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• What scripts should not be ported from bash to python?

  - by Jack

  I decided to rewrite all our Bash scripts in Python (there are not so many of them) as my first Python project. The reason for it is that although being quite fluent in Bash I feel it's somewhat archaic language and since our system is in the first stages of its developments I think switching to Python now will be the right thing to do. Are there scripts that should always be written in Bash? For example, we have an init.d daemon script - is it OK to use Python for it? We run CentOS. Thanks.

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• Error occurs while using SPADE method in R

  - by Yuwon Lee

  I'm currently mining sequence patterns using SPADE algorithm in R. SPADE is included in "arulesSequence" package of R. I'm running R on my CentOS 6.3 64bit. For an exercise, I've tried an example presented in http://en.wikibooks.org/wiki/Data_Mining_Algorithms_In_R/Sequence_Mining/SPADE When I tried to do "cspade(x, parameter = list(support = 0.4), control = list(verbose = TRUE))" R says: parameter specification: support : 0.4 maxsize : 10 maxlen : 10 algorithmic control: bfstype : FALSE verbose : TRUE summary : FALSE preprocessing ... 1 partition(s), 0 MB [0.096s] mining transactions ... 0 MB [0.066s] reading sequences ...Error in asMethod(object) : 's' is not an integer vector When I try to run SPADE on my Window 7 32bit, it runs well without any error. Does anybody know why such errors occur?

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• Brendan Gregg's "Systems Performance: Enterprise and the Cloud"

  - by user12608550

  Long ago, the prerequisite UNIX performance book was Adrian Cockcroft's 1994 classic, Sun Performance and Tuning: Sparc & Solaris, later updated in 1998 as Java and the Internet. As Solaris evolved to include the invaluable DTrace observability features, new essential performance references have been published, such as Solaris Performance and Tools: DTrace and MDB Techniques for Solaris 10 and OpenSolaris (2006)  by McDougal, Mauro, and Gregg, and DTrace: Dynamic Tracing in Oracle Solaris, Mac OS X and FreeBSD (2011), also by Mauro and Gregg. Much has occurred in Solaris Land since those books appeared, notably Oracle's acquisition of Sun Microsystems in 2010 and the demise of the OpenSolaris community. But operating system technologies have continued to improve markedly in recent years, driven by stunning advances in multicore processor architecture, virtualization, and the massive scalability requirements of cloud computing. A new performance reference was needed, and I eagerly waited for something that thoroughly covered modern, distributed computing performance issues from the ground up. Well, there's a new classic now, authored yet again by Brendan Gregg, former Solaris kernel engineer at Sun and now Lead Performance Engineer at Joyent. Systems Performance: Enterprise and the Cloud is a modern, very comprehensive guide to general system performance principles and practices, as well as a highly detailed reference for specific UNIX and Linux observability tools used to examine and diagnose operating system behaviour.  It provides thorough definitions of terms, explains performance diagnostic Best Practices and "Worst Practices" (called "anti-methods"), and covers key observability tools including DTrace, SystemTap, and all the traditional UNIX utilities like vmstat, ps, iostat, and many others. The book focuses on operating system performance principles and expands on these with respect to Linux (Ubuntu, Fedora, and CentOS are cited), and to Solaris and its derivatives [1]; it is not directed at any one OS so it is extremely useful as a broad performance reference. The author goes beyond the intricacies of performance analysis and shows how to interpret and visualize statistical information gathered from the observability tools.  It's often difficult to extract understanding from voluminous rows of text output, and techniques are provided to assist with summarizing, visualizing, and interpreting the performance data. Gregg includes myriad useful references from the system performance literature, including a "Who's Who" of contributors to this great body of diagnostic tools and methods. This outstanding book should be required reading for UNIX and Linux system administrators as well as anyone charged with diagnosing OS performance issues.  Moreover, the book can easily serve as a textbook for a graduate level course in operating systems [2]. [1] Solaris 11, of course, and Joyent's SmartOS (developed from OpenSolaris) [2] Gregg has taught system performance seminars for many years; I have also taught such courses...this book would be perfect for the OS component of an advanced CS curriculum.

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• Career Advice: finding challenging work in software and web development

  - by dianovich

  Having left my physics degree early, I started out in the realm of web design / front end web development and was able to get work quite quickly. I moved on to spend a chunk of my time on servers and gained experience with frameworks like Wordpress and Drupal, then the likes of Codeigniter and CakePHP and became comfortable in Debian-based and RHEL/CentOS environments. I ventured in to iOS development and published a couple of native apps to the app store too! I have started to spend a good deal of my time writing Python and have invested a little time in Django. The problem is, I still spend a fair chunk of my time doing more front end web development (writing markup and CSS for site themes, design-lead JavaScript, small applications for which application architecture and software engineering are relatively unimportant or too time consuming to invest in) in my job. What I want to do is really exercise the systematic/logical portion of my brain and tackle challenging problems on a daily basis. I want to have to care about big-oh running times, modularity in software, DRY, performance tuning and development methodologies. I want to work for a firm whose clients say: "Yes, these things are important to us and we'll pay you to get them right." But it is difficult: I have no formal training and am potentially becoming a jack of all trades. Not that being a jack of many trades is necessarily a bad thing, but the scope of work I find myself involved in is far too broad. And, there are only so many hours in a day outside of work! My question is: where do I go from here? I am starting to work on a few open source projects and have started to publish content to my blog. But this isn't likely to make it past the recruitment consultants and HR departments of many-a-firm. And I do not, for example, work in a team that practices agile methodologies, so how do I get work in such a team to gain experience? While I have been responsible for implementing version control and some solid working practices into our current environment, there is only so far I can go in this context. What would convince you that i'm worth taking a risk? What would convince you that i'll have caught up the other guys in your employ in next to no time?

