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• Why do I have untrusted certificates for Google, Yahoo, Mozilla and others?

  - by jackweirdy

  In the HTTPS/SSL section of chrome://chrome/settings, I see the following: What does this mean, and is there something wrong? I have a basic understanding of SSL/TLS - I'm not claiming to be completely familiar, but I'm fairly confident I know my way around it - but I don't understand why I have certificates installed on my machine specifically for these sites. From my understanding, I should have the certificates for Certificate Authorities, and any site I visit and use SSL/TLS should have a certificate signed by one of these trusted CAs for me to trust the site. My worry is that if someone has maliciously installed a certificate for these sites on my machine, they could perform a DNS spoofing attack (or a number of other attacks) to hijack my connection to my email account without me knowing, and as they've got the private counterpart to the certificate on my machine, decrypt the communication. NB: I'm also aware that CA certificates aren't just within Chromium and are used system wide as part of libssl - they're stored in /etc/ssl/certs. What I'd like to know is: Is this correct? - The big red boxes make me think no Is this malicious or benign? What can I do to resolve this problem? (If indeed it is a problem) Thanks :)

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• Solr error; JNDI not configured for solr; Anybody know what this means?

  - by Camran

  I am installing solr on my VPS (Ubuntu 9.10) via PuTTY. First, I thought about installing Solr with Tomcat, but then after installing tomcat, I changed my mind and went for the Jetty which comes with Solr. Now that I have setup everything on my Server, and try to start the "start.jar" file, I get some errors... Here is some text from the log file: 2010-05-29 00:22:42.074::INFO: jetty-6.1.3 2010-05-29 00:22:42.134::INFO: Extract jar:file:/var/www/webapps/solr.war!/ to /var/www/work/Jetty_0_0_0_0_8983_solr.war__solr__k1kf17/webapp May 29, 2010 12:22:42 AM org.apache.solr.core.SolrResourceLoader locateSolrHome INFO: JNDI not configured for solr (NoInitialContextEx) May 29, 2010 12:22:42 AM org.apache.solr.core.SolrResourceLoader locateSolrHome INFO: solr home defaulted to 'solr/' (could not find system property or JNDI) May 29, 2010 12:22:42 AM org.apache.solr.core.SolrResourceLoader <init> INFO: Solr home set to 'solr/' May 29, 2010 12:22:42 AM org.apache.solr.servlet.SolrDispatchFilter init INFO: SolrDispatchFilter.init() May 29, 2010 12:22:42 AM org.apache.solr.core.SolrResourceLoader locateSolrHome INFO: JNDI not configured for solr (NoInitialContextEx) May 29, 2010 12:22:42 AM org.apache.solr.core.SolrResourceLoader locateSolrHome INFO: solr home defaulted to 'solr/' (could not find system property or JNDI) May 29, 2010 12:22:42 AM org.apache.solr.core.CoreContainer$Initializer initialize INFO: looking for solr.xml: /var/www/solr/solr.xml May 29, 2010 12:22:42 AM org.apache.solr.core.SolrResourceLoader <init> INFO: Solr home set to 'solr/' Anybody know what this is? Thanks

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• "File" exists or not

  - by SnailTang

  ls -il ls: cannot access éaj/p+st.ó·e: No such file or directory ls: cannot access éaj/p+st.ó·e: No such file or directory ls: cannot access é@j/p¦ft.¦·N: No such file or directory ls: cannot access é@j/p¦ft.¦·N: No such file or directory total 55456 ? -????????? ? ? ? ? ? éaj/p+st.ó·e ? -????????? ? ? ? ? ? éaj/p+st.ó·e ? -????????? ? ? ? ? ? é@j/p¦ft.¦·N ? -????????? ? ? ? ? ? é@j/p¦ft.¦·N and when i use to show these files, i get the info: p+st.ó·e p¦ft.¦·N Please, where do these files or somethings others exist. Or what makes them show here.

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• do i need a dns server?

