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

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why is my server fork rate increased?

I see my server fork rate increased almost from 800 forks/min to 2500 forks/min in munin graph. My server is running VPN service which is serving 250 clients maximum. Other than this service there is ...
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7 views

how to setup smtp server in Intranet sub-domain using linux?

I would like to setup an SMTP server in a Linux system to be used by an application to send emails to users and process their replies. Our organisation uses MS Exchange and they don't want to setup ...
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0answers
7 views

How can I generate two Grub2 entries for each kernel? [migrated]

Due to bugs in my laptop's BIOS (or some such thing), I use the boot flag nox2apic when I know I need to attach an external monitor. However, when this flag is enabled, pressing some multimedia ...
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1answer
16 views

Error Log levels Apache 2.4

Is there any way to temporally get more detailed log errors in Apache 2.4.6 on Centos 7 ,if so , what would it be the way to look into the actual level of logging and which one would it be the way to ...
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1answer
28 views

linux pseudo files for rotating streams

i've got some problem with rotating files. Situation is next: one program like wireshark or vlc dumps all to one file, say netstream.bin If i mv netstream.bin to netstream.bin.rotate program will ...
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1answer
23 views

How to deploy an application composed of Docker containers into the AWS cloud?

What are the best practices for deploying Docker containers in production on Amazon Web Services cloud? What production-ready non-AWS specific orchestration tools would you use for continuous ...
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1answer
124 views

Cannot ping to localhost into CentOS

I'm connecting to my server (Centos 7) with ssh and I try to ping to localhost: ping 127.0.0.1 but doesn't work: ping 127.0.0.1 PING 127.0.0.1 (127.0.0.1) 56(84) bytes of data. ^C --- 127.0.0.1 ping ...
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0answers
3 views

Debian Network-manager, how is the steps of connections to a captive portal [migrated]

now a few days ago I'm looking how the network-manager works to automatically open to the browser when connected to a captive portal. I know Windows and Apple need to have their own domain hosted ...
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1answer
17 views

how increase classes in HTB

i'm trying to setup a traffic shaping by HTB and tc. i have 70,000 users and i want to control the bandwidth of each user , so i create 70000 classes and assign each ip address to a class by ip table. ...
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0answers
20 views

why cisco VPNC work on the second time each time and not on the first time

I use the vpnc ( cisco VPN that installed on linux red-hat 6.X ) and the vpnc.conf file look like this more /etc/vpnc.conf ## generated by pcf2vpnc IPSec ID Comvwde IPSec gateway 217.118.6.7 ...
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1answer
26 views

ldapsearch result: Can't contact LDAP server (-1)

Anyone knows which the problem? I installed LDAP: yum -y install openldap-servers and then checked is the installation work well starting slapd service and doing ldapsearch like this: ldapsearch ...
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0answers
11 views

How to test the performance of Hadoop Cluster?

I have already set up a Hadoop cluster, the version is 2.6.0. But I don't know how to test the speed or other performance relate to the cluster. Can anyone tell me how to test Hadoop cluster? Is there ...
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0answers
15 views

“Packet Dropped” in OpenVPN on Ubuntu Server

I configured OpenVPN Server in Ubuntu 14.04 Server. It's okay but in /var/log/syslog I got the error. Mon Jan 26 02:46:02 2015 us=389908 user/20.10.10.1:57237 MULTI: bad source address from client ...
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0answers
14 views

POST from Apache to IIS doesn't close connection if using SSL

We have built a simple API using ASP.NET MVC (C#) running on IIS 7.5. The API accepts POSTed values and then returns an XML response. We have one client (using Apache on Linux) that is successfully ...
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1answer
13 views

IPSEC stack low speed

I am working on Openswan IPSEC Implementation for Linux-kernel 2.6.35.9 My concern is when i do speed test using IPSEC kernel Images and without running IPSEC service i get speed of 40Mbps and ...
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1answer
29 views

Linux soft RAID6 how to identify last failing drive

I have a RAID6 array that had been neglected, and just had the third drive fail. I want to do a ddrescue of the last drive to fail to try to recover the RAID, however I don't know how to identify ...
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1answer
38 views

