Linux is the generic term for a UNIX-like open source operating system based on the Linux kernel.

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1answer
15 views

atop configuration file location on CentOS 7.x

I have installed atop on my server using yum, its started and running. however I cannot find the configuration file on the server to tweak the settings. All mentions of it online point to /etc/atop/ ...
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votes
0answers
8 views

GnuPG on shared hosting server [closed]

I have a hosting server for my web projects, and would like to install GnuPG on it. The Problem: The shared server does not have Sudo, apt or yum My question: Is it possible to install GnuPG on my ...
1
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0answers
40 views

SSD Temperture Increases during idle

I have 4 Samsung 850 EVO SSDs in a mdraid 10 array inside a high performance simple NAS. running Centos6.8 minimal. I have found that the SSD tempertures start to increase on their own without any ...
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0answers
14 views

CISCO: Use Specific Outbound IP For Locally Initiated NAT-ed Connections

I have a CISCO 2911 router, multiple public IPs and few servers. I have setup my router (ROUTER1) to be accessible through internet-accessible public IP (lets say) 190.0.0.250 and its local IP to 10....
2
votes
2answers
47 views

Linux user without any filesystem permissions

I need to make a linux user for the sole purpose of an SSH proxy. Amongst other things, the user should not be able to go around exploring the filesystem or even access a shell really. Obviously I ...
0
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0answers
4 views

“Received: (from apache@localhost)” header on sendmail [duplicate]

Below are the headers of the email (sent to gmail) Delivered-To: depressionforteens999@gmail.com Received: by 10.13.223.151 with SMTP id i145csp761882ywe; Sun, 17 Jul 2016 17:33:34 -0700 (PDT)...
0
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2answers
31 views

Dovecot on CentOS 6 doesn't work after update

I recently updated CentOS to version 6.8 (Final). I'm not sure if then dovecot stopped working or a bit later. I see nothing in secure log on correct password and "failure" on wrong password. I never ...
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0answers
9 views

CIFS metadata caching?

I know my client is the only one reading and writing a certain SMB share. What can I do beyond cache=loose to enforce caching metadata? I have no control over the server. There's a certain directory ...
0
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3answers
67 views

Back up rented VPS that does not have that option

I'm currently renting a linux VPS from a host that doesn't grant the option to create a backup or snapshot. In my previous experiences with other hosts most of them had the ability to do so. And for ...
0
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1answer
60 views

Can't start any service after installing iRedMail on CentOS

I have attempted to install iRedMail on one of my servers. After reboot, I can't start any service anymore. [root@mx ~]# systemctl start httpd ** (pkttyagent:16323): WARNING **: Unable to register ...
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0answers
12 views

Issue with monitoring the IMM console [closed]

I have server 10.173.202.44 and next IP is 10.173.202.45 for IMM Console I need to monitor only IMM console through TSM(Tivoli) with port 427 and 5989. Just need clarification, for opening the ...
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0answers
8 views

How is MAC address loaded to ip stack in kernel? [closed]

I am now trying to find out how MAC address of network device is loaded to kernel. OS I am using is Cent OS 6.8 64 bit . I see that whenever device is inserted , kernel automatically recognizes the ...
29
votes
2answers
2k views

How to allow ssh to root user only from the local network?

I've installed Google-Authenticator on a CentOS 6.5 machine and configured certain users to provide OTP. While editing /etc/ssh/sshd_config I saw a directive "PermitRootLogin" which is commented out ...
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votes
0answers
18 views

Cannot connect to Apple APNs server [closed]

The server is: Ubuntu 12.04.5 LTS The firewall is disabled. I'm trying to connect to APNS with no avail. (e.g. telnet gateway.sandbox.push.apple.com 2195) Searching on the problem suggests a ...
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votes
1answer
28 views

!Linux standard path information, similar to windows path variables, like %AppData%, %UserProfile%, etc.?

