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  • mysql is not connecting after data directory change

    - by user123827
    I've changed data directory in /etc/my.cnf. datadir=/data/mysql socket=/data/mysql/mysql.sock I also moved mysql folder from /var/lib/mysql/ to /data/mysql Now when i connect to mysql i get following error: [root@youradstats-copy mysql]# mysql ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2) also when i see /var/logs/msqld.log i get following messages in that: InnoDB: Setting log file /data/mysql/ib_logfile0 size to 512 MB InnoDB: Database physically writes the file full: wait... InnoDB: Progress in MB: 100 200 300 400 500 120704 7:43:31 InnoDB: Log file /data/mysql/ib_logfile1 did not exist: new to be created InnoDB: Setting log file /data/mysql/ib_logfile1 size to 512 MB InnoDB: Database physically writes the file full: wait... InnoDB: Progress in MB: 100 200 300 400 500 InnoDB: Cannot initialize created log files because InnoDB: data files are corrupt, or new data files were InnoDB: created when the database was started previous InnoDB: time but the database was not shut down InnoDB: normally after that. 120704 7:43:36 [ERROR] Plugin 'InnoDB' init function returned error. 120704 7:43:36 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed. I shut down mysql properly before doing these changes and then started it properly but dont know why getting these messages. please help to solve issue as i have changed socket path in my.cnf but still its pointing to old path...

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  • Why does my Internet slow to a crawl unless I reboot my router every few days?

    - by Lord Torgamus
    A few weeks ago, I noticed that my Internet connection had slowed down to a crawl. I waited a few days hoping it would go away on its own, but it didn't get better. So I asked this question about how to make it faster. The problem went away after I updated to the latest firmware, so I didn't follow up too carefully. But every few days since then, my Internet has slowed down again. Unlike before, all I have to do to fix it is open the router administration page and press the "Reboot" button. Nothing else seems to work, though I'm sure there are options I haven't tried. If it makes a difference, my girlfriend and I both transfer large amounts of data fairly routinely for school (videoconferencing, downloading entire recorded lectures). The router is a Cisco/Linksys 160N V3 that's about a year old. Most of the time, it deals with just two standard Windows 7 laptops. The only thing I came across while searching for answers/dupes was this question, which seems similar superficially, but probably doesn't have the same root issue. Anyways, it's not resolved. What could be causing these slowdowns, and how can I get rid of them?

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  • How do I apply multiple subnets to a server with one NIC?

    - by Cosban
    I am trying to route multiple IPs through one physical NIC on my dedicated server for use with Proxmox KVM VMs. I have a dedicated server which is currently running Debian 4.4.5-8 with 3 available ip addresses for use, which will be displayed as 176.xxx.xxx.196 (main), 176.xxx.xxx.198 (on same subnet as main) and 5.xxx.xxx.166 (different subnet). I am currently trying to route the third IP address with the dedi for use with a vps that I have set up using proxmox v2.x but am having a really, really hard time doing so. Virtual interfaces binding the additional IP addresses work as expected, ruling out external routing problems. The provider has given the following information for the IP addresses on the main subnet: gateway: 176.xxx.xxx.193 netmask: 255.255.255.224 broadcast: 176.xxx.xxx.223 As well as the following information for the IP address on the second subnet: gateway: 5.xxx.xxx.161 netmask: 255.255.255.248 broadcast: 5.xxx.xxx.167 Everything I've tried with /etc/network/interfaces has either not worked, or has rendered the network completely useless. This is the current state of the file, which has the secondary IP address working on the same subnet as well as IPv6 working, but not the second subnet. # Nativen IPv6 Schnittstelle iface eth0 inet6 manual # Bridge IPv4 Schnittstelle (176.xxx.xxx.193/27) auto vmbr0 iface vmbr0 inet static address 176.xxx.xxx.196 netmask 255.255.255.224 gateway 176.xxx.xxx.193 broadcast 176.xxx.xxx.223 bridge_ports eth0 bridge_stp off bridge_fd 0 bridge_maxwait 0 post-up ip addr add 176.xxx.xxx.198/27 dev vmbr0 auto vmbr1 iface vmbr1 inet static address 5.xxx.xxx.166 netmask 255.255.255.248 gateway 5.xxx.xxx.161 broadcast 5.xxx.xxx.167 bridge_ports eth0 bridge_stp off bridge_fd 0 bridge_maxwait 0 post-up ip addr add 5.xxx.xxx.166/27 dev vmbr1 # Bridge IPv6 Schnittstelle (Reichweite: xxxx:xxxx:xxxx:xxxx:xxxx:xxxx::/64) iface vmbr0 inet6 static address xxxx:xxxx:xxxx:xxxx:xxxx:xxxx netmask 64 up ip -6 route add xxxx:xxxx:xxxx:xxxx:xxxx:xxxx dev vmbr0 down ip -6 route del xxxx:xxxx:xxxx:xxxx:xxxx:xxxx dev vmbr0 up ip -6 route add default via xxxx:xxxx:xxxx:xxxx:xxxx:xxxx dev vmbr0 down ip -6 route del default via xxxx:xxxx:xxxx:xxxx:xxxx:xxxx dev vmbr0

