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

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How to set up automount from a Mac to a Linux server

I've been trying to solve a rather simple problem: my server runs Debian there is a user A on the server that belongs to a group G (both 1001) my client runs OSX there are users A and B on the ...
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12 views

Can't write to a virtual com port on ubuntu

I'm running an ubuntu VM on hyper v and I need the ubuntu install to be able to access a local com port on my VM host. Unfortunately this isn't possible with hyper-v. So using Com by TCP I'm ...
3
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1answer
191 views

Reduce writes from a specific application?

I'm logging the output of a command with command | tee file This causes tee to actually write to the disk every second or so. I'd like to reduce the frequency of the writes, by caching the output ...
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11 views

Attach X2Go to X Session “:0”

I don't know if I'm right in concept. But when I connect to a remote host (a cloud VPS) by X2Go, $DISPLAY variable echoes ":50", I need that variable equals to ":0" when I connect to that host. How ...
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21 views

Sending duplicate packets to the wan ip address

I'm in need to send duplicated packets to the remote host (wan ip address). I'm aware that -j TEE would do just that on the LAN, but what about WAN? iptables -I POSTROUTING -t mangle -d x.x.x.x -j ...
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2answers
37 views

Linux Hostapd registers as WEP, but I want WPA2-PSK

as usual to respect the community, I have traversed a bajillion articles and re-read the manual and still can't seem to get past this issue. I'm trying to create an access point in Linux(linaro on a ...
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2answers
66 views

How can I find out if a port on a remote server is open as well service listening status on it?

I want to check if a set of ports are opened or closed on some remote servers. I went through various discussions on the subject and most of the people suggested to use nmap, nc and telnet ...
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1answer
12 views

Unable to extend volume on Suse VM

I have a SUSE VM (11.4) that I increased the disk for. I am following the guide (http://www.techrepublic.com/blog/smb-technologist/extending-partitions-on-linux-vmware-virtual-machines/). This added ...
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1answer
18 views

Why my disk elevator is set to “deadline”

I have CentOS 6.x Linux server with kernel 2.6.32-573.8.1.el6.x86_64. I did some checks today and I found that disk elevator is "deadline". [root@srv ~]# cat /sys/block/sda/queue/scheduler noop ...
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24 views

linux tc qdisc pie (aqm) configuration with limited bandwidth

I would like to configure AQM PIE by using tc-qdisc, but at the same time I would like to limit the bandwidth to 1Mb/s. I have used similar configuration with fq_codel, i.e. I have limited the ...
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1answer
28 views

How to set the minimum acl permissions for an user who is included in two or more user groups with different permissions in linux?

Say, I have two groups G1 and G2 with user1 as member to both. G1 has rwx permission on a file file1 and G2 has only read permission on the same file. Setting G2 as the primary group for user1 does ...
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1answer
178 views

How to extend LVM PV to the beginning of disk?

I have server with 2TB disk, that someone initially partitioned like this: 300GB standard primary partition for operating system files(CentOS 7). 1.7TB LVM with some pretty big logical volumes - for ...
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0answers
21 views

Get other (namespaced) PIDs of a linux process

So I have processes running in different linux namespaces. I sample events with perf to find a performance problems. Now I want to figure out, from the "host", what PID y a process running under PID ...
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24 views

Cant change user quota on xfs partition

I cant change user quota even command exit status is 0. Used: xfs_quota -x -c 'limit bsoft=1024m bhard=2048m 56a4d3057ec81767ebe0415b' / Also used webmin interface to update user quota but on ...
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1answer
15 views

PPTPD-server split tunnel

Normally the client has to set up the VPN connection to be a split tunnel (not routing internet traffic trough the tunnel, but still have access to local resources), but is this possible to define on ...
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27 views

linefeed in bash script - to email [migrated]

I am doing printf to a logfile and having that logfile send through mailx, however, it seems that the linefeed "\n" are not recognised or captured in the mail. Snippet of script as below (notice the ...
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1answer
25 views

logrotate frequency - when and from when

if have lograte in my daily cron /etc/cron.daily/logrotate -- assume cron.daily is run at 1.05am daily and if my logrotate config has a weekly settings Does it means that my logrotate will ...
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1answer
31 views