Is there, in linux variables, or some other means to find per/system paths, similar to windows path variables, like %AppData%, %UserProfile%, %AllUsersProfile%, %ProgramFiles%, %SystemRoot%, %...
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0answers
13 views

device-mapper: table: 253:3: snapshot: Failed to read snapshot [closed]

I use Clonezilla to restore linux system, after system restore finish System fail to boot up shown following error message Reading all physical volumes. This may take a while... Found volume group "...
0
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0answers
20 views

Bind increases my outgoing traffic and bandwitdth [closed]

I'm trying to set up a DNS server for the website I'm building in a shared vps. I left bind running a few days back and left it that way. Today I realized that the bandwidth used today is 100GB out of ...
0
votes
1answer
24 views

Can't Install CentOS 7 - Black Screen

I'm attempting to install CentOS 7 on a new set of Supermicro Twin2 servers (motherboard model X10DRT-PT). I've attempted the install via a local USB drive as well as via virtual media mounted through ...
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votes
0answers
3 views

JDK6 SSH2 2048 bit key exchange [closed]

I am currently working in banking support project. The unix backend application currently support/hosted in jdk6. Currently the application send data another application using SFTP 1024 bit key ...
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votes
1answer
23 views

Core processes are started to run under another user, not root

I have added a new user as abc, with UID 0 and GUID 0 (as same as root. I know, it was a bad idea) Now, when I connect to ssh via root, it's shown as abc@localhost, not root@localhost. Also, all core ...
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0answers
2 views

How to send DHCP server a different hostname than the machine's static host name? [migrated]

I'm using an at-home-type wireless router as the DHCP server for my desktop, with said router's management console showing the host names of the connected machines. If I put send host-name "AAA"; ...
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0answers
16 views

mounted network disk with cifs doesn't allow to move created folders

I can create, delete and rename folder (as long, as it is stays on the same level) on an cifs connected network disk, but I cannot move them. When I try to move one dir inside of another dir, it gives ...
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0answers
33 views

How to forward traffic from A to B on the default gateway for sniff? [closed]

I have the following devices: A laptop (192.168.1.128) A Linux box (192.168.1.156) A router running OpenWRT(also the default gateway for the LAN) (192.168.1.1) Now I want to achieve the following: ...
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0answers
17 views

CentOS/RHEL Limit Bandwidth to specific IP

The scenario: We have a file server (local1). local1 is directly internet connected (no router/firewall in front). We have several remote VPS nodes (remote1,remote2,remote3). We use UDP (udt-...
3
votes
1answer
35 views

Linux SMB share - how to give access to Windows local system account?

I have a SMB share on a Linux host. To grant remote access to the share for a Windows user, one must create a new SMB user which has the same username, and same password as the Windows account. i.e. ...
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0answers
18 views

MySQL server connection error [closed]

Hi i am running a VM with Centos7. I am running a mysql server on it. It works fine for weeks. But now when i trying to connect it shows the error ERROR 2002 (HY000): Can't connect to local MySQL ...
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0answers
26 views

SNMPTT exec not working

We're using SNMPTT in a Nagios environment. My MIB works for all events, but 1. I can't figure out what's going on. When a trap comes in, I want it to execute a file, which will then handle the ...
0
votes
1answer
46 views

kdump isnt working on redhat machines

How to force Linux to crash: we installed the kexec-tools (kdump) on our redhat machines ( version 7.1 ) in order to capture problems by creating core file under /var/crash folder we check that ...
1
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2answers
104 views

Bash scripting error checking using word count and awk

Need a light on my script I am doing a word count on a variable get a 0 or bigger value but it seems the script is breaking at on this variable function count_check=wc -l $TABLE_CHECKS | awk '{print $...
0
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0answers
13 views

Cannot enable cgroup_enable=memory swapaccount=1 on GCE Debian Jessie instance

In order to support Docker memory limits / quotas I'd like to enable the cgroup_enable=memory swapaccount=1 Linux kernel command line options on my Debian Jessie Google Cloud Compute Engine ...
0
votes
1answer
21 views

Upgrading MySQL with YUM

I am trying to upgrade from MySQL 5.5 to MySQL 5.7 with yum (using Amazon linux AMI) When I do : sudo yum upgrade mysql No packages marked for update When I do : sudo yum install mysql ...
2
votes
2answers
77 views

how to configure the grub.cfg file on redhat 7 in order to boot from specific kernel

In Red Hat EL versions 5 and 6 we can easily to update the /etc/grub.conf in case we want to change the kernel by default variable For example , grub.conf on redhat 5 default=0 timeout=5 #...
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0answers
16 views

Ubuntu server, server cannot send data to client after a while : connection reset by peer [closed]

