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  • GRUB2 not detecting OS on raid partitions

    - by sleeves
    I have recently added a drive to a system and have successfully raid'ed (RAID-1) the paritions, with the exception of the boot partition. I have it ready and mirrored, but can't get GRUB2 (update-grub) to find it. System: Ubuntu 11.04 Raid Metadata: 1.2 If I run update-grub, it finds the kernel images on the /dev/sda2 partition (present root) but not the images on /dev/md127. /dev/md127 is composed of "missing" and "/dev/sdb2". fdisk on /dev/sdb confirms that sdb2 is of type fd (raid autodetect) and is also flagged bootable. I have two things I want to do. Make the boot.cfg on /dev/sdb2 have a menu option to have the root be /dev/md127 Install grub onto /dev/md127 so the actual boot.cfg from there is being used. Thanks!

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  • File permissions on web server

    - by plua
    I have just read this useful article on files permissions, and I am about to implement a as-strict-as-possible file permissions policy on our webserver. Our situation: we have a web server accessed through sftp by different users from within our company, and we have the general public accessing Apache - sometimes uploading files through PHP. I distinguish folders and files by their use. So based on this reading, here is my plan: All people who need to upload files will have separate users. But all of those users will belong to two groups: uploaders, and webserver. Apache will belong to the group webserver. Directories Permission: 771 Owner: user:uploaders Explanation: to access files in the folder, everybody needs to have execute permission. Only uploaders will be adding/removing files, so they also get r+w permission. Files within the web-root Permission: 664 Owner: user:uploaders Explanation: they will be uploaded and changed by different users, so both owner and group need to have w+r permissions. Webserver needs to only read files, so r permission only. Upload-directories Permission: 771 Owner: user:webserver Explanation: when files need to be uploaded, Apache needs to be able to write to this directory. But I figure it is safer to change the owner to webroot, thus giving Apache sufficient privileges (and all uploaders also belong to this group and will have the same permissions), while safeguarding from "others" writing to this folder. Uploaded files Permission: 664 Owner: user:webserver Explanation: after uploading Apache might need to delete files, but this is no problem because they have w+r permission of the folder. So no need to make this file any more accessible than r access for group. Being not an expert on file permissions, my question is whether or not this is the best possible policy for our situation? Any suggestions welcome.

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  • Tool to allow Kerberos Authenticated users to modify Firewall settings

    - by Lars Hanke
    I run a firewall on a central router. Recently, several users want to use Skype. Since firewalling Skype virtually means to switch the firewall off, I consider to allow users to temporarily punch holes for their system. Since the users have no accounts on the router, I consider using Kerberos for authentication and authorization. The router is a Debian Squeeze box, with minimal configuration, i.e. no web-server, database or similar gimmicks. Does anyone know an existing solution, which could be used for that purpose? Or does anybody know easy to use and well documented frameworks in say Perl, Python, C, C++, ... making the set-up of a Kerberos authenticated Client and Server application really simple?

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  • sudoer scheme to allow useful access to another web developer yet retain future control of a virtual

    - by Tchalvak
    Background: Virtual Private Server I have a virtual private server that I'm looking to host multiple websites on, and provide access to another web developer. I don't care about putting too many constraints on him, though I wouldn't mind isolating the site that he'll be developing from other sites on the server that I will develop. The problem: retain control Mainly what I want is to make sure that I retain control over the server in the future. I want to reserve the ability to create/promote/demote and other administrative functions that don't deal with web software. If I make him an admin, he can sudo su - and become root and remove root control from me, for example. I need him not to be able to: take away other admin permissions change the root password have control over other security/administrative functions I would like him to still be able to: install software (through apt-get) restart apache access mysql configure mysql/apache reboot edit web development configuration type files in /etc/ Other Standard Setups would be happily considered I've never really set up a good sudoers file, so simple example setups would be very useful, even if they're only somewhat similar to the settings that I'm hoping for above. Edit: I have not yet finalized permissions, so standard, useful sudo setups are certainly an option, the lists above are more what I'm hoping I can do, I don't know that that setup can be done. I'm sure that people have solved this type of problem before somehow, though, and I'd like to go with something somewhat tested as opposed to something I've homegrown.

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  • Listing packages in a repositiory?

