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  • Apache: Redirect entire virtual host to a URL

    - by DrStalker
    Centos 5.2, Apache 2.2.3 I want to configure Apache to redirect any URL under mail.mydomain.com to the single URL https://mail.google.com/a/mydomain.com How can I set this up with Apache? I have LoadModule rewrite_module modules/mod_rewrite.so but I'm not sure how to actually use this and I can't find a really simple example; I assume I set up a new virtual host with some form of rewrite directive, but how is this done?

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  • Block IP Address including ICMP using UFW

    - by dr jimbob
    I prefer ufw to iptables for configuring my software firewall. After reading about this vulnerability also on askubuntu, I decided to block the fixed IP of the control server: 212.7.208.65. I don't think I'm vulnerable to this particular worm (and understand the IP could easily change), but wanted to answer this particular comment about how you would configure a firewall to block it. I planned on using: # sudo ufw deny to 212.7.208.65 # sudo ufw deny from 212.7.208.65 However as a test that the rules were working, I tried pinging after I setup the rules and saw that my default ufw settings let ICMP through even from an IP address set to REJECT or DENY. # ping 212.7.208.65 PING 212.7.208.65 (212.7.208.65) 56(84) bytes of data. 64 bytes from 212.7.208.65: icmp_seq=1 ttl=52 time=79.6 ms ^C --- 212.7.208.65 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 79.630/79.630/79.630/0.000 ms Now, I'm worried that my ICMP settings are too generous (conceivably this or a future worm could setup an ICMP tunnel to bypass my firewall rules). I believe this is the relevant part of my iptables rules is given below (and even though grep doesn't show it; the rules are associated with the chains shown): # sudo iptables -L -n | grep -E '(INPUT|user-input|before-input|icmp |212.7.208.65)' Chain INPUT (policy DROP) ufw-before-input all -- 0.0.0.0/0 0.0.0.0/0 Chain ufw-before-input (1 references) ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0 icmp type 3 ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0 icmp type 4 ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0 icmp type 11 ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0 icmp type 12 ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0 icmp type 8 ufw-user-input all -- 0.0.0.0/0 0.0.0.0/0 Chain ufw-user-input (1 references) DROP all -- 0.0.0.0/0 212.7.208.65 DROP all -- 212.7.208.65 0.0.0.0/0 How should I go about making it so ufw blocks ICMP when I specifically attempt to block an IP address? My /etc/ufw/before.rules has in part: # ok icmp codes -A ufw-before-input -p icmp --icmp-type destination-unreachable -j ACCEPT -A ufw-before-input -p icmp --icmp-type source-quench -j ACCEPT -A ufw-before-input -p icmp --icmp-type time-exceeded -j ACCEPT -A ufw-before-input -p icmp --icmp-type parameter-problem -j ACCEPT -A ufw-before-input -p icmp --icmp-type echo-request -j ACCEPT I'm tried changing ACCEPT above to ufw-user-input: # ok icmp codes -A ufw-before-input -p icmp --icmp-type destination-unreachable -j ufw-user-input -A ufw-before-input -p icmp --icmp-type source-quench -j ufw-user-input -A ufw-before-input -p icmp --icmp-type time-exceeded -j ufw-user-input -A ufw-before-input -p icmp --icmp-type parameter-problem -j ufw-user-input -A ufw-before-input -p icmp --icmp-type echo-request -j ufw-user-input But ufw wouldn't restart after that. I'm not sure why (still troubleshooting) and also not sure if this is sensible? Will there be any negative effects (besides forcing the software firewall to force ICMP through a few more rules)?

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  • Log and Block Website using Windows 2008 SBS

    - by John
    A client has asked me to setup Windows 2008 SBS to block and log websites from a list they will provide. As far as I know they only have standard edition which means I cannot use ISA. I was thinking of using squid authenticated against Active Directory. There is no budge for additional software. Does any one know of a different/better solution using either open source software or software that is available in Windows 2008 SBS? Thanks

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  • Building Python 3.2.3 on redhat 5: missing _posixsubprocess

