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• centos postfix send email problem

  - by Catalin

  Hello. I have a big problem with postfix. I can receive mail in webmin and outlook but I can't send (only on local I can - user to user). Dovecot is working just fine. Sendmail is disable. Please help me. postfix -n postfix: invalid option -- n postfix: fatal: usage: postfix [-c config_dir] [-Dv] command [root@xprivatecams usr]# postconf -n alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases broken_sasl_auth_clients = yes command_directory = /usr/sbin config_directory = /etc/postfix daemon_directory = /usr/libexec/postfix debug_peer_level = 2 home_mailbox = Maildir/ html_directory = no inet_interfaces = all mail_owner = postfix mailbox_command = mailq_path = /usr/bin/mailq.postfix manpage_directory = /usr/share/man milter_default_action = acceptsmtpd_tls_auth_only = no milter_protocol = 2 mydestination = $myhostname, localhost.$mydomain, localhost myhostname = xprivatecams.com mynetworks = 94.177.41.0/24, 127.0.0.0/8 newaliases_path = /usr/bin/newaliases.postfix non_smtpd_milters = inet:localhost:20207 queue_directory = /var/spool/postfix readme_directory = /usr/share/doc/postfix-2.3.3/README_FILES sample_directory = /usr/share/doc/postfix-2.3.3/samples sendmail_path = /usr/sbin/sendmail.postfix setgid_group = postdrop smtp_tls_note_starttls_offer = yes smtp_use_tls = yes smtpd_milters = inet:localhost:20207 smtpd_recipient_restrictions = permit_sasl_authenticated,permit_mynetworks,reject_unauth_destination smtpd_sasl_auth_enable = yes smtpd_sasl_authenticated_header = yes smtpd_sasl_local_domain = smtpd_sasl_security_options = noanonymous smtpd_tls_CAfile = /etc/postfix/ssl/cacert.pem smtpd_tls_auth_only = no smtpd_tls_cert_file = /etc/postfix/ssl/smtpd.crt smtpd_tls_key_file = /etc/postfix/ssl/smtpd.key smtpd_tls_loglevel = 1 smtpd_tls_received_header = yes smtpd_tls_session_cache_timeout = 3600s smtpd_use_tls = yes tls_random_source = dev:/dev/urandom unknown_local_recipient_reject_code = 550 Jan 18 00:46:17 xprivatecams postfix/postfix-script: starting the Postfix mail system Jan 18 00:46:17 xprivatecams postfix/master[15545]: daemon started -- version 2.3.3, configuration /etc/postfix Jan 18 00:48:00 xprivatecams postfix/pickup[15546]: EDE7EA8001B: uid=0 from=<[email protected]> Jan 18 00:48:00 xprivatecams postfix/cleanup[15817]: EDE7EA8001B: message-id=<[email protected]> Jan 18 00:48:00 xprivatecams opendkim[2776]: EDE7EA8001B: DKIM-Signature header added Jan 18 00:48:01 xprivatecams postfix/qmgr[15547]: EDE7EA8001B: from=<[email protected]>, size=615, nrcpt=1 (queue active) Jan 18 00:48:31 xprivatecams postfix/smtp[15820]: connect to mail.flabell.com[72.47.224.75]: Connection timed out (port 25) Jan 18 00:48:31 xprivatecams postfix/smtp[15820]: EDE7EA8001B: to=<[email protected]>, relay=none, delay=30, delays=0.08/0.03/30/0, dsn=4.4.1, status=deferred (connect to mail.flabell.com[72.47.224.75]: Connection timed out) telnet 94.177.41.70 25 Trying 94.177.41.70... Connected to xprivatecams.com (94.177.41.70). Escape character is '^]'. 220 xprivatecams.com ESMTP Postfix ehlo me 250-xprivatecams.com 250-PIPELINING 250-SIZE 10240000 250-VRFY 250-ETRN 250-STARTTLS 250-AUTH LOGIN PLAIN 250-AUTH=LOGIN PLAIN 250-ENHANCEDSTATUSCODES 250-8BITMIME 250 DSN

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• Setting up ProxyPass for a Virtualmin virtual server

