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Monitoring host and app parameters in real-time

- by devopsdude42

I have a bunch of VMs that I need to monitor in real-time. For all nodes I need to watch host parameters like load, network usage and free memory; and for some I need app-specific metrics too, like redis (some vars from the output of INFO command) and nginx (like requests/sec, avg. request time). Ideally I'd also like to track some parameters from the custom apps that run on these node too. These parameters should get tracked as a bunch of line charts on a dashboard. I checked out graphite and it looks suitable (although the UX and aesthetics looks like it needs some love). But setting up and maintaining graphite looks to be a pain, esp. since we don't have a full-time person just for this. Are there any alternatives? Or at least something that is simpler to setup and will scale? Reasonable paid services are also ok.

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Strategy for hosting 700+ domains names, each with a static HTML site

- by jonschlinkert

I have a portfolio of more than 700 domain names, and ideally I'd like to put up a single-page HTML/CSS/JavaScript webpage for each domain. Is there a system/strategy/workflow that will allow me to: Automate the deployment of new websites, quickly and easily without having to manually initiate each new website in an admin panel. For instance, I've seen dropbox-based solutions that claim to make it simple to setup new websites on your dropbox account, but you still have to set each one up in an admin interface first. It would be so much easier to have a folder naming convention that allowed the user to easily clone/copy/duplicate sites inside their Dropbox App folder (https://www.dropbox.com/developers/blog/23) to create new ones. Sounds interesting, however... It's easy to manage CNAMEs on the registrar-side, but is there a way to quickly associate CNAMEs with new websites (on the hosting side), maybe using the method offered by gh-pages-style (https://help.github.com/articles/setting-up-a-custom-domain-with-pages)? With GitHub's gh-pages, all you have to do is drop a file called CNAME into your repo, with the domain name you want associated with the repo inside the file. gh-pages isn't a good solution for what I'm doing though unfortunately. I'm also a front-end developer, specializing in rapid web development and "front-end build systems", so I building and maintaining static assets for hundreds of sites is no problem. It's the hosting-side that I really struggle with. Any suggestions?

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Diskless with Ubuntu 12.04

- by user139462

I'm trying to setup a new diskless solution with ubuntu 12.04 without any success. I followed this howto: https://help.ubuntu.com/community/DisklessUbuntuHowto But the initramfs seems not to be able to mount my nfs share. On my server side: My /etc/exports /srv/nfs4 192.168.0.0/24(fsid=0,rw,no_subtree_check) /srv/nfs4/nfsroot 192.168.0.0/24(rw,no_root_squash,no_subtree_check,fsid=1,nohide,insecure,sync) I'm able to mount my nfs share on standard Ubuntu installation without any problem. I can mount my nfs on any client with those commands: mount 192.168.0.3:/nfsroot /mnt or mount 192.168.0.3:/srv/nfs4/nfsroot /mnt My /tftpboot/pxelinux.cfg/default config file is DEFAULT vmlinuz-3.5.0-25-generic root=/dev/nfs initrd=initrd.img-3.5.0-25-generic nfsroot=192.168.0.3:/nfsroot ip=dhcp rw I also tried DEFAULT vmlinuz-3.5.0-25-generic root=/dev/nfs initrd=initrd.img-3.5.0-25-generic nfsroot=192.168.0.3:/srv/nfs4/nfsroot ip=dhcp rw. What I got in initramfs: With the setting [nfsroot=192.168.0.3:/nfsroot] Diskless output: mount call failed - server replied: Permission denied On Syslog of my nfs server: rpc.mountd[1266]: refused mount request from 192.168.0.10 for /nfsroot (/): not exported With the setting [nfsroot=192.168.0.3:/srv/nfs4/nfsroot] Diskless output: mount: the kernel lacks NFS v3 support On Syslog of my nfs server I got: Mar 11 14:03:06 BootFromLan rpc.mountd[1266]: authenticated mount request from 192.168.0.10:834 for /srv/nfs4/nfsroot (/srv/nfs4/nfsroot) Mar 11 14:03:06 BootFromLan rpc.mountd[1266]: refused unmount request from 192.168.0.10 for /root (/): not exported

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Windows Server vs Sharing

- by Mark Lawrence

Not sure if this is the right place for this question. I have a friend that owns a small business running 3 local machines, that are connected to the internet, and a server that each local machine connects to. He has recently bought a newer server, and by server I mean a Windows Vista box. He wants to use this purely to store data that the 3 local machines can access, kind of like a glorified external hard drive. Im suggesting to fore-go the server option and simply setup sharing on the 'server' box. Interested in hearing any suggestions as to whether the server idea is preferable?

