virtual functions - Page 425

Shared FC LVM VG with LVs for each KVM VM. Clvm required?

- by Cocoabean

I have 2 virtual machine hosts running Ubuntu 12.04 and KVM managed with libvirt. They are both connected to the same VG which is a LUN on my SAN over FC. I provision LVs on this shared VG for each VM. I don't think I need HA or failover, but I do want live migration between the hosts. Do I need clvm in this case? As long as I don't try to start the same VM on each host should this work? Clvm requires lots of overhead with clustering tools that I don't think I need. I can deal with manually restarting VMs on other hosts in the event of a hardware failure.

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Why does Windows 7 need hardware virtualization to run XP mode?

- by Ken Pespisa

I have a MacBook Pro and I've run VMware Fusion's unity mode and Parallels' cohesion mode along side the Mac OS X, and both work pretty seamlessly. I figured XP Mode in Windows 7 would be something similar, but I then learned my machine requires hardware virtualization support, which it does not have. My machine is an HP dc7800. That's a dual core 2.2GHz machine with 4GBs of RAM. Certainly it has the horsepower to run a virtual environment alongside the primary OS. I'm wondering: 1) Why Microsoft decided to make hardware virtualization a requirement and 2) What am I missing? Is the experience similar to Parallel's cohesion mode / Fusion's unity mode? Thanks!

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Securing a local server physically

- by Daniele

We are an online business. We have a very powerful server with hard disk mirroring in our office that we are using for a variety of internal business-critical functions. We want to keep that machine in our office but we want to make sure it is as secure as possible (within reason). Obviously we are already backing it up everyday off-site. My question is more about not-too-expensive physical measures to protect the machine against thieves and disasters such as fire. What would you suggest?

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Apache security for multi-user development web server.

- by mrmartinblue

I've been searching and reading through documents all morning and understand that I need to use some combination of chown and probably 'jailing' to securely give programmers access to directories on my centos webserver. Here's the situation: I have an apache web server that has any number of virtual sites located in /var/www/site1 /var/www/site2 etc.. I have different developers that need full access both ssh and vsFTP to only the site they are working on. What is the best way to create and maintain security in this scenario. My thought would be to create a new user for each coder, jail that user to the website directory they are allowed to work in, add their user to a group and set the webroot's owner to that group. Any thoughts? Good, bad, ugly? Thanks!

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How to make AD highly available for applications that use it as an LDAP service

- by Beaming Mel-Bin

Our situation We currently have many web applications that use LDAP for authentication. For this, we point the web application to one of our AD domain controllers using the LDAPS port (636). When we have to update the Domain Controller, this has caused us issues because one more web application could depend on any DC. What we want We would like to point our web applications to a cluster "virtual" IP. This cluster will consist of at least two servers (so that each cluster server could be rotated out and updated). The cluster servers would then proxy LDAPS connections to the DCs and be able to figure out which one is available. Questions For anyone that has had experience with this: What software did you use for the cluster? Any caveats? Or perhaps a completely different architecture to accomplish something similar?

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esxi 5.1 - copy paste host config doesn't work?

- by w--

I followed these instructions for esxi 5.1 to enable copy paste from the host config. (search for "To enable this option for all the virtual machines in the ESX/ESXi host:") http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1026437 But copy and paste doesn't work for new VMs or existing VMs. Did I do something wrong somewhere? I've rebooted VMs and even rebooted host. I can confirm that if I do a per VM configuration, it works. Just not a central host config. Here is a screenshot of my /etc/vmware/config file

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Microsoft Forefront Management Gateway 2010 - Which topology to choose for monitoring only server?

- by MadBoy

Hello, I've installed Forefront and wanted to use it as monitoring traffic solution until we decide to put it as a router. I've 2 nic's assigned to this virtual machine. One NIC has connected port which is "mirror port" of our WAN redirected on switch so it sees all the network traffic flying by. The other NIC is internet access. This server is located inside our lan network. What topology should i choose and which options I should look at to be able to see which traffic is used (SMTP, WWW etc) and who does what? We had cases of infected machines with spam and we want to be able to see that some machine is sending large amounts of mails. Is that possible ?

