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• NTFS write speed really slow (<15MB/s)

  - by Zulakis

  I got a new Seagate 4TB harddrive formatted with ntfs using parted /dev/sda > mklabel gpt > mkpart pri 1 -1 mkfs.ntfs /dev/sda1 When copying files or testing writespeed with dd, the max writespeed I can get is about 12MB/s. The harddrive should be capable of atleast 100MB/s. top shows high cpu usage for the mount.ntfs process. The system has a AMD dualcore. This is the output of parted /dev/sda unit s print: Model: ATA ST4000DM000-1F21 (scsi) Disk /dev/sda: 7814037168s Sector size (logical/physical): 512B/4096B Partition Table: gpt Number Start End Size File system Name Flags 1 2048s 7814035455s 7814033408s pri The used kernel is 3.5.0-23-generic. The ntfs-3g versions I tried are ntfs-3g 2012.1.15AR.1 (ubuntu 12.04 default) and the newest version ntfs-3g 2013.1.13AR.2. When formatted with ext4 I get good write speeds with about 140MB/s. How can I fix the writespeed?

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• virtualbox and nginx server_name

  - by Ivan

  I'm trying to configure gitlab running in an Ubuntu 12.04 guest with Windows7 host. I can ssh the guest using port-forwarding and access the nginx server using port redirection (8888 in host is 80 in guest, so localhost:8888 in host gets to the nginx server in the guest), but the server_name in nginx configuration file is giving me trouble. What is the correct listen and server_name that nginx would accept? The guest has the NAT interface at 10.0.2.15 and Host-Only interface at 192.168.56.101, static. Thanks!

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• Is a reboot required to refresh permissions after adding a user to a new group?

  - by Michael Prescott

  On ubuntu server, I've noticed more than once now that after adding a user to a group that user doesn't have group permissions until I reboot the system. For example: User 'hudson' needs permission to read directory 'root:shadow /etc/shadow' So I add hudson to the shadow group. hudson still cannot read. So, I 'sudo shutdown -h -r now' and when the system comes up again user hudson can read. Is a reboot required or is there a better way to get permissions applied after adding the user to the group?

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• apache running but site not accessible

  - by Shyam

  Am pretty new to server administration. So I am not able to get to the root of the problem. I am running Apache2 with mod_php on a 1GB Rackspace Cloud Server (Ubuntu 9.10). My site goes down often, and I have to restart apache2 to get the site working. I checked the "error.log" file. There were no signs of any error messages. I even searched for words like [error] / error / warn / [warn] . But no results. The site goes down and even then apache is running. When the site was down, the checked the status /etc/init.d/apache2 status and it gave ** * Apache is running (pid 433). ** Any suggestions where I should look for the problem. Thanks a lot.

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• Ethernet port sleeping on PS3 running linux

  - by Doug

  My lab has a PS3 running Ubuntu Linux 9.04 Server Edition. After a period of a few hours with no use, the Ethernet connection (eth0) seems to go to sleep, causing the connection to be lost. Pinging or trying to SSH into the machine results in no response. The fix I've been using is to access the machine locally and restart it (trying to bring eth0 down then up doesn't seem to correct it). I've tried setting up an hourly cron job that runs on the PS3 and pings another machine just to create network activity, but this doesn't seem to solve the problem either. Update: The solution was to run the above cron job much more frequently: every 10 minutes works.

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• PHPMyAdmin HTTP auth works, but not cookie auth

  - by ssmy

  I'm running PHPMyAdmin version 3.3.2 on Ubuntu 10.04, fully updated. Recently, the authentication for PHPMyAdmin stopped working. It would return the error 1045. However, login on the command line still worked. I switched to HTTP authentication instead of cookie auth, and now it works fine. Any ideas why this could be, or what I could do to make cookie auth work again? (Partly just to know, and partly since it's a bit nicer).

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• changing filesystem format from jfx to ext4 without losing data

  - by A.Rashad

  I have a fresh Lucid Lynx (Ubuntu 10.04) running on a laptop. where I defined the filesystems as: mount point / on ext4 (46 Gb) mount point /home on jfs (63 GB) swap as 3 Gb I left the machine over night to do some task, without AC power supply. next day in the morning I found it on standby, task completed, but filesystem was not reachable. it gave me I/O error it seems that there is a problem with jfs and standby. anyways, to avoid any hassle, I want to move this mount point from jfs format to ext4. can I do this without losing data and without the need to place the data in a temporary location until transformation is done? sorry to mention that, but I recall back in the windows days, we would change a FAT16 to FAT32 or a FAT32 to NTFS without having to lose the data. I hope this is available on Linux.