  - by ajsie

  i have set up a website (lamp) in a vps from a hosting company. im wondering, in what circumstances would i want to set up a dns server on my vps? cause from what i have learned basically a dns just converts domain names into ip addresses. and at the moment my domain provider is doing this in their dns. so in what situations do i benefit from setting up an own dns server?

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• Alternatives to native LDAP

  - by Matt

  We've implemented an LDAP to NIS solution and have begun transitioning some systems to native LDAP binding for authentication and automount maps. Unfortunately we have a very mixed environment with more than 20 *nix environments. The setup for each variant is of course unique and has required various workarounds to get full functionality. We're now at the point where we're willing to revisit the solution and possibly migrate toward something like Likewise (http://www.likewise.org), but would like to know what others are using to solve this problem.

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• Unix Permissions issue with users belonging to the same group accessing a folder

  - by TK Kocheran

  I have a folder I'd really like to allow another user on this machine access to. I'm using mt-daapd to serve music to the network, so I'd like to enable the mt-daapd user to access my Music directory, /home/rfkrocktk/Music. The master user is rfkrocktk obviously. I've tried to set all of my permissions properly on the directory, but the mt-daapd user can't acces the files. I created a group called media-users and added both rfkrocktk and mt-daapd to it in order to give mt-daapd permission to simply read all of the files in that directory and subdirectories. If I run id on each of my users, here's what's displayed: $ id rfkrocktk > uid=1000(rfkrocktk) gid=1000(rfkrocktk) groups=1000(rfkrocktk),4(adm),20(dialout),24(cdrom),29(audio),46(plugdev),104(lpadmin),115(admin),120(sambashare),124(vboxusers),1001(jupiter),2002(media-users) $ id mt-daapd > uid=123(mt-daapd) gid=65534(nogroup) groups=65534(nogroup),2002(media-users) It definitely seems that both users are a part of the media-users group, so what could be going wrong? If I run ls -l on the actual Music directory to see its permissions, here's the output: drwxr-Sr-- 201 rfkrocktk media-users 12288 2011-01-13 12:26 Music If I run ls -l on the Music directory to get its children, here's the output: drwxr-Sr-- 3 rfkrocktk media-users 4096 2010-12-20 15:31 2DBoy drwxr-Sr-- 3 rfkrocktk media-users 4096 2010-05-25 12:50 ABBA drwxr-Sr-- 3 rfkrocktk media-users 4096 2009-12-28 15:19 Access Denied drwxr-Sr-- 10 rfkrocktk media-users 4096 2009-12-28 15:19 AC-DC drwxr-Sr-- 3 rfkrocktk media-users 4096 2009-12-28 15:19 Aerosmith drwxr-Sr-- 3 rfkrocktk media-users 4096 2010-06-04 10:45 A Flock of Seagulls drwxr-Sr-- 4 rfkrocktk media-users 4096 2010-05-28 18:13 Alestorm drwxr-Sr-- 3 rfkrocktk media-users 4096 2010-06-22 23:29 Amon Amarth drwxr-Sr-- 5 rfkrocktk media-users 4096 2009-12-28 15:19 Anberlin ... From this, it would seem that I should be able to access the folders from mt-daapd, but I can't. Running sudo -i -u mt-daapd ls -l /home/rfkrocktk/Music displays nothing, indicating to me that for whatever reason, mt-daapd doesn't have access to read the folder. What am I doing wrong?

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• Wicd not playing well with networks that utilize network access control

  - by Sion

  Starting a couple months ago (might be able to find exact date if necessary) my installation of Wicd stopped being able to see wireless networks that use NAC (Network Access Control) such as Aruba networks. But if I shut down Wicd and start NetworkManager I can connect to said networks and log in to them depending on what the NAC requires. This is the current wicd package installed: net-misc/wicd-1.7.1_pre20111210-r1 This is how I manipulate the network manager running: su -c'/etc/init.d/wicd stop; /etc/init.d/NetworkManager start' What would cause this specific of a problem to occur?

