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  • rhel configure: limit root direct login to systems except through system consoles

    - by zhaojing
    I have to configure to limit root direct access except system consoles. That is, the ways of telnet, ftp, SSH are all prohibited. Root can only login through console. I understand that will require me to configure the file /etc/securetty. I have to comment all the tty, just keep "console" in /etc/securetty. But from google, I found many peoples said that configure /etc/securetty will not limit the way of SSH login. From my experiment, I found it is. (configure /etc/securetty won't limit SSH login). And I add one line in /etc/pam.d/system-auth: auth required pam_securetty It seems root SSH login can be prohibited. But I can't find the reason: What is the difference of configure pam_securetty and /etc/securetty? Can anyone help me with this? Only configure /etc/securetty could work? Or Have I to configure pam_securetty at the same time? Thanks a lot!

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  • How to force disconnect users from a box?

    - by LikeToCode
    how do you disconnect an active user logged in to a box? There should be a command line tool that comes with Windows, but I forgot it's name. It lists all the users logged in to a box and you can force disconnect of some, because, for example, you want to Remote Desktop to it and there's too many users.

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  • Windows diagnostic tools

    - by Tathagata
    I just joined a small computer lab which basically uses all Windows boxes and a few Windows Sever 2003. Coming from a *nix background I am missing all the nice tools that we have for diagnosis and troubleshooting. My question is what are the safe, free (not terribly concerned if it is like beer or freedom -both acceptable) tools out there that Windows system admins use for their day to day troubleshooting (network, applications, servers etc). I am aware of the tools that come with Windows (and their limited capabilites) - so my query is with what do you fill in your arsenal? (may be a list of win versions of tools that come in standard linux distros)

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  • Mac OSX Programming for long time Linux geek

    - by DarenW
    I've written software on Linux since 1995 but must get up to speed with app development on the Mac. I have no experience on that platform. Obviously I should get my hands on some appropriate hardware. What are good books, tutorial websites, and other resources for experienced devs getting started on Mac? Not just APIs and app internals, but also including how does one install an app, debug it, etc?

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  • How should a small company administer their web server?

    - by John Isaacks
    We currently have our website hosted by a small company that is actually a reseller for Rackspace. They act as our server administrators. They configured the servers, handle the backups, if there is a problem, we call them and they fix it. We are growing and want to move away from our shared server to either a cloud or dedicated server. I am thinking cloud myself but I am open to either. The current company doesn't seem to want to offer us anything more than a shared hosting plan. I looked into cloud solutions at vps.net, with them I would have to be the server administrator myself. I am the website programmer but administering the server is outside my comfort zone. vps.net does have a $99/month plan for Pro-Active Managed Support but I am not sure if this is the equivalent on a server admin that is there when you need them. We could hire someone in house, but I think that would be overkill for our needs. I am not exactly sure what we need, I do know we need as close to 100% uptime as we possible can. and we need the ability to add/remove/change the server configuration/software/etc. when needed (though changes shouldn't be very often once everything is setup right). Can someone point me in the right direction? What do other companies do?

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  • How does virtualization improve server utilization?

    - by Continuation
    The biggest benefit of virtualization is usually said to be improved server utilization. But why do I need virtualization for that? Say I got N physical servers that are lightly used. Why don't I just combine all the apps on those N servers into 1 physical server? This way I don't incur the performance penalty of virtualization. What does virtualization buy me in this case?

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  • Are there any well known anti-patterns in the field of system administration?

    - by ojblass
    I know a few common patterns that seem to bedevil nearly every project at some point in its life cycle: Inability to take outages Third party components locking out upgrades Non uniform environments Lack of monitoring and alerting Missing redundancy Lack of Capacity Poor Change Management Too liberal or tight access policies Organizational changes adversely blur infrastructure ownership I was hoping there is some well articulated library of these anti-patterns summarized in a book or web site. I am almost positive that many organizations are learning through trial by fire methods. If not let's start one.

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  • What kind of proxy acl rules should be applied?

    - by user42891
    I try to block sites in squid based on this article. Assuming you would want to block access to Yahoo (e.g http://www.yahoo.co.jp, http://www.yahoo.com, http://www.yahoo.co.in), you would ideally want to block all of the above URLs, if I use a regular expression and try to search something called yahoo it seems to get blocked. We are just interested in applying rules which would be most commonly used across all companies (e.g. social networking sites like facebook, orkut), porn sites (e.g. sex), gaming sites (games), movie & song download sites, and sites where they can upload data (e.g. rapidshare) What would be the common set of effective rules in achieving the above?

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  • Access denied errors in windows server 2008 for system administrator

    - by NLV
    Hello I've a HP Pavilion DV4 with windows Server 2008 R2 enterprise. My system is connected to a domain. I login using my domain account. I am the administrator for the local machine. But I'm getting access denied everywhere (file system, running commands, using visual studio..literally everywhere..) in my machine. What could be the problem? Any ideas? Please tell me if you need more information as I'm just a developer with less knowledge in system administration.

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  • How to speed up request/response to django using apache or another solution?

