Questions tagged [linux]

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

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Using LINK_REQUIRED parameter with wicked

I'm running SLES 12 and trying to configure network interfaces; this is my first experience with wicked. I'm using "ifup" to up the ethernet devices. I ran into an issue of not being able to ifup the ...
jetson23's user avatar
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854 views

Is ext4's feature of "reserved blocks" broken?

I could not find more information and reading the code makes me think I'm running into a compatibility issues. Here's the story: This is in a virtualized multi-tenant environment. We've been trying ...
Theuni's user avatar
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What do you use to monitor and deploy linux config files? [duplicate]

I'm working in an environment where multiple groups share servers. I was wondering what tools are used to check if configurations files were modified, maybe able to say who modified them, and revert ...
Igor's user avatar
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Linux swapping blocks system (freeze)

I have a problem with my Debian Servers. We run 4 different server which all have Intel CPUs and 128GB of RAM. Two of them run Wheezy, two of them run Jessie. We run a Java software on those systems ...
mr.simonski's user avatar
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441 views

What is the maximum NFS exports possible in Linux?

What is a definitive number for the maximum NFS4 exports possible in Linux? I'll be specific, Centos 7. (which is Kernel 3.10) My searches are turning up numbers from 100-800 (mounted) exports ...
LordTangent's user avatar
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Webservers on multiple subnets behind NAT and DNS

I run a Sonicwall TZ205, and I have different LAN segments setup using ports. I then run multiple VMware servers connected to these ports, and multiple VM guests connected to each vSwitch. I have some ...
ChristopherDill's user avatar
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WinSCP successfully uploads to a CIFS automount but fails on the final rename

One system has CIFS autofs home directories. I can upload files without issue but it seems to be failing on the final rename: But I can see the file uploaded, just with the .filepart extension: The ...
Bratchley's user avatar
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Apache is using 100% CPU even with one user

Apache is using 100% CPU even with one user Apache (or should I say PHP through Apache?) is using 100% CPU for few seconds every time somebody search bugs at our bug tracker or just reload the search ...
Hamma's user avatar
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redhat satellite + downgrade procedure - how

I used the RHN - red-hat satellite version 5.x in order to install errata patch: ( on linux version 6.x ) glibc-2.12-1.166.el6_7.7.x86_64 while the curent patch on my linux was: glibc-devel-2....
yael's user avatar
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ssh -Y using Cygwin/X without needing xterm

I manage a large farm of Linux servers/desktops from a Windows desktop machine and would like to reduce the complexity of this task by not having to use xterm for X Forwarding. This is my setup: I am ...
Daniel Ball's user avatar
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Is it possible to extend the data device of an Thin Provision pool setted by device mapper?

TL;DR : How can I extend the Thin-Pool if I'm not using LVM but Device Mapper itself directly? Detailed version: As far as I know, when we create a thin-pool by dmsetup, we can set a ...
Ruinland's user avatar
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Traffic control

Good day! I am using Traffic control on ubuntu 14.04 for shaping bandwidth for rate 5Mbit/sec. After some time I would like to change the rate. As fas as I understand I can do that with "change" ...
Ekaterina Pakulova's user avatar
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1 answer
207 views

Run command in screen when LSB initscript stopped

I'm trying to get a Bukkit server to run inside a screen as a service, started from an LSB script but I cant get it to stop correctly. What I essentially want it to do is reattach the screen and send ...
bhygate's user avatar
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Reducing inodes usage on vServer

On my Linux vServer the inodes are limited (maximum is 250k). I found that an Yii2 (PHP, MySQL, composer) installation requires quite a lot of inodes. The number of inodes is roughly the number of ...
WeSee's user avatar
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Printer stops working after reboot

Problem with Samsung printer driver installation. In a nutshell: one thin client (O.S Suse Linux) one usb printer (Samsung ml 1640) After installing the specific manufacturer driver, the printer ...
nansen's user avatar
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IP Multicast between Windows and Linux

Our team is developing linux/windows applications for our network that are talking to each other via multicast. We had it working when we only had linux boxes on the network, but we recently added a ...
dberm22's user avatar
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apache server takes very long time to establish a connection with ssl

I am running apache-2.4.7 with Ubuntu 14.04, I have 2 cores, 2GB RAM on my server. I have ssl enabled and activated on my website. I usually push notifications to users, so sometimes maybe 150-200 ...
Abdullah 's user avatar
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1 answer
72 views

Can ISIC Malformed packets be routed through an ILO or IDRAC Management port

ISIC generates random IPs so it is possible for malformed packets to be routed through the management port and out into the private and / or public network. If I disable the management port and use ...
PRE's user avatar
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2 answers
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routing nginx request through index file

