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• Redmine plug-in fails at rake db:migrate_plugins

  - by Drew

  Hey, First post, so hope I'm in the right place. While trying to install the Redmine plug-in 'Wiki Extensions', I keep getting stuck when I try to run the "rake db:migrate_plugins RAILS_ENV=production" command. I am moving server and I'm in bit over my head. Haven't found anything on Google that has helped me much, though I might have missed something. I have pasted in the output with --trace: (in /srv/www/vastpark.org/redmine) ** Invoke db:migrate_plugins (first_time) ** Invoke environment (first_time) ** Execute environment ** Execute db:migrate_plugins Migrating engines... Migrating acts_as_activity_provider... Migrating acts_as_attachable... Migrating acts_as_customizable... Migrating acts_as_event... Migrating acts_as_list... Migrating acts_as_searchable... Migrating acts_as_tree... Migrating acts_as_versioned... Migrating acts_as_watchable... Migrating awesome_nested_set... Migrating classic_pagination... Migrating coderay-0.9.2... Migrating gravatar... Migrating open_id_authentication... Migrating prepend_engine_views... Migrating redmine_wiki_extensions... == CreateWikiExtensionsComments: migrating =================================== -- create_table(:wiki_extensions_comments) rake aborted! An error has occurred, all later migrations canceled: Mysql::Error: Table 'wiki_extensions_comments' already exists: CREATE TABLE 'wiki_extensions_comments' ('id' int(11) DEFAULT NULL auto_increment PRIMARY KEY, 'wiki_page_id' int(11), 'key_word' varchar(255), 'user_id' int(11), 'comment' text, 'created_at' datetime, 'updated_at' datetime) ENGINE=InnoDB

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• Simulated NAT Traversal on Virtual Box

  - by Sumit Arora

  I have installed virtual box ( with Two virtual Adapters(NAT-type)) - Host (Ubuntu -10.10) - Guest-Opensuse-11.4 . Objective : Trying to simulate all four types of NAT as defined here : https://wiki.asterisk.org/wiki/display/TOP/NAT+Traversal+Testing Simulating the various kinds of NATs can be done using Linux iptables. In these examples, eth0 is the private network and eth1 is the public network. Full-cone iptables -t nat -A POSTROUTING -o eth0 -j SNAT --to-source iptables -t nat -A PREROUTING -i eth0 -j DNAT --to-destination Restricted cone iptables -t nat POSTROUTING -o eth1 -p tcp -j SNAT --to-source iptables -t nat POSTROUTING -o eth1 -p udp -j SNAT --to-source iptables -t nat PREROUTING -i eth1 -p tcp -j DNAT --to-destination iptables -t nat PREROUTING -i eth1 -p udp -j DNAT --to-destination iptables -A INPUT -i eth1 -p tcp -m state --state ESTABLISHED,RELATED -j ACCEPT iptables -A INPUT -i eth1 -p udp -m state --state ESTABLISHED,RELATED -j ACCEPT iptables -A INPUT -i eth1 -p tcp -m state --state NEW -j DROP iptables -A INPUT -i eth1 -p udp -m state --state NEW -j DROP Port-restricted cone iptables -t nat -A POSTROUTING -o eth0 -j SNAT --to-source Symmentric echo "1" /proc/sys/net/ipv4/ip_forward iptables --flush iptables -t nat -A POSTROUTING -o eth1 -j MASQUERADE --random iptables -A FORWARD -i eth1 -o eth0 -m state --state RELATED,ESTABLISHED -j ACCEPT iptables -A FORWARD -i eth0 -o eth1 -j ACCEPT What I did : OpenSuse guest with Two Virtual adapters - eth0 and eth1 -- eth1 with address 10.0.3.15 /eth1:1 as 10.0.3.16 -- eth0 with address 10.0.2.15 now running stund(http://sourceforge.net/projects/stun/) client/server : Server eKimchi@linux-6j9k:~/sw/stun/stund ./server -v -h 10.0.3.15 -a 10.0.3.16 Client eKimchi@linux-6j9k:~/sw/stun/stund ./client -v 10.0.3.15 -i 10.0.2.15 On all Four Cases It is giving same results : test I = 1 test II = 1 test III = 1 test I(2) = 1 is nat = 0 mapped IP same = 1 hairpin = 1 preserver port = 1 Primary: Open Return value is 0x000001 Q-1 :Please let me know If any has ever done, It should behave like NAT as per description but nowhere it working as a NAT. Q-2: How NAT Implemented in Home routers (Usually Port Restricted), but those also pre-configured iptables rules and tuned Linux

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• placing shell script under systemd control

