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

learn more… | top users | synonyms (1)

46
votes
8answers
52k views

How do I find the UUID of a filesystem

I'm running Ubuntu, and want to find out the UUID of a particular filesystem (not partition). I know I can use e2label /dev/sda1 to find out the filesystem label, but there doesn't seem to be a ...
40
votes
8answers
53k views

How can I monitor hard disk load on linux

Is there a good command line utility to monitor hard disk load on linux? Something like top but then monitoring disk activity i.s.o. cpu usage. More specifically, I suspect that for some (heavy load) ...
7
votes
4answers
9k views

Postgres error message: FATAL: Ident authentication failed for user “…”

Say you're seeing this message: FATAL: Ident authentication failed for user "..." What are the causes of this error message?
0
votes
2answers
3k views

service httpd restart failure on aws amazon linux ami

Thanks for your help. I recently did the following: Ran sudo yum update on my ec2 instance running the Amazon Linux ami I then added a virtual host to my vhost.conf for a subdomain. While the server ...
0
votes
0answers
13 views

Permissions of files and subfolders in /var/www/html (Ubuntu 14.10 + Apache2)

I have some questions about permissions and ownerships of folders and files in Ubuntu Server 14.10 + Apache2. Is it correct that /var/www/html is owned by root:root by default? As far as I read, it ...
0
votes
1answer
24 views

Supermicro super server RAID warning

Hey guys sorry in advance for the noobish question. Our company just received a brand new 6017R-WRF Supermicro superserver. I have been tasked with getting this bad boy setup. I am a software dev ...
2
votes
2answers
30 views

Is an ECC ram enabled GPU necessary for a server, or will a normal gpu work fine in a server?

Is it a requirement for a server to use ECC ram on a GPU while the normal CPU ram is ECC? Im thinking that instead of using a Quadro k6000 or AMD Firepro, we could use a GTX 980 or AMD r9 290...if ...
2
votes
1answer
1k views

failed to fetch volume file

When my client try to connect gluster server it gives below error: [glusterfsd-mgmt.c:1627:mgmt_getspec_cbk] 0-mgmt: failed to fetch volume file (key:gluster_vol_0) My client is an Amazon Linux ...
1
vote
1answer
25 views

Need advices on iptables

Helly guys ! :-) . I need a (several?) advice(s) from you about my iptables setup. I'm pretty new to iptables, and this is the first time I configure a server with iptables ONLY as a firewall (we ...
2
votes
2answers
12 views

How do I request a certificate from CEP / CES on a Microsoft CA on OSX or Linux?

This article describes how to request a certificate from AD CS (Active Directory Certificate Services) from a non-domain joined windows computer. I would think the same principals apply to non ...
0
votes
0answers
10 views

Mapping right CTRL key to ENTER function

I am using Putty to connect to a Linux server. I am a mainframe person so I really want to map my right CTRL key to ENTER and then map the ENTER key to the NEWLINE function to mirror how the keys ...
0
votes
2answers
323 views

VIP not dropping from backup keepalived

I may not be understanding how this is supposed to work, but I can't figure out why the BACKUP system with this basic vrrp_instance is transitioning to master right away and never seems to honor the ...
-2
votes
0answers
12 views

server performance affected due to node and npm

I have a server that is very slow compared to the memory it has. https://gist.github.com/shantanuo/ac80790c67cc1cca76e9 I can see several node and npm processes. Are they affecting the performance?
0
votes
0answers
18 views

Run server on home PC [on hold]

I am newbie. I have static IP address. Is it possible to serve my web site on my local PC.While registering domain I have to specify NS server. I don't clearly understand what is the purpose of this. ...
1
vote
1answer
861 views

Create a general character devices pair

I'd like to create a character device which has the same properties as a standard pseudo-terminal, but that can be named in a specific name. Basically I'd like to have /dev/pts/my-unique-name instead ...
-1
votes
1answer
9 views

Can we run thin client to connect to Linux (Suse or Ubuntu)

Not sure where to ask such questions, so guide me on that! I am looking to have several thin clients to use same server (system), the work involved is mostly office and browsing related works - that ...
5
votes
2answers
2k views

Limiting interface bandwidth with tc under Linux

I have a linux router which has a 10GBe interface on the outside and bonded Gigabit ethernet interfaces on the inside. We have currently budget for 2GBit/s. If we exceed that rate by more than 5% ...
0
votes
1answer
26 views

