/ - rtt - IT Resource

  • systemd management using systemctl and journalctl to check systemd logs


    systemd is like the service manager for your Centos and other modern Linux distributions (including Debian/Mint/Ubuntu) allows you to enable services, stop them, restart them, check their status and even reboot your system. The key commands or arguments you will use with systemctl are the following: Unit Commands:   list-units [PATTERN...]         List loaded units &nbs........
  • MySQL change for Antelope format to Barracuda error solution


    Your database uses Antelope as the file format. Full UTF-8 support in MySQL and MariaDB requires the Barracuda file format. Please switch to the Barracuda file format. See the documentation MySQL full unicode support for details. In /etc/my.cnf under [mysqld]   180827 21:43:14 InnoDB: 5.5.59 started; log sequence number 1589339 180827 21:43:14 [ERROR] /usr/libexec/mysqld: unknown variable 'db_file_format=Ba........
  • PHP Displaying Blank Page on Apache


    Almost always the reason will be that the php.so file is missing but also that php.conf is misconfigured. In the problem machine it is actually PHP 7 installed so if you reference PHP 5 of course things wil be broken! Take for example here: cat /etc/httpd/conf.d/php.conf # # PHP is an HTML-embedded scripting language which attempts to make it # easy for developers to write dynamica........
  • PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib64/php/modules/geoip.so' - /usr/lib64/php/modules/geoip.so: undefined symbol: GeoIP_country_code_by_name_v6 in Unknown on line 0


    PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/lib64/php/modules/geoip.so' - /usr/lib64/php/modules/geoip.so: undefined symbol: GeoIP_country_code_by_name_v6 in Unknown on line 0 Solution: Edit geoip.ini vi /etc/php.d/geoip.ini Comment out the .so like so: ;extension=geoip.so service httpd restart........
  • [warn] VirtualHost 10.2.5.101:443 overlaps with VirtualHost 10.2.5.101:443, the first has precedence, perhaps you need a NameVirtualHost directive


    [root@thetor2017 conf]# service httpd restart Stopping httpd:                                            [  OK  ] Starting httpd: WARNING: MaxClients of 3000 exceeds ServerLimit value of 300 servers,  lowering MaxClients to 300.  To increase........
  • Centos 7 - How To Install NFS and Mount Remotely


    1.) First install nfs-utils [root@bcitcourse ~]# yum -y install nfs-utils Loaded plugins: fastestmirror base                                                         &n........
  • How to qemu-kvm enable bridged networking in Debian Ubuntu Linux Mint on KVM containers


    I've read a few guides about this but they didn't work for me. sudo apt-get install bridge-utils #don't think the above is enough it won't work still even though you have by default an /etc/qemu-ifup that handles it if you have the right tools and setup sudo qemu-system-x86_64 -net tap -net nic -enable-kvm -cpu host,vmx=on ~/VirtualBox VMs/vsphere-vcenter/vsphere-vcenter.vdi W: /etc/qemu-ifup: no bridge for guest interface foun........
  • VMWare 6.7 VCSA VSphere ESXi Management SSO Install Guide on Linux using the CLI


    #mount the VCSA DVD mount /dev/sr0 /mnt/cd #alternatively you could mount the iso directly mount -o loop vcsa.iso /your/mount/path #for this purpose we are using the CLI installer on Linux cd /mnt/cd/vcsa-cli-installer/lin64 #no it's not going to be that easy you can't just run vcsa-deploy like that you need to use a template or configured .json file ./vcsa-deploy Usage: vcsa-deploy [-h] [--version] [--supported-deploymen........
  • Howto install ioncube loader to PHP by Zend


    First of all download the raw .so file from zend: Copy the one relevant to your PHP version to  /usr/lib64/php/modules/ eg.: cp ioncube_loader_lin_5.3.so /usr/lib64/php/modules/ Then in your /etc/php.d/ directory create the file: vi /etc/php.d/zend.ini zend_extension = /usr/lib64/php/modules/ioncube_loader_lin_5.3.so After that restart apache/httpd and you'll be good to go!........
  • named [FAILED] - zone 1.168.192.in-addr.arpa/IN: not loaded due to errors. - bind error solution