  - by Andy Ibanez

  I am trying to set up my web server so that I can server multiple Ghost.org blogs. I am stuck in one crucial step. To be honest, my knowledge in servers is not so big, so I request your help to do this. Basically, a tutorial I'm reading suggests I set up a VirtualHost in this way: NameVirtualHost *:80 <VirtualHost *:80> ServerName your-url.com ServerAlias www.your-url.com ProxyRequests off ProxyPass / http://127.0.0.1:2368/ ProxyPassReverse / http:/127.0.0.1:2368/ </VirtualHost> So I have gone to the Virtual site on Virtualmin to try to add everything as is. Services Configure Website Edit Directives The problem is, the previous page (Services Configure website) says I can't edit the port: This Apache virtual host belongs to the Virtualmin server linguist.andyibanez.com, so the address, port, base directory and hostname cannot be changed here. And whenever I try to add the ProxyRequests off (the other two can be added fine) directive in Edit Directives manually, I'm simply told that the directive can't be there. So what is the right way to "add" the last three directives in the VirtualHost above to my sub server? Maybe I'm missing a menu item that will help me with this? I request your help as I have looked for a while, Google keeps thinking I want to serve Webmin via Apache when I google "Set up Virtualmin proxypass", and I have no clue what to do.

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• Visual Studio 2012 Very Slow Typing

  - by DaoCacao

  I have a problem. After SP1 update, passing some time, VS 2012 becomes very-very slow when typing text. Solution size is not big, PC is quite powerful, it has 16GB of RAM, SSD drive, and i7-2600. I have attached using another VS and I see in debugger a lot of exceptions: First-chance exception at 0x753BB9BC in devenv.exe: Microsoft C++ exception: CVcsException at memory location 0x0027DF0C. First-chance exception at 0x753BB9BC in devenv.exe: Microsoft C++ exception: CVcsException at memory location 0x0027DF0C. First-chance exception at 0x753BB9BC (KernelBase.dll) in devenv.exe: 0xE0434352 (parameters: 0x80131509, 0x00000000, 0x00000000, 0x00000000, 0x64BF0000). First-chance exception at 0x753BB9BC in devenv.exe: Microsoft C++ exception: CVcsException at memory location 0x0027DF0C. First-chance exception at 0x753BB9BC in devenv.exe: Microsoft C++ exception: CVcsException at memory location 0x0027DF0C. First-chance exception at 0x753BB9BC (KernelBase.dll) in devenv.exe: 0xE0434352 (parameters: 0x80131509, 0x00000000, 0x00000000, 0x00000000, 0x64BF0000). The thread 0x288c has exited with code 0 (0x0). Anyone have any ideas on what CVcsException is? Googling it gives almost nothing. How do I get rid of this problem?

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• COM+/Desktop Heap errors in IIS affecting sites at random?

  - by tresstylez

  We have a Win2K3 server that is hosting 30+ sites. Each site is configured to have its own unique application pool -- so that we can manually recycle specific sites if needed and not kill sessions for the others. From what I've read, the consequence of this type of setup is that each application pool worker process gets allocated a Desktop Heap (normally 512 kb's) and we limit the number of app pools we can serve. http://blogs.msdn.com/b/david.wang/archive/2006/01/25/security-considerations-of-usesharedwpdesktop-on-iis6.aspx PROBLEM: What we're seeing is that occasionally COM+ errors get triggered, presumably by hitting our 512 kb limit of the desktop heap -- and certain sites become unresponsive (or have errors) until we manually recycle that specific app pool. I know that I can increase the desktop heap limit to 1024, and make other tweaks/tunes, but I've been tasked with finding out what exactly causes one site's heap to max out as opposed to another. It seems that when we start seeing COM+ errors, the sites it affects are random -- small sites or big sites (heavier used). Is it based on process id? Traffic? Any pointers on understanding this a little more would be excellent. Thanks! jg

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• Slow VM on esxi 4.1

  - by user57432

  We have a FreeBSD 64bit running on a esxi 4.1, the hardware platform is a DELL R710 with 2 x 56xx (intel 6core cpu) and 48 GB ram. The FreeBSD vm is very slow, when we compiles/builds something on it, it takes 5 minuts and it says "build time 18 seconds.". There's no vmtools installed on the vm. The same vm is installaed on another R710 running esxi 4.0 for dell and there's no problems with that one. Does anyone have any idea about what to look for? the VMs on the second server (ESXi 4.1) is a clone of the VMs running on the first VMserver (ESXi 4.0 Dell edition). It's not possible for me to move the VM back to the first server since the file contaning the vm is too big. We installed the new esxi with a datasore with 8mb blocks because 1mb blocks dident allow for the file size we needed. It looks like the www server on the new ESXi 4.1 works fine, but I havent really tested it. There's not installed vmtools on any of the VMs (FreeBSD). The block size on the second VM (ESXi 4.1) datastorage is 8mb and 1mb on the first (ESXi 4.0)

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• How to generate customized sudoers files in puppet depending on the environment they're deployed to?

