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• Which FTP Daemon should I use if I want to use MySQL for authentication?

  - by wag2639

  We want to set up a FTP Daemon on our Ubuntu 10.04 server that can use a simple (probably custom) built web interface for a FTP server using MySQL for authentication. It'll be public facing but only intended for use by a few customers or clients. I know vsftpd, ProFTPd, and Pure-FTPd but I'm not sure which is best for this application. Main features we would like: a. Very good MySQL authentication integration b. Able to specify a list folders/files (folder level is sufficient) each user has access to through MySQL Anything else would just be sprinkles on top.

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• How to take mysql replication backup

  - by user53864

  I have a MySQL master-master replication setup with a slave for each master(only one master used for read/writes at a time) on Ubuntu server. Wondering what would be the best way to schedule backup of replication databases with mysqldump. I have following clarifications because of which could not proceed further. Scheduling mysqldump backup on masters safe for replication? Connecting masters with GUI applications(workbench) for database manipulations(read, writes.. by developers) is safe? Any inputs are welcome.

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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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• Badwidth-Hogging Linux Server Causing Trouble

  - by BlairHippo

  We have a Linux server (2.6.28-11-generic #42-Ubuntu) that's misbehaving on a client site, gobbling up an entirely unacceptable percentage of the client's bandwidth, and we're trying to figure out what the heck it's doing. And the guy who had the sysadmin skillset has yet to be replaced. We're at a loss for what could be causing all that network traffic, and need to figure it out SOON. What log files should I be looking at to find this information? What analysis tools would you recommend for this task? Please note that I'm not looking for a tool that will allow me to analyze FUTURE traffic. The client is on the verge of shutting the machine off entirely; I need to figure out what it's been doing with the data I already have, if that's at all possible. My thanks in advance for helping a development monkey play sysadmin.

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• Burning iso images with wodim loses 2048 bytes at the end

  - by Grumbel

  If I burn an iso image with: wodim -data dev=/dev/scd0 in.iso and then read it back out with: dd if=/dev/scd0 of=out.iso The resulting files are not identical, out.iso is 2048 bytes shorter then in.iso. What is going on here and how can I fix it? Using Ubuntu 10.04 and Wodim 1.1.10 PS: dd always ends with an Input/output error, not just with this CD, but with all of them. I think its just a limitation of dd, but an explanation why it happens and how to avoid it would be welcome as well.

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• slow disk writes between host and guest

  - by Jure1873

  I've got a ubuntu (server kernel) on a amd x4, 4gb ram, 2x seagate sata 1 tb disks for testing virtual machines and the write performance is very slow. The two disks are in a software raid1 array, one small boot ext3 partition, 10gb system partition and the rest is a xfs partition (about 980) gb for data (virtual machines). If I'm copying files from the virtual machine to the host with rsync or scp the copy frequently stalls or goes at about 1mb/s. What's wrong? I've tried disabling barriers on xfs, increased logbufs, allocsize, but it seems nothing helps. The strange thing is that await (for example during copying) for sda is usually under 100, while for sdb is around 400. Any ideas on what could be wrong / what could I do to improve this setup?

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• ERROR : MySQL server has gone away while running query

  - by Rashmi Nama

  I am using ubuntu 12.04 version. I am connecting properly to MariaDB from command prompt,I have a database named Dealer and have some tables in it but when i running any query, it gives an error.My steps as follow: mysql -uroot -proot use dealer; select * from dealer_outlet limit 1; now error occours ERROR 2006 (HY000): MySQL server has gone away No connection. Trying to reconnect... Connection id: 3 Current database: dealer ERROR 2006 (HY000): MySQL server has gone away No connection. Trying to reconnect... ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (111 "Connection refused") ERROR: Can't connect to the server

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• Long lag and errors clicking gmail links in google chrome

  - by Doug T.

  I recently downloaded Google Chrome with Ubuntu 9.04 and love it. Ironically one site I consistently have issues with is gmail. When I enter gmail I will click a link, say an email or the inbox link. After a very long wait (on the order of 30 seconds to a couple of minutes) my page will load with an error such as: Some Gmail features have failed to load due to an Internet connectivity problem. If this problem persists, try reloading the page, using the older version, or using basic HTML mode. Learn More. Googling the symptoms has not helped. Has anyone else had any similar issues? Has anything helped?

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• VSFTPD: Cannot figure this thing out...

  - by A Wizard Did It

  Alright, I've been giving this the best that I can, reading through various tutorials on google, but I cannot seem to get vsftpd running the way I want. For a short while I had it working with one account, but then that stopped and I haven't been able to get it to work since. I've since reformated and reinstall Ubuntu 10.04 LTS. I used apt-get install vsftpd and that's where I am now... I'd really appreciate if anyone could help me understand exactly how this is supposed to work... How do I add FTP accounts and set their home directory to something like /var/www/public_html?

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• Why can't SVN checkout into a virtualbox shared folder?