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• ArchBeat Link-o-Rama for 2012-09-19

  - by Bob Rhubart

  BPM Process Accelerator Packs – Update | Pat Shepherd Architect Pat Shepherd shares several resources relevant to the new Oracle Process Accelerators for Oracle Business Process Management. Oracle BI EE Management Pack Now Available for Oracle Enterprise Manager 12cR2 | Mark Rittman A handy and informative overview from Oracle ACE Director Mark Rittman. WebSockets on WebLogic Server | Steve Button "As there's no standard WebSocket Java API at this point, we've chosen to model the API on the Grizzly WebSocket API with some minor changes where necessary," says James "Buttso" Buttons. "Once the results of JSR-356 (Java API for WebSocket) becomes public, we'll look to implement and support that." Oracle Reference Architecture: Software Engineering This document from the IT Strategies from Oracle library focuses on integrated asset management and the need for efffective asset metadata management to insure that assets are properly tracked and reused in a manner that provides a holistic functional view of the enterprise. The tipping point for cloud management is nigh | Cloud Computing - InfoWorld "Businesses typically don't think too much about managing IT resources until they become too numerous and cumbersome to deal with on an ad hoc basis—a point many companies will soon hit in their adoption of cloud computing." — David Linthicum DevOps Basics: Track Down High CPU Thread with ps, top and the new JDK7 jcmd Tool | Frank Munz "The approach is very generic and works for WebLogic, Glassfish or any other Java application," say Frank Munz. "UNIX commands in the example are run on CentOS, so they will work without changes for Oracle Enterprise Linux or RedHat. Creating the thread dump at the end of the video is done with the jcmd tool from JDK7." Frank has captured the process in the posted video. OIM 11g R2 UI customization | Daniel Gralewski "OIM user interface customizations are easier now, and they survive patch applications--there is no need to reapply them after patching," says Fusion Middleware A-Team member Daniel Gralewski. "Adding new artifacts, new skins, and plugging code directly into the user interface components became an easier task." Daniel shows just how easy in this post. Thought for the Day "I have yet to see any problem, however complicated, which, when looked at in the right way, did not become still more complicated." — Poul Anderson (November 25, 1926 – July 31, 2001) Source: SoftwareQuotes.com

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• Server-infrastructure recommendations

  - by Tim van Elsloo

  Here's the thing: I need a cheap, fast, reliable infrastructure that can dynamically scale (like Amazon S3: cloud-storage). I'm thinking of 3 different type of 'servers'. Application-server Should be able to run CentOS (or another light Linux-distr.) Should be able to run Apache Should be able to run PHP Should be able to run GD (so it does rely on it's cpu). Should be extremely reliable and fast. Database-server Should be able to run MySQL Should be able to... well, do nothing else :P. Should be extremely reliable and fast. Storage-server Should be able to run some kind of file-transfer-deamon (like FTP, CouchDB, etc.) Should be able to do nothing else. Should be extremely reliable and fast. So technically, by transferring all static data to 2 different servers/services, the application-server can totally focus on the webpages. My questions: What services do you recommend? Which is cheaper, faster and more reliable: using my own server, or using some cloud-storage/cloud-computing-service (like Amazon S3, CloudFiles, etc.)? How can I prevent bandwidth abuse (such as dos-attacks causing the bill to be extremely high)? What's the difference between "including CDN" and "excluding CDN"? It seems the price doesn't differ at CloudFiles? Do you have to pay "including CDN" + "excluding CDN" when you decide to enable the delivery-network? Or have you only got to pay "including CDN"? Should I use my own nameserver too or can I use my domain-hoster's nameservers? What are the minimum software specifications of a nameserver. Can I write some software myself? Does anyone have a good protocol-description? I hope you can answer my questions. Answers I shouldn't write my own nameserver-software. Instead, I should use something like bind. (http://osspro.com/2010/05/04/linux-create-your-own-domain-name-server-dns/).

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• Best language on Linux to replace manual tasks that use SSH/Telnet? [on hold]

  - by Calab

  I've been tasked to create and maintain a web browser based interface to replace several of the manual tasks that we perform now. I currently have a "shakey" but working program written in Perl (2779 lines) that uses basic Expect coding, but it has some limitations that require a great deal of coding to get around. Because of this I am going to do a complete rewrite and want to do it "right" this time. My question is this... What would be the best language to use to create a web based interface to perform SSH/Telnet tasks that we would normally do manually? Keep in mind the following requirements: Runs on a CentOS Linux system v5.10 Http will be served by Apache2 This is an INTRANET site and only accessible within our organization. User load will be light. No more that 5 users accessing it at one time. perl 5.8.8, php 5.3.3, python 2.7.2 are available... Not sure what other languages to check for, or what modules might be installed in each language. The web interface will need to provide progress indicators and text output produced by the remote connection, in real time as it is generated. If we are running our process on multiple hosts, they should be in individual threads so that they can run side by side, not sequentially. I want the ability to "trap" on specific text generated by the remote host and display an alert to the user - such as when the remote host generates an error message. I would like to avoid as much client side scripting (javascript/vbscript) as I can. Most users will be on Windows PC's using Chrome or IE as a browser. Users will be downloading the resulting output so they can process it as they see fit. I currently have no experience with "Ajax" or the like. Most of my coding experience is old 6809 assembly, Visual Basic 6, and whatever I can cut/paste from online examples in various languages (hence my "shaky" Perl program) My coding environment is Eclipse for remote code editing, but I prefer stuff like UltraEdit if I can get a decent syntax file for the language I'm using. I do have su access on the server, but I'm not the only one using this server so I can't just upgrade/install blindly as I might impact other software currently running on the machine. One reason that I'm asking here, instead of searching (which I did) is that most replies were, "use language 'xyz', but you need to use an external SSH connection" - like I'm using Expect in my Perl script. Most also did not agree on what language that 'xyz' should be. ...so, after this long posting, can someone offer some advice?

