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• How can I shut down all my Virtual Machines when my UPS kicks in?

  - by Tim

  I have a Dell T610 running ESXi4, an APC Smart UPS 1000VA and a local "console" machine running Vista and the vSphere 4 Essentials pack. A dedicated management network is in place between the T610 and the Vista machine. We have 4 VMs: SBS 2003, Server 2003 running Terminal Services, and two XP Machines. Ideally, when the UPS is forced to use battery power [for a set number minutes], I would like to gracefully shutdown all the VMs, then the ESXi, then the console machine. The latter two are not strictly a priority, but the VMs within ESXi are. Google provided lots of deprecated scripts that used to work on ESXi 3.x or similar, however I am unable to find what they were deprecated by. What do I need to be able to do this? I have Powerchute Express as supplied with the UPS, but would be willing to pay for software if required.

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• DDoS attacks to PBX

  - by user316687

  I'm wondering if DDOS attacks to PBX or telecommunications systems is possibe real. According to this links: http://threatpost.com/en_us/blogs/firm-sees-more-ddos-attacks-aimed-telecom-systems-073112 http://news.softpedia.com/news/DDOS-Attacks-Against-Telecom-Systems-Cost-as-Little-as-20-16-Per-Day-284875.shtml it is possible. There are DDOs attacks to web servers, which mostly give them so much concurrent loads or connections that service get unavailable. Many government or non-profit organizations that suffered this kind of attacks, eventually could choose to shutdown their web server and that's it, waiting for these attacks to end. For a DDOs attacks to PBX, I imagine that it would result in telephones getting busy or ringing all the time unstoppably. This kind of attack could really damage any kind organization. Is it possible to do that or are we just in the beginnings?

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• How to integrate monit into web app deployment process

  - by shabunc

  I have: Tomcat with webapp deployed via mvn tomcat:redeploy. Monit, pinging the host and restarting server if ping failed. The thing is there in a moment during the redeployment when ping will fail - and this is normal, actually. So, the question is - what is the best way to teach monit to consider the fact of redeployment and not to confuse it with "real" black outs. This is of course an issue of balance between elegance, ease of implementation and scalability. The most straightforward solution I can think of - is just to shutdown monit before deployment and start it up after once again. But this if far from elegance I guess.

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• laptop suddenly became very slow

  - by Ieyasu Sawada

  I have a compaq laptop. And I've been using it 2 years now. Then this day, it suddenly became very slow. It almost took 5 minutes from turning on to the log on screen. I click my username and it took 3 minutes to show the desktop. I click on my computer then properties to see if it is still showing 2 Ghz for the Core 2 duo processor. And 2gb for the memory. It took 10 minutes for all the information to show up. And its still 2gb and 2Ghz. So I may conclude that this is not a problem in memory or cpu. Its still running perfectly last night. And I have not seen signs of it failing. Things I already tried: Rebooting Shutdown then turn on again So how do I determine what causes this problem? How do I fix it?

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• Grandma's Computer - Can a user that belongs only to the "Users" group in Windows XP install malware, virus or IE addons?

  - by DanC

  I am trying to figure out if having a user in the "Users" group will be enough to prevent her from install unwanted software. The things that I don't want the user to be able to install are: virus malware bandoo stuff Internet Explorer Addons To put you in context, I am thinking of my grandma's computer, I want her to be able to read all her email stuff and attachments, but without the hassle of needing to reinstall the whole computer every few months. The computer will run Windows XP, with some free antivirus. It will not be part of any domain. It is just a home computer. Linux, I have tried making her use it, but she was already accustomed to Windows and was not really an option to have her re-learn where was the shutdown button. So, are these considerations enough to prevent her installing unwanted software? What other options come to you mind? Thanks

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• Is a reboot required to refresh permissions after adding a user to a new group?

  - by Michael Prescott

  On ubuntu server, I've noticed more than once now that after adding a user to a group that user doesn't have group permissions until I reboot the system. For example: User 'hudson' needs permission to read directory 'root:shadow /etc/shadow' So I add hudson to the shadow group. hudson still cannot read. So, I 'sudo shutdown -h -r now' and when the system comes up again user hudson can read. Is a reboot required or is there a better way to get permissions applied after adding the user to the group?

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• Does Wake-on-LAN from power state S5 require any OS configuration?