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What are the mandatory Linux kernel modules to run inside of ESXi

- by Marcin

I'm used to rolling my own kernels for servers, as it nicely minimizes the number of exploits (and the resulting patches) to take care of. In a traditional (bare metal) world, the whole process is about knowing what you have (hardware), and what you need (Ethernet, IPv4, iptables, etc.) In a virtualized environment, some things stay the same (still need Ethernet and IPv4), some things go away (power management), and then there are some new needs (vxnet3, or vmware-tools, even though that's compiled outside of the kernel). So my question mostly concerns itself with the last two categories: what can I remove completely, and what new stuff do I want? For example, what IO scheduler do I want, if all my disk operations are going through another filesystem/scheduler/cache to get to the virtual disk? Do I need hyper-threading enabled, or is the VM going to show them to me anyway as a CPU anyway? Do I need Large Receive Offload turned on, or is that something that the hypervisor's network drivers are going to do for me?

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Need help configurating my Tomcat server

- by gablin

I just reinstalled my entire server, and now I can't seem to get my JSP-based website to work on Tomcat anymore. I use the same server.xml file, which worked perfectly before the reinstallation, but no longer. Here's the content of the server.xml file which worked before:  <Listener className="org.apache.catalina.core.AprLifecycleListener" SSLEngine="on" />  <Listener className="org.apache.catalina.core.JasperListener" />  <Listener className="org.apache.catalina.mbeans.ServerLifecycleListener" /> <Listener className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener" />  <GlobalNamingResources>  <Resource name="UserDatabase" auth="Container" type="org.apache.catalina.UserDatabase" description="User database that can be updated and saved" factory="org.apache.catalina.users.MemoryUserDatabaseFactory" pathname="conf/tomcat-users.xml" /> </GlobalNamingResources>  <Service name="Catalina">    <Connector port="8080" protocol="HTTP/1.1" connectionTimeout="20000" redirectPort="8443" />      <Connector port="8009" protocol="AJP/1.3" redirectPort="8443" />   <Engine name="Catalina" defaultHost="localhost">      <Realm className="org.apache.catalina.realm.UserDatabaseRealm" resourceName="UserDatabase"/>        <Host name="www.rebootradio.nu"> <Alias>rebootradio.nu</Alias> <Context path="" docBase="D:/services/http/rebootradio.nu" debug="1" reloadable="true"/> </Host> </Engine> </Service> </Server> The JSP site doesn't use any WAR files or anything like that; there's just a default.jsp in the specified folder D:/services/http/rebootradio.nu which loads the site. As I said, this configuration worked before, but now with the latest verion of XAMPP and Tomcat it doesn't work anymore. All I get is a 404 message saying The requested resource () is not available.

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Declaring multiple ports for the same VirtualHosts

- by user65567

Declare multiple ports for the same VirtualHosts: SSLStrictSNIVHostCheck off # Apache setup which will listen for and accept SSL connections on port 443. Listen 443 # Listen for virtual host requests on all IP addresses NameVirtualHost *:443 <VirtualHost *:443> ServerName domain.localhost DocumentRoot "/Users/<my_user_name>/Sites/domain/public" <Directory "/Users/<my_user_name>/Sites/domain/public"> Order allow,deny Allow from all </Directory> # SSL Configuration SSLEngine on ... </VirtualHost> How can I declare a new port ('listen', ServerName, ...) for 'domain.localhost'? If I add the following code, apache works (too much) also for all other subdomain of 'domain.localhost' (subdomain1.domain.localhost, subdomain2.domain.localhost, ...): <VirtualHost *:80> ServerName pjtmain.localhost:80 DocumentRoot "/Users/Toto85/Sites/pjtmain/public" RackEnv development <Directory "/Users/Toto85/Sites/pjtmain/public"> Order allow,deny Allow from all </Directory> </VirtualHost>

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Server freeze - how to debug