Port scanning from VM users

After receiving an Abuse Notice from my server provider, i was wondering how they make to check up all my traffic and send me these abuses. I would possible like to know if there is some kind of ...
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1answer
51 views

124 emails sent at once while one should be sent every five minutes by cron if a certain web service stops running

So I set up a simple script to send an email alert when a certain web service stops running. It has a simple flow of: test = $( curl [address] | grep [a certain string in response] | wc -l ) if [ ...
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0answers
21 views

What you want to see in daily linux server monitoring mail? [on hold]

I write bash script, which collect information from ubuntu server and send it by mail. With this script you can see: Your clamav antivirus information Which ports are open How many users in your ...
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0answers
23 views

Recover rm'd files from last day? [on hold]

TL;DR: Can you recover only the files that were deleted today? I'm in the process of testing different linux distros as I haven't found the right one yet. Part of this testing involves mounting a ...
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0answers
44 views

Debian DNS servfail

I have serious problems, and been struggling for days with this...Please help me what's the problem? :( i get servfail error everytime i do nslookup, and i tried everything... Please save me! very ...
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0answers
19 views

User permissions/feature limitations of the native zfs smbshare service on linux

I'm using zfs on linux, using the sharesmb=on option to try out the native smb share feature instead of adding the zfs tank path to my smb.conf file. The share has shown up on my windows machines, ...
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0answers
14 views

looking for - dedicated server with high connection per second limit (or without one) [on hold]

We are looking for a provider that offers servers located in the US/CA, with (guaranteed) high limit of connections per second, or without any limitations Currently, we have a server at OVH but their ...
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1answer
27 views

No space to snapshot on xenserver - Catch 22 to move the VMs

I am trying to move some VMs from one Xenserver onto another one but am stuck in a catch 22 situation. I have 3 VMs running on this server all on one storage repository. I don't have space to snapshot ...
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0answers
22 views

hdparm serial number is garbage

I'm trying to read the model and serial number from a drive using "hdparm -I /dev/sda" and I find on some systems (eg: VMware virtual machines) the serial number and model often return garbage (see ...
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0answers
13 views

EasyApache Error -> undefined reference to `SRP_VBASE_free'

I am trying to upgrade Apache using WHM's EasyApache script but I am getting the following strange error during the build. Can someone please guide me what this error means? ...
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0answers
42 views

Ubuntu 12.04.2 LTS Server - Randomly hangs with no logging

My server randomly hangs and becomes unresponsive without any logging (dmesg, syslog, kern.log, boot.log, and messages). I cannot predict when it is going to happen. Sometimes the server runs fine for ...
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0answers
13 views

Pam modules: some troubles understanding things [on hold]

I recently started to study PAM and for the moment I am having troubles in understanding an entry from /etc/pam.d/sshd (among others). auth required pam_unix.so ... ... ... account required ...
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0answers
23 views

How to make Supervisord read bash environment variables [on hold]

I am using Supervisord to run my java application, which requires some environment variables for configuration. I am setting the environment variables in /etc/environment export ...
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0answers
14 views

Broken Pipe error being thrown when configuring OAM 11g for simple mode

I looking for some advice/help with OAM 11g which when configured for simple mode with a 10g Seagate throws an error on the oam server of broken pipe. The set up is oam server is on a Linux 64 bit ...
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1answer
20 views

How to log server IP in exim main log

I'm sending mails using IP rotation in exim, I tried to log the server IP in exim log, using log_selector = +all in exim conf, but it's not logging the server IP in exim main log Is it possible to ...
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1answer
16 views

BackupPC schedule advanced settings

I've just installed this great tool for network backups called BackupPC but I'm having some difficulties setting the Schedule parameters as I want. As I see it, BackupPC has some basic schedule ...
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0answers
4 views

Trying to run Konsole from XMing (Windows) fails [migrated]

Connecting from XMing latest running on a Windows 7 laptop to an Ubuntu 14.04 server running KDE. I get the following error: cpatti@hab: ~ $ konsole ...
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2answers
48 views

Gateway can be pinged, but fail to add route with it

I want to use 10.1.16.189 as gateway to access 9.36.204.4 both on redhat 6.4. here is the network configuration of my machine: eth0 Link encap:Ethernet HWaddr 06:FB:C1:7B:19:FD ...
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1answer
36 views

