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• Libvirt / QEmu Machine Fails and Refuses Restart Because of Memory Allocation Errors

  - by Elmar Weber

  I'm having a problem with libvirt. On a system restart all virtual machines (VMs) are started without a problem and keep running. Then at some point in time a set of machines shuts down according to their log. When I try to restart the machine, I'm getting an error that the memory allocation failed, although more than enough memory is free. server ~ # free total used free shared buffers cached Mem: 16176648 16025476 151172 0 285432 950300 -/+ buffers/cache: 14789744 1386904 Swap: 0 0 0 server ~ # virsh start zimbra error: Failed to start domain zimbra error: Unable to read from monitor: Connection reset by peer server ~ # tail -n 4 /var/log/libvirt/qemu/zimbra.log LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/usr/bin:/usr/sbin:/sbin:/bin QEMU_AUDIO_DRV=none /usr/bin/kvm -S -M pc-0.12 -enable-kvm -m 3072 -smp 2,sockets=2,cores=1,threads=1 -name zimbra -uuid d05ddb7a-83c4-a77b-d8bc-a322648520cf -nodefconfig -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/zimbra.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown -drive file=/var/lib/libvirt/images/zimbra.img,if=none,id=drive-ide0-0-0,format=raw -device ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0,bootindex=1 -netdev tap,fd=19,id=hostnet0 -device rtl8139,netdev=hostnet0,id=net0,mac=52:54:00:21:a9:ad,bus=pci.0,addr=0x3 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 -usb -vnc 192.168.1.2:25 -k de -vga cirrus -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x4 char device redirected to /dev/pts/2 Failed to allocate 3221225472 B: Cannot allocate memory 2012-07-06 08:42:56.076+0000: shutting down server ~ # uname -a Linux server 3.2.0-26-generic #41-Ubuntu SMP Thu Jun 14 17:49:24 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux The system is a Ubuntu 12.04 server. The problem seems to occurs since the last restart, which was due to a number of package upgrades and a kernel upgrade. I tried booting with the previous kernel, the problem persists. I was not able to pinpoint an exact event when the machines fail, they do it at nearly the same time. The last time a duplicity job was running, this was not always the case however. Any suggestions on how to debug this? Best regards, elm

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• How to forever disable driver signature enforcement in Windows 8

  - by IneedHelp

  Is there a way to forever disable driver signature enforcement in Windows 8? I keep seeing this solution posted on various blogs and forums: bcdedit -set loadoptions DISABLE_INTEGRITY_CHECKS bcdedit -set TESTSIGNING ON but it is not working, at least not like when you manually disable driver signature enforcement. To disable driver signature enforcement, I currently have to do this everytime I restart my PC: 1. From the Metro Start Screen, open Settings (move your mouse to the bottom-right-corner of the screen and wait for the pop-out bar to appear, then click the Gear icon). 2. Click ‘More PC Settings’. 3. Click ‘General’. 4. Scroll down, and click ‘Restart now’ under ‘Advanced startup’. 5. Click ‘Troubleshoot’. 6. Click ‘Advanced Options’ 7. Click ‘Windows Startup Settings’ 8. Click Restart. Is there at least a way to create a shortcut or something? F8, Shift+F8 don't work any more at boot. These MS developers freaks really want everything their way only. What's worse is that when I have to power up my PC, I first have to start normally and then restart with driver signature enforcement disabled, because there is no way to tell Windows 8 to show the troubleshoot screen when a PC is powered up.

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• How to convert a raw disk image to a copy-on-write image based on another image for use with kvm and

