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  • Simple end-to-end load and bottleneck monitoring for DB-based web sites

    - by T.J. Crowder
    What tools do you use / would you recommend for monitoring a Linux-based, DB-based website's servers for bottlenecks and load? The obvious goal being to know when growth has gotten to the point where it's necessary to scale up (or out) one or more of the bits and pieces because the current system won't be managing the load if an observed trend continues. I'm looking for general recommendations based on standard Linux load metrics, disk I/O metrics, network I/O metrics, etc., but if specifics are helpful: It'll be Tomcat6 using APR (possibly with a Varnish or similar caching and balancing front-end), MySQL, and either Ubuntu 8.04 LTS or 10.04 LTS depending on timing. I know about top, vmstat, iostat, bwmon and the like that collect and parse info from the /proc file system (et. al.); and obviously MySQL provides a lot of queriable performance information. I could use those directly, probably automating periodic monitoring logs with scripts and such. But I have a suspicion that I'd be reinventing a wheel... For example, Hyperic HQ seems to be along the lines of what I'm looking for. Others? Meta: I tend to think of "recommendation" questions as needing to be CW because there's no one right answer, but I see a lot of these here that aren't CWs, so I haven't marked it as one. I'll happily do so if enough people think I should.

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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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  • Web-based SVG or JavaScript Org Chart or Tree Graph Plotting Visualization API

    - by asoltys
    Hi, I'm looking to build an interactive web-based org chart for a large organization. I somewhat like the interface at ancestry.com where you can hover over people and pan/zoom around and click on different nodes to make them the root. Ideally, I'd like it if people could belong to multiple organizational entities like committees, working groups, etc. In other words the API should support graphs in general, not just trees. I'd like to be able to visually explode each organizational substructure into substituents by clicking on it, with a nice animation of the employees ballooning or spilling out so you can really interactively drill down through the organization. I found http://code.google.com/apis/visualization/documentation/gallery/orgchart.html but it looks a bit rudimentary. I know there are desktop tools like OrgPlus and Visio that can build static charts but I'm really looking for a free, web-based API with open standards-based output like SVG or HTML5 Canvas elements rather than Flash or some proprietary output. Something I can embed into a custom web application and style myself. Something interactive.

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  • Is browser based wireless authentication secure?

    - by johnnyb10
    Our wireless network previously used a preshared WPA/WPA2 key for guest access, which allows them access to the Internet. (Our employee access uses 802.1x authentication). We just had a wireless consultant come in to fix various wireless issues we had; one of the things he wound up doing was changing our guest access to HTML-based instead of the preshared key. So now that guest SSID is open (instead of using WPA) and users are presented with a browser-based login screen before they can get on the Internet. My question is: Is this an acceptable method from a security standpoint? I would assume that having an open network is necessarily a bad idea, but the consultant said that the traffic is still using PEAP, so it's secure. I didn't get a chance to question him further on this because we ran late and a bunch of other things came up. Please let me know what you think about the advantages/disadvantages of using HTML-based wireless authentication as opposed to using a preshared WPA key. Thanks...

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  • IPTables Reroute SSH based on Connection string?

    - by senrabdet
    We are using a cloud server (Debian Squeeze) where public ports on a public IP route traffic to internal servers. We are looking for a way to use IPTables and ssh where based on some part of the ssh connection string (or something along these lines) iptables will reroute the ssh connection to the "right" internal server. This would allow us to use one common public port, and then re-route ssh connections to individual servers. So, for example we hope to do something like the following: user issues ssh connection (public key encryption) such as ssh -X -v -p xxx [email protected] but maybe adds something into the string for iptables to use iptables uses some part of that string or some means to re-route the connection to an internal server using something like iptables -t nat -A PREROUTING ! -s xxx.xxx.xxx.0/24 -m tcp -p tcp --dport $EXTPORT -j DNAT --to-destination $HOST:$INTPORT ....where $HOST is the internal ip of a server, $EXTPORT is the common public facing port and $INTPORT is the internal server port. It appears that the "string" aspect of iptables does not do what we want. We can currently route based on the IP table syntax we're using, but rely on having a separate public port for each server and are hoping to use one common public port and then re-route to specific internal servers based on some part of the ssh connection string or some other means. Any suggestions? Thanks!

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  • NHibernate child deletion problem.

