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  • How to get an inactive RAID device working again?

    - by Jonik
    After booting, my RAID1 device (/dev/md_d0 *) sometimes goes in some funny state and I cannot mount it. * Originally I created /dev/md0 but it has somehow changed itself into /dev/md_d0. # mount /opt mount: wrong fs type, bad option, bad superblock on /dev/md_d0, missing codepage or helper program, or other error (could this be the IDE device where you in fact use ide-scsi so that sr0 or sda or so is needed?) In some cases useful info is found in syslog - try dmesg | tail or so The RAID device appears to be inactive somehow: # cat /proc/mdstat Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md_d0 : inactive sda4[0](S) 241095104 blocks # mdadm --detail /dev/md_d0 mdadm: md device /dev/md_d0 does not appear to be active. Question is, how to make active the device again (using mdmadm, I presume)? (Other times it's alright (active) after boot, and I can mount it manually without problems. But it still won't mount automatically even though I have it in /etc/fstab: /dev/md_d0 /opt ext4 defaults 0 0 So a bonus question: what should I do to make the RAID device automatically mount at /opt at boot time?) This is an Ubuntu 9.10 workstation. Background info about my RAID setup in this question.

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  • Filter MP3s by encoder type?

    - by Brandon
    I'm on a Mac and use iTunes to manage my music collection. I'm in the process of weeding out the lower quality files that I have and would like to have only MP3s that have been encoded using the V0 setting of the LAME MP3 encoder. I tried using iTunes' smart playlist feature but as it only allows a less than rule and V0 is a variable amount, it catches valid V0 encoded files a lot of the time. Is there any alternative program on Mac that I can just point to my iTunes folder and say, "show me all files that are not encoded with LAME V0"?

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  • What parameters to mdadm, to re-create md device with payload starting at 0x22000 position on backing storage?

    - by Adam Ryczkowski
    I try to recover from mdadm raid disaster, which happened when moving from ubuntu server 10.04 to 12.04. I know the correct order of devices from dmesg log, but given this information, I still cannot access the data. The superblocks look messy; the mdadm --examine for each disk is on this question on askubuntu By inspecting the raw contents of backing storage, I found the beginning of my data (the LUKS container in my case) at position 0x22000 relative to the beginning of the first partition in the raid. Question: What is the combination of options issued to "mdadm --create" to re-create mdadm that starts with the given offset? Bitmap size? PS. The relevant information from syslog when the system was healthy are pasted here.

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  • how to see activity logs on a linux pc?

    - by iamrohitbanga
    I want to find out everything possible about the how the pc was used in the past few days. Like who logged in, for how long was the PC was locked and any other information about user activity that is logged on my PC. I know that last command can be used to find out who was logged in and for how long. Any other information that can be found out.

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  • How to securely store and update backup on remote server via ssh/rsync

    - by Sergey P. aka azure
    I have about 200 Gb of pictures (let's say about 1 mb/file, 200k files) on my desktop. I have access (including root access) to remote linux server. And I want to have updateable backup of my pictures on remote server. rsync seems to be the right tool for such kind of job. But other people also have access (including root access) to this server and I want to keep my pictures private. So the question is: what is the best way to keep private files on remote "shared" linux server securely?

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  • Google Chrome suspicious connections

    - by Poni
    I'm using Chrome at Windows and with TCPView (of the SysInternals freeware suit) I see that chrome.exe establish connections to these IPs: 173.194.37.104 209.85.146.138 Using http://www.ipaddresslocation.org/ I check about these IPs and see they're related to Google. Now, in order to clarify, these are the exact things I do: Open up chrome, the default page is set to BLANK (i.e no homepage whatsoever). Then I get into my website which has a blank page, so no "other" http requests are made. Right from this point there is a persistent connection, usually to '173.194.37.104'. What are these?? Very suspicious.. Edit #1: - I'm in 'incognito' mode right from start, when launching Chrome, using a shortcut with the '-incognito' switch. - I've turned off all phishing protections and other "advance" features in order to reduce Chrome's network activity.

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  • Free-flow Alternative to Powerpoint?

    - by Nick Klauer
    So I've been digging around the net trying to find a good set of alternatives to Powerpoint. Part of my interest is that I found one, Prezi, that I liked for it's free-form style. Part of the power of it was that I can zoom out and select any part of the presentation to continue from and it feels much like a mind map or association of thoughts. Are there any other tools that offer anything similar in vein to this way of presenting material? I'm looking for something that just pops differently than a death-by-powerpoint-style presentation, so I would be happy to find tools that help present information in more fluid styles. It doesn't have to mirror Prezi, and I wouldn't want that, but after seeing what Prezi does, I have to think there are other ways of presenting information to a group of people than one square slide at a time.