- by Petr Peller

I am running a Debian virtual server with Apache, PHP, MySQL. There is just 1 website with very low traffic running but the server very often (almost everyday) freezes and does not respond. When this happens the server is unreachable from web browser or by SSH and I have to go to administration of my provider and perform server hard reset after this the server seems to work fine. How can I find out what is causing the freezes? Linux vm2797 2.6.32-5-amd64 #1 SMP Tue Jun 14 09:42:28 UTC 2011 x86_64 GNU/Linux

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how to log trigger intiated CRUD queries on postgresql 8.4

- by user47650

in the postgresql config file there is an option log_statement = 'mod' which causes CRUD statements to be logged. However this does not include the CRUD statements that are called from trigger functions, which means that following the log file is not useful to determine what changes are being made to the database data, if the 3rd part application has been making lots of changes using triggers. Is there some other option I can use to include trigger CRUD? alternatively, can I inspect the pg_xlog in real time using some tool? (xlogdump and xlogviewer do not work with version 8.4, i have tried)

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Help with Apache rewriteengine rules

- by Vinay

Hello - I am trying to write a simple rewrite rule using the rewriteengine in apache. I want to redirect all traffic destined to a website unless the traffic originates from a specific IP address and the URI contains two specific strings. RewriteEngine On RewriteLog /var/log/apache2/rewrite_kudithipudi.log RewriteLogLevel 1 RewriteCond %{REMOTE_ADDR} ^199\.27\.130\.105 RewriteCond %{REQUEST_URI} !/StringOne [NC, OR] RewriteCond %{REQUEST_URI} !/StringTwo [NC] RewriteRule ^/(.*) http://www.google.com [R=302,L] I put these statements in my virtual host configuration. But the rewriteengine seems to be redirect all requests, whether they match the condition or not. Am I missing something? Thank you. Vinay.

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How do I recover files from my Windows 7 VirtualBox partition?

- by Kool Caveen Gmail

I have Windows Vista Installed on my laptop. I ran and created a virtual OS from VMware. Inside that OS, I created 2 partitions and stored the files on the second drive. Now my Windows 7 installed in VirtualBox has been corrupted and needs to be repaired. VirtualBox itself is not corrupted, but the Windows 7 that runs in VirtualBox is. Instead of repairing, I only want to get my data from this second partition. Is it possible?

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Nginx no static files after update