I would like for nginx to process: http://dev.mydomain.com/about-us as http://dev.mydomain.com/index.cfm/about-us While loading the index.cfm file, Nginx must also pass along the "cgi path info" (/...
Brian FitzGerald's user avatar
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How to prevent persistent naming of network interfaces, like eth1

I have a freshly installed Debian Jessie. I had two NICs, which were eth0 and eth1, now I took out one, however I still have eth1 left in the system: % dmesg ... tg3 0000:03:00.0 eth0: Tigon3 [partno(...
Mark's user avatar
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I am getting following error while restarting MariaDBgallera cluster''WSREP has not yet prepared node for application use''

I am running MariaDB Gallera 10.0 in Ubuntu 14.04 Server with 3 node, While Data inserting happening in the server if I restart the mysql server in any of the 3 nodes I am Unable to bring back the ...
prasanth cr's user avatar
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665 views

memory usage reporting by kernel in log when task is killed due to OOM

My task inside Docker container are getting killed due to OOM. Here is a log from /var/log/messsages. Feb 17 19:01:24 ip-10-0-1-85 kernel: [16211.346602] uwsgi invoked oom-killer: gfp_mask=0xd0, ...
Aldarund's user avatar
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Swap HDD in bcache

I have a bcache setup involving an SSD and HDD. The HDD is starting to fail and I have a replacement on order. What is the best approach for exchanging the HDD? I have a thought that I could: ...
pauldoo's user avatar
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Sending Ping at fixed packet size as jumbo frame is not working in linux

I have to hosts connected each other with ipv4 address each other. I modified the MTU of each one to 9000. Then I want to send a Ping request at fixed packet size +1500 to verify that can send and ...
JeanCarlos Chavarria's user avatar
1 vote
1 answer
517 views

CentOs server intermittent long response time. [atop screenshot included]

I am in charge of a website that has about 150 unique users a day. The website hosts forms and gauge data, providing calculations and alerts. It runs well, but for some reason there are intermittent ...
IT_Guy's user avatar
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1 vote
0 answers
521 views

UC Davis (1.3.6.1.4.1.2021) MIBS not working with SNMPv3

I made a SNMPv3 setup in order to test how it can be integrated with some third party scripts. I need to use some of the MIBS from 1.3.6.1.4.1.2021 in order to do this but couldn't manage to ...
Sebastian Strajan's user avatar
1 vote
1 answer
768 views

Upgrade PHP from 5.3 to 5.6, unmet dependencies

I have a OVH VPS which runs php 5.3. I would like to update to php 5.6. I've used this solution (How do I upgrade from PHP 5.3 to PHP 5.4.6 in Ubuntu?) : sudo add-apt-repository ppa:ondrej/php5-5.6 ...
Reveclair's user avatar
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Permissions denied to directory owned by a user

I have a similar problem to that posted here, in that a user is unable to access the contents of a directory they own. A quick search shows quite a few other similar questions, however the problem ...
Dan's user avatar
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727 views

SYN flood on mysql server

Consider this structure: DB <-TCP3306- WEB{1,2,3,4} All servers are CentOS 6/7 Web servers are running PHP (using php-fpm) that connects to the MySQL server. Occasionally, I get this error ...
Nitz's user avatar
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How to change $PATH for crontab in Opensuse [duplicate]

I have a script written which works perfect on terminal however gives error when called through crontab. It took me a while that the problem is with the cron environment not my script. so I tried ...
learnningprogramming's user avatar
1 vote
0 answers
566 views

How does Qemu handle memory?

I'm having a real hard time understanding something and I was wondering if anybody has any experience with this and is able to help. I have two KVM VMHosts, one running qemu 2.4.1 and the other ...
user165222's user avatar
1 vote
1 answer
228 views

Identifying files being actively written to CIFS share

Is there a way to identify files that are actively being written to a CIFS mount in Linux? I am interested in skipping those files. My first thought would be to fine tune the find command with mmin....
steelcityamir's user avatar
1 vote
1 answer
1k views

Server becomes unresponsive [closed]

Our database-server sometimes become unresponsive. It runs a fully updated Ubuntu 14.04 LTS. Notable non-vanilla software running on it are Nimbus, TSM and Oracle. About once a day, it becomes ...
Henrik Kjus Alstad's user avatar
1 vote
0 answers
77 views

DHCP: bad configuration fixed-address?

My configuration of DHCP is: dns-update-style interim; default-lease-time 86400; max-lease-time 86400; authoritative; log-facility local7; subnet 192.0.1.0 netmask 255.255.255.0 { pool { option ...
Kintaro Oe's user avatar
1 vote
0 answers
2k views

overlapping subnets - how to give one precedence?

