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

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NFS lock not working properly

I'm getting the following error on an oracle database. ORA-27086: unable to lock file - already in use It tries to lock a file that resides in an NFS mount. The NFS is on a loopback setup (long ...
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11 views

Implement HTTPS in with pfSense, Varnish and Tomcat

Situation I have an ESXi Server hosting multiple VMs, including one for each pfSense, Varnish and Tomcat. They are configured like the following: pfSenseVM (Firewall, IP=10.0.0.1) NAT Rules from ...
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0answers
9 views

linux receive phone call and execute skript

I'm planning to have a server, which is connected via a modem to the phone line (no VoIP). So it should be possible to call this Server and type in an code. If this code is correct, a shell-script ...
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1answer
21 views

Command to list all usernames on a Linux server

What is the command that allows one to generate a list of all the usernames of authorised users on a Linux server? I have tried getent passwd | cut -d : -f 1 | xargs groups and less ...
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2answers
27 views

Cannot install mysql-devel on centos

Everytime I try to run sudo yum install mysql-devel I am met with the following error: Setting up Install Process Resolving Dependencies --> Running transaction check ---> Package ...
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0answers
15 views

Eventual network freeze on linux systems

I am chasing the problem for about a a year now. I have 10 playstations running on custom made kernels and one host running on knoppix(remaster) but with original knoppix kernel with firebird server. ...
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2answers
18 views

SSH Passphrase for ppk file

I'm trying to connect to EC2 server, using .ppk file ssh -i key.ppk -l root@dns-name The issue is that, the shell asks for passphrase ? i don't know what is it! Am able to use this key using ...
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3 views

When I ncpmount a Novell server under Linux (Ubuntu 14.04), I do not see filenames with accented characters

I use Linux on my computer at work and the server uses Novell. I am friendly with the IT staff in a "don't bother us, and we won't bother you" kind of way, and I can usually fix my problems myself ...
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0answers
17 views

apache2 server time out on public IP

I set my server to a public IP. When I attempt to connect to it or load a webpage I will occasionally get timed out. I was told to look into the worker threads and script execution location. ...
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0answers
195 views

I've uninstalled/deleted bash and it's killed the server

I changed the default shell to zsh. And then proceeded to uninstall bash (this was via yast on SLES). To my horror I start to see everything deleted/uninstalled, apache, mysql . I can't putty into ...
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1answer
23 views

Suggestions about a firewall operating system on a i386 machine [on hold]

I want to know if it is advisable to have a firewall linux o.s. (for example pfsense) in a standard i386 computer instead of a dedicated hardware. Moreover I want to know what do you think about a ...
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6 views

ffmpeg mp4 and webm files save to standard folder but only webm to mounted folder

So i am running an ffmpeg command on my linux server using the php exec command : exec("(nohup nice -n 19 " . $ffmpegPath . " -y -i " . $srcFile . " -f mp4 -pass 1 -passlogfile " . $video_pass_log . ...
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0answers
6 views

Avira Webgate Troubleshooting: High CPU load

we are using Avira Webgate as Virusscanner for squid. We have two Servers running the Avira Webgate and see in both servers the same behaviour: The CPU is nearly always at 100% CPU whicht is fine on ...
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0answers
16 views

Linux TACACS+ authorization

I'd like to know to to authorize (only allow a set of commands) users on Linux console (bash). I'm so far able to authenticate ssh users over TACACS+ but authorization is not working. This is my ...
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0answers
20 views

Isit possible to share a linux machines hard drive across a vrack with a Windows server?

So the title says it all can i setup a linux server to share the hard drives across a vrack with Windows server 2008 / 2012 ? I have shared windows server hard drives with other windows machines but ...
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0answers
4 views

Samba server increasing the memory requeriments

I have a Samba server exporting a entire filesystem (fhgfs/beegfs filesystem), total amount of 550 TB. The specifications are the following: Scientific Linux 6.5 (2.6.32), 2xIntel Xeon X5570 8 (2.93 ...
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0answers
56 views

How to disable AAAA lookups?

