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

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Forwarding udp ports iptables packets “lost”?

I have a Linux router (Debian 6.x) where i forward some ports to internal services. Some tcp ports (like 80, 22...) are OK. I have one Application listening on port 54277udp. No return is coming from ...
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78 views

How to use an encrypted disk without needing an unencrypted boot partition

I would like to know if there is a way to encrypt a linux system which does not require a small unencrypted /boot partition. In addition I would like to know if encryption can be implemented on an ...
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641 views

Can't ping other machines at Linux VPN PPTP server's local lan from outside

Before anything else, hello guys, this is the first time I ask for something here so I hope someone can give me a hand, please look at the following network diagram: ...
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437 views

linux hardware raid 10 / lvm / virtual machine partition alignment and filesystem optimization

I've been reading everything I can find about partition alignment and filesystem optimization (ext4 and xfs) but still don't know enough to be confident in setting up my current configuration. My ...
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363 views

Forward Error Correction for WAN optimization

Anyone know of user-space tools providing forward error correction with/for tunnelling a stream over UDP on Linux? I found Trafficsqueezer, utunnel and toutunnel which implement TCP over UDP, but ...
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128 views

difference between success and failed event in auditd/aureport

The aureport command has two options that limit the list of displayed events to those that were successful and those that failed. Per the man page: --failed Only select failed events ...
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454 views

Bind 9.3 cache-only mode with authoritative name server

I have bind 9.3 up and running which is designed as a cache-only to get queries from other resources and then cache them to serve clients internally, now I setup my own zone because this is also a web ...
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208 views

Xen and Turbo Boost

Running the Debian Squeeze default Xen, I am unable to get any of the CPU frequency scaling stuff going. As soon as I revert to the standard kernel I get it. Digging through the internet it seems ...
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196 views

how to measure IP bandwidth in pass through mode in linux?

I want to measure the IP bandwidth in pass through mode. Please find the attached picture for configuration and my question also. If there is no solution with OpenWRT, I need any alternative ...
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327 views

Ubuntu: How to force default ACLs to take effect for newly created files/dirs?

I've created the following ACLs for a directory: # file: . # owner: www-data # group: root user::rwx user:www-data:rwx user:deploy:rwx group::--- mask::rwx other::--- default:user::rwx ...
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283 views

What ZFS file structure to use for zfs-root linux system?

In ZFS, you can build your filesystem hiearchy to include different fs-attributes per filesystem. For insance, compression in one area, no-exec/suid in others, noatime. For example, a HOWTO for ...
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426 views

NFS inherit permissions from shared directory - Mac OS client

Short question: Is there a way to have files on a NFS share on a Mac OS client inherit the permissions of the shared directory? Scenario: Ubuntu 12.04 server Mac 10.7.4 client shared directory has ...
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6k views

ksoftirqd process overloads CPU with high-bandwidth and multiple network connections

I got a 10GBit Server with proxmox 2.1 installed. There's an OpenVZ container running with Ubuntu 10.04 64bit. I can get 200-300MB/sec with wget from data-center internal servers (-O /dev/null) which ...
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2k views

ProFTPd/FTPS issue: unable to accept TLS connection: received EOF that violates protocol

It took some time while I tried to find solution over the net. Nothing helped. The story: I have Ubuntu 10.10 (Amazon EC2 instance). ProFTPD Version 1.3.2e (latest via apt-get). I changed nothing on ...
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228 views

How to make background flushing more aggressive

I've got a system that is doing a continuous steady stream of writes to GFS2 filesystems, and what happens is that the cache builds up to vm.dirty_ratio and then load skyrockets during a synchronous ...
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339 views

MD Raid can't be assembled

I was running a Raid5 with 3 disks at on my homeserver. But had some problems with the back-plane for the disks. The disks weren't detected reliable. So I replaced the back plane and the disks are now ...
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626 views

does somebody know whether a linux / opensource driver does exist for the apple xserve 3,1 raid controller?

I'm trying to install linux on a apple xserve 3,1 which comes with some strange raid controller that does not get detected by linux. lspci is telling me: 01:00.0 RAID bus controller: Apple Computer ...
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98 views

Linux ftp server supporting millisecond timestamps in transferlog

I'm looking for an ftp server for linux that will satisfy the following constraints Should be able to log when a file transfer (STOR command) is initiated. Should be able to log the time taken for ...
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223 views

Why I get different network traffic values from dom0 and from domU?

I'm using Xen 4.0.1 with Linux 2.6.32-5-xen-amd64 (standard packages on a Debian Squeeze system). From Xen Networking: For each new domU, Xen creates a new pair of "connected virtual ethernet ...
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386 views

Restart linux kernel NFS lockd

Hi is there a way to restart the lockd kernel thread (NFS lock manager)? There were some file locking requests which went wrong and since then it consumes about 50% of CPU. The processes requiring ...
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633 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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210 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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618 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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321 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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301 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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4 views

libexecdir in systemd .service file?