  - by Calvin Cheng

  Assuming I have a shell script like this:- #!/bin/sh # cherrypy_server.sh PROCESSES=10 THREADS=1 # threads per process BASE_PORT=3035 # the first port used # you need to make the PIDFILE dir and insure it has the right permissions PIDFILE="/var/run/cherrypy/myproject.pid" WORKDIR=`dirname "$0"` cd "$WORKDIR" cp_start_proc() { N=$1 P=$(( $BASE_PORT + $N - 1 )) ./manage.py runcpserver daemonize=1 port=$P pidfile="$PIDFILE-$N" threads=$THREADS request_queue_size=0 verbose=0 } cp_start() { for N in `seq 1 $PROCESSES`; do cp_start_proc $N done } cp_stop_proc() { N=$1 #[ -f "$PIDFILE-$N" ] && kill `cat "$PIDFILE-$N"` [ -f "$PIDFILE-$N" ] && ./manage.py runcpserver pidfile="$PIDFILE-$N" stop rm -f "$PIDFILE-$N" } cp_stop() { for N in `seq 1 $PROCESSES`; do cp_stop_proc $N done } cp_restart_proc() { N=$1 cp_stop_proc $N #sleep 1 cp_start_proc $N } cp_restart() { for N in `seq 1 $PROCESSES`; do cp_restart_proc $N done } case "$1" in "start") cp_start ;; "stop") cp_stop ;; "restart") cp_restart ;; *) "$@" ;; esac From the bash script, we can essentially do 3 things: start the cherrypy server by calling ./cherrypy_server.sh start stop the cherrypy server by calling ./cherrypy_server.sh stop restart the cherrypy server by calling ./cherrypy_server.sh restart How would I place this shell script under systemd's control as a cherrypy.service file (with the obvious goal of having systemd start up the cherrypy server when a machine has been rebooted)? Reference systemd service file example here - https://wiki.archlinux.org/index.php/Systemd#Using_service_file

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• Speakers silent, headphones work in Ubuntu 9.04

  - by CarlF

  I'm running Ubuntu 9.04. Worked fine for months, then I rebooted yesterday after weeks of continuous operation. Now audio won't play through the speakers. The USB headset works fine, but the Conexant audio (CX20549) does not. Weirdly, it thinks it's playing. pavumeter shows appropriate levels, volume looks OK in alsamixer, but no sound. I did find this page: http://www.eugeneteplitsky.com/fixing-silent-pulseaudio-in-ubuntu-9-04/ Unfortunately the advice there doesn't help me. For one thing, the syntax for the alsa-base.conf file is apparently not actually documented anywhere. For another, my chipset isn't listed in the kernel.org docs he links to! EDIT: would upgrading to 9.10 help? Is there a major change in the audio subsystem between 9.04 and 9.10? Any suggestions? EDIT 2: This is stranger than I thought. Sound works normally in Xine, but is silent in Audacity, VLC and mplayer. What the?

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• How do I use a Minitel terminal as a linux dumb terminal

  - by Pawz

  I recently purchased a US version of the Alcatel Minitel terminal. I think it's a 1B version. Pictures of it here: I tried connecting a null modem to the 25 pin port on the back and plugging it into a linux box running agetty but I couldn't get it to show any signs of being connected. I used Google Translate to translate this document into English: http://mirabellug.org/wikini/upload/Documentations_minitel.pdf As far as I can tell, you take it out of videotex mode by typing Fcnt-T A, then turn off local echo with Fcnt-T E, then set it to 4800 baud with Fcnt-P 4. I presume Fcnt refers to the "CTRL" key on my terminal. But I think I'm doing something wrong, because it doesn't look like it's recognising the keystrokes, because "Fcnt-T A" just prints the letter A to the screen, which is not what you'd expect a function key combo to do. Has anyone used these minitel terminals as a linux terminal, and if so, please can you share how to configure the minitel to run as a terminal ? Is the 25 pin plug even the correct port to use ? I read something online that indicated you're supposed to use the 5 pin DIN plug instead, is that right ? If so, what's the 25 pin plug for ? If I am supposed to use the DIN plug, does anyone know the pinouts so I can make a cable ?

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• Postfix spool on ext3 optimiziations in >=linux-2.6.34 days

  - by Luke404

  Given the very specific nature of the subject (we're not talking about mailboxes, just the spool; we're not talking about other filesystems, just ext3; and so on...) and the maturity of the softwares involved (linux kernel, ext3fs, postfix) I'd think there should be a more or less agreed on set of best practices to filesystem related tuning. I'm trying to get a roundup of them: data=journal became the default in recent kernels (somewhere around 2.6.30 IIRC) so we should be ok with that Wietse Venema says atime must be on, but Postfix documentation recommendsnoatime while talking about the Incoming Queue. Does that mean that postfix needs atime on just for some queue directories and will benefit from noatime on the others? can we use noatime if we just don't use ETRN? filesystem can be mounted nodev,noexec,nosuid - no* won't prevent you from setting attributes (postfix uses exec attr) they just won't have any effect (we don't run anything from the spool) the fsync() issue cited by Wietse and/or the chattr -S are probably linked to sync/async options of ext3fs but I do not understand them enough. Mouting the filesystem with async option is equivalent to chattr -R -S the whole fs? Seems like it will increase performance, but will that pose a risk of "loss of mail after a system crash" or is it really "safe on /var/spool/postfix" ? would you tune anything else on postfix-2.6.x to work better on ext3 or do you leave defaults everywhere? is there a "best" linux I/O scheduler for this kind of workload (namely CFQ or deadline?) or that's something that will vary too much based on hardware configuration? would you tune anything else in the filesystem or in the kernel? anything else? References: Postfix Performance here on SF Postfix documentation about the Incoming Queue Wietse Venema in Best file system on postfix-users@postfix.org here Postfix and ext3 on [email protected] here and there

