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

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Remove locking from executed elf file on linux ext4?

After starting some elf file that is on ext4 filesystem it is locked for writing but can be removed and rewritten. On some other filesystem this behaiveour can be different - i have tested ...
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0answers
18 views

How to kill VM task 'Create Virtual Machine' in VMware EXSI server?

Folks, I tried to create one WIn server VM in ESXI server, But Its status is 'IN PROGRESS' for long time. Please help me kill this task. Create virtual machine 10.200.216.35 In Progress root ...
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1answer
50 views

Forcing OpenLDAP connections to use STARTTLS not allowing user to login

I have a basic OpenLDAP server running on Ubuntu 16.04LTS which authenticates users perfectly fine but I really wanted to make it more secure so I decided to use STARTTLS and How To Encrypt OpenLDAP ...
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1answer
34 views

How can I allow all users to run mount as root?

How can I allow all users to run mount as root? I know there's a lot of solutions out there recommending the following edit, but it's not working for me. I've edited /etc/sudoers to include: ALL ...
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1answer
43 views

How to verify if an rpm was installed from scratch or upgraded?

we installed the following rpm's via yum on redhat version 5 # rpm -qa --last | head -10 kernel-headers-2.6.18-408.el5 Wed May 18 13:33:59 2016 bind-utils-9.3.6-25.P1.el5_11.6 ...
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2answers
31 views

How to remove SWAP partition, and add back to root partition in cli

I am on Ubuntu 14.04 server with only ssh access into the machine in question. Someone else setup this machine, and they added a ridiculous swap space...a little more than half of the SSD. Here's ...
1
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1answer
26 views

grep command to extract data from a file

I have a file that has this line in it: $n22(s:Tstring) = "252"; I'm trying to write a shell command to grep the file and only return 252. This is what I have so far: grep -o ...
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1answer
33 views

LVM file locking error after moving extents to new physical volume

On a CentOS 6.7 system, I started getting SMART errors on a disk that was part of a volume group under LVM. So I used the recommended procedure: add a new disk to the system, create a new physical ...
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22 views

Should NFS consecutive writes then reads be consistent across hosts?

For $work I am writing several thousand files to a directory mounted on NFSv3. Once the process writing the files has completed, a process on another machine starts to read them. The problem I am ...
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0answers
14 views

Walking an SNMP tree: any way to include additional information?

I'm exploring an embedded device that has a custom MIB. The MIB has nicely-written DESCRIPTION properties for each OID. Unfortunately, snmpwalk seems to ignore the DESCRIPTION properties. Looking ...
1
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1answer
38 views

DNSsec responses from named / bind intermittently has RRSIG records missing

Responses from our nameserver are intermittently missing RRSIG records despite being requested. All other associated records (such as A records) are returned OK. Consequently dnsssec validation fails. ...
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1answer
56 views

MQTT certificates verification fails

I'm been desperately trying to get my MQTT clients to connect to my MQTT broker which is set up with a certificate from a CA (Letsencrypt). To be able to get the CA certificate, I've used the ...
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1answer
20 views

Build rpm on CentOS for RHEL

I need to install some software which is not available pre-compiled on a client's RHEL Server. I decided to create a rpm for easier installation on multiple systems. As i have no RHEL subscription, ...
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0answers
37 views

MYSQL very slow on a huge server

I have an ecommerce with a lot of products (more than 100K). And around 2000 visits every day. My Database is very slow, but I have a huge server (for this amount of visits). Server: 16GB Memory ...
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0answers
8 views

File /etc/ld.so.nohwcap is missing in Debian 7 [migrated]

What is the file /etc/ld.so.nohwcap used for?. In my machine (Debian 7), this file is not found. Therefore, Which package or library this file belongs to?
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0answers
13 views

No space left on device + ubuntu [duplicate]

I've been working with an Ubuntu server machine with a HD of 60GB and a memory of 16GB. I've been running WSO2MB in the server in order to publish and consume messages. I got this strange issue where ...
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2answers
36 views

