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  • Creating own Amazon Machine Image - Kernel panic

    - by amra
    I have created own AMI and registered it on Amazon EC2. But while AMI startup I receive following error: Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(8,1) The image is running locally without any problems. fstab contains: proc /proc proc defaults 0 0 /dev/sda1 / ext3 relatime,errors=remount-ro 0 1 thx for help

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  • cset shield --kthread on: should I use this?

    - by lori
    I'm reading up on cpu shielding using Alex Tsariounov's cset utility here: https://rt.wiki.kernel.org/index.php/Cpuset_Management_Utility/tutorial In the tutorial I'm finding the wording around migrating kernel threads from having access to all cpus to running only in a certain cpuset a bit ambiguous The tutorial says the following: Some kernel threads can be moved into the unshielded system cpuset as well. These are the threads that are not bound to specific CPUs. If a kernel thread is bound to a specific CPU, then it is generally not a good idea to move that thread to the system set because at worst it may hang the system and at best it will slow the system down significantly. These threads are usually the IRQ threads on a real time Linux kernel, for example, and you may want to not move these kernel threads into system. If you leave them in the root cpuset, then they will have access to all CPUs. The tutorial then goes on to say: However, if your application demands an even "quieter" shield, then you can move all movable kernel threads into the unshielded system set with the following command. [zuul:cpuset-trunk]# cset shield -k on cset: --> activating kthread shielding cset: kthread shield activated, moving 70 tasks into system cpuset... [==================================================]% cset: done I am confused by this final sentence. By using the word however, it seems to suggest that you typically should not move the movable kernel threads into the unshielded system set. Is this the case, or is it safe to move kernel threads which can be moved into a cpuset, thereby preventing them from running on some cpus?

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  • can i use an ip-list include file for iptable blacklisting

    - by rubo77
    I would like to block all countries except mine in iptables, that is a lits with about 100.000 Entries. how can i define this blacklistfile in a script, so iptables blocks all those ip-ranges? maybe i can use http://www.ipdeny.com/ipblocks/data/countries/ that provides lists in the form 117.55.192.0/20 117.104.224.0/21 119.59.80.0/21 121.100.48.0/21 ... i want to be able to change the blacklistfile easily without having to change the iptables-script

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  • How do you protect your <appid>.appspot.com domain from DDOS attack?

    - by jacob
    If I want to use CloudFlare to help protect my GAE app via it's custom domain, I still am vulnerable to attacks directly on the .appspot.com domain. How do I mitigate that? I could force redirect appspot.com host requests, such as discussed here: http://stackoverflow.com/questions/1364733/block-requests-from-appspot-com-and-force-custom-domain-in-google-app-engine/ But I would still suffer the load of processing the redirect in my app. Are there any other solutions?

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  • Nginx SSL redirect for one specific page only

    - by jjiceman
    I read and followed this question in order to configure nginx to force SSL for one page (admin.php for XenForo), and it is working well for a few of the site administrators but is not for myself. I was wondering if anyone has any advice on how to improve this configuration: ... ssl_certificate example.net.crt; ssl_certificate_key example.key; server { listen 80 default; listen 443 ssl; server_name www.example.net example.net; access_log /srv/www/example.net/logs/access.log; error_log /srv/www/example.net/logs/error.log; root /srv/www/example.net/public_html; index index.php index.html; location / { if ( $scheme = https ){ rewrite ^ http://example.net$request_uri? permanent; } try_files $uri $uri/ /index.php?$uri&$args; index index.php index.html; } location ^~ /admin.php { if ( $scheme = http ) { rewrite ^ https://example.net$request_uri? permanent; } try_files $uri /index.php; include fastcgi_params; fastcgi_pass 127.0.0.1:9000; fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name; fastcgi_param HTTPS on; } location ~ \.php$ { try_files $uri /index.php; include fastcgi_params; fastcgi_pass 127.0.0.1:9000; fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name; fastcgi_param HTTPS off; } } ... It seems that the extra information in the location ^~ /admin.php block is unecessary, does anyone know of an easy way to avoid duplicate code? Without it it skips the php block and just returns the php files. Currently it applies https correctly in Firefox when I navigate to admin.php. In Chrome, it downloads the admin.php page. When returning to the non-https website in Firefox, it does not correctly return to http but stays as SSL. Like I said earlier, this only happens for me, the other admins can go back and forth without a problem. Is this an issue on my end that I can fix? And does anyone know of any ways I could reduce duplicate configuration options in the configuration? Thanks in advance! EDIT: Clearing the cache / cookies seemed to work. Is this the right way to do http/https redirection? I sort of made it up as I went along.

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  • How to stay connected on remote desktop even if different user tries to connect

    - by Darqer
    I'm logging through Remote Desktop to windows 7. Some other users sometimes try to connect to the same computer, then a message box pops up with information that I have 30 seconds to block this try or I will be logged off. Sometimes I'm away and then I'm being logged off and when I come back I have to log on again. Is there a way to turn off this functionality for single user. Is there some application that always breaks this login process ?