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• nginx error page and internal directives not working as expected

  - by Romain

  I'd like to setup my nginx server to return a specific error page on HTTP 50x status codes, and I'd like this page to be unavailable by a direct request from users (e.g., http//mysite/internalerror). For that, I'm using nginx's internal directive, but I must be missing something, as when I put that directive on my /internalerror location, nginx returns a custom 404 error (which isn't even my own 404 error page) when a page crashes. So, to summarize, here's what seems to happen: GET /Home nginx passes the query to Python I'm simulating an application bug to get the 502 error code nginx tries to return /InternalError from its error_page rule because of the internal rule, it finally fails back to a custom 404 error code <-- why? the documentation says error_page directives are not concerned by internal: http://wiki.nginx.org/HttpCoreModule#internal Here's an extract from nginx.conf with a few comments to point things out: error_page 404 /NotFound; error_page 500 502 503 504 =500 /InternalError; # HTTP 500 Error page declaration location / { try_files /Maintenance.html $uri @pythonbackend; } location @pythonbackend { include uwsgi_params; uwsgi_pass unix:///tmp/uwsgi.sock; } location ~* \.(py|pyc)$ { # This internal location works OK and returns my own 404 error page internal; } location /__Maintenance.html { # This one also works fine internal; } location ~* /internalerror { # This one doesn't work and returns nginx's 404 error page when I trigger an error somewhere on my site internal; } Thanks very much for your help!!

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• Fixed and dynamic IPs in ISC DHPD lead to double lease

  - by GorillaPatch

  I would like to have a small dynamic adress part and the most clients are assigned a fixed IP adress. My dhcpd.conf looks like this: use-host-decl-names on; authoritative; allow client-updates; ddns-updates on; # Einstellungen fuer DHCP leases default-lease-time 3600; max-lease-time 86400; lease-file-name "/var/lib/dhcpd/dhcpd.leases"; subnet 192.168.11.0 netmask 255.255.255.0 { ddns-updates on; pool { # IP range which will be assigned statically range 192.168.11.1 192.168.11.240; deny all clients; } pool { # small dynamic range range 192.168.11.241 192.168.11.254; # used for temporary devices } } group { host pc1 { hardware ethernet xx:xx:xx:xx:xx:xx; fixed-address 192.168.11.11; } } The motivation for the pool declaration with deny all hosts comes from the ISC DHCPD homepage http://www.isc.org/files/auth.html This will allow hosts to be first added to the network, where they will receive a temporary IP from the 241-254 adress range and then later write an explicit host declaration. Upon next connect it will receive the right configuration. The problem is that I am getting error messages that 192.168.11.13 has a dynamic and a static lease. I am a bit confused as I expected the pool declaration with deny all clients would not count as dynamic. Dynamic and static leases present for 192.168.11.13. Remove host declaration pc1 or remove 192.168.11.13 from the dynamic address pool for 192.168.11.0/24 Is there a way to have the DHCP server send an DHCPNA to clients if they have a host statement and retain this dynamic range?

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• OpenVZ with brdiged interfaces and VLAN

  - by Deimosfr

  Hi, I've got a problem with OpenVZ with brdiged VLAN. Here is my configuration : +------+ +-------+ +-----------+ +---------+ br0 |VE101 | | | | OpenBSD |----->| Debian |------->| | | WAN |--->| Router | | OpenVZ | +------+ | | | Firewall |----->| br0 br1 | br1 +------+ +-------+ +-----------+ +---------+------->|VE102 | |br0 | | |VLAN br0.110 +------+ v +---------+ |VE103.110| +---------+ I can't make VLAN working on br0 (br0.110) and I would like to understand why. I don't have any switch so no problem with unmanageable switch. I've configured a VLAN interface on OpenBSD in /etc/hostname.vlan110 : inet 192.168.110.254 255.255.255.0 NONE vlan 110 vlandev sis1 And it seams working fine. I've also adapted my PF configuration to work with VLAN but I don't see any incoming traffic. On my Debian lenny, here is my interfaces configuration : # The loopback network interface auto lo iface lo inet loopback # br0 auto br0 iface br0 inet static address 192.168.100.1 netmask 255.255.255.0 gateway 192.168.100.254 network 192.168.100.0 broadcast 192.168.100.255 bridge_ports eth0 bridge_fd 9 bridge_hello 2 bridge_maxage 12 bridge_stp off # VLAN 110 auto br0.110 iface br0.110 inet static address 192.168.110.1 netmask 255.255.255.0 network 192.168.110.0 gateway 192.168.110.254 broadcast 192.168.110.255 pre-up vconfig add br0 110 post-down vconfig rem br0.110 It looks like ok, but when I start my VE, here is the message : ... Configure veth devices: veth103.0 Adding interface veth103.0 to bridge br0.110 on CT0 for VE103 can't add veth103.0 to bridge br0.110: Operation not supported VE start in progress... So I've got one error here. I've followed this documentation http://wiki.openvz.org/VLAN but it doesn't work. I've certainly missed something but I don't know why. Someone could help me please ? Thanks