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• Change XRDP keyboard layout to en-gb Ubuntu 12.04

  - by Earl Sven

  Does anybody know how to change the keyboard layout to en-gb in an XRDP session on Ubuntu 12.04? I am using mstsc.exe to connect to an XRDP server hosting an XVNC session, however I cannot work out how to apply the UK keyboard layout. A bit of googling has yeilded these instructions which allow me to change the keymap, however using the keymap file I downloaded from here I loose the ability to use the arrow keys, home/end etc. Comparing the file with the standard one there are substantially more differences than I would expect considering the similarity between the layouts. I only have RDP access to the box so i don't seem to be able to actually generate a new layout per the instructions above, maybe it's a local console thing? Also I can't change either the RDP client used or the RDP server as they are my only access to the system, I don't have local console access. I do have root priveleges on the OS however. Any thoughts? Edit: I have found http:// xrdp.sourceforge.net/documents/keymap/newkeymap.html (apologies for not typing the link properly but the antispam filter won't let me post more than 2 links) this documentation on the XRDP sourceforge page which describes keymap file format. It indicates the values in the keymap files are unicode 0x64 etc, however the files I have already on my system seem to use a different format 0:0 or 65307:27 etc, does anybody know what the difference is?

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• How do I surround a line with quotes on bash?

  - by obvio171

  When I run for i in $(find -name '*.ogg'); do echo '$i'; done I don't get one line per file as I expected. Instead, when a file name has a space in it, each word comes out in a separate line, so I can't run commands on the files.

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• Apache directory structure with multiple hosted languages.

  - by anomareh

  I just got a new work machine up and running and I'm trying to decide on how to set everything up directory wise. I've done some digging around and really haven't been able to find anything conclusive. I know it's a question with a variety of answers but I'm hoping there's some sort of general guidelines or best practices to go by. With that said, here are a few things specific to my situation. I will be doing actual development and testing on the same machine as the server. It is a single user machine in the sense that I will be the only one working on the machine. There will be multiple hosted languages, specifically PHP and RoR while possibly expanding later. I'd like the setup to translate well to a production environment. With those 3 things in mind there are a couple of things I've had in the back of mind. Seeing as it's a single user machine I haven't been able to decide whether or not I should be working on things out of my home directory or if they should be located outside of it. I'm feeling that outside of a user directory would be better as it would translate better to a production environment, but I'm also not sure if that will come with any permission annoyances or concerns seeing as I'll be working on the same machine. Hosting multiple languages seems like it may be a bit quirky. With PHP I've found you're generally just dumping the project somewhere in the document root where as something like a Rails app you have the entire project and you only want the public directory in the document root. Thanks for any insight, opinion, or just personal preference from experience anyone can offer.

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• opennebula VM submission failure

  - by user61175

  I am new to OpenNebula, the cloud is up and running but the VM is failed to be submitted to a node. I got the following error from the log file. ERROR: Command "scp ubuntu:/opt/nebula/images/ttylinux.img node01:/var/lib/one/8/images/disk.0" failed. ERROR: Host key verification failed. Error excuting image transfer script: Host key verification failed. The key verification keeps failing. I need to know what is going wrong ... thanks :)

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• Server high memory usage at same time every day

  - by Sam Parmenter

  Right, we moved one of our main sites onto a new AWS box with plenty of grunt as it would allow us more control that we had before and future proof ourselves. About a month ago we started running into issues with high memory usage at the same time every day. In the morning an export is run to export data to a file which is the FTPed to a local machine for processing. The issues were co-inciding with the rough time of the export but when we didn't run the export one day, the server still ran into the same issues. The export has been run at other times in the day since to monitor memory usage to see if it spikes. The conclusion is that the export is fine and barely touches the sides memory wise. No noticeable change in memory usage. When the issue happens, its effect is to kill mysql and require us to restart the process. We think it might be a mysql memory issue, but might just be that mysql is just the first to feel it. Looking at the logs there is no particular query run before the memory usage hits 90%. When it strikes at about 9:20am, the memory usage spikes from a near constant 25% to 98% and very quickly kills mysql to save itself. It usually takes about 3-4 minutes to die. There are no cron jobs running at that time of the day and we haven't noticed a spike in traffic over the period of the issues. Any help would be massively appreciated! thanks.

