Questions tagged [linux]
Linux is the generic term for a UNIX-like open source operating system based on the Linux kernel.
38,560
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iptraf shows excessively high traffic, switch says almost no traffic
I have a weird problem with traffic here. My server is connected via 100mbit to a netgear switch. Now sometimes when I look at the traffic on the server using iptraf it reports in excess of ...
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top command occupied high cpu usage
My system is SUSE 10 and I observe that top occupies 57% CPU usage when I use it.
I don't have too many processes:
ps -eLf | wc -l
106
Here are top's stats:
cat /proc/2913/stat
2913 (top) R 2879 ...
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expect + how to identify if expect break because time out?
The target of the following simple expect script is to get the hostname name on the remote machine
Sometimes expect script fail to perform ssh to $IP_ADDRESS ( because remote machine not active , etc ...
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Pro Linux Administration Guide / Book [closed]
We run a cluster of 45 linux machines with a lot of different stuff running (nginx, Varnish, Apache, MySQL, memcache etc) and load getting balanced on different machines. We do around 3000 requests ...
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Apache on linux with two real certificates (.com and .co.uk)
I can only configure one. when I try to configure the other I get httpd error with bad syntax.
any one know how to configure 2 certificates in apache?
this is what I have:
# ssl
LoadModule ...
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Secure tunnelling networks with linux
I would like to build some kind of "virtual network" between two companies located in two different countries.
This way, an LAN machine (192.168.x.x) located in the A company could ping directly a LAN ...
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VMware vCenter Converter - P2V Linux Machine
I'm trying to do P2V with a Debian powered-on source. Everything works perfectly up until the point of selecting destination.
It states that the destination type is VMware Infrastructure virtual ...
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How can I find out what user from a specified IP is doing with my server?
Yesterday night around 2:00, I occasionally try out a snippet:
netstat -ntu | tail -n +3|awk '{ print $5}' | cut -d : -f 1 | sort | uniq -c| sort -n -r | head -n 5
Then it turns out one IP is having ...
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setting the linux capability CAP_SYS_RESOURCE
I'm trying grant a user the CAP_SYS_RESOURCE linux capability on an Ubuntu 10.04 machine. I need this so that a process run by this user can write to /proc/self/oom_adj (yes I realize this this is ...
user113656
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ec2 coppied AMI carries over old.ppk key, need to change keys
i copied a private AMI (lamp) over from a different account and created a new instance on ec2. the new instance has a new.pem key associated with it and i can see the title from AWS Management Console:...
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What equipment/software is needed for setting up a LAN-based webserver for learning the ropes locally? [closed]
I'm a complete linux/networking beginner. What equipment/software will be needed to do this? Basically I want to set up a server computer and be able to connect to it locally with my desktop, and ...
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Getting OpenVPN to fully connect two networks
I have a client (which is also a gateway for a 192.168.203.0/24 network) that is trying to connect to a remote server (that is a gateway for a 192.168.150.0/24 network) and make a fully bridge between ...
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How to correctly set up iWARP? Preferably on loopback
iWARP is a protocol for doing remote direct memory access (RDMA) on top of TCP/IP, so that it can work with Ethernet and other network types as opposed to Infiniband. It works with many of the ...
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How to configure Samba to allow root user for full control to the particular share?
$(subj), it appears to be what root user is denied by default for all of the shares.
I'm trying to reproduce Windows administrative share.
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Fail2Ban - how to prevent my ISP IP dynamic get banned?
I have just installed Fail2Ban.
I want to add my ISP IP to my ignore list but my IP is dynamic.
In the jail.conf file, I have like this:
[DEFAULT]
# "ignoreip" can be an IP address, a CIDR mask or ...
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How can I see if mysql starts without errors?
Today I have changed mysql config file and restarted mysql with:
service mysql restart
And saw the following:
Stopping mysql database server: mysqld.
Starting mysql database server: mysqld.
...
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Syntax error when starting Rails server, RVM could be the issue?
I am getting the following error when trying to start my Rails application in production for the first time:
/var/www/railsapp/config/initializers/session_store.rb:3: syntax error, unexpected ':', ...
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Linux File Permission 0070 - Group RWX
A friend of mine set permissions on a file that he owns to 0070. He's in the group. Basically, he wants the group to have rwx, but not the file owner. When he tries to cat or vi the file, he gets ...
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linux yum through a socks v5 proxy
I can't use yum because port 80,443 are being blocked by a firewall.
I setup a ssh proxy tunnel (socks v5), it works fine.
I've tried to find how to use yum with a socks v5, but looks like it only ...
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squid reply_body_max_size not working
I have been tasked to limit bandwidth consumption. I have setup squid as a transparent proxy and am blocking various content types i.e video, x-flv... The content type acl's seems to work fine. I have ...
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zabbix import trigger template
i am importing a zabbix template, the items load successfully
snippet of the xml template:
<triggers>
<trigger>
<description>PING response on Vlan1</...
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Ubuntu Linux - two interfaces, same subnet, different vlan - MAC/ARP issues
I'm attempting to setup a server that needs to have interfaces on the same IP subnet, but different VLANs:
eth1.102 Link encap:Ethernet HWaddr 00:50:56:b1:00:0f
inet addr:10.1.1.6 ...
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How to connect to virtualbox's host-only network from outside using openvpn
What i want to do is:
have an internal network for guest systems / be able to make connections between guests inside network
have internet connection for guests (to download updates)
be able to ...
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2
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xorg.conf missing in Debian
I'm attempting to configure X on a headless server. I've installed the xorg, tightvnc, and fluxbox but /etc/X11/xorg.conf is missing.
I've run xorg -configure and it gives fails giving the following ...
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How do I block an email sender using SSH
Having a bit of a nightmare with our Linux server.