    - by noloader
    I'm working on Ubuntu 12.04 Server. I want to install OpenStack, so I enabled the Cloud Archive repo: sudo add-apt-repository cloud-archive:havana After the subsequent update and upgrade, I noticed python-crypto changed. python-crypto recently fixed a CVE, so I would like to ensure I'm using the patched version of python-crypto. I'd also like to compare the python-crypto in both Ubuntu and Cloud Archive. How does one list the package information for both Ubuntu::python-crypto and CloudArchive::python-crypto? (And sorry I could not tag this with apt-cache. Its not available in the list of tags). Thanks in advance

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  • How to decrease size of KVM virtual machine disk image

    - by Cerin
    How do you decrease or shrink the size of a KVM virtual machine disk? I allocated a virtual disk of 500GB (stored at /var/lib/libvirt/images/vm1.img), and I'm finding that overkill, so now I'd like to free up some of that space for use with other virtual machines. There seems to be a lot answers on how to increase image storage, but not decrease it. I found the virt-resize tool, but it only seems to work with raw disk partitions, not disk images.

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  • Cannot Login as root

    - by Josh Moore
    At my work we ship our product on pre-installed servers as a software/hardware package. We are using open SUSE 10.3 for the OS and we setup and we always log in with the root user to do maintenance on the box. Recently we just had box returned to us that the customer said the could not longer connect to the box through the network interface. So when I started to work on the box I run into the this problem: At the command prompt to login i type the user name "root" and hit enter. Then even before it asks me for a password I get "Login incorrect". I have never seen this behavior before and could not find any information about it online. Does anybody know what is going on? Thanks.

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  • grep + sed for find & replace fun!

    - by Jim Greenleaf
    I have a dev copy of a website set up that has quite a few hardcoded references to its live counterpart. I would like to replace all occurrences of "www." with "dev." in all files. I think I can use a combination of grep + sed, but I'm not sure how.

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  • Launch script after SFTP disconnect

    - by Mates
    I'm currently using Caja (basically the same as Nautilus) to connect using SSH to my server and work with files. What I'm looking for is a way to launch a simple script when I disconnect - I can launch a script after disconnecting from the TTY by putting it into ~/.bash_logout file, but that is not executed when disconnecting from a file manager. The only idea I have is to set up a cronjob which would be checking for existing sftp-server or sshd processes periodicaly and launched the script when there's no such process running. Is there any easier way to do this?

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  • forward outbound traffic rule

    - by Claudiu
    I am trying to forward the outbound traffic to another server. Current rule is: /sbin/iptables -A OUTPUT -p tcp -s localhost -o 91.xxx.xxx.xxx --dport 65000:65010 -j ACCEPT but when I do a iptables -L, the rule its showed like this: ACCEPT tcp -- localhost.localdomain anywhere tcp dpts:65000:65010 So I guess my rule is bad written since the "destination" column shows "anywhere" Can you help me with this?

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  • RHEL 6.5 and LDAP

    - by zuboje
    I am trying to connect our Active directory server to brand new RHEL 6.5 server. I want to authenticate users using AD credentials, but I want to restrict that only certain users can login, I don't want to allow anybody from AD to connect to it. I would like to use something like this: CN=linuxtest,OU=SecurityGroups,DC=mydomain,DC=local but I am not sure how would I setup OU and CN. I use sssd for authentication and my id_provider = ad. I wanted to use id_provider = ldap, but that did not work at all and RHEL customer service told me to setup this way. But I want to have a little bit more control who can do what. I know I can use this to restrict simple_allow_users = user1, user2, but I have 400+ users, I really don't want to go and type them all. Question is how would I setup OU or CN for my search?

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  • BIND having trouble resolving service.graphicly.com

    - by Keith Burgoyne
    Since about two weeks ago, we haven't been able to resolve service.graphicly.com: dig @192.168.0.12 service.graphicly.com ; <<>> DiG 9.3.4-P1 <<>> @192.168.0.12 service.graphicly.com ; (1 server found) ;; global options: printcmd ;; connection timed out; no servers could be reached Digging on the name servers listed for graphicly.com shows that service.graphicly.com is a CNAME to takecomicsadmin.cloudapp.net. Digging on cloudapp.net's name servers seems to fail: dig @NS1.LIVEDNS.MSFT.NET takecomicsadmin.cloudapp.net ; <<>> DiG 9.3.4-P1 <<>> @NS1.LIVEDNS.MSFT.NET takecomicsadmin.cloudapp.net ; (1 server found) ;; global options: printcmd ;; connection timed out; no servers could be reached Somehow, my home ISP's name servers can resolve service.graphicly.com without issue. Has anyone else noticed this problem? Does anyone know what the cause of this problem could be? Thanks!

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  • Upgrade CentOS 5.2 to 5.3 -- but not 5.4

    - by Jeff Leyser
    Server currently running CentOS 5.2. Developers tell me they'd like the machine upgrade to CentOS 5.3 -- but not all the way to CentOS 5.4, as they haven't tested with 5.4 yet. I'm pretty sure a yum upgrade will put me at 5.4, as a yum check-update shows all sorts of 5.4 packages. So how do I move up to 5.3?

