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• Increase text size in Ubuntu due to having large resolution/monitors

  - by Sridhar Ratnakumar

  I have 24" dual monitors with 1920x1080 resolution on both of them. Consequently the text appears so small. I use the following text-intensive applications frequently: Web browser (Google Chrome) IDE (Komodo) Terminal (Gnome Terminal) Email (Thunderbird) I can configure text size on IDE, Terminal and Email. But for Chrome, it is not a good idea to set proportional font size because often one wants to see the entire (not just proportional fonts) site to be zoomed. So I am asking: Is it possible to increase DPI in Ubuntu (much like on Windows) so as to increase the text size across all apps? OR Is it possible to set permanent 'zoom' in Google Chrome, using a third-party extension maybe?

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• OpenVZ vs Xen, how much difference in performance?

  - by Aleksandr Levchuk

  There is a Xen vs. KVM in performance question on ServerFault. What will be the performance difference if the choice is between Xen and OpenVZ? How is it best to measure? Some may say "you're comparing apples and oranges" but I have to choose one of the two and it needs to be wise choice. Performance is most important to us. We may switching to Xen from OpenVZ because Xen is more ubiquitous but only if performance difference is not significant. In January 2011 I'm thinking of doing a head to head performance comparison - here is my project proposal to our Bioinformatics facility director.

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• How to migrate a running KVM (with full disk copy) to another node?

  - by klipz

  I'm doing tests on KVM, and I'd like to see if I can make a hot migration, I mean the virtual machine won't stop running during the migration (but a few seconds of freeze is ok). I use a small cluster for my test : kvm1, kvm2, and kvmnfs. kvm1 and kvm2 runs the virtual machines kvmnfs is a NFS server, and it's mounted on /KVM on both kvm1 and kvm2 To migrate a VM (only RAM in fact) from kvm1 to kvm2, I run the same kvm command on kvm2 (with -incoming tcp:0:4444) that on kvm1, then I use "migrate -d tcp:kvm2:4444" : It works great, since the VM file is common to both machines. Now, I wan't to make a full migration (RAM + disk) of a local VM file (no more NFS) of kvm1 to kvm2. I tried to create an empty file, with touch, on kvm2 and use the same kvm command line + the "-incoming ..."). Then on kvm1 I use "migrate -d tcp:kvm2:4444" : It copies everything, then... the VM fails (any I/O disk gives an I/O error) ! And my VM file on kvm2, the one I created with touch, as still a size of 0 bytes. What am I doing wrong ? What is the exact command to use on kvm2 ? And what is the command to launch, in the monitoring mode, on kvm1 ?

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• samba 3.5 "force user" doesn't seem to be sticking

  - by myCubeIsMyCell

  After installing a new OS with newer version of samba, I'm having trouble accessing my shares. I can browse to the specific share, but only to the top level. As best I can tell from the logs, it seems the "force user" in the samba config isn't sticking beyond the initial connection. Details below. I installed a new version of CentOS on my storage server. My old CentOS (4?)install had samba version 3.0.33, new CentOS is using 3.5.10. No domain/AD involved ... just home workgroup. no real security... just some shares hidden & some defined as read-only. here's my config: [global] workgroup = WORKGROUP server string = Samba Server Version %v netbios name = luna security = share # logs split per machine log file = /var/log/samba/log.%m log level = 2 # max 50KB per log file, then rotate max log size = 50 winbind use default domain = Yes [strge] comment = please path = /storage browseable = yes read only = no force user = windowsguest force group = users guest ok = yes So... the problem I'm running into is that the 'force user' only seems to hold for the initial connection & I see all the top level folders fine. When I drill into a folder I get access denied - which appears to be due to my windows user info being sent (trys to authenticate xuser - a non-existant user to samba, so maps to nobody & fails). Here's the smb error msg: [2012/11/29 14:30:27.326195, 2] auth/auth.c:314(check_ntlm_password) check_ntlm_password: Authentication for user [xuser] -> [xuser] FAILED with error NT_STATUS_NO_SUCH_USER [2012/11/29 14:30:27.326251, 2] auth/auth.c:314(check_ntlm_password) check_ntlm_password: Authentication for user [nobody] -> [nobody] FAILED with error NT_STATUS_NO_SUCH_USER Most of the top level directories are 755, some 777. Either way, can not access them. If I do a chown -R windowsguest.users ... no change... but if I do a chmod -R to 777 or 755 they become browsable... but still can't create files (even for 777 ones). Not sure what role it plays if any... but had to recreate the user windowsguest under the new os install, uid & gid match old user. Seems the main issue as far as I can tell is that samba isn't maintaining the 'force user' - but I could be wildly off base. Client OS is win7 pro x64. Thanks for any suggestions or advice!

