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• Production deployment to EC2 with minimal downtime

  - by jensendarren

  I have a simple web application deployed on a large instance with EC2. I now want to deploy the latest code to this server but I want to do this in a way which minimizes downtime and is a smooth as possible for the end user. Here is my plan: Fire up another large instance Install all the software layers on that instance Restore and attach an EBS drive to the instance Deploy our latest production ready code on the new instance Run all tests (including manual testing of the application) (If tests pass) Put a "Site Under Maintenance" notice on the live site. Backup the EBS instance on the live site Detach the EBS instance from the new server and replace with the latest backup Use ec2-associate-address to move the IP address to the new instance Sit back and wait for traffic to start flowing though the new instance Terminate the old instance Does this seem like a good strategy? Are there any tutorials or books that might cover this topic? I have already read Cloud Application Architectures by George Reese, which is an excellent book, but does not cover deployment. Additionally, I know that there are tools that can help with this like RightScale or enStratus which I will use when I start using more than one instance.

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• ubuntu to ubuntu backup in internal network

  - by amirash

  hey, i got my development "home" server witch is ubuntu 10, i brought today a computer in order to make a backup to this computer (the development server does also to him self backups every day but im paranoaid so i want to have two backups just in case on diffrent computers) what is the best way to backup the system core of the development server (like norton ghost) & do a full & incrmnt backup of him to the new computer that ive brought? rsync? rdiff? scp? clonezilla?

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• What would cause Memcached to Hang for 2+ seconds?

  - by Brad Dwyer

  I'm going nuts trying to scale memcached. From their site: Memcached operations are almost all O(1). Connecting to it and issuing a get or stat command should never lag. If connecting lags, you may be hitting the max connections limit. See ServerMaint for details on stats to monitor. If issuing commands lags, you can have a number of tuning problems. Most common are hardware problems, not enough RAM (swapping), network problems (bandwidth, dropped packets, half-duplex connections). On rare occasion OS bugs or memcached bugs can contribute. Well.. it is most certainly not performing like an O(1) operation for me. Under low to normal load on our site memcached response times for get and set ops are about 0.001 seconds. Not bad. But if we triple the load we get outliers that take 100x (or in rare cases 1000x!) that long. I even had one instance where it took 2.2442 seconds for memcached to store a value. Obviously this is killing our site. Here's the output of Memcached-getStats during one of the slow periods: [pid] => 18079 [uptime] => 8903 [threads] => 4 [time] => 1332795759 [pointer_size] => 32 [rusage_user_seconds] => 26 [rusage_user_microseconds] => 503872 [rusage_system_seconds] => 125 [rusage_system_microseconds] => 477008 [curr_items] => 42099 [total_items] => 422500 [limit_maxbytes] => 943718400 [curr_connections] => 84 [total_connections] => 4946 [connection_structures] => 178 [bytes] => 7259957 [cmd_get] => 1679091 [cmd_set] => 351809 [get_hits] => 1662048 [get_misses] => 17043 [evictions] => 0 [bytes_read] => 109388476 [bytes_written] => 3187646458 [version] => 1.4.13 So things that I have ruled out so far are: Hitting the max connections limit (curr_connections of 84 is well below the default of max of 1024) Swapping - the machine has 900M out of 1024M of memory dedicated to memcached on a dedicated machine. It only appears to be using about 7MB of data as per the bytes stat. How would I diagnose the other hardware problems? prstat doesn't really show a whole lot going on in terms of CPU or memory usage. Not sure how to figure out the network problems but as this is a dedicated server on the same private network as the web box I don't think it's a connectivity issue (ping is less than a millisecond between the boxes). Is there something else I'm missing here? It's driving me nuts. Edit: Also forgot to mention that I've tried both persistent and non-persistent connections with minimal-to-no impact.

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• auspex LFS backups

  - by user1250465

  I have some backup tapes which existed on an AUSPEX file server. The backups were written to tape with the SunOs version of the CPIO command. Now that I need to restore them, (of course there are no more auspex servers in existance), the backups won't restore because the headers are not standard. I have dumped the tape images to disk. PAX, CPIO, and TAR cannot read the images. I've tried all of the CPIO format options. The errors I get are "name too long", "byte swapped in header", or just junk output. I can open up the images and read the contents of the files, but cannot restore the images. I have found that SunOs had a special header in CPIO V2.5 images. I have found the source for cpio, now I need definition of the SunOs header inside CPIO?

