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  • Complex nagios command

    - by gonvaled
    I have defined the following command for one of my service checks: define command{ command_name mycommand command_line $USER1$/check_by_ssh -p $ARG1$ -l nagios -i /etc/nagios2/keys/key1 -H $HOSTADDRESS$ -v -C 'source $USER10$ ; command.py -a get --alert-name $ARG2$ -q' } The problem is that it seems that nagios is parsing the command with the semicolon, and producing garbage which can not be executed. I have tried also putting a backslash \;, to no avail. If I run the command directly on the shell, it works. Which means that this is not a problem with check_by_ssh, but a problem on the parsing of the nagios configuration file. How can I debug this? Is there a way to get a listing of all the commands that nagios has parsed when reading the configuration files?

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  • User and Key Press Issues with Putty

    - by DizzyDoo
    Ubuntu Server newbie here, got some annoying issues with remote accessing my box with Putty. When I create a user and then login as that user, the terminal always starts with just '#' and not 'user@hostname:~#' which isn't useful where I want to see where I've changed directory too, like I can normally. Also, when logged in as a user, I can't press the cursor keys to move the caret (blinking thing) around, or press up to see previously executed commands. Instead it gives me this representation of the button pressed: ^[[D ^[[A ^[[B ^[[C. Pressing Delete, too, gives me ^[[3~. This is all strange to me, because when logged in as root, it all works fine. I'm hoping this is just something I've accidentally changed in Putty, or added the user wrongly, or perhaps just got caps lock on. Thanks.

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  • How can I remap control+e to escape+control+e in iTerm2?

    - by cwd
    I have set up a few custom keyboard shortcuts in iTerm2 to easily move the cursor around with the arrow keys, but now I'd like to remap control+e to be escape, control+e because bash 4.2 no longer auto-expands variables using the tab key. I know I've done the first part correctly in choosing the keyboard shortcut to remap, but I don't understand how to look up the correct escape sequence (or hex codes) to send in the bottom section: I reference they keyboard codes but that wasn't much help. How can I remap this, and how can I look up the codes in the future? (No luck with Google) Update @db - thanks. To save others trouble I also found a cool util Key Codes.app which can be used to find key codes:

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  • Enable click-and-drag scrolling in Windows 8 / Metro?

    - by jdm
    In Windows 8 (Metro interface) I find myself trying to click and drag the background to scroll again and again, which does not work (I'm using a mouse, not touch). Also, scrolling with the scroll wheel, the bottom scrollbar, or the cursor keys is not nearly as smooth as I've seen in videos, or on tablets. Is there any way to enable smooth kinetic scrolling with the mouse? So that I can click and drag lists or multi-screen displays around? I remember seeing this in a video. I'm not sure if there was some third-party tool involved or not.

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  • Use .htaccess to block *All* access to specific folders.

    - by Urda
    I am not sure how to do this, but I want to block all access to a specific set of folders on my web server. Say secret01 and secret 02... homeDir |- data |- www | |- .htaccess (file) | |- images | |- js | |- secret01 | |- secret02 | |... |... What rule(s) do I need to add to my root .htaccess file to do this? I want all access from the web blocked from going into these folders, period. Only way one could get to them would be over SFTP or SSH. So what rule am I looking for? I am preferably looking for a one-liner so I can add more folders or move it to another site down the road. I really would prefer if the rule could be placed in the .htaccess root file so I don't have to jump all over the place to lock and unlock folders.

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  • Virtualbox VM (spawned by Vagrant) running but inaccessible. What now?

    - by Matt V.
    I have a Virtualbox VM running Ubuntu that was started by Vagrant. At some point my ssh session connected to the guest stopped responding. I tried "vagrant halt" from a terminal window on the host (OS X). The shutdown process seemed to also hang. Shutting down the Oracle VM VirtualBox Manager doesn't shut down the VMs themselves. Is there a way in either Vagrant or VirtualBox to force the running VM to shutdown? When running desktop guest OSes, closing the GUI window presents several options for shutting down the guest, but I don't know how to do the equivalent when the guest is running headless.