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• Varnish "FetchError no backend connection" error

  - by clueless-anon

  Varnishlog: 0 CLI - Rd ping 0 CLI - Wr 200 19 PONG 1340829925 1.0 12 SessionOpen c 79.124.74.11 3063 :80 12 SessionClose c EOF 12 StatSess c 79.124.74.11 3063 0 1 0 0 0 0 0 0 0 CLI - Rd ping 0 CLI - Wr 200 19 PONG 1340829928 1.0 0 CLI - Rd ping 0 CLI - Wr 200 19 PONG 1340829931 1.0 12 SessionOpen c 108.62.115.226 46211 :80 12 ReqStart c 108.62.115.226 46211 467185881 12 RxRequest c GET 12 RxURL c / 12 RxProtocol c HTTP/1.0 12 RxHeader c User-Agent: Pingdom.com_bot_version_1.4_(http://www.pingdom.com/) 12 RxHeader c Host: www.mysite.com 12 VCL_call c recv lookup 12 VCL_call c hash 12 Hash c / 12 Hash c www.mysite.com 12 VCL_return c hash 12 VCL_call c miss fetch 12 FetchError c no backend connection 12 VCL_call c error deliver 12 VCL_call c deliver deliver 12 TxProtocol c HTTP/1.1 12 TxStatus c 503 12 TxResponse c Service Unavailable 12 TxHeader c Server: Varnish 12 TxHeader c Content-Type: text/html; charset=utf-8 12 TxHeader c Retry-After: 5 12 TxHeader c Content-Length: 418 12 TxHeader c Accept-Ranges: bytes 12 TxHeader c Date: Wed, 27 Jun 2012 20:45:31 GMT 12 TxHeader c X-Varnish: 467185881 12 TxHeader c Age: 1 12 TxHeader c Via: 1.1 varnish 12 TxHeader c Connection: close 12 Length c 418 12 ReqEnd c 467185881 1340829931.192433119 1340829931.891024113 0.000051022 0.698516846 0.000074035 12 SessionClose c error 12 StatSess c 108.62.115.226 46211 1 1 1 0 0 0 256 418 0 CLI - Rd ping 0 CLI - Wr 200 19 PONG 1340829934 1.0 0 CLI - Rd ping 0 CLI - Wr 200 19 PONG 1340829937 1.0 netstat -tlnp Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 0.0.0.0:8080 0.0.0.0:* LISTEN 3086/nginx tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 1915/varnishd tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 1279/sshd tcp 0 0 127.0.0.2:25 0.0.0.0:* LISTEN 3195/sendmail: MTA: tcp 0 0 127.0.0.2:6082 0.0.0.0:* LISTEN 1914/varnishd tcp 0 0 127.0.0.2:9000 0.0.0.0:* LISTEN 1317/php-fpm.conf) tcp 0 0 127.0.0.2:3306 0.0.0.0:* LISTEN 1192/mysqld tcp 0 0 127.0.0.2:587 0.0.0.0:* LISTEN 3195/sendmail: MTA: tcp 0 0 127.0.0.2:11211 0.0.0.0:* LISTEN 3072/memcached tcp6 0 0 :::8080 :::* LISTEN 3086/nginx tcp6 0 0 :::80 :::* LISTEN 1915/varnishd tcp6 0 0 :::22 :::* LISTEN 1279/sshd /etc/nginx/site-enabled/default server { listen 8080; ## listen for ipv4; this line is default and implied listen [::]:8080 default ipv6only=on; ## listen for ipv6 root /usr/share/nginx/www; index index.html index.htm index.php; # Make site accessible from http://localhost/ server_name localhost; location / { # First attempt to serve request as file, then # as directory, then fall back to index.html try_files $uri $uri/ /index.html; } location /doc { root /usr/share; autoindex on; allow 127.0.0.2; deny all; } location /images { root /usr/share; autoindex off; } #error_page 404 /404.html; # redirect server error pages to the static page /50x.html # #error_page 500 502 503 504 /50x.html; #location = /50x.html { # root /usr/share/nginx/www; #} # proxy the PHP scripts to Apache listening on 127.0.0.1:80 # #location ~ \.php$ { # proxy_pass http://127.0.0.1; #} # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000 # location ~ \.php$ { fastcgi_pass 