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• What laptop for dev with VS

  - by Gareth

  Im looking to spend upto £500 on a laptop in the next few days, and am now after a bit of adivce. This laptop will be used to develop personal projects on using VS2010, and SQL sever express. I know this sort of question has been asked plenty before however Im looking for specifics, has anyone bought a laptop recently to run VS on and if so what did you get? has anyone seen any good deals on laptops that fit in my price range? Any suggestions apprieciated Thanks

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• mac, when adding environmental variables using 'export ABC=/var/blah/ where is this stored?

  - by sososo

  when adding env varialbes like: export JAVA_HOME=/usr/java/skd/bin where is this stored if I want to edit it later? is it a file somewhere?

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• How do I reset the $PATH variable on Mac OS X?

  - by Neil

  I've messed up my path variable, and now some apps that I run raise errors saying Command Not Found (error 127) for commands like 'date' and 'sleep'. These commands work fine when executed directly in the shell. I'm guessing this has something to do with a malformed $PATH variable, and need to know how to reset it. I've deleted the files ~/.bashrc , ~/.bash_profile, /etc/bash.bashrc, and ~/.bashrc and ~/.profile. What other files could hold my $PATH? Is there some simpler way to reset the Path than dig into the myriad files which could hold my path? Note, this path problem is only with my user. I made a test user on my system, and the path was fine, back to normal.

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• Hadoop is not able to find JAVA_HOME properly

  - by Shekhar

  I am trying to run hadoop my Ubuntu OS. I have set JAVA_HOME variable in ~/.bashrc file to /usr/lib/jvm/jdk1.7.0_01/ but when I run hadoop namenode -format command it fails with following errors : shekhar@ubuntu:/usr$ hadoop namenode -format Warning: $HADOOP_HOME is deprecated. /host/Shekhar/Softwares/hadoop-1.0.0/bin/hadoop: line 321: /usr/jdk1.7.0_01/bin/java: No such file or directory /host/Shekhar/Softwares/hadoop-1.0.0/bin/hadoop: line 387: /usr/jdk1.7.0_01/bin/java: No such file or directory hadoop tries to locate java command at /usr/jdk1.7.0_01/bin/ path. Clearly somehow it missed /lib/jvm folder. I am not able to understand why and how this is happening. my echo $PATH command gives following output : shekhar@ubuntu:/usr$ echo $PATH /usr/lib/jvm/jdk1.7.0_01/bin:/usr/lib/lightdm/lightdm:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/lib/jvm/jdk1.7.0_01/bin:/host/Shekhar/Softwares/hadoop-1.0.0/bin If I run which java command I get following output : shekhar@ubuntu:/usr$ which java /usr/lib/jvm/jdk1.7.0_01/bin/java and echo $JAVA_HOME returns following output : shekhar@ubuntu:/usr$ echo $JAVA_HOME /usr/lib/jvm/jdk1.7.0_01 I would like to know why hadoop is taking JAVA_HOME path incorrectly. Please help...

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• Deploy our own software using Puppet?

  - by Ken

  (Apologies in advance for the stupidity in this question. I'm normally a programmer, not a sysadmin, but I've taken it upon myself to automate some things, and clean up some other things which are automated but not in the prettiest way. :-) I've been looking around at various tools for automation of software deployment to a bunch of servers, like cfengine, Puppet, and Chef. So far, Puppet looks the most appealing, but I've certainly not committed to anything yet. These tools all look like they can do a great job of keeping a bunch of servers up-to-date with prepackaged software. What I don't get is: how does one use a tool (like Puppet) to manage deployments of our own internal software? I think I'm at a loss because I've seen a thousand tutorials showing how to keep Apache ensure => latest (which is pretty cool), but nothing that quite corresponds to my use-case today, which is something more like: when a human being pushes The Button, pull branch A from the version-control repository B run command C to compile it copy the binaries D to servers E1 through E10 on each server, run command F to make all changes take effect Puppet sounds great, and I totally see the advantage of declarative, idempotent configuration over some shell scripts, but I've not seen any tutorials for "you want to update your shell scripts to Puppet (or Chef, or cfengine) so here's what you should do". Is there such a thing? Is it obvious to other people how to take the things provided in the Puppet docs and replicate the behavior I want? Am I just not getting it? What it's sounding like to me, so far, is that the human being (#1) would manually package the software (#2 and #3) external to Puppet, manually update the Puppet config, which would trigger Puppet to update the servers ... maybe? (I'm a little confused here, as I'm sure you can tell.) Thanks!