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SEO: Make hashtag links look static

- by elias94xx

So I have a website which displays all my content vertically. (like modern websites often do these days). Thus I can't create static links to each section. I'm currently handling the scrolling with javascript. My navigation looks like this. <ul> <li><a href="#services">Services</a></li> <li><a href="#references">References</a></li> <li><a href="#blog">Blog</a></li> <li><a href="#contact">Contact</a></li> </ul> I also created 301 redirect links with htaccess. E.g. /services which leads to /#services. If I were to use them in my navigation, I'd have to trigger the scrolling with the onpopstate event. Thats not really a problem, but would searchengines accept that kind of setup ? I also created a sitemap and submitted it to google, but the indexing is still pending.

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MediaTemple Django Bad Gateway

- by Eeyore

I have a site running on GS server on MediaTemple. It's Django/PostgreSQL setup. For some reason from time to time I get Bad Gateway error and I can't figure out what's causing it. What can cause this error? What else can I do to find the cause of the problem? url.access-deny = ( "~", ".inc" ) fastcgi.server = ( "/main.fcgi" => ( "main" => ( "socket" => "/var/tmp/" + appname + ".sock", # don't change this "check-local" => "disable", ) ) ) alias.url = ( "/media/" => "/home/xxx/data/python/django/django/contrib/admin/media/", "/static/" => "/home/xxx/containers/django/site/static/", ) url.rewrite-once = ( "^(/media.*)$" => "$1", "^(/static.*)$" => "$1", "^/favicon\.ico$" => "/media/favicon.ico", "^(/.*)$" => "/main.fcgi$1", ) server.error-handler-404 = "/main.fcgi"

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iTunes home sharing problem

- by Trev

I have two iMacs running Snow Leopard. I have iTunes home sharing setup on the two of them using the same iTunes account credentials. Up until last night all worked fine... I could download an app on one iMac, then go to the other iMac and drag that app from the home sharing into that iMac's applications. Then all of a sudden it stopped working. I can see and browse the home sharing, however, when I go to drag an app or song from the share to the local library it gives me an error stating that I am unable to do so... when I click OK to this message I lose visibility to the home share. I have checked and this iMac is authorized with my iTunes account and I have even deauthorized and reauthorized but still the same result. Does anyone have any suggestions?

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Using MongoDB + Redis + Apache on the same server in production?

- by Dayson

I intend to launch my web app using a 8 GB VPS. It uses MongoDB + Redis for storage/caching and Apache + PHP-FPM for serving requests. Could there be any issues with running Mongo + Redis + Apache on the same server? Would it make more sense to setup 2 x 4 GB VPS servers and keep Mongo on one and Redis + Apache on another? Should I just start with one server and worry about scaling horizontally later by delegating the existing server to Mongo in the future (due to its large RAM) and moving the web servers on to multiple smaller VPS'?

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Groovy JUnit test support

- by Martin Janicek

Good news everyone! I've implemented support for the Groovy JUnit tests which basically means you can finally use Groovy in the area where is so highly productive! You can create a new Groovy JUnit test in the New File/Groovy/Groovy JUnit test and it should behave in the same way as for Java tests. Which means if there is no JUnit setup in your project yet, you can choose between JUnit 3 and JUnit 4 template and with respect to your choice the project settings will be changed (in case of the Maven based projects the correct dependencies and plugins are added to the pom.xml and in case of the Ant based project the JUnit dependency is configured). Or if the project is already configured, the correct template will be used. After that the test skeleton is created and you can write your own code and of course run the tests together with the java ones. Some of you were asking for this feature and of course I don't expect it will be perfect from the beginning so I would be really glad to see some constructive feedback about what could be improved and/or redesigned ;] ..at the end I have to say that the feature is not active for the Ant based Java EE projects yet (I'm aware of it and it will be fixed to the NetBeans 7.3 final - actually it will be done in a few days/weeks, just want you to know). But it's already complete in all types of the Maven based projects and also for the Ant based J2SE projects. And as always, the daily build where you can try the feature can be downloaded right here, so don't hesitate to try it!

