery mode, RHEL7

Note: I asked a similar quesiton concerning version 6 of these bundles here. Note that 7 uses systemd and may have a different implementation In the rare cases that a RHEL or CentOS 7 system is ...
6
votes
1answer
8k views

How to copy SELinux context from one directory and apply it to another directory?

How can I copy SELinux context from one directory and apply it to another? Example use scenario is when creating a new local user outside of the default /home path, like this: $ sudo useradd -d /...
6
votes
1answer
5k views

Wget and curl can work normally, but ping fails

When I ping www.google.com and 8.8.8.8, I get no reply: # ping www.google.com PING www.google.com (216.58.221.228) 56(84) bytes of data. ( no response) # ping 8.8.8.8 PING 8.8.8.8 (8.8.8.8) 56(84) ...
5
votes
3answers
45k views

How to set JAVA_HOME correctly on CentOS?

I am trying to set JAVA_HOME so that I can install Apache Solr with the help of this tutorial. I am connected to my server using ssh with root user To allow the running sh script to install Apache ...
5
votes
3answers
6k views

SSH Login doesn't work using a key Without Password?

Agent admitted failure to sign using the key I'm working on centos6.5(32bit) and I have tried to ssh log in without Password Using ssh-keygen & ssh-copy-id? the steps that I have done: first I ...
4
votes
0answers
25k views

“xrandr: Failed to get size of gamma for output default” for Guest CENTOS 6.6, HOST OS Windows 7 enterprise

I am getting the following errors: xrandr: Failed to get size of gamma for output default Screen 0: minimum 640 x 480, current 1024 x 768, maximum 1024 x 768 default connected 1024x768+0+0 0mm ...
3
votes
1answer
5k views

Is there an easy way to check which program wrote to /var/log/messages?

Is there an easy way to check which program wrote to which file? I'd like to check which program wrote an error to /var/log/messages for example.
2
votes
3answers
47k views

How to create a bootable USB with Windows?

How would I go about creating a CentOS 7 bootable USB drive with Windows? I've read the howto page for it and it says that Unetbootin and Universal USB installer won't work for CentOS 7. In addition, ...
9
votes
1answer
23k views

chcon: can't apply partial context to unlabeled file while installing nagios with SELinux

I'm setting up Nagios core on CentOS with SELINUX=enforcing. I try to run chcon -R -t httpd_sys_content_t /usr/local/nagios/sbin/ as suggested in the manual, but I get this error messages: chcon: ...
9
votes
3answers
32k views

chcon: can't apply partial context to unlabeled file '/usr/sbin/xrdp'

Whenever I'm trying to execute this line to configure SELinux to install xrdp from this tutorial: # chcon --type=bin_t /usr/sbin/xrdp # chcon --type=bin_t /usr/sbin/xrdp-sesman I get these errors: ...
9
votes
2answers
4k views

Is it possible to create a directory and file inside /proc/sys?

I am running CentOS 6.2 and I need to create a subdirectory named "crypto" inside /proc/sys. Inside /proc/sys/crypto, I need to create a file named test which contains the value "1".
8
votes
5answers
7k views

Different list of installed packages reported by rpm compared to yum

I want to have Server B to have exactly the same setup as Server A. Server A and B have the same Arch and same hardware. My plan is to have a list of all installed things on Server A and install it ...
8
votes
1answer
10k views

yum install http - is this safe?

I am not very familiar with using yum to install packages. In a previous life I used apt. Currently, I am looking at some instructions to run # yum install http://example.com/package.rpm which ...
7
votes
3answers
2k views

Why does the i386 version of software get installed on an x86_64 system?

Why does the i386 version of most software get installed, along with the x86_64 version, on a CentOS 64-bit system? # yum install php-xml Loaded plugins: fastestmirror Loading mirror speeds from ...
7
votes
7answers
32k views

How do I upgrade OpenSSL?

According to these instructions: http://wiki.apache.org/httpd/NameBasedSSLVHostsWithSNI I need to use OpenSSL 0.9.8k or later (right now it's on 1.0.0c) to use name based virtual hosts in apache. ...
5
votes
1answer
3k views

rc.local with read will not echo key strokes

I'm using CentOS 6.4 and have a small problem with using read in /etc/rc.local file. It will allow keyboard entry but does not echo any of the key strokes during input. This is something that worked ...
5
votes
4answers
5k views

Need to upgrade svn on centos

I have an error when I run svn up svn this client is too old to work with working copy...please get a newer subversion client This is on centos. I need to update svn. How do I do this? [user@...
3
votes
2answers
21k views

Realtek r8169 not working in CentOS 6.5

We have recently purchased Gigabyte 990xe-ud3 motherboards. It came with Realtek LAN conroller. However with CentOS 6.5 it is not working, i.e. although it shows that it's connected with network, it ...
3
votes
2answers
2k views

How can I Forward a subDomain to a specific port?

My apologies if this has been asked before. I haven't found an adequate solution so... yeah. When a specific domain, "example.com" is accessed, I want it to act normally. In other words, it should go ...
3
votes
1answer
3k views

How can I have multiple email accounts from different domains using Postfix?

I just made it through this helpful article and successfully have my mail server set up with a single domain. What I'm wondering now is how I can be able to add multiple email account for different ...
2
votes
1answer
6k views

How to make modprobe nf_conntrack_ftp persist a reboot on CentOS 7 and firewalld?

I'm stumped. I've seen the related questions about editing /etc/sysconfig/iptables-config, but I'm running CentOS 7 (and webmin/virtualmin), which uses firewalld instead of iptables. How do I get ...
1
vote
3answers
4k views

How to install easy_install using non-default Python Interpreter on CentOS?

I have downloaded, compiled and installed Python 2.7 on CentOS. I would like to download and install easy_install (and pip) for it but I am a little bit confused as to how to do that. How can I ...
1
vote
1answer
19k views

How to install lsblk on CentOS 5

I'm more used to Debian so yum and CentOS is a little new to me. Apparently, lsblk is not available on this system. I'm trying to install it via yum with no luck. I just get "nothing to do". I ...
1
vote
1answer
7k views

run multiple instances of MySQL CentOS7

I need to have multiple instances of MySQL running on my PC. I did this: yum install mariadb-server mariadb => install mysql mysql_install_db --datadir=/var/lib/mysql => use mysql_install_db ...
1
vote
2answers
2k views

What is the chroot command used for when resetting a password in RHEL/CentOS 7?

I'm trying to wrap my mind around exactly how password reset procedures work in CentOS/RHEL 7 and I'm missing some fundamental knowledge. In several different examples I see that chroot /sysroot is ...