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  • Explaining Git to someone new to revision control

    - by MaxMackie
    I've recently decided to jump into the whole world of revision control to work on some open source projects I have. I looked around (subversion, mercurial, git, etc) and found that Git seemed to make more sense conceptually to me. I've set everything up on my computer (opensuse) and made an account on gitorious (let me know if there is a more simple/better hosting provider). I understand Git from a conceptual point of view (work locally, commit to a local repo, others can now checkout from you, right?). But where does gitorious come into play? I commit to them as well as committing locally? Apart from conceptually, I don't quite understand HOW it works when it comes to making a local repository and running git init inside a folder and that HEAD file. Keep in mind I have never used any form of revision control ever before. So even the most basic concepts are foreign to me. As I post this, I'm also reading up and trying to figure it out myself.

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  • Ubuntu server loses network connection after ADSL2+ modem reset

    - by squashbuff
    I am using an ubuntu 10.04 server (running on a Lenovo Thinkpad notebook) as my webserver. It is performing well in terms of handling the traffic etc. However my internet connection is ADSL2+ (using Thomson TG782T modem-router) and if the modem is reset, then my server loses network connection. The networkmanager icon shows a red exclamation mark showing that is has no connection. But as soon as I click on it and tell it to connect to eth0, the connection is back on. It must be something that networkmanager is failing to do and because of this, the reliability of my webserver is suffering. Any advice on how this can be fixed?

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  • processes slow after some time of actively running

    - by Yervand Aghababyan
    i have several cron jobs running on an ubuntu machine. each one does some pretty heavy load stuff. The cron jobs are parsing files and the bigger the file the longer it takes them to parse it. The strange thing is that if i make the files too big ( like 30mb) the script kind of hangs. It starts processing them really enthusiastically but after some time (something like 5-10 minutes) the cpu usage of the process drops a lot and it gets into some "zombie" state. If prior to this the process in htop was using 70-80% of the CPU then after this drop occurs it slows down to something like 5-10%. the load average drops down as well. The status of the processes sometimes changes to D in htop, which AFAIR stands for zombie. Today i noticed the same behavior of processes of mysql when executing heavy queries (a query took something like 4 hours to execute). the cron jobs are mostly php and during their processing most of the CPU eats the php process and not mysql. so i think the issue is not with a specific language/program but with the way the processes are "managed". The only other place i've seen similar behavior was on my Amazon EC2 micro instance when after some aggressive use of CPU the CPU quota was taking effect and everything was slowing down dramatically. This is a dedicated machine running ubuntu. what may be the cause?

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  • zlib/libxml2 duplicate package?

    - by Fusion
    I've been updating my amazon ec2 micro instance every month till now. when i try to "yum update" i receive this error : zlib-1.2.5-7.11.amzn1.x86_64 has installed conflicts libxml2 < ('0', '2.7.7', None): libxml2-2.7.6-4.12.amzn1.x86_64 zlib-1.2.5-7.11.amzn1.x86_64 is a duplicate with zlib-1.2.3-27.9.amzn1.x86_64 yum update output: http://pastebin.com/Dfq0yphN I've tried to update separately zlib and libxml2 zlib: same "duplicate" error. libxml2: Transaction Check Error: package libxml2-2.7.8-10.24.amzn1.x86_64 is already installed what can i do?

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  • 2 Printers 1 Queue

    - by Shazburg
    My issue: When an order is processed, the same document needs to be printed on two printers. My proposed solution: Create a single queue in CUPS with a backend script that spits the job out to the two real printers queues. My problem: Documentation. Maybe I'm looking at every ring around the bullseye, but I can't find anything that lays out the rules for writing a CUPS backend script. In the end, I have several questions: Is there already an option to do this in CUPS that I've missed? The line I use to add my queue is "lpadmin -p MultiPass -E -v multipass -P Generic PostScript Printer". But DeviceURI is bad unless I specify a directory like "-v multipass:/tmp". Why is this? For testing, my script does nothing but capture ARGV and write it out to a text file one line per argument. Problem is, I'm getting nothing. Logs show the job as successful, but I'm pretty sure my meager attempt at a backend isn't even being run. I've tried to keep this question brief, so please ask for more info as I'm sure I've left out the most important part in all this. Honestly, I'm just done chasing my own tail. Thank you for your time.

