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• DDoS nulling to some ips and other options?

  - by Prix

  I am looking for some information in regards DDoS in the follow scenario: I have a server that is behind a Cisco Guard and it will be DDoS'ed, I only care about a set list of IPS that by not means are the attackers. Is it possible to null all other ips but this list to actually get any response to my server or in the long run no matter what I do if they have enough DDoS power I will just go down like a flie ? Is there any recommended company out there that can actually cope with a DDoS ? My server will mainly run several clients that will get connected to a external server and all it needs access to is my local MySQL the the private network so I can access it. There will be no other services runnings such as web or ftp etc at least not to the external ips of the server if i ever have to have any of these service they will be on the private network. The MySQL will be available externally only to 1 safe ip not known by anyone but me and internally at localhost + private network. Are there any solutions ?

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• Apache Server not working in MAMP

  - by jasonaburton

  Here's what I did before the problem started: I was creating a database for a site that I am working on in phpMyAdmin. I wrote some code to try to connect to the database I just created and I couldn't connect. I assumed it might be because I needed a password to connect to the database, so I created a password for it. Immediately after I created the password phpMyAdmin kicked me out saying: "#1045 - Access denied for user 'root'@'localhost' (using password: YES)" "phpMyAdmin tried to connect to the MySQL server, and the server rejected the connection. You should check the host, username and password in your configuration and make sure that they correspond to the information given by the administrator of the MySQL server." I found the php.ini file and searched for where I could change the password to match the one I just made, but couldn't find where I needed to change it. So I decided to scrap the database and uninstall MAMP from my computer and reinstall it hoping it would just reset all the defaults and I could go on my merry way. But now after reinstalling MAMP and trying to run the servers Apache won't start up and I have no idea why. One problem after another... Any advice or helpful ideas?

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• How to connect to a remote server and run some code on that particular server?

  - by seedeg

  I am implementing an automated backup scheme so I created a shell script which first creates SQL Dumps for all MySQL databases, then it retrieves all the websites from the /var/www of a remote server. The latter is working as I am using rsync to get the remote files. However, obviously, the MySQL dumps being retrieved are the ones on the local server which is not what I want. I want to get the SQL Dumps from the remote server as well. I have a tunnel between the local and remote server which I can connect without using any password (I added the public key to the authorized_hosts), so I tried to add the following code to the script: ssh [email protected] Then I tried to retrieve the SQL dumps and then I exit from the remote server. However this does not work as I still have to enter exit manually in the terminal for the SQL dumps to be retrieved from the remote host. I don't know why this is happening. Basically this is what the script is trying to do: //connect to remote server ssh [email protected] //retrieve SQL dumps //code to retrieve... //exit from remote server exit //use rsync to get remote files of /var/www from local server (working) Is there a way to connect to the remote host AND run the script's code ON THAT remote host? Many thanks in advance

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• Load is 0, yet site crawls (sometimes). What gives?

  - by Yegor

  I have a ~1.5-2mil page views per day site running on 2 servers. One for mysql, other for everything else. Mysql box has a load of 3, frontend is usually 0.0-0.1. Both are dual quad core with 8GB ram running SAS drives in raid5. CPU is idle for majority of the time, iowait is non-existent. Im running nginx, memcache, and site is built on php. Half the time everything runs perfect, while at other times it lags something severe, when it takes 10-15 seconds for a page to load. Page execution time is always super low, but it seems to hang, waiting for something before it actually loads the page. Whats even more weird is that it only happens to 1 file on the site (but its the one thats most commonly accessed, that actually loads the content on the site). Other pages are super fast at all times, even when it takes 15 seconds to load actual content. I have nginx_stats plugin installed, and if I monitor it, the lag spikes happen when the write column starts going above 100, and it frequently does... all the way to 500-1000. It does so at totally random times... not when traffic is heavy... it can do this in the middle of the night, and work perfectly at 5pm when traffic is at its highest. Any ideas?