127.0.0.2:9000; fastcgi_index index.php; include fastcgi_params; } # deny access to .htaccess files, if Apache's document root # concurs with nginx's one # #location ~ /\.ht { # deny all; #} } /etc/nginx/sites-enabled/www.mysite.com.vhost server { listen 8080; server_name www.mysite.com mysite.com.net; root /var/www/www.mysite.com/web; if ($http_host != "www.mysite.com") { rewrite ^ http://www.mysite.com$request_uri permanent; } index index.php index.html; location = /favicon.ico { log_not_found off; access_log off; } location = /robots.txt { allow all; log_not_found off; access_log off; } # Deny all attempts to access hidden files such as .htaccess, .htpasswd, .DS_Store (Mac). location ~ /\. { deny all; access_log off; log_not_found off; } location / { try_files $uri $uri/ /index.php?$args; } # Add trailing slash to */wp-admin requests. rewrite /wp-admin$ $scheme://$host$uri/ permanent; location ~* \.(jpg|jpeg|png|gif|css|js|ico)$ { expires max; log_not_found off; } location ~ \.php$ { try_files $uri =404; include /etc/nginx/fastcgi_params; fastcgi_pass 127.0.0.2:9000; fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name; } include /var/www/www.mysite.com/web/nginx.conf; location ~ /nginx.conf { deny all; access_log off; log_not_found off; } } /etc/varnish/default.vcl # This is a basic VCL configuration file for varnish. See the vcl(7) # man page for details on VCL syntax and semantics. # # Default backend definition. Set this to point to your content # server. # backend default { .host = "127.0.0.2"; .port = "8080"; # .connect_timeout = 600s; #.first_byte_timeout = 600s; # .between_bytes_timeout = 600s; # .max_connections = 800; Note: uncommenting the last four options at default.vcl made no difference. cat /etc/default/varnish # Configuration file for varnish # # /etc/init.d/varnish expects the variables $DAEMON_OPTS, $NFILES and $MEMLOCK # to be set from this shell script fragment. # # Should we start varnishd at boot? Set to "yes" to enable. START=yes # Maximum number of open files (for ulimit -n) NFILES=131072 # Maximum locked memory size (for ulimit -l) # Used for locking the shared memory log in memory. If you increase log size, # you need to increase this number as well MEMLOCK=82000 # Default varnish instance name is the local nodename. Can be overridden with # the -n switch, to have more instances on a single server. INSTANCE=$(uname -n) # This file contains 4 alternatives, please use only one. ## Alternative 1, Minimal configuration, no VCL # # Listen on port 6081, administration on localhost:6082, and forward to # content server on localhost:8080. Use a 1GB fixed-size cache file. # # DAEMON_OPTS="-a :6081 \ # -T localhost:6082 \ # -b localhost:8080 \ # -u varnish -g varnish \ # -S /etc/varnish/secret \ # -s file,/var/lib/varnish/$INSTANCE/varnish_storage.bin,1G" ## Alternative 2, Configuration with VCL # # Listen on port 6081, administration on localhost:6082, and forward to # one content server selected by the vcl file, based on the request. Use a 1GB # fixed-size cache file. # DAEMON_OPTS="-a :80 \ -T 127.0.0.2:6082 \ -f /etc/varnish/default.vcl \ -S /etc/varnish/secret \ -s file,/var/lib/varnish/$INSTANCE/varnish_storage.bin,1G" If you need any other info let me know. I am all out of clue as to whats the problem.

