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  • Virtual DNS recommended setup...

    - by luison
    Hi. We are new to virtualization which we are setting up with Proxmox VE (OpenVZ + KVM). I am a bit lost about the recommended DNS forwarder config specially in the OpenVZ (Virtuosso type) of enviroiment. Our intention was to have a small dnsmasq running in one of the VM acting as backup DHCP server and serving our in-office local addresses (and PCs) by an additional resolve.conf file which dnsmasq supports, but I've read that all VM should share DNS pointing to the host machine in which case it would make more sense having it there. My problem is that I would like to have as least as possible apps in the host so a reinstall of the environment (porxmox ve) and a machine restore can be as quick as possible. Does anyone have a similar setup? Does it make sense to have the 1st virtual machine running the local dns forwarder? Also... dnsmasq seems to want to have root permissions when running on an OpenVZ container... are there any work arrounds anyone knows for that.

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  • How can I mitigate DNS Server outages?

    - by Eric Belair
    Let's say I have a root domain of "mysite.com". That domain and its sub-domains have DNS served by an external service - let's call them Setwork Nolutions. If this external company is hit with a DDoS attack, my interally-hosted websites under this domain are no longer accessible at "mysite.com" or "*.mysite.com", even though the website(s) is/are fully up and operational. How can I mitigate such a problem so as to keep end users happy? The only solution others at my company have come up with is to create a second domain - i.e. "mysite2.com", and host its DNS at another company, and then communicate to all end users that this is the website they should use. I think this is ridiculous, and just leads to a bunch of other problems. I'd like to find a solution where we can point to the same website with the same URL without the original DNS host being operational. Any thoughts?

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  • Does Ubuntu 12.04.1 come with everything I need for using virtual servers and are the tools efficient?

    - by orokusaki
    I noticed that Ubuntu 12.04.1 comes with Xen, OpenStack, KVM and other virtualization-related tools. I have used VMWare in the past. If I was to use Xen for visualization, would I see considerable performance lost, since Xen is run on the host OS? Is it even run on the host OS, or is it like VMWare where it's installed below any Linux OS on the machine (embedded, I guess is the word)? Do you have any recommendations on what sort of set up to use with these built-in tools? I have 2 physical servers, side-by-side. Each will need a VM used for Postgres and a VM used as an app server. One will be a failover for the other.

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  • How to copy directories using debugfs?

    - by STM
    The debugfs manpage gives the impression that the command 'rdump . .' will recursively copy all files found on the specified filesystem from the debugfs cwd to the native filesystem's cwd. Instead I seem to receive a syntax error, and no copy is initiated? These are the commands I run: cd /path/to/transfer/destination debugfs /dev/sda1 -R rdump . . My task is to copy the entire contents of a clean yet unmountable USB storage device to its host machine's HD. The host machine does not support the inode size used by the USB device's filesystem (256) and its software is not upgradeable, so my intention was to use debugfs to transfer the files. If anyone has any other suggestions for this task I'd be grateful.

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  • Nagios3 gives a warning on HTTP service monitoring

    - by Dez
    Already set up my local net configuration to be monitored by Nagios3. I found a problem that Nagios3 reports a warning in the HTTP monitoring service of a Debian server set at ip 192.168.1.52, that has an individual virtual host and a mass virtual host for application development. I get this status message: HTTP WARNING: HTTP/1.1 404 Not Found I used the Nagios tools to check. servername is the name of the vhost server name I used in the Apache configuration. /usr/lib/nagios/plugins/check_http -H servername -I 192.168.1.52 receiving this status message: HTTP OK HTTP/1.1 200 OK - 37900 bytes in 0.504 seconds |time=0.503946s;;;0.000000 size=37900B;;;0 But when I check like this: /usr/lib/nagios/plugins/check_http -I 192.168.1.52 I get the same status message as the warning, so I assume that I don't have Nagios completely well set up because doesn't recognize the vhosts for that server, how it should be as the check_http service shows. Where should I look to fix that warning?

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  • Allow image upload - most efficient way?