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• Proper web server setup

  - by DMin

  I just got myself a slicehost basic slice to play around with so I can learn how to setup web-servers. I have Ubuntu 10.04.2 installed on the server. I was able to successfully get the server up and running from scratch, these were the things I did - following this tutorial. I know this is probably just a starters tutorial, so, I was wondering if you guys can tell me what you like to do while setting up production servers. These are the steps that were followed : Update and Upgrade Ubuntu sudo apt-get install apache2 php5-mysql libapache2-mod-php5 mysql-server Backup a copy of and edit apache2.conf Set : 'ServerTokens Full' to 'ServerTokens Prod''ServerSignature On' to 'ServerSignature Off' Backup php.ini and then Change “expose_php = On” to “expose_php = Off” Restart Apache Install Shorewall firewall Configure Shorewall to only accept HTTP and SSH connections(in the rules file) Enable shorewall on startup Add the website to the server : sudo usermod -g www-data root sudo chown -R www-data:www-data /var/www sudo chmod -R 775 /var/www I want make this CommunityWiki but can't seem to find the option to do it. Please feel free to add any feedback on the processes and things I am doing right/wrong. Much appriciated, thanks! :)

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• AWS: Multi-region setup using single RDS instance

  - by Ion

  I'm trying to scale our web application (PHP, MySQL, memcache) in a multi-region scheme. Currently we are using a setup with two EC2 instances behind an ELB and an RDS instance, all of them in US-EAST (Virginia) region. We would like to have a presence in the EU (Ireland) region as well. This means at least a new EC2 instance there (identical to the others, serving the same application). I have copied the desired AMI, setup the new instance, setup a same ELB configuration (required for SSL termination) and configured latency-based routing in Route53. And it works as suggested. But, clients from EU have speed problems. This is due to the fact that the EU EC2 instances connect to the US-based RDS instance. As far as I know Amazon has not yet enabled RDS multi-region replication. Do you have any suggestions on how to properly speed up the whole setup while using the single RDS instance? Also, any ideas in general on how to scale things up? Ideally we would like to continue using the RDS technology for various reasons. Nevertheless, I am open to suggestions (I guess the next idea would be to host our own MySQL servers).

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• Migrating to AWS Cloud with auto-scaling - where to put Redis and ElasticSearch?

  - by RobMasters

  I've been trying to research this topic but haven't found anywhere that recommends where to install services such as Redis and ElasticSearch when migrating to a cloud framework. I'm currently running a Symfony2 application on 2 static servers - one is running MySQL and the other is the public facing web server, which also has Redis and ElasticSearch running on it. Both of these servers are virtualised, but they're static in terms of not being able to replicate at present (various aspects are still dependent on the local filesystem). The goal is to migrate to AWS and use auto-scaling to be able to spin up and kill web servers as required, but I'm not clear on what I should put on each EC2 instance. Should they be single-responsibility only? i.e. Set up individual instances for the web server(s), Redis, and ElasticSearch and most likely an RDS instance for MySQL and only set up auto-scaling on the web server(s)? I don't foresee having to scale the ElasticSearch server anytime soon as it's only driving the search functionality, but it's possible that Redis may need to be replicated at some point - but should this be done manually? I'm not sure of how this could be done automatically as each instance needs to be configured to know about it's master/slave(s) as far as I know. I'd appreciate advice on this. One more quick question while I'm here - how would I be able to deploy code changes when there are X web servers currently active? I'm using a Capifony deployment script (Symfony2 version of Capistrano), which I think can handle multiple servers easily enough by specifying an array of :domain addresses...but how can should this be handled when the number of web servers can vary?

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• need some help figuring out clamav & monit monitoring error...unixsocket...

  - by Ronedog

  I need a bit of help figuring something out. First off, I'm not very well versed with FreeBSD servers, etc. but with some direction hopefully I can get this fixed. I'm using FreeBSD and installed Monit so I could monitor some of the processes that run tomcat, apache, mysql, sendmail, clamav. So far, I'm only successful in getting apache & mysql to be monitored. I'm getting this error for clamav in the log file for /var/log/monit.log 'clamavd' failed, cannot open a connection to UNIX[/usr/local/etc/rc.d/clamav-clamd] My config file for clamav in /etc/monitrc is: #################################################################### # CLAMAV Virus Checks #################################################################### check process clamavd with pidfile /var/run/clamav/clamd.pid group virus start program = "/usr/local/etc/rc.d/clamav-clamd start" stop program = "/usr/local/etc/rc.d/clamav-clamd stop" if failed unixsocket /usr/local/etc/rc.d/clamav-clamd then restart if 5 restarts within 5 cycles then timeout Honestly, I really don't know much of what's going on here. My host who helped me get the box set up basically installed clamav, but doesn't offer this kind of detail in supporting me, so I'm left to figure this stuff out on my own as I own the box, but they provide the isp service. Is there anyone who can help me troubleshoot this? Thanks for your help in advance.

