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

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Create a new Linux boot disk using a reference disk?

I need to build a Linux boot disk for a system, but assemble the disk using a different system than the one the disk is for. I have a known-good "reference" disk: is there a way to selectively clone ...
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27 views

Adding network-fault tolerance to drbd or drbd alternatives

I've been working with drbd for about a year now, and at this point I'm tearing my hair out in frustration. Every time there is a network fault (something that is disappointingly common in the ...
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9 views

My email not delivered to inbox [duplicate]

My server sending bulk emails not delievered to inbox of gmail,yahoo. SPF,DKIM,DMARC all are pass. But still i'm facing the problem.Below the email headers. Sending all mails through sendblaster. ...
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1answer
35 views

IPTables: Does blocking spoofing, affect any services? [closed]

Do these rules affect any services/applications? Will apt-get and others still work? - iptables -A INPUT -s 10.0.0.0/8 -j DROP - iptables -A INPUT -s 169.254.0.0/16 -j DROP - iptables -A INPUT -s ...
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1answer
33 views

Error in crontab - bad minute

could anyone give me a clue what am I doing wrong in the crontab below? I'm getting bad minute error... Here the entries: 0,15,30,45 * * * * /usr/sbin/netdate -v time.server.com > /dev/null ...
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22 views

Can't route traffic from Cisco to Asterisk over port 5060

My VOiP provider has informed me that I must route incoming calls from my Cisco router to my Asterisk server to port 5060. I can ping my Asterisk server from my Cisco router fine, there's a direct ...
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1answer
26 views

Correct way to setup linux company share folder with usable permissions

I've just started working for a small company that has a globally shared folder run from an Ubuntu file server (Raid 5, etc) shared by Samba. The workstations (Centos) are all fstab setup to mount ...
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15 views

Easy way to send local configuration to server

Pretend I have setup a server hosting for a website locally (on my Linux laptop), it all works perfectly. It has all of the files for the website, firewall has been setup, apache install etc... For ...
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1answer
58 views

ZFS: i/o error - all block copies unavailable

I am trying to install FreeBSD Sparc64 on my SunFire440 machine, I followed the tutorials to Install FreeBSD Root on ZFS using this tutorial link. Only the changes I made is that instead of using ...
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25 views

Amazon Linux cannot access nginx on port 80

I have installed nginx on my AMI by yum sudo yum install nginx And then, I open all port in my AMI security group All traffic - All - All - 0.0.0.0/0 And then, I start nginx by command sudo ...
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38 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 ...
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0answers
37 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 ...
2
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1answer
61 views

Poor performance with Linux software raid-10

I have a machine with an 8 channel LSI SAS3008 controller chip, and individual drive testing shows I can write to any disk or all disks at between 174 MB/sec and 193 MB/sec with a sustained write ...
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1answer
23 views

Find and replace text (multichars) in .js files on Linux

I have many .js files named the same (got.js) where i just need to find and replace some text on them. The text to find is: \x72\x6Fx75\x6E And is to be replaced with: \x72\x6F\x75\x6E (just a \ in ...
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20 views

mixed storage types for swap

My shop utilizes mixed storage types for swap. We have limited fast virtual ram drives and more abundant cheaper slower disk space, all on the same system. I can prioritize the order in which the ...
2
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1answer
31 views

Security implications when only allowing logins via key and UsePAM setting is 'yes'?

When setting up a new server, I generally want to allow logins only via key authentification and not from the root user. Therefore, I edit the sshd_config like this: I change 'PermitRootLogin' to ...
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0answers
77 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 ...
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0answers
32 views

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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0answers
13 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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0answers
12 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
67 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
14 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
29 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 ...
4
votes
1answer
180 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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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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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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0answers
19 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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0answers
35 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
46 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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22 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 ...
2
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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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0answers
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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7 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
24 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. ...