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• Installing sqlite gem fails on AWS Linux instance with sqlite-devel libraries installed

  - by Scott

  Hi, I'm running an instance built off ami-595a0a1c. I am trying to install the sqlite3 (or sqlite) gem and it's failing with the below error: $ sudo gem install sqlite3 Building native extensions. This could take a while... ERROR: Error installing sqlite3: ERROR: Failed to build gem native extension. /usr/bin/ruby extconf.rb checking for sqlite3.h... no sqlite3.h is missing. Try 'port install sqlite3 +universal' or 'yum install sqlite3-devel' and check your shared library search path (the location where your sqlite3 shared library is located). extconf.rb failed * Could not create Makefile due to some reason, probably lack of necessary libraries and/or headers. Check the mkmf.log file for more details. You may need configuration options. Provided configuration options: --with-opt-dir --without-opt-dir --with-opt-include --without-opt-include=${opt-dir}/include --with-opt-lib --without-opt-lib=${opt-dir}/lib --with-make-prog --without-make-prog --srcdir=. --curdir --ruby=/usr/bin/ruby --with-sqlite3-dir --without-sqlite3-dir --with-sqlite3-include --without-sqlite3-include=${sqlite3-dir}/include --with-sqlite3-lib --without-sqlite3-lib=${sqlite3-dir}/lib Gem files will remain installed in /usr/lib64/ruby/gems/1.8/gems/sqlite3-1.3.3 for inspection. Results logged to /usr/lib64/ruby/gems/1.8/gems/sqlite3-1.3.3/ext/sqlite3/gem_make.out Typically, this just means you need to install the development libraries and everything is cool. However, I have installed the sqlite-devel packages and still no dice. Since this is the Amazon Linux instance, I'd rather not add more repositories than the ones Amazon provides if possible. What can i do to get this thing to compile? Thanks for any insight! From a brand new instance, here's what I've done: $ sudo yum install rubygems ruby-devel $ sudo gem update --system $ sudo gem install rails $ rails new app $ cd app $ rails server Could not find gem 'sqlite3 (= 0)' in any of the gem sources listed in your Gemfile. $ sudo yum install sqlite-devel $ sudo gem install sqlite (or sqlite3 -- same result) See breakage above

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• Backup Xen domU machines while running.

  - by Jonathan Hawkes

  The host machine is running CentOS 5.3 and using LVM to create Logical Volumes (LVs) and to allow live snapshots to be taken of those LVs. My thought was to store all of the image files for the Xen underpriviledged domains (domU) in a single LV and periodically take a snapshot of that LV and copy the disk images out of the snapshot in order to make a live backup of these systems. Is this doable? Is there a better way? Thanks!

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• OpenSSH does not accept public key?