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Technicolor TG582n with external DHCP server [on hold]

- by Jack

We have a small home setup with a Technicolor TG582n on Plusnet ISP. We have a Samba4 DC with DNS forwarding enabled. The DC forwards to the Technicolor. However, the client machines have their DNS settings manually set. This is an annoyance when using laptops on other networks. We would like to have DHCP handled on the server machine, such that when a client connects to the Technicolor, it gets its IP and DNS information from the DHCP server, eliminating the need to manually set adapter DNS settings. However, I cannot find an option to disable DHCP on the Technicolor and am not completely clear on how one would point DHCP services to the server from the Technicolor if there were the option. So, how would one make the Technicolor use an external server for DHCP leases?

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design for supporting entities with images

- by brainydexter

I have multiple entities like Hotels, Destination Cities etc which can contain images. The way I have my system setup right now is, I think of all the images belonging to this universal set (a table in the DB contains filePaths to all the images). When I have to add an image to an entity, I see if the entity exists in this universal set of images. If it exists, attach the reference to this image, else create a new image. E.g.: class ImageEntityHibernateDAO { public void addImageToEntity(IContainImage entity, String filePath, String title, String altText) { ImageEntity image = this.getImage(filePath); if (image == null) image = new ImageEntity(filePath, title, altText); getSession().beginTransaction(); entity.getImages().add(image); getSession().getTransaction().commit(); } } My question is: Earlier I had to write this code for each entity (and each entity would have a Set collection). So, instead of re-writing the same code, I created the following interface: public interface IContainImage { Set<ImageEntity> getImages(); } Entities which have image collections also implements IContainImage interface. Now, for any entity that needs to support adding Image functionality, all I have to invoke from the DAO looks something like this: // in DestinationDAO::addImageToDestination { imageDao.addImageToEntity(destination, imageFileName, imageTitle, imageAltText); // in HotelDAO::addImageToHotel { imageDao.addImageToEntity(hotel, imageFileName, imageTitle, imageAltText); It'd be great help if someone can provide me some critique on this design ? Are there any serious flaws that I'm not seeing right away ?

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What did Emolator do with My Laptop?

- by Garry

I played SEGA with my KEGA.exe (Sega Emulator) and it made my right key to be malfunctioned. Befor that day, I had played it, too in my notebook with fullscreen mode, and suddenly my ACER Aspire One notebook restarted during that emulator was running and before the screen was black (boot), my screen was blue with many words but I couldn't read them, but I remember that there was a word like 000000 x 0000000 x 000000 and bla bla bla. And when I played without fullscreen mode, It didn't happened but it made my right key to be malfunctioned until when I went to Bot setup, my right key doesn't work. Do U know what is the problem of my emulator? Can U explain me for that?

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Need help in making my new laptop dual boot with ubuntu 9.10

- by michael

Hi, I have a new laptop which comes with window 7. I want to dual-boot it with ubuntu 9.10. I have burned the install disk of 9.10. But during the install process, I am stuck in 'setup my partition'. It has 2 options: wipe out my whole hard disk' or 'manually configure' I don't want it to wipe out my whole hard disk (i want to keep my window 7). But how can I manually configure the partition to use the free space and create a partition so that I can install ubuntu 9.10 and swap space? Thank you.

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IIS permissions issue pointing docroot to Samba share

- by lalalalalalalambda

I have an IIS project which is stored on a Samba shared, network mounted with the following line: X: \\my-samba-server\dev /user:freddie Connectivity is fine, can read/write files from X:. In IIS, I'm trying to set it as the Physical path via \\my-samba-server\dev\folder\to\my\files, which results in the following 500.19 error: Config Error | Cannot read configuration file due to insufficient permissions It is by default trying to use the Pass-through authentication. If I try to set this to connect as the specific user freddie, I receive: The specified user does not exist What is the correct way to connect to a path which has been setup as described above? *Samba man pages indicate version 3.6 is on the Debian host

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ISCSI: Ethernet cable maximum length vs. SCSI command timeout

- by Jeremy Hajek

I have a question about a non-optimal setup and the practical implications of this. Ideally you would place the ESXi server right in the same room as the FreeNas white box end of question. My situation is this: I have a run of ~125ft of Cat 5e connecting a ESXi server to a FreeNas whitebox in the server room. I know the distance of the ethernet cable is within the maximum distance for ethernet traffic but I have two questions... Can Cat 5e support gigbit speeds at that distance if the switch on the back end is a linksys SRW-2048? Should I be concerned about the distance causing data read and write timeouts in the SCSI portion--(disk operations of the ESXi)?

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How do I set "MaxPermSize" for Atlassian Fisheye/Crucible running as service on Win2k3?