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• On Windows machines, what is the typical toolchain for remote maintenance?

  - by Hanno Fietz

  I need to deploy PHP and Python code and the appropriate environment (web server, db server) to remote Windows systems, and I don't know what toolchain would be the equivalent to ssh, scp, bash and the like. So, basically, what I need to be able to do is the following: access remote Windows with the appropriate privileges in a secure manner, like I routinely do with ssh (I don't even know whether that would be a text or graphic interface on Windows). remotely install software: Apache or IIS, MySQL or Postgres, Python or PHP copy files from remote (the application we're deploying) remotely configure the machine to run regular tasks (e. g. checking for updates to the application) automate tasks like downloading files from a designated place The main question is probably how I get onto the machine securely in the first place, and then the rest is general Windows admin knowledge, which probably is too broad a scope to fit into one question. I have years of experience with maintaining Linux boxes and I have used tools of varying sophistication on those, ranging from plain scping of PHP files to deployment of Java application containers and even full VMs with Vagrant. On Windows, I'm a complete noob, and I don't even know where to start. I have installed Apache, MySQL , PHP on a desktop machine maybe twice in my life, that's about it. Bonus points for things that work from a Linux machine at my end, but I could run a VM and do everything from there.

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• Windows 8 using as a webserver

  - by Jason

  I have a few hobby websites that I currently host on CentOS 6. Apache, mail serving, PHP, MySQL nothing special. In the past I used Windows XP to do this same task, for years, and I was OK. I switched to Linux and for the last few years it has been such a pain. updates break, certain apps only support certain distros without compiling from source. It prevents me from working on my hobby sites more because I am always fixing something. With Windows I locked it down, I run a hardware firewall and packet analyser, kept up on updates and A/V and never had a problem. I dont allow RDC from outside the local LAN, no FTP open, run OpenSSH on an obscure port.. I am considering switching to Windows 8 (since it is a cheaper license now that Windows 7) and running apache, HMailServer, PHP, MySQL, just like my CentOS install. My questions: I am not familiar with Windows 8, can the above be done like XP? No new security restrictions or the OS preventing this from happening? The machine is a Athlon 64-bit X2 with 32GB of RAM. Will Windows 8 see all of the RAM? Technically the machine came with Windows 7, and there is a serial number on it but I am sure I wiped away the Windows 7 recovery partition when I switched to Linux....

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• Cacti Login Page: Infinite loop occurs

  - by beicha

  Apache 2.2.3 | PHP 5.1.6 | MySQL 5.0.77 I followed cacti installation guide to install latest cacti 0.8.7h on CentOS 5.5 (64-bit). The installation of PHP/Apache/MySQL went smoothly until I finished the setup, and came to the login page. I can login http://.../cacti/index.php with admin account but the new page is redirected to the same login page with the message "Please enter your Cacti user name and password below" This is a infinite loop! If I use a wrong admin password I get the correct error message "Invalid User Name/Password Please Retype". [Same problem here] If I login use Guest/guest account, "Error: Access Denied, user account disabled." displays. The Cacti log file (./cacti/log/cacti.log) is empty. I Googled and seems this problem has existed for a long time, but no followup solutions were found on the forum posts I found. Anyone can help me on this problem? If more information needed, please let me know. Nov 18, 2011 UPDATE: I re-installed Cacti, this question remains UNSOLVED.

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• In APC+PHP, how much RAM is too much? Is it okay to set apc.shm_size to many GB?

  - by Jeremy Clarke

  On our server we have a LOT of RAM for our traffic levels (16GB). The HTTP processes regularly eat up all CPU and need to be restarted without even getting close to using swap memory, so I'm looking for ways to spend RAM to ease the load on Apache (and/or help the seperate MySQL server which may be breaking Apache). I have many WordPress installs on the HTTPD instance so APC sometimes uses as much as 900MB of ram (according to the apc.php charts). Just in case I have apc.shm_size set to 1600MB which is more than it needs but not more than I can spare. This means there is usually lots of extra RAM available to APC but also very little turnover and fragmentation is never more than 1%. Is this dangerous? Should I be slimming down APC to less than 1GB just on principle? Should I be expecting some turnover within APC in the name of bringing it's overall footprint down? Having so much memory devoted to APC means that in top/htop every single httpd process shows ~1.9GB in the VIRT memory column. Obviously this is shared memory and not used per-process, but could it be hurting our server? NOTE: The problem with the server remains unclear but the effect is that about 60 times a day all 8 CPU's fill up to 100% and everything stops working until Monit sees that Apache is broken and restarts it (Monin also saves the MySQL server). I'm not sure if APC is even part of the problem but I'm trying to optimize everything just in case.