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• cpan won't configure correctly on centos6, can't connect to internet

  - by dan

  I have Centos 6 setup and have installed perl-CPAN. When I run cpan it takes me through the setup and ends by telling me it can't connect to the internet and to enter a mirror. I enter a mirror, but it still can't install the package. What am I doing wrong? If you're accessing the net via proxies, you can specify them in the CPAN configuration or via environment variables. The variable in the $CPAN::Config takes precedence. <ftp_proxy> Your ftp_proxy? [] <http_proxy> Your http_proxy? [] <no_proxy> Your no_proxy? [] CPAN needs access to at least one CPAN mirror. As you did not allow me to connect to the internet you need to supply a valid CPAN URL now. Please enter the URL of your CPAN mirror CPAN needs access to at least one CPAN mirror. As you did not allow me to connect to the internet you need to supply a valid CPAN URL now. Please enter the URL of your CPAN mirror mirror.cc.columbia.edu::cpan Configuration does not allow connecting to the internet. Current set of CPAN URLs: mirror.cc.columbia.edu::cpan Enter another URL or RETURN to quit: [] New urllist mirror.cc.columbia.edu::cpan Please remember to call 'o conf commit' to make the config permanent! cpan shell -- CPAN exploration and modules installation (v1.9402) Enter 'h' for help. cpan[1]> install File::Stat CPAN: Storable loaded ok (v2.20) LWP not available Warning: no success downloading '/root/.cpan/sources/authors/01mailrc.txt.gz.tmp918'. Giving up on it. at /usr/share/perl5/CPAN/Index.pm line 225 ^CCaught SIGINT, trying to continue Warning: Cannot install File::Stat, don't know what it is. Try the command i /File::Stat/ to find objects with matching identifiers. cpan[2]>

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• Cant connect to mysql using self signed SSL certificate

  - by carpii

  After creating a self-signed SSL certificate, I have configured my remote mysqld to use them (and ssl is enabled) I ssh into my remote server, and try connecting to its own mysqld using ssl (mysql server is 5.5.25).. ~> mysql -u <user> -p --ssl=1 --ssl-cert=client.cert --ssl-key=client.key --ssl-ca=ca.cert Enter password: ERROR 2026 (HY000): SSL connection error: error:00000001:lib(0):func(0):reason(1) Ok, I remember reading theres some problem with connecting to the same server via SSL. So I download the client keys down to my local box, and test from there... ~> mysql -h <server> -u <user> -p --ssl=1 --ssl-cert=client.cert --ssl-key=client.key --ssl-ca=ca.cert Enter password: ERROR 2026 (HY000): SSL connection error Its unclear what this "SSL connection error" error refers to, but if I omit the -ssl-ca, then I am able to connect using SSL.. ~> mysql -h <server> -u <user> -p --ssl=1 --ssl-cert=client.cert --ssl-key=client.key Enter password: Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 37 Server version: 5.5.25 MySQL Community Server (GPL) However, I believe that this is only encrypting the connection, and not actually verifying the validity of the cert (meaning I would be potentially vulnerable to man-in-middle attack) The ssl certs are valid (albeit self signed), and do not have a passphrase on them So my question is, what am I doing wrong? How can I connect via SSL, using a self signed certificate? MySQL Server version is 5.5.25 and the server and clients are Centos 5 Thanks for any advice Edit: Note that in all cases, the command is being issued from the same directory where the ssl keys reside (hence no absolute path)

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• Plesk Postfix SMTP 550 5.7.1 "Command rejected" for one external sender

  - by Mnebuerquo

  My server is rejecting emails from one external sender. I suspect this might be misconfiguration on the sending server, but I'm not sure from these error messages. The non-delivery report message the sender gets contains this text: #5.7.1 smtp;550 5.7.1 Command rejected> #SMTP# I also see this message in /var/messages at about the same time as the rejection message was sent, though I'm not sure if it's actually related: Nov 29 12:29:28 localhost postfix/smtpd[31829]: sql_sqlite3 plugin: no result found I'm using Plesk 10.4.4 Update #47, Centos 6.2, Postfix 2.8.4-11100615 on my mail server. This is only happening for one sender so far, but I found a Google result on experts-exchange.com which seemed to identify the same problem and with the same sending domain. This was posted back in June, and currently has no answers, so even if I was a paying customer it wouldn't be answered. (http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Q_27760746.html) The generating server is bigfish.com. What I need to determine is if this is a problem on my server or a problem with bigfish.com. Is there more information I can find in config files, logs, etc. to figure this out?

