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

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78 views

Entropy Deprivation on Bind / Named Servers

I noticed that my DNS servers are having low points in the available entropy: (Note it doesn't stay that low, but within 10 minutes there are several low points (this graph shows the min of 10 min ...
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votes
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545 views

Varnish “FetchError no backend connection” error

Varnishlog: 0 CLI - Rd ping 0 CLI - Wr 200 19 PONG 1340829925 1.0 12 SessionOpen c 79.124.74.11 3063 :80 12 SessionClose c EOF 12 StatSess c 79.124.74.11 3063 ...
4
votes
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392 views

Gracefully Restarting Django Celery Instances

I'm wondering what the best way to restart Celery is without losing any tasks during the restart. I'm currently running it as a daemon using the init.d/ script provided with celery - everything is ...
3
votes
0answers
22 views

VMXNET3 nic loses the ability to update ARP table after N hours

I have a fedora 18 VM that stops updating the arp table on eth1 after running for a number of hours to days. There are other VMs on the same hypervisor that can access all of the same networks without ...
3
votes
0answers
78 views

timing issue after route add/delete (route not used)

I have an application that is running a raw IP socket, destination of this socket is governed by routes installed via the 'ip route add' command. These routes can change during the lifetime of a ...
3
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137 views

veto files on a Windows Share

On Linux you can just edit the smb.conf file and add a veto files setting to ignore and delete certain files, this came in really handy as both OS X and Windows love to create extra files. However, ...
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144 views

OpenVPN Keeps Crashing

Oct 20 21:00:44 sb1 openvpn[2082]: <MY_IP>:28523 [vpntest] Peer Connection Initiated with [AF_INET]<MY_IP>:28523 Oct 20 21:00:44 sb1 openvpn[2082]: vpntest/<MY_IP>:28523 MULTI_sva: ...
3
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219 views

linux initcwnd and initrwnd via /etc/sysctl.conf

Folks, As we know, the 3.x kernels have higher TCP default connection values, such as initcwnd and initrwnd. For 2.x friends, is there a way to set these in /etc/sysctl.conf instead of the ip route ...
3
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114 views

snmp MIB-TCP::tcp not showing any usage

I am trying to configure MRTG on all of my servers for making a network weathermap, this requires running SNMP which MRTG gets the information from. So, I installed it on two servers the exact same ...
3
votes
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56 views

reprepro use when multiple sources have the same codename

I'm investigating the use of reprepro to control what updates get propagated to our servers, and when. The idea is to vet updates by Debian and Ubuntu, and only apply the ones we choose. We want to ...
3
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257 views

Quantifying the effects of partition mis-alignment

I'm experiencing some significant performance issues on an NFS server. I've been reading up a bit on partition alignment, and I think I have my partitions mis-aligned. I can't find anything that ...
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183 views

Samba4 locked pst files

i have a samba4 server that holds my clients outlook pst files, if the outlook client or the machine crashes i must go to the server to kill the PID manually. i saw there was "reset on zero vc =yes" ...
3
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474 views

Intermittent NFS lockups on Isilon cluster

We have an Isilon cluster with 8 IQ 12000x nodes which exports storage via several NFS shares for a handful of Linux and Solaris clients. There is a Linux system that has one of these NFS filesystems ...
3
votes
0answers
660 views

How do I configure OpenSwan to allow pure IPsec (not L2TP) connections from an iPhone?

Similar to this question, I want to configure an IPsec server on Linux which will accept connections from the iPhone. However, unlike the other question, I want to be able to test with pre-shared keys ...
3
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254 views

Intermittent munin-cron error “There is nothing to do here, since there are no nodes with any plugins”

We've installed munin monitoring on one of our servers. Generally it seems to be working well but occasionally, 4 times in 2 months to be exact, munin-cron has generated the following error: ...
2
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39 views

Linux NFS - set default user for new files on nfs share

I use CentOs as nfs server nad 2 Centos machines as clients. I have some problems with permisions/ownership for new files/directories created from clients on nfs share. My exports file: ...
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24 views

How do I get the file name corresponding to an NFS file handle on Linux?