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  • Mirror a Dropbox repository in Sharepoint and restrict access

    - by Dan Robson
    I'm looking for an elegant way to solve the following problem: My development team uses Dropbox for sharing documents amongst our immediate group. We'd like to put some of those documents into a SharePoint repository for the larger group to be able to access, as granting Dropbox access to the group at large is not ideal. However, we'd like to continue to be able to propagate changes to the SharePoint site simply by updating the files in Dropbox on our local client machines, and also vice versa - users granted access on SharePoint that update files in that workspace should be able to save their files and the changes should appear automatically on our client PC's. I've already done the organization of the folders so that in Dropbox, there exists a SharePoint folder that looks something like this: SharePoint ----Team --------Restricted Access Folders ----Organization --------Open Access Folders The Dropbox master account and the SharePoint master account are both set up on my file server. Unfortunately, Dropbox doesn't seem to allow syncing of folders anywhere above the \Dropbox\ part of the file system's hierarchy - or all I would have to do is find where the Sharepoint repository is maintained locally, and I'd be golden. So it seems I have to do some sort of 2-way synchronization between the Dropbox folder on the file server and the SharePoint folder on the file server. I messed around with Microsoft SyncToy, but it seems to be lacking in the area of real-time updating - and as much as I love rsync, I've had nothing but bad luck with it on Windows, and again, it has to be kicked off manually or through Task Scheduler - and I just have a feeling if I go down that route, it's only a matter of time before I get conflicts all over the place in either Dropbox, SharePoint, or both. I really want something that's going to watch both folders, and when one item changes, the other automatically updates in "real-time". It's quite possible I'm going down the entirely wrong route, which is why I'm asking the question. For simplicity's sake, I'll restate the goal: To be able to update Dropbox and have it viewable on the SharePoint site, or to update the SharePoint site and have it viewable in Dropbox. And since I'm a SharePoint noob, I'll also need help hiding the "Team" subfolder from everyone not in a specific group in AD.

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  • Mysql Cluster not working on Ubuntu

    - by user53864
    I am unable to setup MySQL Cluster on ubuntu servers. As a starting point I started from the link but I am not successful and the tar ball version I download is 6.3.45. As I wanted to test the mysql cluster, the Data node and SQL node are same but sql never appeared as connected in management node console and it looks like below. [ndbd(NDB)] 2 node(s) id=2 @192.168.1.107 (Version: version number, Nodegroup: 0, Master) id=3 @192.168.1.108 (Version: version number, Nodegroup: 0) [ndb_mgmd(MGM)] 1 node(s) id=1 @192.168.1.105 (Version: version number) [mysqld(API)] 2 node(s) id=4 (not connected, accepting connect from 192.168.1.107) id=5 (not connected, accepting connect from 192.168.1.108) On all the 3 machines mysql-server & client(apt-get install mysql-server mysql-client) were already installed and I completely stopped and also removed them at the system start up. Now the mysqld is from extracted cluster tar ball(/usr/local/mysql/support-files/mysql.server). As for testing, I created a test database on both the data nodes but the tables are also not syncing on other node. I checked many links, configurations are remained similar in all the links but somewhere it's going wrong. Anymore extra package is required?, Could anyone help me here..?. I am trying this for past 3 days... Thank you!

