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  • How to backup data from linux servers to linux server (incremental + snapshot)?

    - by wag2639
    We have a handful of hosted servers running RHEL4 and RHEL5 and would like to backup some key folders (I'm thinking /var /srv and /etc) to a local server we have in house. The local server is running Ubuntu 9.10 Server edition. I'm looking for a free (preferably OSS) way to grab (or push) incremental backups to my local server and once a month or so, make a new snapshot for incremental updates in between snapshots. Also, while I'm comfortable with using a command line, others may need to use the system in the future, and I would like some kind of graphical or web interface to browse the backup repository. Suggestions?

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  • Understanding RAM usage on Linux

    - by stebbo
    I'm completely new to Linux and I'm just trying to understand where all my RAM is going. I've got a pretty fresh install of Xubuntu running as a VMWare guest, and I've given it 1.5GB RAM to play with. After only running two apps starting up Tomcat servers and also running Firefox, I've got hardly anything left. 160MB according to free -m. Looking at the output from Top, I see Java appearing twice, each stealing about 1/2 Gig resident memory. Both Tomcat instances use the same jdk, I would have thought I'd only see Java there once. What's the story? I had a screenshot but unfortunately couldn't post it being under 10 rep. Update The free -m output requested: total used free shared buffers cached Mem: 1419 1380 39 0 8 111 -/+ buffers/cache: 1259 160 Swap: 509 68 441 Top (coming)

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  • Vmware peaks NFS load every 30 seconds

    - by gtirloni
    We were troubleshooting a performance problem on one of our storage servers and after investigating almost everything in sight we saw that every 30 seconds, Vmware would go from 10k IOPS (NFS) to 30k, 50k, 100k or whatever the server would handle. Most of it were reads. What could cause this raise in NFS operations per second every 30 seconds? The virtual machines are managed by external customers and there isn't much in common between them. While breaking utilization down by filename, we discovered 5-10 virtual machines that contributed more to those peaks but it still doesn't explain why every 30 seconds. There are no other peaks outside that 30 sec period (ie. it stays in an almost constant average). Is there an NFS tweak in Vmware to change that 30 second period? If that's really necessary, we would like to introduce some variation so all that workload isn't dropped all at once. It's causing NFS timeout on the ESX 3.5/4.0 hosts when the storage gets overloaded.

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  • Resolving Domainnames differently for different services

    - by mlaug
    Some time ago we had an issue with our network infrastructure and php with curl. Our Network infrastructure is fairly simple. LoadBalancer/Firewall = 5 servers The Domainname of our website is set to the ip of the Loadbalancer, of course. But calling curl from one of the servers did result in a timeout. It appears that a server could not call for its own domain it is serving. So we had to set the domains via /etc/hosts to the sever itself. But now We have implemented a Varnish in front of the Loadbalancer, which we want to automatically purge, once a change on a page happens. So now we need to call the domain www.example.com/url_to_purge. Sadly this call what be resolved to the server itself instead of the varnish, because of the /etc/hosts entries. So now I am wondering, if you could resolve domain names differently for different services :)

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  • Windows XP alt-tab: How to restrict options to certain applications, in certain order and exclude others?

    - by Rob
    In Windows XP Alt-tab keypress sequence to select applications, how can I ensure that certain applications always appear, in a certain order, with others always excluded? Background for asking is that most XP-based machines that I am working with on a shop floor present the list of shortcuts in a certain order and certain applications. There is one machine however, that displays an additional application. This is a hindrance to the users of the machines, as the nature of their work is routine and this variation disrupts the remembered sequence, "disrupts their flow". Thoughts? Being a good superuser, I research first before asking, and I found: Applications randomly alt-tab? (especially full screen games) Restore Alt-Tab behavior so that minimizing an app once again moves it to the end? (2. looks close to the control I need, but would need more finer, preciser control over what appears in the selection). Suggestions? (Thanks in advance.)