    Centos when copying old files and restarting it seems load everything fine and then says [FAILED] with no log or other message. service restart named named   [FAILED] Check more thoroughly you may have missed the error if you have lots of zones!  service named restart|grep error zone 1.168.192.in-addr.arpa/IN: not loaded due to errors. zone 2.168.192.in-addr.arpa/IN: no........
  • Maximum number of connections from user+IP exceeded (mail_max_userip_connections=10) Dovecot Solution


    This happens because Dovecot limits the maximum IMAP connections per IP to just 10.  This may be fine for a single client side IP but if an entire office or multiple users are behind one IP or a single heavy user is active then you will get bizarre errors in your e-mail clients such as "Password Incorrect" or similar in Thunderbird.  It won't be obvious on the client side as to what the problem is and they will probably just think the server is misconfi........
  • Linux Mint Black Screen after boot no graphics solution


    This is not the normal "black screen" issue and I was shocked to eventually find out why.  The normal advice of reconfiguring Xorg didn't work.  Even booting into "Recovery Mode" did not help. Here is the short end of the stick that fixed it: sudo apt-get install mdm mate-desktop-environment Yes you got it right, mdm and the mate-desktop-environment / gnome were somehow uninstalled.  This must be whe........
  • named[1525]: error (broken trust chain) resolving 'min-api.cryptocompare.com/A/IN': 173.245.58.78#53 solution


    So you restarted your router/dhcpd server or for some other reason you wonder why DHCP is not working on any of your clients?  You go and check that named is in fact running fine. But then you check /var/log/messages and see this error for everything hostname: named[1525]: error (broken trust chain) resolving 'min-api.cryptocompare.com/A/IN': 173.245.58.78#53 I've only ever seen this when the time on the server was off.  It........
  • How To Set or Change Useragent in Firefox and Seamonkey


    In your browser go to "about:config" Right click and choose "New" -> "String" The name should be: general.useragent.override String Value: Mozilla/5.0 (Linux; U; Android 2.2.1; en-ca; LG-P505R Build/FRG83) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1   You don't even have to restart to make this work.........
  • Prevent SSH Bruteforce and Hacks By Disabling Password Authentication


    One simple way to keep your server public but almost impossible to hack via SSH is to disable password authentication over SSH.  This means the only way in is via  your own private key that only you should have. Edit your /etc/ssh/sshd.conf file Set this option PasswordAuthentication no Restart your SSH server. service sshd restart  ........
  • curl: (35) Unknown SSL protocol error in connection Solution Centos


    curl: (35) Unknown SSL protocol error in connection The main solution is to update curl and nss.  If you are having an issue with curl through Apache/PHP you will need to restart PHP after. It's important to remember that this error could mean a lot of things but most often it simply means that curl and openssl may be outdated and only allow newer secure ways of connecting to SSL. In general here is how you would fix it in most c........
  • MySQL Cannot Update/Write to any database table solution


    This happened on Centos for no apparent reason with no obvious issue in the logs.  Data could be read fine but not written (possibly due to some corruption or out of memory issue in the OpenVZ container is the best guess).   All mysql update and insert queries failed freezing without any error log on any database and table. Tried to restart: service mysqld restart Timeout error occurred trying to stop MySQL........
  • ERROR 2006 (HY000) at line 567: MySQL server has gone away


    mysqldump or mysql query of a larger file/table ERROR 2006 (HY000) at line 567: MySQL server has gone away Add this to /etc/my.cnf max_allowed_packet=64M service mysqld restart........
  • kdenlive - No LADSPA plugins were found! Check your LADSPA_PATH environment variable. [producer_xml] failed to load transition "qtblend"


    This happens if you are running a kdenlive script from the shell of a remote machine without using SSH "-X" forwarding and it will also cause any areas where you write text to be a white screen for that duration.   melt FusionFestival.kdenlive No LADSPA plugins were found! Check your LADSPA_PATH environment variable. [producer_xml] failed to load transition "qtblend" [producer_xml] failed to load transition &q........
  • Disable SSH Password Authentication to Increase Security and Harden SSH Linux Unix Server Ubuntu Mint Centos Debian