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  • 2 nics. 2 Defaults Gateways

    - by andre.dias
    Here is my scenario: i have this server with 2 nics, each one with different IPs, connected to differents routers. Almost everything is configured whe way i need. Traffic coming from eth0 exits using eth0, traffic coming from eth1 exits using eth1. And there is a default gateway configured. $route: default IP 0.0.0.0 UG 0 0 0 eth0 With this configuration, the traffic generated in the server is going out using eth0 (lynx www.google.com for example). The problem is: the Internet link from eth0 went down today. The traffic coming from eth1 was ok...no problem. But the traffic generated in the server was a problem...the default gateway was out...no access do the Internet anymore (no more lynx www.google.com) So i added a new default gateway configuration, pointing to eth1. For 30 minutes i kept that way...2 default gateways, but just one was "working"...and everything was working just fine. But then i removed de eth0 gateway entry because, well, 2 default gateways is kind of weird. My question: is there any problem on keeping these 2 default gateways, one for each? So i don´t need to do nothing when one link go down again? $route: default IP1 0.0.0.0 UG 0 0 0 eth0 default IP2 0.0.0.0 UG 0 0 0 eth1

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  • PostgreSQL lots of large Arrays and Writes

    - by strife911
    Hi, I am running a python program that spawns 8 threads and as each thread launch its own postmaster process via psycopg2. This is to maximize the use of my CPU-cores (8). Each thread call a series of SQL Functions. Most of these functions go through many thousands of rows each associated to a large FLOAT8[] Array (250-300) values by using unnest() and multiplying each FLOAT8 by an another FLOAT8 associated to each row. This Array approach minimized the size of the Indexes and the Tables. The Function ends with an Insert into another Table of a row of the same form (pk INT4, array FLOAT8[]). Some SQL Functions called by python will Update a row of these kind of Tables (with large Arrays). Now I currently have configured PostgreSQL to use most of the memory for cache (effective_cache_size of 57 GB I think) and only a small amount of it for shared memory (1GB I think). First, I was wondering what the difference between Cache and Shared memory was in regards to PostgreSQL (and my application). What I have noticed is that only about 20-40% of my total CPU processing power is used during the most Read intensive parts of the application (Select unnest(array) etc). So secondly, I was wondering what I could do to improve this so that 100% of the CPU is used. Based on my observations, it does not seem to have anything to do with python or its GIL. Thanks

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  • IIS High use & Server Performance issues

    - by HaydnWVN
    Have an SBS2011 running Exchange, a database app and a few other things serving 5 users (3 low use, 1 high). The server was never specced for the database app so it isn't as powerful as I'd like... Only 12GB RAM. We have increasingly found performance problems with this server, last week it was so bad I couldn't even connect remotely. To free up some available RAM I have (over the past month or so): Restricted the Exchange Message Store to 1GB with (so far) no ill effects. Restricted SQL Databases (including SBSMonitoring and Sharepoint/##SSEE (Which isn't used)). Now I am finding that IIS Worker threads are using up the available memory and I have (so far) been unable to track down much useful information about restricting them. This server is not 'serving' anything web-based apart from OWA that I am finding people using because Outlook is so slow (again related to the Servers performance). I am aware that Exchange on SBS2011 is designed to use up available resources (and concede when other applications request). But it is not doing so (or anywhere near fast enough) for our needs. Opening the database application (using Postgres) takes 5+ minutes from client machines and regularly times out or crashes due to this. After a reboot (before SQL/Exchange/IIS databases are very large/totally cached) we get the performace we need and expect. Previously a reboot once a month was enough... Then once a week... Now they have taken to rebooting it almost daily!

