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  • VMware ESXi 4 On-Disk Data Deduplication - possible and supported?

    - by hurikhan77
    Environment: We are running multiple web, database, and application servers which usually share a pretty common installation (gentoo linux) and similar configuration in VMware ESXi 4. The differences are usually only some installed features or differing component versions. To create a new server, I usually choose the most similar (by features) running server, rsync a copy of it into freshly mounted filesystems, run grub, reconfigure and reboot. Problem: Over time this duplicates many on-disk data blocks which probably sums up to several 10's of gigabytes. I suppose if I could use a base system as template with the actual machines based on top of that, only writing changed blocks to some sort of "diff image", performance should improve (increased cache hit rate) and storage efficiency should increase (deduplicated storage space). This would be similar to what ESXi already supports for RAM deduplication (page sharing). Question: Is there any way to easily do this on ESXi 4? I already share the portage tree via NFS but this would not work for the rootfs.

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  • mysql client fails to start on command line

    - by Mark Basmayor
    Hi, I have been using the mysql command line client a lot before but I suddenly start getting this error when I try to launch it. mysql: relocation error: mysql: symbol strmov_overlapp, version libmysqlclient_16 not defined in file libmysqlclient.so.16 with link time reference The only significant event that comes into my mind is updating from Ubuntu 9.10 to 10.4. I'm not sure if there's anything else that I did to mess it up. I tried uninstalling both the mysql server and mysql client like so but to no avail. sudo aptitude purge mysql-server-5.1 Any help will be much appreciated, thanks.

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  • IPv4 private address assignment

    - by helloworld922
    I'm working on a private network which uses static IPv4 addresses as well as DHCP addressing for the physical LAN network. At a previous company I worked at they would assign static addresses in the 10.*.*.* space and all DHCP/LAN addresses were assigned in the 192.168.*.* space. Both of these address spaces are defined in the IPv4 private address space and there were never any internal conflicts. From personal experience at home, school, at work, and pretty much any other machine I've dealt with extensively (Windows and a few Linux distros), the DHCP server would always by default choose an address from the 192.168.*.* address space. Now my question is can I rely on this behavior? Do DHCP servers always by default assign from the 192.168.*.* pool (or any pool other than the 10.*.*.* pool), leaving the 10.*.*.* pool free for private static addressing? If not, under what conditions might a DHCP server choose an address in the 10.*.*.* address space?

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  • Bacula Director and Storage in LAN

    - by B14D3
    I have two networks LAN and DMZ.. Machines in DMZ are accesible from internet ( only over http). In LAN I have servers that see all LAN and all DMZ machines but machinse from DMZ don't see any LAN servers. Machines in LAN have access only to all LAN and DMZ, no direct access to internet and no access from internet. DMZ <------ LAN DMZ ----X--->LAN I'm planning to configure Bacula as major backup system. My plan is to install Bacula Director and Storage deamon on the same server in LAN for safety reasons. So my question is: Will this configuration work, is it posible for bacula director and storage deamon installed on server in LAN to makes backup servers that are in my DMZ? Or in this network configuration Bacula should be in DMZ? (If yes will I can backup with it servers in LAN ?)

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  • How can I install my installed linux on another hardware too?

    - by donamir
    Hi. It's my state: I installed some apps on a linux server(ubuntu). Apps stack are development tools: -some of Atlassian product -SVN, USVN -Maven, Artifactory -Tomcat & ... My problem: I want to create a bootable dvd to be able to restore same state(OS, configuration and apps) on another hardware(server). Some notes: I prefer ubuntu but my linux can be a different distributions if needed. w I prefer final result (bootable dvd) be simple and easy to use as installing a linux(ubuntu). I prefer a bootable DVD but if it's not possible, any other solution like partial backup/package even if needed to install first OS and then apply the package/backup/... can be good. Finally: Thanks in advance.

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  • Why is IIS 7.5 flushing file cache very often?