  - by Jean-Paul Calderone

  I have a virtual Windows machine running on kvm. Presently it has a 90GB raw disk image. I would like to clone this VM without having to keep two copies of the 90GB raw disk image around. It seems like a good approach for doing this is to make two new qcow or qcow2 images based on the original. First I converted the raw image to a qcow2 image: qemu-img convert -O qcow2 basewindowsxp.img basewindowsxp.qcow2 Then I tried creating a new image backed by this: qemu-img create -F qcow2 -f qcow2 -b `pwd`/basewindowsxp.qcow2 windowsxp-1.qcow2 Then I used virt-manager to point the original VM at windowsxp-1.qcow2. However, when I try to start up the VM in this new configuration, virt-manager reports an error: Traceback (most recent call last): File "/usr/share/virt-manager/virtManager/engine.py", line 588, in run_domain vm.startup() File "/usr/share/virt-manager/virtManager/domain.py", line 150, in startup self._backend.create() File "/usr/lib/python2.6/dist-packages/libvirt.py", line 300, in create if ret == -1: raise libvirtError ('virDomainCreate() failed', dom=self) libvirtError: internal error unable to start guest: qemu: could not open disk image /var/lib/libvirt/images/windowsxp-1.qcow2 The error suggests that the filename was misspecified or that the filesystem permissions are too restrictive, but neither of these is the case: $ ls -l /var/lib/libvirt/images/windowsxp-1.qcow2 -rwxrwxrwx 1 root root 262144 2010-05-27 08:32 /var/lib/libvirt/images/windowsxp-1.qcow2 Why won't virt-manager start this vm?

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• switching dns server providers

  - by Yoav Aner

  I'm trying to wrap my head around something that I thought I kinda understood, but clearly there's some piece missing. We're currently using Zerigo as our primary dns, with slave dns running on linode. This works quite well. However, recent DDOS attacks on zerigo meant that whilst dns queries were still resolved, we were unable to make any dns changes. Since we rely on dns changes on our own infrastructure, I'm looking to improve this somehow. I'd rather not ditch zerigo completely, and realise that this or similar problems can happen with ANY primary dns hosting provider. It might not be DDOS, but a bug on their server, or something that means we can no longer issue updates. For this I want to have some fallback option: a completely independent (primary) dns provider (maybe AWS), which we will keep in-sync manually. We will switch-over to it when there's a problem. This brings me to my question: How do I make sure we can switch those providers quickly enough? specifically, on our registrar, there's a list of name servers, but no settings like TTL etc. How do dns clients know to use the newly updated name server records? Is this configured in the SOA? However, the SOA itself is hosted with the dns provider and we might not be able to update it... This is not a question about a one-time move, which can be planned and scheduled and tested, but rather to be able to do so when things are half-broken.

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• Dell XPS 17 Laptop USB SS Ports don't work until machine rebooted

  - by Matt

  I have a new Dell XPS 17 laptop and have an issue that the two USB SS ports on the rear of the machine are not recognising anything when I start-up. Have tried mouse, keyboard, headset, USB display. If I plug a USB hub in the power light on the hub lights (presume this is hard-wired) but a mouse plugged into the hub does not light up. If I restart the pc the ports work fine. Also the other two USB ports work fine all the time. I have switched off the power saving setting on the device manager (Power managementAllow the computer to turn off this device to save power) and also in the advanced power settings (USB Settings USB Selective suspend setting:disabled) I have also disabled USB powershare in the BIOS (not sure what this actually does!) This is becoming very annoying having to restart the machine every day before I can start work Running Win 7 Pro x64 EDIT: I have found that setting USB Emulation to Disabled has helped the devices to be recognised during start up but they keep dropping out completely when in use EDIT 2: I contacted Dell about this issue who told me to update the BIOS driver, when I asked if I should downgrade from the factory installed A13 to the A12 posted on the dell website they said no. However there is now an A14 available on the website has anyone tried this?

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• Removing forward lookup zone broke our site - why?

  - by user102469

  I'm fairly new to the job and trying to get to grips with the infrastructure here. We've moved a site from being locally hosted on our own network to an external host (1&1). I've transferred the DNS hosting from the previous DNS host to 1&1 to keep things simple. Once everything had gone through, visitors that were external to our network were being directed to the new site on 1&1 but requests from within our network were still going to our own server. I noticed in the DNS server that there was a forward lookup zone for the site pointing to our own server still. My (admittedly simplistic) understanding was that pausing that zone would then cause the DNS server to get the address for the site from our external DNS servers and our users would start landing on our new site. However, what happened instead was that they were being met with "page not found" type errors. I've resolved it my modifying the forward lookup zone A record to point to the external web server but would like to get an understanding as to why pausing the zone didn't work. Would deleting the zone work? I am reluctant to try that as creating it again will not be as easy as simply pressing "start". Many thanks.