  - by gozu

  the sysadmins are present in the sudoers files of all environments, but other sudoers are not. Different environments all have slightly different sudoers. Most of the time, 90% of users are the same, and 10% vary so we cannot have only one sudoers file for everything. Right now, we are using puppet with 10 different files with names like sudoers.production1, sudoers.production2, sudoers.production3, sudoers.testing1, sudoers.staging1 and so forth. Puppet then picks the file to deploy based on the server's $domain (ex: dbserver.staging1.acme.com) or $hardwaremodel. It works fine but it's a nightmare to maintain so many files. I'd like to autogenerate sudoers files based on the server's domain and have only one big file with all the sudoers permissions for all users and all environments. Something that looks like: User_Alias ADMINS = abe, bob, carol, dave case $domain { "staging1.acme.com" { #add dev1,dev2,tester1,tester2 to sudoers file } "testing2.acme.com" { #add tester1, tester3, tester4 to sudoers file } What's the best way to go about this? Suggestions for alternatives are welcome. I'd appreciate any tips. Update 1: For security reasons, we'd rather not concatenate a bunch of files from a folder located on a puppet client in case someone puts a file in there (maliciously or not) and either breaks the combined file or inserts something in it. Most importantly, for usability, we'd like to keep the number of sudoers related files (fragment or complete) on puppet server to either 3 (prod/stage/test) or preferably 1 file. this file would (somehow) generate sudoers files on the puppet server and send one customized file to each puppet client. The purpose of this would be only searching for a username in a single file and removing it quicker than doing it on 11 files. When adding a user to a bunch of environments, it won't be as quick, but only one file would need to be opened and looked at, greatly reducing the chances of an omission. our Sudo version is 1.6.9p8 so we can't use /sudoers.d folder, only a sudoers file.

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• Crash and Centos

  - by Jackob

  Hello guys and girls, I've a big problem it's the second time that my server crashed. I tried to check every thing and seems correct except this /var/log/messages: May 25 20:16:11 srv1 kernel: swap_free: Bad swap offset entry 00300000 May 25 20:16:33 srv1 kernel: swap_free: Unused swap offset entry 00080000 May 25 20:16:33 srv1 kernel: swap_free: Bad swap offset entry 00340000 May 25 20:16:33 srv1 kernel: swap_free: Unused swap offset entry 000c0000 May 25 20:16:33 srv1 kernel: swap_free: Bad swap offset entry 00a00000 May 25 20:16:33 srv1 kernel: swap_free: Bad swap offset entry 00200000 May 25 20:16:33 srv1 kernel: swap_free: Bad swap offset entry 00890000 May 25 20:16:33 srv1 kernel: swap_free: Unused swap offset entry 00080000 May 25 20:16:33 srv1 kernel: swap_free: Bad swap offset entry 00f00000 May 25 20:16:33 srv1 kernel: swap_free: Bad swap offset entry 00f90000 May 25 20:16:33 srv1 kernel: swap_free: Bad swap offset entry 00980000 May 25 20:16:33 srv1 kernel: swap_free: Bad swap offset entry 00980000 May 25 20:16:33 srv1 kernel: swap_free: Bad swap offset entry 00820000 May 25 20:16:33 srv1 kernel: swap_free: Unused swap offset entry 000d0000 May 25 20:16:33 srv1 kernel: swap_free: Bad swap offset entry 00a60000 May 25 20:16:33 srv1 kernel: swap_free: Bad swap offset entry 00a20000 May 25 20:16:33 srv1 kernel: swap_free: Bad swap offset entry 009a0000 May 25 20:16:33 srv1 kernel: swap_free: Bad swap offset entry 00170000 May 25 20:16:33 srv1 kernel: swap_free: Bad swap offset entry 00f20000 May 25 20:16:33 srv1 kernel: swap_free: Bad swap offset entry 00b60000 May 25 20:16:33 srv1 kernel: swap_free: Bad swap offset entry 00a30000 May 25 20:16:33 srv1 kernel: swap_free: Bad swap offset entry 00320000 May 25 20:16:47 srv1 kernel: swap_free: Bad swap offset entry 002c0000 May 25 20:16:47 srv1 kernel: Eeek! page_mapcount(page) went negative! (-1) What can be my problem? Thanks so much!