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  • Cant remove/delete symlink

    - by user477519
    I have tried to create a symlink and it threw this error: ln: accessing `.test': Permission denied Now I can't unlink or delete the symlink file. Tried Googling for help but could not find a solution. Please find the results of following commands. stat .test : File: `.test'stat: cannot read symbolic link `.test': Permission denied Size: 26 Blocks: 0 IO Block: 16384 symbolic link Device: 1fh/31d Inode: 312075453 Links: 1 Access: (0777/lrwxrwxrwx) Uid: (11160/ chatt) Gid: (11307/ pgr) Access: 2012-11-12 11:36:51.167327500 +0000 Modify: 2012-11-12 11:36:51.163331700 +0000 Change: 2012-11-12 11:36:51.163331700 +0000 Birth: - chattr -i .test: chattr: Permission denied while trying to stat .test lsatter .test lsattr: Operation not supported While reading flags on .test Any help would be appreciated. Thanks

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  • Does a VPS need a firewall?

    - by Camran
    Do I need a firewall on my VPS which I ordered today? If so, which one would you recommend? I plan on running a classifieds website with Java, php, mysql. My OS is ubuntu 9.10 Thanks Btw: What is iptables?

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  • Fedora Core 11 won't boot without a monitor

    - by feihtthief
    I have a P4 system that I installed Fedora 11 on. It will not boot without a monitor attached. The monitor can be off (not even have power plugged in), but must be attached. Without a monitor the hard disk thrashes around a bit like it's starting up services, but does not get to the point where I can ssh into the box. I have set the default runlevel to 3 and removed the rhgb entry from grub. Any suggestions welcome. Edit: I have already set the run-level to 3. The machine boots up fine with the monitor plugged in to the point where I can SSH into it. as soon as i unplug the monitor and reboot, it will not boot to that point.

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  • Does anyone know why rsync would keep sending the files over and over again?

    - by beagleguy
    I'm trying to using rsync to backup some files, about half a TB. It's now it a state where it keeps sending the same files everytime it runs. for example: rsync -av /data/source/* user@host:/data/dest sending incremental file list source/file1.txt source/file2.txt I then verify those files are copied over... then the next time it runs it does the same thing rsync -av /data/source/* user@host:/data/dest sending incremental file list source/file1.txt source/file2.txt any idea why it's getting stuck on these files? I've tried to wipe the whole dest directory out and start over but no luck. thanks,

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  • Wi-Fi Stick with ZD1211 chip refuses to work on Ubuntu >8.10. No clue.

