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• iMac goes black, makes clicking sound... thoughts?

  - by Josh

  This is the second time this has happened. The display on my Apple iMac (20-inch Late 2006) just went black, system was completely unresponsive to mouse/keyboard input, I could not SSH into nor ping the machine, and it didn't show up in ARD. I could hear a fairly loud clicking noise from inside which sounded like the DVD drive trying to seek -- but there is no disc in the drive. It could possibly be the hard drive... I pressed the power button and the system powered off, and now will not power on again. Thoughts / suggestions as to next course of action?

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• Input devices stopped working during system upgrade

  - by amorfis

  Hi, I was upgrading Ubuntu on my server (but Ubuntu is in desktop version) when mouse and keyboard stopped working :( So the screen went black (screensaver), and now I can't do anything. I don't know what stage of upgrade it stopped working, probably now it waits for me to answer some question. Keyboard and mouse were connected by KVM, connecting them directly doesn't help. Both are on USB. What I can do, is connecting to the machine by ssh. Can I somehow see and answer questions of update system and somehow finalize process of upgrade?

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• How can I secure Postgres for remote access when not in a private network?

  - by orokusaki

  I have a database server on a VMWare VM (Ubuntu 12.04.1 LTS server), and it just occurred to me that the server is accessible via the web, since the same physical server contains a VM that hosts public websites. My iptables in the database are such that only SSH traffic, loopback traffic, and TCP on port 5432 are allowed. I will only allow host access to the Postgres server from the IP of the other VM on the same physical machine. Does this seem sufficient for security, assuming there aren't gaping holes in my general OS configuration, or is Postgres one of those services that should never be web facing, (assuming there are some of "those"). Will I need to use hostssl instead of host in my pg_hba.conf, even though the data will travel only on my own network, presumably?

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• PHPUnit and autoloaders: Determining whether code is running in test-scope?

  - by pinkgothic

  Premise I know that writing code to act differently when a test is run is hilariously bad practise, but I may've actually come across a scenario in which it may be necessary. Specifically, I'm trying to test a very specific wrapper for HTML Purifier in the Zend framework - a View Helper, to be exact. The HTML Purifier autoloader is necessary because it uses a different logic to the autoloaders we otherwise have. Problem require()-ing the autoloader at the top of my View Helper class, gives me the following in test-scope: HTML Purifier autoloader registrar is not compatible with non-static object methods due to PHP Bug #44144; Please do not use HTMLPurifier.autoload.php (or any file that includes this file); instead, place the code: spl_autoload_register(array('HTMLPurifier_Bootstrap', 'autoload')) after your own autoloaders. Replacing the require() with spl_autoload_register(array('HTMLPurifier_Bootstrap', 'autoload')) as advertised means the test runs fine, but the View Helper dies a terrible death claiming: Zend_Log[3707]: ErrorController caught LogicException "Passed array does not specify an existing static method (class 'HTMLPurifier_Bootstrap' not found)" (Our test folder structure is slightly different to our Zend folder structure by necessity.) Question(s) After tinkering with it, I'm thinking I'll need to pick an autoloader-loading depending on whether things are in the test scope or not. Do I have another option to include HTMLPurifier's autoloading routine in both cases that I'm not seeing due to tunnel vision? If not, do I have to find a means to differentiate between test-environment and production-environment this with my own code (e.g. APPLICATION_ENV) - or does PHPUnit support this godawful hackery of mine natively by setting a constant that I could check whether its been defined(), or similar shenanigans? (My Google-fu here is weak! I'm probably just doing it wrong.)

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• Using Vim on the ipad... Any tips?

  - by pax1728

  I'm itching to program on my ipad. With the iSSH app I was able to log on to my university's server and even open an X server window. Unfortunately, the experience within iSSH is still rather clumsy. When using vim, the bottom line is hidden by the keyboard. Does anyone have any experience with SSH connections and the ipad or iphone? Are there better applications to use? I would prefer not to jailbreak my ipad.