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• Problems building nodejs on MacOS Snow Leopard

  - by mrwooster

  I am having trouble building nodejs on MacOS Snow Leopard. I think it might have something to do with my PATH variable not being set correctly for the developer tools location. For some reason, the Developer tools (gcc, g++, make etc) are all stored in /Developer/usr/bin I added it to my PATH variable as follows: $ export PATH=$PATH:/Developer/usr/bin $ echo $PATH /opt/local/bin:/opt/local/sbin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/local/git/bin:/usr/X11/bin:/Developer/usr/bin When i try to configure it complains about not finding open-ssl, ok, not a big problem. So I try with --without-ssl : $ ./configure --without-ssl Checking for program g++ or c++ : /Developer/usr/bin/g++ Checking for program cpp : /Developer/usr/bin/cpp Checking for program ar : /usr/bin/ar Checking for program ranlib : /Developer/usr/bin/ranlib Checking for g++ : ok Checking for program gcc or cc : /Developer/usr/bin/gcc Checking for gcc : ok Checking for library dl : yes Checking for library util : yes Checking for library rt : not found --- libeio --- Checking for library pthread : yes Checking for function pthread_create : not found /Users/Guy/git_src/node/node/deps/libeio/wscript:13: error: the configuration failed (see '/Users/Guy/git_src/node/node/build/config.log') Anyone know how I can get round this? I am suspicious that it might be something to do with the PATH or another ENV variable, but not sure. Thanks G

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• Reviving a dead laptop battery

  - by Alex Ciminian

  Is there any way to revive a dead laptop battery? I have a three year old Dell Latitude laptop that I've been using pretty intensively. After a year or so, the battery dropped dead - if I plug the laptop out it goes into hibernation in a matter of seconds. Probably this was because I kept working on it plugged in all the time, but back then I didn't realize what effect it could have (this was my first laptop). Currently, I'm searching for a new laptop and I was thinking if there was something I could do to get the battery back working. I've found several links (sorry, I'm a new user so I can't post them) about freezing Li-ion batteries, but the opinions seem to mixed - some say that it worked for them, some not. If you've tried the freezing technique please let me know if it works. Or if you know another way to make a dead battery work again, please share here. I've already seen this thread, but I'm not very handy with soldering. If it's the only alternative I'll try it, but there's a big chance that I'll screw it up. Thanks!

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• Why do I have untrusted certificates for Google, Yahoo, Mozilla and others?

  - by jackweirdy

  In the HTTPS/SSL section of chrome://chrome/settings, I see the following: What does this mean, and is there something wrong? I have a basic understanding of SSL/TLS - I'm not claiming to be completely familiar, but I'm fairly confident I know my way around it - but I don't understand why I have certificates installed on my machine specifically for these sites. From my understanding, I should have the certificates for Certificate Authorities, and any site I visit and use SSL/TLS should have a certificate signed by one of these trusted CAs for me to trust the site. My worry is that if someone has maliciously installed a certificate for these sites on my machine, they could perform a DNS spoofing attack (or a number of other attacks) to hijack my connection to my email account without me knowing, and as they've got the private counterpart to the certificate on my machine, decrypt the communication. NB: I'm also aware that CA certificates aren't just within Chromium and are used system wide as part of libssl - they're stored in /etc/ssl/certs. What I'd like to know is: Is this correct? - The big red boxes make me think no Is this malicious or benign? What can I do to resolve this problem? (If indeed it is a problem) Thanks :)

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• Windows Server 2008 R2 SP1 Drivers Missing Would Not Install?

  - by bleepzter

  I am building my dev machine with WS2008R2SP1. I consider Windows Server as the best development environment for C# since I tend to focus on server-centric (integration) applications. The desktop flavor of Windows (7) doesn't play nicely with things like Commerce Server or BizTalk... so I to like stick to the environment I develop for. Previously I used to develop inside of VM's but I've found that it is super inefficient and tends to take a toll on the laptops. (I've gone through two of them in 6 months). Problem is that I multiple devices that do not want to be recognized by Windows: My machine is Dell Precision M4500: Intel Core i7-Q740, 1TB HDD, 8GB RAM, Dell re-branded Broadcom DW1501 802x11n Half-Mini Card, Dell re-branded Broadcom DW375 Bluetooh Module, Intel 82577LM Gigabit Network connection NVidia Quadro FX1800 Graphics The devices in question are the Dell rebranded broadcom network and bluetooth adapters: Broadcom USH: USB\VID_0A5C&PID_5800&REV_0101&MI_00 USB\VID_0A5C&PID_5800&MI_00 DW375 Bluetooth Module USB\VID_413C&PID_8187&REV_0517 USB\VID_413C&PID_8187 When I ran the broadcom installers I get "Operating System not supported" which I think is a big oversight on Broadcom's part. Why check for system version string? UGHGHGH Moreover if I try to manually force the driver in windows... I get an error: Driver Management concluded the process to install driver FileRepository\btwampsecfl.inf_amd64_neutral_d8fc2b85d035ed47\btwampsecfl.inf for Device Instance ID USB\VID_0A5C&PID_5800&MI_00\7&66DE6C9&0&0000 with the following status: 0xe0000217. '- or - Driver Management concluded the process to install driver FileRepository\btwampfl.inf_amd64_neutral_d4c4acf036c61299\btwampfl.inf for Device Instance ID USB\VID_413C&PID_8187\90004EEEF5A6 with the following status: 0xe0000217. I googled the 0xe0000217 error code and it says Bad service install section in the driver inf file... Any ideas on how to fix this? I also tried the post by BetaIQ on MSDN Forum, unfortunately the links to the driver package included in the post were dead :( PS. On a side note I also do mobile development for Android, iOS, and Windows Phone, and BB. Having the bluetooth is quite useful with mobile devices.