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  • Are there web search engines with exact match or regex capabilities (for related terms)?

    - by naxa
    Every once in a while I come upon a situation when google's way of searching results in too broad results even if I enclose my search terms in quotation marks. For example now I've tried to find pages that contain both "py.path" and "path.py" without much success. I'm currently aware of engines|sites like Google Code Search for searching actual code and (apparently) Stackoverflow for searching QAs, symbolhound that lets me find symbols, and also wikipedia is often a good place to find lists of symbols. But none of these seems to perform very good in matching exactly on search term pairs (or tuples) and use a broad-enough segment of the web. Is there a website that is good with exactly finding search term pairs? (Why not?)

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  • mod_security: How to allow ssh/http access for admin?

    - by mattesque
    I am going to be installing mod_security on my AWS EC2 Linux instance tonight and need a little help/reassurance. The only thing I am truly worried about right now is making sure my (admin) access to the instance and webserver is maintained w/o compromising security. I use ssh (port 22) and http (80) to access this and I've read horror stories from other EC2 users claiming they were locked out of their sites once they put up a firewall. So my question boils down to: What settings should I put in the mod_security conf file to make sure I can get in on those ports? IP at home is not static. (Hence the issue) Thanks so, so, so much.

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  • ISCSI sessions appear from nowhere

    - by Maraca
    Hi, I am using Win2008 32bit Ent. running in Hyper-V with 2 LUNs over ISCSI connection (this is a MS cluster with one LUN being quorum and second as a storage). In ISCSI - target - details I see multiple sessions from same target (currently 7), however I am not sure where they are coming from as I have only one virtual NIC on this server. Sure enough 2 LUNs appear 7 times each in device manager or in disk manager. On the cluster partner however, I do not see that problem. There is only one session per target. Installing MPIO makes only difference - I am getting 8 sessions instead of 7 once I reboot. Does any one know what can cause this behavior?

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  • Model View Controller² [closed]

    - by user694971
    I am working on a quite complex web application in Go and I tried to stay in an MVC pattern. However, I ended up having a structure isomorphic to this: /boilerplate The usual boilerplate an application needs to survive in the wilderness /db Layer talking to an SQL DB /helpers Helpers /logic Backend logic, not directly affiliated with any routes, sessions etc. /templates View /web Glue between /logic and /templates. In more dynamic languages the size of /web would be next to zero. But Go doesn't exactly have a RoR integrated so I need a lot of helper structures to feed the templates with data, to process GET/POST parameters and session information. I remember once reading about patterns similar to MVC with one extra letter but Wiki-searching I couldn't find it right now. (BTW currently /logic also contains data retrieval from API services to fill some hash maps; this is no simple task, but that probably belongs into the model, right?) So question: is this structure considered sane? Or does it need some bending to be tagged MVC app?

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  • Upgrade from 10.04 to 10.10 on netbook: now or later?

    - by jbatista
    I began with installing 9.04 in a netbook (Asus EeePC 1000H), upgraded to 9.10 and have now Lucid Lynx 10.04 (LTS). Most things tested run pretty good, with the most notable exception being wireless network due to the hardware which I first tested after the last major upgrade and a few times before giving up (failed to maintain connection to WPA2 networks). Other nuisances are not as important (e.g. some hotkeys work, a couple of them don't), but given that most everything works I'm concerned with doing an upgrade to find most things have been broken and I have to go back and dig up on how to get it to work... Once in a while, I look up for some posts elsewhere to read up on problems and to find out if they're tame enough to justify an upgrade to 10.10. I'm not in a rush, but I'm not interested in being too left behind some time from now that an upgrade becomes too costly or downright impossible (many things formatted too differently). I'm not even sure if it's possible to "easily" upgrade from LTS to LTS release... Therefore I ask if it's (in principle) possible to skip releases and only do a major upgrade much later on. For example, is it possible (or advisable) to do an upgrade only when the next LTS comes out (a couple of years from now)? Or is it preferable not to skip releases at all?