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• Home media storage solution

  - by Dan

  I record lots of personal HD film footage and am looking for a cheap way to store all of this. I take ~120 GB of footage each month, so something expandable would be nice... something that might be able to hold 6+ SATA drives. There is a low load requirement, as there is never more than a user or two... but it should be able to keep up with streaming 2 simultanious HD videos. I don't really want to spend more than $200-$300 on top of the $900 I am thinking of spending for 6X2GB SATA drives@ $150 apiece, but I am willing to pay extra for a quality solution. Should I get a cheap NAS server? a cheap multi-drive external enclosure? should I just get some used systems off craigslist? If it is an independent system I'll probably just throw ubuntu on it since I can maintain that well. Its easy to do a software raid from ubuntu too, if I choose to go that way. Thanks

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• Using gentoo, how does one stick -9999 ebuild to a specific svn revision?

  - by hurikhan77

  As an example given the django-9999 ebuild, to match the developers environment I need to checkout R12120 from trunk. Installing Django manually is not option due to package management reasons. But there is also no ebuild in portage for 1.2 beta versions. So I did the following: ESVN_OPTIONS="-r12120" emerge -1a django Which installed the required revision from svn. But this is cumbersome in a way. Is there some way to define this statically per ebuild, eg something like: DJANGO_SVN_REV="12120" in make.conf. This would be much cleaner in my eyes. Because next time I need to rebuild django for whatever reason, I need to remember: "Oh I wanted this to stick to a specific revision" and next question will be "err, f&!#$?%, what was it again?" What's the best way to go here? Keep in mind: Manually installing packages without package manager knowledge is no option Working around with manual emerge variable prefixing is no option Setting up a /etc/portage/package.env would be a way to go (as described here) but that seems pretty unsupported and kludgy to me and thus unpreferable Modifying make.conf would be a way to go Keeping the ebuild in an overlay would be an option

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• jdbc4 CommunicationsException

  - by letronje

  I have a machine running a java app talking to a mysql instance running on the same instance. the app uses jdbc4 drivers from mysql. I keep getting com.mysql.jdbc.exceptions.jdbc4.CommunicationsException at random times. Here is the whole message. Could not open JDBC Connection for transaction; nested exception is com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: The last packet successfully received from the server was25899 milliseconds ago.The last packet sent successfully to the server was 25899 milliseconds ago, which is longer than the server configured value of 'wait_timeout'. You should consider either expiring and/or testing connection validity before use in your application, increasing the server configured values for client timeouts, or using the Connector/J connection property 'autoReconnect=true' to avoid this problem. For mysql, the value of global 'wait_timeout' and 'interactive_timeout' is set to 3600 seconds and 'connect_timeout' is set to 60 secs. the wait timeout value is much higher than the 26 secs(25899 msecs). mentioned in the exception trace. I use dbcp for connection pooling and here is spring bean config for the datasource. <bean id="dataSource" destroy-method="close" class="org.apache.commons.dbcp.BasicDataSource" > <property name="driverClassName" value="com.mysql.jdbc.Driver"/> <property name="url" value="jdbc:mysql://localhost:3306/db"/> <property name="username" value="xxx"/> <property name="password" value="xxx" /> <property name="poolPreparedStatements" value="false" /> <property name="maxActive" value="3" /> <property name="maxIdle" value="3" /> </bean> Any idea why this could be happening? Will using c3p0 solve the problem ?