- by SomeoneS

First, i must say that i am not expert in server administration, my site was setup by hosting admins (that i cannot contact anymore). Few days ago, i updated Nginx to latest version (admin told me that it is safe to do). But after that, my site serves only html content, no CSS, images, JS. If i try to open some image i get message "Wellcome to Nginx" (same thin if i try to open static.mysitedomain.com). More details: Site has static. subdomain, but static files are in same directory as they used to be before setting up static files. I was googling for some solutions, i tried to change something in /etc/nginx/, but no luck. I feel that this is some minor configuration problem, any ideas? EDIT: Here is /etc/nginx/nginx.conf file content: user www-data; worker_processes 4; pid /var/run/nginx.pid; events { worker_connections 768; # multi_accept on; } http { ## # Basic Settings ## sendfile on; tcp_nopush on; tcp_nodelay on; keepalive_timeout 65; types_hash_max_size 2048; # server_tokens off; # server_names_hash_bucket_size 64; # server_name_in_redirect off; include /etc/nginx/mime.types; default_type application/octet-stream; ## # Logging Settings ## access_log /var/log/nginx/access.log; error_log /var/log/nginx/error.log; ## # Gzip Settings ## gzip on; gzip_disable "msie6"; # gzip_vary on; # gzip_proxied any; # gzip_comp_level 6; # gzip_buffers 16 8k; # gzip_http_version 1.1; # gzip_types text/plain text/css application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript; ## # nginx-naxsi config ## # Uncomment it if you installed nginx-naxsi ## #include /etc/nginx/naxsi_core.rules; ## # nginx-passenger config ## # Uncomment it if you installed nginx-passenger ## #passenger_root /usr; #passenger_ruby /usr/bin/ruby; ## # Virtual Host Configs ## include /etc/nginx/conf.d/*.conf; include /etc/nginx/sites-enabled/*; } Here is /etc/nginx/sites-enabled/default file content: server { #listen 80; ## listen for ipv4; this line is default and implied #listen [::]:80 default ipv6only=on; ## listen for ipv6 root /usr/share/nginx/www; index index.html index.htm; # Make site accessible from http://localhost/ server_name localhost; location / { # First attempt to serve request as file, then # as directory, then fall back to index.html try_files $uri $uri/ /index.html; # Uncomment to enable naxsi on this location # include /etc/nginx/naxsi.rules } location /doc/ { alias /usr/share/doc/; autoindex on; allow 127.0.0.1; deny all; } # Only for nginx-naxsi : process denied requests #location /RequestDenied { # For example, return an error code #return 418; #} #error_page 404 /404.html; # redirect server error pages to the static page /50x.html # #error_page 500 502 503 504 /50x.html; #location = /50x.html { # root /usr/share/nginx/www; #} # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000 # #location ~ \.php$ { # fastcgi_split_path_info ^(.+\.php)(/.+)$; # # NOTE: You should have "cgi.fix_pathinfo = 0;" in php.ini # # # With php5-cgi alone: # fastcgi_pass 127.0.0.1:9000; # # With php5-fpm: # fastcgi_pass unix:/var/run/php5-fpm.sock; # fastcgi_index index.php; # include fastcgi_params; #} # deny access to .htaccess files, if Apache's document root # concurs with nginx's one # #location ~ /\.ht { # deny all; #} } # another virtual host using mix of IP-, name-, and port-based configuration # #server { # listen 8000; # listen somename:8080; # server_name somename alias another.alias; # root html; # index index.html index.htm; # # location / { # try_files $uri $uri/ /index.html; # } #} # HTTPS server # #server { # listen 443; # server_name localhost; # # root html; # index index.html index.htm; # # ssl on; # ssl_certificate cert.pem; # ssl_certificate_key cert.key; # # ssl_session_timeout 5m; # # ssl_protocols SSLv3 TLSv1; # ssl_ciphers ALL:!ADH:!EXPORT56:RC4+RSA:+HIGH:+MEDIUM:+LOW:+SSLv3:+EXP; # ssl_prefer_server_ciphers on; # # location / { # try_files $uri $uri/ /index.html; # } #}

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Is a matching entry in /etc/hosts required for hostname?

- by JohnWoltman

I was installing a Tomcat webapp that refused to work until I stumbled on someone else's issue with an unrelated product. The solution was to add the machine's name to /etc/hosts, to match the name returned by hostname. Is this required for general Linux networking to function correctly? My webapp is running in a virtual machine so that I can test the webapp, and I don't normally bother with the /etc/hosts file on VMs. I just shook my fist and cursed Tomcat and webapp's behavior. I read http://serverfault.com/questions/118823, but that doesn't say if it's required or not.

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ESXI ftpput fails Syntax problem

- by Datapimp23

I'm trying to ftpput my virtual machines dirs to our NAS. Which doesn't support NFS. Only FTP and samba. So I'm in the ESXi console and enter the followin command ftpput ipaddress /vmfs/volumes/4a1157e1-be81171a-1b39-001d09080124/VMNAME /Backup /Backup is a public share on the nas, I can access it through any ftp client. After I enter I get the following ftpput: can't open 'Backup': No such file or directory I'm kind of in the dark here. Any suggestions?

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Virtualbox Ubuntu 10.04 on Windows 7: networking won't work

- by Herbert Roitblat

I have a virtualbox image that I created using libvirt from Ubuntu 10.04. It assigns a fixed IP address. I can start it up on my Windows 7 VirtualBox, but I cannot get networking to work. My colleague loaded the same image onto his Windows 7 and networking worked as a bridged connection. Therefore, I know that the image is good, it must be something about my Windows 7 installation. Any thoughts on where to look to get networking running in my virtual machine? Thanks, Herb

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Dell 2950 Perc 6/i "physical disk" and "Enclosure(Backplane)" under Connector 1 in OMSA tree- Troubleshoot help