    Just a note before you do this you should have a sure, guaranteed way into the system such as local, KVM or preferably publickey making bruteforce SSH absolutely impossible since there is no password to bruteforce and even if someone knew the password they wouldn't be able to login except from the local console (presumably you should make sure no one unauthorized has physical access). 1. Edit /etc/ssh/sshd_config Find the section like this:........
  • [1035724.274610] [drm:intel_pipe_update_end [i915_bpo]] *ERROR* Atomic update failure on pipe A (start=62076478 end=62076479) time 102 us, min 894, max 899, scanline start 893, end 900 W: Possible missing firmware /lib/firmware/i915/kbl_dmc_ver1.bin


    [1035724.274610] [drm:intel_pipe_update_end [i915_bpo]] *ERROR* Atomic update failure on pipe A (start=62076478 end=62076479) time 102 us, min 894, max 899, scanline start 893, end 900 W: Possible missing firmware /lib/firmware/i915/kbl_dmc_ver1.bin for module i915_bpo   I've been getting those errors on a J3455 NUC box with the latest kernel on Linux Mint 18.2.  When updating the initramfs I also got the error about the firmware........
  • Debian/Mint/Ubuntu Font Packs/Recommended To Install


    This will give you a lot more nice fonts to work with.  Usually you must restart the program you are using to see the new fonts. ttf-mscorefonts-installer fonts-larabie-* ttf-xfree86-* ubuntustudio-fonts ttf-* fonts-*........
  • cudaminer freezes Linux Mint taints kernel


    When running cudaminer once it tries to initialize the card the entire screen freezes.  The computer itself is still running but the Xorg is done for, you cannot even switch to another console window and must reboot (even an mdm or Xorg restart does not help). At first cudaminer will give you these errors: stratrum_recv_line failed ...retry after 15 seconds GPU #0: Geforce 210 with compute ca........
  • Linux Mint Intel Screen Tearing Horizontal Line Solution Fix


    sudo mkdir -p /etc/X11/xorg.conf.d/ sudo vi /etc/X11/xorg.conf.d/20-intel.conf   Type "i" and enter the following: Section "Device"   Identifier      "Intel Graphics"   Driver          "intel"   Option          &........
  • Linux Mint/Ubuntu/Debian Nvidia driver becomes slow graphics performance issue


    I've had this issue since Ubuntu 9 and now even on Linux Mint 17 no matter what latest version of the Nvidia proprietary driver that I use.  It just becomes slower and slower and only gets better after rebooting or restarting Xorg. Someone here has it as well https://askubuntu.com/questions/822449/graphics-becomes-slow-after-a-while/917886 It's very fru........
  • Unable to mount location Failed to retrieve share list from server: No such file or directory solution


    Cannot even "Browse Network" when clicking on "Windows Network" Unable to mount location Failed to retrieve share list from server: No such file or directory logs: [2017/02/14 00:16:44.271314,  0] ../source3/nmbd/nmbd.c:58(terminate)   Got SIGTERM: going down... [2017/02/13 17:35:41.797944,  0] ../lib/util/become_daemon.c:124(daemon_ready) &........
  • The folder contents could not be displayed connection refused - solution


    This happened while updating Linux Mint/Debian/Ubuntu on a remote SMB/Samba share. Solution After waiting for updates to complete things will work normally but it really is strange that the service actually stops working or is disabled for so long during the update.  It is likely the update process stops the serivce and only restarts after the update is complete.........
  • ERROR 2013 (HY000): Lost connection to MySQL server during query


    The solution is simple but strange, if you copy your /var/lib/mysql directory to another server and think it will work, be sure to check if you have /var/log/mysql and binary log files.  If you do, the server will not work and will give you errors like below and crash without the proper log files. UPDATE user SET password=password("newpass") WHERE user='root'; flush privileges; ERROR 2013 (HY000): Lost connection to MySQL server durin........
  • if script bash check if socket file (mysql.sock) exists