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• OSX - User home directories shared via NFS

  - by Hugh

  Hi, I've run into some problems with how I've got user home directories set up on our system here. Our server is an XServe, using Open Directory to manage the user accounts. The majority of our workstations are OSX, but there are a few running Linux (Centos 5.3), and, as time goes on, we expect the proportion of Linux workstations to increase (at some point, we expect to move the server side over to Linux too, but for now we're running with what we've already got) To ensure that the Linux and OSX workstations both see user's home directories in the same place, I shared the home directories using NFS. On the server end, the home directories are stored in: /Volumes/data/company_users This is mounted on the workstations to: /mount/company_users This work fine on the Linux workstations, but there is some weirdness under OSX. For the user who is logged in through the GUI, it all works just fine. However, if a user tries to SSH into a machine that they are not the primary user on, they often have no access to their own home directory. It looks as though OSX is trying to do something else to the user home directories mount point when you log in through the GUI.... For example, on this machine (nv001), I (hugh) am logged into the GUI. Last login: Mon Mar 8 18:17:52 on ttys011 [nv001:~] hugh% ls -al /mount/company_users total 40 drwxrwxrwx 26 hugh wheel 840 27 Jan 19:09 . drwxr-xr-x 6 admin admin 204 19 Dec 18:36 .. drwx------+ 128 hugh staff 4308 27 Feb 23:36 hugh drwx------+ 26 matt staff 840 4 Dec 14:14 matt [nv001:~] hugh% So Matt's home directory is accessible to him. However, if I try to switch to him: [nv001:~] hugh% su - matt Password: su: no directory [nv001:~] hugh% Or: [nv001:~] hugh% su matt Password: tcsh: Permission denied tcsh: Trying to start from "/mount/company_users/matt" tcsh: Trying to start from "/" [nv001:/] matt% Does anyone have any idea why it might be doing this? It's causing me all sorts of problems at the moment... The only machine that I can successfully switch users at the moment is the server that the user directories are stored on, where /mount/company_users is actually just a symlink to /Volumes/data/company_users Thanks

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• iptables issue on plesk

  - by Fred Rufin

  i don't know how to open a specific port (rtmp=1935) on my CentOS server using Plesk or itables. I created new rules for port 1935 i/o using Plesk/Modules/Firewall but this doesn't work. Nmap scanning tells me this : 1935/tcp filtered rtmp . So i decided to have look at my iptable using SSH (iptables -L), and iptables seems to contain my rules (tcp spt:macromedia-fcs): Chain INPUT (policy DROP) target prot opt source destination VZ_INPUT all -- anywhere anywhere ACCEPT all -- anywhere anywhere state RELATED,ESTABLISHED REJECT tcp -- anywhere anywhere tcp flags:!FIN,SYN,RST,ACK/SYN reject-with tcp-reset DROP all -- anywhere anywhere state INVALID ACCEPT all -- anywhere anywhere Chain FORWARD (policy DROP) target prot opt source destination VZ_FORWARD all -- anywhere anywhere ACCEPT all -- anywhere anywhere state RELATED,ESTABLISHED REJECT tcp -- anywhere anywhere tcp flags:!FIN,SYN,RST,ACK/SYN reject-with tcp-reset DROP all -- anywhere anywhere state INVALID ACCEPT all -- anywhere anywhere Chain OUTPUT (policy DROP) target prot opt source destination VZ_OUTPUT all -- anywhere anywhere ACCEPT all -- anywhere anywhere state RELATED,ESTABLISHED REJECT tcp -- anywhere anywhere tcp flags:!FIN,SYN,RST,ACK/SYN reject-with tcp-reset DROP all -- anywhere anywhere state INVALID ACCEPT all -- anywhere anywhere Chain VZ_FORWARD (1 references) target prot opt source destination Chain VZ_INPUT (1 references) target prot opt source destination ACCEPT tcp -- anywhere anywhere tcp dpt:http ACCEPT tcp -- anywhere anywhere tcp dpt:ssh ACCEPT tcp -- anywhere anywhere tcp dpt:smtp ACCEPT tcp -- anywhere anywhere tcp dpt:pop3 ACCEPT tcp -- anywhere anywhere tcp dpt:domain ACCEPT udp -- anywhere anywhere udp dpt:domain ACCEPT tcp -- anywhere anywhere tcp dpts:filenet-tms:65535 ACCEPT udp -- anywhere anywhere udp dpts:filenet-tms:65535 ACCEPT tcp -- anywhere anywhere tcp dpt:cddbp-alt ACCEPT tcp -- anywhere anywhere tcp dpt:pcsync-https ACCEPT tcp -- localhost.localdomain localhost.localdomain ACCEPT tcp -- anywhere anywhere tcp dpt:macromedia-fcs ACCEPT udp -- localhost.localdomain localhost.localdomain Chain VZ_OUTPUT (1 references) target prot opt source destination ACCEPT tcp -- anywhere anywhere tcp spt:http ACCEPT tcp -- anywhere anywhere tcp spt:ssh ACCEPT tcp -- anywhere anywhere tcp spt:smtp ACCEPT tcp -- anywhere anywhere tcp spt:pop3 ACCEPT tcp -- anywhere anywhere tcp spt:domain ACCEPT udp -- anywhere anywhere udp spt:domain ACCEPT tcp -- anywhere anywhere ACCEPT udp -- anywhere anywhere ACCEPT tcp -- anywhere anywhere tcp spt:cddbp-alt ACCEPT tcp -- anywhere anywhere tcp spt:pcsync-https ACCEPT tcp -- localhost.localdomain localhost.localdomain ACCEPT tcp -- anywhere anywhere tcp spt:macromedia-fcs ACCEPT udp -- localhost.localdomain localhost.localdomain My rules seems to be OK but there is no connection to 1935 port using a browser. I can connect to this port with SSH (typing "wget myServerIP:1935") but maybe this is because it is an SSH tunelling ? I don't know how to do.