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  • BGP path prepended route not listed anywhere

    - by Julien Vehent
    We have a simple multi-homed setup with two routers that advertise our AS to two ISP. The second ISP (ISP B) is only used for backup when ISP A goes down, so we prepended our AS 3 times on this route. I spend a couple of hours this morning poking at looking glass routers all over the internet, and none of them list our backup route with the prepended path. I checked the south african internet exchange, the london internet exchange, oregon internet exchange and a couple dozen ISPs. All of them have multiples routes through ISP A, often with 3 or 4 hops. The route through ISP B should, at least, appear somewhere and have 5 or 6 hops. But I couldn't find it anywhere. (I checked the full bgp tables on the looking glass routers, using show ip bgp 65000) My questions are: Is there a limit to the size of a route after which most routers will simply discard the route ? Is our backup route even going to work when ISP A goes down, if no router knows about it ? Our two routers are connected on iBGP. Would it be possible that the route through ISPB is not announced because the iBGP session prefers the route through ISPA ? This is what non-exist-map and advertise-map are supposed to do, but none of those are used in either routers.

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  • VMware Virtual Infrastructure Web Access not starting on Fedora 14

    - by FusionHammer
    I am running a Fedora 14 server with VMware Server 2. When I initially installed VMware Server, everything was working fine. This included accessing Web Access on port 8333 (https) and 8222 (http). I had to perform a server restart and afterwards, the Web Access is not starting when I run: /etc/init.d/vmware-mgmt start The VMware Server Host Agent starts [OK], but the Web Access has no [OK] or [Failed] next to it. I also checked ports 8333 and 8222 by running a netstat, but neither are showing up. In addition, I checked the proxy.log and client.log files in the following directory: /usr/lib/vmware/webAccess/tomcat/apache-tomcat-6.0.16/logs/ The proxy.log doesn't have entries in it past 9-18-2012, which is the date the server restart occurred. The client.log is empty. I not sure what is causing this issue or what log files will be helpful in narrowing down the cause. I could re-install VMware Server, but I would like to narrow down the cause as it could occur again with the new re-installed environment.

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  • Nvidia GTS 360M in Asus laptop shuts off when gaming on external display

    - by mr odus
    I have had this problem on my Asus G51j Intel I5, Nvidia GTS360M graphics card. Just updated the drivers to latest off Nvidias site. Most games I play, If I hook it up through an external monitor(this happens whether it's HDMI or VGA). The laptop hard shuts down after about 20 minutes, give or take. This tends to happen on more graphically intense games like Call of dutys, bioshock. I'm running Windows 7, latest nvidia drivers. Games work fine on my laptops screen, and Movies, general computing work fine on the external displays. The laptop always sits on a cooling pad and the latest time was in front of my AC unit, I ran heatfan or whatever the heat tracking software was, and my temperatures were normal through a shut down. This has been happening for the life of the laptop. I dont play very many games, and even fewer on an external monitor, so this issue doesnt come up much Is it possible I have a faulty graphics card? Is there anything else I can try?

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  • Win7 Domain User Profile- Desktop Icon management best practices request

    - by Doltknuckle
    Here's the situation: We have a large (5,000+ user) organization that is currently using folder redirection to manage the windows desktop icons. This folder is redirected to a network share where we can centrally manage the different sites and such. When a user tries to use a computer when the network is not available, they are unable to use any shortcuts in the Public folder. We only redirect the C:\Users\%username%\Desktop folder. Does anyone have any suggestions of how to go about managing desktop icons? We still want a central location to manage these items, but find a way to keep the system working when the network is unavailable. As a point of clarification, the network rarely goes down. We do have instances where a few computers do not have a network connection. Usually, something is simply unplugged. Since we have multiple sites, the line from a branch to the central office has gone down a few times. This is more of an attempt to maintain a positive end user experience when disconnected from the network.