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• Remote access to phpmyadmin from computer belongs to same LAN

  - by Charles

  OK... I solved it. It is because I have not configured the httpd.conf to allow the centos listen port 80 and 8080. Listen 80 Listen 8080 I have setup the myphpadmin on my CentOS 6.4 recently. I can access and login to the myphpadmin on my localhost. However, when I type http://[hostipaddr]/phpmyadmin on my other computer in the same LAN with the CentOS, the browser simply cannot access the page. Below are some of the current configuration. Anyone can help please......? config.inc.php $i++; /* Authentication type */ $cfg['Servers'][$i]['auth_type'] = 'http'; /* Server parameters */ $cfg['Servers'][$i]['host'] = 'localhost'; $cfg['Servers'][$i]['connect_type'] = 'tcp'; $cfg['Servers'][$i]['compress'] = false; /* Select mysql if your server does not have mysqli */ $cfg['Servers'][$i]['extension'] = 'mysql'; $cfg['Servers'][$i]['AllowNoPassword'] = false; phpmyadmin.conf <Directory /var/www/html/phpmyadmin/> order allow,deny allow from all </Directory> Furthermore, I can access the webpage that stored in the CentOS from my other computer without problems. After using wireshark and tcpdump, I found that the server (the Cent OS) keep resetting the connection. (192.168.1.106 is my other computer, 192.168.1.101 is my CentOS) 23:29:42.281473 IP 192.168.1.106.55999 > 192.168.1.101.webcache: Flags [S], seq 2559409090, win 65535, options [mss 1460,nop,wscale 8,nop,nop,sackOK], length 0 23:29:42.281504 IP 192.168.1.101.webcache > 192.168.1.106.55999: Flags [R.], seq 0, ack 2559409091, win 0, length 0 I have disabled the iptables service on the CentOS already.

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• Server slowdown

  - by Clinton Bosch

  I have a GWT application running on Tomcat on a cloud linux(Ubuntu) server, recently I released a new version of the application and suddenly my server response times have gone from 500ms average to 15s average. I have run every monitoring tool I know. iostat says my disks are 0.03% utilised mysqltuner.pl says I am OK other see below top says my processor is 99% idle and load average: 0.20, 0.31, 0.33 memory usage is 50% (-/+ buffers/cache: 3997 3974) mysqltuner output [OK] Logged in using credentials from debian maintenance account. -------- General Statistics -------------------------------------------------- [--] Skipped version check for MySQLTuner script [OK] Currently running supported MySQL version 5.1.63-0ubuntu0.10.04.1-log [OK] Operating on 64-bit architecture -------- Storage Engine Statistics ------------------------------------------- [--] Status: +Archive -BDB -Federated +InnoDB -ISAM -NDBCluster [--] Data in MyISAM tables: 370M (Tables: 52) [--] Data in InnoDB tables: 697M (Tables: 1749) [!!] Total fragmented tables: 1754 -------- Security Recommendations ------------------------------------------- [OK] All database users have passwords assigned -------- Performance Metrics ------------------------------------------------- [--] Up for: 19h 25m 41s (1M q [28.122 qps], 1K conn, TX: 2B, RX: 1B) [--] Reads / Writes: 98% / 2% [--] Total buffers: 1.0G global + 2.7M per thread (500 max threads) [OK] Maximum possible memory usage: 2.4G (30% of installed RAM) [OK] Slow queries: 0% (1/1M) [OK] Highest usage of available connections: 34% (173/500) [OK] Key buffer size / total MyISAM indexes: 16.0M/279.0K [OK] Key buffer hit rate: 99.9% (50K cached / 40 reads) [OK] Query cache efficiency: 61.4% (844K cached / 1M selects) [!!] Query cache prunes per day: 553779 [OK] Sorts requiring temporary tables: 0% (0 temp sorts / 34K sorts) [OK] Temporary tables created on disk: 4% (4K on disk / 102K total) [OK] Thread cache hit rate: 84% (185 created / 1K connections) [!!] Table cache hit rate: 0% (256 open / 27K opened) [OK] Open file limit used: 0% (20/2K) [OK] Table locks acquired immediately: 100% (692K immediate / 692K locks) [OK] InnoDB data size / buffer pool: 697.2M/1.0G -------- Recommendations ----------------------------------------------------- General recommendations: Run OPTIMIZE TABLE to defragment tables for better performance MySQL started within last 24 hours - recommendations may be inaccurate Enable the slow query log to troubleshoot bad queries Increase table_cache gradually to avoid file descriptor limits Variables to adjust: query_cache_size (> 16M) table_cache (> 256)