    - by jbcurtin
    Hey all, I'm mainly a developer, but every now and again I jump into the sys-admin position. For the most part I've gotten away with deploying php and python apps using apache. I write today because I'm starting to research faster alternatives to apache, yet still have some of the core features I require like put and delete methods and the ability to connect to a socket via apache. ( This I have not tried, but might be a nice whistle if I ever employ comet on my apps. ) As you've probably guessed, I use javascript exclusively for all my websites utilizing deep linking for SEO support. The main areas that I'm looking to increase performance is the connection between the django apps and the web server to the client response. Every day I work my best to keep the smallest memory foot print as possible, however I am getting to the end of my rope when it comes to working with apache. In general, keep in mind that I'm just starting this research so I'm looking more for material to read then solutions at this moment. My main questions: Am I missing something about apache that makes it faster then everything else? What would be a good server environment to deploy just static files one? What are some of the leading open-source and paid alternatives?

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  • Freelance for moderately complex admin support

    - by ongraphs
    Mailing lists and question/answers works great for problems that are independently encountered by several people. But sometimes we (as in experienced amateurs) run into problems that aren't so common, nobody has blogged about it and experts advice not readily available. For IT-admin related stuff can someone please recommend how can amateurs pay experts and get hands on advice. The kinds of problems I am talking about are like setting up nxserver or openvpn on freeBSD box. The install/config is not so simple, the documentation not easy for non-it professionals. Therefore getting step by step advice would be quite helpful. Thanks sandeep

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  • Limit a process's relative (not absolute) processor consumption in Linux

    - by BobBanana
    What is the standard way in Linux to enforce a system policy to limit the relative CPU use of a single process? That is, on a quad-core machine, I never want a process to use more than 2 CPUs at once, even if the process creates more threads. I do not want an absolute time limit, just a relative limit so that one task cannot dominate the machine. This is also different than renice, which allows a process to use all the resources but just politely step aside if others need them too. ulimit is the usual resource limiting tool, but it does not allow such CPU restrictions.. it can limit the number of processes per user, or absolute CPU time, not restrict the maximum number of active threads of a single process. I've found a couple of user-level tools, like CPUlimit, but not a system level tool or setting. Does such a standard resource controller exist in Linux (Red Hat Enterprise, if it matters.) If there is such a limit imposed, how would a user identify it?

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  • How to change log rotate Extension..???

    - by Jayakrishnan T
    Hi all, currently my logrotate configuration adds a single number after the rotated log file: mylogfile.log is rotated to mylogfile.log.1 I would like to change the extension to mylogfile.log.Current date does anyone know a way to do this? my log rotate code is :- /usr/local/jboss/jboss-3.2.7-ND1/server/default/log/consolelog.log { copytruncate rotate 1 missingok notifempty } Currently am renaming the rotated file with script.is there any option to change the extension of log rotate default configuration. Please help me

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  • Remove some junk characters from server console log.

    - by Jayakrishnan T
    Please look in to the picture,here am trying to open(with vi editor) my server console log file(around 100MB) and it takes more than two minutes to open with so many special characters.after deleting the first line (means typing "dd")then i can easily view the file and size of the file is also reduced very much.My server OS is RHEL 5.4 and jboss is running in to it. Please help me to avoid such junk characters coming to my server console log files and it helps me to save my valuable space in server.

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  • Mails are coming from mail server to my account automatically...???

    - by Jayakrishnan T
    Hi all, i am getting same mail from admin account of my mail server every day automatically.The content of the mail is given below. Click here to access your spam quarantine. The spam quarantine contains emails that are being held from your email account. Quarantined emails can be released to your inbox or deleted using the spam quarantine link. Please give me an advice to solve this problem.

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  • Why would my domain admins turn of UAC?

    - by DanO
    I'm a developer of internal software in our company, I've gotten used to UAC in Win7, I prefer to run with in enabled so that our software works correctly with it enabled. Sysadmins have recently pushed out GPO that turns it off every time we log-in. (So I turn it back on every time I log in.) I can imagine some people are annoyed by it and turn it off, but is that really a good company-wide decision? anyone annoyed by it (local admins) would already have permission to turn it of themselves.. right? On the other hand we don't have to worry creating UAC friendly software if no workstations or servers have it enabled. Is there a good reason for doing this? Other than reducing help-desk calls from recent XP users? I can't see the upside of this decision, help me understand.

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  • Sticking with Ubuntu 12.04 while heavily using PPA for newest software updates (Apache 2.4, PHP 5.5)

    - by MechaStorm
    I was wondering whether is it worthwhile to stick with Ubuntu 12.04 LTS until 14.04 comes or should I be switching to just the latest Ubuntu server version 13.10. My server needs are not enterprise heavy and previous thought to keep with LTS was simply to gain the security updates without having to upgrade the servers every couple months. But as we are moving forward with our software development, I have found that alot of the default version of software with 12.04 is way out of the date forcing me to up date via PPA or from source instead of from default apt-get. ie PHP 5.3 is on 12.04, and I'd like to get it to 5.5. Is it worthwhile to simply move to 13.10 in that situation? With the idea to move to 14.04 when it comes?

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