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• FreeNX 0.7.3 under CentOS 6.3 - Negotiating link parameters

  - by Frank

  since some days I try to get freenx (CentOS package 0.7.3) running under CentOS 6.3. It is like found on many websites: First login is successfull, after that all login attempts fail with the negotiation error. A simple ssh with the same username to the server is successful. For the installation I followed the howTo on http://wiki.centos.org/HowTos/FreeNX Strange is that the changelog of FreeNX 0.7.3 tells that this bug was fixed. Has anybody been successful in running FreeNX under CentOS without this problem and knows how to fix it? Frank

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• Running game server and webserver on EC2

  - by mazzzzz

  Hey guys, I have a webhost, and an EC2 server (to run a game server on). The problem is that I want to access/modify the EC2's files with php admin programs. I looked into a lot of options to just have the webhost communicate with the EC2 server (ssh, etc), but none of them panned out. My question is if I were to install a lightweight webserver (think lighttpd) on my EC2 server, how badly would it hurt the game server's performance? I was leaning away from this solution, even though the webserver (on the EC2 server) wouldn't get many hits (less than a 100 a day). Thanks for your thoughts, Max

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• Ubuntu server very slow out of the blue sky (Rails, passenger, nginx)

  - by snitko

  I run Ubuntu server 8.04 on Linode with multiple Rails apps under Passenger + nginx. Today I've noticed it takes quite a lot of time to load a page (5-10 secs). And it's not only websites, ssh seems to be affected too. Having no clue why this may be happening, I started to check different things. I checked how the log files are rotated, I checked if there's enough free disk space and memory. I also checked IO rate, here's the output: $ iostat avg-cpu: %user %nice %system %iowait %steal %idle 0.17 0.00 0.02 0.57 0.16 99.07 Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn xvda 2.25 39.50 16.08 147042 59856 xvdb 0.00 0.05 0.00 192 0 xvdc 2.20 25.93 24.93 96530 92808 xvdd 0.01 0.12 0.00 434 16 xvde 0.04 0.23 0.35 858 1304 xvdf 0.37 0.31 4.12 1162 15352 Rebooting didn't help either. Any ideas where should I be looking?

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• Trouble editing ~/.bash_profile: -bash: $'\r': command not found

  - by Dave

  I installed CygWin on Windows 7. Using Notepad, I edited my ~/.bash_profile file to add on to the PATH variable … PATH="${PATH}:/cygdrive/c/apache-ant-1.8.2/bin" Now, when I SSH in to my Windows machine, I get this error … -bash: $'\r': command not found -bash: $'\r': command not found -bash: $'\r': command not found -bash: $'\r': command not found -bash: $'\r': command not found -bash: /home/dev/.bash_profile: line 39: syntax error: unexpected end of file and my PATH is not set. Anyone know how I can correct this?

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• Can I recover a nano process from a previous terminal?

  - by davidparks21

  My system crashed while I was in a nano session with unsaved changes. When I log back in via SSH I see the nano process still running when I do a ps. davidparks21@devdb1:/opt/frugg_batch$ ps -ef | grep nano 1001 31714 29481 0 18:32 pts/0 00:00:00 nano frugg_batch_processing 1001 31905 31759 0 19:16 pts/1 00:00:00 grep --color=auto nano davidparks21@devdb1:/opt/frugg_batch$ Is there a way I can bring the nano process back under my control in the new terminal? Or any way to force it to save remotely (from my new terminal)?

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• CentOS PAM+LDAP login and host attribute

  - by pianisteg

  My system is CentOS 6.3, openldap is configured well, PAM authorization works fine. But after turning pam_check_host_attr to yes, all LDAP-auths fail with message "Access denied for this host". hostname on the server returns correct value, the same value is listed in user's profile. "pam_check_host_attr no" works fine and allows everyone with correct uid/password a piece of /var/log/secure: Sep 26 05:33:01 ldap sshd[1588]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=my-host user=my-username Sep 26 05:33:01 ldap sshd[1588]: Failed password for my-username from 77.AA.BB.CC port 58528 ssh2 Sep 26 05:33:01 ldap sshd[1589]: fatal: Access denied for user my-username by PAM account configuration Another two servers (CentOS 5.7 Debian) authorizes on this LDAP server correctly. Even with pam_check_host_attr yes! I didn't edit /etc/security/access.conf, it is empty, only default comments. I don't know what to do! How to fix this?