    - by K-P
    Hey everyone, In my site, I currently only allow users to import images from other sites rather than uploading it themselves. The main reason for this is because I don't have much storage space on my host (relatively speaking). The host charges quite a bit for additional space. What are the alternatives to hosting images users upload (max 1mb size). Would it be a good idea to purchase separate cheap hosting with "unlimited space" (I know that's not true, but I'm guessing it's more than 1gb)? Or are there some caveats with this approach (e.g. security since the site should not be browsable, but accessed via another server)? Are there alternative ideas that I could employ? Thanks for any suggestions

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  • setting up rhel 5.x RPM build server for mortal users

    - by Chen Levy
    My task is to setup a RHEL 5.x build host, that can build RPMs for mortal users. On RHEL 6.x with rpm version 4.8, I have in /usr/lib/macros: # Path to top of build area. %_topdir %{getenv:HOME}/rpmbuild On RHEL 5.x with rpm version 4.4, the %{getevn:HOME} is not available. I know that I can use /home/someuser/.rpmmacros: %_topdir /home/someuser/rpmbuild and this will work for that user, however I don't want to do this for every user separately. Moreover, since .rpmmacro will not expand ${HOME} or ~ I suspect it is unsafe to use those. This in turn make /etc/skel unstable for this task (or so I suspect). So in short, my question is: How to setup RHEL 5.x host that allow all users to build RPM packages in their home directory?

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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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  • private address in traceroute results

    - by misteryes
    I use traceroute to check paths on a remote host, and I notice that there are some private IPs, like 10.230.10.1 bash-4.0# traceroute -T 132.227.62.122 traceroute to 132.227.62.122 (132.227.62.122), 30 hops max, 60 byte packets 1 194.199.68.161 (194.199.68.161) 1.103 ms 1.107 ms 1.097 ms 2 sw-ptu.univ.run (10.230.10.1) 1.535 ms 1.625 ms 2.172 ms 3 sw-univ-gazelle.univ.run (10.10.20.1) 6.891 ms 6.937 ms 6.927 ms 4 10.10.5.6 (10.10.5.6) 1.544 ms 1.517 ms 1.518 ms why there are private addresses near the host? what are the purposes that these private addresses are used? I mean why they want to put the public IP behind private IPs? thanks!

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  • Exchange 2013 Virtual Machine: Backup just mailboxes and clear logs

    - by Ben Curtis
    I have a Windows Server 2012 machine running Exchange 2013 running as a KVM virtual machine. For my VM guests, I do full image based backups from the host, so that I can quickly restore to any host server simply by copying over the disk image files. This means I don't need a nightly full system backup. That being said, without running a VSS Full Backup, the Exchange logs get massive (Specifically, the performance logs which are 500MB a day). In addition, I would also like to have a nightly backup of just the mail database. What is the best way to accomplish this? A full backup of the C:\Program Files\Microsoft\Exchange Server\V15 folder as I found in one tutorial did not clear out the logs. Thanks, Ben

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  • MySQL slave server not removing old relay binlogs

    - by MKzero
    I have a MySQL server with slave replication on another host. Today I stumbled across the high disk usage of the slave host and invastigated what takes up all the space. As it turns out this space is occupied by the slaves relay logs. I tried to turn the expire_logs_days variable down and restarted the MySQL daemon but the reported disk space stays the same. I could't really find anything exept that FLUSH LOGS should clear old logs. I tried that with no result. Is there any way I can reduce the disk space that the relay logs take?

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  • Virtual machine on ubuntu

    - by MITHIYA MOIZ
    I have configured virtual machine on ubuntu with the help of below article, https://help.ubuntu.com/9.04/serverguide/C/libvirt.html I managed to finish all the part except the major portion getting virtual host to talk to real network, Which I guess should be done only via bridge interface. Via virtual machine manager I try to choose any interface it gives me interface not bridged When I try to bridge the interceface eth0 as below auto br0 iface br0 inet static address 192.168.0.223 network 192.168.0.0 netmask 255.255.255.0 broadcast 192.168.0.255 gateway 192.168.0.1 bridge_ports eth0 bridge_fd 9 bridge_hello 2 bridge_maxage 12 bridge_stp off I cannot communicate with this interface to network, host server looses all the communication to network. But when I remote bridge interface from /etc/network/interfaces And configure eth0 as below it works fine The primary network interface auto eth0 iface eth0 inet static address 192.168.0.223 netmask 255.255.255.0 network 192.168.0.0 broadcast 192.168.0.255 dns-nameservers 62.215.6.51 gateway 192.168.0.1 how can i setup bridge interface correctly and how would my /etc/netwrok/interfaces file would look a like.