    The "-S" switch is important as it works with sockets if you use "-f" it will not detect the socket file is there.   if [ ! -S "/var/lib/mysql/mysql.sock" ]; then  echo "Socket does not exist, restarting"  service mysqld restart fi........
  • apc_shm_attach: shmat failed: in Unknown on line 0 & apc_shm_create: shmget(0, 67108864, 914) failed PHP Solution


    PHP Fatal error:  PHP Startup: apc_shm_create: shmget(0, 67108864, 914) failed: Invalid argument. It is possible that the chosen SHM segment size is higher than the operation system allows. Linux has usually a default limit of 32MB per segment. in Unknown on line 0 PHP Fatal error:  PHP Startup: apc_shm_attach: shmat failed: in Unknown on line 0 This error is not at all fun because it actually prevents Apache/httpd from starting or working at all. It will........
  • cPanel Install Error kernel ipv6 module support solution


    2017-01-12 14:25:36  529 (ERROR): The installer was unable to verify that your kernel supports IPv6. 2017-01-12 14:25:36  530 (ERROR): The message received when trying to create an IPv6 socket was Address already in use 2017-01-12 14:25:36  531 (ERROR): Please ensure that the ipv6 module is enabled and loaded in your kernel. 2017-01-12 14:25:36  532 (FATAL): Exiting... Solution This happened........
  • bind/named rndc: connect failed: 127.0.0.1#953: connection refused (solution)


    service named status rndc: connect failed: 127.0.0.1#953: connection refused named (pid  10557) is running... Check /var/log/messages: Jan  4 17:06:22 storagebox named[10753]: none:0: open: /etc/rndc.key: permission denied Jan  4 17:06:22 storagebox named[10753]: couldn't add command channel 127.0.0.1#953: permission denied Jan  4 17:06:22 storagebox named[10753]: non........
  • OpenVZ Solution CPT ERR: c02fa000,73 :CPT: lock fd is closed incorrectly: 1 and vps-net_add ERROR: Unable to add route ip route add 192.168.5.2 dev venet0


    The only solution after trying many suggestions was to simply restart the "vz" service (definitely not preferable). Even doing an ifdown and ifup for venet0 did not help. ifup venet0 Bringing up interface venet0: Configuring interface venet0: net.ipv4.conf.venet0.send_redirects = 0 RTNETLINK answers: Network is down Some errors from log:   CPT ERR: d2dc60........
  • Linux Mint 17 How to Enable File Sharing Option in File Manager


    I still cannot understand how this would not be enabled by default and I struggled to find the reason why with manually installing samba etc.. wondering why the option for sharing was not in the menu.   On Linux Mint "MATE" the package is called "caja-share" and on Cinnamon it is called "nemo-share" so edit the below command as necessary: *Also note that the "samba" package is necessary as it is not inst........
  • HTML files in Apache still displaying as raw text even with DefaultType, ForceType etc.


    There was only one solution here and it was the following: edit /etc/httpd/conf/httpd.conf Comment the lines for the Mime Magic Module: #   MIMEMagicFile /usr/share/magic.mime #    MIMEMagicFile conf/magic   *Don't forget to restart Apache and clear your browser cache twice I was using DefaultType and ForceType a........
  • Linux Mint/Ubuntu/Debian Dual NICs networks problem when enabling and disabling one device


    The Scenario You have dual NICs and you disable NIC1 which uses 192.168.1.1 as its gateway.  With NIC2 you enable it/connect it to another network which also has the gateway 192.168.1.1 Everything will work fine at this point. When switching back to NIC1 even with NIC2 disabled and even unplugged, the OS basically can't pick up the new/updated ARP entry of the old device for 192.168.1.1 and perhaps thinks it is a security risk or spoof of some sorts and blocks i........
  • Linux Mint Network Manager Connection Disconnect Option Grayed Out


    This is a real pain because I had to manually unplug ethernet cables for network testing or to use an alternate network or guarantee physical access to one network segment is cut off.  For some reason this happened after I killed dbus because it was confused and blocking packets thinking they were coming from the wrong interface since eth0 and eth1 both had the same subnet and gateway. I eventually did a "service network-manager restart" but the option was........
  • Debian 8 Jessie in Linux OpenVZ Container does not work on Centos host