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• VPS Memory Exchausted Even With Light Settings

  - by user101570

  Linux noob here. I have a 256MB VPS on Ubuntu 11.04 server and when I run "free -m" the result shows all memory being used (including the second line re: buffers/cache). I found this very strange, considering I only have 5 Apache processes running each chewing up about 20MB each. MYSQL is taking up 30MB. To my knowledge, and according to "top", I have no other memory hogs operating. Settings that may be relevant: PHP memory_limit = 32M MYSQL key_buffer = 16M Prefork MPM Maxclients = 10 So when I reviewed these settings, I naturally thought maxclients was too high, so I tried switching it to 5. Now not only does my memory still show as being 100% used, my website loads much, much slower, despite not getting any traffic aside from mine at the moment. I don't understand this. I thought a single Apache process handles all requests from a client received within the "KeepAliveTimeout" window, which I've set to 2 seconds. With my initial config. of 10 maxclients, my page load times are around .3ms, so a single process should handle that no problem, correct? So next I went to an extreme level of 1 for maxclients. My memory is still at 100% usage and my site loads painfully slow. I'm a noob at a complete loss here. According to the many tutorials I've read on basic server setup, I should be good to go. Help! Please! Edit: total used free shared buffers cached Mem: 256 256 0 0 0 0 -/+ buffers/cache: 256 0 Swap: 0 0 0

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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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• PuTTY inserts random characters during a session

  - by Zachary Polikarpus

  I recently started renting space on a remote server so that I could work on a project. I found that a relatively painless way to access it on a windows machine is through PuTTY. However, there is one thing that has always irked me when using it: for seemingly no reason random characters are sometimes inserted at the cursor. Most of the time it is just a single tilde, but rarely it spits out what looks like some escape sequence ([[^8 or the like). It will only occur when I am focused on the window, whether I am typing or 20 feet away from the keyboard. If left for long enough, it will spit tildes at random intervals (average is about 1 minute). Finally, this behavior seems to be inconsistant when running programs such as nano or the mysql interface: in nano, instead of inserting tildes, it will set marks (ctrl-^); in mysql, lines will become un-editable. My question is this: Has anyone else experienced this sort of behavior in PuTTY? And if so, what can be done to prevent/correct this behavior?

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• Adjust iptables

  - by madunix

  cat /etc/sysconfig/iptables: # Firewall configuration written by system-config-securitylevel # Manual customization of this file is not recommended. *filter :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] :RH-Firewall-1-INPUT - [0:0] -A INPUT -j RH-Firewall-1-INPUT -A FORWARD -j RH-Firewall-1-INPUT -A RH-Firewall-1-INPUT -i lo -j ACCEPT -A RH-Firewall-1-INPUT -p icmp --icmp-type any -j ACCEPT -A RH-Firewall-1-INPUT -p 50 -j ACCEPT -A RH-Firewall-1-INPUT -p 51 -j ACCEPT -A RH-Firewall-1-INPUT -p udp --dport 5353 -d X.0.0.Y -j ACCEPT -A RH-Firewall-1-INPUT -p udp -m udp --dport 631 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 443 -j ACCEPT -A RH-Firewall-1-INPUT -p tcp -m tcp -s X.Y.Z.W --dport 3306 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp -s M.M.M.M --dport 3306 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 21 -j ACCEPT -A RH-Firewall-1-INPUT -j REJECT --reject-with icmp-host-prohibited COMMIT I have the above following IPtables on my linux web server(Apache/MySQL), I want to have the following: Block any traffic from multiple IP's to my web server IP1:1.2.3.4.5, IP2:6.7.8.9 ..etc Limiting one host to 20 connections to 80 port, which should not affect non-malicious user, but would render slowloris unusable from one host. Limit MYSQL port 3306 access on my server only to the following IP range A.B.C.D/255.255.255.240 Block any ICMP traffic.

