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

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456 views

How to install a program remotely using Zentyal server and Windows7 clients

I'm using Zentyal in order to use it as Domain Controller. All the clients are Windows7. I, as domain admin, need to install, in several computers, one application that requires admin privileges. ...
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180 views

Can't connect Tomcat via JMX

I couldn't connect to one Tomcat server via JMX in a Linux virtual machine. There was no firewall running. All seemed ok. By searching on the web I found out that I have to use the ...
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787 views

How to measure dcachesize usage (and reduce it)

I have a VPS running CentOS 5.7 (Final), 32-bit. Right after boot, when I run # cat /proc/user_beancounters I see that my dcachesize usage is at about 4100000, while my VPS is set up with a limit of ...
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504 views

Getting ipsec-tools to work between Ubuntu Lucid hosts

I have two hosts, one is Charity with IP 67.207.128.184, the other is Hope with IP 67.207.130.204. I've installed the ipsec-tools package on each host. I have not installed racoon on either host. ...
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284 views

Postgres shell logout weirdness on debian

So, strangest thing happening on Debian PostgreSQL user: lab3:~# su - postgres postgres@lab3:~$ plogout lab3:~# And: lab3:~# su postgres postgres@lab3:/root$ pexit lab3:~# What is happening ...
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291 views

Why do I have to remount an smb share if I want to recreate a directory?

Suppose I have an SMB share mounted somewhere in a Linux filesystem. If I do this (from within the mounted share): rm -rf some-directory mkdir some-directory ls -a some-directory some-directory is ...
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24 views

How to limit connections when redirecting ports using iptables

I am trying to accept incoming connections through port 80 and reject those from 8888, redirect from 80 to 8888, validate if in the last 30 seconds has connected less than 20 times and then accept. ...
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18 views

What's causing high CPU load by kjournald process?

I'm running CentOS 5.4 (Final) server as my PDC and Windows file server. Until earlier today, the server has been running non-stop for over 6-months (since the last reboot). The problem now is that ...
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21 views

command line alias inside php exec

Is there any possibility to define shell alias for commands executed via php system, exec etc functions? I'm running multiple versions of PHP using fastcgi and I need to run the right version of PHP ...
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13 views

Turn on/off proxy pass in nginx if a particular header is set

For testing purposes (in particular I'm developing a performance analyzer for a website that currently runs in production) I need to have some endpoints (es: /performance) that should be processed by ...
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0answers
18 views

runnning systemd without PrivateTmp, PrivateNetwork and PrivateDevices (in docker - unprivileged mode)

I am happily running systemd inside a docker container, however, it requires CAP_SYS_ADMIN in order to dynamically create private tmp mounts. I have attempted to disable the PrivateTmp, ...
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33 views

Iptables multiport and source ip

I have a rule which does not seem to allow traffic as expected -A INPUT -p tcp -m state --state NEW -m multiport -s x.x.x.x -d y.y.y.y --dports 38000:38100 -j ACCEPT If I remove the -s argument ...
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168 views

Issue with RHEL7 and disabling NetworkManager

Okay community, let's see if we can figure this one out, cause I'm out of answers. Where I work I am setting up a bunch of RedHat Enterprise Linux servers. There is a collection of RHEL6 and RHEL7 ...
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0answers
20 views

php5-fpm doesn't create sockets for pools

I'm going off of section 3.1 of http://www.howtoforge.com/php-fpm-nginx-security-in-shared-hosting-environments-debian-ubuntu . I have created a directory in /var/run which www-data:www-data has ...
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17 views

Multipath tcp application level performance measurement

I am working on a project related to Multipath tcp and I want to measure the goodput and the RTT at the application level. I don't want to use a traditional tool(netperf, iperf, ...) and I want to ...
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0answers
13 views

How to test if packet has been tagged with classid

I'm trying to troubleshoot an issue I'm having related to IFB Mirroring which I'm attempting to deploy based on this question: Tc: ingress policing and ifb mirroring My theory is that since the ...
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19 views