    It sounds like this is corrected in later versions of the OpenVZ kernel but I am not sure, it may also be that a much newer kernel is needed and Centos may not have a recent enough kernel. *Debain 7.0 however does work fine as a temporary fix or work around. Debian 8 OpenVZ no IP and networking not working: lo        Link encap:Local Loopback     ........
  • Installing zoneminder on Ubuntu/Debian Linux Howto


    sudo apt-get install zoneminder [sudo] password for one: Reading package lists... Done Building dependency tree       Reading state information... Done The following packages were automatically installed and are no longer required:   libuser-perl python-evince kdebase-apps kwrite unixodbc   libgnomeprint2.2-data python-soappy vgabios python-metacity hddtemp   python-mediaprof........
  • HP Procurve Switch 2824 CLI Telnet Experience , Guide and Tutorial


    telnet 192.168.1.54 ------------------------------------- ProCurve J4903A Switch 2824 Software revision I.10.77 Copyright (C) 1991-2009 Hewlett-Packard Co.  All Rights Reserved.                            RESTRICTED RIGHTS LEGEND  Use, duplication, or disclosure by the Government is subject........
  • /usr/libexec/mysqld: The table 'session' is full solution


    First of all if you're getting this error it is a result of extreme database activity.  If you aren't expecting it or it doesn't make sense to you 99% of the time this is a database driven script being exploited (some common examples I see often are things like phpBB being hit by dozens, hundreds or thousands of bots making constant DB write requests).  The easiest way to identify this is to restart MySQL and then run the third party tool "mtop" and you'll see all........
  • Postfix how to secure outgoing authenticated e-mails for privacy and hide the IP address, mailer and other things


    The most common solution is to use the /etc/postfix/header_checks but this is a big problem. Why is header_checks a problem?  Because it does it to all mail whether incoming or outgoing and whether authenticated or not.  We of course want as much header information for incoming as we can get for many reasons but many organizations want to secure and make their mail clients as secure as possible. I adapted this solution to the client's custom config, they are configur........
  • CPanel Link to all of the command line options


    <p>CPanel says you can access 98% of the functions through CLI which experienced Unix/Linux admins prefer for simplicity and for scripting.&nbsp; I've never found CPanel easy to use from the admin panel, it seems everything is hard to find and a simple task becomes a series of hunts.</p> <p>So for people like me here's the list: <a href="http://cpanel.net/system-administrators/command-line-scripts/">http://cpanel.net/system-administrators/command-line-scrip........
  • OpenVZ Unable to stop container


    vzctl stop ctid Killing container ... Child 1033348 exited with status 7 Unable to stop container vzctl enter ctid enter into CT 29831 failed Some have suggested using vzctl stop ctid --fast which does not work. The only thing that seems to work is restarting the vz service.........
  • Windows 2008 Server Trial How To Activate & Extend the Trial


    To activate your Windows 2008 server trial which gives you 180 days: Start -> Right Click (My Computer). Click "Activate Windows now" To renew your license for 6 days (can be done 3 times): Start -> Type this command: slmgr.vbs -rearm Wait a few minutes until it says it is successful (unless you get that message it has not worked or been done)........
  • Centos Howto Upgrade to PHP 5.3 from 5.2


    It's not as simple as "yum install" as you can see below and it doesn't stop there.  yum install php53 Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile  * rpmforge: mirror.us.leaseweb.net  * extras: centos.mirror.rafal.ca  * updates: centos.mirror.nexicom.net  * base: centos.mirror.nexicom.net  * addons: centos.mirror.nexicom.net Setting up Install Process........
  • /usr/local/cpanel/bin/apache_conf_distiller 100% cpu


    On some CPanel installs we see complaints of "/usr/local/cpanel/bin/apache_conf_distiller" causing 100% cpu usage without any solution. Killing the process causes it to spawn again, actually it seems it tends to spawn multiple processes itself. Restarting CPanel itself is a temporary but not permanent solution.........
  • [emerg] (28)No space left on device: Couldn't create accept lock (/etc/httpd/logs/accept.lock.15449) (5) solution