  - by Bob

  I've been trying to solve this for a while, but I'm admittedly quite stumped. I just started up a new server and was setting up OpenSSH to use key-based SSH logins, but I've run into quite a dilemma. All the guides are relatively similar, and I was following them closely (despite having done this once before). I triple checked my work to see if I would notice some obvious screw up - but nothing is apparent. As far as I can tell, I haven't done anything wrong (and I've checked very closely). If it's any help, on my end I'm using Cygwin and the server is running Ubuntu 12.04.1 LTS. Anyways, here is the output (I've removed/censored some parts for privacy (primarily anything with my name, website, or its IP address), but I can assure you that nothing is wrong there): $ ssh user@host -v OpenSSH_5.9p1, OpenSSL 0.9.8r 8 Feb 2011 debug1: Connecting to host [ipaddress] port 22. debug1: Connection established. debug1: identity file /home/user/.ssh/id_rsa type 1 debug1: identity file /home/user/.ssh/id_rsa-cert type -1 debug1: identity file /home/user/.ssh/id_dsa type -1 debug1: identity file /home/user/.ssh/id_dsa-cert type -1 debug1: identity file /home/user/.ssh/id_ecdsa type -1 debug1: identity file /home/user/.ssh/id_ecdsa-cert type -1 debug1: Remote protocol version 2.0, remote software version OpenSSH_5.9p1 Debian-5ubuntu1 debug1: match: OpenSSH_5.9p1 Debian-5ubuntu1 pat OpenSSH* debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_5.9 debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug1: kex: server->client aes128-ctr hmac-md5 none debug1: kex: client->server aes128-ctr hmac-md5 none debug1: sending SSH2_MSG_KEX_ECDH_INIT debug1: expecting SSH2_MSG_KEX_ECDH_REPLY debug1: Server host key: ECDSA 24:68:c3:d8:13:f8:61:94:f2:95:34:d1:e2:6d:e7:d7 debug1: Host 'host' is known and matches the ECDSA host key. debug1: Found key in /home/user/.ssh/known_hosts:2 debug1: ssh_ecdsa_verify: signature correct debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug1: SSH2_MSG_NEWKEYS received debug1: Roaming not allowed by server debug1: SSH2_MSG_SERVICE_REQUEST sent debug1: SSH2_MSG_SERVICE_ACCEPT received debug1: Authentications that can continue: publickey debug1: Next authentication method: publickey debug1: Offering RSA public key: /home/user/.ssh/id_rsa debug1: Authentications that can continue: publickey debug1: Trying private key: /home/user/.ssh/id_dsa debug1: Trying private key: /home/user/.ssh/id_ecdsa debug1: No more authentication methods to try. Permission denied (publickey). What can I do to resolve my problem?

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• How to identify heavy write to disk?

  - by Darth

  I have this problem with server running CakePHP application. The server is insanely slow, I first thought that it's application problem, but then I found constant 5-6MB/s write to disk. What is the easiest way to find cause of such a heavy write? The server is running Gentoo.

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• Is using Capistrano for user maintenance tasks on university lab feasible?

  - by danielkza

  I've been looking around for tools to replace some legacy scripts for creating and maintaining accounts in a university computer lab ecosystem consisting of things like: LDAP and Kerberos for authentication User home storage and web pages Entries on an SQL database Printing quotas Mailing lists, etc. I'd also like to automate machine and VM membership for Kerberos and Puppet if possiible. I've found Capistrano, and while the basic principle of running tasks on remote hosts through SSH seems to fit, and the DSL in Ruby looks quite nice, I've found most documentation is related to application deployment, not generic tasks. I'm also not aware of any good way to parameterize tasks so I can pass on the user information for creation. Is something about Capistrano I am missing, or is it not the correct tool for this job? Are there any more userful alternatives?

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• KVM network bridge with two NICs

  - by Eil

  Greetings, I'm trying to set up bridged networking with KVM and am getting nowhere. There are docs and tutorials on the subject, but they all seem to conflict or don't provide enough info. I was wondering if someone can give me a high-level overview of how to get this working. I can probably work out the details myself (configuring the interfaces, adding routes, etc), I just need help on the big picture: how everything is interconnected. I have a RHEL5 server with KVM installed and running. It has two physical NICs, eth0 and eth1 in the same VLAN. I would like to use eth1 for all traffic between the guests and the rest of the network and reserve eth0 for host management, guest migrations, etc if possible. I'm not picky about which one gets the default route, although it would be nice if we could make it eth0. All of the guests will have static IPs. I would prefer that when a new guest is added, the networking configuration only needs to be set from within the guest itself. Basically, I want this: eth0: all host traffic eth1: all guest traffic Open to any other suggestions if this isn't possible or will be kludgy/difficult. Pointers to existing documentation might not be helpful since I've already been though just about everything out there. Thanks for any help.

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• installing rpm packages on ubuntu

  - by Hulk

  In ubuntu i have downloaded flash rpm,how to install it.i am new to ubuntu and i have tried the following alien -k flash-plugin-10.0.45.2-release.i386.rpm alien -i flash-plugin-10.0.45.2-release.i386.rpm rpm -i flash-plugin-10.0.45.2-release.i386.rpm //this works in rhel versions The above doesn't seem to work.. Thanks..