... to compensate for broken DNS servers that are outside our control. Our problem: We deploy embedded devices that collect sensor data at various, mostly IPv4-only sites. Some sites have poorly ...
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0answers
27 views

RAID0 : best chunk size for fileserver with average 650KB files

I found out that my server(linux Ubuntu Server 14.04) has probably a to high chunk size for the RAID0, or atleast I think this is an performance issue... The current chunk size is 512K with 4 disk of ...
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1answer
15 views

Spacewalk/Satellite Errata - what is it?

I'm running spacewalk server to get used to it before using Red Hat Satellite on production. There is Errata concept I do not understand and can't find answers anywhere. Have found something similar ...
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1answer
19 views

starting linux services delayed issue

I have an issue where the bind9 service aka named in my ubuntu system is starting up before my openvpn service. When this happens, the network interface that openvpn creates (tun0) is not found by ...
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0answers
17 views

should a virtual interface clash with keepalived?

I was working on a server today, debian squeeze. After testing this on two staging servers, I added a virtual network interface to /etc/network/interfaces like this: # The primary network interface ...
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28 views

linux capability - iptables as child process

I have a process that fork-execlp "iptables-restore file.rules". It looks like it doesnt have the permission since i dont see some of the rules not listed like INPUT DROP after the process executes . ...
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1answer
19 views

How do I disable globally directory listing in Apache?

I have alias for app.example.com/Upload and virtual host app.example.com and main web site x.x.x.x and subdomain23.example.com and someotherhost.com etc etc... I want to disable directory ...
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22 views

check maximum number of virtual mailboxes on mail server [on hold]

what's the maximum number of virtual mailboxes i can create in Linux mailserver ( Postfix/Dovecot ) ? is there a configuration parameter for this ?
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20 views

Why is Linux load average reported as the exponential moving average? [migrated]

Why is the Linux load average over the past 1, 5 and 15 minutes reported as the exponential moving average, instead of just simple (unweighted mean) moving average? It seems to me that the simple ...
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3answers
65 views

How to make a grep which excludes a bunch of pipes?

I want to make a diff of hostnames using grep. I have 2 files. One yaml and one .pp. In the yaml I have domain names with ips and in the .pp file I have fqdn and ip in hash style. Like this: In the ...
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0answers
27 views

Why can't a GPT partitioned disk on SATA be read on USB?

If I GPT partition a 4TB disk when it is connected to SATA, then it works fine. If I take the disk and put in the an USB3 enclosure, then I get [root@localhost liveuser]# sfdisk /dev/sdb sfdisk: ...
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2answers
39 views

cent os fail to install mysql-devel

I want to install python-mysqldb. But it tells me that I must install mysql-devel first, and then I have this problem: [root@iamca yum.repos.d]# yum install mysql-devel Loaded plugins: fastestmirror, ...
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1answer
47 views

Unix backup solution with version control [on hold]

Currently I have a Windows machine with Second Copy backup software running in between my file server and backup server, both of which are running Linux. I know backup scripts can be created using ...
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2answers
26 views

Traffic redirecting with linux? (Man in the middle)

I have got the following scenario: I have a Linux box with two NICs and all network traffic comes in trough one NIC and goes out to the other one. So basically I'm already the man in the middle. But ...
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1answer
18 views

adding RHEL to existent Windows installation [on hold]

I'm using HP DL360p Gen8 There are 3 drives installed - 2 are in mirror-raid, and third is spare. Windows OS is installed. Now I want to add RHEL, I want to keep Windows too. What would be the right ...
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correct way to buy RHEL for HP DL360p Gen8? [duplicate]

I'm sorry for another too novice question, just never met these things before ) I would like to buy RHEL for my HP DL360p Gen8 server. I'm using it for trading, I have 2 processors. I want it to be ...
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1answer
29 views

iptables - ignoring -i

In my iptables rules, I want to accept only lo but drop every other interface. but when I execute this command : -A INPUT -i lo -j ACCEPT it is not specifying interface lo but it is accepting all ...
2
votes
1answer
25 views

Puppet's issue: Configure WAN interface, reload network in the process result in broken agent's run

A little background: I want to use puppet to fully configure RHEL6 servers freshly after they have been installed with kickstart, the kickstart itself is fully automatic and provide dhcp-enabled ...
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0answers
35 views