    [Wed Jan 08 18:50:07 2014] [emerg] (28)No space left on device: Couldn't create accept lock (/etc/httpd/logs/accept.lock.15449) (5) This may happen when trying to restart Apache and you find it dies right after starting and check /var/log/httpd/error_logs. What is the cause of this? You could be out of disk space (if you're not then see #2 and below) You're out of Semaphores, you need to kill all the old ones.........
  • PHP does not reload the php.ini setttings until the webserver is restarted


    Just in case anyone is wondering that is the case, it can make troubleshooting impossible if you're making changes to php.ini but don't realize the webserver must be restarted for those changes to apply (contrary to running php-cgi which always looks up the current .ini settings).........
  • [ERROR] Fatal error: Can't open and lock privilege tables: Incorrect key file for table 'user'; try to repair it - Solution


    service mysqld start MySQL Daemon failed to start. Starting mysqld:                                           [FAILED] mysqld_safe cat /var/lib/mysql/server.err 130917 17:57:09  InnoDB: Started; log sequence number 0 0 13091........
  • PHP5 Centos 6 displays part of code from PHP file for some scripts


    PHP5 Centos 6 displays part of code from PHP file for some scripts Solution edit /etc/php.ini change  short_open_tag = Off to: short_open_tag = On Then restart Apache and it should be resolved (assuming the scripts failing used <? and ?>)  ........
  • Linux free space not reclaimed after deleting large log file solution


    This example involves an Aterisk message log of about 26GB, but with any server it usually does not get deleted until the server is stopped/restarted: asterisk  13729     root    6w   REG       0,41 27277943090   59097971 (deleted) /var/log/asterisk/messages So if you've deleted a bunch of large logs, make sure you restart the server for them to regain your space.  ........
  • CPanel domain not working properly: http://vps.thedomain.com/domainnotknown.html Solution


    The Cause Basically it's usually because your Cpanel has new IPs and the old IPs it knows are no longer available/working/valid. The solution is to change the site's IP but you may run into issues for various reasons.  Here is what I encountered below. It redirects there even though public_html is empty and doesn't have any index or htaccess redirect. --- This issue happened after a CPanel migration, the site is bein........
  • OpenVZ Container Can't Restart, stuck in mounted state


    When trying to reboot this Centos 5 container, it gets stuck as "mounted" and requires a manual start command, here is what dmesg shows:   [424458.173252] VE10000: no allowed mount options found for device 0:21 [424458.177970] proc: unrecognized mount option "relatime" or missing value [424460.297663] CT: 10000: stopped [426663.466433] CT: 10000: started........
  • eth0 changed to eth1 or eth2 and the solution to fix it


    If you move your hard drive(s) around to other computers/servers, you'll find that your eth0 keeps getting higher, the first time it will become eth1 and then eth2 etc and even higher if your server has dual or quad NICs.  The reason is that udevd basically assigns eth0 tot he first NIC it finds and remembers it, if it encounters a NIC with a different MAC, it assigns it one higher (eg. eth1). See the example below, I have eth2 now so how do I fix it?........
  • How to log all PHP based E-mails for abuse


    Step #1 - Create Wrapper Script vi /usr/local/bin/phpsendmail #!/usr/bin/php <?php //changed by realtechtalk.com to make the log readable /**   This script is a sendmail wrapper for php to log calls of the php mail() function.   Author: Till Brehm, www.ispconfig.org   (Hopefully) secured by David Goodwin <david @ _palepurple_.co.uk> */........
  • Setup PXE Boot using Centos and dhcpd, tftp and syslinux


    This is something I often setup for clients because it's very helpful for people in datacenters, this allows custom OS installs on demand, you can customize it more by using kickstart etc.. but here's a base I use before customizing more: This little script below will install everything you need to get booting by PXE Linux. It also assumes you set a local IP (be sure not to overwrite your existing IP) on eth0:0 (note the :0) as 192.168.1.10 and it........
  • postfix how to send to multiple recipients default limit of 1000


    The size of the message you are trying to send exceeds a temporary size limit of the server. The message was not sent; try to reduce the message size or wait some time and try again. The server responded:  4.5.3 Error: too many recipients. We set this in main.cf: smtpd_client_recipient_rate_limit=0 We didn't specify it before and the default is said to be 0/unlimited and it still didn't change anything.........
  • Linux Ubuntu/Debian ATI 9902 No Sound Solution on HP G6 Pavilion Laptop