Linus virtualserver - multiple URLs and IP address

I set up a Linux virtualhost on server with IP address 888.888.888.888 where document root for URL site1.mysite.com is /var/www/content1 and document root for URL site2.mysite.com is ...
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1answer
29 views

Windows cannot connect to Enterprise WPA2 WiFi access point with EAP-TTLS PAP authentication using freeradius

I was working on having an Enterprise WiFi access point where my clients need to enter username and password (which are in OpenLDAP directory), using AES, TTLS PAP. I setup my freeradius according to ...
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0answers
9 views

Mailman 3 - editing the welcome.txt via the rest API

Thanks for reading my post. I will explain my situation and then at the bottom explain what my question is regarding my situation. There is a .txt file configured in mailman to send out to users as ...
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18 views

how to assign failover ip into windows vm (ubuntu, kvm)

I purchased a dedicate server (Ubuntu 14.04 LTS amd64) with a failover ip from online.net. And i want to setup a windows vm with failover ip using kvm. I tried myself several times, but all failed. ...
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18 views

Debian Mysql 5.6 and MariaDB Instances on Same Server

I'm trying to have Mysql 5.6 and MariaDB to make comparison and track performance between each other. Everything i have found over the internet was this link: ...
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1answer
14 views

Cannot connect with WPA2 ((AES)) algorithm + EAP-TTLS PAP with freeradius auth

I setup successfully an enterprise wifi connection with LDAP authentication by the mediation of Freeradius. I used EAP-TTLS PAP because I have hashed passwords in my OpenLDAP directory. In case I used ...
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32 views

Finding the serial number of hard disk drives on a SuperMicro server running MegaRAID SAS 8708ELP

As the title says, I have under my care a SuperMicro server running a hardware RAID 6 with a MegaRAID SAS 8708ELP on Linux. I have two failed disks that I have identified as the drives in slot 2 and ...
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2answers
31 views

Mount Point Does Not Exist, Despite Creating It

I'm trying to install Arch on a Virtualbox VM. I'm following along this guide, and this video. Not sure if relevant, but the VDI file is on an external hard drive. I've created 3 partitions as per ...
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1answer
45 views

Forcing IP fragmentation and reassembly for some traffic thru a VPN tunnel

Is there a way to force IP packet fragmentation before they go into tun0 and then force reassemble them on the other side of tun device? I have some IPSec traffic that I can not control, and it wants ...
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20 views

Debian Preseed: Installation process stuck at 18 % at finishing-installation

My Preseed installation of Debian is stuck at 18 % and i don't know what's wrong. Can you help me please? Here is syslog screen: Syslog Here is my preseed file: #C ontents of the preconfiguration ...
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25 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 ...
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21 views

Units for size in /proc/partitions don't make sense

I have a Seagate 750GB drive. Parted shows the drive as 750GB parted /dev/sdc print Model: ST375064 0AS (scsi) Disk /dev/sdc: 750GB Sector size (logical/physical): 512B/512B Partition Table: gpt ...
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1answer
31 views

route table issue when I appended option net.ifnames=0 to grub2

I appended two options net.ifnames=0 biosdevname=0 to grub2 because I want to change default network name to old name eth0 on RHEL 7. After that, I edited /etc/sysconfig/network to set default ...
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25 views

OpenVSwitch: Understanding network/bridge - no packets

I just plan to have more security and monitoring at my firewalls isp-interface. Using Virtualbox to test, I installed openvswitch, created a bridge named ovs-br0 and added two ports, one, the existing ...
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6 views

Create a Linux-compatible image of a block device under OS X [closed]

I'd like to take an image of my OS X bootable USB drive that I can install to different, similarly-sized media if my Mac becomes non-operational. I'm not sure if Disk Utility to make anything but DMG ...
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1answer
23 views

Why doesn't my linux hyper-v guest display its ipaddress in hyper-v manager

I'm running Windows 8.1 Enterprise edition using the built-in Hyper-v manager. I can run linux guests no problem. However in the manager it wont display the ipaddress. Windows vm guests do display. ...
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1answer
34 views