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• Why do I have three My Documents folders?

  - by root45

  I'm trying to fix my profile on Windows 7. Currently %USERPROFILE% points to C:\Users\myUsername My Documents is also at C:\Users\myUsername \\profileServer\profiles$\myUsername has TWO "My Documents" folders Neither of these folders contain what's in C:\Users\myUsername\My Documents Navigating to %USERPROFILE% in Windows Explorer displays two copies of everything, one local and one copy from the server. Programs use sort of a toss up between C:\Users\myUsername\My Documents or one of the two My Documents on profileServer. According to our sysadmins, My Documents is supposed to point to the profile server, but other folders should be local. How can I fix this so I have ONE copy of everything, with My Documents pointing to \\profileServer\profiles$\myUsername\Documents and everything else local? To be honest, I don't understand why this is so difficult and confusing. For example, why does Windows allow displaying two folders with the same name in the same directory? And why does inputting C:\Users\myUsername and %USERPROFILE% into Windows Explorer produce two different results? They should be identical. Some screenshots My directory on the profileServer My local user directory, C:\Users\myUsername Navigating to %USERPROFILE% in Windows Explorer Showing that %USERPROFILE% is set to a local directory

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• Is it possible to temporarily disable non-global zones?

  - by Gary

  I frequently need to install a package on the global zone for a quick test on a development box. When there are multiple prompts for one package I have to answer them for each zone. If the zone is not running then I need to wait for the zone to start up, answer the prompts, etc. This is particularly annoying when if I'm getting packages from http://www.sunfreeware.com and using the pkg-get utility which nicely pulls in dependencies for you. Can I disable the zones temporarily? I haven't found a way to do this. Thanks.

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• Looking for Team Development type Software like SVN

  - by SoLoGHoST

  I am in need of a software that is PHP-Based, or similar that can be installed on my server that doesn't offer SVN Perks. It should be somewhat similar to an SVN, however, since the server doesn't support SVN, we'll need another means of doing sort of the same thing. We have a team of Developers and need to accomplish progress in the same way that an SVN does, but without that type of server support. Is there any software that could be installed via webhosting that would be somewhat, if not exactly, similar to an SVN? Please help, Thanks :)

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• SamFS performance problem on file creation

  - by Gregor Longariva

  I have two samfs filesystems (samfs1 and samfs2), both on the same 6130, both with the same config/watermarks/timeouts etc. creating a file on samfs2 works as it should, on samfs1 not. A little simple script shows up, that every while and then the file creation needs between 11 and 28 seconds: stan 12:32 [scratch]# while ( 1 ) while? echo - while? time echo test file while? time mv file file2 while? echo + while? sleep 1 while? end 0.00u 0.00s 0:00.01 0.0% 0.00u 0.00s 0:00.00 0.0% + 0.00u 0.00s 0:00.00 0.0% 0.00u 0.00s 0:00.03 0.0% + 0.00u 0.00s 0:23.71 0.0% 0.00u 0.00s 0:00.14 0.0% + 0.00u 0.00s 0:00.18 0.0% 0.00u 0.00s 0:00.13 0.0% + 0.00u 0.00s 0:00.00 0.0% 0.00u 0.00s 0:00.05 0.0% + 0.00u 0.00s 0:00.00 0.0% 0.00u 0.00s 0:00.06 0.0% + 0.00u 0.00s 0:00.00 0.0% 0.00u 0.00s 0:00.05 0.0% + 0.00u 0.00s 0:00.00 0.0% 0.00u 0.00s 0:00.05 0.0% + 0.00u 0.00s 0:00.00 0.0% 0.00u 0.00s 0:00.05 0.0% + 0.00u 0.00s 0:00.00 0.0% 0.00u 0.00s 0:00.04 0.0% + 0.00u 0.00s 0:00.04 0.0% 0.00u 0.00s 0:00.05 0.0% + 0.00u 0.00s 0:00.00 0.0% 0.00u 0.00s 0:00.01 0.0% + 0.00u 0.00s 0:26.05 0.0% 0.00u 0.00s 0:00.50 0.0% + 0.00u 0.00s 0:00.00 0.0% 0.00u 0.00s 0:00.06 0.0% + 0.00u 0.00s 0:00.00 0.0% 0.00u 0.00s 0:00.12 0.0% + Any idea where the problem could be?

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• When does `cron.daily` run?