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  • Bugzilla email issue

    - by xian
    My bugzilla system keep hit the following error: There was an error sending mail from '[email protected]' to '[email protected]':Can't send data I think that is some problem with my setting and configuration. First is the urlbase I have tried setting it to bugzilla.example.com, and http://127.0.0.1:81/, and http://10.0.0.236/ (My laptop IP address, I use this laptop to set up bugzilla) but the error still persists. Actually what should I put in the urlbase field? Parameter = Email Under mail_delivery_method, i choose SMTP. Under mailfrom, I put bugzilla-daemon. smtpserver, I tried leaving it blank, or setting it to 220.181.12.12 before, but could not solve my problem For my sql, the following is the data and command I used: C:\mysql\bin>mysql --user=root -p mysql Enter password: 1234 (When I install mysql into my laptop, it ask me to key an username and password, i have key in username as 'cvuser' and password as '1234', but here never ask me to key in any username) Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 1 Server version: 5.5.15 MySQL Community Server (GPL) mysql> GRANT ALL PRIVILEGES ON bugs.* TO 'bugs'@'localhost' IDENTIFIED BY '123456'; Query OK, 0 rows affected (0.03 sec) In C:\Bugzilla\localconfig, I put the following info: # # How to access the SQL database: # $db_host = "localhost"; # where is the database? $db_port = 3306; # which port to use $db_name = "bugs"; # name of the MySQL database $db_user = "bugs"; # user to attach to the MySQL database # # Enter your database password here. It's normally advisable to specify # a password for your bugzilla database user. # If you use apostrophe (') or a backslash (\) in your password, you'll # need to escape it by preceding it with a \ character. (\') or (\\) # $db_pass = '123456'; Can someone tell me where my mistake is? I have googled for this issue for few days but still cannot find the solution.

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  • Ubuntu Server: Networking fails with MODPROBE option in /etc/network/interfaces ... ??

    - by neezer
    For some reason (which I haven't been able to determine yet), yesterday morning the networking service on our web server (running Ubuntu 8.04.2 LTS -- hardy) wouldn't start, and our website went down. I noticed the following error message when trying to restart it: * Reconfiguring network interfaces... /etc/network/interfaces:6: option with empty value ifup: couldn't read interfaces file "/etc/network/interfaces" ...fail! Line 6 in the /etc/network/interfaces file concerned a MODPROBE command, which (I believe) loaded in the ip_conntrack_ftp module so that I could use PASV on my FTP server (vsftpd): (breaking modprobe commands commented out below) # Used by ifup(8) and ifdown(8). See the interfaces(5) manpage or # /usr/share/doc/ifupdown/examples for more information. # The loopback network interface auto lo iface lo inet loopback #MODPROBE=/sbin/modprobe #$MODPROBE ip_conntrack_ftp pre-up iptables-restore < /etc/iptables.up.rules # The primary network interface # Uncomment this and configure after the system has booted for the first time auto eth0 iface eth0 inet static address xxx.xxx.xxx.xxx netmask 255.255.255.0 gateway xxx.xxx.xxx.1 dns-nameservers xxx.xxx.xxx.4 xxx.xxx.xxx.5 I've verified that there is a file in /sbin called modprobe. Like I said earlier, this setup had been working flawlessly until yesterday morning (though my bosses say that the site actually went down the previous night at 11 PM EST). Can anyone shed some light on (A) why this broke, and (B) how can I re-enable the ip_conntrack_ftp module?

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  • BIOS corrupted? How to proceed? Acer Travelmate 290