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• Multiple SSH private keys for the same host

  - by Sencha

  How can I store 2 different private SSH keys for the same host? I have tried 2 entries in /etc/ssh/ssh_config for the same host with the different keys, and I've also tried to put both keys in the same file and referencing it from one hosts setting, however both do not work. More detail: I'm running Ubuntu server (12.04) and I want to connect to GitHub via SSH to download the latest source for my projects. There are multiple projects running on the same server and each project has a GitHub repo with it's own unique deloyment key-pair. So the host is always the same (github.com) but the keys need to be different depending on which repo I'm using. Different /etc/ssh/ssh_config versions I have tried: Host github.com IdentityFile /etc/ssh/my_project_1_github_deploy_key StrictHostKeyChecking no Host github.com IdentityFile /etc/ssh/my_project_2_github_deploy_key StrictHostKeyChecking no and this with both keys in the same file: Host github.com IdentityFile /etc/ssh/my_project_github_deploy_keys StrictHostKeyChecking no I've had no luck with either. Any help would be greatly appreciated!

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• Is It key_buffer or key_buffer_size?

  - by user176890

  I search the internet regarding the correct variable in my.cnf file. Some said that key_buffer_size is depreciated, but some said that key_buffer_size is the correct variable in my.cnf. So, what is really the correct variable here? Is it key_buffer or key_buffer_size? I'm using ubuntu 12.04. And also I have the two key_buffer variable in my.cnf file. This is what I got after installing mysql. The first one is located under this: [mysqld] key_buffer = 16M The other one is located under this: [isamchk] key_buffer = 16M

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• access netatalk share on osx permission issue

  - by Fresheyeball

  I have two users in ubuntu. My first was me and I am the owner of the folder in question. The second is my wife. Netatalk is running and we can both see the folder on the network. However I can access it but she cannot. She gets an error in osx "... you don't have permission to see its contents". I have use chmod 777 on the folder but it made no difference. Any ideas? UPDATE The directory in question is a mounted harddrive at /media/ourPhotos

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• What's a fast way to copy a lot of files from an internal hard-drive to external (USB) storage?

  - by jonathanconway

  I have a large amount of data - about 500 GB - on the internal hard drive of a desktop PC. This includes music, videos, PDFs... you name it. I want to copy everything to an external USB hard drive (1.5 tb capacity). The desktop PC runs Ubuntu. To being with, I simply plugged in and mounted the hard drive and dragged the top-level folder onto the drive. It's started copying, but it seems to be proceeding very slowly. About 10 minutes later and it's only done about 500 MB. I'm sure this is slower than what I could achieve with less total data. So I'm wondering if there's a quicker way of doing this. Would it be better to copy it in portions of 500MB or so, rather than all at once?

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• Rsync over ssh with root access on both sides

  - by Tim Abell

  Hi, I have one older ubuntu server, and one newer debian server and I am migrating data from the old one to the new one. I want to use rsync to transfer data across to make final migration easier and quicker than the equivalent tar/scp/untar process. As an example, I want to sync the home folders one at a time to the new server. This requires root access at both ends as not all files at the source side are world readable and the destination has to be written with correct permissions into /home. I can't figure out how to give rsync root access on both sides. I've seen a few related questions, but none quite match what I'm trying to do. I have sudo set up and working on both servers.

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• xf86OpenConsole: Cannot open /dev/tty0 (No such file or directory)