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  • OpenLDAP with StartTLS broken on Debian Lenny

    - by mr.zog
    I'm trying to get OpenLDAP on Lenny to work with StartTLS. I have a Fedora 13 machine which I'm using as a client for testing. So far the Fedora client is ignoring the 'host' directive in /etc/ldap.conf when I try to connect using ldapsearch. The client wants to connect to 127.0.0.1:389 even if I specify -H ldaps://server.name on when using ldapsearch. /etc/ldap.conf on the client machine is in mode 444. But even when I try connecting locally from an ssh session, I see errors like this: ldap_sasl_interactive_bind_s: Can't contact LDAP server (-1) Someone hit me with a cluebat, plz. Update: you must use ~/.ldaprc for settings such as 'host'. Also, I just used nmap against the ldap server and it showed 636 and 389 in an open state. Here's what prints to screen when I try to connect with, ldapsearch -ZZ –x '(objectclass=*)'+ -d -1 ldap_create ldap_extended_operation_s ldap_extended_operation ldap_send_initial_request ldap_new_connection 1 1 0 ldap_int_open_connection ldap_connect_to_host: TCP 192.168.10.41:636 ldap_new_socket: 3 ldap_prepare_socket: 3 ldap_connect_to_host: Trying 192.168.10.41:636 ldap_pvt_connect: fd: 3 tm: -1 async: 0 ldap_open_defconn: successful ldap_send_server_request ber_scanf fmt ({it) ber: ber_dump: buf=0x9bdbdb8 ptr=0x9bdbdb8 end=0x9bdbdd7 len=31 0000: 30 1d 02 01 01 77 18 80 16 31 2e 33 2e 36 2e 31 0....w...1.3.6.1 0010: 2e 34 2e 31 2e 31 34 36 36 2e 32 30 30 33 37 .4.1.1466.20037 ber_scanf fmt ({) ber: ber_dump: buf=0x9bdbdb8 ptr=0x9bdbdbd end=0x9bdbdd7 len=26 0000: 77 18 80 16 31 2e 33 2e 36 2e 31 2e 34 2e 31 2e w...1.3.6.1.4.1. 0010: 31 34 36 36 2e 32 30 30 33 37 1466.20037 ber_flush2: 31 bytes to sd 3 0000: 30 1d 02 01 01 77 18 80 16 31 2e 33 2e 36 2e 31 0....w...1.3.6.1 0010: 2e 34 2e 31 2e 31 34 36 36 2e 32 30 30 33 37 .4.1.1466.20037 ldap_write: want=31, written=31 0000: 30 1d 02 01 01 77 18 80 16 31 2e 33 2e 36 2e 31 0....w...1.3.6.1 0010: 2e 34 2e 31 2e 31 34 36 36 2e 32 30 30 33 37 .4.1.1466.20037 ldap_result ld 0x9bd3050 msgid 1 wait4msg ld 0x9bd3050 msgid 1 (infinite timeout) wait4msg continue ld 0x9bd3050 msgid 1 all 1 ** ld 0x9bd3050 Connections: * host: 192.168.10.41 port: 636 (default) refcnt: 2 status: Connected last used: Sun Jun 6 12:54:05 2010 ** ld 0x9bd3050 Outstanding Requests: * msgid 1, origid 1, status InProgress outstanding referrals 0, parent count 0 ld 0x9bd3050 request count 1 (abandoned 0) ** ld 0x9bd3050 Response Queue: Empty ld 0x9bd3050 response count 0 ldap_chkResponseList ld 0x9bd3050 msgid 1 all 1 ldap_chkResponseList returns ld 0x9bd3050 NULL ldap_int_select read1msg: ld 0x9bd3050 msgid 1 all 1 ber_get_next ldap_read: want=8, got=0 ber_get_next failed. ldap_err2string ldap_start_tls: Can't contact LDAP server (-1)

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  • Apache: how to set custom 401 error page and save original behaviour

    - by petRUShka
    I have Kerberos-based authentication with Apache/2.2.3 (Linux/SUSE). When user is trying to open some url, browser ask him about domain login and password like in HTTP Basic Auth. If user cancel such request 3 times Apache returns 401 Authorization Required error page. My current virtual host config is <Directory /home/user/www/current/public/> Options -MultiViews +FollowSymLinks AllowOverride None Order allow,deny Allow from all AuthType Kerberos AuthName "Domain login" KrbAuthRealms DOMAIN.COM KrbMethodK5Passwd On Krb5KeyTab /etc/httpd/httpd.keytab require valid-user </Directory> I want to set nice custom 401 error page with some instructions for users. And I added such line in virtual host config: ErrorDocument 401 /pages/401 It works, when user can't authorize apache redirects him to my nice page. But Apache doesn't ask user login\password as it did before. I want this functionality and nice error page simultaneously! Is it possible to make it works properly?