    - by dtlussier
    I have a older ACER Travelmate 290 (manufactured in 2002 or 2003), which I recently tried to upgrade to Ubuntu 9.10. After doing the upgrade process it appeared as if I had a problem with my x server configuration, as on the first reboot post-install I heard the Ubuntu startup sound, but had a black screen. I thought I would then reboot again to drop down into text-mode to trouble shoot the x configuration problem. However, when I tried rebooting, something went wrong and since then when I start up the machine I get absolutely nothing except the first hardware check (i.e. HDD light flashes, CD/DVD drive spins, etc.). Other than that the screen remains totally black and I have no HDD or processor activity at all. I have tried restarting it a number of time holding down all kinds of key combinations to try and coax it into the BIOS (if possible) with no luck. I have also tried putting in both a live Linux disc and a Windows install disk without any luck. With a disk in the drive it will spin for a few seconds and then stop. All this has lead me to suspect that the BIOS is somehow corrupt (not sure about the right terminology). I have tried putting a new BIOS image and installer program downloaded from ACER on a USB key to see if it will run when I start up the machine, but no luck. I'm not sure if this method of interacting/updating/flashing the BIOS will work outside of Windows/DOS as both OSs are mentioned kind of ambiguously in the documentation. I have also taken the laptop case apart and inspected the various cards and cannot find any obviously burned out components. I'm not sure how to proceed at this point in terms of components to try, or how to try and load a new BIOS image onto the board. Any advice here would be great, especially from those with experience with this particular line of laptops. Thanks!

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  • iBook G4 has black screen on boot

    - by Jonathan Patt
    I have an old iBook G4 (A1054, 1.2 GHz) which has issues when it loses power or is shut off. If the battery drains—which happens quickly, as its remaining capacity is very low—it enters some sort of weird mode where it's not really awake (the screen is black, can't do anything) but it has no pulsing light indicating it's asleep either. The only way to exit this mode is to hold down the power button for ten seconds until it shuts off, and attempt rebooting it. Almost always, however, it makes the sound of the optical drive starting up, and then doesn't continue past that point. The screen doesn't come on, and things like resetting PRAM don't work. Occasionally a fan comes on loudly for a second or two. This sometimes seems to correspond with my pressing down on the rear-right casing, above the power jack. In the past, shutting it off, disconnecting it from power, removing the battery and waiting for 30 minutes would do the trick, but this time I have done that several times, letting it sit for up to several hours before retrying, to no avail. Any ideas?

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  • Windows 2008 R2 AWS CloudFormation Elastic beanstalk configuration

    - by Webmonger
    I'm looking for some configuration advice. I have a need for a load balanced windows environment with shared media across all instances that are hosting the app. The best explanation i can give is that there will be multiple Windows 2008 server with IIS hosting the app going through an ELB to load balance. Users must be able to upload content (images, video etc...) to the site that will be hosted. When a user uploads media it needs to be kept on a shared location so all windows IIS instances can access the files, I can't host the files on S3 because of the app architecture so they need to be in a place where all IIS server will have access. In addition I need to run an update each IIS server instance that updates a local memory cache when SQL data is updated. I was thinking of a configuration like this: [ELB] - [Win 2008 IIS (multiple servers)] - [Win 2008 File & SQL Server(possibly RDS?)] Does this configuration make sense? If not could you provide an idea of how I should configure it. Thanks in advance

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  • Domain joined computer unable to access servers through VPN

    - by kscott
    Our servers are in a virtual off site hosting center, our office has a vpn connection to the data center, but for reasons I don't understand we also have to connect to the Citrix Access Gateway (CAG) client in order to access the servers. I am a programmer with rather limited ops knowledge including a weak grasp of networking and terminology. Bear with me. I was just given a new laptop, which is a 64 bit Windows 7 system unlike my previous 32 bit Windows XP desktop which was able to connect without issue. My laptop has been joined to the domain so that I login with my AD credentials, I am able to connect to the CAG and get authenticated, and after doing this I can ping our servers and they resolve to the correct internal IP addresses, but I am unable to use remote desktop to the servers, connect to SQL servers through my local SQL Management Studio, navigate to them through the file system, or view any of our internal intranet websites. All of which I was able to do previously. I have tried turning off my Windows firewall and the problem remains, the DNS servers are set to the correct IPs of our domain controllers, and the ops guys here are a little stumped. Does any one have any suggestions?