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• Cisco ASA 8.2 ACL For NAT

  - by javano

  Sadly I have gone back in time to ASA 8.2(5)33 which I am not so familiar with. I have configured NAT between two interfaces but traffic isn't passing becasue I can't get the ACL to work; (The full config which isn't very big is here but to keep this post tidy I have just pasted the important parts below); interface Ethernet0/0 switchport access vlan 108 ! interface Ethernet0/6 switchport access vlan 104 ! interface Ethernet0/7 switchport access vlan 105 ! interface Vlan104 description BUILDING2 nameif BUILDING2 security-level 0 ip address 10.104.0.1 255.255.255.0 ! interface Vlan105 description BUILDING1 nameif BUILDING1 security-level 0 ip address 10.105.0.1 255.255.255.0 ! interface Vlan108 description Main LAN VLAN nameif lan security-level 0 ip address 172.22.0.215 255.255.255.0 ! object-group network obj_net_Remote_Hosts network-object host 111.111.111.3 network-object host 111.111.111.65 object-group network obj_host_pc1_eth1 network-object host 10.104.0.111 object-group network obj_host_pc2_eth1 network-object host 10.104.0.112 object-group network obj_host_pc3_eth1 network-object host 10.104.0.106 object-group network obj_host_pc4_eth1 network-object host 10.104.0.107 object-group network obj_net_PCs description IPs of PCs group-object obj_host_pc1_eth1 group-object obj_host_pc2_eth1 group-object obj_host_pc3_eth1 group-object obj_host_pc4_eth1 access-list acl_NAT_pc1_91 extended permit tcp host 10.104.0.111 host 111.111.111.3 eq 8101 access-list acl_Permit_PCs extended permit tcp object-group obj_net_PCs object-group obj_net_Remote_Hosts eq 8101 ! global (BUILDING1) 11 111.111.222.91 netmask 255.255.255.255 nat (BUILDING2) 11 access-list acl_NAT_pc1_91 access-group acl_Permit_PCs in interface BUILDING2 route BUILDING1 111.111.111.3 255.255.255.255 10.105.0.2 1 route BUILDING1 111.111.111.65 255.255.255.255 10.105.0.2 1 When I try and connect from PC1 to ip 111.111.111.3 I see the following error logged on the ASA console; %ASA-2-106001: Inbound TCP connection denied from 10.104.0.111/38495 to 111.111.111.3/8101 flags SYN on interface blades What the duce!

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• How to make network drives appear even if disconnected?

  - by Jake

  I have the same problem as many others: network and home drives set by group policy and AD are not connected on windows startup. The prime suspect is that the LAN or wireless does not connect until after user log in. I have already given up on that. Now, I just want the disconnected drives to continue to list in My Computer so that if the user goes in and double click the drive, it will connect again. However, on some machines the drive is completely missing from My Computer. If I right click My Computer Map Network Drive again, it does work. But it's very troublesome to do it all the time. And I don't want to use a script to map the drives because I don't want to appear to be using a hacky solution to the users. The drives listed as disconnected will look more like a "built-in feature", and gives users more confidence. How can I keep the disconnected drives in My Computer? I am using Windows 7 Professional and Win2k8.

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• Redmine plug-in fails at rake db:migrate_plugins

  - by Drew

  Hey, First post, so hope I'm in the right place. While trying to install the Redmine plug-in 'Wiki Extensions', I keep getting stuck when I try to run the "rake db:migrate_plugins RAILS_ENV=production" command. I am moving server and I'm in bit over my head. Haven't found anything on Google that has helped me much, though I might have missed something. I have pasted in the output with --trace: (in /srv/www/vastpark.org/redmine) ** Invoke db:migrate_plugins (first_time) ** Invoke environment (first_time) ** Execute environment ** Execute db:migrate_plugins Migrating engines... Migrating acts_as_activity_provider... Migrating acts_as_attachable... Migrating acts_as_customizable... Migrating acts_as_event... Migrating acts_as_list... Migrating acts_as_searchable... Migrating acts_as_tree... Migrating acts_as_versioned... Migrating acts_as_watchable... Migrating awesome_nested_set... Migrating classic_pagination... Migrating coderay-0.9.2... Migrating gravatar... Migrating open_id_authentication... Migrating prepend_engine_views... Migrating redmine_wiki_extensions... == CreateWikiExtensionsComments: migrating =================================== -- create_table(:wiki_extensions_comments) rake aborted! An error has occurred, all later migrations canceled: Mysql::Error: Table 'wiki_extensions_comments' already exists: CREATE TABLE 'wiki_extensions_comments' ('id' int(11) DEFAULT NULL auto_increment PRIMARY KEY, 'wiki_page_id' int(11), 'key_word' varchar(255), 'user_id' int(11), 'comment' text, 'created_at' datetime, 'updated_at' datetime) ENGINE=InnoDB

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• Starting my own server - basic recommendations and questions [closed]