    - by Steffen
    We're running a Win 2008 R2 server with IIS 7.5 for serving image files. It's only used for static content, and file caching has been set up to cache files for 10 minutes. However the IIS frequently completely flushes the cache (seen by using Perfmon) It's not application pool recycling, it's not because the TTL has expired, so now I'm at a loss :-( I've included a screenshot of the perfmon graph where you can clearly see the issue. Is there anywhere I can see WHY it's doing these flushes ? (Note: I'm aware I could maybe detect it by attaching a debugger to the process, but that's not an option because it's a production server, and it cannot handle the slowdown a debugger would cause)

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  • Filename encoding broken after unzip on windows

    - by flammi88
    I zipped a directory on my linux server. Many files in the directory have german umlauts in their filename. The filesystem is ext3 and the system locale is set to de_DE.utf8. I used the following command to create the zip file: zip -r somezip.zip somefolder/ I transfered this file via WinSCP to my windows laptop and unzipped it. The issue: All filenames with german umlauts are broken. On my linux server the filenames are displayed correctly. I assume that I made a mistake when i created the zip file. Has someone any ideas how i can perserve the right filename encoding when I zip the files with the zip command on linux?

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  • What ports tend to be unfiltered by boneheaded firewalls?

    - by Reid
    Hi all, I like to be able to ssh into my server (shocking, I know). The problem comes when I'm traveling, where I face a variety of firewalls in hotels and other institutions, having a variety of configurations, sometimes quite boneheaded. I'd like to set up an sshd listening on a port that has a high probability of getting through this mess. Any suggestions? The sshd currently listens on a nonstandard (but < 1024) port to avoid script kiddies knocking on the door. This port is frequently blocked, as is the other nonstandard port where my IMAP server lives. I have services running on ports 25 and 80 but anything else is fair game. I was thinking 443 perhaps. Much appreciated! Reid

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  • Apache doesn't autostart because vpn isn't up yet.

    - by Col. Shrapnel
    I have a FreeBSD8 server, and VPN connection to my ISP. I use mpd5 and it works fine. A have an Apache server whch works fine, if I start it manually, after VPN is get up. But when I add it to rc.conf autostart, it fail to start, saying (49) can't assign requested address: make_sock could not bind to address I suppose it's because VPN isn't up yet and no IP address assigned to the interface which i set in the Listen directive in the httpd.conf. If i set Listen to the existing 127.0.0.1, it fail to serve wan requests. Is there a solution, either to delay apache autostart or configure it some different?

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  • Apache2 SSL And Passenger Configuration Issue

    - by Aditya Manohar
    I have the following virtual hosts configuration blocks. <VirtualHost *:80> DocumentRoot /var/www/html/TestApp/public/ <Directory /var/www/html/TestApp/public/> Allow from all Options -MultiViews </Directory> </VirtualHost> NameVirtualHost *:443 <VirtualHost *:443> DocumentRoot /var/www/html/TestApp/public/ <Directory /var/www/html/TestApp/public/> Allow from all Options -MultiViews </Directory> SSLEngine on SSLCertificateFile /etc/pki/tls/certs/server.crt SSLCertificateKeyFile /etc/pki/tls/private/server.key </VirtualHost> I trying to serve a Rails App off Passenger on Apache. The Problem: The TestApp works fine with Apache and Passenger when not using SSL When I use https://, I see the contents of /var/www/html The path to TestApp is /var/www/html/TestApp Any help will be much appreciated.

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  • What happens with the Guest OS's on ESXi in the event of a power failure?

    - by Jeremy Holovacs
    Many small businesses would prefer to let their server drop on power failure than to pay even $100 for a cheap UPS. It's often difficult to convince them of the value of something like that; it's why they like ESXi. It's free, they can save a lot of cash by putting a bunch of linux servers on one machine, and then I get paid. :) If the ESXi server experiences a power outage, it is set to come back on automatically when power is restored. What happens with the guest OS's? Ideally I would like them to all come online again as well, assuming they were on when power was lost, but I see no option for choosing this. I don't want to yank power to the system just to try it out, of course. I'm sure someone knows what happens by default, and perhaps how to make my system to work as I would wish.

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  • forwardfor information is missing

    - by FAFA
    I use following configuration to load balance https connections, using haproxy 1.4.8. SSL offloading is done by apache. listen ssl_to_waf 192.168.101.54:443 mode tcp balance roundrobin option ssl-hello-chk server wafA 192.168.101.61:444 check listen ssl_from_waf 192.168.101.61:445 balance roundrobin option forwardfor server webA 192.168.101.46:80 check For HTTP requests this works great, requests are distributed to my Apache servers just fine. But for HTTPS request, I lose the "forwardfor" information. I need to save the client IP address. How can I use HAproxy to load balance across a number of SSL servers, allowing those servers to know the client's IP address?