    - by Oz123
    I am trying to build Python3 on a RHEL 5.7 machine, I successful managed to build Python 3.2.2, with : # Install required build dependencies yum install openssl-devel bzip2-devel expat-devel gdbm-devel readline-devel sqlite-devel # Fetch and extract source. Please refer to http://www.python.org/download/releases # to ensure the latest source is used. wget http://www.python.org/ftp/python/3.2/Python-3.2.tar.bz2 tar -xjf Python-3.2.tar.bz2 cd Python-3.2 # Configure the build with a prefix (install dir) of /opt/python3, compile, and install. ./configure --prefix=/opt/python3 make But I am failing (?) with Python 3.2.3: Failed to build these modules: _posixsubprocess Is this a problem that should bother me ? How do I build it? I found this patch, but it's not included in sources Python 3.2.3 I obtained from the website ... Applying this patch on my sources, didn't solve the problem ... Here is the output from stderr: ~/tmp/Python-3.2.3 $ make > build.log ldd: warning: you do not have execution permission for `/usr/local/lib/libreadline.so' /usr/bin/ld: skipping incompatible /usr/local/lib/libreadline.so when searching for -lreadline /usr/bin/ld: skipping incompatible /usr/local/lib/libreadline.a when searching for -lreadline /home/oznahum/tmp/Python-3.2.3/Modules/_posixsubprocess.c: In function '_close_open_fd_range_safe': /home/oznahum/tmp/Python-3.2.3/Modules/_posixsubprocess.c:205: error: 'O_CLOEXEC' undeclared (first use in this function) /home/oznahum/tmp/Python-3.2.3/Modules/_posixsubprocess.c:205: error: (Each undeclared identifier is reported only once /home/oznahum/tmp/Python-3.2.3/Modules/_posixsubprocess.c:205: error: for each function it appears in.) /usr/bin/ld: skipping incompatible /usr/local/lib/libz.so when searching for -lz /usr/bin/ld: skipping incompatible /usr/local/lib/libz.so when searching for -lz ~/tmp/Python-3.2.3 $ grep posix build.log gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -I. -IInclude -I./Include -DPy_BUILD_CORE -c ./Modules/posixmodule.c -o Modules/posixmodule.o ar rc libpython3.2m.a Modules/_threadmodule.o Modules/signalmodule.o Modules/posixmodule.o Modules/errnomodule.o Modules/pwdmodule.o Modules/_sre.o Modules/_codecsmodule.o Modules/_weakref.o Modules/_functoolsmodule.o Modules/operator.o Modules/_collectionsmodule.o Modules/itertoolsmodule.o Modules/_localemodule.o Modules/_iomodule.o Modules/iobase.o Modules/fileio.o Modules/bytesio.o Modules/bufferedio.o Modules/textio.o Modules/stringio.o Modules/zipimport.o Modules/symtablemodule.o Modules/xxsubtype.o building '_posixsubprocess' extension gcc -pthread -fPIC -fno-strict-aliasing -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -IInclude -I/home/oznahum/localroot/include -I. -I./Include -I/usr/local/include -I/home/oznahum/tmp/Python-3.2.3 -c /home/oznahum/tmp/Python-3.2.3/Modules/_posixsubprocess.c -o build/temp.linux-x86_64-3.2/home/oznahum/tmp/Python-3.2.3/Modules/_posixsubprocess.o _posixsubprocess

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  • Can someone explain RAID-0 in plain English?

    - by Edward Tanguay
    I've heard about and read about RAID throughout the years and understand it theoretically as a way to help e.g. server PCs reduce the chance of data loss, but now I am buying a new PC which I want to be as fast as possible and have learned that having two drives can considerably increase the perceived performance of your machine. In the question Recommendations for hard drive performance boost, the author says he is going to RAID-0 two 7200 RPM drives together. What does this mean in practical terms for me with Windows 7 installed, e.g. can I buy two drives, go into the device manager and "raid-0 them together"? I am not a network administrator or a hardware guy, I'm just a developer who is going to have a computer store build me a super fast machine next week. I can read the wikipedia page on RAID but it is just way too many trees and not enough forest to help me build a faster PC: RAID-0: "Striped set without parity" or "Striping". Provides improved performance and additional storage but no redundancy or fault tolerance. Because there is no redundancy, this level is not actually a Redundant Array of Inexpensive Disks, i.e. not true RAID. However, because of the similarities to RAID (especially the need for a controller to distribute data across multiple disks), simple strip sets are normally referred to as RAID 0. Any disk failure destroys the array, which has greater consequences with more disks in the array (at a minimum, catastrophic data loss is twice as severe compared to single drives without RAID). A single disk failure destroys the entire array because when data is written to a RAID 0 drive, the data is broken into fragments. The number of fragments is dictated by the number of disks in the array. The fragments are written to their respective disks simultaneously on the same sector. This allows smaller sections of the entire chunk of data to be read off the drive in parallel, increasing bandwidth. RAID 0 does not implement error checking so any error is unrecoverable. More disks in the array means higher bandwidth, but greater risk of data loss. So in plain English, how can "RAID-0" help me build a faster Windows-7 PC that I am going to order next week?