    - by Benjamin Maus
    I have a machine running Ubuntu 9.10 (Karmic *x86_64*). Everything is running smooth so far, except for the Wi-Fi USB Stick. The same device worked perfectly in 8.10. The wireless device is a GW-US54GXS using the Zydas Zd1211 chipset. Dmesg output after plugging in: [ 196.303436] phy0: Selected rate control algorithm 'minstrel' [ 196.304209] zd1211rw 2-1:1.0: phy0 [ 196.304227] usbcore: registered new interface driver zd1211rw [ 196.334137] usb 2-1: firmware: requesting zd1211/zd1211b_ub [ 196.357463] usb 2-1: firmware: requesting zd1211/zd1211b_uphr [ 196.402643] zd1211rw 2-1:1.0: firmware version 4725 [ 196.442611] zd1211rw 2-1:1.0: zd1211b chip 2019:5303 v4810 high 00-90-cc AL2230_RF pa0 ---N- [ 196.463814] usb 2-1: firmware: requesting zd1211/zd1211b_ub [ 196.466823] usb 2-1: firmware: requesting zd1211/zd1211b_uphr Syslog output: Nov 5 11:20:24 somesystem kernel: [ 196.303436] phy0: Selected rate control algorithm 'minstrel' Nov 5 11:20:24 kierkegaard NetworkManager: <info> Found radio killswitch rfkill0 (at /sys/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1:1.0/ieee80211/phy0/rfkill0) (driver <unknown>) Nov 5 11:20:24 somesystem kernel: [ 196.304209] zd1211rw 2-1:1.0: phy0 Nov 5 11:20:24 somesystem kernel: [ 196.304227] usbcore: registered new interface driver zd1211rw Nov 5 11:20:24 somesystem NetworkManager: SCPlugin-Ifupdown: devices added (path: /sys/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1:1.0/net/wmaster0, iface: wmaster0) Nov 5 11:20:24 somesystem NetworkManager: SCPlugin-Ifupdown: device added (path: /sys/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1:1.0/net/wmaster0, iface: wmaster0): no ifupdown configuration found. Nov 5 11:20:24 somesystem NetworkManager: SCPlugin-Ifupdown: devices added (path: /sys/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1:1.0/net/wlan0, iface: wlan0) Nov 5 11:20:24 somesystem NetworkManager: SCPlugin-Ifupdown: device added (path: /sys/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1:1.0/net/wlan0, iface: wlan0): no ifupdown configuration found. Nov 5 11:20:24 somesystem NetworkManager: <info> (wlan0): driver supports SSID scans (scan_capa 0x01). Nov 5 11:20:24 somesystem NetworkManager: <info> (wlan0): new 802.11 WiFi device (driver: 'zd1211rw') Nov 5 11:20:24 somesystem NetworkManager: <info> (wlan0): exported as /org/freedesktop/NetworkManager/Devices/2 Nov 5 11:20:24 somesystem NetworkManager: <info> (wlan0): now managed Nov 5 11:20:24 somesystem NetworkManager: <info> (wlan0): device state change: 1 -> 2 (reason 2) Nov 5 11:20:24 somesystem NetworkManager: <info> (wlan0): bringing up device. Nov 5 11:20:24 somesystem kernel: [ 196.334137] usb 2-1: firmware: requesting zd1211/zd1211b_ub Nov 5 11:20:24 somesystem kernel: [ 196.357463] usb 2-1: firmware: requesting zd1211/zd1211b_uphr Nov 5 11:20:24 somesystem kernel: [ 196.402643] zd1211rw 2-1:1.0: firmware version 4725 Nov 5 11:20:24 somesystem kernel: [ 196.442611] zd1211rw 2-1:1.0: zd1211b chip 2019:5303 v4810 high 00-90-cc AL2230_RF pa0 ---N- Nov 5 11:20:24 somesystem NetworkManager: <WARN> nm_device_hw_bring_up(): (wlan0): device not up after timeout! Nov 5 11:20:24 somesystem NetworkManager: <info> (wlan0): deactivating device (reason: 2). Nov 5 11:20:24 somesystem kernel: [ 196.463814] usb 2-1: firmware: requesting zd1211/zd1211b_ub Nov 5 11:20:24 somesystem kernel: [ 196.466823] usb 2-1: firmware: requesting zd1211/zd1211b_uphr Nov 5 11:20:29 somesystem wpa_supplicant[978]: Could not set interface 'wlan0' UP Nov 5 11:20:29 somesystem wpa_supplicant[978]: Failed to initialize driver interface Nov 5 11:20:29 somesystem NetworkManager: <WARN> nm_supplicant_interface_add_cb(): Unexpected supplicant error getting interface: wpa_supplicant couldn't grab this interface. Gnome tells me in the network menu that the device was "not ready". It appears in iwconfig but not in ifconfig. The same symptoms appear when I boot from the live CD. How can I solve this dilemma?

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  • IPtables Traffic Quota - up and down

    - by Nick
    I've been trying to set up traffic quotas for users on a shared server and i believe [with my limited knowledge] that iptables --quota and ports which have been selected for each user [--dport] is the way to do this... iptables -A OUTPUT --dport 1,2,3,4... --quota 123412341234 -j ACCEPT iptables -A OUTPUT --dport 1,2,3,4... -j DROP I think something like this would work to limit the traffic [and reset every month] but its only for traffic going out. Is there something I could do to combine -A OUTPUT and -A INPUT into one quota? Or, is there a different method I could use to achieve the same thing more efficiently? OS is debian squeeze Thanks.