I have tcpdump output of some NFS traffic, it shows which file handles are being read or written. I'd like to know which files they correspond to. There's got to be an existing tool which will list ...
2
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87 views

squid transparent proxy https

i hope someone can help me. i have this problem: squid is running as a ssl transparent proxy, and at the moment it's receiving all the traffic with these two iptables rules: iptables -t nat -A ...
2
votes
0answers
46 views

Lots and lots of kernel log entries: iint_free: readcount: -1, iint_free: writecount: 1

I am getting tons of log entries of the form Mar 2 00:44:10 SRV123 kernel: iint_free: readcount: -1 Mar 2 00:44:10 SRV123 kernel: iint_free: writecount: 1 Mar 2 00:44:10 SRV123 kernel: iint_free: ...
2
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0answers
90 views

Adaptec pm80xx Driver Drops Drives Randomly

I'm building a ZFS NAS using an Adaptec ASA-71605H HBA on Ubuntu 12.04.4. Modern Linux kernels ship with the open-source version of the required pm80xx kernel module. Adaptec provides a driver for ...
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74 views

How to stop double-bounce FROM sender in postfix

I am getting huge amount of these in my mail log, and unable to find its originator. What could be the reason? Here is log entry: postfix/cleanup[9626]: 4413082E40: ...
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35 views

RAID1 disks “forked”, now duplicate

I have got a server hosted by OVH, which is configured to have a soft RAID1 array, /dev/md0, that holds a LVM PV. There is another /dev/md1 array, which was supposed to be the /boot, but which is ...
2
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0answers
98 views

ZFS on RedHat configuration

I have to set up a ZFS storage appliance (Oracle ZFS Storage ZS3-2) with NFSv4. The NFS is mounted on a Redhat 6.5 cluster, where the linux users are created (they don`t exist on the appliance). ...
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51 views

How to debug sluggish process performance

I have a test application which writes a string to a file 10000 times. I run this on two servers and I get totally different results. [SYSTEM 1] $ time ./test_depth real 0m0.152s user ...
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54 views

Meaning of requeues of tc command

I ran this tc bellow and it outputs requeues with high number, do you know what this requeues means? By the way, it keeps increasing over the time. I look at man tc but I couldn't find anything. $ ...
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106 views

Please help recovering lost volume group

After a reboot, the volume group on my server completely disappeared. [root@dal01 log]# vgdisplay No volume groups found [root@dal01 /]# lvdisplay No volume groups found [root@dal01 ~]# pvdisplay ...
2
votes
0answers
85 views

NFS server export list empty

After upgrading my router, I am unable to mount NFS shares from a Debian server on an OS X client. I have updated /etc/exports according to the new IP address of the client (first line previously ...
2
votes
0answers
102 views

Xen Dom0 could not find boot device (or any disk)

I have a brand new DELL server running SLES11 SP1 where I am trying to install my very first Xen Hypervisor. So I installed "Hypervisor and Tools" via YaST (excluding graphical elements), which ...
2
votes
0answers
86 views

mdadm raid10 or nfs performance issues?

I have a fresh mdadm RAID10 device which is healthy, built from 4 x 7200rpm SATA 3 drives: # cat /proc/mdstat Personalities : [raid10] [raid1] md2 : active raid10 sdc3[5] sda3[4] sdb3[1] sdd3[3] ...
2
votes
0answers
54 views

puppet node keeps adding itself to the master

Im at the start of learning puppet. So far I successfully setup my master with dashboard and a couple of agents. But on one of my testing nodes I made a mistake when adding the node. I added it twice ...
2
votes
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51 views

Syslog-ng not logging on debian

I have syslog-ng running but it does not seem to be logging to /var/log anymore. Looking at the logs it apparently used to awhile back: -rw------- 1 root root 0 Sep 8 00:55 messages ...
2
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0answers
74 views

How can I use a Linux BIND DNS server for my Active Directory forest?

I am trying to setup an Active Directory forest that uses a Linux BIND server for DNS. The goal is that the Domain Controller (DC) to be able to make entries in the /etc/bind/db.foresta.net file from ...
2
votes
0answers
68 views

Mail Service requires reboot every few days

I'm kind of new to postfix so am hoping someone can point me up the obvious here I have a Postfix working as SMTP server and everything is fine for a few days. Then without warning or apparent reason ...
2
votes
0answers
92 views

Internet Explorer SSL use causes segfault - Apache httpd SIGSEGV in apr_uri_parse

Recently I've had quite a large influx of the error below in the error_log. I've found out that it happens when someone browses my site using SSL https: and Internet Explorer, all other browsers are ...
2
votes
0answers
53 views

How to find out cgroup of a particular process?