  - by TARehman

  I am configuring a HTPC which I would like to be able to power on using Wake-on-LAN, from the S5 state (full shutdown, still plugged in). The system is running Linux Mint 14 Cinnamon. I'm getting some conflicting information in my searching on the Net. I am not concerned with using WoL to change the state from standby or hibernate to on. Because of the current interface to our TV, the system must be either turned on or turned off. So, basically, this system will cycle from S0 to S5, and from S5 back to S0, and so on. Some tutorials suggest that I need to use ethtool to configure things after enabling WoL in my BIOS, but my understanding is that doing an S5 - S0 power on only requires the BIOS to be configured (since when the computer is in state S5, the OS hasn't even been loaded anyway). Can I use WoL with only the BIOS configured to go from state S5 to S0, or will I need to configure the OS as well?

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• Unknown/unsupported storage engine: InnoDB | Mysql Ubuntu

  - by Kayle

  I recently upgraded from the previous LTS Ubuntu to Precise and now mysql refuses to start. It complains of the following when I attempt to start it: ?$ sudo service mysql restart stop: Unknown instance: start: Job failed to start And this shows in "/var/log/mysql/error.log": 120415 23:01:09 [Note] Plugin 'InnoDB' is disabled. 120415 23:01:09 [Note] Plugin 'FEDERATED' is disabled. 120415 23:01:09 [ERROR] Unknown/unsupported storage engine: InnoDB 120415 23:01:09 [ERROR] Aborting 120415 23:01:09 [Note] /usr/sbin/mysqld: Shutdown complete I've checked permissions on all the mysql directories to make sure it had ownership and I also renamed the previou ib_logs so that it could remake them. I'm just getting no where with this issue right now, after looking at google results for 2 hours.

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• How to backup a full Centos Server?

  - by benjisail

  Hi, I switched a few weeks ago from a dedicated server to a VPS. Now that everything is working well on the VPS I would like to shutdown the dedicated server and close my account with the hosting company. For peace of mind and in order to be more safe I would like to do a full backup of the server before stopping it. The best would be a backup that I could browse if I find that I need a something in the backup. What would be the best solution from command line? Thanks!!!

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• Apache https configurations

  - by sissonb

  I am trying to setup my domain name with a self signed cert. I created the cert and placed the server.key and server.crt files into C:/apache/config/ Then I updated my httpd.confg host to include the following, <VirtualHost 192.168.5.250:443> DocumentRoot C:/www ServerName mydomain.com:443 ServerAlias www.mydomain.com:443 SSLEngine on SSLCertificateFile C:/apache/conf/server.crt SSLCertificateKeyFile C:/apache/conf/server.key SSLVerifyClient none SSLProxyEngine off SetEnvIf User-Agent ".*MSIE.*" \ nokeepalive ssl-unclean-shutdown \ downgrade-1.0 force-response-1.0 CustomLog logs/ssl_request_log \ "%t %h %{SSL_PROTOCOL}x %{SSL_CIPHER}x \"%r\" %b" </VirtualHost> Now when I go to https://mydomain.com I get the following error. SSL connection error Unable to make a secure connection to the server. This may be a problem with the server, or it may be requiring a client authentication certificate that you don't have. Error 107 (net::ERR_SSL_PROTOCOL_ERROR): SSL protocol error. Can anyone see what I'm doing wrong? Thanks!

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• Strange Exchange 2010 Mailbox issues

  - by jmreicha

  A little bit of information on my environment. I have 2 Exchange 2010 mailbox servers setup in a DAG, connected to a VNX SAN via fiber for the mailbox database disks. One of the servers seems to be working fine as it isn't throwing any similar errors but the other has been receiving strange errors in Event Viewer. I haven't been able to find a pattern to when these happen and I'm not really sure what I should be looking at to troubleshoot this. At this point I am wondering if the issue resides on the SAN or if this is because of an improper shutdown or something else on the Exchange side of things? Here are a few of the errors if that helps:

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• There is a commercial tool like Xen + Remus?

  - by SoMoS

  Hello, I have a project where we need a completely redundant system like the one offered by Remus with a Xen virtualization system. I wondered if there is a system like this one built by VMWare or some other company because the project is a very critical one and we do not want to have to wait that a bug is fixed by "the community" and money is not a problem. What Remus does is to build a completely redundant system where you can shutdown one machine and the other continues the work where the other left it maintaining the network connections opened, etc Any hint? Thanks in advance.