Two port PCI serial card. One port can only set baud rate once

I have a new PCI serial card, being used on a Ubuntu 14.04 box. It's serial ports show up as /dev/ttyS4 and /dev/ttyS5. $ dmesg | grep ttyS [ 0.732690] 00:03: ttyS0 at I/O 0x3f8 (irq = 4, ...
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42 views

Ping not working from tap interface attached to bridge interface with ip on same subnet as that of bridge to outside

My requirement is to create a multiple tap interfaces, each with ip address on same subnet. I tried this by creating a bridge br0 (192.168.1.199) ...
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16 views

Qdisc pfifo_fast in linux and IP Precedence

Im using a embedded Linux distribution for a router system. My goal is to prioritize some traffic with minimum delay. I have a WAN interface with a default pfifo_fast qdisc attached to it. I have read ...
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17 views

Receive-side NIC teaming using LACP for use with NFS

I have a server with a 10G connection to a central switch. One NFS client has (2) gigabit NICS connected to the same switch. I'd like the NFS client to receive bandwidth of 2Gbps from the 10G server ...
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14 views

Subversion svn+ssh speedup needed - can we reduce per-connection read timeout?

I have a series of scripts that are doing many svn operations and taking too long and we're not sure why. For example svn switch svn+ssh://srv/repo/... ... This consistently takes about 1.1 ...
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37 views

Nginx proxy pass not working sometimes

I have a proxy server (ubuntu) that can accessible via my global IP (not have domain). For Example 85.45.0.12:6021 and this reverse to local server. Local server (10.0.0.25) installed tomcat and ...
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39 views

How to view network resources used by a thread in Linux

I am trying to check the network resources used by a thread but unable to figure out how. lsof only allows us to give the pid. I checked under /proc/pid/task/thread/ but could not find anything ...
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37 views

Unusually high nfs_inode_cache

My server is experiencing a high usage of nfs_inode_cache = 11G , im trying to figure out what's consuming all this , i know already that directories with large numbers of entries and deep directory ...
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30 views

Debian WPA2-Enterprise (Network-manager) 802.1X no prompt for certificat?

I set up an access point (AP) with PEAP (Freeradius) 802.1X authentication and trying to connect the following: IOS: Automatically provides the certificate to the onscreen user. WINDOWS: ...
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37 views

/proc/slabinfo: Input/output error

I am using Ubuntu 12.04 and XFS (kernel 3.2.0-38-generic). Because XFS inode cache use too much memory, I want to limit the number of objects used to cache XFS inode. According to the manual, I can ...
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48 views

BIND/Linux limiting concurrent UDP connections

I'm seeing an issue where the number of concurrent UDP connections to BIND appears to be getting limited. I've previously increased recursive-clients in named.conf and I've increased the socket limit ...
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0answers
26 views

How to monitor ospf session using check_ospf plugin in icinga2

I have tried to use check_ospf plugin downloaded from nagios to help me in monitoring the ospf sessions between two host running quagga. I have tested the check_snmp plugin on the hosts, and they are ...
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29 views

Group traffic shaping with traffic control?

I'm trying to limit the output bandwidth generated by an application with linux tc. This application sends me the source port of the request that I use has a filter to limit each user at a given ...
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45 views

All nework interfaces hang for seconds while one interface goes up/down

I am building a client/server application that uses several network interfaces in parallel for redundancy, and I have noticed that while one network interface goes down or goes up, the communication ...
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21 views

Losing connection to server from several computers

I have a PostgreSQL server running Oracle Linux. In my network I have several workstations each running different OS (Fedora, Ubuntu, Windows). Every once in a while I lose connection from the several ...
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79 views

arp problems with transparent bridge on linux

I've been trying to secure my virtual machines on my esx server by putting them behind a transparent bridge with 2 interfaces, one in front, one at the back. My intention is to put all the firewall ...
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0answers
51 views

How Do I Configure Nginx To Communicate with SMTP Server?