EXT4 Single Larger Volume or Many Smaller Volumes

My question is regarding the file system performance of EXT4 volumes relative to size. We have a NAS running any arbitrary Linux platform. The NAS has (12) 4TB disks in a hardware RAID 6 with LVM ...
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0answers
28 views

Debian server hacked - root login on /dev/tty1 - therebel exploit [duplicate]

I have a test server running Debian Wheezy (Kernel 3.2.0-4-amd64) and OwnCloud 7. It is a virtual machine hosted on a Debian Wheezy kvm Server. It uses an own IP address configured via br0. I made ...
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0answers
27 views

Find out what processes are forking

My server seems to be a bit slow, so I decided to install munin to see what is happening. One statistic that stands out is that the server is forking 50 times a second, which seems a little excessive ...
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0answers
19 views

Fix program freeze with ram

I'm using program with small bug. It's closed - source, so i cant change it code. It's very good for what its doing, and there is no apps like that one. So i can't use other programs. But that ...
2
votes
1answer
26 views

How do I monitor file modifications of a Linux user from the user process instead of the file-system itself? [on hold]

We have a requirement to fill that will give us a daily report on all the changes that were made (and who made them) through the SSH protocol; whether it be files or database resources. Monitoring ...
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0answers
5 views

m_split reverse operation for mbufs [on hold]

I need to perform an operation to combine two mbufs as a single mbuf pointing the complete data by both the single mbufs. For instance, if mbufA --> 0xA0 to 0xB0, and mbufB --> 0xB0 to 0xC0 and these ...
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0answers
20 views

RHEL6.4 server did not send a SYN/ACK packet in response to a SYN packet from AppDirector intermittent

In my case, client access this RHEL6.4 server thought AppDirector, so the TCP connection is from AppDirector to the server. According to wireshark, sometimes, RHEL server didn't respond for the first ...
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0answers
10 views

Is it possible to add support for additional OIDs in SNMPD (RHEL)

I am trying to have my monitor poll the number of ESTABLISHED TCP sessions on a Linux server that is running snmpd. The OID information I am trying to poll can be found Here . The OID is ...
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0answers
8 views

MAC to MAC MII interface not working

I have a MAC to MAC MII interface, whose schematic design is followed from here. I want to ping one device from another. I have worked with MAC to PHY MII interface and get it working. On ...
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3answers
48 views

Linux network interfaces take so long to come up

When any of the network interfaces on my x86 server comes up (1GbE port with igb driver, or 10GbE port with ixgbe driver), whether it's been done using ifup or by enabling the switch ports it's ...
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0answers
9 views

Exim4 panicking, missing /etc/vmail/<domain>/passwd file

I keep getting this error. /var/log/mail.err Jan 22 05:00:03 home exim4: ALERT: exim paniclog /var/log/exim4/paniclog has non-zero size, mail system possibly broken Checking ...
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0answers
12 views

Rolling your own mongodb server with WebUI for admin? [on hold]

Recently we came to conclusion that we will need some pretty powerful mongodb machine. So i came to this very nice 320 USD/month Digital Ocean machine ( 12 CPU / 32 GB RAM ), but i have no previous ...
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0answers
18 views

Hadoop HA connection issue

I am using the Azure VM to build a Hadoop HA cluster, I'm trying to set up an Active namenode and a Standby namenode. But when I finished my configurations, I found I can only access one namenode via ...
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1answer
27 views

Is my default File System ext4

By running df -hT that shows mounted file systems, how can I know if my default FS is ext4? Also as mentioned by one of the MongoDB engineers in this video (@1:13) from M202: MONGODB ADVANCED ...
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1answer
24 views

Installing RHEL 5.8 on > 2TB drive

I'm trying to install RHEL 5.8 x64 on Cisco UCS C240 server with 4TB OS Drive. The drive is behind LSI MegaSAS. Before installing RHEL, I booted off from an Ububtu 14.04 Live DVD. Using gparted, ...
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1answer
16 views

Dumpcap on remote linux interface

I want to capture packets on a remote linux interface using dumpcap. I have observed that there is a command - dumpcap -i rpcap://<host>/<interface> and dumpcap -i ...