    - by JMSA
    Suppose, I have saved some permissions in the database by using this code: RoleRepository roleRep = new RoleRepository(); Role role = new Role(); role.PermissionItems = Permission.GetList(); roleRep .SaveOrUpdate(role); Now, I need this code to delete the PermissionItem(s) associated with a Role when role.PermissionItems == null. Here is the code: RoleRepository roleRep = new RoleRepository(); Role role = roleRep.Get(roleId); role.PermissionItems = null; roleRep .SaveOrUpdate(role); But this is not happening. What should be the correct way to cope with this situation? What/how should I change, hbm-file or persistance code? Role.cs public class Role { public virtual string RoleName { get; set; } public virtual bool IsActive { get; set; } public virtual IList<Permission> PermissionItems { get; set; } } Role.hbm.xml <?xml version="1.0" encoding="utf-8" ?> <hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="POCO" namespace="POCO"> <class name="Role" table="Role"> <id name="ID" column="ID"> <generator class="native" /> </id> <property name="RoleName" column="RoleName" /> <property name="IsActive" column="IsActive" type="System.Boolean" /> <bag name="PermissionItems" table="Permission" cascade="all" inverse="true"> <key column="RoleID"/> <one-to-many class="Permission" /> </bag> </class> </hibernate-mapping> Permission.cs public class Permission { public virtual string MenuItemKey { get; set; } public virtual int RoleID { get; set; } public virtual Role Role { get; set; } } Permission.hbm.xml <?xml version="1.0" encoding="utf-8" ?> <hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="POCO" namespace="POCO"> <class name="Permission" table="Permission"> <id name="ID" column="ID"> <generator class="native"/> </id> <property name="MenuItemKey" column="MenuItemKey" /> <property name="RoleID" column="RoleID" /> <many-to-one name="Role" column="RoleID" not-null="true" cascade="all"> </many-to-one> </class> </hibernate-mapping>

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  • How to Modify Data Security in Fusion Applications

    - by Elie Wazen
    The reference implementation in Fusion Applications is designed with built-in data security on business objects that implement the most common business practices.  For example, the “Sales Representative” job has the following two data security rules implemented on an “Opportunity” to restrict the list of Opportunities that are visible to an Sales Representative: Can view all the Opportunities where they are a member of the Opportunity Team Can view all the Opportunities where they are a resource of a territory in the Opportunity territory team While the above conditions may represent the most common access requirements of an Opportunity, some customers may have additional access constraints. This blog post explains: How to discover the data security implemented in Fusion Applications. How to customize data security Illustrative example. a.) How to discover seeded data security definitions The Security Reference Manuals explain the Function and Data Security implemented on each job role.  Security Reference Manuals are available on Oracle Enterprise Repository for Oracle Fusion Applications. The following is a snap shot of the security documented for the “Sales Representative” Job. The two data security policies define the list of Opportunities a Sales Representative can view. Here is a sample of data security policies on an Opportunity. Business Object Policy Description Policy Store Implementation Opportunity A Sales Representative can view opportunity where they are a territory resource in the opportunity territory team Role: Opportunity Territory Resource Duty Privilege: View Opportunity (Data) Resource: Opportunity A Sales Representative can view opportunity where they are an opportunity sales team member with view, edit, or full access Role: Opportunity Sales Representative Duty Privilege: View Opportunity (Data) Resource: Opportunity Description of Columns Column Name Description Policy Description Explains the data filters that are implemented as a SQL Where Clause in a Data Security Grant Policy Store Implementation Provides the implementation details of the Data Security Grant for this policy. In this example the Opportunities listed for a “Sales Representative” job role are derived from a combination of two grants defined on two separate duty roles at are inherited by the Sales Representative job role. b.) How to customize data security Requirement 1: Opportunities should be viewed only by members of the opportunity team and not by all the members of all the territories on the opportunity. Solution: Remove the role “Opportunity Territory Resource Duty” from the hierarchy of the “Sales Representative” job role. Best Practice: Do not modify the seeded role hierarchy. Create a custom “Sales Representative” job role and build the role hierarchy with the seeded duty roles. Requirement 2: Opportunities must be more restrictive based on a custom attribute that identifies if a Opportunity is confidential or not. Confidential Opportunities must be visible only the owner of the Opportunity. Solution: Modify the (2) data security policy in the above example as follows: A Sales Representative can view opportunity where they are a territory resource in the opportunity territory team and the opportunity is not confidential. Implementation of this policy is more invasive. The seeded SQL where clause of the data security grant on “Opportunity Territory Resource Duty” has to be modified and the condition that checks for the confidential flag must be added. Best Practice: Do not modify the seeded grant. Create a new grant with the modified condition. End Date the seeded grant. c.) Illustrative Example (Implementing Requirement 2) A data security policy contains the following components: Role Object Instance Set Action Of the above four components, the Role and Instance Set are the only components that are customizable. Object and Actions for that object are seed data and cannot be modified. To customize a seeded policy, “A Sales Representative can view opportunity where they are a territory resource in the opportunity territory team”, Find the seeded policy Identify the Role, Object, Instance Set and Action components of the policy Create a new custom instance set based on the seeded instance set. End Date the seeded policies Create a new data security policy with custom instance set c-1: Find the seeded policy Step 1: 1. Find the Role 2. Open 3. Find Policies Step 2: Click on the Data Security Tab Sort by “Resource Name” Find all the policies with the “Condition” as “where they are a territory resource in the opportunity territory team” In this example, we can see there are 5 policies for “Opportunity Territory Resource Duty” on Opportunity object. Step 3: Now that we know the policy details, we need to create new instance set with the custom condition. All instance sets are linked to the object. Find the object using global search option. Open it and click on “condition” tab Sort by Display name Find the Instance set Edit the instance set and copy the “SQL Predicate” to a notepad. Create a new instance set with the modified SQL Predicate from above by clicking on the icon as shown below. Step 4: End date the seeded data security policies on the duty role and create new policies with your custom instance set. Repeat the navigation in step Edit each of the 5 policies and end date them 3. Create new custom policies with the same information as the seeded policies in the “General Information”, “Roles” and “Action” tabs. 4. In the “Rules” tab, please pick the new instance set that was created in Step 3.