    00:14.2 Audio device: Advanced Micro Devices [AMD] Hudson Azalia Controller (rev 01) 00:01.1 Audio device: Advanced Micro Devices [AMD] nee ATI Device 9902 Backup your also.conf file cp /usr/share/alsa/alsa.conf /usr/share/alsa/alsa.conf.bk Change all instances of "card 0" to "card 1" (no need to manually do it, this command below does it all instantly and without fail or error:........
  • mdadm how to add a device to an array after a failure


    This array is a RAID 1 and in this case 1 of the 2 drives failed (a WD drive and I've found them to be the weakest and most unreliable of any brand and are easily damaged/DOA when shipping them). mdadm --manage /dev/md0 --add /dev/sdb1 The above assumes the array you want to add to is /dev/md0 and the device we are adding is /dev/sdb1 *One thing to remember is to make sure the partition you are adding is the correct size for the array.  You can also g........
  • Firefox 11 solution for hidden tabs to the right


    After about 15 tabs I believe, they become hidden on the right side and are accessible only by furiously clicking the "right arrow" and even then it takes forever and honestly this hidden tab feature seems to slow down everything. If you enter "about:config" in your browser without the quotes just set this value to get rid of this annoying (one of many new) feature from Firefox (set it to false and restart your browser): services.sync.prefs.sync.brows........
  • Error code: sec_error_unknown_issuer Solution Valid SSL Certificate Throwing Error in Firefox


    So you've just purchased your SSL cert, renewed it and installed it or maybe you've had it installed and working fine all the time with all other browsers but you've upgraded to a recent version of Firefox and suddenly get the warning "Error code: sec_error_unknown_issuer" error. This is terrible since if you bought an SSL cert, you are most likely using it for trust purposes for your business and obviously that message will scare away most potential customers.........
  • iptables v1.3.5: can't initialize iptables table `nat': Table does not exist (do you need to insmod?) - OpenVZ Container Problem iptables module problem solution


    iptables v1.3.5: can't initialize iptables table `nat': Table does not exist (do you need to insmod?) This solution applies to all other iptables modules/problems for OpenVZ, you'll just need to add them to both lists/lines below if you have modules other than what I have below. The modules need to be enabled in both iptables and the OpenVZ hostnode itself and then the containers which need it must be restarted. How To Enable IPTables Modules in OpenVZ........
  • Directadmin Enable SSL


    It's really silly how DA doesn't enable SSL by default but is otherwise a stable, fast and secure control panel. Here's a copy and paste way of enabling SSL for Directadmin in just a few seconds: *setup SSL openssl req -x509 -newkey rsa:1024 -keyout /usr/local/directadmin/conf/cakey.pem -out /usr/local/directadmin/conf/cacert.pem -days 9999 -nodes That creates the public certificate and private key pair in the location Directadmin expects to fi........
  • Directadmin Install Segfault Error


    ************************************* *                                   * *   All parts have been installed   * *                        ........
  • Ubuntu 10.04 Flash Videos have tearing/lines Solution


    This is what I call a ridiculous bug in compiz that causes it. The solution/To fix it just install "compizconfig-settings-manager" Open it up and Navigate to General Options -> Display Settings Set the "Refresh Rate" to the current refresh rate of your monitor. For ATI cards with slow window dragging/response supposedly disabling "Sync to VBlank" fixes that but otherwise leave it as is.........
  • iPhone Restore/Backup Location of Notes and Contact/Address Book


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    This is a very weird, annoying and bizarre quirk with many distributions, especially Debian.  The home and end keys don't work, but it's a simple fix as long as you found this article :) You just have to edit /etc/inputrc: Find the commented lines as shown below: # "e[1~": beginning-of-line # "e[4~": end-of-line *If you can't find the above, just copy and paste the code below into your inputrc, it will en........
  • Create/Enable SSL Certificates for Apache on Linux/Unix Systems eg. Redhat,Centos,Debian