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• Munin graphing by CGI

  - by Vaughn Hawk

  I have Munin working just fine, but any time I try to do cgi graphing - it just stops graphing... no errors in the log, nothing. I've followed the instructions here: http://munin-monitoring.org/wiki/CgiHowto - and it should be working - here's my munin.conf setup, at least the parts that matter: dbdir /var/lib/munin htmldir /var/www/munin logdir /var/log/munin rundir /var/run/munin tmpldir /etc/munin/templates graph_strategy cgi cgiurl /usr/lib/cgi-bin cgiurl_graph /cgi-bin/munin-cgi-graph And then the host info yada yada - graph_strategy cgi and cgrurl are commented out in munin.conf - that's because if I uncomment them, graphing stops working. Again, I get no errors in logs, just blank images where the graphs used to be. Comment out cgi? As soon as munin html runs again, everything is back to normal. I'm running the latest version of munin and munin-node - I've tried fastcgi and regular cgi - permissions for all of the directories involved are munin:www-data - and my httpd.conf file looks like this: ScriptAlias /cgi-bin/ /usr/lib/cgi-bin/ <Directory /usr/lib/cgi-bin/> AllowOverride None SetHandler fastcgi-script Options ExecCGI -MultiViews +SymLinksIfOwnerMatch Order allow,deny Allow from all </Directory> <Location /cgi-bin/munin-cgi-graph> SetHandler fastcgi-script </Location> Does anyone have any ideas? Without this working, at least from what I understand, Munin just graphs stuff, even if no one is looking at them - you add 100 servers to graph, and this starts to become a problem. Hope someone has ran into this and can help me out. Thanks!

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• Access keystore on Sun ONE Webserver 6.1 for 2048 bit key length SSL

  - by George Bailey

  We want to get 2048 bit key length CSR requests. The browser based GUI provides us with a 1024 bit CSR and I don't know how to change that. It seems that 1024 bit key lengths will no longer supported by SSL companies. (Lower cost options only support 2048 bit. Thawte who is much more expensive say they accept 1024 for only one or two year certificates, but not 3). The legacy systems in question are running Sun ONE Webserver 6.1. Upgrading would be time consuming and we would rather not have to do that right now. We will be phasing these out but it will take awhile, so... Got it!! http://middlewarekb.wordpress.com/2010/06/30/how-to-generate-2048-bit-keypair-using-sun-one-or-iplanet-6-1-servers/ It is for the same version webserver I am using. /opt/SUNWwbsvr/bin/https/admin/bin/certutil -R -s "CN=sub.domain.ext,OU=org unit,O=company name,L=city,ST=spelled state,C=US,E=email" -a -k rsa -g 2048 -v 12 -d /opt/SUNWwbsvr/alias -P https-sub.domain.ext-hostname- -Z SHA1 Previous efforts edited out.

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• Network to network VPN Centos 5

  - by Atul Kulkarni

  I am trying to follow "http://www.centos.org/docs/5/html/Deployment_Guide-en-US/ch-vpn.html#s1-ipsec-net2net" I have come up with the following On local router machine: in my ifcfg-ipsec0: ONBOOT=yes IKE_METHOD=PSK DSTGW=10.5.27.1 SRCGW=10.6.159.1 DSTNET=10.5.27.0/25 SRCNET=10.6.159.0/24 DST=205.X.X.X TYPE=IPSEC I have /etc/sysconfig/network-scripts/keys-ipsec0 file in place. On Remote Machine in the cloud if have /etc/sysconfig/network-scripts/ifcfg-ipsec1: TYPE=IPSEC ONBOOT=yes IKE_METHOD=PSK SRCGW=10.5.27.1 DSTGW=10.6.159.1 SRCNET=10.5.27.124/25 DSTNET=10.6.159.0/24 DST=38.x.x.x with its respective /etc/sysconfig/network-scripts/key-ipsec1 file. The DST in both cases are NAT'd external IPs. Is that a problem? I have made changes for port forwarding as well. When I try to bring the interfaces up it gives me output "RTNETLINK answers: Invalid argument". I am confused now and don't know what more to do? Any place I can digup what parameters were wrong? I really appreciate any help I can get. Thanks and Regards, Atul.

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• iptables-restore: line 1 failed

  - by Doug

  Hello, I am new to servers, and I was following this guide and it failed on the first command instructed. Could anyone give me a hand? http://wiki.debian.org/iptables ~ZORO~:/etc# iptables-restore < /etc/iptables.test.rules iptables-restore: line 1 failed Edit: iptables.test.rules ~ZORO~:/etc# cat /etc/iptables.test.rules *filter # Allows all loopback (lo0) traffic and drop all traffic to 127/8 that doesn't use lo0 -A INPUT -i lo -j ACCEPT -A INPUT -i ! lo -d 127.0.0.0/8 -j REJECT # Accepts all established inbound connections -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT # Allows all outbound traffic # You could modify this to only allow certain traffic -A OUTPUT -j ACCEPT # Allows HTTP and HTTPS connections from anywhere (the normal ports for websites) -A INPUT -p tcp --dport 80 -j ACCEPT -A INPUT -p tcp --dport 443 -j ACCEPT # Allows SSH connections for script kiddies # THE -dport NUMBER IS THE SAME ONE YOU SET UP IN THE SSHD_CONFIG FILE -A INPUT -p tcp -m state --state NEW --dport 30000 -j ACCEPT # Now you should read up on iptables rules and consider whether ssh access # for everyone is really desired. Most likely you will only allow access from certain IPs. # Allow ping -A INPUT -p icmp -m icmp --icmp-type 8 -j ACCEPT # log iptables denied calls (access via 'dmesg' command) -A INPUT -m limit --limit 5/min -j LOG --log-prefix "iptables denied: " --log-level 7 # Reject all other inbound - default deny unless explicitly allowed policy: -A INPUT -j REJECT -A FORWARD -j REJECT COMMIT