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  • Issues connecting to a pix 501 via console cable

    - by Bourne
    Have a pix 501 that was set up to do filtering and I was working on setting the vpn up when I lost ssh connectivity. Looking at the front, all 4 lan lights blink intensely green but in a very repetitive pattern. The funny thing is there are only 3 devices connected to the 4 ports so that's the first element that doesn't look right to me. Console cable light doesn't turn on when cable is plugged in and have tried rebooting it many many times to see the bootup sequence with no result. Also, I cannot connect to it via pdm or console but the traffic is permitted through. Are there any additional troubleshooting steps I could do or should I count it as dead? Thank you.

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  • How to map command in vim that maintains mode when invoked?

    - by Phoenix
    I'm configuring vim in Mac OS X's Terminal app to do useful things with my arrow keys (among others). For example, I want option-left to move the cursor back one word, similarly to how it works in other Mac applications. In normal mode, this is easy enough; I can simply map the sequence to b. But when I'm in insert mode, I want to stay in insert mode (i.e., map the sequence to <c-o>b. In my .vimrc` file, I have these lines: nmap ^[[xol~ b imap ^[[xol~ <c-o>b Where ^[[xol~ is the character sequence that I've configured Terminal to send when I press option-left. This works, but it gets pretty tedious, especially when I've got nearly two dozen commands that I want to map. Is there a better way to do this?

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  • Getting started with VNC

    - by Stephen
    I have subscribed to a VPS service for the purpose of running some remote applications. To do this I'm going to need a remote desktop of one sort or another. With this in mind it was suggested that I try Ubuntu. The installation that was prepared for me was Ubuntu 11.10 64 bit (Ubuntu 11.10 (GNU/Linux 2.6.18-348.4.1.el5.028stab107.1 x86_64)) From here I used apt-get install ubuntu-desktop which completed successfully. I rebooted the machine and reconnected via ssh. When I attempt to connect from TightVNC on my Windows machine I get a message about the session being actively refused. What should I do to confirm the service is running? Do I need to setup a firewall rule to allow the ports to pass through? (I am a linux newb so explicitness is appreciated)

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  • How can one make the title bar text/buttons have better contrast on dark colors in Windows 8?

    - by zeel
    When Windows 8 color setting are set to a very dark color, such as black or navy blue, the title bar text and the minimize/maximize buttons are nearly invisible. This makes dark colors difficult to work with. In Windows 7 there was an advanced color options, this is gone in 8. The registry keys associated with this seem to still be present, but they have no effect. Is there a way to change this? Or a third party application that can do it? I don't want to use the ugly high contrast theme, I want to use the nice Win 8 theme with a dark color.

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  • Lenovo G500 Re-booting failed

    - by Sune
    I have a Lenovo G500. Yesterday it asked me to reboot the system. I did. Now it wont come back on. I have tried everything I read online like taking out the battery and holding the power button in for 20 seconds, then switching on the pc with only the ac adapter plugged in. I still only see the backlight of the pc, nothing else. I also tried to hold in the Fn key and tried all other F keys (F2, F12, etc.) I also pressed that little button next to the power button, but nothing is responding. Please help.

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  • Windows port forwarding

    - by carlesso
    This is the scenario: A Windows XP client A Linux Server The client is natted/firewalled/unreacheable from outside, the linux server is public. I need to allow the client, once upon some conditions, to expose the remote desktop port (3389) on the Linux Server, somethig like ssh -R 3389:localhost:3389. I dream it as a service, or something like that so I can start and stop the "forwarding-session" on my needs. I've to pilot this session from some program-language (python or ruby mostly). Any hint? Thanks in advance.

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  • Can't unlock locked screen, in Ubuntu 12

    - by Camille Goudeseune
    After locking the screen (with a keystroke bound to xlock -nice 8 -mode blank), I can unlock the screen as expected, but only within a few minutes. After being locked overnight, when I hit a key (even Ctrl+Alt combos), the screen stays black with just a brief white flash across the middle of both monitors. The workaround is to ssh in from another host and restart X. Some months ago, this happened every few weeks. By now it happens almost every morning. How do I even start to diagnose this? What might I look for in log files? (The intermittency is particularly troubling.) Failing that, is there an alternative to xlock aka xlockmore? Hardware: 3-year-old HP minitower, GEForce 9800 GT, two Asus LCD monitors. Software: Ubuntu 12.04.2 LTS. Window manager awesome-wm. NVidia driver 304.88. XLock version xlockmore-5.31.