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  • How can I change the default domain in an OTRS installation?

    - by Jamie
    I used a turnkeylinux.org otrs installation and I'm trying to configure the default domain of 'yourhost.example.com'. I tried the following: sed -ri 's/yourhost.example.com/mydomain.com/' /usr/share/otrs/Kernel/Config/Defaults.pm sudo shutdown -r now The next time I logged and tried to create a user, the default domain was still there. How can I change default doamin in an OTRS installation?

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  • Production Instance : CLOSE_WAIT Connection Issue

    - by rajnikant
    I am using 10EC2 Instances behind 1 ELB. And ELB configured 80 to 8080 and 443 to 8080 port. And all 10EC2 instances having installed with Apache Tomcat, total request on ELB around 8000 to 10000 in 1 minute. I am facing problem for CLOSE_WAIT connection on 10 EC2 Instance, having Apache Tomcat. EC2 Instance Type : m1.xlarge When we restart the Apache Tomcat, all CLOSE_WAIT connections are lost, but its not proper way to work on Production Instances. Please help me out.

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  • where are deleted files kept?

    - by ant2009
    Hello, Ubuntu 9.10 I recently deleted some files. I would like to know are the files kept in a directory? Like in windows recycle bin. I would like to know where these files are? Many thanks for any suggestions,

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  • Will these instructions work when turning of journaling on an ext4 SSD?

    - by snowlord
    I have an Acer Aspire One with an SSD for storage. I recently installed Ubuntu on it and chose ext4 for my filesystem. Then I read that journaling on an SSD isn't the best idea, so I will try to disable journaling and I have found these intstructions (from http://fenidik.blogspot.com/2010/03/ext4-disable-journal.html): # Create ext4 fs on /dev/sda10 disk mkfs.ext4 /dev/sda10 # Enable writeback mode. This mode will typically provide the best ext4 performance. tune2fs -o journal_data_writeback /dev/sda10 # Delete has_journal option tune2fs -O ^has_journal /dev/sda10 # Required fsck e2fsck -f /dev/sda10 # Check fs options dumpe2fs /dev/sda10 |more For more performance add fstab opions: data=writeback,noatime,nodiratime i.e: /dev/sda10 /opt ext4 defaults,data=writeback,noatime,nodiratime 0 0 I will use them on my boot partition. Are there any particularly bad parts here, or are there any missing steps? Will my boot partition be fit for being on an SSD after this? Or should I consider switching to ext2, or even reinstall it all and choose ext2 at partitioning time (I'd rather not though, since I've configured quite some stuff already)?

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  • Effects of internet connection speeds on server queries

    - by SephMerah
    Can my internet connection significantly effect queries run on phpmyadmin? I am currently 18 down and 30 up. I switched internet connections today and noticed a deep drop in query performance. The query that I am running is SELECT * FROM table. Simple. The table has one row of data. The MySQL server is on the same server as everything else. It is a VPS. Godaddy hosts. I dont have any other information. Centos 6.3 MySQL 5.1 PhpMyAdmin 3.4 Okay used google tools to inspect the XHR going out and coming in and this is what it reported. {"success":true,"message":"<div class=\"success\">Your SQL query has been executed successfully ( Query took 0.0033 sec )<\/div>","sql_query":"<div id=\"result_query\" align=\"\">\n<div class=\"success\">Your SQL query has been executed successfully ( Query took 0.0033 sec ) SNIP..................."}. So apparently my server is fine. The strange thing is though.. The returned XHR comes back exactly as soon as I execute the query on the page. It comes back within less than a second. Why PhpMyadmin does not report the change immediately. I am going to try a re-install.

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  • SSH issues: Read from socket failed: Connection reset by peer

    - by nitins
    I compiled OpenSSH_6.6p1 on one of our server. I am able login via SSH to the upgraded server. But I am not able to connect to other servers running OpenSSH_6.6p1 or OpenSSH_5.8 from this. While connecting I am getting an error as below. Read from socket failed: Connection reset by peer On the destination server in the logs, I am seeing it as below. sshd: fatal: Read from socket failed: Connection reset by peer [preauth] I tried specifying the cipher_spec [ ssh -c aes128-ctr destination-server ] as mentioned in here and was able to connect. How can configure ssh to use the cipher by default? Why is the cipher required here?