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  • What Do I Need To Know About Servers In a Web Development Role?

    - by john
    I know that may sound a little vague, so I'll try and explain a little further... After being self employed developer for many years I'm now in search of a commercial web developer role. My only experience with servers and hosting is uploading through FTP and playing around with CPanel/WHM a little. The role's I'm going for are web development PHP, MySQL, HTML, CSS type roles, but in recent interviews I've been asked questions about setting up things on the server, that I had no idea what was being said... which wasn't ideal! Without knowing more than I do, it's hard to explain what exactly I'm looking to learn, but it's basically just the server elements I should know as a web developer? If you're a web developer, do you have any dealing with the server apart from uploading files, and if so, what? Are things like Subversion(SVN) and version control systems often set up by the web development team, could that be what they were talking about?

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  • SysAdmin Career Question: Internal or Client Based

    - by Malnizzle
    ServerFault Community, It seems there are two positions SysAdmins find themselves in, either you are working for a non-IT services based single client (your employer) and providing in-house IT support or you work for a company who provides out sourced IT services to multiple clients. Right now I work for a company who does the latter, and I often consider how nice it would be doing the in-house side of things, to just have one network I am focused on and instead of feeling like I have a dozen bosses between clients and internal management, I would just have one set of management and people to appease. There is also the technical aspect of every client wanting something different, and having to manage numerous different technology platforms, or trying to force clients into using the technologies we prefer, neither situation is enjoyable. Is this just "the grass is greener on the other side" syndrome, or is there some legitimacy to the the stress of client based IT work compared to being an in-house IT guy? Thanks!

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  • Installing an EC2 (EBS based) instance on another AWS account

    - by imaginative
    We're moving from one AWS account to another. I have a couple of EC2 instances I would like to move over. These instances are EBS based. Googling around, I'm seeing all sorts of convoluted answers for how to appropriately launch this EBS based instance on a new account. Surely there has to be a simple way of going about this. As of right now, what I have done so far is backup the EB2 Volume as a snapshot. I then altered the permissions of the snapshot to allow the new AWS account number to be able to access it. I am not sure where to go from here. Do I have to create an image from the EBS snapshot? Upload it to S3? What's the next step(s)?

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  • Prebuilt ActiveMQ Server Based off ZeroMQ

    - by VxJasonxV
    Are there any distributions of fully built Message Brokers that are initially based off of ZeroMQ? I had thought that downloading/installing ZeroMQ would give me such, not just a handful of procedures for rolling me own. Currently we use ActiveMQ, but it is a miserable pain to configure, so I'd rather slim down the profile, unfortunately I learned that ZeroMQ was not a one step solution to achieving that goal. Alternatives are ok, but I'd prefer something less overly verbose in configuration than ActiveMQ's ludicrous amounts of Java configuration. Broker config + Java Logger Config + many other intricacies that I don't wish to deal with. (Read: Preferably not Java based in the first place.) I'm looking for reliable, basic functionality described by JMS brokers. Topics, Queues, Message Persistence, etc.