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  • External hard disk not showing up as removable media

    - by mark
    Windows 7 Pro x64, my external hard drive is a Western Digital Carviar Black. The hard drive is connected via USB (tried all my 2.0 and 3.0 ob my Gigabyte GA-X58A-UD7) but once I initialized it in the "disk management" (or whatever the proper term is; I'm using a German edition of Windows) I have to assign it a manual drive letter. Otherwise it doesn't show up. I'm confused because usually externally connected drives (be it USB sticks or real hard disks) just show up as "Removable media", but this one doesn't. Is this OK/expected? Will there be troubles when I go to another Windows computer? I formatted the drive with quick format and NTFS. I changed the permissions to have read/write for "Everyone" on that drive. thanks

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  • SQL 2008/2005 Hosting :: Error - “Named Pipes Provider, error: 40 – Could not open a connection to SQL Server”

    - by mbridge
    When setting up a Microsoft Windows Server 2008 system, I went through the motions to set up IIS, MS SQL Server 2008, and Visual Studio 2010 to use as a test-bed. One of the immediate benefits of setting up such a system is that most development can be done remotely: MS SQL Server Management Studio, Visual Studio’s Web development suite, as well as file shares, remote desktop, etc, make for a great way to remotely develop in ‘pristine’ conditions. But there are drawbacks, too, such as needing to deal with firewall issues, not being able to penetrate past a router or the requirement of setting up a VPN. One of the problems I encountered when trying to remote into the MS SQL Server 2008 that I’d set up was the following error: Named Pipes Provider, error: 40 – Could not open a connection to SQL Server I followed the below steps, and was able to connect to the server after just a few moments of tinkering: 1. From the server in question, surf to this Microsoft article, and download and install the Firewall rules modification program. Never drop your firewall, even on a development machine, unless you have a really good reason to. 2. Launch SQL Server Configuration Manager. Navigate to SQL Server Network Configuration, then Protocols for your server name. Enable TCP/IP and Named Pipes by right-clicking and choosing Enable for each given Protocol Name. 3. Restart the SQL Server service from Services (or from command line, subsequently run “net stop mssqlserver” then “net start mssqlserver”. 4. Try your remote connection once more, and you should be able to connect. It’s not a terribly difficult concept, but one of the more challenging tasks developers face is dealing with environment setup. And while there is a certain blurred-line overlap between software development and server administration, sometimes the latter is daunting, especially given that you might set up only a handful of servers during your career.

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  • Configure Linux server hardware buttons for soft reset or power cycle?

    - by Jakobud
    I have a small modest CentOS server at home. I run it headless because anytime I access it, it's always via SSH. Anyways, tonight it became unresponsive to the network. I could not connect to it to investigate. In this case, I have to hook up a keyboard and monitor to see the problem. I ended up just rebooting it. But after this experience, I was wondering if it's possible to configure the hardware buttons on the CPU case to perform a graceful reboot or graceful power cycle in Linux. Even though the server becomes unresponsive once in a blue moon, it would be nice to simply press a button and have it shutdown all services and gracefully reboot. Anyone know how this could be accomplished?

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  • Merging two sites into one, how to redirect from the domain that's going away?