How to run multiple playbooks in order with Ansible

I'm working on several Ansible playbooks to spin up a new server instance. There are approximately 15 different playbooks I need to run in a specific order to successfully spin up a server. My ...
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1answer
31 views

Centos requires me to change my password while I'm using private keys

I tried to login to my remote CentOS server using my private key and I was surprised to get this message : There were 29031 failed login attempts since the last successful login. After that it ...
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1answer
44 views

Can I remove a directory “Cancer ” and leave all other sub directories intact for directory “/home/John/Cancer/MillionDollars”?. Bash / Linux [closed]

Get rid of directory “Cancer” but keep directory “Million Dollars” Directory: /home/John/Cancer/MillionDollars Desired Directory: /home/John/MillionDollars This is for later ...
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1answer
20 views

Enabling STARTTLS for all on Postfix with Zarafa

I ran into a problem which I just cannot solve with just googling it - I need some expert help. My company runs it's own mailserver (postfix with zarafa groupware). We're an insurance company so we ...
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0answers
7 views

mount dvd without eject after burn [migrated]

I have a scripts that write some backups on DVD on a Gentoo system. Initially I gathered the files, create a ISO image, and the burn that image on disk using cdrecord. After the burn process is ...
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2answers
14 views

VMware snapshot + An error occurred while saving the snapshot msg.snap-hot error

I am using VMware version 5.5 (that manage 57 different VM Linux machines –red-hat version 6 until 7 ) In the VSphere Client (tasks and event), I saw the following error: (on Linux machine name – ...
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2answers
4k views

Does memtest86+ test memory which is used to run itself?

One of the common server failure scenarios is bad DRAM, sometimes even when ECC memory is used. memtest86+ is one of the most useful tools to diagnose DRAM problems. As it loads itself at the start ...
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16 views

How to add multicast IP address to multicast group on linux

How to add multicast IP address to multicast group on linux? I am trying to edit /proc/net/igmp file, but it is read only, or there is other way. Thanks beforehand.
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0answers
9 views

How to install a 32-bit JVM on RHEL 7 [duplicate]

Does RHEL 7 support a 32bit JVM? If so, how can I install this onto my RHEL 7? I have a business application that only has 32-bit libraries that I need to run.
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How to run 32-bit Java applications on Red Hat Enterprise Linux

I have a Java business application (its an old application) that has 32 bit libraries. I want to run it on a 64bit Red Hat Linux Server. Whenever I do, I get Exception in thread "main" ...
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21 views

Grub Rescue, always getting unknown filesystem

After launching fsck command and rebooting a Debian server, i run into grub rescue mod. So am trying to recover my system but with nothing when i execute ls i get : (hd0), (hd0, msdos5), (hd0, ...
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Remote IP is running script from tmp folder [duplicate]

No matter how many times i kill the process a remote IP is running few scripts from my tmp folder. The scripts are named easy_setup, setup64, setup32. The content of the file is some dump and cant ...
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9 views

Routing traffic through veth interfaces

I'm trying to route traffic through veth pair on ubuntu 14.04. Traffic flows fine but the problem is that i can't use tcpdump and other tools on the virtual adapter directly because the traffic is ...
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1answer
61 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, ...
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34 views

how to give yes as default option to apt-get install in ubuntu [migrated]

I want to create a script so that I can download and install multiple linux software or packages. When some one download any package using apt-get install command, it asks to enter yes/no to proceed ...
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0answers
18 views

InnoDB file per tablespace

I am using following syntax to create innodb table: create table InnoDB_Test(a INT) DATA DIRECTORY='/var/log/storage/MySQL' INDEX DIRECTORY='/var/log/storage/MySQL' engine=InnoDB; I want to create ...
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30 views

Error while running sqlplus after installing Oracle Client 11g R2 on RHEL 7

I am facing issue while running ./sqlplus command after installing Oracle Client 11g R2 on RHEL 7 here's is the error: $ ./sqlplus ./sqlplus: symbol lookup error: ...