  - by warren

  When do entries in cron.daily (and .weekly and .hourly) run, and is it configurable? I haven't found a definitive answer to this, and am hoping there is one. I'm running RHEL5 and CentOS 4, but for other distros/platforms would be great, too.

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• Trigger ZFS dedup one-off scan/rededup

  - by Jake Wharton

  I have a ZFS filesystems which has been running for some time and I recently had the opportunity to upgrade it (finally!) to the latest ZFS version. Our data doesn't scream dedup but I firmly believe based on small tests that we could gain anywhere from 5-10% of our space back for free by utilizing it. I have enabled dedup on the filesystem and new files are slowly being dedupified but the majority (95%+) of our data already exists on the filesystem. Short of moving the data off-pool and then recopying it back, is there any way to trigger a dedup scan of existing data? It doesn't have to be asynchronous or live. (And FYI there isn't enough room on the pool to copy the entire filesystem to another and then just switch the mounts.)

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• How do I force a specific MTU for only certain TCP ports?

  - by Dave S.

  Background I have a set of embedded hardware deployed in the field. These remote machines connect back to my servers at AWS running Ubuntu and I use the iptables mangle chain to lower the MTU to 500 so these devices are happy. For reference, this is the iptables rule I am using: -A POSTROUTING -p tcp --sport 12345 --tcp-flags SYN,RST SYN -o eth0 -j TCPMSS --set-mss 500 Current Problem I'm trying to spin up some servers on the Joyent Cloud using SmartOS, but I can't find any information on selectively changing the MTU like I can on Linux (e.g. all info I've found is on changing it globally, which is not what I want). How would I do it so that all connections on TCP port 12345 get the MTU I want?

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• Idiomatic way to read .env variables in Ansible?

  - by Arms

  I'm provisioning a Vagrant box with Ansible, and using Benno Joy's MySQL role to setup MySQL (including creating a database and users.) The database name and credentials are stored in a .env file in the project's root. What would be the idiomatic way to use these variables when provisioning MySQL? Should I write a custom script that generates a YAML file from my .env, and then use the include_vars module? Or is there a simpler way?

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• Is there some trick to replace rebooting in windows?

  - by vps

  I've added the directory of php.exe to PATH variable,and it's available for administrator,but it's not available for user daemon. But it's available after rebooting,why is rebooting necessary?Is there some trick to replace rebooting?

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• Equivalent of PHP setlocale in an APACHE config file

  - by Nicolas

  I need to display a date in french locale. A solution is to use setlocale(LC_TIME, 'fr_FR'); But I'm looking to set the locale directly in the configuration of my apache server. In the /etc/httpd/conf/httpd.conf file, I tried <VirtualHost *:80> ... SetEnv LC_TIME 'fr_FR' </VirtualHost> without any effect. In which php or apache configuration file should I define the LC_TIME variable?

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• can I consolidate a multi-disk zfs zpool to a single (larger) disk?

  - by rmeden

  I have this zpool: bash-3.2# zpool status dpool pool: dpool state: ONLINE scan: none requested config: NAME STATE READ WRITE CKSUM dpool ONLINE 0 0 0 c3t600601604F021A009E1F867A3E24E211d0 ONLINE 0 0 0 c3t600601604F021A00141D843A3F24E211d0 ONLINE 0 0 0 I would like to replace both of these disks with a single (larger disk). Can it be done? zpool attach allows me to replace one physical disk, but it won't allow me to replace both at once.

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• ZFS recordsize for VirtualBox and other virtual disks

  - by JOTN

  Has anyone run across any good benchmarks or other research on tuning the ZFS recordsize when putting virtual disk files on it for a guest OS? I'm using VirtualBox at the moment. I have notice significant performance improvement when working with a DBMS by setting the ZFS recordsize to the same as the DB blocksize, so I'm guessing matching the blocksize of the guest filesystem would also be a good idea.

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• ubuntu to ubuntu backup in internal network

  - by amirash

  hey, i got my development "home" server witch is ubuntu 10, i brought today a computer in order to make a backup to this computer (the development server does also to him self backups every day but im paranoaid so i want to have two backups just in case on diffrent computers) what is the best way to backup the system core of the development server (like norton ghost) & do a full & incrmnt backup of him to the new computer that ive brought? rsync? rdiff? scp? clonezilla?