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  • Setting up linux server with multiple access rights

    - by Mark
    I am a graduate student and want to set up a linux server (preferably Ubuntu) in my office. I also want to give my friends SSH access to that box. My question is can I set up my server such that I can give one of my friends rights to install software on my machine but he cannot brows around outside the directory he is allowed to? Can I set up multiple apache instances (on different ports) for different people? so each has access to their own apache instance?

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  • xm console command is not working in XEN

    - by stillStudent
    I have XEN 4.0.x.x rpm with CENT OS. I have set it up and have many VMs on it. But problem is when I execute 'xm console ' command from dom0, command just hangs dom0 and some 'y' comes up in next line but nothing really happens. Is it a bug in xen 4.0 and I need to upgrade it or I can tweak some configuration file in /etc/xen/ to make it work. I found following at some site but its not working: In order to be able to login to your domU from the console using: xm create {your hostname}.cfg -c (to the set root password for ssh, for instance, or to see more output than just kernel output when debugging) it may be necessary to add the following line to your /etc/xen/{your hostname}.cfg extra='xencons=tty' Is there any other way to solve it?

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  • Do TCP connections work differently within the same subnet?

    - by Dean
    I've encountered some network behaviour that confuses me while trying to get Java RMI working. I use netcat to connect to a local machine: [my_machine]$ nc -w 1 192.168.0.100 60000 && echo success success I try to do the same to my server: [my_machine]$ nc -w 1 my-servers-ip 60000 && echo success This doesn't work, unless I explicitly listen on the server socket: [amazon_ec2]$ nc -l 60000 [my_machine]$ nc -w 1 my-servers-ip 60000 && echo success success For the version that fails, the SYN packet receives a RST, ACK in response. I'm not too knowledgable about this stuff, at this point I only have wild theories such as the one in the question. Any ideas? Potentially useful details: Local Machine (192.168.0.100) - Macbook Remote Machine (Amazon EC2) - Amazon Linux AMI 2012.03 Security Group Settings: 22 (SSH) 0.0.0.0/0 1099 0.0.0.0/0 49152-65535 0.0.0.0/0 "iptables -L" shows no rules set

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  • SSL issues with puppet agent at openSUSE

    - by Roman Grazhdan
    I have a master running at my vps, and it has a simple helloworld manifest which works fine with any ubuntu machine I have. It connects, exchanges keys and creates test file allright, so I'm sure it's not server issue. The agent which is running at a virtual machine with openSUSE says: err: Could not request certificate: SSL_connect returned=1 errno=0 state=SSLv3 read server certificate B: certificate verify failed. This is often because the time is out of sync on the server or client I believe it's probably a broken or missing lib, since the package is not built very accurately - it wouldn't start out of the box because of wrong path to lockfile, for example. So how do I figure out what exactly is wrong here? The time is allright, I've checked it. I probably could do without SSL if it's possible, since that SUSE machines are just for training, but it's the last opportunity.

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  • Ping IP: connect: no such process

    - by Matthew
    I am trying to figure out this issue and am getting a weird error. We have two boxes which used to talk to one another on the network. Both are reachable via ssh from a separate network, which means they are able to talk to their default gateways just fine. When we try to ping from the linux machine to the linux machine, we get a bunch of timeouts. When we try to ping from the linux box back, we are getting connect: no such process. I can't seem to find much documentation on this error, though there consistently seem to be references to VPN stuff when googling for this error. The

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  • How to move mail accounts when migrating webhosting

    - by pkswatch
    I am migrating my website abc.com from one webhosting company to another in a shared hosting environment. Both have cpanel. And the second hosting account i am preparing to move is my multi-domain hosting account with 3 domains already in it. The problem is, i have many email accounts associated with my website abc.com, which are accessed using webmail. So if i move it to the other host, will i lose all those accounts and their emails? If yes, then how should i synchronise the email accounts so that all the accounts and the contained emails remain intact? I saw some several sync tools like IMAP Sync, etc. But these require two hosts while synchronizing, and as you see, i have just one domain name to be synchronized over 2 servers. PS, i do not have any ssh access on either of them, and i have made complete backup of all files using backup wizard in cpanel.