Linux centric backup solution for NTFS target

I've got to backup data (around 100GB) on a linux system on a daily basis. I need daily incremental and regular full backups on an 2TB USB drive that is NTFS formatted (no way to change that). If I ...
0
votes
1answer
1k views

using tcpdump to display XML API requests without headers or ack packets

I need assistance, I am trying to use tcpdump in order to capture API requests and responses between two servers, so far I have the following command: tcpdump -iany -tpnAXs0 host xxx.xxx.xxx.xxx and ...
1
vote
0answers
21 views

Unable to boot into software RAID1 after disk failure

Today after restarting my data server I was unable to boot because one of the drives wasn't being recognized any more, it is still spinning when I connect it and not making many weird noises except ...
-2
votes
0answers
18 views

remove lines from a file based on whether corrersponde to a list of names [on hold]

could help to create a perl script to delete a line file based on a specific name , eg if I want to delete me from node 1 and node 4 and its contents until you find another based on one ready names eg ...
1
vote
1answer
47 views

firewalld vs iptables - when to use which

TL;DR On new CentOS server installs should I be using firewalld or just disable that and go back to using /etc/sysconfig/iptables ? firewalld and iptables serve similar purposes. Both do packet ...
0
votes
1answer
35 views

Why is linux not listing the IP I want?

I have a linux based cluster (using openMosix). The machine intended to be used as a server has 2 network cards. Cluster is working, and all machines ping to each other inside the cluster (internal ...
2
votes
1answer
840 views

keepalived: 2nd VRRP_Script never seems to run

I'm trying to implement keepalived on 3 mongodb boxes, the idea is that if mongod on one of the boxes goes down or we need to move the primary node to another system for some reason our application ...
2
votes
1answer
1k views

How to achieve multiple NFS/TCP connections to the same server?

I'm trying to maximize the NFS/TCP bandwidth between a Linux client and a single NFS server over a 10Gbps link. Although each NFS mount has its own device (major/minor), everything comes down to a ...
0
votes
2answers
51 views

Can a Linux Kernel be shared between two operating systems?

Quite simple question. I am working on a project to have multiple operating systems (all linux) on the same machine using btrfs subvolumes so that the user can boot to the environment they are ...
0
votes
1answer
379 views

Nothing is written in php5-fpm.log

I have two servers which is Ubuntu 12.04 and Ubuntu 14.04. When I use Ubuntu 14.04 in my new server and enabled the php-fpm log file found under /etc/php5/fpm/php-fpm.conf that reads as follows: ...
0
votes
0answers
26 views

Kerberos, Active Directory, and Linux/Unix Servers

I have done some research on the topic, but I can't quite find a straight answer to my question. Please tell me if my understanding is correct. Kerberos can be used as the bridge between a ...
1
vote
3answers
4k views

Possible to mount an ext4 partition image via FUSE?

I'm attempting to mount an ext4 partition image in userspace. (no sudo, no special config/permissions modification to /dev/loop0 or /etc/fstab etc). So I'm hoping FUSE will come to the rescue. ...
36
votes
6answers
21k views

How to add a security group to a running EC2 Instance?

I have an Amazon EC2 instance running and I will like to add another security group to that instance and then remove the current security group from that instance. Is this possible?
0
votes
1answer
896 views

NFS daemon not starting up with error message “Kernel does not have pseudo root support”

My nfs daemon is not starting up anymore. I see the following entries in the syslog: Sep 26 18:21:10 VOXWEBPRODDHNCGN001 mountd[3401]: Kernel does not have pseudo root support. Sep 26 18:21:10 ...
0
votes
1answer
933 views

Gre Tunnel Cisco Linux traffic forwarding

I setup a gre tunnel a cisco router and a Linux machine, the tunnel interface in the Linux box named pic. Well i have to forward traffic coming from cisco through the Linux box. the rules i've set in ...
1
vote
1answer
29 views

Suddenly error='Cannot allocate memory' (errno=12) [on hold]

So this morning I noticed my website is down, went on my server and saw that the webserver has been stopped. When I try to start it again I get this error start -Dhttp.port=80 ...
1
vote
3answers
2k views