  - by Ilia Rostovtsev

  Possible Duplicate: Can you help me with my capacity planning? I'm planning to start my own high-performance server and then use collocation services for keeping it up and running. I'm planning to USE it for processing videos and keeping big video site up! (using FFMpeg, MENcoder and etc.) I just need recommendations on whether listed hardware is good enough and will work together well and fast enough. Do I need anything else (missed something). I remember about CPU coolers though! ;) I'm planning to use SSD drives so please tell me if it's going to work just as regular HDDs (but much faster)? Are they going to be used as RAID (is this possible for SSDs)? Here is what I would like to get: Intel ® Server System SR1600URHSR (Urbanna) or Intel® Server System SR1695WBAC 2 x Intel Xeon X5650 4 x 16Gb DDR-III 1333MHz Kingston ECC Reg (KVR13R9D4/16) 3 x (or maybe 4x) 480Gb SSD Intel 520 Series (SSDSC2CW480A3K5) Which server system would be better? Is listed hardware new/good enough and worth buying it at the moment? Should I probably take a look at something slightly more expensive but more up to date and powerful, may be? After all as software I would like to use CentOS 6 64 bit + WHM/CPanel? Any other suggestions on maybe cheaper and same/more powerful server management system but WHM? What most important points to keep in mind when starting/maintaining your own server?

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• CNAME redirect to Wordpress blog not working (.htaccess problem)

  - by Vincent Chan

  I have two domains hosting in two different servers: domain1.com & domain2.com I would like to forward "blog.domain1.com" to "blog2.domain2.com" which is a Wordpress blog using CNAME redirect. Before I installed Wordpress. blog.domain1.com (=redirect=) blog2.domain2.com/index.htm (working fine) The browser will keep the URL (http://blog.domain1.com) even the index.htm is on domain2.com server. However, after I installed Wordpress, the browser will change the URL to (http://blog2.domain2.com) This is my current setup: On domain1.com DNS: blog.domain1.com CNAME redirect to domain2.com on domain2.com .htaccess: Options +FollowSymLinks RewriteEngine On RewriteCond %{HTTP_HOST} ^blog\.domain1\.com RewriteRule ^(.*)$ http://blog2.domain2.com/$1 [R=301,L] on blog2.domain2.com .htaccess: DirectoryIndex index.php <IfModule mod_rewrite.c> Options +FollowSymLinks RewriteEngine On RewriteBase /blog2/ RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule . /blog2/index.php [L] </IfModule> blog2.domain2.com is installed under domain2.com/blog2/ All I want to do is keeping the URL (blog.domain1.com) unchanged for the whole Wordpress redirect. Thanks a lot.

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• Better approach to archiving large amounts of original video footage using optical media (DVD/Blu-ra

  - by Rob

  This question is to share my experience as well as ask for suggestions for better methods. Along with 2 friends, I completed the making of a short documentary film in 2006. Clip is at: http://www.youtube.com/mediamotioninvision The film was edited in Adobe Premiere Pro 1.5 on Windows XP. More details and screenshot here: http://www.flickr.com/photos/smilingrobbie/1350235514/ ( note this is not intended to be a plug, we've moved on from this initial learning curve project ;) ) The film is in 4:3 standard definition 720x576 PAL format. As well as retaining the final 30minute film, I wanted to keep all original files that assembled together to make the film. The footage was 83.5Gb So I archived them to over 20 4.7Gb DVD recordables in the original .avi format (i.e. data DVD-ROM format, NOT DVD-Video Mpeg2) Some .avi DV video files were larger than 4.7Gb so I used 7-zip to split them ( here is a guide as to how to do that: http://www.linglom.com/2008/10/12/how-to-split-a-large-file-using-7-zip/ ) To recombine them, a dos shell command like this would do that: copy /b file.avi.* file.avi would do the job, where .* is a wild card to include all the split parts e.g. 001, 002...00n assuming they are all in the same directory path folder. file.avi is the recombined file identical to the original. Later on, I bought a LG BE06 LU10 USB 2.0 Super-multi Blu-ray burner and archived the footage to 2 (two) x 50Gb BD-R DL discs. Again in the original format, written as files to a BD-R in the BD-R BD-ROM UDF format readable by PC/Mac etc, NOT Blu-ray video/film format. This seems to be a good solution for me, because: the archive is in a robust, reasonably permanent, non-volatile medium, i.e. DVD recordable / Blu-ray (debates about stability of optical media organic chemical dye compounds/substrates aside) the format of the archive is accessible by open source tools or just plain Windows Explorer and it's not in a proprietary format I just thought I'd ask folks for their experience on better methods, if such exist.