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• Managing scalability and availability with two servers running Apache Httpd, Apache Mina and MySQL

  - by celalo

  Hello, I am not a developer and I don't much experience with scalable server architectures. But I am in need of a highly available and scalable system for one of my projects. There is going to be two servers I am going to use for the time being. Both with 4 core CPUs and 8 GB RAM with RAID structures running CentOS 5.4. I will also have feature called "Failover IP" which enables to direct an IP address to another server within short time. The applications which will be run on the servers: There is going to be a Java application based on Apache Mina server for handling TCP requests from some hundreds of network devices where the devices are going to send request as much as one request per minute. Handling those requests, includes parsing the requests and inserting a few rows to the Database. Parsing requests before inserting data to the DB does take neglectable time. There is going to be MySQL server, as I stated above. Also there is going to be a PHP web application running on Apache Httpd Server which uses the same DB with the Java application. What I wish to have is to make use of those two servers at the most. I was imagining to have the servers identical, sharing the work load. MySQL could be a cluster maybe? And if some application fails or the whole machine goes down, the other will continue serving the requests seamlessly. Reminding that a "Failover IP" feature will be available for me to take advantage of. Also, It should be kept in mind that number of servers could increase in time, to meet the demand. What can you suggest? Which kind of tools I can make use of? Which kind of monitoring software (paid/unpaid) I have? Thanks in advance.

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• Apache reverse-proxy intermittent error 113 - No route to host

  - by BonkaBonka

  I've got an Apache 2.0.52 server on CentOS 4 that front-ends a couple of App servers (mix of Jetty and Tomcat). Apache has a handful of virtual hosts configured like this: <VirtualHost www1.example.com:443> ServerName www1.example.com DocumentRoot "/mnt/app_web/html" SSLEngine on SSLCipherSuite ALL:!ADH:!EXPORT56:RC4+RSA:+HIGH:+MEDIUM:+LOW:+SSLv2:+EXP SSLCertificateFile /etc/httpd/conf/ssl.crt/server.crt SSLCertificateChainFile /etc/httpd/conf/ssl.crt/chain.crt SSLCertificateKeyFile /etc/httpd/conf/ssl.key/server.key SetEnvIf User-Agent ".*MSIE.*" nokeepalive ssl-unclean-shutdown downgrade-1.0 force-response-1.0 RewriteEngine on RewriteRule ^/app1/(.*)$ http://app1.example.com:8080/app1/$1 [P,L] RewriteRule ^/app2/(.*)$ http://app2.example.com:8080/app2/$1 [P,L] </VirtualHost> However, I'm getting the following errors in the logs intermittently: [Fri Dec 04 07:19:41 2009] [error] (113)No route to host: proxy: HTTP: attempt to connect to 10.0.0.1:8080 (app1.example.com) failed I initially tried turning off IPv6, and that seemed to largely cure it, but I still have sporadic bursts of these messages. Additionally, we're running memcache on same front-end and during the times when I'm getting those messages in Apache's log, the following command doesn't work: echo stats | nc 127.0.0.1 11211 No messages are printed, but neither are the stats printed. I am completely lost as to how to proceed with troubleshooting this. =(

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• SSL23_WRITE:ssl handshake failure:s23_lib.c:177

  - by Armin

  When attempting to connect to an xmpp server over SSL, openssl fails with the following error: 3071833836:error:140790E5:SSL routines:SSL23_WRITE:ssl handshake failure:s23_lib.c:177 I believe that the server uses the RC4-MD5 cipher, here is the full output: [root@localhost ~]# openssl s_client -connect 184.106.52.124:5222 -cipher RC4-MD5 CONNECTED(00000003) >>> SSL 2.0 [length 0032], CLIENT-HELLO 01 03 03 00 09 00 00 00 20 00 00 04 01 00 80 00 00 ff b0 c9 c2 3f 0b 0e 98 df b4 dc fe b7 e8 8f 17 9a 34 b5 9b 17 1b 2b ac 01 dc bd 2b a9 2d 18 44 0c 3071866604:error:140790E5:SSL routines:SSL23_WRITE:ssl handshake failure:s23_lib.c:177: --- no peer certificate available --- No client certificate CA names sent --- SSL handshake has read 0 bytes and written 52 bytes --- New, (NONE), Cipher is (NONE) Secure Renegotiation IS NOT supported Compression: NONE Expansion: NONE --- Using gnutls-cli: [root@localhost ~]# gnutls-cli 184.106.52.124 -p 5222 Resolving '184.106.52.124'... Connecting to '184.106.52.124:5222'... *** Fatal error: A TLS packet with unexpected length was received. *** Handshake has failed GNUTLS ERROR: A TLS packet with unexpected length was received. Connecting to the same server on port 5223 works fine. Using OpenSSL 1.0.1e-fips on CentOS 6.5 and OpenSSL 1.0.1f on Ubuntu 14.04.1 Any tips on how to troubleshoot this? Thanks in advance.

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• blu-ray archiving in vmware ESXi 4

  - by spacecadet77

  Hi, I need some advice about using blu-ray writer for archiving data on vmware ESXi 4. At office we have IBM System x3400 Tower server with ESXi 4 hipervisor and OpenSuse and CentOS GNU/Linux system as guests. Will blu-ray writer work in this setup, and if it will is there any particular model you can suggest. Best regards IBM System x3400 Tower server specification: 1x Intel Quad-Core Xeon E5410 2.33GHz/ 12MB/ 1333MHz (2x CPU max) Intel 5000P chipset, 2x 1GB PC2-5300 DDR2 667MHz SDRAM ECC Chipkill (32GB max) 2x4GB (2x2GB) PC2-5300 CL5 ECC DDR2 FBDIMM (x3400, x3550, x3650) SAS/SATA Hot-Swap Open Bay (0xHDD std, 4xHDD max, 8xHDD optional) ServeRAID 8K dual channel SAS/SATA controller (RAID 0,1,1E,10,5,6, 256MB, Battery Backup) Graphics ATI® RN50(ES1000) 16MB DDR, CD-RW/DVD Combo no FDD GigaEthernet, Tower with Power Supply 835W (opt Redudant) Slot 1: half-length, PCI-Express x8(x4 electrical) Slot 2: full, PCI-Express x8 Slot 3: full, PCI-Express x8 Slot 4: full, 64-bit 133MHz 3.3v PCI-X Slot 5: full, 64-bit 133MHz 3.3v PCI-X , Slot 6: half-length, 32-bit 33MHz 5.0v PCI ports: 4x USB (Vers 2.0), 2x PS/2, parallel, 2x serial (9-pin), VGA, RJ-45 (ethernet ), RJ-45 (sys mgm) HDD 4 x TB 7200rpm / Serial ATA II 3.0Gb/s / 16MB, RoHS