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• Creating diff from a tar

  - by Hulk

  There is a tar file which was created few days before, this tar file was created on the /files directory. And now /files directory has new files uploaded in it. My question is how to create another files with only the new files uploaded. Thanks..

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• Hostname changed without syslog restart

  - by Arpit

  Hi, I wish to know is there any way I can changed hostname without restarting the syslog As I want the changed hostname to be reflected in the syslog messages. Thanks Arpit

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• Can you have more than one ~/.ssh/config file?

  - by DrewVS

  We have a bastion server that we use to connect to multiple hosts, and our .ssh/config has grown to over a thousand lines (we have hundreds of hosts that we connect to). This is beginning to get a little unwieldy and I'd like to know if there is a way to break the .ssh/config file up into multiple files. Ideally, we'd specify somewhere that other files would be treated as an .ssh/config file, possibly like: ~/.ssh/config ~/.ssh/config_1 ~/.ssh/config_2 ~/.ssh/config_3 ... I have read the documentation on ssh/config, and I don't see that this is possible. But maybe someone else has had a similar issue and has found a solution.

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• Open a file with eclipse via terminal and focus eclipse window

  - by Rui Carneiro

  I am a webdeveloper and my current working tools are: Terminal (ssh, tailing logs, grep, git, etc) Eclipse (PDT, Javascript, etc) Firefox (Developer Toolbar + Firebug) The problem is that I hate using the eclipse navigation tree. For me it is a lot easier to go to the Terminal and do something like this: $ eclipse /var/www/myproject/long/path/lib/Driver/Sql.php The annoying part is that the eclipse window is not focused after this command. I have to manually click on the eclipse window (using mouse... :@ grrr) Anyway to force eclipse to be focused?

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• OpenAFS on Fedora/CentOS

  - by Michael Pliskin

  I am trying to see if OpenAFS fits my needs as a distributed filesystem and is a bit stuck. There are docs but they're all quite hard to understand, so asking for some expert advice here. My questions: which version to install? I need windows client support so I need 1.5 - right? But it is not stable.. Or is it? And don't see any pre-built rpms for it, so compiling from sources? tried to compile and it worked but it created a non-"mp" kernel module while my kernel needs an mp one - how to workaround that? do I really need a new fresh partition to start with or I can re-use an existing one and just make it available via afp? any nice HOWTOs around?

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• Exim backscatter

  - by asrijaal

  One of my relays has been listed on backscatter.org, now I'm trying to configure our existing config only to send bounces to local users only. Does anyone knows how I deal with this issue? I've added following rule in my acl_check_rcpt deny senders = : dnslists = ips.backscatterer.org log_message = $sender_host_address listed at $dnslist_domain message = Backscatter: $dnslist_text Would this be enough not get listed again?

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• NIS user not being added to NIS group

  - by Brian

  I have set up a NIS server and several NIS clients. I have a user and a group on the NIS server like so: /etc/passwd: myself:x:5000:5000:,,,:/home/myself:/bin/bash /etc/group: fishy:x:3001:otheruser,etc,myself,moreppl I imported the users and groups on the NIS client by adding +:::::: to /etc/passwd and +::: to /etc/group. I can log in to the NIS client, but when I run groups, fishy is not listed. But getent group fishy shows that it was imported correctly and lists me as a member. And if I do sudo su - myself, then suddenly groups says I am in the group! I also had nscd installed, and the groups worked correctly for a while. It seemed like after being logged in for a while, I would silently be dropped out of the group. If I restarted nscd and logged in again, then the groups worked correctly...for a while. There are no UID or GID conflicts with local users or groups. Update: Contents of /etc/nsswitch.conf: passwd: compat group: compat shadow: compat hosts: files nis dns networks: files protocols: db files services: db files ethers: db files rpc: db files netgroup: nis aliases: nis files

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• nginx + varnish + apache differente IPs in VirtualHost Apache

  - by zeusgod

  Hi, My idea is put NGINX as proxy to redirect to Varnish (cache static content) and then proxy to apache with a lot of VirtualHost in different IPs. My problems is that I would know how can configure Varnish to send access to correct IP, I am going explain: NGINX: Listen in: 10.10.10.10, 20.20.20.20 and 30.30.30.30 on ports: 80 and 443 Proxy redirect to Varnish 10.10.10.10:8080, 20.20.20.20:8080 and 30.30.30.30:8080 Varnish: Port: 8080 - THIS IS THE PROBLEM Proxy content not static to Apache on port 8000 - THIS IS THE OTHER PROBLEM Apache2: Listen in: 10.10.10.10:8000, 20.20.20.20:8000 and 30.30.30.30:8000 Response correct VirtualHost This is the idea. When I try with one IP only, all work correctly, because Varnish is only listen in one IP and port and send to backend in one IP and port too. Could you help me to configure Varnish or there is a best way to configure similar scenario please?