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• Start Menu Shortcuts resisting reorganisation

  - by seusr

  Running Win7. The Start Menu was getting too big, so I've navigated to C:\ProgramData\Microsoft\Windows\Start Menu\Programs and created some sub-folders in various categories [image editors, system utilities, media players, security for example] in which to group the shortcuts. Having created the group folders, I've dragged and dropped the Start Menu shortcuts into them. However it seems all Start Menu shortcuts are not alike. Some programs, their shortcut folders having been moved from the Start Menu, spawn NEW [but empty] folders bearing their company names in the top level of the Start Menu eg AVICodec Some programs don't have Start Menu shortcut folders that can be seen in WinExplorer [or equiv] at all, even though they turn up under the Start Menu itself. It seems these can be moved where they are visible i.e. in the Start - All Programs by dragging and dropping not just onto the desired folder but by hovering to expand the desired folder and then dropping between other shortcuts there. Eg Daum, Format Factory That's not such a problem, but why it's happening is a mystery. What's going on, and how to make these shortcuts behave normally or otherwise control them properly?

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• SSH garbling characters in vim/nano on remote server

  - by geerlingguy

  ... and it's driving me insane. Basically (this has been happening over the past couple months), I log into a few different CentOS servers (one Linode, another VPS, and a shared host to which I have shell access), running 5.5, 5.7, and 6, from my Mac running OS X Lion, using Terminal. Basically: $ ssh [email protected] [remote-host] $ nano somefile.txt Once I start editing the file, if I use the arrow keys to move around the cursor, or start deleting, then typing again, the cursor jumps around a bit, and if I save the file and reopen it, it's obvious that the cursor was, in fact, jumping all over the place on a line for no apparent reason. I end up getting things like "This is a neof text." When I had typed in (to the cursor-crazy editor) "This is a line of text." It's a big problem when it comes to editing configuration files, because I often have to edit one line, save and close, then reopen just to make sure that line is right... then edit another line... and it's getting quite annoying. I found Linode Lish Shell Vim and Nano rendering troubles: lines not appearing / cursor positions wrong, but I don't know if that relates much, since that's specifically referring to lish.

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• ZFS: Mirror vs. RAID-Z

  - by John Clayton

  I'm planning on building a file server using OpenSolaris and ZFS that will provide two primary services - be an iSCSI target for XenServer virtual machines & be a general home file server. The hardware I'm looking at includes 2x 4-port SATA controllers, 2x small boot drives (one on each controller), and 4x big drives for storage. This allows one free port per controller for upgrading the array down the road. Where I'm a little confused is how to setup the storage drives. For performance, mirroring appears to be king. I'm having a hard time seeing what the benefit would be of using RAIDZ over mirroring would be. With this setup I can see two options - two mirrored pools in one stripe, or RAIDZ2. Both should protect against 2 drive failures, and/or one controller failure...the only benefit of RAIDZ2 would be that any 2 drives could fail. The storage should be 50% of capacity in both cases, but the first should have much better performance, right? The other thing I'm trying to wrap my mind around is the benefit of mirrored arrays with more than two devices. For data integrity what, if any, would be the benefit of a RAIDZ over a three-way mirror? Since ZFS maintains file integrity what does RAIDZ bring to the table...doesn't ZFS's integrity checks negate the value of RAIDZ's parity?

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• My hard drive seems to be overheating... what should I do?