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• Host name or Domain not found

  - by hitesh-4259

  Hi I have installed amavis + postfix + spamassassin on centOS 5.4. The "/etc/hosts" file contains: 127.0.0.1 localhost.localdomain localhost ::1 localhost6.localdomain6 localhost6 67.215.65.132 mail.sufalamtech.local mail When I am sending mail then, the following error is occured: Apr 8 06:20:53 mail sendmail[3229]: o380oqu7003229: from=root, size=62, class=0, nrcpts=1, msgid=<[email protected], relay=root@localhost Apr 8 06:20:53 mail postfix/smtpd[3230]: connect from mail.sufalamtech.local[127.0.0.1] Apr 8 06:20:53 mail sendmail[3229]: STARTTLS=client, relay=[127.0.0.1], version=TLSv1/SSLv3, verify=FAIL, cipher=DHE-RSA-AES256-SHA, bits=256/256 Apr 8 06:20:54 mail postfix/smtpd[3230]: 5A53C1A5989: client=mail.sufalamtech.local[127.0.0.1], [email protected] Apr 8 06:20:54 mail postfix/cleanup[3238]: 5A53C1A5989: message-id=<[email protected] Apr 8 06:20:54 mail sendmail[3229]: o380oqu7003229: [email protected], ctladdr=root (0/0), delay=00:00:02, xdelay=00:00:01, mailer=relay, pri=30062, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (Ok: queued as 5A53C1A5989) Apr 8 06:20:54 mail postfix/qmgr[3107]: 5A53C1A5989: from=, size=587, nrcpt=1 (queue active) Apr 8 06:20:54 mail postfix/smtpd[3230]: disconnect from mail.sufalamtech.local[127.0.0.1] Apr 8 06:20:54 mail postfix/smtp[3240]: 5A53C1A5989: to=, relay=none, delay=0.63, delays=0.17/0.1/0.36/0, dsn=5.4.4, status=bounced (Host or domain name not found. Name service error for name=mail.sufalamtech.local type=A: Host not found) Apr 8 06:20:54 mail postfix/cleanup[3238]: E73C51A5987: message-id=<[email protected] Apr 8 06:20:54 mail postfix/qmgr[3107]: E73C51A5987: from=<, size=2594, nrcpt=1 (queue active) Apr 8 06:20:54 mail postfix/bounce[3241]: 5A53C1A5989: sender non-delivery notification: E73C51A5987 Apr 8 06:20:54 mail postfix/qmgr[3107]: 5A53C1A5989: removed Apr 8 06:20:55 mail postfix/local[3242]: E73C51A5987: to=, relay=local, delay=0.15, delays=0.02/0.1/0/0.03, dsn=2.0.0, status=sent (delivered to mailbox) Apr 8 06:20:55 mail postfix/local[3242]: warning: host not found: localhost Apr 8 06:20:55 mail postfix/qmgr[3107]: E73C51A5987: removed Apr 8 06:21:04 mail postfix/qmgr[3107]: warning: connect to transport amavis: No such file or directory Apr 8 06:22:04 mail postfix/qmgr[3107]: warning: connect to transport amavis: No such file or directory

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• ssh tunnel - bind: Cannot assign requested address

  - by JosephK

  Trying to create a socks (-D) ssh tunnel - Linux box to Linux box (both centos): sshd running on remote side ok. From local machine we do / see this: ssh -D 1080 [email protected]. [email protected]'s password: bind: Cannot assign requested address (where 8.8.8.8 is really my server's IP and 'user' is my real username) I am logged into the remote side in this terminal-window. I can verify that the local port was unused prior to this command, and then used by an ssh process, after the command, via: netstat -lnp | grep 1080 So, unlike most googled-responses with this error, the problem would not seem to be the loopback interface assignment. If I try to use this tunnel with a mail client, the local-side permits the attempt (no 'proxy-failed' error), but no data / reply is returned. On the remote side, I do have "PermitTunnel yes" in my sshd_config (though 'yes' should be the default, anyway). Ideas or Clues? Here is the relevant debug-output OpenSSH_5.3p1, OpenSSL 1.0.0-fips 29 Mar 2010 debug1: Reading configuration data /etc/ssh/ssh_config debug1: Applying options for * .... debug1: Authentication succeeded (password). debug1: Local connections to LOCALHOST:1080 forwarded to remote address socks:0 debug1: Local forwarding listening on 127.0.0.1 port 1080. debug1: channel 0: new [port listener] debug1: Local forwarding listening on ::1 port 1080. bind: Cannot assign requested address debug1: channel 1: new [client-session] debug1: Entering interactive session. debug1: Sending environment. debug1: Sending env LANG = en_US.utf8 Other clue: If I run a Virtual Box on the client running Windows, open a tunnel with putty in that box, that tunnel, to the same remote server, works.