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  • How to stop LDAP authentication in ubuntu?

    - by Kery
    My OS is Ubuntu 12.04 and use LDAP authentication. Now I meet a problem that another people want to access my system. But he is in another domain so he can't login. And I have no right to change this configuration in LDAP server. So I have to choose a workaround to solve this problem, for example close the LDAP authentication and use local authentication (I have root right in my system) or create another account which is not registered in LDAP server (I did this but can't change the created account password. The error is 'password reset by root is not supported'). Of course any other suggestion is appreciated! Than you in advance!

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  • Server market shares

    - by Bill Gray
    here can I find somewhat reliable indications of server market shares, without having to fork out $$$$$ for IDC or Gartner reports? I have considered the W3 statistics, net applications etc, and these are not what I would consider reliable. Is there anything more, that is free?

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  • Setting up a transparent proxy with only one box.

    - by Scott Chamberlain
    I am playing around with transparent proxies, unfortunately I do not have two machines to test it out with. The current way I am doing things is the program makes a request to a computer on port 80, I use iptables -t nat -A OUTPUT -p tcp --destination-port 80 -j REDIRECT --to-port 1234 to redirect to my proxy that I am playing with. the proxy will send out a request to port 81 (as all outbound port 80 are being fed back in to the proxy so I want to do something like iptables -t nat -A OUTPUT -p tcp --destination-port 81 -j DNAT --to-destination xxxx:80 The problem lies with the xxxx part. How do I change the destination port without changing changing the destination ip? Or am I doing this setup completely wrong, I am learning after all and constructive criticism is definitely appreciated. The machine I am using is pretty low end so I would like not not have to create a VM with a second box unless absolutely necessary.

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  • Two distinct mount points with one device

    - by user1761555
    After being disappointed with Ubuntu's release update feature, I finally decided to have separate mount points for / and /home. Towards this, I reformatted my HDD giving most of my drive to sda1(meant to be /home) and allocated about 40GB to rootfs (/). Unfortunately, I would also like to have a /projects which is to be located on sda1. Currently, sda1 is being mounted as /dev/sda1 on /home type ext4 (rw) I've tried looking online for a solution to this problem..however, I'm not sure as to what to look for! Is it possible to mount the 'home' directory of sda1 as /home and 'projects' directory of sda1 as /projects?

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  • What is the `shadow` group used for?

    - by Shtééf
    On my Ubuntu 9.10 system, there's a shadow system group. There does not appear to be any user assigned to this group at all. The only files that I can find belonging to this group are /etc/shadow and /etc/gshadow. I'm aware that the purpose of these files is to store the passwords separately, out of reach from regular users who still might want to access passwd for other reasons. But what is the purpose of the shadow group? The reason I'm curious about this, is because I'm thinking about configuring nsswitch.conf to store it elsewhere, and would like to know if anything is actually trying to access the shadow database using shadow group credentials.

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  • Set LD_LIBRARY_PATH and CLASSPATH on cluster nodes before running a hadoop job

    - by Ashish Sharma
    I need to set LD_LIBRARY_PATH and CLASSPATH before running a job a cluster. In LD_LIBRARY_PATH i need to add location of some jars which are required while running the job, As these jars are avaiable at my cluster, similar with CLASSPATH. I have a 3 NODE cluster, I need to set this LD_LIBRARY_PATH and CLASSPATH for all the 3 data nodes so that the following jar are available while running the job

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  • Rearrange content of a file

    - by VikJES
    I'd like to rearrange the content of a file on a per line basis (see below), ideally without using Perl or Python (I'm not allowed to... Don't ask.) The input file contains unordered header lines and lines with backup operation results. The output files should contain the lines ordered as shown below. Original file: Completed Backups Backups with Warnings Failed Backups Server A backup was completed with warnings Server B backup was successful Server C backup failed Server D backup was completed with warnings End result: Completed Backups Server B backup was successful Backups with Warnings Server A backup was completed with warnings Server D backup was completed with warnings Failed Backups Server C backup failed

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  • why page is automatically redirecting to some other sites

    - by raj
    In my browser (Firefox 10.0.7) the page is automatically redirect to some other sites without clicking any link. If I enter the superuser.com url after pressing Enter button, It redirect to some other sites. sometimes while refreshing also the page is redirect to some other site. It's redirecting to this sites http://result.seenfind.com/ncp/Default.aspx?term=gatlinburg%20cabin&u=1000670913 http://search.cpvee.com/search.php?q=gatlinburg+cabin&y=&f=2168&s= http://www.insidecelebritygossip.com/ I cleared all history and all but still same problem. I am using CentOS 6.3

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