    Shortcut/Easiest Way To Create A Self-Signed Key: openssl req -new -x509 -nodes -days 1530 -out server.crt -keyout server.key Using the above, you instantly create a self-signed certificate valid for 1530 days and you can simply skip to step #5.) below. If You Need a Real SSL Certificate (eg. Equifax/Openssl) then you need to create a CSR request (you'll need to follow Steps 1.) and 2.) in order to create the CSR.  You then upload the CSR Certi........
  • Windows Vista sysprep.exe /generalize error "The computer restarted unexpectedly or encountered an unexpected error. Windows installation cannot proceed. To install Windows, click "OK" to restart the computer, and then restart the installation."


    I wanted to disable the "Administrator" account for security purposes and I read some "guide" on the internet that recommended that we run "C:WindowsSystem32sysprepsysprep.exe /generalize".  I also clicked the option for "Generalize" and the computer rebooted and gave some OOBE error and restarted, and now I get the error above no matter what. I read that some drivers such as ones from AVIRA AV can cause this because they're unsign........
  • Openvz "Container already locked" Error Message Solution/Fix


    I didn't find any useful information that actually fixed this.  My VPS was in the "Running State" and I could not stop or restart it.  I kept getting "Container already locked" no matter what I did (I tried all the suggestions in the Google results for this error). Most of the suggestions were for Windows but I only use Linux.  The other solutioins also said to restart the VZ service or even the entire hostnode and this was not acceptable to me........
  • [error] server reached MaxClients setting, consider raising the MaxClients setting - Apache


    Have you ever seen this dreaded message in your Apache/HTTPD /var/log/httpd/error_log? [error] server reached MaxClients setting, consider raising the MaxClients setting The error itself is slightly misleading.  I believe this happened to one of my servers, I found Apache was running still, and that you could telnet to port 80 but no respnose would be given. For some reason my error log initially did not have the above error, but after a restart I saw........
  • MySQL Restoring And Dumping/Backing UP MySQL Data/Tables/Databases


    Backing MySQL Databases Backing Up/Dumping All Mysql Databases To A Single File mysqldump --all-databases -u admin -p > allmysqldatabases.sql The "-all-databases" clause is pretty obvious isn't it?  It means that it will backup all databases. The "-u admin" means login using the user "admin", if you h........
  • OpenVZ/Virtuozzo Enable Fuse in Container


    To enable Fuse to work inside a OpenVZ container it's very simple (although some people say it can't be done). Remember that on your HN (HostNode) for OpenVZ, Fuse must be installed and the module must be loaded for this to work.  In addition remember that you need the Fuse package installed inside the container of course. vzctl set 2000 --devices c:10:229:rw --save vzctl exec 2000 mknod /dev/fuse c 10 229 The part that most people forget........
  • SSH Server Slow/Lagged/Delayed Login Response


    This is really something the SSH Server developers should consider.  The cause of this annoyance is because of failed DNS lookups on your IP address, which is especially common for many dedicated/col-located servers and also computers on internal NAT/private networks. The chances are this is the cause of your SSH Slow/Delayed Login problems. The easy solution to SSH Login Problems Edit /etc/ssh/sshd_config Add this line to disable r........
  • SIOCSIFADDR No such device eth0 error while getting interface flags - eth0 Ethernet Device can


    I got this after copying a VMWare image onto another machine in Debian. SIOCSIFADDR No such device eth0 error while getting interface flags The solution 1.) Find and edit the device line in persisent-net.rules note it will be prefixed with something like z25 or something else. vi /etc/udev/rules.d/z25_persistent-net.rules The easiest way is to comment anything out. If you are feeling........
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  • Samba SMB Error - Server not using user level security and no password supplied. tree connect failed: NT_STATUS_WRONG_PASSWORD


    Server not using user level security and no password supplied. tree connect failed: NT_STATUS_WRONG_PASSWORD That happens when trying to use smbclient to connect to a share.  The weird thing is that I can authnenticate just fine from Windows XP. It is partially my mistake, I forgot this share does have a password.  I've tried authenticating with the correct user and also with "Guest" because this works in Windows.  In Linux I ........
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