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• %sessionname% returns incorrect session name

  - by Samuel Walker

  I have a virtualised Windows XP SP3 machine, which I am connecting to over Remote Desktop. One of my scripts needs to use the %sessionname% variable. However this returns incorrect information. C:\>%sessionname% constantly returns RDP-Tcp#5, instead of the value for the currently connected session (RDP-Tcp#35 or similar), as shown in Task Manager This causes my scripts to contain incorrect information. What can I do to resolve this? Edit Further Information: A restart appears to solve the problem for the first connection, but then subsequent connections have the numbers fall out of sync again.

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• Path Environmental Variable errors

  - by roymustang86

  So, I am trying to learn java. I installed the JDK and proceeded to write a few programs. Each time, I have to give the path to javac.exe to compile the .java file. SO, I decided to tweak the %PATH% variable. And no matter what I change it to, it doesn't work. when I do an echo %PATH%, I get 'Program' is not recognized as an internal or external command, operable program or batch file. This is my Path variable contents : C:\app\product\11.1.0\client_1\bin;%CommonProgramFiles%\Microsoft Shared\Windows Live;%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem;%SYSTEMROOT%\System32\WindowsPowerShell\v1.0\;"C:\Program Files (x86)\Common Files\Roxio Shared\DLLShared\";"C:\Program Files\Broadcom\Broadcom 802.11";"C:\Program Files (x86)\Common Files\Roxio Shared\OEM\DLLShared\";"C:\Program Files (x86)\Common Files\Roxio Shared\OEM\DLLShared\";"C:\Program Files (x86)\Common Files\Roxio Shared\OEM\12.0\DLLShared\";"C:\Program Files (x86)\Roxio\OEM\AudioCore\";"C:\Program Files (x86)\Intel\Services\IPT\" How do I work around this? the double quotes were not there before, I added it thinking the space was the problem.

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• SSH Keys Authentication keeps asking for password

  - by Rhyuk

  Im trying to set access from ServerA(SunOS) to ServerB(Some custom Linux with Keyboard Interactive login) with SSH Keys. As a proof of concept I was able to do it between 2 virtual machines. Now in my real life scenario it isnt working. I created the keys in ServerA, copied them to ServerB, chmod'd .ssh folders to 700 on both ServerA,B. Here is the log of what I get. debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug1: kex: server->client aes128-ctr hmac-md5 none debug1: kex: client->server aes128-ctr hmac-md5 none debug1: Peer sent proposed langtags, ctos: debug1: Peer sent proposed langtags, stoc: debug1: We proposed langtags, ctos: en-US debug1: We proposed langtags, stoc: en-US debug1: SSH2_MSG_KEX_DH_GEX_REQUEST sent debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP debug1: dh_gen_key: priv key bits set: 125/256 debug1: bits set: 1039/2048 debug1: SSH2_MSG_KEX_DH_GEX_INIT sent debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY debug1: Host 'XXX.XXX.XXX.XXX' is known and matches the RSA host key. debug1: Found key in /XXX/.ssh/known_hosts:1 debug1: bits set: 1061/2048 debug1: ssh_rsa_verify: signature correct debug1: newkeys: mode 1 debug1: set_newkeys: setting new keys for 'out' mode debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug1: newkeys: mode 0 debug1: set_newkeys: setting new keys for 'in' mode debug1: SSH2_MSG_NEWKEYS received debug1: done: ssh_kex2. debug1: send SSH2_MSG_SERVICE_REQUEST debug1: got SSH2_MSG_SERVICE_ACCEPT debug1: Authentications that can continue: publickey,keyboard-interactive debug1: Next authentication method: publickey debug1: Trying private key: /XXXX/.ssh/identity debug1: Trying public key: /xxx/.ssh/id_rsa debug1: Authentications that can continue: publickey,keyboard-interactive debug1: Trying private key: /xxx/.ssh/id_dsa debug1: Next authentication method: keyboard-interactive Password: Password: ServerB has pretty limited actions since its a custom propietary linux. What could be happening? EDIT WITH ANSWER: Problem was that I didnt have those settings enabled in the sshd_config (Refer to accepted answer) AND that while pasting the key from ServerA to ServerB it would interpret the key as 3 separate lines. What I did was, in case you cant use ssh-copy-id like I couldnt. Paste the first line of your key in your "ServerB" authorized_keys file WITHOUT the last 2 characters, then type yourself the missing characters from line 1 and the first one from line 2, this will prevent adding a "new line" between the first and second line of the key. Repeat with the 3d line.

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