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• Indirect Postfix bounces create new user directories

  - by hheimbuerger

  I'm running Postfix on my personal server in a data centre. I am not a professional mail hoster and not a Postfix expert, it is just used for a few domains served from that server. IIRC, I mostly followed this howto when setting up Postfix. Mails addressed to one of the domains the server manages are delivered locally (/srv/mail) to be fetched with Dovecot. Mails to other domains require usage of SMTPS. The mailbox configuration is stored in MySQL. The problem I have is that I suddenly found new mailboxes being created on the disk. Let's say I have the domain 'example.com'. Then I would have lots of new directories, e.g. /srv/mail/example.com/abenaackart /srv/mail/example.com/abenaacton etc. There are no entries for these addresses in my database, neither as a mailbox nor as an alias. It's clearly spam from auto-generated names. Most of them start with 'a', a few with 'b' and a couple of random ones with other letters. At first I was afraid of an attack, but all security restrictions seem to work. If I try to send mail to these addresses, I get an "Recipient address rejected: User unknown in virtual mailbox table" during the 'RCPT TO' stage. So I looked into the mails stored in these mailboxes. Turns out that all of them are bounces. It seems like all of them were sent from a randomly generated name to an alias that really exists on my system, but pointed to an invalid destination address on another host. So Postfix accepted it, then tried to redirect it to another mail server, which rejected it. This bounced back to my Postfix server, which now took the bounce and stored it locally -- because it seemed to be originating from one of the addresses it manages. Example: My Postfix server handles the example.com domain. [email protected] is configured to redirect to [email protected]. [email protected] has since been deleted from the Hotmail servers. Spammer sends mail with FROM:[email protected] and TO:[email protected]. My Postfix server accepts the mail and tries to hand it off to hotmail.com. hotmail.com sends a bounce back. My Postfix server accepts the bounce and delivers it to /srv/mail/example.com/bob. The last step is what I don't want. I'm not quite sure what it should do instead, but creating hundreds of new mailboxes on my disk is not what I want... Any ideas how to get rid of this behaviour? I'll happily post parts of my configuration, but I'm not really sure where to start debugging the problem at this point.

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• running vmstat around a command

  - by svrist

  Im trying to automate a long list of database experiments. I would like to save vmstat output while specific parts of the experiments are running. Does something exist along the lines of time(1) or script(1) that I could use to say: " While this command is running, save vmstat 2(or similar) output to a file " I am aware that vmstat gives my vmstat for the complete system including other processes, but that is OK for my usage. (Running Ubuntu 9.10 if that makes a difference)

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• multiple wildcard entries

  - by Murali

  my client has around 300,000 domains and they just have a wildcard for all of them * A 12.12.12.12 Now they want to create a sub domain that points to a different IP and still have the flexibility of wildcard, something like ww1.* A 24.24.24.24 * A 12.12.12.12 Looks like in BIND, the lower "*" is catch-all and taking over every query and hence ww1 is not working. One of solutions offered by IT folks was to create seperate 300K zones for just "ww1" and leave the "*" wildcard. Are there any other DNS software's that can achieve this task easily? Any other ways to deal?

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• Permissions problem on mounting afp drive

  - by Ron Gejman

  I am trying to mount a network drive via AFP on an Ubuntu 10.04 server machine. After installing AFP support, I use the following command: sudo mount_afp afp://USER:[email protected]/directory/ /media/dir This seems to work and it tells me that mounting succeeded. However, when I navigate to /media/dir I get the following error: cd: cfs: Input/output error Permissions in /media are: d????????? ? ? ? ? dir/ drwx------ 12 user 4.0K 2010-10-25 16:08 otherdisk/ So there is a permissions problem here. I eventually want to mount this drive automatically using fstab. What do I need to do to make the disk accessible?

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• How to use supervisord to run a PHP script as a daemon?

  - by Alasdair

  I need to have 8 threads of the same PHP script running in the background on a server continuously (as a daemon), and each script need to be automatically restarted if it exits for any reason. I've been advised to use supervisord to do this, but I don't at all understand their documentation, which seems very complicated to me. I also want each of the 8 threads of the script to be initially started at 2 minute intervals (2 minutes in between each launch) but then after this all 8 threads of the same PHP script should continue running on the server forever (and restarting if any exit for any reason). Could someone please explain how to do this with supervisord, or any other easy way of doing it? I'm on CentOS 6. Thank you!