Somehack is using our server for spaming. I sanitaized all inputs, have captcha image, change passwords, etc. but still.
Somehow they keep on doing ...
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Creating backups securely
So I have the following setup:
Server A (webserver)
Server B (Xen Dom0 - with logical volumes)
Server C (backup server)
I want to create backups from server B to server C all automatically and ...
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Cannot login after chmod o -rwx
I have typed a recursive chmod o-rwx command from root in a linux via ssh. After that I can not login as root anymore. It is a huge problem now. Can I do anything to do to resolve this? I can only ...
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How do I pass credential file to mount.cifs?
I'm maintaining a heterogeneous network of mac and linux so I decided to create a little perl script to unify mounting strategies across machines.
The current implementation in linux is in /etc/fstab ...
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How do I limit concurrent session on a per user basis for ssh?
I am trying to prevent my ssh users from having more than one session open at once, my system is Ubuntu 11.10.
I thought the setting was in /etc/security/limits.conf where I set the following:
...
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How do I upgrade php on openSuse?
I'm currently running openSuse 12.1 with php 5.3.8 and would like to upgrade to 5.4. How may I do this? I'm used to just installing software packages with yast.
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Starting a screen while su'ed into another user from an alias isn't working
minecraft@283823:~$ script /dev/null ; screen -t minecraft
Script started, file is /dev/null
minecraft@283823:~$ exit
Script done, file is /dev/null
Cannot open your terminal '/dev/pts/0' - please ...
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Tomcat 4 Upgrade
I'm looking to migrate a custom web-based application written for Tomcat 4 to a new CentOS system. The old Debian 3.1 system is starting to have issues with it's storage. I'm well versed in Linux ...
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Linux FTP alternative for single application
I have a dedicated ubuntu 10.4 LTS x64 server running with:
nginx webserver
Php
mysql community
mongodb
The webserver will be running a single web application, I don't share the server with anyone I ...
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what is DDODBC.DAT
The file /var/local/odbc/DDODBC.DAT is being created/accessed on some (not all) servers when the database is accessed via Perl dbi:ODBC.
I did a full crawl through /var/local/odbc on a server that ...
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Putty fatal error after I enter CLI?
I am new to the whole virtual linux world. And this particular problem is strange and after a day of googling I find myself again on serverfault so thanks for your time!
I created a linux ec2 ...
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How to give a user account root privileges in Fedora 14?
I want to give my user account root access rights permanently, how can i do that? (i don't want to login using the root account). thx!
user1157977
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BIND DNS SERVER in my Production environment [closed]
I would like to start working with a local DNS server in my production.
right now instead of working with DNS I'm working with IP Addresses.
I would like to know what is the effect of working with ...
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Linux du and rsync 100% disk utilization
Whenever I run du -sh or rsync I get my disk utilisation at 100%. This causes mysql slow queries to appear, which usually causes my site going down.
Any tips or tricks running these to commands ...
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How to change Firebird default port in linux?
I'm trying to change firebird (2.5.1) default port from 3050 to 3051 on OpenSuse 11.4
So I installed firebird (install.sh) and in /opt/firebird/firebird.conf I uncommented and changed ...
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yum: how to see processes affected by an upgrade?
While zypper offers a "ps" option to show processes currently using deleted/upgraded files, yum appears to lack such an option...
How do you know with yum if there are processes needing to be ...
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Why is my process dying mysteriously?
I have read quite a lot of pages about the OOMKiller, including http://www.linuxatemyram.com/ , but I don't quite get still why a backup script I run would be killed if I look at my output of 'free -m'...
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How to add a user without knowing the encrypted form of the password?
I use the following command to create a user in a linux machine:
useradd -d /home/dummy -g idiots -m -p 12345689 dummy
The user is created and the home directory as well.
The problem is that I ...
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HTTPS but don't share certficate, manual installation required
Is it possible, from a server level (Apache), to enable HTTPS but that we don't share the certificate via the browser, the certificate must be installed prior to accessing HTTPS via the browser?
Best ...
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Different results from GnuPG and OpenSSL when using AES256 encryption
Text: apple
Pass: password
openssl aes-256-cbc -e -a -in apple.txt
Output: U2FsdGVkX1/sqDrVkgk/7dKiCfLW+1/bgvRT/YAopJQ=
gpg -c --cipher-algo AES256 apple.txt
Output: ...
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Broken BIOS detected, complain to your hardware vendor. WTF?
This is what I found in dmesg on my new Fedora 16 instalation on new HP ProLiant DL320 G6
[ 0.130963] Performance Events: PEBS fmt1+, Westmere events, Broken BIOS detected, complain to your ...
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SuSE Enterprise Linux 10 reports "write error: disk full?" even though there are 13TB available
So, I recently added some disk to a system and everything seemed to be peachy, the extending of the LVM went fine and so did the filesystem resize. However, when a user logs on to the system and tries ...
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Missing LV in VG in LVM partition on Ubuntu
After a power failure, Ubuntu 10.04 Server hard drive is no longer bootable. I tried using boot-repair but it couldn't locate an operating system.
I ran gdisk to verify where the lvm partition was ...
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3
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Faster MySQL DB pull from remote machine into local machine
I use this command to pull some remote db to local db:
$ ssh remote.com "mysqldump remotedb | gzip" | gzip -d | mysql localdb
I see this runs a bunch of individual commands on the database. Is there ...
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Tunneling mysql through a second server not visible to the outside
This is the setup:
I have 1 debian server deep within the network running a mysql server.
I have a second debian server who is exclusively allowed to access the mysql server of the first server.
I ...
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2
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How to change Tomcat user in red hat Linux
I installed my Tomcat as root user in Linux for testing purpose and It's working fine. I would like to change the user for security purpose, So that owner of log files and other files will be created ...
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