  - by George Edison

  After a cold boot, the hard drive in my notebook jumps to 56? within an hour or so of idling. Is 56? a cause for alarm? Notes: The notebook is on a flat desk and none of the vents are obstructed. The video card is currently at 55? and the CPU at 50?. It's a Western Digital 250GB hard drive. SMART reports the drive healthy but does warn that: Edit: this problem had a very surprise ending. I inverted the notebook and unscrewed some of the panels on the back (there was one covering the hard drive, and one that provided access to the memory). I couldn't see any dust, so I simply screwed everything back together and powered it on... and it worked! The temperature is now staying at 46?, and it feels notable cooler to the touch. So I can only assume that some internal fan was malfunctioning or something. Whatever the case, it's working now so I won't complain. Edit: I have an SSD now, so temperature isn't as big an issue as it was when I had a mechanical drive.

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• How to use most of memory available on MySQL

  - by Zilvinas

  I've got a MySQL server which has both InnoDB and MyISAM tables. InnoDB tablespace is quite small under 4 GB. MyISAM is big ~250 GB in total of which 50 GB is for indexes. Our server has 32 GB of RAM but it usually uses only ~8GB. Our key_buffer_size is only 2GB. But our key cache hit ratio is ~95%. I find it hard to believe.. Here's our key statistics: | Key_blocks_not_flushed | 1868 | | Key_blocks_unused | 109806 | | Key_blocks_used | 1714736 | | Key_read_requests | 19224818713 | | Key_reads | 60742294 | | Key_write_requests | 1607946768 | | Key_writes | 64788819 | key_cache_block_size is default at 1024. We have 52 GB's of index data and 2GB key cache is enough to get a 95% hit ratio. Is that possible? On the other side data set is 200GB and since MyISAM uses OS (Centos) caching I would expect it to use a lot more memory to cache accessed myisam data. But at this stage I see that key_buffer is completely used, our buffer pool size for innodb is 4gb and is also completely used that adds up to 6GB. Which means data is cached using just 1 GB? My question is how could I check where all the free memory could be used? How could I check if MyISAM hits OS cache for data reads instead of disk?

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• external drive enclosure -> software RAID 5?

  - by memilanuk

  Hello all, I have two older PCs on my LAN posing as 'servers'... one running FreeNAS off a USB stick using three 500GB hdds in a ZFS RAID-Z pool serving as storage for the LAN and one running Debian Lenny with an 80GB drive used as a general purpose 'tinker' box that I can ssh into, etc. Problem is that the SMART report for one of those 500GB drives in the FreeNAS box is showing some pre-failure attributes, and the whole array is a little small anyways. Rather than simply replace one 500GB drive with another 500GB drive, and have no backup of the file server, I'd like to upgrade all the drives to 2TB ones - but I have no where to store that much data in the mean while. As such, I started looking at getting a 4-bay external drive enclosure with an eSATA card for the Debian box, with the hopes of creating a RAID5 + LVM setup using those drives and backing the data up to that external drive enclosure. After the backup is done, replace the drives in the FreeNAS box and rebuild the array there and mirror the data back. Then, I'd have both the primary storage (on the FreeNAS box) and a backup (which I don't have currently) using the external drive enclosure on the Debian box. My big question is... most of these external drive boxes seem to claim support for JBOD, RAID 0, 1, 10, 5, etc. - should I presume that is simply fake RAID like many commodity mobos have, and not really usable in Linux? In that case, with all the drives hanging off the one eSATA connection, will Linux (specifically Debian Squeeze, as I plan on upgrading that box here shortly) see all four drives, or just the first one? Will I be able to configure them in a RAID5 array as desired? Thanks, Monte

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• Force database read to master if slave data is stale

  - by Jeff Storey

  I previously asked a specific question about this database replication for new user signup to which I got an answer, but I want to ask this in the more general sense. I have a database setup in which I am using a master/slave combination. I am using the slaves for load balancing (the data itself is partitioned/sharded across multiple databases, but each database has X slaves for load balancing). Let's say I write some data to the master. Now I do a subsequent read which hits a slave, but the slave has not yet caught up to the master. Is there a way (which can be done quickly since it will happen frequently) to determine if the data is stale in the slave so I can then route to the master? In my previous question, it was suggested to do simultaneous writes to the cache and the database. This solution seems practical, but there is still a chance that the data may have been removed from the cache but not yet updated in the slave. A possible solution is to ensure the cache is big enough (based on the typical application load) so the data will not be evicted within the time frame it takes to replicate the data. This seems like it may be feasible. Can anyone provide additional insight into this question? Thanks!