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• Hostname problems in CentOS 5.5

  - by spoon16

  I just set up a CentOS 5.5 machine on my local network and attempted to modify the hostname by editing /etc/sysconfig/network file. When I'm logged in locally the change to the hostname is reflected and seems to be working fine. When I open a SSH session via PuTTY from Windows this is what I see at the prompt: [root@? ~]# cat /etc/sysconfig/network NETWORKING=yes NETWORKING_IPV6=yes HOSTNAME=mini.local [root@? ~]# sysctl kernel.hostname kernel.hostname = ? [root@? ~]# hostname ? [root@? ~]# hostname -f hostname: Unknown server error A couple of other symptoms that may be helpful in troubleshooting this problem. I can ping the CentOS box from my Windows machine via IP but not hostname. Also, my Netgear router does not display the hostname when I view the "Connected Devices", I do see the mac address and the proper IP listed though. How can I make it so that the hostname is properly propagated throughout my network?

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• firehol (firewall) with bridge: how to filter

  - by Leon

  I have two interfaces: eth0 (public address) and lxcbr0 with 10.0.3.1. I have a LXC guest running with ip 10.0.3.10 This is my firehol config: version 5 trusted_ips=`/usr/local/bin/strip_comments /etc/firehol/trusted_ips` trusted_servers=`/usr/local/bin/strip_comments /etc/firehol/trusted_servers` blacklist full `/usr/local/bin/strip_comments /etc/firehol/blacklist` interface lxcbr0 virtual policy return server "dhcp dns" accept router virtual2internet inface lxcbr0 outface eth0 masquerade route all accept interface any world protection strong #Outgoing these protocols are allowed to everywhere client "smtp pop3 dns ntp mysql icmp" accept #These (incoming) services are available to everyone server "http https smtp ftp imap imaps pop3 pop3s passiveftp" accept #Outgoing, these protocols are only allowed to known servers client "http https webcache ftp ssh pyzor razor" accept dst "${trusted_servers}" On my host I can connect only to "trusted servers" on port 80. In my guest I can connect to port 80 on every host. I assumed that firehol would block that. Is there something I can add/change so that my guest(s) inherit the rules of the eth0 interface?

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• Passing all traffic through Cloudflare

  - by Nick

  I am new to Linux System Administration and I am experimenting with iptables trying to learn how to really lock down a system with them. And one thing a friend of mine recommended was that there was a way to pass all incoming traffic through Cloudflare so even if attackers resolved the server ip they still couldn't (D)dos it directly. This is exactly what they said: "Simply config your servers iptables to only allow incoming connections from CloudFlares IP ranges then set it to allow only your IP/IP range to connect on port 21 (SSH)" Could someone help me on what command I'd need to run for Ubuntu to get this effect?

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• %HOMEPATH% Posh-Git error in Powershell, in ConEmu on Windows 7 64-bit

  - by atwright

  I am always getting the following error in Posh-Git in Powershell, in ConEmu on Windows 7 64-bit: Resolve-Path : Cannot find path 'C:\wamp\www\MobileApps\Backbone\%HOMEPATH%' because it does not exist. At D:\Users\Andy\Documents\WindowsPowerShell\Modules\posh-git\GitUtils.ps1:265 char:13 + $home = Resolve-Path (Invoke-NullCoalescing $Env:HOME ~) + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : ObjectNotFound: (C:\wamp\www\Mob...bone\%HOMEPATH%:String) [Resolve-Path], ItemNotFoundException + FullyQualifiedErrorId : PathNotFound,Microsoft.PowerShell.Commands.ResolvePathComma nd Join-Path : Cannot bind argument to parameter 'Path' because it is null. At D:\Users\Andy\Documents\WindowsPowerShell\Modules\posh-git\GitUtils.ps1:266 char:29 + Resolve-Path (Join-Path $home ".ssh\$File") -ErrorAction SilentlyContinue 2> ... + ~~~~~ + CategoryInfo : InvalidData: (:) [Join-Path], ParameterBindingValidationExc eption + FullyQualifiedErrorId : ParameterArgumentValidationErrorNullNotAllowed,Microsoft.Po werShell.Commands.JoinPathCommand Can anybody advise what might be wrong?