How can I detect what occupied the disk space

I have my external disk mounted in /log and I'm not able to write into it anymore because it's full. When I check with df -h: Filesystem Size Used Avail Use% Mounted on udev 3.7G ...
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0answers
24 views

ZFS Snapshot showing unreachable inside snapdir

I am using ZFS with Linux 3.19.0-58-generic. I have created some snapshots, but when I cd into these directories after one point it becomes unreachable, what does that mean ? Is there any workaround ...
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0answers
5 views

setting default total server quota and server admin quota virtualmin

I am trying to find out how to configure the default settings for creating a virtual server in virtualmin. When I click 'edit virtual server', underneath 'quotes and limits' there is 'total server ...
1
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1answer
183 views

Huge performance penalty in gbit link with ip forwarding / masquerade through clear VPN tunnel

I have a problem with IP forwarding between my home computer and a remote server (from online.net). My home connection is a 1 Gbit/s FTTH and the remote server has a 2.5 Gbit/s bandwidth. The context ...
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1answer
32 views

How to use dd to dump an image to unallocated space

I have a bin file (chromiumos_image.bin) which contains some (around 12) partitions, which I need to dump into the unallocated space between 2 other partitions. The partition table is this: My ...
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1answer
56 views

How to identify if a process is unique vs a coincidental same PID?

Having the ability to identify a PID for a process, let's say HTTPD for example, how can I determine later on, on that same server, if that PID/Process is still the original one ? For instance, I ...
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1answer
28 views

Cronjob starts multiple processes

Cronjob creates multiple processes for the same script. One using /usr/bin/php /path/to/php/script And other using /bin/sh -c /usr/bin/php /path/to/php/script These are 2 separate ...
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1answer
26 views

How do I handle messages from my custom application in rsyslog?

I have a Ruby application on my server, let's call it "alpha". The application emits syslog messages with the program name "alpha". I want to separate my log messages into separate files based on what ...
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1answer
23 views

Amazon Linux - expand root partition

I need to expand the root partition '/' on my linux machine to occupy entire available space. I launched a machine with 60 GB storage space. 'lsblk' for my machine is as follows. $ lsblk NAME ...
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25 views

6in4 Tunnel with /80 Addresses

I want to setup my own 6in4 tunnel server on CentOS 7, my VPS ISP can only provide a /80 IPv6 block addresses while I can see most of tutorials said it requires /64 for client's DHCP server to work. ...
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35 views

Configuring vxlan unicast in linux

I want to try vxlan unicast and configured following configurations in Fedora 23 VM1(enp0s8) ========= (enp0s8)VM2 ip address add 100.1.1.1/24 dev enp0s8 ifconfig enp0s8 up ip link add name vxlan42 ...
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2answers
28 views

Rsyslog pull tools or strategy

I would collect the log(in particolar auditd but also other syslog log) produced by several linux server in a centralized syslog server installed in a linux server. I would configure the centralized ...
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0answers
23 views

apache2.conf write global redirect for all sites hosted on server

I have been trying to add rules like the following to the /etc/apache2/apache.conf file but they havent been noticed, whereas if I add them to the individual .htaccess files they are obeyed and anyone ...
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0answers
10 views

Sensu remediation: not able to trigger client

Sensu Monitoring.... Senario: if my http link goes down then i use to manually run the script and start it. we moved to Sensu recently as its GUI and monitoring system is quite impressive ,I tried ...
0
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1answer
38 views

Postfix can not receive mail with error: amavis[15499]: () (!)DENIED ACCESS from IP x.x.x.x, policy bank

My mail server ran very well. But after my setting an OpenConnect VPN on the mail server, I found the server could not receive mails from outside. For example, my host IP is 1.2.3.4 I did tail -f ...
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3answers
64 views

scp to copy file to remote server fails because of permissions

I think my fundamental problem is that I don't fully understand how ssh / scp works. But I don't what to google to try to read up on my question. Problem Description I have created a bash script ...
1
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1answer
32 views

Linux adding a bad route on startup?