Is there any method to get cgroup of process? The only one package that I know (cgroup-bin), just provide some manipulations with cgroups and allow to change cgroup of process/list of processes, but ...
2
votes
0answers
62 views

How do I find the path of socket?

Is there any method that can allow me to find the path of socket if the type of socket is PF_UNIX? And I have another question: let's assume that I have the following output of lsof: COMMAND PID ...
2
votes
0answers
128 views

Why can't I malloc as much memory as `free` reports as being free?

The following C program allocates slices of 10MB of memory until it is killed by the Out of Memory killer. #include <stdio.h> #include <stdlib.h> #include <string.h> #include ...
2
votes
0answers
46 views

EC2 Ubuntu SSH Stops Working

I use about 15 EC2 instances to run some services. They are hosted on EC2 and run Ubuntu. Every once in a while the SSH stops working and the "Reachability Status" in the EC2 console shows that it is ...
2
votes
0answers
37 views

Apache2 serves gibberish after 2.4 upgrade

Problem: Apache 2.4 on Ubuntu Linux 13.10 serves gibberish instead of content over https: using AuthBasic and .htpasswd-based authentication. Here's an example: ...
2
votes
0answers
67 views

MICR check printing through Linux (EBS)

We are currently working to get a new MICR check printer (Troy Micr - HP Laserjet 600 M601) printing correctly with Oracle EBS. Our EBS installation runs on Oracle Enterprise Linux (Redhat Based). The ...
2
votes
0answers
133 views

Configure SSH while using UCARP for failover

I have SSH installed, and UCARP configured to fail over a virtual IP when one of the two boxes goes down. The problem that I'm having is when a VM is running, and the ucarp interface is active ...
2
votes
0answers
74 views

Can't update smp_affinity

As part of the experiments that we are running to optimize the performance of the applications on our Linux box we are trying to assign all the network interrupts to a single cpu core. Unfortunately, ...
2
votes
0answers
248 views

Linux - TCP Source Port Reuse (and delay)

We have an application making a lot of calls to a remote web server/service. Client app is JBoss/Java on Linux (Red Hat 5), remote server is Windows 2008. There is a Cisco ACE in the way but there ...
2
votes
0answers
137 views

Convert single O/S disk to RAID 1 - Ubuntu 12.04 LTS

I have a server running Ubuntu 12.04 LTS with only a single drive. There are 2 more empty hot swap bays in the chassis. I want to add a little redundancy by adding a RAID 1 to the system. The ...
2
votes
0answers
85 views

Redhat 6.4 configured to log Martian packets but is not logging ll header

I am trying to investigate the source of martian packets I have been seeing on several servers connected to the same subnet. The logging of martian packets has been enabled in /etc/sysctl.conf. ...
2
votes
0answers
95 views

NFS showing files in directory, but can't open or stat

I'm using a network of Linux (Debian Squeeze on kernel 2.6.32) machines, sharing files using NFS (v3). The scenario is that a process running on client A will create a file through NFS on file server ...
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votes
0answers
78 views

Martian Source & Servers losing network

First off, I am pretty new at diagnosing network issues through linux. I have an intermittent problem with our LAN servers. They seem to lose all connection to the network and if I disable the adapter ...
2
votes
0answers
405 views

10GbE be2net low pktgen performance

I am testing the network performance of two workstations, each having 2.4GHz Xeon quad core processors and NC550SFP PCIe Dual Port 10GbE Server Adapters, linked back to back. I've checked the ...
2
votes
0answers
281 views

Almost All Xenserver Logical Volumes Disappeared - Recovery?

We had a hard disc crash of one of two hard discs in a software raid with a LVM on top. The server is running Citrix xenserver. On the hard disk which is still intact, the volume group gets detected ...
2
votes
0answers
42 views

Rsyslog : copy with changing the facility

I have saslauthd with save the logs in LOG_AUTH in our rsyslogd server. It can't be changed without recompiling, and I don't want to do that. I would like to see all the LOG_AUTH in LOG_MAIL, because ...