I have written a simple server program that accepts TCP connections. It work like a proxy server, client send a packet to the server and the server send data back to the client. I'm using C# and Mono ...
0
votes
0answers
28 views

Using ZFS with LXD [closed]

I am currently looking into using ZFS with LXD. I want to be able to mount a ZFS pool to an LXD container as a secondary storage much like adding a hard drive to a physical machine? How would I go ...
0
votes
1answer
62 views

Is it possible to run ntpd with a time that is intentionally distinct from system time? [duplicate]

For example, could I set the ntpd time five minutes ahead of the system time? I know I can set the time manually without running (or even installing) ntpd, but it's not obvious to me how to run ntpd ...
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votes
1answer
25 views

Is it possible to setup a Solaris AI on Linux? [on hold]

I'm trying to centralize OS provisioning for all our Linux and Solaris servers. Is it possible to set up a provisioning server for Solaris 11 from Linux?
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0answers
11 views

Virtual Host Proxy redirect error

I'm running Apache on a couple of servers. I'm trying to redirect 1 site from my main server onto another server on my internal network. On my main server I've setup a .conf file master.conf with ...
0
votes
1answer
102 views

Mount Block Device in LXD

I have been experimenting with LXD on Ubuntu Server 16.04 and i'm trying to figure out how to mount a linux block device from the host in the container. I was able to successfully add the device using ...
-1
votes
1answer
44 views

No package php5-gmp available

Alright, to use Blocktrail's API, I'm trying to install the gmp package of php using this command :- yum install php5-gmp This results to :- [root@dsfx ~]# yum install php5-gmp Loaded plugins: ...
0
votes
1answer
17 views

“Device is busy”, while trying to unmount with GParted [closed]

Every time I try to unmount my hard drive, it just comes up with this error message. I have tried 'lsof | grep /dev/sda1' and I have tried the fuser command, but it just causes my system to restart, ...
0
votes
0answers
11 views

Detect with PHP “Waiting for table metadata lock | REPAIR TABLE”

Currently had a situation on our Linux server where our cron jobs piled and caused a memory issue because the Mysql table was being prepared. Waiting for table metadata lock | REPAIR TABLE .... Is ...
3
votes
2answers
448 views

Remove filename with “-r” in linux [duplicate]

I am unable to delete a filename named -r with rm -rf -r Is there any special trick to remove it?
-1
votes
1answer
32 views

how do i block computer from accessing ip in url except 2 computers [closed]

Vesta cp is installed on top of centos server. I need to block all the users of LAN from accessing ip (192.168.80.2) except some.
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0answers
22 views

How can I troubleshoot server performance for a web crawler? [closed]

I run a self built web crawler on a number of cloud instances (10) and have an unexplainable limitation in throughput. I`ll try to articulate the problem the best I can... Each "node" can visit ...
1
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2answers
37 views

where are the /var/log/messages alert event levels error, warning, failed, etc. stored?

Is there a list of /var/log/messages event level keywords stored in a system file somewhere in CentOS 7 that would show all the possible "strings" to search for when grep'ing through /var/log/messages,...
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0answers
20 views

Ubuntu Print Server in Windows Environment

For my project at work, I decided to create a Ubuntu Linux 16.04 print server but it's in a Windows environment. I installed CUPS via apt and Samba via apt also. The few printers I have setup work ...
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2answers
27 views

Sending Red Hat audit logs to Windows Share

I am trying to figure out the best way to offload audit logs from a single Red Hat server to a windows share. What is the best way to do this without installing any additional software on the Windows ...
0
votes
0answers
22 views

Only get Command output through SSH Send

Right now I am going crazy about SSH Send and Expect. I am executing the following SSH command through the HP Operatons Orchestration SSH flow step. send send top -bn1 | grep "Cpu(s)" | sed "s/.*, *\...
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0answers
13 views

Configuring Bidirectional Host Based Authentication in SSH [closed]

I have 3 servers (Ruby, Sapphire, Onyx) that I have been trying to setup passwordless (host based) authentication between for all users. I've configured the machines to use host based authentication ...
0
votes
1answer
27 views

Exim server maillog are flood by spam attemps? [closed]

My log is flooded with those spam attemps and I wonder if there is a ACL can stop those attemps. maillog (this is just a sample, my log will be over a 1000 line in an hour) 2016-07-09 22:00:32 [...