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  • Making hosts accessible between LAN subnets

    - by nixnotwin
    I have two inerfaces on my router with tomato firmwre: br0 and vlan4. br0 is on 192.168.0.0/16 subnet and vlan4 on 10.0.1.0/24 subnet. As I don't want the different network services on br0 available on vlan4, I have added this firewall rule: iptables -I INPUT -i vlan4 -j ACCEPT; iptables -I FORWARD -i vlan4 -o vlan2 -m state --state NEW -j ACCEPT; iptables -I FORWARD -i br0 -o vlan4 -j DROP; vlan2 is my WAN (internet acess). The issue that I want to solve is that I want to make one host from 192.168.0.0/16 network (br0), which has ip 192.168.0.50, available on vlan4 (10.0.1.0/24). Only that host should be available on vlan4 (and all other hosts on br0 should be inaccessible). What firewall rules can be used to do it? Edit 1: Output of iptables -nvL FORWARD: Chain FORWARD (policy DROP 4 packets, 204 bytes) pkts bytes target prot opt in out source destination 0 0 ACCEPT all -- vlan4 192.168.0.50 0.0.0.0/0 0.0.0.0/0 0 0 ACCEPT all -- vlan4 ppp0 0.0.0.0/0 0.0.0.0/0 state NEW 229 13483 ACCEPT all -- vlan4 vlan2 0.0.0.0/0 0.0.0.0/0 state NEW 0 0 DROP all -- br0 vlan3 0.0.0.0/0 0.0.0.0/0 0 0 ACCEPT all -- vlan3 ppp0 0.0.0.0/0 0.0.0.0/0 state NEW 67 3405 ACCEPT all -- vlan3 vlan2 0.0.0.0/0 0.0.0.0/0 state NEW 0 0 ACCEPT all -- br0 br0 0.0.0.0/0 0.0.0.0/0 34 1360 DROP all -- * * 0.0.0.0/0 0.0.0.0/0 state INVALID 758 40580 TCPMSS tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp flags:0x06/0x02 TCPMSS clamp to PMTU 11781 2111K restrict all -- * vlan2 0.0.0.0/0 0.0.0.0/0 26837 19M ACCEPT all -- * * 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED 0 0 wanin all -- vlan2 * 0.0.0.0/0 0.0.0.0/0 287 15927 wanout all -- * vlan2 0.0.0.0/0 0.0.0.0/0 283 15723 ACCEPT all -- br0 * 0.0.0.0/0 0.0.0.0/0 0 0 upnp all -- vlan2 * 0.0.0.0/0 0.0.0.0/0 Output of iptables -t nat -nvL PREROUTING: Chain PREROUTING (policy ACCEPT 6887 packets, 526K bytes) pkts bytes target prot opt in out source destination 855 83626 WANPREROUTING all -- * * 0.0.0.0/0 222.228.137.223 0 0 DROP all -- vlan2 * 0.0.0.0/0 192.168.0.0/16 0 0 DNAT udp -- * * 192.168.0.0/16 !192.168.0.0/16 udp dpt:53 to:192.168.0.1

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  • Displaying Unicode on Chrome vs Firefox

    - by abel
    Unicode Rendering: Firefox vs Chrome OS: Windows XP SP3 My question is about the rendering of this post on Firefox vs Chrome. I can see a lot of boxes on Chrome, not so much on Firefox. Firefox: Chrome: What do I do? Update: Update 2 Changed Sans Serif fonts on Chrome to Arial Unicode and restarted Update 3 This is inspired by @Arjan's references The smilies on Firefox(The reference smilies are the ones below) The smilies on Chrome(The reference smilies are the ones below) Update: The source of the above post is displayed as below Firefox Chrome

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  • Reverse proxy setup for distributed storage

    - by vise
    I have 4 file servers that I want to access under a single mount point from another server. This server has a web application that should serve content from the mounted point. I think I can achieve this with glusterfs. Considering that the file servers have fairly powerful hardware, I want to install a webserver on each of them and serve those files via a reverse proxy. Any thoughts on how I may be able to do so?

