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

learn more… | top users | synonyms (3)

-4
votes
1answer
18 views

Does a tool like ansible make it possibly to get a secure server, without knowing a lot about security?

If I modified something like this into a server similar to the one described here with a minimal set of services (what you need for ssh, basically) would it be reasonably secure? sovereign: A set ...
-1
votes
0answers
12 views

Ubuntu 12.04 Won't Boot (hang) [on hold]

I am trying to boot my 12.04 ubuntu server, and I am getting hung on: Begin: Running /scripts/init-bottom ... done. This is in a VM on HyperV. I have tried fsck, tried going into recovery mode and ...
-5
votes
1answer
29 views

how to equal server time and php time? [on hold]

My linux server's time is 22:45 with command date. but with command date("F j, Y, g:i a"); is 8:45 in php. how is it possible? my real time is 22.45 how fix php time?
5
votes
2answers
121 views

Maximizing rsync performance and throughput - directly-connected gigabit servers

I have two Dell R515 servers running CentOS 6.5, with one of the broadcom NICs in each directly attached to the other. I use the direct link to push backups from the main server in the pair to the ...
0
votes
0answers
26 views

EC2 elastic IP not resolving to private IP on debian instance

I've read on many sites that the answer to attaching multiple public IP addresses to an EC2 instance (for SSL, redirection, whatever purposes) is to create multiple private IP addresses, attach ...
0
votes
0answers
9 views

Shrew Soft VPN Client 2.2.1 + how to configure user.c file for checkpoint VPN

I download the latest VPN client - ike-2.2.1-release from: https://www.shrew.net/download/ike. I need to install this VPN on my Linux Red Hat machine – version 6.3. I read that shrew VPN client ...
0
votes
0answers
12 views

docker: set hostname for container

I'm having trouble setting the hostname on a running docker container. I'm also having trouble understanding how to specify hostname after the image is started. I started a container from an image I ...
2
votes
1answer
30 views

SynFlood attack, spoofed IPs, syncookies mitigation

Due to a recent increase in SynFlood attacks on my company's systems i've been testing by Syn flooding the hosts myself to see how easy they are to disrupt, and the answer is 'quite easy'. By using a ...
0
votes
0answers
25 views

OpenSSL Ubuntu Won't Update No Matter What I do [duplicate]

I am at my wits end after three days of trying everything I can think of to update OpenSSL on this server to patch HeartBleed. I've tried apt-get dist-upgrade apt-get update apt-get upgrade openssl ...
6
votes
3answers
260 views

install application/http services to “/srv”?

I have been working with a team who used to install all the application and http services like apache or tomcat to the '/srv' directory. I suspect mostly in order to keep the installed services ...
0
votes
0answers
17 views

For an organisation what are the disadvantages of using servers that are located in another country [on hold]

For a company which does not have local servers, what are the disadvantages of using servers located in other countries? So say the company does have servers, and the company itself is based in ...
3
votes
2answers
90 views

Performance difference between ramfs and tmpfs

I need to setup an in memory storage system for around 10 GB of data, consisting of many 100 kb single files(images). There will be lots of reads and fairly periodic writes(adding new files, deleting ...
0
votes
0answers
19 views

htop NI value? VPS always crash [on hold]

I have a problem with my vps. It always crash, run out of memory and I'm getting internal service error many times while refreshing or surfing static html pages. I'm the only user and have no visits. ...
0
votes
1answer
17 views

OpenSuSE server in demilitarized zone can still ping internal network?

I don't know much about setting up DMZ but from what I read in the OpenSUSE docs, putting a network interface in the DMZ zone allows reaching it from both external and internal networks while ...
2
votes
1answer
30 views

Beowulf cluster storage setup [on hold]

I'm a Computer Engineering student working on a project with a Verari blade cluster, a bit outdated for today standards. I had acquired some Unix experience but I'm not an expert at all. This Verari ...
0
votes
2answers
23 views

Check badblocks on RAID-0

Without RAID-0, I usually check bad sectors using this command: fsck -yvckfC -E fragcheck /dev/sdX How to check bad sectors when the harddisk was using RAID-0? should I run it for each drive? ...
0
votes
0answers
16 views

How to correctly move application data to an attached disk on an Azure Linux VM

I have a Linux VM on Azure that originally came with a 30G OS disk. As I had an application that had accumulated a lot of data, I attached a new disk through the Azure Dashboard and here is how it ...
1
vote
1answer
17 views