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• PHP Page Stopped outputting content After Running "yum install php-devel" Command

  - by stwhite

  This error is bizarre but after running the "yum install php-devel" command (after a long day of trying to install Facedetect and OpenCV for face detection) my site stopped functioning. The site uses mysql and php. When you hit the url, the page executes the mysql and the php, but it appears to randomly stop outputting the content of the page. None of the code was changed and the site was working flawlessly prior to running the mentioned ssh command. I do use output buffering in the site, but after removing the calls "ob_flush", "ob_end_flush" and "ob_start" it didn't appear to help—still having issues with the site. Any ideas what this could be? Here is output from terminal: [myserver ~]# cd Facedetect-4b1dfe1 [myserver Facedetect-4b1dfe1]# phpize Configuring for: PHP Api Version: 20090626 Zend Module Api No: 20090626 Zend Extension Api No: 220090626 [myserver Facedetect-4b1dfe1]# configure bash: configure: command not found [myserver Facedetect-4b1dfe1]# phpize && configure && make && make install Configuring for: PHP Api Version: 20090626 Zend Module Api No: 20090626 Zend Extension Api No: 220090626 bash: configure: command not found bash: Read: command not found [myserver Facedetect-4b1dfe1]# make make: *** No targets specified and no makefile found. Stop. [myserver Facedetect-4b1dfe1]# yum install php5-devel

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• Persistent PuTTY sessions for multiple windows

  - by Tgr

  I'm working in various Linux environments through PuTTY connections which break from time to time. I'm looking for a solution to make the PuTTY windows persist (e.g. if I was editing a file, then after reconnecting I should be in the same editor with the same file open at the same place), with the following requirements: it shouldn't require any manual setup at the beginning of the session or after reconnection (I don't want to type in screen or anything like that) I have several windows open to the same machine with the same user, which tend to disconnect at the same time the number/role of windows is not constant (it's not like I have an mc window, a mysql window and a "script runner" window; sometimes I use one window for search or for SVN commands, other times I need several at the same time) sometimes I need to change the properties of the windows for a task (large window for grepping/editing, small windows because I need to see two of them at the same time, red background because I am modifying the live database in MySQL etc), so I need to get the same console back in the same window after a reconnect Is there a way to achieve this? I suppose I should use screen or something equivalent, but how does it know which window I am reconnecting from? Is there some way to pass a unique window identifier to the shell from PuTTY?

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• Managed LAMP platform for maximizing availability and global reach, not scalability

  - by user66819

  Assume a Linux/Apache/MySQL/PHP application for a small base of registered users. With small userbase, there are no traffic peaks so the scalability that cloud platforms offer is not imperative. But the system is mission-critical, so availability is the primary goal. Users are also distributed across Asia, Europe, and US, so multiple server locations that minimize users' network hops would be highly desirable. The dream: a managed VPS platform where we would configure a single server (uploading PHP and other files, manipulating database, etc.), and the platform would automatically mirror the server in a handful of key places around the world (say one on each US coast, one in Europe, one in east Asia). File system synchronization and MySQL replication would happen automatically. Core operating system is managed, so we don't need to do full system administration and security, and low-level backups are also done by service provider, though we also do our own backups as well. Couple this with some sort of DNS geo-detection, so users are routed to the nearest operational server... with support for https, of course. Does such a dream exist? If not, what are some approaches to accomplish the same end with minimal time investment and minimal monthly hosting costs?

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• sudoer scheme to allow useful access to another web developer yet retain future control of a virtual

  - by Tchalvak

  Background: Virtual Private Server I have a virtual private server that I'm looking to host multiple websites on, and provide access to another web developer. I don't care about putting too many constraints on him, though I wouldn't mind isolating the site that he'll be developing from other sites on the server that I will develop. The problem: retain control Mainly what I want is to make sure that I retain control over the server in the future. I want to reserve the ability to create/promote/demote and other administrative functions that don't deal with web software. If I make him an admin, he can sudo su - and become root and remove root control from me, for example. I need him not to be able to: take away other admin permissions change the root password have control over other security/administrative functions I would like him to still be able to: install software (through apt-get) restart apache access mysql configure mysql/apache reboot edit web development configuration type files in /etc/ Other Standard Setups would be happily considered I've never really set up a good sudoers file, so simple example setups would be very useful, even if they're only somewhat similar to the settings that I'm hoping for above. Edit: I have not yet finalized permissions, so standard, useful sudo setups are certainly an option, the lists above are more what I'm hoping I can do, I don't know that that setup can be done. I'm sure that people have solved this type of problem before somehow, though, and I'd like to go with something somewhat tested as opposed to something I've homegrown.