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  • Windows 8 Professional didn't come with Internet Explorer 10(Metro)

    - by Joel Dean
    When I installed Windows 8 Professional Edition I noticed that Internet Explorer 10 was missing. I tried to find some source to acquire the installer but none of the sites are providing it. One of my colleagues upgraded recently and he got the new Internet Explorer after his installation was completed. So is there a way to acquire the installer? Update: I should have mentioned that I was talking about the Metro version.

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  • Is Displayport preferable to DVI for monitor connections?

    - by Sliff
    I'm currently running a single Dell 24" (2408WFP) screen, but am considering adding a second. The problem I've got is that I'm currently using the DVI connector to the on board graphics, so will need to purchase a new graphics card. The 2408WFP also has HDMI and DisplayPort inputs, so I was wondering if DisplayPort is worth considering at present over DVI? On the same subject, does anyone actually manufacture reasonably priced DisplayPort cards - all I've managed to find seem to very expensive workstation cards aimed at financial/design/simulation markets.

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  • Which is faster, copying everything at once or one thing at a time?

    - by fredley
    I am transferring a bunch (20+) of large (1GB+) files to my external flash drive over USB 2.0. Is it quicker to just sling them all over at once (as in one at a time but not waiting for the previous transfer to finish) so that there are multiple transfers going on, or transfer one, wait for it to finish, transfer the next. The files are coming from a variety of locations so I can't do one single big transfer. Are there any other advantages to one way or the other that are worth considering?

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  • Windows 7 fails to install on KVM with qemu

    - by kief_morris
    I'm trying to install Windows 7 on a virtual machine on my 64 bit Ubuntu Karmic box. I get to the point of selecting my language settings and clicking 'install now', but a short while later I get a blue screen of death. I've tried a few variations, including using the 32 bit (fails very quickly). The virt-install command I've tried includes this: sudo virt-install --connect qemu:///system -n ksm-win7 -r 2048 \ --disk path=/home/kief/VM-Images/ksm-win7.qcow2,size=50 \ -c /var/Software/Windows7/Full/64bit/SW_DVD5_SA_Win_Ent_7_64BIT_English_Full_MLF_X15-70749.ISO \ --vnc --os-type windows --os-variant vista --hvm The limited info I could find suggested that 'vista' should work as the --os-variant, I haven't found any values specific to windows 7. Here's my blue screen: I've found very little by Googling, so I'm guessing this isn't a case of KVM simply not supporting Windows 7. Thanks for any help. Update: I have been able to successfully create a Windows 7 VM using the graphical "Virtual Machine Manager" app, although I don't really understand the cause of the problem with the VM created with virt-install. Comparing the configuration files under /etc/libvirt/qemu provides some clues, although I don't know enough to interpret them properly. The interesting differences in the two VM configurations are: --- win7-virt-install.xml +++ win7-vmm.xml -<domain type='qemu'> +<domain type='kvm'> @@ -21 +21 @@ - <emulator>/usr/bin/qemu-system-x86_64</emulator> + <emulator>/usr/bin/kvm</emulator> @@ -23 +23 @@ - <source file='/home/kief/VM-Images/ksm-win7.qcow2'/> + <source file='/var/lib/libvirt/images/ksm-win7x64.img'/> I'm not sure if this means the working VM is not using qemu at all, or if there is some other difference in the way it's used with kvm. Update2: So I've answered my own question (mostly) below. A KVM VM needs to use KVM's own CPU emulation rather than qemu's in order for me to get Windows 7 installed. I'm not sure whether there is something that can be done to get it working on a qemu-emulation CPU, or whether a newer version will support it. But at least it is possible to get it running on a KVM VM.