I have Linux devices with a single ethernet interface and two IP adresses. The first (eth0) is statically configured to 10.1.1.146/24. The second (eth0:1) is configured via DHCP and it may happen ...
Udo G's user avatar
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1 vote
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799 views

How can I distinguish between SAN zoning and LUN assignment issues on RHEL6?

From Red Hat Enterprise Linux 6 how can I tell the difference between a SAN zoning problem (e.g. cannot reach the storage at all) versus a LUN masking issue (e.g. LUNs not assigned to the right HBA ...
Steve Bonds's user avatar
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1 vote
1 answer
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high memory usage on amazon linux

I've observed high memory usage at amazon ec2 instance using amazon Linux. See attached image. Top 25 processes shows < 1GB of memory, but free -m says ~ 3GB is consumed. I've already visited ...
Piyuesh's user avatar
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1 vote
0 answers
1k views

Squid stop working,constantly freezes

I'm running Squid v. 3.3.11. I have around 150 active users. The machine physical resources are more than the recommended. I don't use the cache function, so it is turned off. The problem is when I ...
aleksei stukov's user avatar
1 vote
0 answers
296 views

HighPoint RocketRAID 2740 passthrough

I'm currently extending my server and about to buy a HBA. I stumbled across the HighPoint RocketRAID 2740 which is quite cheap at the moment. I am going to extend an existing MDRaid + LVM ...
Thalhammer's user avatar
1 vote
0 answers
2k views

ERR_SSL_VERSION_OR_CIPHER_MISMATCH

I have set up my SSL configuration in an Azure Ubuntu VM using Tomcat8. The service seems to be running on port 8443. I have created an endpoint on Azure from public port 443 to 8443. However, when ...
Arturo's user avatar
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1 vote
0 answers
719 views

Duplicate SYN package forwarded by Docker?

I'm experiencing a strange interaction between a CISCO firewall and my Docker host connected to it: the CISCO periodically marks my host as a SYN attacker and shuts my ethernet port down. I've been ...
Federico Bonelli's user avatar
1 vote
0 answers
66 views

Multiple VPNs - can't activate more than one

I have a small problem. In my setup (linux, kernel 3.10.17) I have one ethernet port and multiple WWAN interfaces; each WWAN has its own VPN already activated. The VPNs are connected to the same ...
frarugi87's user avatar
  • 111
1 vote
1 answer
3k views

Heavy load (100% ni) and CPU load average is 42.61, 42.24, 42.23

Machine: 8 Core processor with Centos 6.7 top command result I am using node.js, PHP-FPM, NGINX, Redis, MongoDB. I have checked with stopping all services created my me and PHP-FPM, NGINX, Redis, ...
Sham's user avatar
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1 vote
0 answers
99 views

What is the meaning of CalendarServer's sudoers.plist?

Apple's CalendarServer requires a file called "sudoers.plist". According to the vast majority of installation tutorials, this file is to be taken from the examples without any further modification. ...
Mantriur's user avatar
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1 vote
0 answers
1k views

Routing host traffic through Linux KVM (pfSense) router

I have a pfSense virtual machine running on a CentOS 7 host. The host has 2 network adapters, enp1s0 and enp3s0. enp3s0 is connected to a bridge br1. My pfSense virtual machine is also connected to ...
brooksaar's user avatar
1 vote
1 answer
267 views

New Swap Drive - Linux Hangs during Boot

An application checked the swap space during install and required it to be the same amount as ram. So i added a new disk (Server is a VM) and done the following: swapoff /dev/mapper/ol-swap vgcreate ...
embedded's user avatar
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1 vote
0 answers
502 views

How I can reduce disk IO in MySQL 5.6.26?

I was using MySQL version 5.1.52 for my application but recently I have updated it to 5.6.26, but now I am facing very high disk IO. Following are system configuration: OS : Linux 2.6.39.4 RAM : ...
purvesh pardeshi's user avatar
1 vote
0 answers
388 views

Why do nping packets with correct MAC and wrong IP do not reach the other container on the same net?

I have a Docker network with two containers in it. When I run nping with a fake target IP address and a real MAC address of the second container, the packets appear in the tcpdump -eni eth0 output ...
Necto's user avatar
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1 vote
1 answer
1k views

ssh command without tty hangs

I'm trying to execute a simple ssh remote command from my local machine to an AWS instance, by running: ssh -i /my/key.pem ec2-user@<myhost> 'ls -l' When I do this, the command returns with ...
Jeff Storey's user avatar
1 vote
1 answer
2k views

VRF-like multiple routing tables on Windows

Does modern Windows kernel support some kind of VRF-like (or Linux network namespaces) multiple routing tables? I am considering a Windows server with 5 NICs. Every NIC attached to its own VRF ...
Everton's user avatar
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