- by user66357

Just looking for someone who might know why this could occur... In OMSA, on my Dell 2950, there usually is only one "Physical Disks" child under "Enclosure (Backplane)" in the tree view. Currently, the tree looks like this: Dell PERC 6/i Integrated Connector 1 (RAID) Enclosure (Backplane) Physical Disks (1:04 good, 1:05 removed) Physical Disks (1:33 Ready but unused) Normally it's like this: Connector 1 (RAID) Enclosure (Backplane) Physical Disks (1:04 good, 1:05 good) From the front, 6 of 6 3.5" SAS drives are connected. The server is showing Slot 5 as bad and the disk as removed. It seems that the drive in Slot 5 is being sensed as external to the Enclosure. Any ideas why this would happen? Think I can get away with rebuilding the virtual disk by replacing 1:05 with 1:33? Thanks.

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VPS for Glassfish

- by Harry Pham

Our small startup company plan to deploy a web application on Glassfish, I and wonder if some of the experience user out there can answer me couple question. When I shopping for server, I usually look at RAM amount, as GF does required good amount of RAM to run, below are the two sites with significant price different for the same amount of RAM. I wonder why?? Godaddy: http://www.godaddy.com/hosting/virtual-dedicated-servers.aspx?ci=9013 Versus http://entic.net/Servers Does below plan from Godaddy consider good to run GF application. OS: Linux CentOS • RAM: 4 GB • Storage: 60 GB • Bandwidth: 2,000 GB/mo Our web application is a social network, expected to have 2000-4000 users to start with

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Is there a version of Debian-Lenny that is legal for export from the US?

- by molecules

I wanted to bundle my application in a Debian-Lenny Virtual Machine so others could download it and run it without having to configure anything. However, I don't want to have to worry about US legal issues. Many of the packages in a default Debian installation include encryption algorithms. Are all default versions export-safe? If not, is there an export-safe version? If not, is there an easy way to make one?

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Configuring port forwarding on Fortigate 50B

- by GomoX

I can't for the life of me get port forwarding to work on my Fortigate 50B. I followed the setup tips described on this other SF thread with no success. The only specific difference I can find is we are using load balancing through 2 different internet uplinks. Is there any caveat specific to this scenario that I might be missing? If you need any specific additional information please ask because I think I have checked everything: Virtual IP mapping on external interface wan1 ACCEPT all from any on wan1 to the corresponding server on internal No seeming offending firewall rules (any specific pitfalls that I might want to check for?)

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Running a webserver behind a firewall I have no access to

- by reijin

I'm having a bad time in my student appartment: I want to run a webserver on my Laptop, which should be reachable from outside of the net. I'm sitting behind some proxy-server that passes outgoing packets to the matching server. But when it comes to incoming messages - it wouldn't route them correctly to my PC. (Seems like packets only get passed if some PC from within the student-flat is already connected to the sending server) In the past I had a small virtual private server that was sending incoming website-requests over a reverse shell to my PC. Which then returned the website content, and the visitor could see my website. Sadly I dont have that server anymore... Do you have any idea that might solve my problem? Greetings, Benedikt

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Tomcat 5.5 - multiple contexts using same path

- by ctn8iv

Is it possible to set up multiple contexts using the same path? For example: <Context docBase="/www/websites/site1/java/base" path="/base" reloadable="true"/> <Context docBase="/www/websites/site2/java/base" path="/base" reloadable="true"/> I have two sites that use the same path both running on the same server/IP. The sites use different virtual hosts and different ServerNames, but I have no control over the directory structure of the sites because they are maintained by a client. Until now, they have been content with only allowing one site to run at a time, but this is a major hassle, so I need to know if there's a workaround.

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organizing images by resolution with batch files

- by Anthony

Doing some digging I'm trying to figure out a command line solution for organizing very large archives of images based on their resolution into folders, 1920x1080, 1600x1200, 1600x900, etc. I've come across a few post on Superuser mentioning something called ImageMagick, is that the best method to the madness I'm trying to accomplish? I've never used any command line functions/applets/tools other then those that come from Microsoft. I'm rather new to command line usage but ive been enjoying the hell out of it using Powershell, xcopy and robocopy. I am slowly trying to push myself further into the Linux world with Ubuntu running on one of my physical machines as well as a virtual machine so that's an option as well.

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