    - by bikeboy389
    I haven't been able to find any existing questions that cover my exact issue, so here goes: My client wants her two sites (domain1.com and domain2.com) rolled into a single, new site under domain1.com. Once the site is ready on domain1.com, DNS for domain2.com would be pointed at the same server as domain1.com. I know how to do an htaccess rewrite rule that would make all domain2.com traffic map to a specific single page or directory within domain1.com. But that's not what the client wants. What she wants is for a bunch of specific pages on domain2.com to map to specific new pages on domain1.com. For example: domain2.com/index.php?pageid=58 GOES TO domain1.com/2011/04/somearticle domain2.com/index.php?pageid=92 GOES TO domain1.com/2011/03/differentname etc. I could put a bunch of 301 redirects in the htaccess on domain1.com, which would work fine. The problem is, the client doesn't want/need specific redirects for ALL the domain2.com pages, and if I just do 301 redirects, anybody who comes looking for a domain2.com page that I haven't built a specific redirect for will get a 404 error. So I need to use 301 redirects for some traffic, and a rewrite rule for any traffic that's not covered in the 301 redirects. How do I do sort of a blending of a rewrite rule and 301 redirects, all in the htaccess file for domain1.com? Is this possible? Is it as simple as putting the 301 redirects in the htaccess file first, then doing the rewrite rule? I'm guessing not.

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  • Linux Minux 12 Freezes (Gnome 2) - How to go about finding and fixing cause?

    - by AsH
    This freezing issue has been reported by others over the past few months but no clear answer has been provided. Some have attributed it to Banshee or other music players but this is incorrect since I have this problem and never while using anything other than perhaps Firefox. (I am not sure if it is necessarily due to firefox). Logging out and logging back in seems to remedy the problem. However, it would be nice to fix things once and for all. This problem began in the past 3 weeks. I alway have all Mint updates implemented.

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  • SSH + SAMBA + LDAP question

    - by Mejmo
    Hi, I have SSH + LDAP working (I can log to Server2 with credentials from LDAP server Server1). Now, I would like to add Samba server (Server3) and it would be nice if it authenticates the users like Server2. How can I achieve this ? As I see Samba schema and the schema used for storing Unix users are different. So if I change password in Samba schema, I would be able to log in with the old password. I need centralized storage of username/passwords. If I change it once in phpldapadmin, it means for samba and ssh. Thanks.

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  • Is there a way to convert a list of cc'es to a distribution list in Outlook?

    - by Will M
    In Outlook 2003, I find myself frequently sending emails to the same group of people all working on a project. I'd like to find a simple way to convert the list of addresses in an email that I would "reply all" to into an Outlook distribution list for future use. I know how to create Outlook distribution lists, that's not my question. But the normal process that I see in Outlook requires adding the names to the list one by one. If I have an email with a large "reply all" list is there any way to take that whole list all at once (including many email addresses not otherwise already in my Outlook contacts) and convert it to a distribution list in one step? Trying to google for this answer got me many, many pages of instructions on how to create a distribution list, but I can't seem to find the search term to locate an answer on how to convert a list of address.

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  • openvpn and selective routing

    - by mx2323
    hi everyone, whats the best way to configure openvpn clients to go selectively go about using an openvpn connection? i want to setup a vpn server for friends in china, but i dont want them to use it for everything, just so they can access sites like youtube, facebook, cnn, etc. while they are in china through the vpn (these are blocked). it would be nice if the vpn was a backup, so for instance if they are trying to go to facebook (which is blocked), it would go through the vpn connection once finding that the normal connection does not work. this would save a lot of bandwidth cost actually, and give them a better browsing experience. is this a iptable route thing? or a dns server that i push to my clients?

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  • Needed inputs for helping hospitals/practices save money on mandatory compliance Policies and Course

    - by Jason Gaya
    Hey, Recently one of my clients came up to me and asked "Is there any way we can save some money on mandatory compliance policies and courses, and I started wondering what can I do? I started creating a calculator to show some savings if they used elearning. I wanted your input to validate that data. How many Policies your practice/hospital need to sign and average number of pages per policy? Also how many employees need to sign these policies? This would be really helpful and once I have this done I will send a copy to you as well...Thank You for all the help and support

