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  • Error "fileid changed" when accessing files over NFS

    - by Roman Prikhodchenko
    I have an nfs-kernel-server configured and running on Ubuntu 10.04 Server. /export THIRD_SERVER_IP(rw,fsid=0,insecure,no_subtree_check,async) SECOND_SERVER_IP(rw,fsid=0,insecure,no_subtree_check,async) /export/ebs THIRD_SERVER_IP(rw,fsid=0,insecure,no_subtree_check,async) SECOND_SERVER_IP(rw,nohide,insecure,no_subtree_check,async) I mounted the exported folder to the second server: mount -t nfs4 -o proto=tcp,port=2049 NFS_SERVER_IP_HERE:/ebs /ebs and it works just fine. I mounted it to the third server but I cannot access files from it. ls -l /ebs ls: reading directory /ebs: Stale NFS file handle total 0 The syslog on the third server says: kernel: [11575.483720] NFS: server NFS_SERVER_IP_HERE error: fileid changed kernel: [11575.483722] fsid 0:14: expected fileid 0x2, got 0x6e001 Some info: uname -r 2.6.32-312-ec2 uname -m i686

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  • Authentication required by wireless network.

    - by Roman
    I would like to use a wireless network from Ubuntu. In the network drop-down menu I select a network (this is a University network I have an account there). Then I get a windows with the following fields: Wireless Security: [WPA&WPA2 Enterprise] Authentication: [Tunneled TLS] Anonymous Identity: [] CA Certificate: [(None)] Inner Authentication: [some letters] User Name: [] Password: [] I put there my user name and password and do not change default value and leave "Anonymous Identity"blank. As a result of that I get "Authentication required by wireless network". How can I solve this problem? I think it is important to notice that our system administrator tried to find some files (which are probably needed to be used as "CA Certificate"). He said that he does not know where this file is located on Ubuntu (he support only Windows). So, probably this is direction I need to go. I need to find this file. But may be I am wrong. May be something else needs to be done. Could you pleas help me with that?

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  • Mounting Replicated Gluster Multi-AZ Storage

    - by Roman Newaza
    I have Replicated Gluster Storage which is used by Auto scaling Servers. Both, Auto scaling and Storage are allocated in two Availability zones. Gluster: Number of Bricks: 4 x 2 = 8 Transport-type: tcp Bricks: Brick1: gluster01:/storage/1a # Zone A Brick2: gluster02:/storage/1b # Zone B Brick3: gluster03:/storage/2a # Zone A Brick4: gluster04:/storage/2b # Zone B Brick5: gluster01:/storage/3a # Zone A Brick6: gluster02:/storage/3b # Zone B Brick7: gluster03:/storage/4a # Zone A Brick8: gluster04:/storage/4b # Zone B I used Round Robin DNS for Gluster entry point, so DNS name resolves to all of the storage server addresses which are returned in different order all the time: # host storage.domain.com storage.domain.com has address xx.xx.xx.x1 storage.domain.com has address xx.xx.xx.x2 storage.domain.com has address xx.xx.xx.x3 storage.domain.com has address xx.xx.xx.x4 The Storage is mounted with Native Gluster Client: # grep storage /etc/fstab storage.domain.com:/storage /storage glusterfs defaults,log-level=WARNING,log-file=/var/log/gluster.log 0 0 I have heard Gluster might be mounted with the first Server IP and after that it will fetch its configuration with the rest of Servers. Personally, I never tested single Server mount setup and I don't know how Gluster handles this. On EC2, traffic among single Availability zone is free and between different zones is not. When Client in zone A writes to storage and IP of Storage in zone B is returned, it will cost me twice more for data transfer: Client (Zone A) - Storage Server (Zone B) - Replication to Storage Server (Zone A). Question: Would it be better to mount Storage Server of the same zone, so that data transfer charges apply only for replication (A - A - B)?