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• How do I Connect a 30yr-old Tandy 1400LT laptop to the internet?

  - by Clemens Bergmann

  Just for the fun of it, I want to get an old Tandy 1400LT laptop: small monochrome display two floppy drives rs-232c connector "printer" connector connect the thing the internet and use it as an ssh terminal. How would I connect it to the internet? The software should be no problem as it is a 386 hardware. There should be a small linux distribution which can be run on it. But how would I phisically connect the hardware? It has no ethernet port. Has someone experience with Serial/Paralel-to-ethernet converters?

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• How to transfer files between a remote Linux machine and a local Windows machine?

  - by Lazer

  I need to transfer files/folders between a remote machine running Linux and my local machine running Windows XP. I usually access the remote machine through ssh, and sometimes use VNC sessions. What is the easiest way to transfer a file from the remote machine to my local machine and vice versa? I think ftp should be the solution. Is there a better way? If ftp is a good option, how do I initiate the transfer? Do I need to setup ftp servers on both the machines and then transfer? What exactly needs to be done?

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• bash script - spawn, send, interact - commands not found error

  - by Sandeepan Nath

  I my shell script, I am trying to remove password prompt for scp command (as given in http://stackoverflow.com/questions/459182/using-expect-to-pass-a-password-to-ssh/459225#459225) and this is what I have so far :- #!/usr/bin/expect spawn scp $DESTINATION_PATH/exam.tar $SSH_CREDENTIALS':/'$PROJECT_INSTALLATION_PATH expect "password:" send $sshPassword"\n"; interact On running the script, I am getting errors spawn: command not found send: command not found interact: command not found I was also getting error expect: command not found also, then I realised the path to expect was not correct and expect was not installed at all. So, I did yum install expect, corrected the path and the error was gone. But not able to remove the other 3 errors still.

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• kinit gives me a Kerberos ticket, but no AFS token

  - by Tomas Lycken

  I'm trying to setup access to my university's IT environment from my laptop running Ubuntu 12.04, by (mostly) following the IT-department's guides on AFS and Kerberos. I can get AFS working well enough so that I can navigate to my home folder (located in the nada.kth.se cell of AFS), and I can get Kerberos working well enough to forward tickets and authenticate me when I connect with ssh. However, I don't seem to get any AFS tokens locally, on my machine, so I can't just go to /afs/nada.kth.se/.../folder/file.txt on my machine and edit it. I can't even stand in /afs/nada.kth.se/.../folder and run ls without getting Permission denied errors. Why doesn't kinit -f [email protected] give me an AFS token? What do I need to do to get one?

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• How do I use a virtualbox guest machine as a gateway?

  - by Igor Zinov'yev

  I have a certain problem. I am working on an Ubuntu machine, but I have to use a windows 2003 server guest to connect to a Stonegate VPN to be able to manage our client's website. I have already asked if I could connect to a Stonegate VPN in Ubuntu, but so far got no answer. And I couldn't connect to it using network manager's strongswan plugin. So I want to use my guest Win2003 as a gateway to be able to SSH to the remote server. Is that possible? Thank you very much in advance, if this is possible in any way, it will save me a lot of trouble!