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  • Setup secure shared hosting (Apache, PHP, MySQL)

    - by Apaz
    So I'm setting up a shared hosting with Apache, PHP, MySQL and the biggest question mark is how to do with PHP, since there is a million options out there how to configure it securely. The plan is: Chroot for MySQL (built in support for chroot) Chroot for Apache (mod_security) Each user executing their PHP-scripts as their own user (see below) Set open_basedir Disable all "evil" php-functions (allow_url_fopen, system, exec, and so on) Ive looked at suexec and suphp but they seems very slow; http://blog.stuartherbert.com/php/2007/12/18/using-suexec-to-secure-a-shared-server/ http://blog.stuartherbert.com/php/2008/01/18/using-suphp-to-secure-a-shared-server/ So I've looked some more and found some other solutions: apache2-mpm-itk + mod_php(?) mod_fcgid + php-fpm mod_fastcgi + php-fpm Ive tried a simple setup with mod_fastcgi + php-fpm and it seems to work, runs as correct user and so on, but the protection against directory traveling is still open_basedir(?) One solution for that could be to use php-fpm's chroot option, but that causes a lot of other issues like domain name resolver does not work sending mail does not work Tips?

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  • Dovecot immediately logs off user

    - by nona urbiz
    I'm trying to set up email on my server, and have successfully set up POP3 with gmail for my main account. When attempting to set up another user though, gmail reports ` There was a problem communicating with dylanstestserver.com. I can't figure out why it's working for me and not the other users. I do receive email sent to the address on the server. One suggestion I found online was to try logging in over telnet, but strangely, it kicks me off right after I log in. dylan~$ telnet dylanstestserver.com 110 Trying 50.16.219.8... Connected to dylanstestserver.com. Escape character is '^]'. +OK Dovecot ready. user dylanstestemail +OK pass password +OK Logged in. Connection closed by foreign host. thanks for any ideas and help

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  • Using e-mail address as user name for SMTP and POP3

    - by PeterMmm
    I have a exim4 setup as SMTP. My user naming schema is to name all mail users for this server as m001, m002, m003, ... and then redirect to a real e-mail address with virtual domains. How can I allow my users to authenticate with exim to send mail using either their system user name (m001) or the email address ([email protected])? User login information for m001 are stored in linux system files (passwd, shadow). They are linked thru entries in a virtual address table for each domain that this server can serve: # /etc/exim4/virtual/example.com m001: [email protected] m002: [email protected] m003: [email protected] The same can be applied to qpopper ?

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  • Adding CNAME entry to nginx for cdn rewrite

    - by Ayaz Malik
    I am using apache + nginx (for serving static content) and just bought a CDN. I have added a CNAME entry to my CDN URL, which should be cdn.example.com and pointing to the original cdn url. xxx.netdna-cdn.com/ But probably because of my nginx vhost file when I run cdn.example.com, it opens the first server entry site in my vhost file. I have multiple sites in my server. I have added CNAME from CPanel DNS editor as well. No luck, so I think I need to add something in the vhost.conf.

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  • Issues with DHCP over multiple subnets

    - by Dan Monego
    I have a cisco router configured to handle multiple subnets (10.1.10.n, 10.2.10.n, etc), and an ubuntu system serving DHCP to the computers served by the router. After a restart of the DHCP, the systems on the 10.1 subnet are fine, but neither the server or the computers configured on the other subnets can see the router at 10.2.10.1 (or 10.3.10.1, or 10.4.10.1). The router can see itself at 10.2.10.1, however. The change that caused this was restarting the server, so I'm approaching it assuming the configuration error is on that end. Is that the likely issue or is there a different problem that would prevent the machines on the 10.2.10 subnet from resolving DHCP?