  - by mazgalici

  root@mazgalici:~# startx X.Org X Server 1.7.6 Release Date: 2010-03-17 X Protocol Version 11, Revision 0 Build Operating System: Linux 2.6.24-28-server i686 Ubuntu Current Operating System: Linux mazgalici 2.6.18-194.26.1.el5.028stab079.2PAE #1 SMP Fri Dec 17 19:34:22 MSK 2010 i686 Kernel command line: quiet Build Date: 10 November 2010 11:25:26AM xorg-server 2:1.7.6-2ubuntu7.4 (For technical support please see ) Current version of pixman: 0.16.4 Before reporting problems, check to make sure that you have the latest version. Markers: (--) probed, (**) from config file, (==) default setting, (++) from command line, (!!) notice, (II) informational, (WW) warning, (EE) error, (NI) not implemented, (??) unknown. (==) Log file: "/var/log/Xorg.0.log", Time: Tue Jan 11 01:28:48 2011 (==) Using config directory: "/usr/lib/X11/xorg.conf.d" Fatal server error: xf86OpenConsole: Cannot open /dev/tty0 (No such file or directory) Please consult the The X.Org Foundation support at http://wiki.x.org for help. Please also check the log file at "/var/log/Xorg.0.log" for additional information. ddxSigGiveUp: Closing log

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• How to load previous kernel via ssh?

  - by Aamir

  I work remotely on my work computer. I am also the root of the workstation that I am sharing with my colleague. Yesterday, I upgraded the kernel to 2.6.31-17 when asked by the update manager but refrained from restarting because I knew my NVIDIA and several other kernel modules wouldn't work. Unfortunately my colleague who is a linux noob restarted the machine and here I am :( I am thinking of changing the symlinks /initrd.img and /vmlinuz to the previous kernel image and use kexec. Please tell some better way to load the 2.6.31-16 release of kernel from ssh and not the grub boot menu. I am using Ubuntu Karmic.

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• Is it bad to have a very full hard drive on a high traffic database server?

  - by MikeN

  Running an Ubuntu server with MySQL for a high traffic production database server. Nothing else is running on the machine except the MySQL instance. We store daily database backups on the DB server, is there any performance hit or reason why we should keep the hard disk relatively empty? If the disk is filled up to 86%+ with the database and all of the backups, does it hurt performance at all? So would the DB server running with 86-90%+ full capacity perform less well in any way than the server running with only a 10% full disk? The total disk size on the server is over 1 TB so even 10% of the disk should be enough for basic O/S swapping and such.

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• why is 64 bits version called AMD64 and 32 bits version called i386?

  - by ajsie

  I have never understood this. This is what i know: 64 bits OS if you want to handle more than 2GB RAM. Else, 32 bits OS. So on Ubuntu's homepage you can download either 64 bits or 32 bits. But the 64 bits is called amd64 and the 32 bits is called i386. So i have to have a AMD processor to run amd64? And intel to run i386? And if someone codes a software (lets say Apache). Does he have to code one 32 bits and one 64 bits? Do some softwares only exist for 32 and not 64 and vice versa? Thanks in advance!

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• How to troubleshoot memory card read?

  - by shinjin

  The built in memory card reader in my laptop mounts SD cards as read-only only. This happens both in Windows 7 and Ubuntu. Most of the time. Ever now an then it works. After a some non-deterministic combination of uninstalling/reinstalling/disabling/enabling of the driver with the mandatory reboots the card reader works for a while. Is there any sane way to troubleshoot if it's an actual hardware problem, or just a matter of drivers? I've tested it with several SD cards, that work just fine in other devices. System: Acer Aspire 8951G, Windows 7-64bit

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• A raw dump from a corrupted large file

  - by Masoud M.

  I have a large .rar file inside partion D (Windows7/NTFS). It's corrupted due to bad sector (I think) and when I copy it to another place (External-HDD) the system freezes after 88% of progress. I even tried to copy it with my Ubuntu and same problem occurred. Also I tried chkdsk and it dosen't fix it. I think my last chance is dump that file with a tool which ignores bad sectors and create a raw copy of it. Then I will repair the file with rar tools. But I can not found a tool to raw dump a specific file. (In linux there is dd tool but it dumps all partition and I can not use it) So, Is somebody know a tool to do a raw dump from a file?

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• Tomcat access logs - are failed requests included?

  - by Maxim Eliseev

  We have a RESTful web service (Java, hosted in Tomcat on Ubuntu on Amazon EC2). From time to time it fails (not every week). When it fails, Java CPU consumption goes to 100% and it takes all available memory. It does not finish by itself. I have to restart the server. There is nothing suspicious in Tomcat access logs. I guess one of our users could submit a very "heavy" request which brought the server down. Is it possible this request is not in Tomcat logs since it never finished?