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• changing ext4 journal data mode with remount?

  - by Amos Shapira

  I'm tweaking ext4 file system for speed, one tweak at a time. First tweak is to change from "data=ordered" to "data=writeback". To test this, I execute "mount -n -o remount,data=ordered /" but I keep getting "mount: / not mounted already, or bad option". From lots of google'ing I found many questions about similar problems and one answer circa 2001+ext3 which says that you can't change the journal mode with remount. Is this limitation still current?

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• Python error after installing libboost-all-dev on debian [migrated]

  - by Cameron Metzke

  A friend of mine wanted the liboost libraries installed on our shared computer so after installing libboost-all-dev 1.49.0.1 ( A debian wheezy machine ), I get this error when using the "pydoc modules" command on the commandline. It spits out the following error -- root@debian:/usr/include/c++/4.7# pydoc modules Please wait a moment while I gather a list of all available modules... **[debian:49065] [[INVALID],INVALID] ORTE_ERROR_LOG: A system-required executable either could not be found or was not executable by this user in file ../../../../../../orte/mca/ess/singleton/ess_singleton_module.c at line 357 [debian:49065] [[INVALID],INVALID] ORTE_ERROR_LOG: A system-required executable either could not be found or was not executable by this user in file ../../../../../../orte/mca/ess/singleton/ess_singleton_module.c at line 230 [debian:49065] [[INVALID],INVALID] ORTE_ERROR_LOG: A system-required executable either could not be found or was not executable by this user in file ../../../orte/runtime/orte_init.c at line 132 -------------------------------------------------------------------------- It looks like orte_init failed for some reason; your parallel process is likely to abort. There are many reasons that a parallel process can fail during orte_init; some of which are due to configuration or environment problems. This failure appears to be an internal failure; here's some additional information (which may only be relevant to an Open MPI developer): orte_ess_set_name failed --> Returned value A system-required executable either could not be found or was not executable by this user (-127) instead of ORTE_SUCCESS -------------------------------------------------------------------------- -------------------------------------------------------------------------- It looks like MPI_INIT failed for some reason; your parallel process is likely to abort. There are many reasons that a parallel process can fail during MPI_INIT; some of which are due to configuration or environment problems. This failure appears to be an internal failure; here's some additional information (which may only be relevant to an Open MPI developer): ompi_mpi_init: orte_init failed --> Returned "A system-required executable either could not be found or was not executable by this user" (-127) instead of "Success" (0) -------------------------------------------------------------------------- *** The MPI_Init() function was called before MPI_INIT was invoked. *** This is disallowed by the MPI standard. *** Your MPI job will now abort. [debian:49065] Abort before MPI_INIT completed successfully; not able to guarantee that all other processes were killed!** root@debian:/usr/include/c++/4.7# I tried looking into the problem and ended up uninstalling the following to get it to work again. openmpi common all 1.4.5-1 libibverbs-dev amd64 1.1.6-1 libopenmpi-dev amd64 1.4.5-1 mpi-default-dev amd64 1.0.1 libboost-mpi-python1.49.0 although pydoc works again, I'm assuming the packages I removed are gunna hurt somethiong else down the track ? As you guessed im not a c/c++ programmer. So I guess my question is, will this hurt something later ? is their a way to install those packages without hurting python ?

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• Install 64-bit Ubuntu or 32-bit?

  - by nitbuntu

  I'll be receiving a new notebook in a few days and was planning on running Ubuntu on it as it's compatible and the notebook has no OS pre-installed. The specifications are: Core 2 Duo, T6600, 4 GB RAM, Intel integrated graphics. I know a year or two ago, running a 64-bit version of Ubuntu was not advised due to much of the applications and plugins (e.g. Flash) only running on 32-bit. Is this still the case? Would I get better performance with 64-bit Ubuntu since I have 4 GB of RAM? Are there any downsides anymore?