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  • Gluster bricks are offline and errors in logs

    - by Roman Newaza
    I have substituted all the IP addresses with hostnames and renamed configs (IP to hostname) in /var/lib/glusterd by my shell script. After that I restarted Gluster Daemon and the volume. Then I checked if all the peers are connected: root@GlusterNode1a:~# gluster peer status Number of Peers: 3 Hostname: gluster-1b Uuid: 47f469e2-907a-4518-b6a4-f44878761fd2 State: Peer in Cluster (Connected) Hostname: gluster-2b Uuid: dc3a3ff7-9e30-44ac-9d15-00f9dab4d8b9 State: Peer in Cluster (Connected) Hostname: gluster-2a Uuid: 72405811-15a0-456b-86bb-1589058ff89b State: Peer in Cluster (Connected) I could see mounted volumes size change on all the nodes when I execute df command, so new data is coming. But recently I noticed error messages in app log: copy(/storage/152627/dat): failed to open stream: Structure needs cleaning readfile(/storage/1438227/dat): failed to open stream: Input/output error unlink(/storage/189457/23/dat): No such file or directory Finally, I have found out some bricks are offline: root@GlusterNode1a:~# gluster volume status Status of volume: storage Gluster process Port Online Pid ------------------------------------------------------------------------------ Brick gluster-1a:/storage/1a 24009 Y 1326 Brick gluster-1b:/storage/1b 24009 N N/A Brick gluster-2a:/storage/2a 24009 N N/A Brick gluster-2b:/storage/2b 24009 N N/A Brick gluster-1a:/storage/3a 24011 Y 1332 Brick gluster-1b:/storage/3b 24011 N N/A Brick gluster-2a:/storage/4a 24011 N N/A Brick gluster-2b:/storage/4b 24011 N N/A NFS Server on localhost 38467 Y 24670 Self-heal Daemon on localhost N/A Y 24676 NFS Server on gluster-2b 38467 Y 4339 Self-heal Daemon on gluster-2b N/A Y 4345 NFS Server on gluster-2a 38467 Y 1392 Self-heal Daemon on gluster-2a N/A Y 1402 NFS Server on gluster-1b 38467 Y 2435 Self-heal Daemon on gluster-1b N/A Y 2441 What can I do about that? I need to fix it. Note: CPU and Network usage of all the four nodes are about the same.

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  • Can IIS7 execute php files?

    - by Roman
    I have IIS7 on my computer. It can display html files. But if I put a PHP program in the corresponding folder and then try to open it with the Chrome browser I do not see the expected page. Instead Chrome "downloads" this file. Is it beacuse IIS7 cannot display the PHP files?

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  • Mounting GlusterFS share under www-data user

    - by Roman Newaza
    Problem: After directory is auto-mounted, Web Server has no write permissions to it. Question: How to auto-mount GlusterFS endpoint via /etc/fstab so that mount point belongs to www-data after it's mounted? For now, the mount point belongs to www-data, but after mounting it turns to root. # /etc/fstab foo.com:/st /st glusterfs defaults 0 0 Seams like I cannot define user / group as mount options for GlusterFS, at least I don't see it when man glusterfs. Thanks!

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  • Why class 'SQLiteDatabase' is not found in /var/www/*.php?

    - by Roman
    I am trying to use sqlite from PHP. I have the following simple code: <?php $db = new SQLiteDatabase("test2.sdb"); unset($db); ?> As the result of this code (which I execute in the command line "php test2.php") I get: Fatal error: Class 'SQLiteDatabase' not found in /var/www/test2.php on line 3 Does anybody know how can I make PHP able to use sqlite? P.S. Here I found out that "SQLite support is enabled by default on a standard Linux PHP compilation starting with PHP 5.0." And I have "PHP Version = 5.2.6-2ubuntu4.6". So, sqlite should be enabled unless the "--disable-sqlite". In my case output of "phpinfo();" does not contain "sqlite" at all.

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  • Running bridged-networking vmware player on a Linux machine with 2 interfaces

    - by Roman D
    I have got a laptop running Arch Linux with 2 interfaces: wireless (wlan0) and ethernet (eth0). I use wlan0 to access internet (static IP, networking is configured using netcfg), and I connect a second PC to the eth0. Now, whenever I start vmware player (v. 4.0.4), it chooses wlan0 to connect its bridged virtual NIC to, but I need it to connect to eth0 (I want my guest machine to be able to talk to the second physical PC on eth0). So, I disable the wlan0 interface (netcfg -d wireless) and restart vmware. Now, it connects to eth0, and everything works fine; I can ping the host PC from the virtual one, and I can ping the virtual PC from the second physical PC connected to eth0. Then, if I try to reenable the wlan0 interface (netcfg -u wireless), all of the connectivity between the host and the guest (and between the second physical PC and the guest) gets lost, until I disable wlan0 again. Can someone please give me a hint on what's going on?