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  • Netinstalling CentOS if the gateway is in a different subnet

    - by James Lawrie
    I have a KVM host (A) running a virtual machine (B). They each have their own external IP address and the networking is setup using bridging between eth0 and br0 on A. B uses eth0, with A being the gateway. The problem is that the two external IP addresses are on different subnets (different /8s in fact) so by default, B claims it cannot reach A (Network Unreachable). I can resolve this by adding a static route on B: echo "any host gateway_ip dev eth0" > /etc/sysconfig/static-routes Modifying /etc/init.d/networking to reload the gateway after applying static routes (I only added the final line before fi): if [ -f /etc/sysconfig/static-routes ]; then grep "^any" /etc/sysconfig/static-routes | while read ignore args ; do /sbin/route add -$args done route add default gw "${GATEWAY}" fi If I then restart networking, it comes online. How can I do this (or work around it some other way) prior to the system being installed, ideally inside an Anaconda kickstart file?

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  • VMware Virtual vCenter and High Availability

    - by rufo
    To continue with this question: Should be Vmware vCenter server high available? According to the response there even if vCenter is down HA will continue to work. So, if my vCenter is a VM, using the express sql edition in the same VM, and that VM is hosted in the same cluster it manages (and the cluster is setup for HA): Am I correct to assume that if the host that hosts the vCenter goes down HA will vmotion the vCenter VM to another host and it will continue to function? BTW: my environment is small, two ESXi 5.0 hosts, with about 50 VMs, using iSCSI shared storaged for everything.

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  • proxy.pac file performance optimization

    - by Tuinslak
    I reroute certain websites through a proxy with a proxy.pac file. It basically looks like this: if (shExpMatch(host, "www.youtube.com")) { return "PROXY proxy.domain.tld:8080; DIRECT" } if (shExpMatch(host, "youtube.com")) { return "PROXY proxy.domain.tld:8080; DIRECT" } At the moment about 125 sites are rerouted using this method. However, I plan on adding quite a few more domains to it, and I'm guessing it will eventually be a list of 500-1000 domains. It's important to not reroute all traffic through the proxy. What's the best way to keep this file optimized, performance-wise ? Thanks

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  • php server settings for restrict post queries

    - by Korjavin Ivan
    I have php script on hosting, which receive big data with ajax/post. Just now, after some works on hosting, I see that script is broken. I checked with curl: file temp1: user_avatar=&user_baner=&user_sig=.... 237 chars total, and curl -H "X-Requested-With: XMLHttpRequest" -X POST --data @temp1 'http://host/mypage.php' works perfect. But with file temp2: name=%D0%9C%D0%B5%D0%B1%%B5%D0%BB%D1%8C%D0%A4%%B0%D0%B1%D1%80%D0%B8%D0%BA%D1%8A&user_payed=0000-00-00&...positions%5B5231%5D=on total chars: 65563 curl -H "X-Requested-With: XMLHttpRequest" -X POST --data @temp2 'http://host/mypage.php' curl return nothing. Looks like a problem with apache/php/php.ini or something like that. I check .htaccess php_value post_max_size 20M Which other parameters I should check? Is it possible that %BO encode kill php/apache? Or total number of parameters (about 2800) ?

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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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  • Apache can't connect to LDAP server

    - by jldugger
    I'm tying SVN to LDAPS by way of Apache. I've run openssl s_client --host $host --port 636 and received an SSL certificate, so it doesn't appear to be a firewall problem. I get the following warning: [Fri Apr 02 07:38:15 2010] [warn] [client <ip withheld>] [590] auth_ldap authenticate: user jldugger authentication failed; URI /internal-svn [LDAP: ldap_simple_bind_s() failed][Can't contact LDAP server] "Can't contact LDAP server" is somewhere between vague and wrong. I'm at a loss on how to continue debugging this. Ideas?

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  • How to prevent mod_proxy from rewriting redirects into absolute URLs?