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• Nameserver configuration error (Stealth NS records)

  - by Saif Bechan

  Hello i have a nameserver with a primary domain configured. Now i added a second domain, I have set NS records of the second domain to use the first domain, but i get some strange error. When i do the nameserver check at SIDN, for domains in the netherlands, i sais everything is right configured: Errors=0, Warnings=0, Informational=3 ** Summary: ACCEPTED centshopper.nl. ** Full check report: primary name server "ns1.rdshosting.nl." Info: name server looks correctly configured. secondary name server "ns2.rdshosting.nl." Info: name server looks correctly configured. secondary name server "ns3.rdshosting.nl." Info: name server looks correctly configured. ** DNScheck 4.2.6, 2010/03/12 23:19:58 CET+0100 Now when i check my dns settings over at http://intodns.com/centshopper.nl i get the following 2 errors: 1) Missing nameservers reported by parent FAIL: The following nameservers are listed at your nameservers as nameservers for your domain, but are not listed at the parent nameservers (see RFC2181 5.4.1). You need to make sure that these nameservers are working.If they are not working ok, you may have problems! ns3.rdshosting.nl 2) Stealth NS records sent Stealth NS records were sent: ns3.rdshosting.nl I am running plesk icw centos. In my opinion everything is ok. Does anyone know of this error and know what the possible cause would be. I have checked the first few hits on google already, and can't come up with a working solution. On a sidenote, can anyone explain to me what GLUE is and why i am not getting any. If you have been, thanks for reading!

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• Problem: Munin Graph

  - by Pablo

  I've been trying to install Munin for 15 days, I looked for information, analized logs, I even deleted and reinstalled Munin using YUM. I'm hosted at Media Temple on a VPS with CentOS. The problem is still there and It's driving me nuts. Graphics are shown as following: http://imageshack.us/photo/my-images/833/capturadepantalla201106u.png/ This is the configuration of my munin.conf file dbdir /var/lib/munin htmldir /var/www/munin logdir /var/log/munin rundir /var/run/munin [localhost] address **.**.***.*** #IP VPS This is the configuration of my munin-node.conf file log_level 4 log_file /var/log/munin/munin-node.log port 4949 pid_file /var/run/munin/munin-node.pid background 1 setseid 1 # Which port to bind to; host * user root group root setsid yes # Regexps for files to ignore ignore_file ~$ ignore_file \.bak$ ignore_file %$ ignore_file \.dpkg-(tmp|new|old|dist)$ ignore_file \.rpm(save|new)$ allow ^127\.0\.0\.1$ Thanks so much, I appreciate all the answers UPDATE munin-graph.log Jun 22 16:30:02 - Starting munin-graph Jun 22 16:30:02 - Processing domain: localhost Jun 22 16:30:02 - Graphed service : open_inodes (0.14 sec * 4) Jun 22 16:30:02 - Graphed service : sendmail_mailtraffic (0.10 sec * 4) Jun 22 16:30:02 - Graphed service : apache_processes (0.12 sec * 4) Jun 22 16:30:02 - Graphed service : entropy (0.10 sec * 4) Jun 22 16:30:02 - Graphed service : sendmail_mailstats (0.14 sec * 4) Jun 22 16:30:02 - Graphed service : processes (0.14 sec * 4) Jun 22 16:30:03 - Graphed service : apache_accesses (0.27 sec * 4) Jun 22 16:30:03 - Graphed service : apache_volume (0.15 sec * 4) Jun 22 16:30:03 - Graphed service : df (0.21 sec * 4) Jun 22 16:30:03 - Graphed service : netstat (0.19 sec * 4) Jun 22 16:30:03 - Graphed service : interrupts (0.14 sec * 4) Jun 22 16:30:03 - Graphed service : swap (0.14 sec * 4) Jun 22 16:30:04 - Graphed service : load (0.11 sec * 4) Jun 22 16:30:04 - Graphed service : sendmail_mailqueue (0.13 sec * 4) Jun 22 16:30:04 - Graphed service : cpu (0.21 sec * 4) Jun 22 16:30:04 - Graphed service : df_inode (0.16 sec * 4) Jun 22 16:30:04 - Graphed service : open_files (0.16 sec * 4) Jun 22 16:30:04 - Graphed service : forks (0.13 sec * 4) Jun 22 16:30:05 - Graphed service : memory (0.26 sec * 4) Jun 22 16:30:05 - Graphed service : nfs_client (0.36 sec * 4) Jun 22 16:30:05 - Graphed service : vmstat (0.10 sec * 4) Jun 22 16:30:05 - Processed node: localhost (3.45 sec) Jun 22 16:30:05 - Processed domain: localhost (3.45 sec) Jun 22 16:30:05 - Munin-graph finished (3.46 sec)

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• kickstart: reference floppy drive via %ksappend or %include

  - by virtualeyes

  Having trouble getting %ksappend or %include to work when referencing a local floppy drive. Booting off remote server's cd-rom drive I am able to load the CentOS 6 minimal install image, and then add ks=hd:fd0/ks-jvm.cfg to boot params to load kickstart init file from floppy disk. That works fine. The problem is that I want to load a streamlined generic init file off the floppy and then, within the init, %ksappend or %include specific config files relative to the type of server I'm building (JVM, MySQL, Apache, etc.) I do not have DHCP, networking needs to be specified statically, so %ksappend and %include both fail when attempting to reference http://some-LAN-IP/foo.cfg since networking has not yet been set. The kickstart setup only works when I glob in the entire config into a single file, which is great, but ugly and difficult to maintain when I return later, having forgotten the original setup. At this point I'd be happy if I could get %ksappend or %include working with a floppy drive reference in the %post section; that would consolidate a lot of common boilerplate that all kickstarts will rely on (sshd_config, rsync config, resolve.conf, and so on) Thanks for providing the magic floppy drive reference that is eluding me!

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• Simple P2V help from Linux to Windows

  - by Ke.