Samba share with AD authentication is only authenticating users on some windows machines

I've searched high and low for help with this. What I've found is that most have given up. I have found that I can mount the samba share from a few different windows hosts with different users. ...
-2
votes
0answers
20 views

load balance without default route

I am trying to set up load balancing using static routes configured in the /etc/network/interfaces file which is as follows: auto eth0 iface eth0 inet static address 192.168.1.2 netmask 255.255.255.0 ...
0
votes
0answers
27 views

Interpretation of number of heads returned by fdisk [migrated]

Info about HDD: $ sudo fdisk -l Disk /dev/sda: 250.1 GB, 250058268160 bytes 255 heads, 63 sectors/track, 30401 cylinders, total 488395055 sectors Units = sectors of 1 * 512 = 512 bytes Sector size ...
-5
votes
0answers
29 views

get cpu usage with command and top [on hold]

I want get cpu usage. I used this command : top -bn1 | grep "Cpu(s)" | sed "s/.*, *\([0-9.]*\)%* id.*/\1/" | awk '{print 100 - $1}' But return 100%. I dont know what to do.
0
votes
0answers
24 views

udev set kdbrate settings on linux with console users issue [migrated]

I have a kbdrate setting as a udev rule for usb devices(keyboards and scanners that re repluggd in). kdbrate needs to be set by someone with /dev/port access which is the console user. The udev rule ...
0
votes
0answers
30 views

How to failover a Linux router? [on hold]

I have read some articles of router failover but none is solving my issue. My issue is offline failovering, that is, the failover machine is brought up only when a failure is detected. My ISP uses ...
3
votes
7answers
890 views

will hosting provider have access to my dedicated server?

I am looking to buy a dedicated server for my web application.But I am concerned about security to my application code and who can access to my server even dedicated server.As hosting provider ...
1
vote
2answers
23 views

Postfix sending and receiving in strange way.

I have an email server, running on CentOS 6.5, 32bit system, with Postfix and Dovecot running along all their dependencies. Let's assume my domain is www.anw.com I have created A record in this ...
-2
votes
1answer
29 views

Bash and cron error [duplicate]

The following cron job fails to execute. What's wrong with it? It works fine when I run it directly from the shell prompt. www-data@etl:~$ crontab -l SHELL=/bin/bash MAITO="" 0 5 * * * export ...
0
votes
0answers
19 views

iptables will only allow access to my website from external net [duplicate]

I am having an issue with my new Debian Router / Firewall. I have a Ubuntu server hosting a website on my internal LAN. If i try to connect from outside my LAN, eg. my phone, I have no issues. But if ...
1
vote
0answers
21 views

Monitor CPU utilization for each user

Is there any way to monitor the CPU utilization for each user at regular intervals Currently using the sar command I am able to get the following output: 12:00:01 AM CPU %user %nice ...
3
votes
6answers
290 views

When is it time to add more cores to your virtual server? [on hold]

I have a Linux (RHEL 5.8) server with Java 7 and Tomcat 7. The performance is poor, and I am pretty sure it's the DB queries that are slow. We have 2 cores right now, and load average never exceeds ...
2
votes
1answer
49 views

build user chroot on first login

I'm using ldap for remote user authentication and I basically need to either figure out how to: a. chroot a user on machine b from machine a via nfs,(which doesn't seem possible without mounting ...
-3
votes
0answers
20 views

How to select proper VPS [duplicate]

I am planing for purchase a VPS for my tomcat based java web app. I have 4 JAVA tomcat enterprise webapp whose main purpose is data management. and data representation and filtering. Database is ...
4
votes
1answer
57 views

Are ZFS pools or LVM volume groups more reliable for utilizing many partitions?

When deciding whether to use LVM volume groups or ZFS pools in configuring new file servers, what needs to be considered? Is there a "better" choice in the realm of multi-purpose file servers? Unlike ...
0
votes
0answers
19 views

Why are my multicast packet discarded?

I have two boxes and I have some issues when tcpreplaying a pcap full of multicast from one machine to the other. I see the packet incoming on the destination machine thanks to a tcpdump instance. ...
0
votes
1answer
18 views

Where is the icons folder on CentOS 5.10, and how do I disable it? [on hold]

I'm running into a PCI compliance issue (repeatedly) where the Parallels panel allows the icons/ folder and the icons/small folders to be browsed via the Parallels panel port (e.g. https:// ...
9
votes
2answers
134 views
+50

Common wisdom about Active Directory authentication for RHEL/CentOS Linux Servers?