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• Windows Server 2003 guest on Xen frequently stops responding

  - by smokris

  I'm running a Windows Server 2003 guest instance in Xen 3.x. This DomU runs fine for a day or two, then stops responding — I don't get any network response, and I can no longer connect to Xen's VNC console for this DomU. xm list shows this: Name ID Mem VCPUs State Time(s) Domain-0 0 6508 8 r----- 1161159.4 [A working Linux DomU] 1 512 1 -b---- 68711.1 [The hung Windows DomU] 5 512 1 ------ 67234.2 [Another working Linux DomU] 3 512 1 -b---- 163036.4 (What does the ------ mean? The xm manual explains what each of the six states mean, but not what no-state means.) If I xm destroy and then xm create the Windows DomU again, it boots right back up (with the Windows alert The previous system shutdown at [...] was unexpected.), and then stops responding after another day or two. I checked /var/log/xen/*.log, but no log messages are generated at the time the server stops responding. How should I proceed in troubleshooting this?

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• Difference in behavior of reboot

  - by LinuxPenseur

  Hi, I have 2 machines running linux. In one machine, the reboot command is an executable normally found in all linux distributions. In the second machine the reboot command is a shell script customized using some other hardware tool commands to reboot the system. One behavior difference between the 2 machines is that when i execute reboot command on the first machine, it shows another shell prompt and then only reboots. But in the case of second machine, it reboots without showing a shell prompt. I expect the second machine to behave the same way as first machine when reboot command is given. Currently i am analyzing the source code of shutdown.c and halt.c normally found in linux distributions, so that i can find out the implementation which produces the shell propmt on reboot and use that in the shell script in second machine. Kindly give me some pointers on where i should start looking to find the implementation. Thanks

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• Why would the servers network type change from Private to Public?

  - by Phil Hannent

  Just found a fault with a server, other users have had problems connecting to it. The setting on the network card had changed from Private (domain) network to Public (the other option being Home). The switch to the network interface would have caused the firewall to block a lot of normal functions. I am guessing that since the event log showed no reason for the change that it might be due to a complete shutdown we had recently where someone powered up the machines, however the domain controllers might not have been booted up first. Any confirmation that this might be the case?

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• Way to wake up win-xp pc, without hibernate or network?

  - by crosenblum

  I have no need to wake up a remote pc, just the pc I use at work. I want to wake it up, by itself, without having to use hibernate, which I am not comfortable with, or have ever used. Then I can have the "System Scheduler" freeware that I use, to automatically do anti-virus updates, anti-malware updates, ccleaner /auto of course... It just would make my day's easier if it was already on by the time I arrived, I usually always turn my pc off when I am done with work, or if I didn't, I have a scheduled task to auto-shutdown pc 1 hour after my normal work hours... Without using hibernate, can i get my pc to wake up on it's own at a certain time each weekday?

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• Problem accessing MICROSOFT##SSEE database (Error: 18456, Severity: 14, State: 16.)

  - by Philipp Schmid

  After an unexpected server shutdown due to a power failure, I can no longer connect to the internal windows database MICROSOFT##SSEE which is hosting Central Admin for my SBS 2008 server. The log shows: Error: 18456, Severity: 14, State: 16. Login failed for user 'NT AUTHORITY\NETWORK SERVICE'. [CLIENT: <named pipe>] I've tried to connect using the SQL Management studio (connecting to .pipemssql$microsoft##sseesqlquery) but no luck. The SQL Server Configuration Manager doesn't show a entry for 'Protocols for MICROSOFT##SSEE' (but shows it for 2 other database hosted on the same SQL server 2005 Express edition. I have tried to restore the master.ldf and mastlog.log files from a backup, but the issue persists.

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• Windows 7 x64 Hard Freezing (again)

  - by Lanissum

  Awhile ago, my computer was randomly freezing a few minutes after booting, and I ended up replacing the CPU and mobo after testing the RAM and hard drive, I also couldn't find anything wrong with the video card. So after replacing the presumably faulty hardware, everything worked fine for about a month and a half. All of a sudden, My computer is randomly freezing a few minutes after loading up any intensive application (games, mostly). Most of the time it just freezes with the current frame until I hard reset, although once it printed a BSOD message stating that dxgmms1.sys was to blame. The only difference between these two episodes I can think of is that I can do word/internet/work without issue now, as opposed to the near uselessness my computer was rendered last time. For those of you who want to know, I tested my memory with memtest86 (for 64 bit machines). I can't figure out what could have started this latest round of issues, the event logger just states that a kernel-power event has occurred (like last time) but I think thats just a generic "this machine has rebooted after a sudden shutdown" message.