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• how do you install php-devel

  - by user962449

  I keep getting dependency issues when I try to run yum install php-devel yum install --skip-broken php-devel .... --> Finished Dependency Resolution php-5.1.6-32.el5.i386 from base has depsolving problems --> Missing Dependency: php-common = 5.1.6-32.el5 is needed by package php-5.1.6-32.el5.i386 (base) php-cli-5.1.6-32.el5.i386 from base has depsolving problems --> Missing Dependency: php-common = 5.1.6-32.el5 is needed by package php-cli-5.1.6-32.el5.i386 (base) --> Running transaction check ---> Package php.i386 0:5.1.6-32.el5 set to be updated --> Processing Dependency: php = 5.1.6-32.el5 for package: php-devel ---> Package php-cli.i386 0:5.1.6-32.el5 set to be updated --> Finished Dependency Resolution php-devel-5.1.6-32.el5.i386 from base has depsolving problems --> Missing Dependency: php = 5.1.6-32.el5 is needed by package php-devel-5.1.6-32.el5.i386 (base) Packages skipped because of dependency problems: autoconf-2.59-12.noarch from base automake-1.9.6-2.3.el5.noarch from base imake-1.0.2-3.i386 from base php-5.1.6-32.el5.i386 from base php-cli-5.1.6-32.el5.i386 from base php-devel-5.1.6-32.el5.i386 from base Any ideas?

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• How would I setup iMail to forward a user's mail to another service w/o leaving a copy locally?

  - by Scott Mayfield

  I have an iMail 2006 server installation in which I have a particular user that has several aliases that all point to a single user (me, for the record). I've been copying all of my mail to GMail and reading it there, but it annoys me that I have to go back weekly and log into my mail account on iMail and delete between 6 and 10 thousand copies of messages I've already received, in order to keep my mailbox from filling up (yes, I have it set with no quota, but I consider it bad form to just let the box grow indefinitely). I've got the copying setup via an inbound user rule, but I'm wondering how to accomplish a "copy and delete" rule. The manual isn't clear on what happens with multiple matching rules (will they be processed in order, or is it a first match situation?) and there isn't a means to combine multiple actions into a single rule. If I use the "forward" action, I THINK that it's going to screw up all the sender information once the mail reaches my GMail account and show it as coming from me instead of the original senders (can anyone confirm that this is accurate?) An easy answer would be to delete my user account entirely, replace it with an alias that maps to my GMail account, but then I would lose my ability to log into the system for admin duties. So that leads me to creating a second, lesser known account for admin use, but since it's a real account, sooner or later I'm going to get mail sent to it and I'll be back to the same situation of having a user account that doesn't get emptied periodically. I imagine I can set the quota to 0 MB to cause all incoming mail to my admin account to bounce, or setup an inbound rule to bounce everything, but this is starting to sound kludgy to me. Does anyone know of a more direct work around to copying a user's incoming mail to an outside server and then deleting the local copy w/o removing their account entirely? Or is this just wishful thinking?

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• Translating IPTables rule to UFW

  - by Dario Fumagalli

  we are using an Ubuntu 12.04 x64 LTS VPS. Firewall being used is UFW. I have setup a Varnish + LEMP setup. along with other things, including an Openswan IPSEC VPN from our office to the VPS data center. A second in house Ubuntu box is to act as MySQL slave and fetch data from the VPS through the VPN. Master's ppp0 is seen as 10.1.2.1 from the slave, they ping etc. I have done the various required tasks but I can't get the client (slave) MySQL (nor telnet 10.1.2.1 3306) to access the master through the VPN unless I issue this fairly obvious IPTables command: iptables -A INPUT -s 10.1.2.0/24 -p tcp --dport 3306 -j ACCEPT I willingly forced the accepted input to come from the last octet. With this rule everything works just fine! However I want to translate this command to UFW syntax so to keep everything in one place. Now I admit being inexperienced with UFW, I prepared rules like: ufw allow proto tcp from 10.1.2.0/24 port mysql and 2-3 variations involving specifying 3306 instead of mysql, specifying a target IP (MySQL's my.cnf at the moment is configured as 0.0.0.0) and similar but I just don't seem to be able to replicate the simple iptables rule in a functional way. Anyone could kindly give me a suggestion that is not to dump UFW? Thanks in advance.