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  • Best practice for administering a (hadoop) cluster

    - by Alex
    Dear all, I've recently been playing with Hadoop. I have a six node cluster up and running - with HDFS, and having run a number of MapRed jobs. So far, so good. However I'm now looking to do this more systematically and with a larger number of nodes. Our base system is Ubuntu and the current setup has been administered using apt (to install the correct java runtime) and ssh/scp (to propagate out the various conf files). This is clearly not scalable over time. Does anyone have any experience of good systems for administering (possibly slightly heterogenous: different disk sizes, different numbers of cpus on each node) hadoop clusters automagically? I would consider diskless boot - but imagine that with a large cluster, getting the cluster up and running might be bottle-necked on the machine serving the OS. Or some form of distributed debian apt to keep the machines native environment synchronised? And how do people successfully manage the conf files over a number of (potentially heterogenous) machines? Thanks very much in advance, Alex

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  • Linux freezes every few seconds

    - by Zeppomedio
    We're having an issue where one our Linux boxes (Ubuntu 10.04 LTS, running on EC2 with a quadruple-large size, 68GB of RAM and 8 virtual cores with 3.25GHz each) freezes up every few seconds. Typing in an ssh session will freeze, and running strace on one of the Postgresql processes that's running usually shows: 02:37:41.567990 semop(7831581, {{3, -1, 0}}, 1 for a few seconds before it proceeds (it always gets stuck at that semop). OProfile shows that most of the time is spent in the kernel (60%) versus 37% in Postgresql. The result of these halts (which began suddenly a day ago) is that load on the box has gone from 0.7 to 10+, and causes our entire stack to slow done. Any ideas on how to track down what's going on? iostat doesn't show the disks being particularly slow or overloaded, and top shows user cpu % spike from 8% to about 40% whenever these back-ups happen.

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  • Cisco: changing VTP mode server/client to transparent

    - by J. Smith
    I have around 40 L2 switches (2960, 3560, 3500, 3750) running in VTP client mode and one L3 switch (6500) running in VTP server mode, all connected together. I would like to switch everything in VTP transparent mode without any interruption of service. I've already test on a poc version with 3 switches (Catalyst 2950, 3560 and 3750). Using serial and SSH connection, it is seems working but i'm not sure it is enough representative compare to the real network. Knowing that the VTP Pruning is enabled, I am wondering what would be the best procedure to proceed the changement. I've read that we could lost connection by keeping it enabled. Should I change the server or clients first? Is it important to change the VTP domain and VTP Pruning parameters?

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  • Locale setting on a Red Hat box

    - by sasuke
    Hi all, Recently our organization got a couple of server boxes which are I guess present in some data-center in UK. The problem is that for some reason the default Locale representation in Java on that server returns en_US instead of the expected en_GB (I confirmed this by running a code on that server which simply outputs Locale.default()). I am pretty sure this has got something to do the way in which the boxes were set up. My question is: what would be the approach to fix this issue now that the OS has been installed? Is there any way I can for a given SSH session set the locale as en_GB instead of the current en_US? TIA, sasuke

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  • How to make a secure MongoDB server?

    - by Earlz
    Hello, I'm wanting my website to use MongoDB as it's datastore. I've used MongoDB in my development environment with no worries, but I'm worried about security with a public server. My server is a VPS running Arch Linux. The web application will also be running on it, so it only needs to accept connections from localhost. And no other users(by ssh or otherwise) will have direct access to my server. What should I do to secure my instance of MongoDB?

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  • Running php and java in parallel on the same server

    - by manni
    I have got a java server from Rackspace. and I am already running a java application on the server. Now I want to run a php application on the same server. What should I do? When I asked Rackspace people, they said, apache is already installed on the server so I can run the php on it. I have also tried installing php on the server and then copied my php files in var/www/xxx but when I hit the url it is saying giving the page not found error. They have given me the ssh server root username and password. Thanks in advance.

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