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• using Linux vncviewer

  - by Darkoni

  Hi ! when i am connecting to VNC server using wine on linux $ wine vncviewer.exe i have to enter: VNC Server: 1.1.1.21 Proxy/Reapeter: 195.29.18.33:1234 and then, when i connect, on top there is txt: 1.1.1.21:5900 (195.29.18.33:1234) mine question is: how to connect using vncviewer ? what to put in VNC_VIA_CMD ? $ export xlocalPort=1234 $ export xremoteHost=1.1.1.21 $ export xremotePort=5900 $ export xgateway=195.29.18.33 $ export VNC_VIA_CMD="/usr/bin/ssh -f -L $xlocalPort:$xremoteHost:$xremotePort $xgateway sleep 20" $ vncviewer $xremoteHost -via $xgateway and i get error: unable connect to socket: Connection refused (111) i was trying to help myself with page http://www.tightvnc.com/vncviewer.1.php Please help, couse i need to use "native" linux vncviewer installed by $ yum install tigervnc tigervnc.i686 0:1.0.90-0.13.20100420svn4030.fc13 Thnx

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• Ghosting context menu clicks in WinXP

  - by Swish

  Let me preface by saying I have a lot of windows open most of the time, although not resource intensive ones, just browsers, ssh sessions, a music player, FTP client, Notepad++, IM clkients, etc. Anyway, I get a lot of weird visual "ghosting" type effects. For example when right-clicking and then selecting an option from a context menu the selected item will remain in view until I right click somewhere on the desktop. Same thing happens when selecting items from the File, Edit, etc. menu in various programs. I'm assuming this is just a result of a less than high quality video card (NVIDIA GeForce FX 5200), all the other hardware in the machine is newer higher quality, that specific video card was added after the fact for multiple monitors. I have looked all over the web for solutions and have increased the number of GDI handles for Windows, reduced the hardware accelaration on the card, etc. Any suggestions other than replace the card?

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• Why are there tons of PHP processes open on my server?

  - by fiftyeight

  Today I saw that a website of mine isn't working so I ssh'd to the server and executed ps -eF. I see about 200 PHP processes that are running all for 4 hours. Apache is built with mpm event and mod fcgid. I killed all the PHP processes and now it's running fine, why does this happen? is this expected behavior? I don't really understand how processes how Apache keeps track of the number of PHP processes and their process IDs, so it would be nice if someone can also give some reference when I can read about this. Also, I used the "ab" command (Apache Benchmark) to see if this happens all the time, so I ran it about 4-5 times with 30 concurrent requests and again there are like 150 PHP processes running, when I keep running "ab" now it doesn't spawn more processes and the website is still working. Please shed some light on this! Thank you :)

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• Steps to take when technical staff leave

  - by Tom O'Connor

  How do you handle the departure process when privileged or technical staff resign / get fired? Do you have a checklist of things to do to ensure the continuing operation / security of the company's infrastructure? I'm trying to come up with a nice canonical list of things that my colleagues should do when I leave (I resigned a week ago, so I've got a month to tidy up and GTFO). So far I've got: Escort them off the premises Delete their email Inbox (set all mail to forward to a catch-all) Delete their SSH keys on server(s) Delete their mysql user account(s) ... So, what's next. What have I forgotten to mention, or might be similarly useful? (endnote: Why is this off-topic? I'm a systems administrator, and this concerns continuing business security, this is definitely on-topic.)

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• How to secure Firefox traffic (+DNS) through SOCKS proxy under Ubuntu 10.04?

  - by Maarx

  I'm using Ubuntu 10.04, and starting a SOCKS proxy with 'ssh -D', and setting Ubuntu to use it with "System - Preferences - Network Proxy". Firefox uses the proxy, and the proxy's IP appears when I visit a site like http://www.whatismyip.com/. My question is, is Firefox resolving DNS requests through this proxy? Is my web-browsing truly secure? (That is, until I exit the other end of the proxy. I know it's insecure after that.) (And I've verified the keys, I'm not being man-in-the-middled) (And--screw it. You know what I mean. Is it resolving DNS requests through the proxy?) I don't know how I would go about verifying such a thing for myself. Using additional hardware such as another debugging proxy is not an option. If Firefox isn't resolving my DNS requests through the SOCKS proxy, how do I go about fixing it?

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