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• Blu-ray BD-R: Would you physically store it in a CaseLogic Wallet pocket?

  - by Rob

  I keep several backup copies of my material and files. For my DVDs, one set of copies is kept in a CaseLogic wallet folder pack, so that I can easily move this around when visiting friends, family or for business. This is highly convenient. The other sets are kept in their jewel cases in hard plastic see thru storage boxes. Although CaseLogic wallet material is designed to be abrasion free, their caveat is that external dust will be the cause of any blemishes. If hard dust gets in these pockets, which is inevitable, this will occasionally cause light hair like scratches on the disc surface as the discs are removed and returned for access to their contents. This is of no consequence as the laser and error correction can more than cope with this. I'm aware that the blu-ray spec requires anti-scratch in disc surfaces but was wondering that, given the smaller pits, would dust and light scratches from wallet storage cause more problems with blu-rays than they would with DVDs? I'm using Blu-ray BD-R and BD-R DL write once media.

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• Redis as substitution for Memcache

  - by Boban P.

  We have distributed web app, and for now, as session handler, we use two separate instances of memcache in redundancy, so everything that is written in one memcache is also written in other. Memcache is fairly easy to install, use, and maintain but we have one problem: if one memcache fail, everything is fine, php comunicate with other instance which has all data (although, half of connections have a delay because they try to use failed one, wait a little, and then contact other memcache). When failed instance comes back to life again, it starts up empty. If established session request data from that instance, session fails, and user logs out, and that happens to half of users.So, we are thinking about to switch to redis for session handling, and maybe keep memcache for cache only. My questions are: If we setup redis instances as master-slave, and if master fails, can sentinel promote slave as new master and when old master comes back to life, will it stay as slave or not? Is redis call malloc at startup to allocate part of memory, like memcache or varnish, or it calls malloc for every key inserted? And what are pros and cons of that?

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• Estimating compressed file size using a list parameter

  - by Sai

  I am currently compressing a list of files from a directory in the following format: tar -cvjf test_1.tar.gz -T test_1.lst --no-recursion The above command will compress only those files mentioned in the list. I am doing this because this list is generated such that it fits a DVD. However, during compression the compression rate decreases the estimated file size and there is abundant space left in the DVD. This is something like a Knapsack algorithm. I would like to estimate the compressed file size and add some more files to the list. I found that it is possible to estimate file size using the following command: tar -cjf - Folder/ | wc -c This command does not take a list parameter. Is there a way to estimate compressed file size? I am also looking into options like perl scripts etc. Edit: I think I should provide more information since I have been doing a lot of web search. I came across a perl script(Link)that sort of emulates the Knapsack algorithm. The current problem with the above mentioned script is that it splits the files in their original state. When I compress the files after splitting them, there are opportunities for adding more files which I consider to be inefficient. There are 2 ways I could resolve the inefficiency: a) Compress individual files and save them in a directory using a script. The compressed file could provide a best estimate. I could generate a script using a folder of compressed files and use them on the uncompressed ones. b) Check whether the compressed file's size is less than the required size. If so, I should keep adding files until I meet the requirement. However, the addition of new files to the compressed file is an optimization problem by itself.

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• "Safely remove hardware"...doesn't.

  - by Kev

  I have an external USB harddisk that I have scripted to safely shut down after a backup, so the backup operator can unplug it, and knows not to if the lights are still on for some reason. It's always worked fine using the DevEject command-line utility. This week it failed for some reason: DevEject 1.0 2003 c't/Matthias Withopf Ejecting 'USB Mass Storage Device' [USB\VID_0411&PID_002A\00000704C8D2]...FAILED (23,5) Error ejecting device USB Mass Storage Device, vetoed (15,5)! Worse yet, using the SRH tray icon, I click Stop, click OK, it pauses about 5 seconds with OK and Cancel greyed out, closes the sub-window, and then the main window with the Stop button still shows the device, and Stop is still available. I can keep doing that and it never gets rid of the device. I can still access it in Explorer. LockHunter reports that nothing is locking the drive. I've made no changes to the backup configuration or anything to do with the drive this week. Why the sudden flake-out? Short of a restart, which I can't do today before the backup operator goes home, how do I fix it?