I'm an application developer and have little knowledge on sysadmin / server configuration tasks. I have an nginx server communicating to a Flask web application through uWSGI on a VPS. I'm trying to ...
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0answers
23 views

Kernel Compiling from Vanilla to several machines

When compiling kernels for machines is there a safe or correct way to create a template for say servers? I work with a lot of RHEL servers and want to compile them with GRSEC. However, I do not wish ...
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68 views

PhpMyAdmin Hangs On MySQL Error

I'm currently running PhpMyAdmin 4.0.10 (the latest version supporting PHP 4.2.X) on my Amazon EC2 connecting to a MySQL database on RDS. Everything works perfectly fine except actions that return a ...
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28 views

XenServer pool, unable to access certain networks from 2 servers in pool

I have Xenserver pool of of 3 xenservers, at version 6.1. After we got a serious DDOS attack on our network, all servers got rebooted (whole pool of 3 servers got restart and entered into maintenance ...
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0answers
99 views

ClearOS Proxy - Block all traffic but two sites and 3 DMZ ips

I've been trying to two days now to get ClearOS to do a proxy setup for my network. This is what I need to do: I need to block all outgoing traffic no matter what it is, all ports and HTTPS as well ...
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0answers
28 views

why my ftp log is showing such error of anonymous logging with my server ip as client

I have my ftp in my organisation . access by various branches on remote. why i'm getting such log in my ftp server (vsftpd) . as anonymous logging is not enable .and also getting the ip of my ftp ...
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39 views

heartbeat doesn't work on virtual interface

I try to use vertual interface as broadcast for heartbeat(bcast in ha.cf). When I try it I see this message in syslog: May 23 12:17:26 Ubuntu2 heartbeat: [1107]: ERROR: glib: Error setting socket ...
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0answers
18 views

PHP APC cannot increase cache above 32m

apc.shm_size I set it to 128M I have also try 128 (without M) But It always 32M :( /proc/sys/kernal/shmmax is set to 134217728
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24 views

RabbitMQ server randomly, mysteriously stopping

I installed RabbitMQ on my EC2 box following the RPM install instructions from their website. My OS is CentOS. Every now and then, the rabbitMQ server just stops running, nothing shows up in the ...
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0answers
43 views

Upgrade Raid 1 to Raid 0+1 and bootloader issue

I am trying to convert my current RAID 1 to RAID0+1 and facing issue in installing bootloader - please have a look what i am doing. My current configuration is RAID1(2*10GB): [root@localhost ~]# ...
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22 views

LVM physical volume priority

Linux LVM can combine several physical volumes in one group and when spread space of this group among logical volumes. If some slow devices will be added to group it may slow down all logical ...
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0answers
79 views

Squid in reverse proxy mode: need to rewrite host headers

I am trying to deploy squid on a server to which I can point a number of domain names and have it load content from my main domain www.example.com, which is on my private network. Basically I need a ...
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0answers
72 views

How do I get the size of a btrfs subvolume (compressed vs. uncompressed)

Is there a command to get the on-disk size of a btrfs subvolume? The file system was mounted with -o compressed and the subvolume contains a lot of files that should compress rather well. I could use ...
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42 views

How can I run a CentOS (Red Hat) cluster in degraded mode?

I've installed Red Hat's cluster software on an install of CentOS 6.5, and use it to provide redundant routing from one network to another. This works fine, and I have a pair of boxes providing the ...
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0answers
12 views

How to safely upgrade the version of libxml2 on our server

We currently libxml2 2.7.7 installed on our servers. This is a dependency of lxml which we use on two difference clusters of Zope instances runing our 2 Plone CMS applications. We'd like to upgrade ...
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38 views

Single process blocks NFS mount on entire node

We have an NFS mount and a PBS cluster in which all nodes mount that NFS mountpoint. We are experiencing that a single process on one of the PBS cluster nodes can completely saturate and bog down the ...
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80 views

VPNC cisco + quick mode response rejected error

I installed a vpnc on my Linux red-hat machine version 6.3 Most of the cases vpnc work well ( connecting to gateway customers by vpnc ) But against some particular customers ( Cisco gateways ) , ...
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45 views

MySQL SSL Problems

I need to configure SSL for a MySQL server. I've read all of the directions for doing self-signed certs but it's preferred that I sign and use the certs from a different CA running AD Certificate ...