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  • How to detect/list rogue computers connected to a WIFI network without access to the Wifi Router interface?

    - by JJarava
    This is what I believe to be an interesting challenge :) A relative (that leaves a bit too far to go there in person) is complaining that their WIFI/Internet network performance has gone down abysmally lately. She'd like to know if some of the neighbors are using her wifi network to access the internet but she's not too technically savvy. I know that the best way to prevent issues would be to change the Router password, but it's a bit of a PITA having to re-configure all wifi devices... and if the uninvited guest broke the password once, they can do it again... Her wifi router/internet connection is provided by the telco, and remotely managed so she can log-on to their telco account's page and remotely change the router's Wifi password, but doesn't have access to the router status page/config/etc unless she opts out of the telco's remote support and mainteinance service... So, how could she check if there are guests in the wifi with this restrictions and in the most "point and click way"? In this case I'd probably use nmap to look for other devices in the network, but I'm not sure if that's the easiest way to do it. I'm not a wifi expert, so I don't know if there are any wifi-scanning utils that can tell us who's talking to the router... Lastly, she's a Windows user as I guess that'll influence the choice of tools available Any suggestions more than welcome Regards!

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  • Has anyone had luck running 802.1x over ethernet using the stock Windows or other free supplicant?

    - by maxxpower
    I just wanted to see if anyone else has had luck implementing 802.1x over ethernet. So here's my basic setup. Switch sends out 3 eapol messages spaced out 5 seconds apart. if there's no response the machine gets put on a guest vlan with restricted access. If the machine is properly configured it will authenticate and be placed into a secure vlan. About 10% of my windows xp users are getting self assigned 169 addresses. I've used the Odyssey Access Client and it worked without a hitch. I'm using the setting to automatically use the users windows login to authenticate, but it's workign on 90% of the machines so I don't think that's the issue. Checking the logs on the dc it seems that the machines are trying to authenticate with computer credentials even though they are configured not to. I'm running Juniper switches with IAS for radius. I have radius configured for PEAP and MSvhapv2. Macs and linux boxes seem to have no issues authenticating. One last thing to add If I unplugging the ethernet cable and plug it back in usually resolves the issue, but I'd hardly call that acceptable for production. Kinda long winded and specific for a discussion, but just want to see if anyone else has had similar issues or experiences, or if anyone knows of a free XP supplicant that actually works with 802.1x over ethernet.

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  • Setting up Shibboleth to secure part of a website

    - by HorusKol
    I've installed the Shibboleth module for apache on Ubuntu 10.04 using aptitude to install libapache2-mod-shib2 as per https://groups.google.com/group/shibboleth-users/browse_thread/thread/9fca3b2af04d5ca8?pli=1 and enabled the module (I have checked in /etc/apache2/mods-enabled) I then proceeded to secure a directory on the server by placing a .htaccess file with the following directives: AuthType shibboleth ShibRequestSetting requireSession 1 Require valid-user Now - I haven't set up an SSL host yet - and I also haven't set up the IdP - but I would expect that the server would block access to this directory - but I'm getting the content without any problems. I have restarted the apache service and I have no errors in the log files.

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  • May the file size returned by stat be compromised?

    - by codeholic
    I want to make sure that nobody changed a file. In order to accomplish that, I want not only to check MD5 sum of the file, but also check its size, since as far as I understand this additional simple check can sophisticate falsification by several digits. May I trust the size that stat returns? I don't mean if changes were made to stat itself. I don't go that deep. But, for instance, may one compromise the file size that stat returns by hacking the directory file? Or by similar means, that do not require superuser privileges? It's Linux.

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  • Which ports to open on domain vs internet

    - by zsharp
    I have a web server/database/domainController. I notice that ports 137 and 138 on the public IP AND private IP are open on all machines there are also other open ports on 0.0.0.0.(ie. 135, 2002) Can and should I close 137-139 on the public IP only? will that interfere with any services.