  - by Alex Waters

  I am trying to checkout into the virtualbox shared folder with svn 1.7 in ubuntu 12.04 running as a guest on a windows 7 host. I had read that this error was a 1.6 problem, and updated - but am still receiving the error: svn: E000071: Can't move '/mnt/hostShare/code/www/.svn/tmp/svn-hsOG5X' to '/mnt/hostShare/code/www/trunk/statement.aspx?d=201108': Protocol error I found this blog post about the same error in a mac environment, but am finding that changing the folder/file permissions does nothing. vim .svn/entires just has the number 12 - does this need to be changed? Thank you for any assistance! (just another reason for why I prefer git...)

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• Secure Browsing, how [closed]

  - by Jhonny Bigodes

  Possible Duplicate: How to browse safely? What's the best way to browse "suspicious" sites safely. I know Firefox used to be "the thing", but now I don't think it is (IMHO). What I'm using now is a virtual machine (with virtual box), rhat I periodically format. I heard some time ago of a project that glued the 2 together (kinda... everytime you startup the program it used a fresh machine with a fresh browser), but I lost track of them So my question is: How can I Browse the web securely ? Ps.: In in ubuntu

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• Gitosis installation of public key not working...

  - by user29600

  I've been following this tutorial to install and setup git on Ubuntu Server 10.04 using Windows 7 as a client. However, after finally figuring out how it works (executed gitosis-init a bunch of times on the wrong key), I copied the id_rsa.pub file over to the server in /tmp folder and ran it again. Unfortunately it still doesn't work and when I execute git clone [email protected]:gitosis-admin.git it asks for gitosis's password rather than the RSA Passphrase. I'm assuming is the same problem this guy is having here... however, after following his instructions: Purge git-core and gitosis and manually remove the /srv/gitosis folder and following the instructions again (with the proper id_rsa.pub file this time), I'm still having the same issue. Anyone know what I'm doing wrong? Is there any way to probe for more information that might help in solving this?

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• df says disk is full, but it is not

  - by Chris

  On a virtualized server running Ubuntu 10.04, df reports the following: # df -h Filesystem Size Used Avail Use% Mounted on /dev/sda1 7.4G 7.0G 0 100% / none 498M 160K 498M 1% /dev none 500M 0 500M 0% /dev/shm none 500M 92K 500M 1% /var/run none 500M 0 500M 0% /var/lock none 500M 0 500M 0% /lib/init/rw /dev/sda3 917G 305G 566G 36% /home This is puzzling me for two reasons: 1.) df says that /dev/sda1, mounted at /, has a 7.4 gigabyte capacity, of which only 7.0 gigabytes are in use, yet it reports / being 100 percent full; and 2.) I can create files on / so it clearly does have space left. Possibly relevant is that the directory /www is a symbolic link to /home/www, which is on a different partition (/dev/sda3, mounted at /home). Can anyone offer suggestions on what might be going on here? The server appears to be working without issue, but I want to make sure there's not a problem with the partition table, file systems or something else which might result in implosion (or explosion) later.

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• Server downtime - are these APC warnings the cause?

  - by DisgruntledGoat

  Yesterday I had a problem with my dedicated server (Ubuntu 10.04, LAMP). It wasn't down per se, but running incredibly slowly as if we had a massive overload of visitors (though I don't think we did). It's running smoothly again now. I've been checking through log files etc to see if I can find any issues, the only strange thing is a bunch of these errors, occurring at about the same time as the downtime: [apc-warning] Unable to allocate memory for pool. in [file] on line 49. And a bit later on: [apc-warning] GC cache entry '[file1]' (dev=2056 ino=8988092) was on gc-list for 3601 seconds in [file2] on line 746. Could these errors indicate the cause of the server slowdown, or are they simply a result of the server being slow in the first place? What would be the solution?

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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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• Open file in local text editor from within an SSH connection

  - by Sam

  I'm not a vim guy. I'd like to be able to open log files in Sublime Text when in an SSH connection from within Terminal. Is there a way I could do this? I'm thinking there must be a command or something that could copy the file over to a temporary directory in OS X and then open it in Sublime Text, and when I save it, it'll copy back to the original location through SSH; similar to how FileZilla does it. I'm on Mac OS X MT. The server I SSH into is running Ubuntu. I'm using Terminal.

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• Samba users not added untill they logon first? Edit: How do I add users to tdbsam without a password prompt?

  - by glisignoli

  I add users to my server with the command useradd -m -p PASS_HASH -s /usr/sbin/nologin USERNAME Then I try to access their samba home share, but it never shows up until I login with the user: root:~$sudo login failtest Password:###### Added user failtest. Is there some way of added the user without logging in? Edit: The problem is that the user is added with the useradd command, but ubuntu seems to run an initalisation script when the user logs on for the first time. This script then adds that user to the tdbsam user database. Finding the initalisation script or the method it uses to add a user to the tdbsam database without requiring any user input (as smbpasswd -a USER prompts the user for a password). So all I need is a way to add a user+pass to the tdbsam database without prompting a user for a password (eg: samaba-add-user.sh USERNAME PASSWORD).