- by Jeremy

I have been trying to setup Atlassian Fisheye/Crucible as a service on Win 2K3 R2 for two weeks. I keep getting various "java.lang.OutOfMemoryError: PermGen space" errors, which crash Fisheye and force me to restart the service. I've followed the example on the Atlassian support site to configure MaxPermSize within the service wrapper. However, when I check SysInfo inside the Fisheye Admin pages and the debug log, I don't see any confirmation. The Java Heap info is in both places, so I'd expect the MaxPermSize setting to show up in both places. The error is persisting and Atlassian support has been little help. I appreciate any help.

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SQL Server Database Settings

- by rbishop

For those using Data Relationship Management on Oracle DB this does not apply, but for those using Microsoft SQL Server it is highly recommended that you run with Snapshot Isolation Mode. The Data Governance module will not function correctly without this mode enabled. All new Data Relationship Management repositories are created with this mode enabled by default. This mode makes SQL Server (2005+) behave more like Oracle DB where readers simply see older versions of rows while a write is in progress, instead of readers being blocked by locks while a write takes place. Many common sources of deadlocks are eliminated. For example, if one user starts a 5 minute transaction updating half the rows in a table, without snapshot isolation everyone else reading the table will be blocked waiting. With snapshot isolation, they will see the rows as they were before the write transaction started. Conversely, if the readers had started first, the writer won't be stuck waiting for them to finish reading... the writes can begin immediately without affecting the current transactions. To make this change, make sure no one is using the target database (eg: put it into single-user mode), then run these commands: ALTER DATABASE [DB] SET ALLOW_SNAPSHOT_ISOLATION ONALTER DATABASE [DB] SET READ_COMMITTED_SNAPSHOT ON Please make sure you coordinate with your DBA team to ensure tempdb is appropriately setup to support snapshot isolation mode, as the extra row versions are stored in tempdb until the transactions are committed. Let me take this opportunity to extremely strongly highly recommend that you use solid state storage for your databases with appropriate iSCSI, FiberChannel, or SAN bandwidth. The performance gains are significant and there is no excuse for not using 100% solid state storage in 2013. Actually unless you need to store petabytes of archival data, there is no excuse for using hard drives in any systems, whether laptops, desktops, application servers, or database servers. The productivity benefits alone are tremendous, not to mention power consumption, heat, etc.

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How do I configure networking on CentOS 6 running on hyper-v?

- by LonelyLonelyNetworkN00b

I'm not using legacy adapters, and i've installed Linux Integration Components 3.2. THe problem i'm facing is that the command 'setup' or 'system-config-network' doesn't list any network interfaces. If i run ifconfig -a i can see both the network cards i've attached. By setting a ip using ifconfig i can get network connectivity. The problem is that it's not persistent after a reboot. I'm a 100% centos newbie, but I figure it has something to do with that the centos installer couldn't see the NICs on install. How can I fix this?

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once VPNed into pfSense, unable to hit the public URLs of my websites - they are routed to the pfSense box

- by Sean

I have a pfSense box setup as the firewall/router/VPN appliance at my colo. Once I VPN into the colo (either pptp or openvpn, pptp preferred due to multiple clients and ease of configuration), I am able to hit all my servers by their private 10.10.10.x ip and am able to browse the public internet without issue. When I try and hit the URL of a domain hosted by one of my servers, I am prompted for credentials. If I login using the pfSense credentials, I'm connected to pfSense as if I'd used it's internal IP. If I hack my hosts file to point url - server private IP it works fine, but this is obviously not a good solution. To recap: not connected to VPN - www.myurl.com works connected to VPN - www.myurl.com never makes it to the correct server, but is sent only to the pfSense box I'm sure it's something small that I've missed in the pfSense config.

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team viewer 8 beta wont run

- by Conner Jones

I installed team viewer 7 and then one of my friends using windows got version 8 so I installed the beta of version 8 for linux. When I try to run it for terminal I get these errors i atempted to do as the comment bellow said and when trying to run teamveiwer i stil got an error conner@DemonicGrace:~$ teamviewer Init... Checking setup... Launching TeamViewer... wine: cannot find L"C:\windows\system32\winemenubuilder.exe" err:wineboot:ProcessRunKeys Error running cmd L"C:\windows\system32\winemenubuilder.exe -a -r" (2) err:winedevice:ServiceMain driver L"MountMgr" failed to load err:secur32:SECUR32_initSchannelSP libgnutls not found, SSL connections will fail fixme:heap:HeapSetInformation (nil) 1 (nil) 0 fixme:ole:CoInitializeSecurity ((nil),-1,(nil),(nil),0,3,(nil),0,(nil)) - stub! fixme:heap:HeapSetInformation (nil) 1 (nil) 0 fixme:process:SetProcessShutdownParameters (00000100, 00000000): partial stub. fixme:resource:GetGuiResources (0xffffffff,0): stub fixme:win:EnumDisplayDevicesW ((null),0,0x32df64,0x00000000), stub! fixme:win:EnumDisplayDevicesW (L"\\.\DISPLAY1",0,0x32dc1c,0x00000000), stub! fixme:win:EnumDisplayDevicesW ((null),1,0x32df64,0x00000000), stub! please help me out if anyone has ideas im more than willing to listen