  I have two OS's installed on different drives in my PC. One linux (Centos 5.4) and one windows 7. Its getting tiresome to constantly have to stop and restart the PC when I want to use either OS. I would very much like to use Windows 7 as my host OS and access my linux OS from within Windows. However, im having trouble deciphering exactly how to do this (many of the articles seem confusing and a bit overkill) From what i have seen its possible to use VMWare converter to convert the physical linux image to a virtual image so that I can use it in windows. As im having problems understanding how this is done, I would really appreciate a step by step guide (for a newbie), or any simple tutorials that you can point me at. Some questions beforehand: 1) My linux image is around 80gb, do i need to take this into consideration? The linux drive is around 180gb in total. All my other drives are NTFS non writeable in linux (as I use them in windows and ntfs is dodgy in linux), so probably not possible to move the image over to my ntfs drives 2) Can I just zip the linux files up somehow and transfer it to windows to create the p2v? 3) Is it possible to do the P2V conversion while I am logged into windows. I can see the actual linux drive loaded in disk manager, but windows doesnt read linux file systems so im confused as to how to access the linux drive if this is possible. 4) Or will i need to do the whole p2v conversion inside linux? Cheers, any help is much appreciated Ke (a confused p2v newbie)

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• Problems during an update of cPanel / WHM

  - by haron

  I ordered a Master WHM account with the couple CentOS / cPanel. whm-cpanel.eu.pn The installation is a fresh update of the basic services was necessary (had: WHM 11.15.0 cPanel 11.17.0 WHM X v3.1.0, Apache 1.3.37, PHP 4.4.7, MySQL 4.1.22). 1 / I started to update cPanel / WHM via the command: / scripts / upcp. Everything went well until the middle of installing the server stopped responding (or ping, or ssh). The installation appears to have continued alone to the end and after some time everything is back to normal (I do not know if there was a reboot) and my interface was updated (cPanel 11.24.4-R36167 - WHM 11.24.2 - X 3.9). 2 / Then I updated via the MySQL interface tweak this in WHM then the command: / scripts / mysqlup. Here everything went fine, no problem. 3 / Finally, I wanted to upgrade Apache 2.2 / PHP 5 and I used this command: / scripts / easyapache. After selecting all the packages and modules installation is started but the same as for point 1: the server did not answer more and this time the installation did not go through. Apache 2.2 is well spent (after the second try) but PHP has remained at 4. I tried several times the same operation without success. I do not think this is a memory problem, a free-m shortly before losing communications gave nothing alarming. By cons CPU time seemed to rise up. I reinstalled the machine again the trick, same problem! Whether via the WHM interface or by Shell, the installation stops short, for 15 minutes the machine is not responding and then everything returns to normal, but no update is done in PHP. Is there a known bug in this version of cPanel / WHM? Someone he met the same problem? If I compile Apache / PHP manually, without using the script easyapache is what I might encounter problems with cPanel later? Thank you!

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• Understanding Linux SCSI queue depths

  - by Troels Arvin

  I'm experimenting with the effects of different SCSI queue depth values on a Dell server running CentOS Linux 5.4 (x86_64). The server has two QLogic QLE2560 FC HBAs connected via multipathing to a storage system. The storage system has allocated two LUNs to the server, each connected through four paths in an active-active-active-active round-robin configuration. All in all, the two LUNs exist as eight /dev/sdX devices, represented by two devices in /dev/mpath. I currently adjust the queue depth values in /etc/modprobe.conf and check the result (after rebooting) by looking in the seventh column of /proc/scsi/sg/devices. Two questions related to that: Is there a way to adjust queue depths without rebooting or unloading the qla2xxx kernel module? E.g., can I echo a new queue depth value into some /proc or /sys-like file to update the queue depth? If I set the queue depth to 128, is that 128 in total for all devices handled by the qla2xxx module?, or 128 for each HBA? (256 in total), or 128 for each of the eight /dev/sdX devices (1024 in toal)?, or 128 for each of the two /dev/mpath/... devices (256 in total)? This is important for me to know so that my server doesn't flood the storage system, affecting other servers connected to it.

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• postfix Mail filters not running behind a controlled enviornment

  - by Ashish

  Hi, I have deployed a postfix server for email receiving. On this I have configured SenderID + SPF milter, by referring to http://www.postfix.org/MILTER_README.html The command that I used is as follows: ./sid-filter -u postfix -p inet:10027@localhost -l Following are my settings in main.cf file: #Milter support for smtpd mail smtpd_milters = inet:localhost:10027, inet:localhost:10028 # Milters for non-SMTP mail. non_smtpd_milters = inet:localhost:10027, inet:localhost:10028 milter_default_action = reject # Postfix . 2.6 #milter_protocol = 6 # 2.3 . Postfix . 2.5 milter_protocol = 2 Now I have this observation: One of the postfix that is setup on AWS CentOS 5.5 is working fine and is able to receive mails on defined mx record. One of the similar postfix(as in step 1) that is setup behind one of the corporate firewalls is not able to receive any mails and is giving following type of error logs: connect from xxxxxx.austin.hp.com[xx.xxx.96.198] May 25 13:20:02 g2t0385g postfix/smtpd[11733]: C11F9B0194: client=xxxxxxx.austin.hp.com[15.217.96.198] May 25 13:20:03 g2t0385g postfix/cleanup[11814]: C11F9B0194: message-id= May 25 13:20:03 g2t0385g postfix/cleanup[11814]: C11F9B0194: milter-reject: END-OF-MESSAGE from xxxxxx.austin.hp.com[xx.xxx.96.198]: 5.7.1 Command rejected; from= to= proto=ESMTP helo= Here the 'sid-filter' is giving problems. Any idea, what I am doing wrong? Please help. Thanks in advance Ashish Sharma

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