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• How would I setup iMail to forward a user's mail to another service w/o leaving a copy locally?

  - by Scott Mayfield

  I have an iMail 2006 server installation in which I have a particular user that has several aliases that all point to a single user (me, for the record). I've been copying all of my mail to GMail and reading it there, but it annoys me that I have to go back weekly and log into my mail account on iMail and delete between 6 and 10 thousand copies of messages I've already received, in order to keep my mailbox from filling up (yes, I have it set with no quota, but I consider it bad form to just let the box grow indefinitely). I've got the copying setup via an inbound user rule, but I'm wondering how to accomplish a "copy and delete" rule. The manual isn't clear on what happens with multiple matching rules (will they be processed in order, or is it a first match situation?) and there isn't a means to combine multiple actions into a single rule. If I use the "forward" action, I THINK that it's going to screw up all the sender information once the mail reaches my GMail account and show it as coming from me instead of the original senders (can anyone confirm that this is accurate?) An easy answer would be to delete my user account entirely, replace it with an alias that maps to my GMail account, but then I would lose my ability to log into the system for admin duties. So that leads me to creating a second, lesser known account for admin use, but since it's a real account, sooner or later I'm going to get mail sent to it and I'll be back to the same situation of having a user account that doesn't get emptied periodically. I imagine I can set the quota to 0 MB to cause all incoming mail to my admin account to bounce, or setup an inbound rule to bounce everything, but this is starting to sound kludgy to me. Does anyone know of a more direct work around to copying a user's incoming mail to an outside server and then deleting the local copy w/o removing their account entirely? Or is this just wishful thinking? Thanks in advance. Scott

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• Windows Key is shutting my PC with Windows 7 down when pressed

  - by jasondavis

  I am having a really annoying problem lately with my Windows 7 PC. The problem, is all of a sudden, just within the last day or 2, anytime I hit the WIN (Windows keyboard key) instead of popping up the start menu, the system shuts down all my programs and trys to shut down, the only reason it doesn't suceed is because one of the programs I will have running will have an un-saved document, so it will ask me if I want to save the document before shutting down, I then can hit cancel and it halts the process. I do not remember installing anything and programs from from around the time it started doing this, maybe 2-3 days ago. I have gone through and searched Google for every Process running in the taskmanager to see which processes were REQUIRED for Windows to run, I then closed eveything down and killed all the non-essential Processes and the result was this... The reason you see notepad.exe is because I had it open with an unsaved document to keep the system from shutting down, I then tried hitting the win key after I shut each process down, after everything was shut to just show the above, it still tries to shut my system down, this is driving me insane, please help I am at a lost. I am about to see if I can try a different keyboard just encase it is some malfunction on the keyboard. The reason I need to access the WIN key or would like to is because I have Win + v set up to work with a special clipboard manager I believe it is called ClipX

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• MySQL Server hitting 100% unexpectedly (Amazon AWS RDS)

  - by Luc

  Please help! We've been struggling with this one for months. This week we upped our RDS instance to the highest performing instance and although the occurrences have reduced, we're still having our DB all of a sudden hit 100%. It comes out of nowhere. Sometimes 2am, sometimes midday. I've ruled out a DOS - our pages access logs have normal traffic I've ruled out memcached suddenly dieing (hits and misses continue as normal). The SHOW PROCESSLIST while we have issues reports about 500 queries in queue. If I kill them off or restart the server, they just keep coming back and then eventually out of knowhere, our server resumes back to normal. Sometimes up to 3 hours. Our bad performing queries take .02 seconds to execute when the server eventually returns back to normal but while we're in this 100% CPU physco phase, those queries never finish executing. Please help!!!!! Anybody know anything about MYSQL query optimization? Could it be the server deciding to use different indexes all of a sudden, which puts it into a spiral?

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