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• Standalone server setup for compute capacity

  - by mikera

  I'm developing an application for my company that will require a lot of compute capacity (running some very big mathematical calculations), and looking for some form of server setup to do this. For various reasons, we want to run this on-site in our office rather than hosting it externally. It's been a while since I last had to set up my own servers so I thought I would tap into the collective wisdom of serverfault! My broad requirements are: Budget $30-50k, with an aim to get as much compute capacity as possible for that budget 64-bit servers suitable to run Ubuntu Linux + Java Some relatively standalone rack that can be installed in secure office space Fast/low latency network connections between the servers, but don't really care about connectivity to the outside world Storage capacity shared between the servers - they don't necessarily need their own storage providing they can be booted from a common image Downtime can be tolerated (since the calculations are run in batch mode) The software itself is fault-tolerant, so there is no need for extra resiliency in the server setup (cheap replaceable commodity parts will be fine in general) Given these requirements what kind of setup would you recommend and why?

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• I just deleted "/bin". What's the best way to recover?

  - by Tom Marthenal

  I just ran (not on purpose!) rm -rf /bin. I've booted down the computer and am using Finnix to try to recover from it. I have succeeded in mounting the drive, and confirmed that, yes, the entire /bin folder is deleted. Is it possible to recover from this without reinstalling the OS? I'm thinking that I could setup a VM with the same OS and architecture (Ubuntu Server 11.10 alpha release, x86) and install all the packages I had installed on the server, then just copy the /bin folder. Will this work? Am I better off just starting over?

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• A can ping B, B can ping C but A cant ping C. How do i connect A to C (ethernet)?

  - by user16654

  I have a computer at home with ip 192.168.221.xxx I have another computer at work that I can ping and it has 2 ip addresses: 192.168.1.xxx and 192.168.0.xxx. Those last 2 addresses have the same gateway ie 192.168.1.1 . The computer at work is connected to a hub. That hub also has an embedded device connected to it with address 192.168.0.xxx Now from my home computer I cannot ping this embedded device. How would I connect to it without changing the subnetwork it connects to? I can ping the embedded device from my work computer and I can ping the work computer from my home computer. So I am trying to connect to the embedded device from my home computer through my work computer. Port forwarding? how would I establish that on Ubuntu?

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• Add iphones, ipads to existing OpenVPN server

  - by Zoran

  Could someone please provide me with info How to connect iphone and ipad to a existing OpenVPN server based on Ubuntu 8.04? I saw similar posts (such is Simplest VPN setup for iphone on Debian Linux?) but I haven't seen answer which will help me. Most of our client machines (whic are connecting to OpenVPN) are Windows 7 & Vista. Now I have to add several iphone and ipad users. How to accomplish that task? EDIT: One more thing, I can not use GuizmoVPN since that I wil have to jailbreak iphone which is not possoble solution

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• How can I set up an FTP user with a home directory inside another user's home folder?

  - by simon180

  Hi I have an Ubuntu (Hardy) server which I am using to host multiple websites. All of the sites are stored in subfolders of a public_html folder for my main login to the server and accessed via a single SSH account. I now have a website user who wants FTP (or similar) access to enable them to upload various files etc to the directory where their website is situated, however I still need the SSH account to have access to this directory as I may need to make changes using my master account. Basically I want to create an FTP account (I have VSFTPD installed) for a user with the home directory inside my own user account but they should only be able to read/write to this folder or its subfolders but not go further up the directory tree. How can I achieve this? Thanks

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• Force ID of user created by apt-get

  - by Bart van Heukelom

  Context: I'm automatically installing postgresql-9.1 on an Ubuntu server with apt-get. This creates the required postgres user. The Postgres data is on an external volume that survives reinstalls. This data is obviously owned by the postgres user. The problem I'm having is that the ownership is not recorded under the name postgres, but under the UID that postgres had at creation time. When the server is reinstalled, postgres sometimes gets a different UID, and no longer owns the data directory, and thus does not work. Question: Can I force the UID of the user postgres created by apt-get to something fixed? Or is there another way to solve my problem? (As you may have deduced, this is on Amazon EC2 with the data on an EBS volume)

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• Install Linux with two hard drives

  - by rdecourt

  I've a machine with two hard drives. The first one has 80 GB and the second has 120 GB. I'm about to format this machine and install Linux, and I want to install all the main partitions (/, /boot, /usr/, etc.) on the first hard disk drive (sda) and mount the /home and /var partition on second disk (sdb). Is this possible, and do I have to do something after the instalation? Or is the second hard disk drive automatically mounted? How can I do it? I won't do it, but is there any problem to mount /boot on the second hard disk drive? I'm using Ubuntu 12.04.

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• Can ping/nmap server, nothing else

  - by lowgain

  I was SSHed into our ubuntu LAMP server , and was just doing a svn update, which hung. I disconnected, and since then, I have not been able to SSH in or view any of our websites (neither from my network or through a remote machine). I would have just assumed the server went down, but I can ping the machine and get really quick responses. Using nmap on the box shows all the normal ports open, so I am confused This server is hosted remotely in a datacenter, do I have any remaining options except contacting them for support? Thanks!

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