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  • How can I unregister a service with dns-sd?

    - by Roman
    I am trying to use "dns-sd" command line tool on my Windows 7 machine. I can already do something. For example I can register a service using "dns-sd -R ...". I also can browser (see) registered services using "dns-sd -B ...". What I still miss, is how to unregister a service. At the moment when I type "dns-sd -R ..." the dns-sd does not return me to the command prompt. To return to the command prompt I need to press Ctrl-C. And the service stays registered till I press Ctrl-C. What I want is to run "dns-sd -R ..." in the background regime and then I would like to have a possibility to unregister a service from the command line. One more thing which I do not understand yet is what "to look up a service" means. In my picture it should be sufficient to register a service, to see it and then to unregister it. But apparently I need to look up a service. What does it mean and why I need to do it? ADDED: As it is asked, I clarify. I refer to "dns-sd" command line tool which I use in Windows 7. I think this command is part of Bonjour software for Windows (from Apple). Well, I did not checked if I had this command before I installed Bonjour, but I assume I did not have it. So, my question is about this command.

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  • How do I install the latest version of packages in Ubuntu?

    - by Roman
    For example I want to install the latest version of "numpy". I type the following: "sudo apt-get install python-numpy". When I type this the first time it installs something and if I type this the second time it writes that I have already the latest version of numpy. However, I see that my version of numpy is 1.1.1. and I know that it NOT the latest version. Why it happens and how this problem can be solved? I can find the *tar.gz file with the latest version, I can extract files with the archive and than I need to rune one of the scripts which will be somewhere among the extracted files. But I do not like this way. It is too complicated. I do not know where I should put all these files, I do not know which dependencies I should install before I run the script for the installation of numpy, I do not know where numpy will be put after installation and so on. Is there an easy way to get the latest version of numpy?

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  • What WYSIWYG software can I use to create a web page?

    - by Roman
    I always made web pages by writing HTML code but now I would like to try to use some WYSIWYG approach. Can anybody recommend me a program which I can use for that? I mean a program in which you can move buttons, tables, pictures by mouse. You can change size and shape by mouse. You can use nice templates for "block of text", buttons, background and so on. I am using Windows 7. May be I already have something pre-installed?

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  • Error "fileid changed" when accessing files over NFS

    - by Roman Prikhodchenko
    I have an nfs-kernel-server configured and running on Ubuntu 10.04 Server. /export THIRD_SERVER_IP(rw,fsid=0,insecure,no_subtree_check,async) SECOND_SERVER_IP(rw,fsid=0,insecure,no_subtree_check,async) /export/ebs THIRD_SERVER_IP(rw,fsid=0,insecure,no_subtree_check,async) SECOND_SERVER_IP(rw,nohide,insecure,no_subtree_check,async) I mounted the exported folder to the second server: mount -t nfs4 -o proto=tcp,port=2049 NFS_SERVER_IP_HERE:/ebs /ebs and it works just fine. I mounted it to the third server but I cannot access files from it. ls -l /ebs ls: reading directory /ebs: Stale NFS file handle total 0 The syslog on the third server says: kernel: [11575.483720] NFS: server NFS_SERVER_IP_HERE error: fileid changed kernel: [11575.483722] fsid 0:14: expected fileid 0x2, got 0x6e001 Some info: uname -r 2.6.32-312-ec2 uname -m i686

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  • How can I unregister a service with dns-sd?

    - by Roman
    I am trying to use "dns-sd" command line tool on my Windows 7 machine. I can already do something. For example I can register a service using "dns-sd -R ...". I also can browser (see) registered services using "dns-sd -B ...". What I still miss, is how to unregister a service. At the moment when I type "dns-sd -R ..." the dns-sd does not return me to the command prompt. To return to the command prompt I need to press Ctrl-C. And the service stays registered till I press Ctrl-C. What I want is to run "dns-sd -R ..." in the background regime and then I would like to have a possibility to unregister a service from the command line. One more thing which I do not understand yet is what "to look up a service" means. In my picture it should be sufficient to register a service, to see it and then to unregister it. But apparently I need to look up a service. What does it mean and why I need to do it?