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• Performance: Nginx SSL slowness or just SSL slowness in general?

  - by Mauvis Ledford

  I have an Amazon Web Services setup with an Apache instance behind Nginx with Nginx handling SSL and serving everything but the .php pages. In my ApacheBench tests I'm seeing this for my most expensive API call (which cache via Memcached): 100 concurrent calls to API call (http): 115ms (median) 260ms (max) 100 concurrent calls to API call (https): 6.1s (median) 11.9s (max) I've done a bit of research, disabled the most expensive SSL ciphers and enabled SSL caching (I know it doesn't help in this particular test.) Can you tell me why my SSL is taking so long? I've set up a massive EC2 server with 8CPUs and even applying consistent load to it only brings it up to 50% total CPU. I have 8 Nginx workers set and a bunch of Apache. Currently this whole setup is on one EC2 box but I plan to split it up and load balance it. There have been a few questions on this topic but none of those answers (disable expensive ciphers, cache ssl, seem to do anything.) Sample results below: $ ab -k -n 100 -c 100 https://URL This is ApacheBench, Version 2.3 <$Revision: 655654 $> Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/ Licensed to The Apache Software Foundation, http://www.apache.org/ Benchmarking URL.com (be patient).....done Server Software: nginx/1.0.15 Server Hostname: URL.com Server Port: 443 SSL/TLS Protocol: TLSv1/SSLv3,AES256-SHA,2048,256 Document Path: /PATH Document Length: 73142 bytes Concurrency Level: 100 Time taken for tests: 12.204 seconds Complete requests: 100 Failed requests: 0 Write errors: 0 Keep-Alive requests: 0 Total transferred: 7351097 bytes HTML transferred: 7314200 bytes Requests per second: 8.19 [#/sec] (mean) Time per request: 12203.589 [ms] (mean) Time per request: 122.036 [ms] (mean, across all concurrent requests) Transfer rate: 588.25 [Kbytes/sec] received Connection Times (ms) min mean[+/-sd] median max Connect: 65 168 64.1 162 268 Processing: 385 6096 3438.6 6199 11928 Waiting: 379 6091 3438.5 6194 11923 Total: 449 6264 3476.4 6323 12196 Percentage of the requests served within a certain time (ms) 50% 6323 66% 8244 75% 9321 80% 9919 90% 11119 95% 11720 98% 12076 99% 12196 100% 12196 (longest request)

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• VSFTPD - FTP over TLS - Upload stops after exactly 82k?

  - by Redsandro

  I installed a VSFTP daemon on a CentOS server, using a RSA certificate for logging in using explicit TLS. Now, I cannot upload more than 82k. With files under that limit, there is no problem. The FTP works like a charm. But as soon as a file reaches 82k with FileZilla (81,952 bytes to be exact), the transfer will stop, and the FTP client hangs until time out is reached. FTP client console: 15:10:21 Command: STOR jquery-1.7.2.min.js 15:10:21 Response: 150 Ok to send data. 15:11:21 Error: Connection timed out 15:11:21 Error: File transfer failed after transferring 82 KB in 60 seconds /var/log/vsftpd.log FTP command: Client "x.x.x.x", "STOR jquery-1.7.2.min.js" FTP response: Client "x.x.x.x", "150 Ok to send data." OK UPLOAD: Client "x.x.x.x", "jquery-1.7.2.min.js", 81952 bytes, 1.32Kbyte/sec FTP response: Client "x.x.x.x", "226 File receive OK." // NOT okay, file is bigger // No mention of error here I cannot find relevant info about this problem, apart from a possible problem with trans_chunk_size (not mentioned in default config), but I tried different sizes and it has no impact on the problem. trans_chunk_size=4096 trans_chunk_size=8192 trans_chunk_size=9999 Ofcourse, after every configuration change, I restarted the server: /etc/init.d/vsftpd restart What else can cause this? It's not the latest version, but it's the latest update within the repositories that has been deemed fit for enterprise usage: Package info: $ yum info vsftpd Loaded plugins: fastestmirror Installed Packages Name : vsftpd Arch : x86_64 Version : 2.0.5 Release : 24.el5_8.1 Size : 286 k Repo : installed Summary : vsftpd - Very Secure Ftp Daemon URL : http://vsftpd.beasts.org/ License : GPL Description: vsftpd is a Very Secure FTP daemon. It was written completely from scratch.