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  • Help me to set samba and apache on my Ubuntu VM from Vista, starting from ping

    - by avastreg
    Ok the title is not so clear after all, so let's start with the problem description posting some points: i'm on Win Vista i have a Virtual Box Ubuntu 9.04 server (Virtual Machine) installed in windows i'm under Active Directory (maybe helps), with network 192.168.2.x After Ubuntu installation (LAMP), i have: Ubuntu Ip set to 10.0.2.15 (dhcp) Vista pings Ubuntu and Ubuntu pings Vista (only IPs, not names) Can't connect to Apache (default install ubuntu server) at the url h**p://10.0.2.15/ On Ubuntu, testing Apache by doing 'wget http://10.0.2.15/' works Tried to setup samba, writing a share def, but nothing, i can't access from Vista to Ubuntu My scope is: Setting up samba to work on files from windows Reaching apache to test web pages Ok i'm not completely noob (but i'm on the noob way anyway) and i've tried many solutions, so please try to help me; let's look together what went wrong :)

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  • postfix uses hostname instead of myhostname.

    - by sunny.oxide
    Hi there, I am trying to set up an outgoing mail server for sending emails which is to relay to our ISP. In /etc/postfix/main.cf I have myhostname to ourcompany.example.com and myorigin and mydomain to $myhostname. ourcompany.example.com is resolvable. But looking at the logs in /var/log/maillog it appears that postfix does use the myhostname for the send address, but uses whatever from getmyhostname(), which is set to an internal DNS name since this is an internal server and we only send email out, but not handling incoming email. Any ideas?

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  • Linux kernel with grsec + Java / Apache Tomcat

    - by NoozNooz42
    I've got a Debian Linux 64 bit dedicated server. The kernel has the grsec patch applied. I'm mainly using this server to run Apache Tomcat (6.0.26, Java 6) and everything seems fine. The only issue, is that when I start Tomcat, I get a few of these: grsec: From xxx.xxx.xxx.xxx: Segmentation fault occurred at 00007fefe04e4000 in /home/t/jre1.6.0_20/bin/java[java:22403] uid/euid:1001/1001 gid/egid:1001/1001, parent /sbin/init[init:1] uid/euid:0/0 gid/egid:0/0 grsec: more alerts, logging disabled for 10 seconds Then no error logs anymore. Everything is fine. The kernel is: Linux 2.6.32.2-xxxx-grs-ipv4-64 #1 SMP Tue Dec 29 14:41:12 UTC 2009 x86_64 GNU/Linux And the webapp works fine. So there are segmentation fault when Tomcat starts, but everything seems to works fine. Is this concerning? Should I move to a non-grsec kernel?

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  • WordPress 3.5 Multisite and nginx siteurl issues

    - by Florin Gogianu
    I'm setting up multisite on localhost in subdirectories. The problem is that when I'm trying to access the dashboard of a site I just created ( localhost/wptest/site/wp-admin ) I get "This webpage has a redirect loop" and when I try to access the actual website ( localhost/wptest/site ) the page loads but without assets, such as css. When I access the network dashboard, or the primary site dashboard on localhost/wptest everything is just fine. Also when I edit the permalink of the second site in the network dashboard, to be like this: localhost/site it also runs fine. How to make it work with the default permalink structure localhost/wptest/site? The wordpress files are in /usr/share/html/wptest The wp-config.php is as follows: define('WP_ALLOW_MULTISITE', true); define('MULTISITE', true); define('SUBDOMAIN_INSTALL', false); define('DOMAIN_CURRENT_SITE', 'localhost'); define('PATH_CURRENT_SITE', '/wptest/'); define('SITE_ID_CURRENT_SITE', 1); define('BLOG_ID_CURRENT_SITE', 1); And the server block / virtual host is like this: server { ##DM - uncomment following line for domain mapping listen 80 default_server; #server_name example.com *.example.com ; ##DM - uncomment following line for domain mapping #server_name_in_redirect off; access_log /var/log/nginx/example.com.access.log; error_log /var/log/nginx/example.com.error.log; root /usr/share/nginx/html/wptest; index index.html index.htm index.php; if (!-e $request_filename) { rewrite /wp-admin$ $scheme://$host$uri/ permanent; rewrite ^(/[^/]+)?(/wp-.*) $2 last; rewrite ^(/[^/]+)?(/.*\.php) $2 last; } location / { try_files $uri $uri/ /index.php?$args ; } location ~ \.php$ { try_files $uri /index.php; include fastcgi_params; fastcgi_pass unix:/var/run/php5-fpm.sock; } location ~* ^.+\.(ogg|ogv|svg|svgz|eot|otf|woff|mp4|ttf|rss|atom|jpg|jpeg|gif|png|ico|zip|tgz|gz|rar|bz2|doc|xls|exe|ppt|tar|mid|midi|wav|bmp|rtf)$ { access_log off; log_not_found off; expires max; } location = /robots.txt { access_log off; log_not_found off; } location ~ /\. { deny all; access_log off; log_not_found off; } } And finally here's an error log: 2013/06/29 08:05:37 [error] 4056#0: *52 rewrite or internal redirection cycle while internally redirecting to "/index.php", client: 127.0.0.1, server: example.com, request: "GET /nginx HTTP/1.1", host: "localhost"