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  • Routing based on source address in Windows Server 2008 R2

    - by rocku
    Hi, I'm implementing a direct routing load balanced solution using Windows Server 2008 R2 as back-end server. I've configured a loopback interface with the external IP address. This works, I am receiving packets with the external IP address and respond to them appropriately. However our infrastructure requires that traffic which is being load-balanced should go through a different gateway then any other traffic originating from the server, ie. updates etc. So basicly I need to route packets based on source address (external IP) to another gateway. The built-in Windows 'route' command allows routing based on destination address only. I've tried setting a default gateway on the loopback interface and mangled with weak/strong host send/receive parameters on the interfaces, however this didn't work. Is there any way around this, possibly using third party tools?

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  • Web based library management (FOSS) application

    - by pgb
    I'm looking for a FOSS web-based library management application. I want to manage the few books we have at our company, and I'm looking for applications that provide a simple web interface to: Add new books. Search for books. (Not Required) Place holds on books. My ideal would be something like Delicious Library, but web based and open source. I've looked at Koha (which I could not install), Emilda, which seems to be a dead project (last emails are from 2006 and I could not install it) and VuFind which looks awesome but doesn't provide (or I could not find) an interface to add new records to the library. Any suggestions?

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  • Ngnix as reverse proxy for Apache name-based vhosts

    - by Ben Carleton
    I am running several websites on Apache currently utilizing name-based vhosts. All of the sites are on the same server. I would like to add Ngnix on a new server to sit in front of Apache as a caching reverse proxy. What is the best way to handle the multiple name-based vhosts? Should I simply have Nginx handle the names and run each Apache vhost on a separate port? Or is there a way to just have Nginx pass the hostname to Apache and have apache take care of the domain names?

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  • Reputable web based ssh client? [closed]

    - by Doug T.
    I'm connected to a coffee shop's wireless network right now, and I suspected I'd be able to use my laptop and ssh somewhere. Unlucky me they seem to be blocking everything but web traffic (my testing seems to show everything but port 80 is working, can't ping, ftp, etc). I googled "web based ssh clients" however I have reservations about entering my login credentials on any Joe Schmoe's web app. I was wondering if anyone has had any experience with any reputable web based ssh clients? If so could you please point me at one that I could trust?

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  • Deploy virtual PC based on snapshot using Hyper-V

    - by user27786
    I have a server with Hyper-V configured, it is easy to create a new virtual machine using the management tools, but it can take some time. I often see those hosts that say "We can have your server ready in 5 seconds". And I wonder how do they manage this? I would also like to deploy a full functional clean server in 5 seconds. So how is this done? Is it by first installing a clean server, then take a snapshot of that for later to deploy a new server based on that snapshot? I tried doing this, but I did not find any where to install a new virtual machine based on the snapshot. Anyone got any thoughts to share on this?

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  • How can I move a load of zone records from a web based system to text based one?

    - by Chris Adams
    Hi there, I have a few domains with Dreamhost where I have set a load of records using their web based domain name system, and I've like to move them to another provider that lets me enter info directly as a text file for their name server, bind 9 to use. (If you're interested, I'm moving them to Gandi.net). Previously when I used a cpanel based system to do something similar, there was a tool that let me simply enter a domain name, and any available domains were automagically entered into a system, saving me typing it myself (and bringing down sites with silly typos in the process). What open source tool can I use to query a domain for all the relevant subdomains and records and list them in a format like a zone file, that I can use with other name servers?

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  • Excel - Referring to a certain cell based off of data in another

    - by Ethan Brouwer
    I have a spreadsheet where there is one table with the headings: Coordinate, Lat, Long Another with headings Triangle, Coordinate 1, Coordinate 2, Coordinate 3, Area What this is for, is taking the triangles formed by the specified three coordinates' area based off of Girard's theorem, as they are all spherical triangles. I need to take the specific latitude and longitude values from the first table based on the coordinate numbers underneath the three coordinate headings in the second table. I hope this makes sense. Here are pictures detailing what the two tables look like: Table 1 Table 2 Thanks in advance. And I really do hope this makes sense.