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• Websockets Server with Fault-Tolerance and Durable Message Store

  - by smitchell360

  I am starting to experiment with websockets. Does anyone know of a websockets server (open source or paid) that provides a durable store of the websocket "channel"? All of the examples that I have found do not address durability -- if a websockets server goes down, all "channel" data is lost. Services such as Pusher do not really discuss whether they address the durability issue (and I have not received a response from tech support yet). Happy to roll my own, but would rather not reinvent the wheel. EDIT: I'm not looking for websockets 101 information. That is readily available and understood. I'm looking for a server (open source or paid) that supports websockets and has a durable store for the websocket data so that, in the event that a server fails, a new server can take over where the original one left off. Two main purposes: 1. support failover scenarios contemplated by the websockets Network Working Group http://tools.ietf.org/html/draft-ibc-websocket-dns-srv-02#section-5.1 (most importantly so that missed messages are sent when a client connects to a failover server) 2. support scenarios where new subscribers must receive all past messages that were published. Of course this can be handled at the application layer...but that is not what I am looking for. EDIT So, after some research the following installed options seem to be the most robust: Kaazing Migratory Migratory (http://migratory.ro) Hosted services that seem "real" Pusher (great API but no history feature yet) PubNub (has history) All of the above services have graceful fallback to other communication methods if websockets are not available. I was not able to find any open source that provided "out of the box" clustering, fail-over, and a durable message store to play back history. There are some projects that may serve as good starting points, but not exactly what I am looking for.

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• How can I set the CD audio volume in Linux?

  - by user1296362

  In Windows 7 Control Panel - Sound - Sound Properties window there's an slider for setting CD Audio volume: And it's pretty strange that I can't find corresponding one in generic Linux mixers: alsamixer or amixer. I connected a CD drive to try to set CD audio volume with cdcd (CD Player): $ cdcd setvol 0 Invalid volume It isn't actually an invalid volume, it is because ioctl() call fails. I found that out after searching and changing a bit the source code of this utility (in the libcdaudio): --- cdaudio.c.orig 2004-09-09 06:26:20.000000000 +0600 +++ cdaudio.c 2012-05-30 21:34:34.167915521 +0600 @@ -578,8 +578,10 @@ cdvol_data.CDVOLCTRL_BACK_RIGHT_SELECT = CDAUDIO_MAX_VOLUME; #endif - if(ioctl(cd_desc, CDAUDIO_SET_VOLUME, &cdvol) < 0) - return -1; + if(ioctl(cd_desc, CDAUDIO_SET_VOLUME, &cdvol) < 0) { + printf("*** cd_set_volume: ioctl() returned error\n"); + return -1; + } return 0; } By the way cdcd's get volume command yields rather weird output: Left Right Front 1281734864 32767 Back 0 0 Also I tried aumix: $ aumix -c 0 But all with no success. I read from this manual — http://tldp.org/HOWTO/Alsa-sound-6.html (section 6.2 The mixer) that CD channel can present in amixer output. Maybe some drivers for sound card are missing in my Ubuntu 12.04 LTS installation. Though I don't think it's the case: $ lsmod | grep snd snd_mixer_oss 22602 0 snd_hda_codec_hdmi 32474 1 snd_hda_codec_realtek 223867 1 snd_hda_intel 33773 4 snd_hda_codec 127706 3 snd_hda_codec_hdmi,snd_hda_codec_realtek,snd_hda_intel snd_hwdep 13668 1 snd_hda_codec snd_pcm 97188 3 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec snd_seq_midi 13324 0 snd_rawmidi 30748 1 snd_seq_midi snd_seq_midi_event 14899 1 snd_seq_midi snd_seq 61896 2 snd_seq_midi,snd_seq_midi_event snd_timer 29990 2 snd_pcm,snd_seq snd_seq_device 14540 3 snd_seq_midi,snd_rawmidi,snd_seq snd 78855 19 snd_mixer_oss,snd_hda_codec_hdmi,snd_hda_codec_realtek,snd_hda_intel,snd_hda_codec,snd_hwdep ,snd_pcm,snd_rawmidi,snd_seq,snd_timer,snd_seq_device soundcore 15091 1 snd snd_page_alloc 18529 2 snd_hda_intel,snd_pcm All I need is just mute or set to 0 volume level of CD Audio channel, like I did in Windows 7, to get rid of sibilant noise in the speakers.

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• Almost every Inkscape extension yields an error in Mac OS X

  - by andyvn22

  I've run the latest few versions of Inkscape (currently landed on "0.47+devel"), and have been having trouble with the Extensions menu. So far, in every version of Inkscape I've tried, nearly every extension yields the following error: The fantastic lxml wrapper for libxml2 is required by inkex.py and therefore this extension. Please download and install the latest version from http://cheeseshop.python.org/pypi/lxml/, or install it through your package manager by a command like: sudo apt-get install python-lxml I've tried the instructions listed there, of course, with no effect. I've also found many references to this issue on fora, in bug trackers, etc., and as such also tried: sudo easy_install lxml cd /Applications/Inkscape.app/Contents/Resources/lib mv libxml2.2.dylib libxml2.2.dylib.old ln -s /usr/lib/libxml2.dylib and a few similar solutions. Nothing has produced any change in Inkscape's behavior. Does anyone know A) what's really going on here? Because from what I gather the error is not describing the actual problem. And of course B) a simple solution? I need those features! :)