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  • NFS default to 777

    - by ipengineer
    I have an NFS share. This share is shared between several different applications. Our web server is running PHP and when it creates directories it is not setting the permissions correctly so it cannot write to the directory once created. How can I mount this NFS share to where PHP has full read/write access? Below is the directory that has been created along with the media server export options and the mount options on the web server. Ideally I could set the permissions on /opt/mount and whatever group/user is on that directory when I mount to that point the share assumes those permissions. dr----x--t. 2 nobody nobody 4096 Jun 5 2014 user_2 Mount output: media.dc1:/home/fs_share on /opt/mount type nfs (rw,vers=4,addr=10.10.20.127,clientaddr=10.10.20.42) Exports file from media server: /home/fs_share 10.10.20.0/255.255.255.0(rw,sync,no_root_squash)

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  • Tricking Linux apps about current time with environment variables

    - by geek
    Sometimes it is possible to trick a Linux app by calling it like this: HOME=/tmp/foo myapp This would make myapp think /tmp/foo is the home directory, it won't try to get the user id, find its home directory via getpwent(). This is useful when myapp must be forced to dump some of its config files into a non-standard location different than ~. A similar trick can be done like this: LANG=foo LC_ALL=bar myapp This is useful when myapp needs to be called once with a different locale without having to make the change persistent by using the export bash built-in or even modify stuff in /etc/profile. Is it possible to pull the same trick with time and date? The goal is to make an app use another time than the system ones. The final goal - to make timestamps that appear in logs/commit messages not being tied to the system time.

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  • Windows XP occasionally hangs for 2-3 minutes as the splash screen fades in.

    - by marcusw
    This is a bit of a rare problem, I have not been able to debug or fix it or find anyone else with the issue. I hope someone here can help me out. Once in a while, I boot up Windows XP from the first partition of the first disk (using grub, the computer dual-boots ubuntu) and it hangs as the Windows XP splash image fades in, leaving the screen with a dim image of the splash screen. After 2-3 minutes, it continues to boot as normal, no error messages or strange behavior. I have noticed that this happens about 75% of the time when the last time the computer was shut down it was from Ubuntu, and maybe 5-10% of the time otherwise. I have looked at system logs as far as I was able, and did not find anything the miss. What is causing this and how can I fix it?

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  • Can an SSD notify the hosting OS that its wear level is getting high?

    - by Tony_Henrich
    I read a lot about SSDs and I am interested in them for server use. My biggest concern is their reliability. A lot of writes shortens their life span. I can mitigate this problem if I can run some kind of diagnostics on a regular basis on the SSD or if the SSD can automatically warn the OS that its reliability is reaching a critical level. Think of this as S.M.A.R.T or software like SpinRite for SSDs. Does anything I mentioned exist now? Which kind/brand of SSD does this? I don't mind swapping out a tired SSD for a newer one once a while. I am pretty sure that SSDs life is calculated in years and not in few months? For me, the improved performance will pay for the SSD over and over. I am planning to use plenty of RAM as well.

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  • mod_rewrite to redirect to specific WP page

    - by djdy
    The goal is to redirect all requests coming to Wordpress from IE 6 and 7, to a specific Wordpress page using mod_rewrite. My confusion comes from multiple conditions that are needed for the rewrite not entering an endless loop once on the specific Wordpress page. So the condition must be: (IE 6 or 7) and request is not the same as the page we are sending them to. I've tried things along the lines of: RewriteCond %{HTTP_USER_AGENT} MSIE\ ([67])\. RewriteCond %{REQUEST_URI} !iepage RewriteRule .* /iepage/ [R] In IE 6 and 7, I get page cannot be displayed errors. Could it really mean too many redirects, because the 2nd condition isn't working?

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  • Overload Protection

    - by Tyron
    Is there a simple way how I could redirect a visitor (via .htaccess or PHP script) to a static page when the server is overloaded from too many requests? It doesn't have to be a protection against huge amounts of requests at once or protect against DoS Attacks. I think our server would be protected enough if we could prevent the standard website to be shown and instead show a single file "overloaded.html". Also how could I get a measure for a server being overloaded on a typical managed server (= non root access to a Linux server) environment?

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