Disable user_deny.db in Cyrus/imapd

We have a cyrus 2.4.12 on Debian, we use packages, rather than building each software ourselves. I am getting the this "log" constantly, a lot of, various users, and 8-10 times per user request: ...
5
votes
1answer
87 views

Postfix stops picking up mails at night

Our postfix system stops sending mails at night. Every night at 2am it stops picking up mails. The server is a monitoring server, which sends a lot of mails per day. /bin/mail drops the mails in the ...
4
votes
3answers
1k views

Extend RAID 1 (HP SmartArray P410i) running Linux

I took over a fairly simple server setup with the following RAID 1 config running Ubuntu 11.10 (Kernel 3.0.0-12-server x86_64): => ctrl all show config Smart Array P410i in Slot 0 (Embedded) ...
0
votes
1answer
2k views

vsftpd: refusing to run with writable root inside chroot

I want to setup a anonymous only ftp server (able to upload files). Here is my config file: listen=YES anonymous_enable=YES anon_root=/var/www/ftp local_enable=YES write_enable=YESr. ...
18
votes
6answers
8k views

Can't log in via SSH to any accounts set to use /bin/bash as a default shell

I'm trying to install bash as the default shell on a ARM Linux running on an embedded device (Synology DS212+ NAS). But there's something really wrong, and I can't figure out what it is. Symptoms: ...
0
votes
0answers
18 views

Plain (remote) Linux desktop on my VNC Viewer? [migrated]

So for some reason my VNC Viewer is not showing any desktop icons on the remote Linux. I remember it first happened after I clicked on the button "Quit this session". I am using putty as a terminal ...
0
votes
1answer
992 views

Redirect some specific traffic to a different gateway

I have two gateways with different ISP, one of them defined as default for the LAN user and the other ISP used as the default for the Servers and VPN traffic. This is done using regular routing tables ...
2
votes
1answer
927 views

Linux Client Active Directory Authentication stops working when failover

I have an issue with Linux clients trying to AD authentication by targeting a DNS name (corp.example.com). I have 2 Domain Controller servers DC1(10.0.0.3/24), DC2(10.1.0.3/24) both domain controllers ...
-1
votes
1answer
25 views

How to change volume mount

I have two volumes in my EC2 ubuntu instance: NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT xvdb 202:16 0 40G 0 disk /mnt xvda1 202:1 0 400G 0 disk / I want the 400GB one to be the main ...
0
votes
0answers
21 views

Server making outbound dns requests [duplicate]

I have a cloud server with Rackspace and they have blocked DNS because of "excessive queries". I can find the info below when running ps, but I can not seem to locate where the file is that is making ...
-3
votes
1answer
34 views

Does swap on 32-bit OS with 4 GB make sense? [on hold]

Does having swap space makes sense if I have a 32 bit OS (Linux) and 4 GB RAM already? As it would have to be addressable with a 32 bit address, which are already all "used up" by the RAM, would ...
-1
votes
1answer
13 views

SELINUX blocking php-fpm and nginx working together?

I'm having some issues with SELINUX. When trying to visit my website I get 403 forbidden from nginx and the server pops up with an error and says to use grep NGINX /var/log/audit/audit.log | ...
1
vote
1answer
22 views

Why are ls and locate returning different file names?

We have recently deployed a commit that took a file called MyfileController.php and changed it to MyFileController.php If I navigate to the file's directory and call ls or nano MyFileController.php ...
4
votes
1answer
74 views

serviceable ext3 partition ruined by fsck

I've got several systems with an ext3 lv / that work just fine until fsck'd — then they are unrecoverably corrupted. What hope do I have of repairing these systems, and, separately, what went wrong? ...
3
votes
4answers
2k views

Cron to run every 2nd wednesday?

I need to find a way to cron a job so that it runs every second wednesday of the month. Is this possible?
0
votes
1answer
18 views

How to automate input for a repetitive script! Expect in Bash?

I am a junior sys admin. Reason I'm asking this question is because we don't have a senior sys-admin here who is proficient with scripting. Senior guys are at the head office and too busy for ...
0
votes
2answers
1k views

Find CCISS version

I'm currently running Ubuntu 10.10, and would like to just find out what version of HP's CCISS RAID array driver I'm running. I've looked around hpacucli and couldn't find anything; can anyone point ...