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  • WEB based HPC cluster node management

    - by Skuja
    Hello, i am working on my school diploma thesis. The main goal is to create web based application where logged users could see free and busy nodes, turn them on and off, see what process they are running etc. Figured out that i could do something like this - write some cron daemon that would run every 30seconds or so, and it could run ping utility for each node to find out if it is on or off, then write results to some file. Then from my web app (i will write in PHP) i could read the info. Will it be a good solution? How would you suggest me to do it? And finally, is there any existing solutions (it may not be a definetly ewb based) for managment of cluster nodes?

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  • Is there a constraint-based scheduling/calendar application?

    - by wonsungi
    Is there a constraint-based scheduling/calendar application? This application would be used to coordinate multiple people's schedules. Two basic use cases: Multiple people need to schedule a time to meet together. Everyone is busy at different days/times. Each person enters blocks of days/times they cannot meet, and the application suggests the best times to meet given a desired time range. Multiple people need to use some common resources for a specific length of time (over some time span like a week), but the exact date/time does not matter. These people enter the resources and time needed, and the application suggests the best way to share these resources. This use case still accounts for people's blocks of busy time. I imagine this program would be graphical, but other interfaces would be acceptable. Also preferable if web-based/works on both PC's and Mac's, but PC-only/Mac-only solutions are acceptable.

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  • Scheduled task based on Microsoft patch release cycle

    - by floyd
    I have a simple powershell script which unapproves all patches based on computer group name in WSUS which works great. All of our servers patch on a specific Day/Week/Time starting on Week0-Wednesday which would be the Wednesday after Microsoft Patch Tuesday (2nd Tuesday of every month) all the way to Week3-Sunday. This obviously causes problems as sometimes not all patches get applied in one reboot cycle, and then will install patches the following week during their group policy scheduled patching day/time which is what I'm trying to prevent. My question is I'm trying to schedule my script to run based on this schedule and I am finding it next to impossible using Windows Task Scheduler. For instance if I wanted something to always run on the 4th Monday after Microsoft Patch Tuesday, I cant always use the task scheduler option "4th Monday of the Month" Has anyone run into a similar situation, or know of any task scheduling tools which give you more flexibility than Windows Task Scheduler?

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  • Find a Certain Cell based on other Cells in Excel/Calc

    - by user77325
    I have a spreadsheet: Beans B-kg Chips C-kg 1.4oz/12 0.47544 6.5oz/20 3.679 1.48oz/12 0.502608 7oz/12 2.3772 1.86oz/12 0.631656 8oz/20 4.528 and a second sheet: Category Name Case Kg Beans 1.4oz/12 ? Beans 1.48oz/12 ? Chips 6.5oz/20 ? I am trying to match the type of product with the correct weight. So I need a formula that will choose the correct column based on the Category and then choose the correct row based on the name and output the result next to it.

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  • web (server) based password manager

    - by laurens
    Hi all! I know there have been a few topics here about password managers but I read them all and did not really find what I'm looking for. What I'd need is a free or cheap (most password mgr software is $500 for 20+ users, exaggerated!) multi-user password manager, highly preferable web-based so that we can host it on one of our local server, of Hyper-V VM's. So: -free or cheap ( <100$) -multi-user of groups -web based -not very hard to install I tried a few, one very expensive, one I did not get to work- Web Keepass Manager This works with tomcat and probably conflicts with our IIS 7.0 or 7.5 PS: thus, nothing online (!) it has to stay local Thanks in advance!

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  • Puppet: Conditional file source based on naming convention

    - by thinice
    I'm getting the ball rolling on puppet for my environment - and I'd like to have a conditional file resource based on whether or not the module itself contains a file based on a naming convention. So visually, assume a module named 'mysql' and it's layout: mysql/ /files /etc/ my.cnf my.hostname1.cnf my.hostname2.cnf /manifests init.pp ... So I'd like the block to verify if the resource for the module exists or not, and take action accordingly, in pseudo-terms: file { '/etc/my.cnf': if -f 'puppet:///mysql/etc/my.$hostname.cnf' { source => 'puppet:///mysql/etc/my.$hostname.cnf' } else { source => 'puppet:///mysql/etc/my.cnf' } } This way one wouldn't have to manage a csv file or the .pp file with a host specific case statement - is this possible?

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