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• Sharing large (multi-Gb) files with clients

  - by Tim Long

  I wasn't sure if this was the best place for this question, but I think it is squarely in the realm of the IT admin so that's the reason I put it here. We need to share large files (several Gigabytes) with external clients. We need a simple way of reliably and automatically publishing these files so that clients can then download them. Our organization has Windows desktops and a Windows SBS 2011 server. Sharing from our server is probably suboptimal from the client's perspective, because of the low upstream bandwidth of typical ADSL (around 1 Mbps) - it would take all day (9 hours for a 4Gb file) for the client to download the file. Uploading to a 3rd party sever is good for the client but painful for us, because we then have to deal with a multi-hour upload. Uploading to a third-part server would be less problematic if it could be made reliable and automatic, e.g. something like a Groove/SharePoint Workspace, simply drop the file in and wait for it to synchronize - but Groove has a 2Gb limit which is not big enough. So ideally I'd like a service with the following attributes: Must work for files of at least 5Gb, preferably 10Gb Once the transfer is started, it must be reliable (i.e. not sensitive to disconnections and service outages) and completely automatic Ideally, the sender would get a notification when the transfer completes. Has to work with Windows based systems. Any suggestions?

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• PHP running too slow, always showing "504 Gateway Time-out"

  - by komase

  PHP running too slow, always showing "504 Gateway Time-out" My server spec: Dual core ATOM 330 CPU 2GB RAM Use nginx with PHP in fastcgi use eaccelerator CPU 74.3%id RAM used: 350MB of 2GB I have lots of sites in my server, with cron running every minutes all time, even on some minutes, double or triple cron running at same time. All my sites cron is heavy, usually the cron running more than one minutes. my nginx.conf has become too big until nginx refuse to start because too many sites in it. it has been solved by increasing server_names_hash_max_size. Im planning to add more sites in my server Now, opening my website always showing 504 Gateway Time-out. I have tested many eaccelerator and PHP setting, but this 504 Gateway Time-out still happen. the 504 Gateway Time-out will dissappeared when cron is disabled I have no idea: is this because not enough processor power? And what should I do? upgrade my processor? --------added this is top for my CPU just now: Cpu(s): 17.5%us, 3.8%sy, 0.1%ni, 71.6%id, 6.9%wa, 0.1%hi, 0.1%si, 0.0%st

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• Server cost for smartphone app with web service

  - by FrankieA

  Hello, I am working on a smartphone application that will require a backend web service - but I have absolutely clueless to how much it will cost. Web Service will handle: - login of users - cataloging of our user base - holding minimal profile information for users (the only binary data is a display picture which will be < 20k each) - performing some very minor calculation/algorithm before return results - All the above will be communicated to server from a smartphone (iPhone/BlackBerry/Android) Bandwidth Requirements: - We want to handle up to 10k users throughout the day. - I predict 10k * 50 HTTP requests a day = 500,000 requests a day * 30 = 15 million requests a month Space Requirements: - Data will be in SQL database. - I predict 1MB/user * 10k = 10GB + overhead. In other words - space is not a big issue. Software Requirements: (unless someone knows an alternative) - Windows Server 2008 + IIS - MSFT SQL Server Note: This is 100% new to me, so please hit me with all you got. Do I need Windows Server or are there alternative? Is it better to get multiple cheap servers to distribute load? Will Amazon S3 work for me? How about Windows Azure? Thank you!!

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• Dual Xeon Server voltages are low

  - by Mindflux

  I've got a whitebox server running CentOS 5.7. It's a Dual Xeon 5620, 24GB of RAM. The mainboard is a SuperMicro X8DT6-F and the chassis is a SC825TQ-R720LPB. Dual 720W Power supplies. We had a big power outage a couple weeks back that took down everything, I don't have any pre-power outage figures for this server, and the only reason I noticed these is because when I was bringing up the servers I was checking them out with more scrutiny than usual. http://i.imgur.com/rSjiw.png (Image of voltage readings) As you can see, CPU1 DIMM is low, +3.3V is high, 3.3VSB is high, +5v is high, +12v is REAL LOW (out of normal 5% (plus/minus))... and VBAT is off the charts. With my whitebox VAR we've tried the following: Swap out PSU with another server I have with the same PSUs. Try different power cord Update BMC/IPMI firmware in case readings were wrong (They aren't) Update BIOS Try different PDU Try a different outlet and/or circuit Replaced Voltage Regulator Unit At this point, the only thing we haven't done, seemingly is replace the mainboard.. which is what the next step will be unless something else shines some light on the situation. I should mention the system is rock solid otherwise which is a surprise given the 12v voltage is that far off.