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  • Set up WLAN in 3-level house

    - by Balint Erdi
    I'm having a hard time setting up the network in our house. It has three levels (basement, ground floor, first level). The WLAN is set up by an ASUS RT-N12 router which provides perfect coverage for the ground floor and the basement. However, I set up my "home office" in the basement where the signal barely arrived. So I purchased a TP-Link TL-WA901ND (300 Mbps) Access Point which I set up in the other corner of the ground floor to expand the ASUS router's range. I used the AP's Repeater mode for that. The distance between my computer and the TP-Link AP is 6-7 meters. There is a staircase going down from the ground floor to the basement so there are no solid walls between the computer and the AP. This setup mostly works (I am writing this from the basement) but it is not reliable (the signal strength sometimes goes down to ~40% of the max) sometimes so I wonder if I am doing it correctly or if there is a better way. Screenshot of the router's and the AP's dashboard screen follow: Any comments on what I am doing wrong or hints for improvement are appreciated. Thank you. UPDATE Tried one more thing, setting up the TP-LINK AP in Access Point mode. That way, I can make it use a different SSID. I enabled WDS/Bridge so that it expands the range of the ASUS router (see screenshot). That does not work, either, if I connect to the network set up by the TP-LINK device (PELSTER-2), I can't reach the external network (the Internet). It seems the problem always comes back to this, the TP-LINK does not have access to the external network, whatever its mode of operation.

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  • Web Server Routing Based On Location

    - by Eric
    I have a website that has users from both Hong Kong and Australia. Unfortunately, since the server is located in Australia, users from Hong Kong are going to suffer latency problems. Traffic has to go through US before travelling back to Australia. So I've setup a server in Hong Kong as well, and users using the .hk TLD are going to be redirected to the Hong Kong web server. It shares the same database server with the Australian server but due to aggressive SQL query caching, impact on performance from latency from SQL queries are negligible. But for users accustomed to the Hong Kong website but have since traveled to Australia, they suffer from additional latency because they go to the .hk site which redirects to the HK server even when they're in Australia. The website is targeted at international students from Hong Kong so this is an significant issue for me. Instead of redirecting users to the closest web server based on the TLD, how do I redirect users based on their location? Currently I am using nginx, postgres and Django. Say I know how to estimate users' location based on users' IP addresses, what is my next step? At what level would I work on? What topic should I read up?

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  • How harmful is a hard disk spin cycle?

    - by Gilles
    It is conventional wisdom¹ that each time you spin a hard disk down and back up, you shave some time off its life expectancy. The topic has been discussed before: Is turning off hard disks harmful? What's the effect of standby (spindown) mode on modern hard drives? Common explanations for why spindowns and spinups are harmful are that they induce more stress on the mechanical parts than ordinary running, and that they cause heat variations that are harmful to the device mechanics. Is there any data showing quantitatively how bad a spin cycle is? That is, how much life expectancy does a spin cycle cost? Or, more practically, if I know that I'm not going to need a disk for X seconds, how large should X be to warrant spinning down? ¹ But conventional wisdom has been wrong before; for example, it is commonly held that hard disks should be kept as cool as possible, but the one published study on the topic shows that cooler drives actually fail more. This study is no help here since all the disks surveyed were powered on 24/7.

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  • Windows 7 keeps insisting that it needs to check disk for consistency, but never does

    - by Mike
    Lately Windows 7 has been telling me that I need to check disk D: for consistency. This happens more than 50% of the time when booting up. The first time, I didn't touch anything so that it would go ahead and do its scan. It didn't seem to do anything - just booted straight into Windows. The second time I tried to skip it by pressing any key. It ignored all of my keystrokes and still counted down to 0 (then skipped the disk check). Sometimes, it gets down to 0 but then just hangs... no indication that anything is going on. This is happening on a < 3 month old laptop. C: and D: are on the same physical disk - just two partitions. I never get any notification that C: needs to be checked for consistency. It's a ~300GB HD. C: has 60gb (32gb free) and D: has ~240GB (122gb free). What could be causing this to keep coming up? What can I do to fix it? Thanks!

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  • Script to unstick VNC keys?