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  • Web Service gets unavailable after several concurrent calls

    - by Roman
    We are testing GoDaddy Virtual Data Center and came to a very strange issue when our web site gets unavailable. GoDaddy Support keeps saying the issue is in our web server settings, but looking at the result of our tests I doubt it. TEST ENVIRONMENT Virtual DataCenter with Windows hosted at GoDaddy.com. All servers have Windows Server 2008 R2 Datacenter, IIS 7. Server One with IP address 10.1.0.4 Server Two with IP address 10.1.0.3 Both servers are in private network not visible from outside. Port Forward with IP address 50.62.13.174. Port Forward is assigned to Server One TEST DESCRIPTION JMeter is used as a Client App to simulate 30 concurrent users sending 100 SOAP requests each. Interval between requests is 1 second. Http link used for testing: http://50.62.13.174/v2/webservices.asmx TEST ONE Test is run from a computer in our office. After JMeter starts running test, almost immediately, the link above becomes unavailable in a browser. After test completion, the link is not available in a browser for about 5 more minutes. Remote Desktop is working well, so we can connect to Server One remotely. After about 5 minutes since test completion, the link becomes available in a browser again. TEST TWO Test is run from Server Two (that is part of our virtual data center). Test works very well, no visible delays in processing. The link is available in a browser all the time. TEST THREE Test is run from Server One using localhost. The result is the same as in TEST TWO - no issues. TEST FOUR We repeated TEST ONE from other computers that we have located in different countries, all with the same result as TEST ONE. CONCLUSION As the test works well from Server Two, but does not work from outside our virtual data center, we feel there are issues with the network or its capacity. The whole behaviour looks like out requests from outside get stuck somewhere before reaching our virtual data center. Has anybody had similar issues in the past? Are there chances that something is wrong with our server settings?

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  • How do I register a service with Bonjour?

    - by Roman
    I am trying to start to use Bonjour. Here I found a manual how to register a service with Bonjour. The following is written there: The network services architecture in Bonjour includes an easy-to-use mechanism for publishing, discovering, and using IP-based services. Well let's see how to register a service. In the very beginning it is written: To publish a service, an application or device must register the service with a Multicast DNS responder But how?!?! First of all I do not know what is the Multicast DNS responder. Second, it is not written how do I do it. Where and what should I type? Should I use command line? Should I use some programming languages? What exactly should I type... Is there an easy way to start to use Bonjour? Well, it was emphasized several times how easy it should be to use it. But I cannot start to use it for several day. So, can anybody, pleas, help me with that?

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  • How can I find out if a port is opened or not?

    - by Roman
    I have installed Apache server on my Windows 7 computer. I was able to display the default index.php by typing http://localhost/ in the address line of my browser. However, I am still unable to see this page by typing IP address of my computer (neither locally (from the same computer) no globally (from another computer connected to the Internet)). I was told that I need to open port 80. I did it (in a way described here) but it did not solve the problem. First of all I would like to check which ports are opened and which are not. For example I am not sure that my port 80 was closed before I tried to open. I am also not sure that it is opened after I tried to open it. I tried to run a very simple web server written in Python. For that I used port 81 and it worked! And I did not try to open the port 81. So, it was opened by default. So, if 81 is opened by default, why 80 is not? Or it is? ADDITIONAL INFORMATION: 1. In my httpd.conf file I have "Listen 80". 2. This site tells me that port 80 on my computer is opened. 3. I get different responses if I try http://myip:80 and http://myip:81. In the last case browser (Chrome) writes me that link is broken. In the first case I get: Forbidden You don't have permission to access / on this server. 4. IE writes that "The website declined to show this webpage".

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  • What technologies allow bidirectional streaming of video?

    - by Roman
    Wikipedia says that Flash allows "bidirectional streaming of audio and video". Is it possible to do that with other technologies (for example with JavaScript)? In other words, I want to transfer video from one user of web-site to another one in real time. I want to have something that is already installed by many users or easy to install (Flash fulfills this requirements). And I want to have something free.