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  • How to change resolution in Ubuntu 10.04, where xvinfo is showing no adapters present?

    - by YumYum
    I am trying to maximize my resolution where I have Resolution: 800x600 (4:3) and Refresh rate: 61Hz I tried the following, but it did not work: $ xvinfo X-Video Extension version 2.2 screen #0 no adaptors present $ cvt 1920 1080 # 1920x1080 59.96 Hz (CVT 2.07M9) hsync: 67.16 kHz; pclk: 173.00 MHz Modeline "1920x1080_60.00" 173.00 1920 2048 2248 2576 1080 1083 1088 1120 -hsync +vsync $ xrandr --newmode clever_name 173.00 1920 2048 2248 2576 1080 1083 1088 1120 $ xrandr -q Screen 0: minimum 640 x 480, current 800 x 600, maximum 800 x 600 default connected 800x600+0+0 0mm x 0mm 800x600 61.0* 640x480 60.0 clever_name (0x11d) 173.0MHz h: width 1920 start 2048 end 2248 total 2576 skew 0 clock 67.2KHz v: height 1080 start 1083 end 1088 total 1120 clock 60.0Hz $ xrandr --addmode default clever_name $ xrandr --output default --mode clever_name xrandr: Configure crtc 0 failed

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  • How do I Forward root's email to an external email address?

    - by ErebusBat
    I have a small server (Ubuntu 10.04) at my house and I would like to forward root's email to my gmail hosted domain to get security notifications and what not. I ripped everything out and started from scratch and ran into some other issues. I now have sendmail working in the sense that I can mail [email protected] and get the mail. HOWEVER, adding an address to /root/.forward does not actually forward the message. I get the following in my logs: Dec 22 14:04:37 batcave sendmail[4695]: oBML4bAT004695: to=<root@batcave>, ctladdr=aburns (1000/1000), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30075, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (oBML4bJ9004696 Message accepted for delivery) Dec 22 14:04:39 batcave sm-mta[4698]: STARTTLS=client, relay=[69.145.248.18], version=TLSv1/SSLv3, verify=FAIL, cipher=DES-CBC3-SHA, bits=168/168 Dec 22 14:04:40 batcave sm-mta[4698]: oBML4bJ9004696: to=<[email protected]>, ctladdr=<[email protected]> (1000/1000), delay=00:00:03, xdelay=00:00:03, mailer=relay, pri=120336, relay=[69.145.248.18] [69.145.248.18], dsn=2.0.0, stat=Sent (OK 01/D4-00853-216621D4) You can see where my local sendmail instance accepts it then hands it off to my ISP, but with the wrong address ([email protected]).

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  • The best way to hide data Encryption,Connection,Hardware

    - by Tico Raaphorst
    So to say, if i have a VPS which i own now, and i wanted to make the most secure and stable system that i can make. How would i do that? Just to try: I installed debian 7 with LVM Encryption via installation: You get the 2 partitions a /boot and a encrypted partition. When booting you will be prompted to fill in the password to unlock the encryption of the encrypted partition, Which then will have more partitions like /home /usr and swapspace which will automatically mount. Now, i do need to fill in the password over a VNC-SSL connection via the control panel website of the VPS hoster, so they can see my disk encryption password if they wanted to, they have the option if they wanted to look at what i have as data right? Data encryption on VPS , Is it possible to have a 100% secure virtual private server? So lets say i have my server and it is sitting well locked next to me, with the following examples covered bios (you have to replace bios) raid (you have to unlock raid-config) disk (you have to unlock disk encryption) filelike-zip-tar (files are stored in encrypted archives) which are in some other crypted file mounted as partition (archives mounted as partitions) all on the same system So it will be slow but it would be extremely difficult to crack the encryption. So to say if you stole the server. Then i only need to make the connection like ssh safer with single use passwords, block all incoming and outgoing connections but give one "exception" for myself. And maybe one for if i somehow lose my identity for the "exeption" What other overkill but realistic security options are available, i have heard about SElinux?

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