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• MySQL replication - rapidly growing relay bin logs

  - by Rob Forrest

  Morning all, I've got a really strange situation here this morning much like a reportedly fixed MySQL bug. http://bugs.mysql.com/bug.php?id=28421 My relay bin logs are rapidly filling with an infinite loop of junk made of this sort of thing. #121018 5:40:04 server id 101 end_log_pos 15598207 #Append_block: file_id: 2244 block_len: 8192 # at 15598352 #121018 5:40:04 server id 101 end_log_pos 15606422 #Append_block: file_id: 2244 block_len: 8192 # at 15606567 ... # at 7163731 #121018 5:38:39 server id 101 end_log_pos 7171801 #Append_block: file_id: 2243 block_len: 8192 WARNING: Ignoring Append_block as there is no Create_file event for file_id: 2243 # at 7171946 #121018 5:38:39 server id 101 end_log_pos 7180016 #Append_block: file_id: 2243 block_len: 8192 WARNING: Ignoring Append_block as there is no Create_file event for file_id: 2243 These log files grow to 1Gb within about a minute before rotating and starting again. These big files are interspersed with 1 or 2 smaller files with just this in /*!40019 SET @@session.max_insert_delayed_threads=0*/; /*!50003 SET @OLD_COMPLETION_TYPE=@@COMPLETION_TYPE,COMPLETION_TYPE=0*/; DELIMITER /*!*/; # at 4 #121023 9:43:05 server id 100 end_log_pos 106 Start: binlog v 4, server v 5.1.61-log created 121023 9:43:05 BINLOG ' mViGUA9kAAAAZgAAAGoAAAAAAAQANS4xLjYxLWxvZwAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAEzgNAAgAEgAEBAQEEgAAUwAEGggAAAAICAgC '/*!*/; # at 106 #121023 9:43:05 server id 100 end_log_pos 156 Rotate to mysqld-relay-bin.000003 pos: 4 DELIMITER ; # End of log file ROLLBACK /* added by mysqlbinlog */; /*!50003 SET COMPLETION_TYPE=@OLD_COMPLETION_TYPE*/; We're running a master-master replication setup with the problematic server running mysql 5.1.61. The other server which is, for the moment, stable is running 5.1.58. Has anyone got any ideas what the solution is to this and moreover, what might have caused this?

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• One nginx rules for lots of subdomain

  - by komase

  I have lots of subdomain in a server. Every subdomain has its own Drupal boost rules, like in below codes: server { server_name subdomain1.website.com; location / { root /var/www/html/subdomain/subdomain1.website.com; index index.php; set $boost ""; set $boost_query "_"; if ( $request_method = GET ) { set $boost G; } if ($http_cookie !~ "DRUPAL_UID") { set $boost "${boost}D"; } if ($query_string = "") { set $boost "${boost}Q"; } if ( -f $document_root/cache/normal/$host$request_uri$boost_query.html ) { set $boost "${boost}F"; } if ($boost = GDQF){ rewrite ^.*$ /cache/normal/$host/$request_uri$boost_query.html break; } if (!-e $request_filename) { rewrite ^/(.*)$ /index.php?q=$1 last; break; } } location ~ \.php$ { fastcgi_pass 127.0.0.1:9000; fastcgi_index index.php; fastcgi_param SCRIPT_FILENAME /var/www/html/subdomain/subdomain1.website.com$fastcgi_script_name; include fastcgi_params; } } I adding all subdomain rules manually from time to time. The size of ngin.conf has become too big. So, I need one nginx rules which do: subdomain1.website.com pointing to /var/www/html/subdomain/subdomain1.website.com subdomain2.website.com pointing to /var/www/html/subdomain/subdomain2.website.com subdomain3.website.com pointing to /var/www/html/subdomain/subdomain3.website.com ...and so on (So that no more adding rules for subdomain .website.com I need in the future.)

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• Windows Image Backup - renamed folder now restore cannot find any backups

  - by Schneider

  A while back I decide to create a couple of Windows Image Backups of my workstation at various points during installation from clean. While doing this I decided to rename the folders containing the VHDs from 'Backup <Date>' to something else of my choosing. I didn't bother testing at the time that the restore still worked. Now I come to use these backups for doing a bare metal restore to a different computer. The problem is restore cannot 'see' any of the backups. So I have deduced that maybe I need to rename them back to the 'Backup <Date>' pattern unfortunately I cannot determine the exact values that would have originally been used here. I have tried by best guest but the images still cannot be found. I have tried doing both a network and a usb hdd restore. No luck on either. P.S. I know I can retrieve files from within the VHDs, the problem is I am trying to save myself time of reinstalling lots of big applications... not trying to recover data.

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