Becoming a sysadmin, advice please [on hold]

Okay so one day I wish to be a sysadmin with Linux, I would do it with MS, but I hate Windows, I constantly get frustrated when I have to use it, even though I have used it for years. Anyways I wish ...
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1answer
21 views

SSH and HTTP connections refused from ec2 instance, but the instance is in running state

My ec2 instance (CentOS 6.3) has been in running state all time but I was unable to make SSH and HTTP request to the instance until making AMI from the instance and launching new instance. Another ...
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0answers
34 views

“Network is unreachable” while defining specific route

Tun1 is my VPN tunnel. I don't understand why I get "unreachable" here: # ip route default via 192.168.1.1 dev wlan1 proto static 10.1.0.0/16 via 10.9.0.5 dev tun1 10.9.0.1 via 10.9.0.5 dev tun1 ...
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1answer
7 views

Setting up Jetty SessionHandler

I am trying to set up persistent sessions on Jetty 9.2.3 on a linux machine running Java8. I have added jetty-web.xml file to my app under ${jetty.home}/webapps/app/WEB-INF/ with the following ...
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votes
1answer
24 views

How to find old email accounts in imap? [on hold]

I have a webmail with 90.000 imap accounts I'm trying to delete old email accounts (for example : accounts that has not been used for 1 year) this link may help to best answer: ...
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2answers
35 views

Linux -Can I rsync to dropbox or another free cloud storage service? [duplicate]

We host a small community, not for profit site and mailing list, is it possible to rsync to dropbox or a similar (free) service to maintain backup? Edit: For context, we host on a shared VM and don't ...
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0answers
18 views

How to bring rhel7 errata into spacewalk 2.2?

Is anyone using spacewalk for rhel 7? How are you downloading patches now that mrepo does not work with subscription-manager? How are you importing errata for rhel7 into spacewalk 2.2?
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1answer
43 views

Understanding du -sh command output

I have 1 TB of space. I am trying to find disk usage of a folder. du -sh command output 354M Arts 2.6M Digicams 308M Internet 391M Location 2.2G Media 110M Religion 4.8T Sports ...
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0answers
72 views

How to fix Shellshock vulnerability on Debian Squeeze? [duplicate]

How do you fix the shellshock bash vulnerability on Debian Squeeze? (I originally posted just the answer but that got modded, go figure), so now I'll post the answer below...
3
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1answer
96 views

Ping fails with the record route option

I'm having trouble with the record route (-R) option of the ping command in Linux. It appears that when I run the command without this option, I am able to receive a response from a range of servers ...
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0answers
73 views

Server RAID0: one hdd is more %busy then the others?

I'm testing 3 servers with RAID0 with 4 disks. During my test I noticed on all 3 servers that one of the hdd's is more %busy and has much higher averige IO wait (almost 4x higher then the other ...
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1answer
65 views

CentOS 7: Getting interface IP numbers

I am trying to autopopulate the /etc/issue in a CentOS 7 image (this will be a template, and it needs to be easy to identify the resultant VMs at a glance). I have the following in my ...
0
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1answer
37 views

Only allow a connection from specific domains

I bought a small VPS system earlier today to handle my website database, and went away for a couple of hours, but when I came back and logged in again, I found that an IP address in China had been ...
0
votes
1answer
22 views

How to find the cause of random network timetous

I have Centos 6.5 server that is having some issues with random network timeouts. It happens 3 o 4 times per day ( I couldn't identify a specific minute or hour ). When it happens, it affects almost ...
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1answer
25 views

Virtualized Linux firewall as router on the stick for cisco switch

I have got: Linux(virtual maschine on esxi) <---trunk---> cisco Switch. On virtual maschine vSwitch setup: VLAN ID 4095 Enables trunking on port group (VGT Mode) LINUX interfaces file: ...
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0answers
27 views

Cron bash script skips second do/done set

I have a script that checks IPs for ping reply then tries to run an snmpwalk on them. I am trying to schedule the script to run weekly in cron. When I run the script in the shell, it runs perfectly. ...