I've got several Linux (Debian Wheezy) machines that have a peculiar problem. After booting them up, an extra route is created that has to be deleted before the machine can talk to other machines on ...
0
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1answer
47 views

FreeIPA in LXD/LXC containers - cannot switch user

The Setup consists of one FreeIPA-Server and one Client, which both reside in unprivileged LXD-Containers on the same Host. Both containers and the host machine run Ubuntu 16.04. All Settings are ...
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5answers
54 views

How do I increase a partition size (that doesn't use LVM) without removing and re-adding it

I have /usr on a separate partition. At the moment, this is how the server is set up: [root@localhost ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/sda2 4.9G 329M 4.6G 7% ...
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2answers
29 views

Rsync to remote server and change file / directory ownerships

I am using Rsync to deploy to a remote server, which is working. However the file and directory ownership always replaces old files with root:root I need the ownership of all files and folders ...
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0answers
20 views

Cannot run pNFS block layout on Linux

I try to run pNFS on Linux with 3 node (all nodes are Debian 7, kernel linux 4.6.0) : Data Server: iscsitarget is installed on this node, it share a LUN Meta Data server: In the kernel config, I ...
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0answers
19 views

Detecting what causes my web server to crash intermittently [duplicate]

I have a Fedora server running a few production websites on apache with a MySQL database all on the same server. Every few weeks the websites will become unavailable and I can't SSH onto the server. ...
0
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3answers
50 views

Linux kernel decision making process for routing table

I have question about routing procedure in linux kernel . Below is the version I am using. [root@server230 ~]# cat /etc/redhat-release Red Hat Enterprise Linux Server release 7.1 (Maipo) ...
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37 views

Cannot run ctl on Linux for pNFS

I want to install pNFS server. I install ctl from source code. But when I run command ctl -u, the error below occur: /proc/fs/pnfs_block/ctl: No such file or directory I run linux 4.6, the ctl ...
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1answer
22 views

Unison / file syncing between servers without using root account

I have setup 3 servers one with a load balancer and the other 2 will host the websites files and I have a replicated MySQL database on both too. I have installed ispconfig on both and it's set to ...
2
votes
0answers
29 views

Throughput dropped when using two ethernet ports simultaneosly

I have a board based on Altera Cyclone V, its ARM SoC is clocked at 800MHz, the boardd has two 1Gbit/s ethernet ports. When I benchmarked the throughput of a single port using iPerf, I managed to get ...
0
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1answer
98 views

Iptables source mac match not always matching?

I have added some rules to my PREROUTING chain in NAT. Usually at the beginning of a new machine joining the network, these matches don't always match correctly? Im using iptables v1.4.21 on OpenWRT ...
3
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3answers
121 views

Can not kill process with kill -9

I can not kill one process with command kill -9, is there any way to kill it without restarting the machine?
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2answers
31 views

How to mount the dd image of a swap file

I have several dd images from a single drive. One of them is the swap. I mounted all of the images in Ubuntu just fine except for the image of the swap. This is how the dd images break down: hda8 is ...
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0answers
28 views

linux veth use existing peer interface

I have a sit tunnel interface which I want to transparently connect with one end of a veth pair so that everything that drops out of the tunnel interface flows through the veth interface and vice ...
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1answer
65 views

openvpn route ALL traffic through VPN but through particular client (not server)

I have managed to setup a configuration where specific routes are routed through a particular client . For example I setup route X.X.X.0 255.255.255.0 and in the client A iroute X.X.X.0 255.255.255.0 ...
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0answers
9 views

How to debug kernel panicswhen using Adaptec Arcconf to query RAID controllers

I've got a system with an Adaptec 6805, running CentOS 6.6, which is having kernel panics in the aacraid driver if I call the Adaptec arcconf command line utility too much (basically, every day or ...
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0answers
48 views

Network Unreachable when configuring static route

root@vpn:~# route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface ..... 10.0.0.0 10.0.0.1 255.0.0.0 UG 0 0 0 ...
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2answers
51 views

High CPU load of my VPS [closed]

I use VPS from digitalocean. The configuration is: 8GB RAM, 4 Core Processor, 80GB SSD with cpanel installed. Most visitors are in the site http://www.secretdiarybd.com/bn . Which is on wordpress ...