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• How to "drag and drop" folders or multiple HTML files into a browser and have them open in multiple tabs

  - by PoorLuzer

  I save pages that I browse on the net and find interesting into a folder called C:\PageSaves Later, during the commute, I open these pages to see what they are and move them into a neatly categorized folder tree. For example, Perl related pages goto C:\Pages\Perl, MySQL related pages goto C:\Pages\MySQL and so on. I was wondering if there is any way I could open any number of HTML files on disc / inside a folder (C:\PageSaves in my case) into Mozilla/FF/K-Meleon etc For example, I would like to just "drag and drop" the folder C:\PageSaves into FireFox and have it open all the .html pages in the folder in a separate tab Right now, if I "drag and drop" multiple HTML files, it just opens the last file in the selection. Have a set of toolbar buttons, basically, a (the) plugin that should allow me to nuke the page (if I don't want to keep the page anymore) from disc or move the file (and its corresponding folder) into a predefined / new folder I am familiar with coding full blown FireFox plugins, so even if something very basic/almost similar exists, I can take it forward. Hints/clues/other methods of achieving the same result are all welcome!

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• Terminal is not letting me make commands unless I hit enter a bunch of times

  - by ninja08

  Whenever I open terminal it normally allows me to immediately begin making commands. Only earlier today I did the setup for github here https://help.github.com/articles/set-up-git And then all of a sudden the thing where I give terminal commands won't allow me to give it commands unless I hit enter a few times. This is what it looks like: Last login: Fri Nov 9 11:43:28 on ttys001 mysql.save: Permission denied mysql.save: Permission denied /Users/Nick/.zshrc:32: command not found:  . ~ git: ? ~ git: ? ~ git: ? See the big space? That's because it simply will never show the ~ git: thing unless I hit enter 3-4 times. Also, it never used to say ~ git: before I did the git setup. I'm not sure what I changed. I've checked the zshrc file and commented everything out to find the line causing the problem. I've done that and it turns out it was the source $ZSH/oh-my-zsh.sh Within the oh-my-zsh.sh file I've commented out each block of code for the file starting at the top and I've found that this block is causing it: # Load the theme if [ "$ZSH_THEME" = "random" ] then themes=($ZSH/themes/*zsh-theme) N=${#themes[@]} ((N=(RANDOM%N)+1)) RANDOM_THEME=${themes[$N]} source "$RANDOM_THEME" echo "[oh-my-zsh] Random theme '$RANDOM_THEME' loaded..." else if [ ! "$ZSH_THEME" = "" ] then if [ -f "$ZSH_CUSTOM/$ZSH_THEME.zsh-theme" ] then source "$ZSH_CUSTOM/$ZSH_THEME.zsh-theme" else source "$ZSH/themes/$ZSH_THEME.zsh-theme" fi fi fi

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• How can I prevent a DDOS attack on Amazon EC2?

  - by cwd

  One of the servers I use is hosted on the Amazon EC2 cloud. Every few months we appear to have a DDOS attack on this sever. This slows the server down incredibly. After around 30 minutes, and sometimes a reboot later, everything is back to normal. Amazon has security groups and firewall, but what else should I have in place on an EC2 server to mitigate or prevent an attack? From similar questions I've learned: Limit the rate of requests/minute (or seconds) from a particular IP address via something like IP tables (or maybe UFW?) Have enough resources to survive such an attack - or - Possibly build the web application so it is elastic / has an elastic load balancer and can quickly scale up to meet such a high demand) If using mySql, set up mySql connections so that they run sequentially so that slow queries won't bog down the system What else am I missing? I would love information about specific tools and configuration options (again, using Linux here), and/or anything that is specific to Amazon EC2. ps: Notes about monitoring for DDOS would also be welcomed - perhaps with nagios? ;)

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