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  • Real-time log parsing and reporting

    - by Alienfluid
    We have a small project we are working on part-time that runs on Nginx/MongoDB on Ubuntu 10.04 LTS Server. We'd like to be able to see reports on things like server load, requests/sec, response time, DB load, DB response time, etc. Is there an open source or free (as in beer) tool that can parse such logs and provide a real-time report? I looked into Splunk briefly, but I wanted to see if there are any others that are highly recommended.

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  • How can I download Maven artifacts in chef?

    - by recampbell
    I want to do something like this in a chef recipe: maven_artifact "/opt/foo/my.jar" do source "com.foo:my:0.1:jar" end But I can't find a cookbook which provides this. I've written something which basically does this but it doesn't handle snapshots, which requires parsing maven-metadata.xml. Before I plunge into this, I wanted to be sure I wasn't missing something obvious since this seems like a basic usecase.

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  • Number of Splitters on Coaxial Connection and Cable Internet Quality of Service

    - by Matthew Ruston
    Does running multiple coaxial splitters on a single coaxial cable line effect quality of service for cable internet connections? Suppose there are 2-4 splitters between the cable line coming into a building before the connection to a cable modem, does this negatively effect the latency, throughput, etc of a cable internet connection by any measurable amount? Is there a maximum number of times that a coaxial cable can be split into multiple internet and TV connections before QoS suffers?

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  • What is the easiest/simplest way to change the HD on a Linux server?

    - by ArmlessJohn
    Hello. I have a machine running Ubuntu Server that has been presenting some HD-related problems. Instead of reinstalling and reconfiguring everything (and to save time) we'd like to copy everything from the current hard drive to a new one and start using it. We only have a single hard drive with a main partition and a swap partition. What tools or methods would you recommend for replacing a hard drive with minimum difficulty and chance of problems? Thank you.

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  • How to declutter and organize the cables on and under my desk?

    - by splattne
    Computer cables and external devices are a continuous source of frustration for everybody who likes a clean working environment. The more devices you add to your home office, the more disastrous the situation under the table becomes: cords falling behind the desk, ugly cables running along the sides and under of the desk, making it almost impossible to clean and remove the dust. This is not my office, but I've seen similar "setups:" I'm looking for good tips/products which help me in keeping the all cables somehow under control and organized. Thanks!

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  • Sensitive data deletion (remote)

    - by José Antonio Silva
    Hi, I'm just finished my Amazon EC2 migration and I want to delete all the files (databases, source code) from the old servers. The problem is that the servers are in California and my business is in Chile, soo I only have ssh access to that servers. I'm planning to sell the servers and I'm wondering if there is a way to perform a low levele deletion remotely of the specific files and folders. Thanks in advance! José Antonio

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  • Amazon EC2 High-Memory Extra Large Instance

    - by Simpanoz
    I am new to Mongodb and EC2. If I use following single MongoDb server : High-Memory Extra Large Instance 17.1 GiB memory, 6.5 ECU (2 virtual cores with 3.25 EC2 Compute Units each), 420 GB of local instance storage, 64-bit platform As a layman, if we quantify I/O, data in MB/sec. How much I/O transactions mongodb server can handle easily, without being burnt out. Consider default settings of EC2 server with Ubuntu and MongoDb version available in AWS marketplace. Thanks in advance

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  • Databases supporting parallel processing across multiple servers

    - by David
    I need a database engine that can utilize multiple servers for processing a single SQL query in parallel. So far I know that this is possible with the some engines, though none of them are feasible for me either because of pricing or missing features. The engines currently known to me are: MS SQL (enterprise) DB2 (enterprise) Oracle (enterprise) GridSQL Greenplum

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  • Mac OS X web server memory depletion issues

    - by Ali
    I have a Mac mini ram 4GB setup as a web server which has low traffic - it is running single WordPress instance and a forum. Why is available memory dropping to ~20MB after a while, bringing the whole server down? I see httpd processes climbing more and more, and the only thing I can do is to restart the server and everything will work fine again. Anybody with the same issues to share their thought about this?

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  • Problem switching to a VT from X

    - by Dane Midas
    Hello, I have trouble switching to a VT from X I only have VT 6 defined in inittab, however once in X, ctrl + alt + F6 does not work. I see no errors of any sort, and my keymapping is correct. How would I determine the source of, and solve this problem?

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