I'm deploying something to machines (internally, not for public consumption) using RPMs. Now, in RPM .spec files there's the %_libexecdir variable. The package deploys a service binary in that ...
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25 views

Ansible 'include' statements and autopath

My ansible's 'include' statement was working fine, but recently after including ymls in subfolder, it somehow brokes the role's path. Here's the tree of my role: . ├── site.yml ├── inventory.ini ...
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29 views

2NIC's with 2 Gateways

I have this setup: 6 machines with 2 NICs each each machine has one NIC connected to 192.168.1.0/24 through a hub. One of the machines is the gateway (192.168.1.13) which has NAT and masquerading ...
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33 views

Use of CPUQuota in systemd

I am trying to put a hard limit in CPU usage for a dd command . I have created the following unit file [Unit] Description=Virtual Distributed Ethernet [Service] ExecStart=/usr/bin/ddcommand ...
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8 views

Allowing users to mount arbitrary directories

I'm attempting to roll out eCryptFS support for users on our RHEL infrastructure. One large snag has come up. Given a user with no root access and (preferably) without the use of sudo, how would one ...
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23 views

Get disk serial number by smartctl under raid0 of LSI

I'm trying to get the disk serial number of disks attached to the Centos server. When there was no raid0 (under LSI), I can get the serial number and model of /dev/sdb by: smartctl -i /dev/sdb and ...
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17 views

Two allowed paths in rsync command in authorized_keys

I have a question about rsync restriction in authorized_keys command. I need to copy files via rsync from one server to another without prompting password. There is no problem, but I need to specify ...
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27 views

Dell r730 + Dell 12Gb SAS + Centos 7 + netvault 9.2 quantum superloader 3 not found

In the above configuration Netvault does not find the library attached to the sas controller. What driver should I see with lsmod for the SAS card? I have: ... mpt3sas 195379 0 ...
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0answers
31 views

Trunk vlans inside openvz container (Proxmox)

I have a node running OpenVZ CT (ProxMox). eth1 on HN are bridged through vmbr1 to veth device on CT101 (eth1 inside container). (Host Node) eth1 -> vmbr1 <- veth101.1 <- eth1 (CT101) No ...
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19 views

Keep file system meta data in cache with vfs_cache_pressure

My Ubuntu Linux (virtual) servers run rdiff-backup daily, which looks at all file meta data to determine what needs to be backed up, slowing it down. It does this every day, even though most files ...
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21 views

IP hashing filter in traffic shaping

I am using a traffic shaping by IP hashing filter. I have Five networks /24 : 192.168.1.0/24, 192.168.2.0/24 .. 192.168.5.0/24 so i create a table with 5 cells and each cells has 256 cells. this is ...
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22 views

cron job sporadically not running

I have a CentOS 6.6 server with the following packages installed: crontabs-1.10-33.el6.noarch cronie-1.4.4-12.el6.x86_64 cronie-anacron-1.4.4-12.el6.x86_64 kernel-2.6.32-504.3.3.el6.x86_64 ...
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33 views

Webserver on linux times out outside local network

Apologies ahead of time if I mess up any terminology here; I am new to this realm. I have setup Jira (bug tracking software) on a linux box in my local network. I have a subdomain ...
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24 views

Linux (Ubuntu 12.04). Setup OpenSSL and osslsigncode

I'm a beginner in using Linux. I have already installed OpenSSL 1.0.1 and after installing osslsigncode I have: osslsigncode -v >osslsigncode 1.5.1, using: OpenSSL 1.0.1 14 Mar 2012 ...
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27 views

Connect to encrypted Windows 2012 samba share on Linux

I have a Windows 2012 samba share set up. When I right click on the share, go to properties, then settings, I have the box checked marked "Encrypt data access" When this box is checked, I cannot ...
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31 views

detecting whether GPUs are accessible before running nvidia-smi during boot to create dev files

In the past, I've successfully configured Ubuntu systems containing NVIDIA GPUs to launch nvidia-smi in the background from within /etc/rc.local during the system boot to create the requisite ...
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0answers
16 views

Process-wide VPN connection via openconnect

I'm using openconnect to connect to a remote endpoint and SSH onto the machine inside the remote network. The problem is, when I do create the connection, the machine I do it on is unresponsive for ...
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0answers
36 views

curl error 51 - of multiple requesting machines, only one has the issue

I have an SSL cURL request that fails from a single machine with the following error: curl: (51) SSL peer certificate or SSH remote key was not OK This error seems to have popped up overnight, and ...
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30 views

Hadoop namenode port getting blocked

I have installed 7 VM instances of Ubuntu 14.04 LTS servers. First instance runs the namenode service and all other 6 nodes run datanode service.I think my NameNode is getting crashed or blocked due ...
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29 views

PCI-E with mPCI-E Sandisk won't boot

Configuring a 'new to me' Dell R610 with 6 15K SAS drives, each set paired up into a RAID 1 and then a Sandisk 256GB mPCI-E ...
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46 views

Not able to set memory limit on containers in docker

I am using ubuntu 14.04 with latest docker. No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 14.04.1 LTS Release: 14.04 3.18.5-x86_64-linode52 kernel But when i ...
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41 views

corosync is not in sync

Could you please help out show me how to form a cluster? corosync & pacemaker are used. two nodes rac0 ip 192.168.0.140 & rac1 ip 192.168.0.142 They are not shown in each other. They are ...
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20 views

X3250 Server: stuck at firmware screen

The server is initialize, then it is stuck at the IBM System X Server Firmware screen (before F1, F12 appears, etc). You can see in the attached image. ...
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0answers
32 views

Gateway/Modem overload when running a web spider

Problem: All other devices on the network experience serious lag and timed out web pages, email, chat dropping, etc while this is running. This is a cross post from stackoverflow, I may have used the ...
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0answers
10 views

Re-install motd after /motd-update directory has been cleaned

I have the following problem. I'm running Kubuntu 14.04 and I deleted the contents of /etc/motd-update folder. I want to simply add a custom ssh custom login message, I don't need the other files. ...