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How to connect Android phone to a Wifi network using PPPoE?

- by Slavo

I have an ISP at home, which provides me with a PPPoE connection. My router supports that and I've configured it to autoconnect periodically, so I don't have to type my username and password each time. When I connect to the Wireless router from the PC, I have internet and everything works fine. However, when I do so using my Android phone, there's no internet connection on the phone. It connects to the router, but I cannot open any web page. How can I enable internet access from such an ISP on my phone? Is it something in the router setup? The router is Linksys WRT54GL.

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Port Forwarding on Actiontec GT704-WG Router Issues

- by adamweeks

I am trying to setup a server at customer's location that has the Actiontec GT704-WG DSL router. The port forwarding it not working at all. Here's the details: Server: OpenSuse Linux box with a static IP address of 192.168.1.200 Application running accepting connections on port 8060 Firewall disabled Local connections (within the network) working properly Router: Updated to latest firmware available DHCP range set to 192.168.1.69-192.168.1.199 to not have any conflicts with the server Firewall set to "off" Rule set in the "Applications" setting to forward 8060 TCP and UDP to 192.168.1.200 machine (I've tried using the "TCP,UDP" option as well as both individual options) I've also tried just simply putting the server in the DMZ to see if I could connect to anything, but still nothing. Looking for any clues before I call and waste hours explaining the issue to tech support.

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Dovecot, POP3 and Gmail

- by Eric J.

I setup Postfix and Dovecot on a new Ubuntu box following these directions. From a client machine, I validate that POP3 seems to be working telnet mydomain.com 110 +OK Dovecot ready. USER [email protected] +OK PASS mypassword +OK Logged in. quit +OK Logging out. However, when trying to configure Gmail on the same client to retrieve email via POP3, I get the error Server denied POP3 access for the given username and password. Server returned error: "Login failed." I carefully confirmed that Gmail is configured to use the same POP Server, Port, Username and Password I used when checking the connection with telnet. What could be causing Gmail to get a "Login failed" message?

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does the *physical* order/location of drives in a mdadm-managed RAID-10 array matter?

- by locuse

i've setup a 4-drive RAID-10 array using mdadm-managed, software-raid on an x86_64 box. it'd up & running and works as expected, cat /proc/mdstat md127 : active raid10 sdc2[2] sdd2[3] sda2[0] sdb2[1] 1951397888 blocks super 1.2 512K chunks 2 far-copies [4/4] [UUUU] bitmap: 9/466 pages [36KB], 2048KB chunk atm the four SATA drives are physically plugged into the motherboard's 1st four SATA ports. i'd like to gather the necessary/complete info for catastrophic recovery. reading starting here, http://neil.brown.name/blog, and the mailing list, i'm not yet completely confident i have it right. i understand 'drive order matters'. is that logical, &/or physical order that matters? if i unplugged the four drives in this array, and plugged them each back into different ports on the motherboard or a pci card, as long as i've changed nothing in software config, will the array correctly auto-re-assemble?

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Deferred rendering order?

- by Nick Wiggill

There are some effects for which I must do multi-pass rendering. I've got the basics set up (FBO rendering etc.), but I'm trying to get my head around the most suitable setup. Here's what I'm thinking... The framebuffer objects: FBO 1 has a color attachment and a depth attachment. FBO 2 has a color attachment. The render passes: Render g-buffer: normals and depth (used by outline & DoF blur shaders); output to FBO no. 1. Render solid geometry, bold outlines (as in toon shader), and fog; output to FBO no. 2. (can all render via a single fragment shader -- I think.) (optional) DoF blur the scene; output to the default frame buffer OR ELSE render FBO2 directly to default frame buffer. (optional) Mesh wireframes; composite over what's already in the default framebuffer. Does this order seem viable? Any obvious mistakes?

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