What is the common wisdom in 2014 about Active Directory authentication/integration for RHEL-like servers and modern Windows Server operating systems? Over the years since my first attempts with ...
0
votes
0answers
7 views

Ping (DUP) with Linux bridges and tap devices

http://imgur.com/qPoy2QJ I have two Linux (Ubuntu 12.04) VM (running on KVM) that networked together using two Linux bridges as shown above. The network interfaces are Linux TAP devices. The problem ...
-1
votes
1answer
37 views

Two NIC (eth0,eth1), two global IP on same subnet. Became unreachable to IP on eth1 after reboot

I configured a CentOS 6.5 virtual server and deployed it to a remote VMware vSphere environment. We needed two IP address, so I added a virtual NIC and assigned a second IP on eth1. I didn't ...
5
votes
2answers
185 views

Windows workstations in a Windows domain with a Linux domain controller [on hold]

There's a Windows network of about 60 workstations I am going to be responsible for. The network is in a terrible mess, so I decided to rebuild it from the ground up. Currently, there are some Windows ...
0
votes
0answers
28 views

linux iptables walled garden [on hold]

Can I create a walled garden using IPTABLES (and without using proxy like squid) on debian/raspbian system which would control access to certain pages ( allow facebook,gmail and my local httpserver, ...
0
votes
1answer
21 views

Traffic on IP which is not being used?

My server (Debian 7.4, x86_64, Proxmox) has 4 IPs. One for the VM Host (call it A), and three that I use for virtual machines (say B, C and D). Currently, only B and C are used, the D address is not ...
1
vote
0answers
15 views

What does “connections reset due to unexpected data” in netstat -s mean

I'm running a memcached server under heavy load from multiple web servers. While investigating some odd app level behaviour, we spotted that netstat -s on the memcached box was showing a lot of ...
0
votes
1answer
21 views

Changing the default gateway, multiple NICs

I have Ubuntu 13.10 (kernel 3.11.0-19-generic). On startup, the network configurations are as follows: dor@ubuntu:~$ sudo ifconfig -a em1 Link encap:Ethernet HWaddr 44:37:e6:4c:ca:0a ...
-2
votes
2answers
28 views

Virtual machine access [on hold]

My host OS is Windows 7 and guest - Oracle Linux. I've got an appliaction which is running using JBoss and ngnix on guest. How can I connect to this app throgh host OS?
2
votes
1answer
26 views

How to add partition table to existing EXT4 filesystem

I have software RAID6 on 8x3TB disks (18TB), there is filesystem od device /dev/md1, but EXT4 can`t be bigger than 16TB so there is 2TB of free space. I would like to use this space. My first idea was ...
0
votes
1answer
52 views

OpenSSH and heartbleed? [duplicate]

I just updated a Debian Wheezy server for the first time today, after the heartbleed bug. OpenSSL is not installed on this server, so I thought the server was not affected, and therefore it was put on ...
0
votes
1answer
25 views

Force all traffic from servers on the same bridge to pass through router interface

I have a bridge with all hosts from the 192.168.5.0/24 network connected to it.They all connect to this bridge via a secondary interface eth1. I have a router which connects this bridge to others on ...
1
vote
1answer
24 views

Virtual Host Web Files Not Being Served

I am attempting to serve web files via virtual host, but Apache keep blocking the directory's files. All that will show is the default Apache Welcome page. index.html gets a permissions error, and ...
1
vote
2answers
46 views

High throughput meshed VPN to connect datacenter hosts

We're renting a number of hosts in a public datacenter. The datacenter does not offer private VLANs; all hosts receive one (or more) public IPv4/IPv6 addresses. The hosts come with very modern CPUs ...
0
votes
0answers
13 views

Ubuntu 12.04 crash analysis - strange binary data on all open files at the moment of crash

A couple of hours ago we got a system crash on Ubuntu 12.04. We checked all the log files and there is nothing suspicious to blame to. Last stuff that was logged was some dovecot activity. There are ...
0
votes
0answers
21 views

Multiple gateways with linux on same subnet using single NIC

I have the following configuration; Firewall 1 (site 1); x.x.x.x/26 subnet on external 10.0.0.0/8 on internal (internal IP 10.0.0.10) Firewall 2 (site 2); x.x.x.y/26 subnet on external 10.0.0.0/8 ...