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• How to use HTML markup tags inside Bash script

  - by CONtext

  I have crontab and a simple bash script that sends me emails every often containing PHP, NGINX, MYSQL errors from their log files. This is a simplified example. #/home/user/status.sh [email protected] PHP_ERROR=`tail -5 /var/log/php-fpm/error.log` NGINX_ERROR=`tail -5 /var/log/nginx/error.log` MYSQL_ERROR=`tail /var/log/mysqld.log` DISK_SPACE=`df -h` echo " Today's, server report:: ================================== DISK_SPACE: $DISK_SPACE --------------------------------- MEMORY_USAGE: $MEMORY_USAGE ----------------------------------- NGINX ERROR: $NGINX_ERROR ----------------------------------- PHP ERRORS: $PHP_ERROR ------------------------------------ MYSQL_ERRORS: $MYSQL_ERROR ------------------------------------- " | mail -s "Server reports" $EMAIL I know this is a very basic usage, but as you can see, I am trying to separate the errors, but not of the html tags including \n are working. So, my question is, is it possible to use HTML tags to format the text, if not .. then what are the alternatives.

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• Files listed by bash but unaccessible

  - by Cerin

  What would cause the following behavior on an Ubuntu 12.04 system? I've SSHed into a machine as the "ubuntu" user. Running ls -lah /data/* shows dozens of non-empty files (e.g. file1.txt, file2.txt, etc), all owned by the "ubuntu" user/group, and with full read/write access. If I try to cat /data/file1.txt, bash gives me the error "cat: /data/file1.txt: No such file or directory" In short, ls is listing files, but in every other way, the files essentially don't exist. I can't cat them or read them in any way. Even giving all the files 777 permission doesn't change anything. This is really bizarre. What's going on here?

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• mdadm auto grow raid

  - by johannes

  I have a raid0/1 on lvm logical volumes. I resized the logical volumes. Now I want to resize the raid to use the complete logical volumes. This can be done with mdadm /dev/md? --grow -z newsize But somehow I can't figure out how to calculate the newsize argument. Is there a way to tell mdadm to grow to the biggest possible size? If not, how do I calculate the biggest possible size of the raid to use for the newsize argument?

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• Why a SIGHUP signal to httpd kills the tomcat process?

  - by Geo

  I have a server with a tomcat process binding to port 80 and a httpd processes binding to port 5000. For some reason every time any process send a SIGHUP signal to httpd process my tomcat process disappears without error or anything. I fixed the issue on the server the following way, added an explicit ServerName directive in the httpd.conf and that fixed the issue. I still don't understand why the SIGHUP to httpd killed the tomcat process. NOTE 1: I replicated the kill signal with the following command: find out what the httpd pid is. cat /etc/httpd/run/httpd.pid 4056 then kill with a sighup signal kill -s SIGHUP 4056 NOTE 2: We troubleshoot the issue and find that logrotate running every morning at 4am was sending a SIGHUP signal to realease the logs to be able to rotate them, thus killing tomcat as well.

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• Backtrack 4 internet problem/vmware tools

  - by Meiko

  Hi i recently installed "Backtrack 4" on my vmware workstation 6.5 and it wont install the vmware tools, and will neither let me drag and drop files into backtrack 4. My network connection says that dhcp is not enabled, but i went over to my reuter and checked and the dhcp was online (using Dir-300 from D-Link)

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• Problem switching to a VT from X

  - by Dane Midas

  Hello, I have trouble switching to a VT from X I only have VT 6 defined in inittab, however once in X, ctrl + alt + F6 does not work. I see no errors of any sort, and my keymapping is correct. How would I determine the source of, and solve this problem?

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