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• Slow write speeds on new Gigabit home file server

  - by Ryan Holder

  So I finally got all my parts delivered to setup a home file/backup server this week. It's currently running Ubuntu Server and I'm using Samba to share files on my network. The server currently has a 2TB WD Green drive in it connected to a Asus M5A78L-M This is then connected via CAT6a to my new Gigabit switch (TP-Link TL-SG1005D). My home desktop is then also connected to this switch and again also through CAT6a cable. Currently when transfering files I will get a perfect 100MB/s read from the server to my Windows machine. When copying from my Windows machine to the server I get around 30/38MB/s. I know this drive is capable is faster speeds so would anybody have an idea of where the bottleneck is? Any help would be greatly appreciated :) EDIT: I have found ftp's write speed is much closer to what my Samba read speed is so I'm going to give it a guess that is a software problem rather than hardware

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• Best practice for ONLY allowing MySQL access to a server?

  - by Calvin Froedge

  Here's the use case: I have a SaaS system that was built (dev environment) on a single box. I've moved everything to a cloud environment running Ubuntu 10.10. One server runs the application, the other runs the database. The basic idea is that the server that runs the database should only be accessible by the application and the administrator's machine, who both have correct RSA keys. My question: Would it be better practice to use a firewall to block access to ALL ports except MySQL, or skip firewall / iptables and just disable all other services / ports completely? Furthermore, should I run MySQL on a non-standard port? This database will hold quite sensitive information and I want to make sure I'm doing everything possible to properly safeguard it. Thanks in advance. I've been reading here for a while but this is the first question that I've asked. I'll try to answer some as well = )

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• .htaccess deny from all does not work?

  - by jeffery_the_wind

  I am running Apache 2.2.20 on a Ubuntu 11.04 web server. I have a Joomla site running on it, but I have also added some custom content. In the main web directly I have added a folder /images/sub_folder and in this sub_folder I have put a bunch of pictures. I do not want anyone to be able to simply access these pictures directly from the web, so I made a .htaccess file in that sub_folder and just put the following line in it: deny from all There doesn't seem to be any effect, I can still access the images directly from a web browser. I have restarted the Apache service. What am I doing wrong? Thanks Tim

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• Minimize VirtualBox Hard Drive disk

  - by Aviv

  I have Ubuntu Server 10.04 TLS installed on a Virtual Machine in a VirtualBox. The size of the Hard Drive is dynamic growing hard drive and the maximum is 32GB. At the beginning i had 4GB on the Hard Drive and the size of the .vdi was 4GB. Lately the size of data on the disk is 15GB but the size of the .vdi is almost 32GB. Why is that? How can i pack / optimize / defrag the HD so it will be the same size of the data on the disk? Thanks.

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• Determine process using a port, without sudo

  - by pat

  I'd like to find out which process (in particular, the process id) is using a given port. The one catch is, I don't want to use sudo, nor am I logged in as root. The processes I want this to work for are run by the same user that I want to find the process id - so I would have thought this was simple. Both lsof and netstat won't tell me the process id unless I run them using sudo - they will tell me that the port is being used though. As some extra context - I have various apps all connecting via SSH to a server I manage, and creating reverse port forwards. Once those are set up, my server does some processing using the forwarded port, and then the connection can be killed. If I can map specific ports (each app has their own) to processes, this is a simple script. Any suggestions? This is on an Ubuntu box, by the way - but I'm guessing any solution will be standard across most Linux distros.

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• how to debug mysql has gone?

  - by fefe

  I have a virtual machine(Ubuntu 12.04, MySQL 5.5) running under VMware and is dedicated to host a mysql server. I connect to this server on internal IP. I'm trying to find out why I get mysql server has gone error. One my windows machines apache it stops because of this issue. I have been trying to fine tune my mysql my.cnf with the following parameters but did not bring the desired result. # Instead of skip-networking the default is now to listen only on # localhost which is more compatible and is not less secure. bind-address = 0.0.0.0 # # * Fine Tuning # wait_timeout = 180 key_buffer = 384M max_allowed_packet = 64M thread_stack = 192K thread_cache_size = 8 # This replaces the startup script and checks MyISAM tables if needed # the first time they are touched myisam-recover = BACKUP max_connections = 500 table_cache = 64 #thread_concurrency = 10 # # * Query Cache Configuration # query_cache_limit = 1M query_cache_size = 32M how to debug this issue what is missing from configuration to avoid this error?

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