    - by Yang
    I have: nginx (port 80) reverse-proxying to apache2 (port 88) reverse-proxying to a web app (port 5001). However, when the web app responds with a redirect like Location: /foo, apache2 rewrites this into Location: http://host.com:88/sub/foo, even though port 88 is publicly inaccessible. I'd like it to just redirect to the relative URL Location: /sub/foo. Any ideas? My apache config (using mod_proxy_http, mod_proxy_html, mod_substitute): <Location /notes/> Allow from all ProxyPass http://127.0.0.1:5001/ SetOutputFilter proxy-html ProxyPassReverse / ProxyHTMLURLMap / /notes/ RequestHeader unset Accept-Encoding AddOutputFilterByType SUBSTITUTE application/atom+xml Substitute "s|127.0.0.1:5001|host.com/notes|" </Location>

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  • Bridging VirtualBox over OpenVPN TAP adapter on Windows

    - by Sean Edwards
    I'm trying to configure a virtual machine (VirtualBox guest running Backtrack 4) with a bridged adapter over a VPN connection. The VPN is is hosted by the cybersecurity club at my university, and connects to a sandboxed LAN designed for penetration testing against various servers that the club has built. My host (Windows 7 Ultimate) connects to the VPN fine and is assigned an IP through DHCP, but for some reason the VM can't do the same thing, and I'm not sure why. It's like OpenVPN is filtering out packets from the MAC address it doesn't recognize. I want the virtual machine to bridge over the VPN connection, because our IT office has very strict policies about what you can and can't do on the network. I want to be able to run active attacks (ARP spoofing, nmap, Nessus scans) in the sandbox environment without risking the traffic accidentally going over the university network and getting my internet access revoked. Bridging over the VPN connection and running all attacks from inside the VM would solve that problem. Any idea why the host can use this interface, but the VM can't?

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  • Can PHP be run in Apache via mod_php and mod_fcgi side by side?

    - by Mario Parris
    I have an existing installation of Apache (2.2.10 Windows x86) using mod_php and PHP 5.2.6. Can I run another site in a virtual host using FastCGI and a different version of PHP, while stilling running the main site in mod_php? I've made an attempt, but when I add my FCGI settings to the virtual host container, Apache is unable to restart. httpd.conf mod_php settings: LoadModule php5_module "C:\PHP\php-5.2.17-Win32-VC6-x86\php5apache2_2.dll" AddHandler application/x-httpd-php .php PHPIniDir "C:\PHP\php-5.2.17-Win32-VC6-x86" httpd-vhosts.conf fastcgi settings: <VirtualHost *:80> DocumentRoot "C:/Inetpub/wwwroot/site-b/source/public" ServerName local.siteb.com ServerAlias local.siteb.com SetEnv PHPRC "C:\PHP\php-5.3.5-nts-Win32-VC6-x86\php.ini" FcgidInitialEnv PHPRC "C:\PHP\php-5.3.5-nts-Win32-VC6-x86" FcgidWrapper "C:\PHP\php-5.3.5-nts-Win32-VC6-x86\php-cgi.exe" .php AddHandler fcgid-script .php </VirtualHost> <Directory "C:/Inetpub/wwwroot/site-b/source/public"> Options Indexes FollowSymLinks Includes ExecCGI AllowOverride All Order allow,deny Allow from all </Directory>

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  • Apache in front of tomcat on Railo proxy with ajp

    - by user1468116
    I'm trying to setup apache in front of the tomcat embedded in railo. I have this settings: <VirtualHost *:80> DocumentRoot "/var/www/myapp" ServerName www.myapp.test ServerAlias www.myapp.test ProxyRequests Off ProxyPass /app ! <Proxy *> Order deny,allow Allow from all </Proxy> ProxyPreserveHost On ProxyPassReverse / ajp://%{HTTP_HOST}:8009/ RewriteEngine On # If it's a CFML (*.cfc or *.cfm) request, just proxy it to Tomcat: RewriteRule ^(.+\.cf[cm])(/.*)?$ ajp://%{HTTP_HOST}:8009/$1$2 [P] My server.xml : <Host name="www.myapp.test" appBase="webapps" unpackWARs="true" autoDeploy="true" xmlValidation="false" xmlNamespaceAware="false"> <Context path="" docBase="/var/www/myapp" /> <Alias>myapp.test</Alias> </Host> The index is loaded, but if I try to load some internal page I got: The proxy server could not handle the request GET /report/myreportname. Reason: DNS lookup failure for: localhost:8009report Could you help me?

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  • Optimising bare-metal hypervisor installation

    - by Stephen
    what is the best way to install a bare metal hypervisor (i.e. to host multiple VM's)? I spoke to a friend and he is using a HP server to host all his VMs with VMware ESXi, but he installed the VMWARE esxi software on a flash card. He can then use his full hard disk capacity from each drive for the VMs. Is this a pretty standard setup when configuring a bare-metal hypervisor? How do you guys do it, and what is best?

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