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• Restoring files from blueprint on command

  - by Nick

  I am setting up a server. I already have rented a machine running centOS 6 but I have run into a bit of a technical problem with configuring the server software: The server will have some files that it will try to read/write to them but what I need is a way to have a blueprint of these files and everytime the server restarts the files that it used get deleted and replaced by the blueprints. I have heared of a RAM disks or Virtual File Systems but didnt quite understand how they work or how to set them up. The server software is written in java which means bash commands can be run from it. I cannot modify what happens when the server shuts down entirely what I can do is run a command before the server runs the final shutdown save

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• upstart not working

  - by dorelal

  I saved the following file at /etc/init/nodejs.conf description "node.js server" author "dorelal" start on startup stop on shutdown script # We found $HOME is needed. Without it, we ran into problems export HOME="/root" exec /usr/local/bin/node /home/dorelal/nodejs.js 2>&1 >> /var/log/node.log end script Then I tried to start the server > sudo initctl start nodejs initctl: Unknown job: nodejs Ubuntu information > cat /etc/lsb-release DISTRIB_ID=Ubuntu DISTRIB_RELEASE=9.10 DISTRIB_CODENAME=karmic DISTRIB_DESCRIPTION="Ubuntu 9.10" What do I need to do to start the server using upstart.

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• how to manage credentials/access to multiple ssh servers

  - by geoaxis

  I would like to make a script which can maintain multiple servers via SSH. I want to control the authentication/authorization in such a manner that authentication is done by gateway and any other access is routed through this ssh server to internal services without any further authentication/authorization requirements. So if a user A can log into server_1 for example. He can then ssh to server_2 without any other authentication and do what ever he is allowed to do on server_2 (like shut down mysql, upgrade it and restart it. This could be done via some remote shell script). The problem that I am trying to solve is to come up with a deployment script for a JavaEE system which involves databases and tomcat instances. They need to be shutdown and re-spawned. The requirement is to have a deployment script which has minimal human interaction as possible for both developers and operation.

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• AuthInfoRequired cups overwrites

  - by mooscape

  My problem is basically identical to the following: http://bbs.archlinux.org/viewtopic.php?id=61826 Put simply, I have a machine in ubuntu trying to connect to another ubuntu machine via a network in order to use the printer attached. There is no problem printing until I restart the guest machine. Immediately it overwrites the printers.conf file (under /etc/cups/printers.conf). It always adds the same line: AuthInfoRequired username,password I stop cups and change it to *#*AuthInfoRequired username,password to comment out the command. Start cups. Works great 'til the next shutdown. Then it gets overwritten again. Googling indicates it may be GTK problem and not CUPS, but I have found no permanent solution to date. Any suggestions appreciated ....

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• Are there any benefits to using a Distributed vSwitch for iSCSI?

  - by dunxd

  I am designing our vSphere farm - we'll be migrating from ESX 3.5 to 4.1. I plan to set up a new farm using ESXi 4.1, and move the Virtual Machines on the 3.5 farm into it by shutdown, then import. In ESX 3.5 there is no distributed networking, so each host has a vSwitch connected to my SAN NICs, and a port group for the vmkernel. In vSphere (ESXi 4.1) I have the extra option to set up a distributed vSwitch and distributed port groups for vmkernel to access iSCSI storage. Is there any benefit to this, or should I stick to non-distributed networking for iSCSI.

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• I setup vsftpd on ubuntu server on my ec2 instance, how to connect using SSH?

  - by Blankman

  I connect to my ec2 instance using ssh so I don't have to login each time. I just installed vsftpd on the ubuntu server, but when I connect it obviously asks for my username and password. Since I connect using the ubuntu user that my AMI comes with, I don't even know the root password. Is there a way I can login via ftp using SSH? Or do I just create a user on the system for ftp purposes? I've locked ftp to my IP address, and I will shutdown the ftp service once I'm done as I dont need it running 99.99999% of the time.

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• Command to determine whether ZooKeeper Server is Leader or Follower

  - by utrecht

  Introduction A ZooKeeper Quorum consisting of three ZooKeeper servers has been created. The zoo.cfg located on all three ZooKeeper servers looks as follows: maxClientCnxns=50 # The number of milliseconds of each tick tickTime=2000 # The number of ticks that the initial # synchronization phase can take initLimit=10 # The number of ticks that can pass between # sending a request and getting an acknowledgement syncLimit=5 # the directory where the snapshot is stored. dataDir=/var/lib/zookeeper # the port at which the clients will connect clientPort=2181 server.1=ip1:2888:3888 server.2=ip2:2888:3888 server.3=ip3:2888:3888 It is clear that one of the three ZooKeeper servers will become the Leader and the others Followers. If the Leader ZooKeeper server has been shutdown the Leader election will start again. The aim is to check if another ZooKeeper server will become the Leader if the Leader server has been shut down. Question Which command needs to be issued to check whether a ZooKeeper server is a Leader or a Follower?

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