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  • Samba deny host not blocking that host

    - by datadevil
    I want to block access to some Samba shares from a certain machine, but somehow I can't get it to work: the machine can still access the shares, and I did restart and reload the samba daemon. Here is a part of my configuration: security = share hosts allow = 127.0.0.1 192.168.1.0/24 interfaces = 127.0.0.1 eth1 192.168.1.2 bind interfaces only = yes hosts deny = 192.168.1.251 encrypt passwords = yes guest ok = yes The shares themselves look like this: [examples] comment = Example path = /foo/bar read only = No guest ok = yes What am I doing wrong here?

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  • Timestamp Updating Constantly on /dev/null

    - by motorleague
    I've been working on a problem with a /dev/null file on an AIX system (just for background it looks as though it was inadvertently deleted and recreated as a normal file by somebody), but in trying to determine what caused the problem, I noticed that the timestamp on it seems to update every minute. I've observed this on several AIX servers at my workplace. At present I can't entirely rule out this be something specific to the Application being used at my workplace, so I compared with CentOS and Debian based computers at home last night. The CentOS box, which runs 24 hours, had a mod time on /dev/null of around 4 days ago (during which time it was essentially just being used as a web browser and multimedia player, although it would have had active but essentially unused Apache, MySQL and VMM processes running in the background). The timestamp on /dev/null on the Debian machine, which was a just booted laptop, pretty much reflected the boot time, but I tested redirecting STDIN from, and STDOUT to it, and the modification time was unchanged (I'm not sure 100% sure if directing data to /dev/null constitutes "writing to it" in the way it would a normal file). So my question is essentially, could anybody please offer any advice with regards to what circumstances (permissions changes etc.. aside) might cause the timestamp on /dev/null to update? Thanks very much for any suggestions. Alex.

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  • Lightweight ad-blocker for firefox

    - by student
    On a old machine (512 MB RAM) I am currently running ubuntu jaunty and firefox 3.0.15. I tried the ad blocker addon add block plus but it eats lots of RAM (300 MB). Is high memory load of this add-on a bug, which is fixed in a newer version or just normal? If so, why is the memory usage so high? Is there another ad blocker add-on for firefox or another browser- add-on combination for linux (ubuntu jaunty) which uses significant less RAM?

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  • Creating a whitelist for RDP access

    - by Tgys
    Since people are getting unauthorized access to my Windows Server (bruteforced over several months..), I'd like to set up a whitelist for RDP access. I have tried the following with Windows Firewall inbound rules: This still allows other users to connect through RDP. Is there any way to block such unauthorized access through a whitelist? EDIT: The firewall is enabled, and it's the only firewall running on the machine. Rules like allowing port 80 traffic behave correctly.

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  • smtp(s) proxy to monitor outgoing spam

    - by Zulakis
    I am looking for a smtp proxy to install on our gateway which should monitor outgoing smtp traffic to identify the source of recently occuring spam attacks from our network. It would be enough if this could log all outgoing mails, no actual filtering must be done as I'm going to do this manually. Also, is it possible to monitor smtps ports 465 and 587 or is it necessary to completely block these ports to stop spam?

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  • Sygate personal firewall causing trouble

    - by sabo
    Since some reinstalls my Sygate Personal Firewall is beginning to make trouble: It loooves to fully block/extremely delay POST HTTP requests and some random sites in general. It slows everything down, generally Reinstall doesn't work. What could cause the problem? Is there a really leightweight firewall as an alternative out there? Thanks

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  • Preventing 304 Not Modified Requests with nginx

    - by ustun
    I am running nginx, and have the following block for expiration: expires 52w; However when I use Google Chrome Developer Tools to observe network traffic, some of the assets are loaded from cache (200-from cache) while most of the assets are making a request to the server (304 Not Modified). I want to load all assets from cache without communicating with the server if possible. (200-from cache) What would be the required change in my nginx configuration?

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  • Response code for Chinese spiders? [closed]

    - by pt2ph8
    My server is being "attacked" by Chinese spiders that don't respect the rules in my robots.txt. They are being very aggressive and using a lot of resources, so I'm going to set up some rules in nginx to block them by user agent. Question: which response code should I return, 403, 444 (empty response in nginx) or something else? I'm wondering how the spiders will react to different status codes. What's the best practice?

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  • Is there a way to get Apache to blank sensitive data from logs?

    - by i..
    We're trying to clean up one of our systems as much as possible & have found that despite our attempts to block, users are accessing a certain part of our system through a HTTP GET with their password in the URL. This results in our Apache logs recording their password in plain text on the server. Is there an Apache directive or module that can filter out (or replace) certain patterns in its logs?

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