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• Recover NTFS data from a ZFS pool that was exposed as an iSCSI target

  - by David

  This was me being stupid and the data is by no means critical and is now a learning experience first, time saver second. I set up a 100GB iSCSI target via the bare bone instructions in napp-it. It's a volume LU. I then had my Windows 7 machine connect to the iSCSI target, formatted it to NTFS, and tested the performance of it with some large iso file transfers. I then unmapped the drive, reconnected to the target, and was forced to format to NTFS again. It was then I realized the files I had transferred only existed on the iSCSI target. I threw a little fit and then went about my business. When I was cleaning up my experiment I noticed in this screen: http://imgur.com/1xlcu.jpg That is my experimental target tank/iSCSI and it still has a lot of data in it. Assuming my isos are still in this pool how would I go about recovering them? While writing this I used GetDataBackup for NTFS from www.runtime.org. And while it found two previous NTFS partitions there was no data.

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• Configuring three monitors with two Radeon X1600/X1650 graphics cards under Ubuntu

  - by cpm

  I have three SyncMaster 932a monitors I want to use with two Radeon X1600/X1650 cards under Linux. I am running X.org X Server 1.6.0, as provided by Ubuntu's Wubi installer. After turning off mirroring, I ended up with this xorg.conf: Section "Monitor" Identifier "Configured Monitor" EndSection Section "Screen" Identifier "Default Screen" Monitor "Configured Monitor" Device "Configured Video Device" SubSection "Display" Virtual 2560 1024 EndSubSection EndSection Section "Device" Identifier "Configured Video Device" EndSection The left monitor had a menu bar and a task bar, the center monitor was just desktop, and windows would maximize to the current monitor. The third monitor and second graphics card weren't being used at all. Then I changed my configuration to manually specify each card with their PCI bus: Section "ServerLayout" Identifier "TheLayout" Screen 0 "Radeon Screen 1" Screen 1 "Radeon Screen 2" RightOf "Radeon Screen 1" EndSection Section "Screen" Identifier "Radeon Screen 1" Monitor "Configured Monitor" Device "Radeon the First" SubSection "Display" Virtual 2560 1024 EndSubSection EndSection Section "Screen" Identifier "Radeon Screen 2" Monitor "Configured Monitor" Device "Radeon the Second" EndSection Section "Device" Identifier "Radeon the First" Driver "radeon" BusID "PCI:1:0:0" EndSection Section "Device" Identifier "Radeon the Second" Driver "radeon" BusID "PCI:2:0:0" EndSection Section "Monitor" Identifier "Configured Monitor" EndSection Now both the left and right monitors have task bars and menu bars. Windows cannot be dragged from the first two monitors to the third monitor. Also, maximizing in the left or center window fills both monitors. I also tried adding Option "Xinerama" "true" to the ServerLayout section. X11 wasn't able to start up. I want to: Allow moving windows along all three monitors. Maximizing only fills the current monitor. Either have menu/task bars on only the left monitor or all three monitors How can I make this possible?

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• Installing Windows 7 from USB on a Thinkpad T61

  - by Halik

  I am trying to install Windows 7 Professional from USB 3.0 flashdrive, on a Thinkpad T61. The problem is, Thinkpads BIOS will not detect the flash drive as bootable medium, and won't allow to boot from it. What I did: Enabled USB BIOS Support in BIOS (it was on by default) In startup menu, added USB HDD to boot order (it has '-' sign in front of it) Created Windows 7 install media with UNetbootin, WinUSB (linux tool) dd and Grub4DOS. As you can tell, currently, I only have access to Linux machine to make the flashdrive. What happens: The T61 BIOS shows '-USB HDD' in boot order menu. The '-' sign suggests that the plugged flash drive is currently not bootable. The same flashdrive (with the same Windows image on it) is booting without any problems on a Dell D430 and Lenovo Y550. Also, Ubuntu 12.04 install USB created with Unetbootin shows as bootable ('+' sign in BIOS boot order menu) and boots from the F12 boot menu. Additional info thinkwiki.org says that some Thinkpad BIOSes do not use MBR on flashdrives. It suggests using Extended-IPL boot loader, but the provided links are broken and there seems to be no mirrors. Solution: http://superuser.com/a/430186/54970

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• JBossMQ - Clustered Queues/NameNotFoundException: QueueConnectionFactory error