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  • hosts.deny not working

    - by Captain Planet
    Currently I am watching the live auth.log and someone is continuously trying the brute force attack for 10 hours. Its my local server so no need to worry but I want to test. I have installed denyhosts. There is already an entry for that IP address in hosts.deny. But still he is trying the attacks from same IP. System is not blocking that. Firstly I don't know how did that IP address get entered in that file. I didn't enter it, is there any other system script which can do that. hosts.deny is sshd: 120.195.108.22 sshd: 95.130.12.64 hosts.allow ALL:ALL sshd: ALL Is there any iptable setting that can override the host.deny file

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  • How to handle user accounts for many sites running on same server

    - by Simon Courtenage
    Background to this question: I want to host multiple e-commerce sites on the same server, each with their own separate customer login application. Each site's login application needs to be secured by SSL. I'm unsure how best to handle this. For example, do I need to acquire a separate SSL certificate for each site (in which case, how do I do this dynamically, as the sites are created), or do I handle this using ONE login gateway-style application, which handles it on behalf of all the sites via a kind of transparent redirect? I'd be grateful for any pointers or advice. Thanks.

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  • How do I disable administrator prompt in Windows 8?

    - by Arnold Zokas
    I am using Windows 8 Enterprise on my development machine. Most of the time, I need full administrator for debugging, changing system files, etc. In Windows 7, setting UAC to "never notify" would disable any administrator prompts. In Windows 8 this is no longer the case. Even with UAC disabled I get prompted to grant programs elevated privileges. Is there a way disable this behaviour? Note: I am fully aware of the repercussions. I have antivirus, firewall, etc and am generally quite careful about what I download or install on my machine.

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  • Prevent registry changes by users

    - by graf_ignotiev
    Background: I run a small computer lab of 10 computers using Windows 7 x64 Enterprise. Our users are set up as limited users. For additional restrictions, I set up local group policy for non-administrators using the microsoft management console. Problem: Recently, I found out that some of these restrictions had been removed. Reviewing the settings MMC and in ntuser.pol showed that the settings should still be in place. However, the related registry settings were missing in ntuser.dat. I already have registry editing disabled in the GPO (though not in silent mode). Question: What is the best way to deal with this situation? Should I look into preventing registry setting changes? Should I set up registry auditing to found out how these keys are getting changed in the first place? Or should I give up the ghost and write some kind of logon script that enforces registry values if they've been change? Any other ideas?

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  • Securing ColdFusion for internet facing server

    - by Goyuix
    What do I need to do to tighten down a ColdFusion server for internet facing apps? The only thing that specifically came to mind was to restrict the CFIDE and JRunScripts directories to a local subnet. Are there settings in the administrator I can tweak to make the applications more secure?

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  • How to close the logon process named NtLmSsp ?

    - by Aristos
    I have a windows 2003 server and time to time I am getting many login failures like this one. Logon Failure: Reason: Unknown user name or bad password User Name: administrator Domain: xx.xx.xx.xx Logon Type: 3 Logon Process: NtLmSsp Authentication Package: NTLM Workstation Name: XLHOST Caller User Name: - Caller Domain: - Caller Logon ID: - Caller Process ID: - Transited Services: - Source Network Address: 173.45.70.100 <- hacker Source Port: 4722 AND Logon attempt by: MICROSOFT_AUTHENTICATION_PACKAGE_V1_0 Logon account: user Source Workstation: XLHOST Error Code: 0xC0000064 The question is, how can I close this process of login ?, what I have left open and some one can try to login ? Some notes: I login to the server using tunneling, nothing is open except dns, email, and web ports, not even ftp, and all default ports are change and hidden. I also monitor port scan and capture any one that try to find the hidden ports. Probably it is something open... Thank you in advanced.

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  • PostgreSQL encrypted backups

    - by Nikhil Gupte
    Is it possible to ensure that dumps taken from a PostgreSQL db are always encrypted? The data in the database is highly sensitive and we cannot afford un-authorized personnel, including Sys Admins who need to backup the db, to access the actual data.

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  • password protect a VPS account?

    - by Camran
    I ordered a VPS today, and am about to upload my website. It uses java, mysql, php etc... However, I need to password protect the site at first... I use Ubuntu 9.10 and have installed LAMP just now. How can I easiest do this? Thanks PS: Have problem with the serverfault website, thats why I am posting this here. sorry.

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  • Can I build a VPN on top of Tor?

    - by Thilo
    If I understand correctly, the Tor client works as a combination of a proxy server and application plugins (such as the Firefox Torbutton) that enable use of the proxy and contain additional application-specific privacy features (such as suppressing cookies, sandboxing JavaScript, turning off Flash). That works very well with applications that support it (such as Firefox). But is there a way to establish a VPN over Tor, so that my whole Wifi network can be protected, including applications that do not support proxy configuration and devices like iPod touches?

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