    - by MidnightLightning
    I've run into dropped key events when connecting via VNC clients, leading to a "stuck key" (usually a meta key like CTRL or ALT) and searching around the common answer on how to solve it is often "press and release each meta key individually until the problem resolves". However, I've found this to be annoying and time consuming to try and solve it this way. Plus on a bad connection, it sometimes will miss the "key up" event for the meta key again, and still keep the key stuck. So I'm looking for an automated way to do this: From a script on the client side or the server side, is there a way to trigger "key up" events for all the meta keys (CTRL, ALT, SHIFT, and WIN/CMD, both Left and Right versions)? Or just a command to release all keys the server thinks are down at the moment? Or some scripted way to at least list which keys the server end thinks are down so I know which key to keep pressing and releasing to try and release it? I've got a Mac on the server end, so a Mac/Linux solution would be needed for my situation.

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  • vCenter 5.1 SSO Configuration option not available in Web Client?

    - by goober
    Problem I just finished separately installing vCenter Server 5.1. I installed the components separately but on the same machine using a local SQL 2008 R2 DB (not SQL express). Everything appears to be working correctly with the exception of SSO. It doesn't find the AD server. This is to be expected (see below) but I don't know how to fix it. Potential Leads / Steps taken During the install of SSO, I was logged on as a local administrator (waiting on central IT dept to create a service account). As a result, I received a message saying that SSO wouldn't be able to automatically locate the AD. (fair eonugh) After I read up on it a little bit, I believed I could go into the SSO Configuration option in the Web client, like so: However, what I actually see is: I also notice that the "SSO Users and Groups" entry is not there. Betting that has something to do with it as well. Question How can I get the "Configure" Option to show up for SSO? Overall goal: How can I manually enter the AD server in this scenario while logged in as a local administrator? References VMWare vCenter 5.1 Installation: Part 9 (Optional SSO Configuration) [Derek Seaman's Blog] (used the image of correct configuration menu)

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  • MySQL Cluster ndb_mgmd error

    - by Patryk
    I set up MySQL Cluster on Ubuntu. My ndb_mgmd.cnf file looked: [NDBD DEFAULT] NoOfReplicas=2 DataDir= /var/lib/mysql-cluster # Management Node [NDB_MGMD] NodeId=1 HostName=192.168.204.20 DataDir=/var/lib/mysql-cluster # Storage Nodes (one for each node) [NDBD] NodeId=2 HostName=192.168.204.25 DataDir=/var/lib/mysql-cluster [NDBD] NodeId=3 HostName=192.168.204.26 DataDir=/var/lib/mysql-cluster # SQL Nodes (one for each node) [MYSQLD] NodeId=4 HostName=192.168.204.30 Now I want to edit this configuration, so I changed this file: [NDBD DEFAULT] NoOfReplicas=2 DataDir= /var/lib/mysql-cluster # Management Node [NDB_MGMD] NodeId=1 HostName=192.168.204.20 DataDir=/var/lib/mysql-cluster # Storage Nodes (one for each node) [NDBD] NodeId=2 HostName=192.168.204.25 DataDir=/var/lib/mysql-cluster [NDBD] NodeId=3 HostName=192.168.204.26 DataDir=/var/lib/mysql-cluster # SQL Nodes (one for each node) [MYSQLD] NodeId=4 HostName=192.168.204.25 [MYSQLD] NodeId=5 HostName=192.168.204.26 But ndb_mgm > show; still shows: Connected to Management Server at: localhost:1186 Cluster Configuration --------------------- [ndbd(NDB)] 2 node(s) id=2 (not connected, accepting connect from 192.168.204.25) id=3 (not connected, accepting connect from 192.168.204.26) [ndb_mgmd(MGM)] 1 node(s) id=1 @192.168.204.20 (mysql-5.1.51 ndb-7.1.9) [mysqld(API)] 1 node(s) id=4 (not connected, accepting connect from 192.168.204.30) I tried: sudo /etc/init.d/mysql-ndb-mgm restart sudo ndb_mgmd --initial sudo ndb_mgmd -f /etc/mysql/ndb_mgmd.cnf And nothing works. Any help?

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