  - by mfarver

  I am trying to get an application working on a JBoss Cluster. It uses Queues internally, and the developer claims that it should work correctly in a clustered environment. I have jbossmq setup as a ha-singleton on the cluster. The application works correctly on whichever node currently is running the queue, but fails on the other nodes with a: "javax.naming.NameNotFoundException: QueueConnectionFactory not bound" error. I can look at JNDIview from the jmx-console and see that indeed the QueueConnectionFactory class only appears on the primary node in the Global context. Is there a way to see the Cluster's JNDI listing instead of each server? The steps I took from a default Jboss 4.2.3.GA installation were to use the "all" configuration. Then removed /server/all/deploy/hsqldb-ds.xml and /deploy-hasingleton/jms/hsqldb-jdbc2-service.xml, copying the example/jms/mysq-jdbc2-service.xml file into its place (editing that file to use DefaultDS instead of MySqlDS). Finally I created a mysql-ds.xml file in the deploy directory pointing "DefaultDS" at an empty database. I created a -services.xml file in the deploy directory with the queue definition. like the one below: <server> <mbean code="org.jboss.mq.server.jmx.Queue" name="jboss.mq.destination:service=Queue,name=myfirstqueue"> <depends optional-attribute-name="DestinationManager"> jboss.mq:service=DestinationManager </depends> </mbean> </server> All of the other cluster features of working, the servers list each other in the view, and sessions are replicating back and forth. The JBoss documentation is somewhat light in this area, is there another setting I might have missed? Or is this likely to be a code issue (is there different code to do a JNDI lookup in a clusted environment?) Thanks

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• Windows Server NTFS volume list file name encodings and any illegal file names

  - by benbradley

  I'm having to deal with a Windows Server (NTFS) file server and our backup application appears to be failing with certain files. According to this https://en.wikipedia.org/wiki/NTFS#Internals NTFS apparently supports file names encoded in UTF-16 but according to their support team, our backup application only supports UTF-8. I'd like to confirm whether this is actually the problem by seeing the file name encoding for myself. The files that are failing appear to be using plain English A-Z letters and other ASCII characters. No accents or non-English letters etc. I suppose even though the letters appear to be plain A-Z the file name could still be encoded in UTF-16. Does anyone know of a utility or script that can recursively go through all files in a directory and show the encoding of the file name? Then I could try renaming to UTF-8 to see if the backup can proceed. I'm not a Windows developer so can't write this up myself. Presumably the encoding of the file name should be stored in the FS somewhere and therefore it should be possible to expose this.

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• Not able to run firefox in a head-less Ubuntu server 9.10

  - by Julio J.

  I need to run Firefox in my server in order to execute some Selenium tests from Hudson. I would love no to have to install a complete gui. So I installed Xvfb in order to fake the Gui (I understand it this way correct me if my assumptions are wrong). After some time trying to make it work, I'm stuck with the next situation: $ sudo Xvfb -ac :99 & [dix] Could not init font path element /var/lib/defoma/x-ttcidfont-conf.d/dirs/TrueType, removing from list! (EE) config/hal: NewInputDeviceRequest failed (2) (EE) config/hal: NewInputDeviceRequest failed (2) (EE) config/hal: NewInputDeviceRequest failed (2) (EE) config/hal: NewInputDeviceRequest failed (2) (EE) config/hal: NewInputDeviceRequest failed (2) $ firefox [dix] Could not init font path element /var/lib/defoma/x-ttcidfont-conf.d/dirs/TrueType, removing from list! [config/dbus] couldn't register object path (EE) config/hal: NewInputDeviceRequest failed (2) (EE) config/hal: NewInputDeviceRequest failed (2) (EE) config/hal: NewInputDeviceRequest failed (2) (EE) config/hal: NewInputDeviceRequest failed (2) (EE) config/hal: NewInputDeviceRequest failed (2) Xlib: extension "RANDR" missing on display ":99.0". GConf Error: Failed to contact configuration server; some possible causes are that you need to enable TCP/IP networking for ORBit, or you have stale NFS locks due to a system crash. See http://projects.gnome.org/gconf/ for information. (Details - 1: Failed to get connection to session: /bin/dbus-launch terminated abnormally without any error message) I'm runnig firefox without installing it from the repositories. And I'm getting a socket timeout when I try to run the selenium tests, so I guess the problem is in Firefox and Xvfb. I have installed already the nex package: i gconf-defaults-service - GNOME configuration database system (system defaults service) That in some forums suggest to be a fix, that in my case doesn't work. Any explanation about the problem and ways of solving it without installing a full gui, will be very helpful.

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• can't connect to vsftpd from outside network

  - by rick

  i know this has been asked many times before, but nothing seems to resolve my issue. i have vsftpd running on ubuntu 10.04. i can connect with ftp localhost on the machine. i can connect from another machine in my network. i just cannot connect from outside. the machine is behind an airport extreme managed by airport utility on a mac. 21 is open as per nmap: macmini:~$ nmap localhost Starting Nmap 5.21 ( http://nmap.org ) at 2011-04-10 23:49 EDT Nmap scan report for localhost (127.0.0.1) Host is up (0.00045s latency). Hostname localhost resolves to 2 IPs. Only scanned 127.0.0.1 rDNS record for 127.0.0.1: localhost.localdomain Not shown: 997 closed ports PORT STATE SERVICE 21/tcp open ftp 22/tcp open ssh 631/tcp open ipp netstat says 21 is listening: macmini:~$ netstat -lep --tcp | grep ftp (Not all processes could be identified, non-owned process info will not be shown, you would have to be root to see it all.) tcp 0 0 *:ftp *:* LISTEN iptables: macmini:~$ sudo iptables -L Chain INPUT (policy ACCEPT) target prot opt source destination Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination when i try to connect from my external IP (or a dyndns name which resolves there) it times out. ("control connection timed out") as i know very little about networking, i feel like something may jump out as clearly wrong?

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