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• Cent OS ifcfg configuration for ranges of IP's with different netmask

  - by Aaron Schlegel

  I have 1 set of 30 public IP's with a netmask of 255.255.255.0 and another set of 30 IP's with a netmask of 255.255.255.128. Both sets of IP's also have different gateways. How can I virtually assign the IP's to the machine? I have tried creating ifcfg-eth0:0 ifcfg-eth0:1 ifcfg-eth0:X ect for each IP. Below is my ifcfg file with. I have this for each IP with the correct gateway IP and netmask for each of my 60 IP's. If I do ip addr show it does show all of the 60 addresses with the correct broadcast IP and netmask. However I can only use 30 of my IP's that are from the same netmask. Am I doing this correctly? If the IP's show up with ip addr show does that mean I have correctly assigned them to the machine virtually? I want to check before I blame my hosting company for not routing the IP's correctly. DEVICE="eth0:1" BOOTPROTO="static" DNS1="**.**.**.**" DNS2="**.**.**.**" GATEWAY="2**.**.***.126" HOSTNAME="localhost.localdomain" HWADDR="0*:19:**:**:**:**" IPADDR="2**.*.**.**" IPV6INIT="no" MTU="1500" NETMASK="255.255.255.128" NM_CONTROLLED="yes" ONBOOT="yes" TYPE="Ethernet" Also is there a better way to do this? I have used ifcfg-eth0:0-range1 before to assign a range of IP's from the same netmask. Is it possible to do this with ranges with different netmask? Thanks!

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• What can lead to a zone memory exhaustion and how Nginx reacts to it?

  - by Miles Hughes

  What is a possible scenario for exhausting the memory designated to a connection zone with limit_conn_zone directive and what are the implication in this case? Suppose I have this in my configuration: http { limit_conn_zone $binary_remote_addr zone=connzone:1m; ... server { limit_conn connzone 5; which, according to the documentation, allocates 16000 states for connzone on a 64-bit server. It also says that If the storage for a zone is exhausted, the server will return error 503 (Service Temporarily Unavailable) to all further requests. Well, Ok. But what does it mean on practice? When does this happen? Who receives those 503s? Does it mean that if the number of IPs somehow associated with connzone hits 16000 everyone gets a 503 and it's all over? How does Nginx decide? The documentation is weirdly vague on this. So, considering the example config, who would actually get a 503 and under which circumstances and how would things go from there? Same with request zones?

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• How to change MySQL data directory?

  - by Jonathan Frank

  I want to place my databases in another directory, so I can store them in an ESB (elastic block storage, just a fancy name for a virtualized harddisk) together with my web-apps and other persistent data. I have tried to walk through a tutorial at http://crashmag.net/change-the-default-mysql-data-directory-with-selinux-enabled. Everything seems fine until I type this command: # semanage fcontext -a -t mysqld_db_t "/srv/mysql(/.*)?" Then the command fails and tells me that mysqld_db_t is an invalid SELinux context even if the default MySQL data directory is labelled with this context. I am running Fedora 15 on Virtualbox (behaves like an ordinary x86-compatible box) and Amazon EC2 (based on Xen) so the tutorial should be compatible. It is also worth to mention that turning off SELinux globally or just for the MySQL process is not an option, because such a solution will decrease the security of the system if a hacker gains access to the system via the MySQL server. I have never seen this problem before I changed to the Redhat/Fedora architecture, so it could be a distribution specific issue. Any help is highly appreciated

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• XBMC launching external applications full screen

  - by Aquadisco

  Running xbmc-standalone (Eden) on Ubuntu server edition 12.04 (no gnome/kde/etc...). When launching another application via 'advanced launcher' or other launcher add-on XBMC goes into a 'windowed mode' and the app shows up in a 'windowed' mode. The XBMC and app windows are cascaded and most of the screen is unused. This is obviously not what i'd like. I'd like the app to launch full screen. ideas? Other info: - using lightdm - tried with 'Rom Browser' - tried with 'Advanced Launcher' - once app had launched, tried to 'toggle full screen' in app, but with no success

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