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  • Cannot access SWITCH thru VPN

    - by MadBoy
    I've VPN connection set up that i connect to company with. I can connect to all devices (other switches, routers, servers from same subnet with same settings just diffrent ip) but I can't connect to NetGear Router GS748Tv3. Settings on switch: IP address 192.168.1.8 Subnet mask 255.255.255.0 Default gateway 192.168.1.1 Management VLAN ID: 0 (1 - 4094 or 0) (0 means all VLANs) Switch has 2 VLAN's configured 1 and 2. I can access this switch thru VPN if i log in to server and from server to switch but this is a little bit slower then normal way. Anything I'm missing?

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  • Windows 7 stopped connecting to samba share

    - by Jan
    I have a problem with Windows 7 Home connecting to samba on linux server. It's worked fine for a year and without any changes in configuration or updates it suddenly stopped working. The strangest thing for me is that it stopped working for no reason that I could think of. After a few minutes after trying to connect I get: \\ip is not accessible. You might not have permission to use this network resource. Contact the administrator of this server to find out if you have access permissions. Other computers in that network (XP machines) connect to samba without any problem. I've tried adding LmCompatibilityLevel as described here: http://www.tomshardware.com/forum/75-63-windows-samba-issue , but it didn't help.

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  • Hot-swap drive got new name, can I change it on-the-fly?

    - by T.J. Crowder
    One of the HDDs in my server's RAID config failed, so I took it out of the array and had the data center hot-swap it. They've done that, but now the new drive is /dev/sdc rather than /dev/sda. I suspect — correct me if I'm wrong — that if I reboot the server, it will be /dev/sda again, so I'm hesitant to add it back to the array as /dev/sdc because I don't want to lay a trap for myself to fall into on the next reboot. I'd just as soon not reboot the server if I don't need to (if I do need to, well, too bad for me). Is there a way I can change the device name from /dev/sdc to /dev/sda without rebooting? This is on Ubuntu 10.04 LTS. It's an md array ("Linux Software RAID"), where currently one of the devices (there are a couple of them) looks like this ("degraded" because I've removed the old /dev/sda from it): # mdadm --detail /dev/md0 /dev/md0: Version : 00.90.03 Creation Time : Sun Oct 11 21:07:54 2009 Raid Level : raid1 Array Size : 97536 (95.27 MiB 99.88 MB) Used Dev Size : 97536 (95.27 MiB 99.88 MB) Raid Devices : 2 Total Devices : 1 Preferred Minor : 0 Persistence : Superblock is persistent Update Time : Thu Jun 30 09:31:16 2011 State : clean, degraded Active Devices : 1 Working Devices : 1 Failed Devices : 0 Spare Devices : 0 UUID : 496be7a5:ab9177ed:7792c71e:7dc17aa4 Events : 0.112 Number Major Minor RaidDevice State 0 8 17 0 active sync /dev/sdb1 1 0 0 1 removed Thanks, Update: Reading through the kernel md documentation, I suspect that if the name changes on reboot, it won't matter. (Good design, that.) Here's why: Boot time autodetection of RAID arrays When md is compiled into the kernel (not as module), partitions of type 0xfd are scanned and automatically assembled into RAID arrays. This autodetection may be suppressed with the kernel parameter "raid=noautodetect". As of kernel 2.6.9, only drives with a type 0 superblock can be autodetected and run at boot time. The kernel parameter "raid=partitionable" (or "raid=part") means that all auto-detected arrays are assembled as partitionable. I do have md compiled into the kernel, so I'm rebuilding the array now and will do the reboot to see what happens. Even if it works, the above doesn't answer the question I actually asked, so unless someone comes along and answers that question in the meantime (I'd be interested, even if it's not necessary for what I'm doing this very moment), I'll just delete the question to keep noise down.

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