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  • Insufficient channel capacity of 1GBit

    - by Roman S
    There is a Caching Server (Varnish): it receives data from Amazon S3 on request, saves it for some time and gives it to the client. We have encountered the problem of insufficient channel capacity of 1GBit. Peak load within 4 hours completely chokes the channel. Server performance is sufficient for now. Approximately 4.5TB of data are transmitted per day. More than 100TB are accumulated per month. The first thought that comes to mind is simply to add one more 1GBit port and sleep peacefully until 2GBit are not enough (it may happen quite quickly) or one server is not able to handle it. And then we just need to add new Caching Servers. But now we need a Load Balancer, which will send requests on one and the same URL, always on one and the same server (to avoid multiple copies of the same cached objects). Here are the questions: Does a Balancer need a band equal to sum of all bands of Caching Servers? What shall we do in case there are no ports in a Balancer? Should we add more Balancers or solve the problem by means of Round robin DNS? What are the standard approaches to such problems? Can anyone advise hosting-companies, which can solve this problem? We are interested in American and European markets.

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  • How to troubleshoot a remote wmi query/access failure?

    - by Roman
    I'm using Powershell to query a remote computer in a domain for a wmi object, eg: "gwmi -computer test -class win32_bios". I get this error message: Value does not fall within the expected range Executing the query local under the same user works fine. It seems to happen on both windows 2003 and also 2008 systems. The user that runs the shell has admin rights on the local and remote server. I checked wmi and dcom permissions as far as I know how to do this, they seem to be the same on a server where it works, and another where it does not. I think it is not a network issue, all ports are open that are needed, and it also happens within the same subnet. When sniffing the traffic we see the following errors: RPC: c/o Alter Cont Resp: Call=0x2 Assoc Grp=0x4E4E Xmit=0x16D0 Recv=0x16D0 Warning: GssAPIMechanism is not found, either caused by not reassembled, conversation off or filtering. And an errormessage from Kerberos: Kerberos: KRB_ERROR - KDC_ERR_BADOPTION (13) The option code in the packet is 0x40830000 Any idea what I should look into?

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  • Rules to choose hardware for OLTP systems (sql server)

    - by Roman Pokrovskij
    Ok. We know database size, number of concurrent users, number of transactions per minute; should choose number of processors, RAID, RAM, mirroring and clustering. There are no exact rule.. but may be there are no rules at all? In my practice in every case I have "legacy" system, and after some inspections and interview I can form an opinion how hardware and design can be improved. But every time when I meet "absolutely" new system (I guess there are no new systems, but sometimes are such tasks) I can't say anything trustful. So I'm interesting how people deal with such tasks? They map task on theirs experience or have some base formulas?

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  • Mounting Gluster Volumes

    - by Roman Newaza
    I have created Hosted Zone with 2 IP addresses of Gluster Cluster, both IP are returned by dig. After mounting Gluster, I cannot ls mount point as it takes long time. mount shows me it's mounted, but df doesn't. Finally, I have this: ls: cannot access /mnt/storage: Transport endpoint is not connected. But if I mount it with the one of the IP, no problem - volume contents is accessible OS: Ubuntu 11.10 GlusterFS: 3.2.6 Log: http://pastie.org/private/2jgp4h1hnqgzych3djtg I have can telnet storage from client - ports are open.

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  • mailsend not sending to (or qmail not receiving from) the same machine

    - by roman
    A web applications sends two emails: to the user of the webapp to the administrator the administrators mailbox (qmail) is on the same machine as the web application (php, apache, /usr/sbin/sendmail). email 1 works, email 2 sometimes doesn't work. I don't see any pattern in the mails that don't work. Also because I don't exactly know WHICH emails failed (since the email itself would be the only notification). email 2 looks like this: from: <[email protected]> #changes for each user to: <[email protected]> What could be the problem? Are rejected emails stored somewhere? (if they are rejected.. how do I check this?)

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  • How to display "Comic Sans MS" in Linux?

    - by Roman
    I use "Comic Sans MS" font on my web page. The web page looks OK if I open it under Windows and MAC. But it does not work under Linux. How can I solve this problem? May be I can put the font on my web server? Is this font available for free? Can it slow down my page? Or may be I can replace "Comic Sans MS" by another font which is similar and is available on the 3 operation systems?

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